File: krb5.hin

package info (click to toggle)
krb5 1.17-6
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 55,116 kB
  • sloc: ansic: 303,225; exp: 13,198; cpp: 9,731; python: 8,927; makefile: 7,178; sh: 6,279; perl: 2,289; asm: 1,460; yacc: 1,005; awk: 396; csh: 147; xml: 135; lisp: 104; sed: 41
file content (8589 lines) | stat: -rw-r--r-- 317,511 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232
6233
6234
6235
6236
6237
6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
6329
6330
6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
6383
6384
6385
6386
6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
6499
6500
6501
6502
6503
6504
6505
6506
6507
6508
6509
6510
6511
6512
6513
6514
6515
6516
6517
6518
6519
6520
6521
6522
6523
6524
6525
6526
6527
6528
6529
6530
6531
6532
6533
6534
6535
6536
6537
6538
6539
6540
6541
6542
6543
6544
6545
6546
6547
6548
6549
6550
6551
6552
6553
6554
6555
6556
6557
6558
6559
6560
6561
6562
6563
6564
6565
6566
6567
6568
6569
6570
6571
6572
6573
6574
6575
6576
6577
6578
6579
6580
6581
6582
6583
6584
6585
6586
6587
6588
6589
6590
6591
6592
6593
6594
6595
6596
6597
6598
6599
6600
6601
6602
6603
6604
6605
6606
6607
6608
6609
6610
6611
6612
6613
6614
6615
6616
6617
6618
6619
6620
6621
6622
6623
6624
6625
6626
6627
6628
6629
6630
6631
6632
6633
6634
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647
6648
6649
6650
6651
6652
6653
6654
6655
6656
6657
6658
6659
6660
6661
6662
6663
6664
6665
6666
6667
6668
6669
6670
6671
6672
6673
6674
6675
6676
6677
6678
6679
6680
6681
6682
6683
6684
6685
6686
6687
6688
6689
6690
6691
6692
6693
6694
6695
6696
6697
6698
6699
6700
6701
6702
6703
6704
6705
6706
6707
6708
6709
6710
6711
6712
6713
6714
6715
6716
6717
6718
6719
6720
6721
6722
6723
6724
6725
6726
6727
6728
6729
6730
6731
6732
6733
6734
6735
6736
6737
6738
6739
6740
6741
6742
6743
6744
6745
6746
6747
6748
6749
6750
6751
6752
6753
6754
6755
6756
6757
6758
6759
6760
6761
6762
6763
6764
6765
6766
6767
6768
6769
6770
6771
6772
6773
6774
6775
6776
6777
6778
6779
6780
6781
6782
6783
6784
6785
6786
6787
6788
6789
6790
6791
6792
6793
6794
6795
6796
6797
6798
6799
6800
6801
6802
6803
6804
6805
6806
6807
6808
6809
6810
6811
6812
6813
6814
6815
6816
6817
6818
6819
6820
6821
6822
6823
6824
6825
6826
6827
6828
6829
6830
6831
6832
6833
6834
6835
6836
6837
6838
6839
6840
6841
6842
6843
6844
6845
6846
6847
6848
6849
6850
6851
6852
6853
6854
6855
6856
6857
6858
6859
6860
6861
6862
6863
6864
6865
6866
6867
6868
6869
6870
6871
6872
6873
6874
6875
6876
6877
6878
6879
6880
6881
6882
6883
6884
6885
6886
6887
6888
6889
6890
6891
6892
6893
6894
6895
6896
6897
6898
6899
6900
6901
6902
6903
6904
6905
6906
6907
6908
6909
6910
6911
6912
6913
6914
6915
6916
6917
6918
6919
6920
6921
6922
6923
6924
6925
6926
6927
6928
6929
6930
6931
6932
6933
6934
6935
6936
6937
6938
6939
6940
6941
6942
6943
6944
6945
6946
6947
6948
6949
6950
6951
6952
6953
6954
6955
6956
6957
6958
6959
6960
6961
6962
6963
6964
6965
6966
6967
6968
6969
6970
6971
6972
6973
6974
6975
6976
6977
6978
6979
6980
6981
6982
6983
6984
6985
6986
6987
6988
6989
6990
6991
6992
6993
6994
6995
6996
6997
6998
6999
7000
7001
7002
7003
7004
7005
7006
7007
7008
7009
7010
7011
7012
7013
7014
7015
7016
7017
7018
7019
7020
7021
7022
7023
7024
7025
7026
7027
7028
7029
7030
7031
7032
7033
7034
7035
7036
7037
7038
7039
7040
7041
7042
7043
7044
7045
7046
7047
7048
7049
7050
7051
7052
7053
7054
7055
7056
7057
7058
7059
7060
7061
7062
7063
7064
7065
7066
7067
7068
7069
7070
7071
7072
7073
7074
7075
7076
7077
7078
7079
7080
7081
7082
7083
7084
7085
7086
7087
7088
7089
7090
7091
7092
7093
7094
7095
7096
7097
7098
7099
7100
7101
7102
7103
7104
7105
7106
7107
7108
7109
7110
7111
7112
7113
7114
7115
7116
7117
7118
7119
7120
7121
7122
7123
7124
7125
7126
7127
7128
7129
7130
7131
7132
7133
7134
7135
7136
7137
7138
7139
7140
7141
7142
7143
7144
7145
7146
7147
7148
7149
7150
7151
7152
7153
7154
7155
7156
7157
7158
7159
7160
7161
7162
7163
7164
7165
7166
7167
7168
7169
7170
7171
7172
7173
7174
7175
7176
7177
7178
7179
7180
7181
7182
7183
7184
7185
7186
7187
7188
7189
7190
7191
7192
7193
7194
7195
7196
7197
7198
7199
7200
7201
7202
7203
7204
7205
7206
7207
7208
7209
7210
7211
7212
7213
7214
7215
7216
7217
7218
7219
7220
7221
7222
7223
7224
7225
7226
7227
7228
7229
7230
7231
7232
7233
7234
7235
7236
7237
7238
7239
7240
7241
7242
7243
7244
7245
7246
7247
7248
7249
7250
7251
7252
7253
7254
7255
7256
7257
7258
7259
7260
7261
7262
7263
7264
7265
7266
7267
7268
7269
7270
7271
7272
7273
7274
7275
7276
7277
7278
7279
7280
7281
7282
7283
7284
7285
7286
7287
7288
7289
7290
7291
7292
7293
7294
7295
7296
7297
7298
7299
7300
7301
7302
7303
7304
7305
7306
7307
7308
7309
7310
7311
7312
7313
7314
7315
7316
7317
7318
7319
7320
7321
7322
7323
7324
7325
7326
7327
7328
7329
7330
7331
7332
7333
7334
7335
7336
7337
7338
7339
7340
7341
7342
7343
7344
7345
7346
7347
7348
7349
7350
7351
7352
7353
7354
7355
7356
7357
7358
7359
7360
7361
7362
7363
7364
7365
7366
7367
7368
7369
7370
7371
7372
7373
7374
7375
7376
7377
7378
7379
7380
7381
7382
7383
7384
7385
7386
7387
7388
7389
7390
7391
7392
7393
7394
7395
7396
7397
7398
7399
7400
7401
7402
7403
7404
7405
7406
7407
7408
7409
7410
7411
7412
7413
7414
7415
7416
7417
7418
7419
7420
7421
7422
7423
7424
7425
7426
7427
7428
7429
7430
7431
7432
7433
7434
7435
7436
7437
7438
7439
7440
7441
7442
7443
7444
7445
7446
7447
7448
7449
7450
7451
7452
7453
7454
7455
7456
7457
7458
7459
7460
7461
7462
7463
7464
7465
7466
7467
7468
7469
7470
7471
7472
7473
7474
7475
7476
7477
7478
7479
7480
7481
7482
7483
7484
7485
7486
7487
7488
7489
7490
7491
7492
7493
7494
7495
7496
7497
7498
7499
7500
7501
7502
7503
7504
7505
7506
7507
7508
7509
7510
7511
7512
7513
7514
7515
7516
7517
7518
7519
7520
7521
7522
7523
7524
7525
7526
7527
7528
7529
7530
7531
7532
7533
7534
7535
7536
7537
7538
7539
7540
7541
7542
7543
7544
7545
7546
7547
7548
7549
7550
7551
7552
7553
7554
7555
7556
7557
7558
7559
7560
7561
7562
7563
7564
7565
7566
7567
7568
7569
7570
7571
7572
7573
7574
7575
7576
7577
7578
7579
7580
7581
7582
7583
7584
7585
7586
7587
7588
7589
7590
7591
7592
7593
7594
7595
7596
7597
7598
7599
7600
7601
7602
7603
7604
7605
7606
7607
7608
7609
7610
7611
7612
7613
7614
7615
7616
7617
7618
7619
7620
7621
7622
7623
7624
7625
7626
7627
7628
7629
7630
7631
7632
7633
7634
7635
7636
7637
7638
7639
7640
7641
7642
7643
7644
7645
7646
7647
7648
7649
7650
7651
7652
7653
7654
7655
7656
7657
7658
7659
7660
7661
7662
7663
7664
7665
7666
7667
7668
7669
7670
7671
7672
7673
7674
7675
7676
7677
7678
7679
7680
7681
7682
7683
7684
7685
7686
7687
7688
7689
7690
7691
7692
7693
7694
7695
7696
7697
7698
7699
7700
7701
7702
7703
7704
7705
7706
7707
7708
7709
7710
7711
7712
7713
7714
7715
7716
7717
7718
7719
7720
7721
7722
7723
7724
7725
7726
7727
7728
7729
7730
7731
7732
7733
7734
7735
7736
7737
7738
7739
7740
7741
7742
7743
7744
7745
7746
7747
7748
7749
7750
7751
7752
7753
7754
7755
7756
7757
7758
7759
7760
7761
7762
7763
7764
7765
7766
7767
7768
7769
7770
7771
7772
7773
7774
7775
7776
7777
7778
7779
7780
7781
7782
7783
7784
7785
7786
7787
7788
7789
7790
7791
7792
7793
7794
7795
7796
7797
7798
7799
7800
7801
7802
7803
7804
7805
7806
7807
7808
7809
7810
7811
7812
7813
7814
7815
7816
7817
7818
7819
7820
7821
7822
7823
7824
7825
7826
7827
7828
7829
7830
7831
7832
7833
7834
7835
7836
7837
7838
7839
7840
7841
7842
7843
7844
7845
7846
7847
7848
7849
7850
7851
7852
7853
7854
7855
7856
7857
7858
7859
7860
7861
7862
7863
7864
7865
7866
7867
7868
7869
7870
7871
7872
7873
7874
7875
7876
7877
7878
7879
7880
7881
7882
7883
7884
7885
7886
7887
7888
7889
7890
7891
7892
7893
7894
7895
7896
7897
7898
7899
7900
7901
7902
7903
7904
7905
7906
7907
7908
7909
7910
7911
7912
7913
7914
7915
7916
7917
7918
7919
7920
7921
7922
7923
7924
7925
7926
7927
7928
7929
7930
7931
7932
7933
7934
7935
7936
7937
7938
7939
7940
7941
7942
7943
7944
7945
7946
7947
7948
7949
7950
7951
7952
7953
7954
7955
7956
7957
7958
7959
7960
7961
7962
7963
7964
7965
7966
7967
7968
7969
7970
7971
7972
7973
7974
7975
7976
7977
7978
7979
7980
7981
7982
7983
7984
7985
7986
7987
7988
7989
7990
7991
7992
7993
7994
7995
7996
7997
7998
7999
8000
8001
8002
8003
8004
8005
8006
8007
8008
8009
8010
8011
8012
8013
8014
8015
8016
8017
8018
8019
8020
8021
8022
8023
8024
8025
8026
8027
8028
8029
8030
8031
8032
8033
8034
8035
8036
8037
8038
8039
8040
8041
8042
8043
8044
8045
8046
8047
8048
8049
8050
8051
8052
8053
8054
8055
8056
8057
8058
8059
8060
8061
8062
8063
8064
8065
8066
8067
8068
8069
8070
8071
8072
8073
8074
8075
8076
8077
8078
8079
8080
8081
8082
8083
8084
8085
8086
8087
8088
8089
8090
8091
8092
8093
8094
8095
8096
8097
8098
8099
8100
8101
8102
8103
8104
8105
8106
8107
8108
8109
8110
8111
8112
8113
8114
8115
8116
8117
8118
8119
8120
8121
8122
8123
8124
8125
8126
8127
8128
8129
8130
8131
8132
8133
8134
8135
8136
8137
8138
8139
8140
8141
8142
8143
8144
8145
8146
8147
8148
8149
8150
8151
8152
8153
8154
8155
8156
8157
8158
8159
8160
8161
8162
8163
8164
8165
8166
8167
8168
8169
8170
8171
8172
8173
8174
8175
8176
8177
8178
8179
8180
8181
8182
8183
8184
8185
8186
8187
8188
8189
8190
8191
8192
8193
8194
8195
8196
8197
8198
8199
8200
8201
8202
8203
8204
8205
8206
8207
8208
8209
8210
8211
8212
8213
8214
8215
8216
8217
8218
8219
8220
8221
8222
8223
8224
8225
8226
8227
8228
8229
8230
8231
8232
8233
8234
8235
8236
8237
8238
8239
8240
8241
8242
8243
8244
8245
8246
8247
8248
8249
8250
8251
8252
8253
8254
8255
8256
8257
8258
8259
8260
8261
8262
8263
8264
8265
8266
8267
8268
8269
8270
8271
8272
8273
8274
8275
8276
8277
8278
8279
8280
8281
8282
8283
8284
8285
8286
8287
8288
8289
8290
8291
8292
8293
8294
8295
8296
8297
8298
8299
8300
8301
8302
8303
8304
8305
8306
8307
8308
8309
8310
8311
8312
8313
8314
8315
8316
8317
8318
8319
8320
8321
8322
8323
8324
8325
8326
8327
8328
8329
8330
8331
8332
8333
8334
8335
8336
8337
8338
8339
8340
8341
8342
8343
8344
8345
8346
8347
8348
8349
8350
8351
8352
8353
8354
8355
8356
8357
8358
8359
8360
8361
8362
8363
8364
8365
8366
8367
8368
8369
8370
8371
8372
8373
8374
8375
8376
8377
8378
8379
8380
8381
8382
8383
8384
8385
8386
8387
8388
8389
8390
8391
8392
8393
8394
8395
8396
8397
8398
8399
8400
8401
8402
8403
8404
8405
8406
8407
8408
8409
8410
8411
8412
8413
8414
8415
8416
8417
8418
8419
8420
8421
8422
8423
8424
8425
8426
8427
8428
8429
8430
8431
8432
8433
8434
8435
8436
8437
8438
8439
8440
8441
8442
8443
8444
8445
8446
8447
8448
8449
8450
8451
8452
8453
8454
8455
8456
8457
8458
8459
8460
8461
8462
8463
8464
8465
8466
8467
8468
8469
8470
8471
8472
8473
8474
8475
8476
8477
8478
8479
8480
8481
8482
8483
8484
8485
8486
8487
8488
8489
8490
8491
8492
8493
8494
8495
8496
8497
8498
8499
8500
8501
8502
8503
8504
8505
8506
8507
8508
8509
8510
8511
8512
8513
8514
8515
8516
8517
8518
8519
8520
8521
8522
8523
8524
8525
8526
8527
8528
8529
8530
8531
8532
8533
8534
8535
8536
8537
8538
8539
8540
8541
8542
8543
8544
8545
8546
8547
8548
8549
8550
8551
8552
8553
8554
8555
8556
8557
8558
8559
8560
8561
8562
8563
8564
8565
8566
8567
8568
8569
8570
8571
8572
8573
8574
8575
8576
8577
8578
8579
8580
8581
8582
8583
8584
8585
8586
8587
8588
8589
/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* General definitions for Kerberos version 5. */
/*
 * Copyright 1989, 1990, 1995, 2001, 2003, 2007, 2011 by the Massachusetts
 * Institute of Technology.  All Rights Reserved.
 *
 * Export of this software from the United States of America may
 *   require a specific license from the United States Government.
 *   It is the responsibility of any person or organization contemplating
 *   export to obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  Furthermore if you modify this software you must label
 * your software as modified software and not distribute it in such a
 * fashion that it might be confused with the original M.I.T. software.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 */
/*
 * Copyright (C) 1998 by the FundsXpress, INC.
 *
 * All rights reserved.
 *
 * Export of this software from the United States of America may require
 * a specific license from the United States Government.  It is the
 * responsibility of any person or organization contemplating export to
 * obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of FundsXpress. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  FundsXpress makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef KRB5_GENERAL__
#define KRB5_GENERAL__

/** @defgroup KRB5_H krb5 library API
 * @{
 */

 /* By default, do not expose deprecated interfaces. */
#ifndef KRB5_DEPRECATED
#define KRB5_DEPRECATED 0
#endif

#if defined(__MACH__) && defined(__APPLE__)
#       include <TargetConditionals.h>
#    if TARGET_RT_MAC_CFM
#       error "Use KfM 4.0 SDK headers for CFM compilation."
#    endif
#endif

#if defined(_MSDOS) || defined(_WIN32)
#include <win-mac.h>
#endif

#ifndef KRB5_CONFIG__
#ifndef KRB5_CALLCONV
#define KRB5_CALLCONV
#define KRB5_CALLCONV_C
#endif /* !KRB5_CALLCONV */
#endif /* !KRB5_CONFIG__ */

#ifndef KRB5_CALLCONV_WRONG
#define KRB5_CALLCONV_WRONG
#endif

#ifndef THREEPARAMOPEN
#define THREEPARAMOPEN(x,y,z) open(x,y,z)
#endif

#define KRB5_OLD_CRYPTO

#include <stdlib.h>
#include <limits.h>             /* for *_MAX */
#include <stdarg.h>
#include <stdint.h>

#ifndef KRB5INT_BEGIN_DECLS
#if defined(__cplusplus)
#define KRB5INT_BEGIN_DECLS     extern "C" {
#define KRB5INT_END_DECLS       }
#else
#define KRB5INT_BEGIN_DECLS
#define KRB5INT_END_DECLS
#endif
#endif

KRB5INT_BEGIN_DECLS

#if defined(TARGET_OS_MAC) && TARGET_OS_MAC
#    pragma pack(push,2)
#endif

#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= 30203
# define KRB5_ATTR_DEPRECATED __attribute__((deprecated))
#elif defined _WIN32
# define KRB5_ATTR_DEPRECATED __declspec(deprecated)
#else
# define KRB5_ATTR_DEPRECATED
#endif

/* from profile.h */
struct _profile_t;
/* typedef struct _profile_t *profile_t; */

/*
 * begin wordsize.h
 */

/*
 * Word-size related definition.
 */

typedef uint8_t krb5_octet;
typedef int16_t krb5_int16;
typedef uint16_t krb5_ui_2;
typedef int32_t krb5_int32;
typedef uint32_t krb5_ui_4;

#define VALID_INT_BITS    INT_MAX
#define VALID_UINT_BITS   UINT_MAX

#define KRB5_INT32_MAX  2147483647
/* this strange form is necessary since - is a unary operator, not a sign
   indicator */
#define KRB5_INT32_MIN  (-KRB5_INT32_MAX-1)

#define KRB5_INT16_MAX 65535
/* this strange form is necessary since - is a unary operator, not a sign
   indicator */
#define KRB5_INT16_MIN  (-KRB5_INT16_MAX-1)

/*
 * end wordsize.h
 */

/*
 * begin "base-defs.h"
 */

/*
 * Basic definitions for Kerberos V5 library
 */

#ifndef FALSE
#define FALSE   0
#endif
#ifndef TRUE
#define TRUE    1
#endif

typedef unsigned int krb5_boolean;
typedef unsigned int krb5_msgtype;
typedef unsigned int krb5_kvno;

typedef krb5_int32 krb5_addrtype;
typedef krb5_int32 krb5_enctype;
typedef krb5_int32 krb5_cksumtype;
typedef krb5_int32 krb5_authdatatype;
typedef krb5_int32 krb5_keyusage;
typedef krb5_int32 krb5_cryptotype;

typedef krb5_int32      krb5_preauthtype; /* This may change, later on */
typedef krb5_int32      krb5_flags;

/**
 * Represents a timestamp in seconds since the POSIX epoch.  This legacy type
 * is used frequently in the ABI, but cannot represent timestamps after 2038 as
 * a positive number.  Code which uses this type should cast values of it to
 * uint32_t so that negative values are treated as timestamps between 2038 and
 * 2106 on platforms with 64-bit time_t.
 */
typedef krb5_int32      krb5_timestamp;

typedef krb5_int32      krb5_deltat;

/**
 * Used to convey an operation status.  The value 0 indicates success; any
 * other values are com_err codes.  Use krb5_get_error_message() to obtain a
 * string describing the error.
 */
typedef krb5_int32      krb5_error_code;

typedef krb5_error_code krb5_magic;

typedef struct _krb5_data {
    krb5_magic magic;
    unsigned int length;
    char *data;
} krb5_data;

/* Originally introduced for PKINIT; now unused.  Do not use this. */
typedef struct _krb5_octet_data {
    krb5_magic magic;
    unsigned int length;
    krb5_octet *data;
} krb5_octet_data;

/* Originally used to recognize AFS and default salts.  No longer used. */
#define SALT_TYPE_AFS_LENGTH UINT_MAX
#define SALT_TYPE_NO_LENGTH  UINT_MAX

typedef void * krb5_pointer;
typedef void const * krb5_const_pointer;

typedef struct krb5_principal_data {
    krb5_magic magic;
    krb5_data realm;
    krb5_data *data;            /**< An array of strings */
    krb5_int32 length;
    krb5_int32 type;
} krb5_principal_data;

typedef krb5_principal_data * krb5_principal;

/*
 * Per V5 spec on definition of principal types
 */

#define KRB5_NT_UNKNOWN        0 /**<  Name type not known */
#define KRB5_NT_PRINCIPAL      1 /**< Just the name of the principal
                                      as in DCE, or for users */
#define KRB5_NT_SRV_INST       2 /**< Service and other unique instance (krbtgt) */
#define KRB5_NT_SRV_HST        3 /**< Service with host name as instance
                                      (telnet, rcommands) */
#define KRB5_NT_SRV_XHST       4 /**< Service with host as remaining components */
#define KRB5_NT_UID            5 /**< Unique ID */
#define KRB5_NT_X500_PRINCIPAL 6 /**< PKINIT */
#define KRB5_NT_SMTP_NAME      7 /**< Name in form of SMTP email name */
#define KRB5_NT_ENTERPRISE_PRINCIPAL  10        /**< Windows 2000 UPN */
#define KRB5_NT_WELLKNOWN      11 /**< Well-known (special) principal */
#define KRB5_WELLKNOWN_NAMESTR "WELLKNOWN" /**< First component of
                                                NT_WELLKNOWN principals */
#define KRB5_NT_MS_PRINCIPAL         -128 /**< Windows 2000 UPN and SID */
#define KRB5_NT_MS_PRINCIPAL_AND_ID  -129 /**< NT 4 style name */
#define KRB5_NT_ENT_PRINCIPAL_AND_ID -130 /**< NT 4 style name and SID */

/** Constant version of krb5_principal_data */
typedef const krb5_principal_data *krb5_const_principal;

#define krb5_princ_realm(context, princ) (&(princ)->realm)
#define krb5_princ_set_realm(context, princ,value) ((princ)->realm = *(value))
#define krb5_princ_set_realm_length(context, princ,value) (princ)->realm.length = (value)
#define krb5_princ_set_realm_data(context, princ,value) (princ)->realm.data = (value)
#define krb5_princ_size(context, princ) (princ)->length
#define krb5_princ_type(context, princ) (princ)->type
#define krb5_princ_name(context, princ) (princ)->data
#define krb5_princ_component(context, princ,i)  \
    (((i) < krb5_princ_size(context, princ))    \
     ? (princ)->data + (i)                      \
     : NULL)

/** Constant for realm referrals. */
#define        KRB5_REFERRAL_REALM      ""

/*
 * Referral-specific functions.
 */

/**
 * Check for a match with KRB5_REFERRAL_REALM.
 *
 * @param [in] r                Realm to check
 *
 * @return @c TRUE if @a r is zero-length, @c FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_is_referral_realm(const krb5_data *r);

/**
 * Return an anonymous realm data.
 *
 * This function returns constant storage that must not be freed.
 *
 * @sa #KRB5_ANONYMOUS_REALMSTR
 */
const krb5_data *KRB5_CALLCONV
krb5_anonymous_realm(void);

/**
 * Build an anonymous principal.
 *
 * This function returns constant storage that must not be freed.
 *
 * @sa #KRB5_ANONYMOUS_PRINCSTR
 */
krb5_const_principal KRB5_CALLCONV
krb5_anonymous_principal(void);

#define KRB5_ANONYMOUS_REALMSTR "WELLKNOWN:ANONYMOUS" /**< Anonymous realm */
#define KRB5_ANONYMOUS_PRINCSTR "ANONYMOUS" /**< Anonymous principal name */
/*
 * end "base-defs.h"
 */

/*
 * begin "hostaddr.h"
 */

/** Structure for address */
typedef struct _krb5_address {
    krb5_magic magic;
    krb5_addrtype addrtype;
    unsigned int length;
    krb5_octet *contents;
} krb5_address;

/* per Kerberos v5 protocol spec */
#define ADDRTYPE_INET           0x0002
#define ADDRTYPE_CHAOS          0x0005
#define ADDRTYPE_XNS            0x0006
#define ADDRTYPE_ISO            0x0007
#define ADDRTYPE_DDP            0x0010
#define ADDRTYPE_NETBIOS        0x0014
#define ADDRTYPE_INET6          0x0018
/* not yet in the spec... */
#define ADDRTYPE_ADDRPORT       0x0100
#define ADDRTYPE_IPPORT         0x0101

/* macros to determine if a type is a local type */
#define ADDRTYPE_IS_LOCAL(addrtype) (addrtype & 0x8000)

/*
 * end "hostaddr.h"
 */


struct _krb5_context;
typedef struct _krb5_context * krb5_context;

struct _krb5_auth_context;
typedef struct _krb5_auth_context * krb5_auth_context;

struct _krb5_cryptosystem_entry;

/*
 * begin "encryption.h"
 */

/** Exposed contents of a key. */
typedef struct _krb5_keyblock {
    krb5_magic magic;
    krb5_enctype enctype;
    unsigned int length;
    krb5_octet *contents;
} krb5_keyblock;

struct krb5_key_st;
/**
 * Opaque identifier for a key.
 *
 * Use with the krb5_k APIs for better performance for repeated operations with
 * the same key and usage.  Key identifiers must not be used simultaneously
 * within multiple threads, as they may contain mutable internal state and are
 * not mutex-protected.
 */
typedef struct krb5_key_st *krb5_key;

#ifdef KRB5_OLD_CRYPTO
typedef struct _krb5_encrypt_block {
    krb5_magic magic;
    krb5_enctype crypto_entry;          /* to call krb5_encrypt_size, you need
                                           this.  it was a pointer, but it
                                           doesn't have to be.  gross. */
    krb5_keyblock *key;
} krb5_encrypt_block;
#endif

typedef struct _krb5_checksum {
    krb5_magic magic;
    krb5_cksumtype checksum_type;       /* checksum type */
    unsigned int length;
    krb5_octet *contents;
} krb5_checksum;

typedef struct _krb5_enc_data {
    krb5_magic magic;
    krb5_enctype enctype;
    krb5_kvno kvno;
    krb5_data ciphertext;
} krb5_enc_data;

/**
 * Structure to describe a region of text to be encrypted or decrypted.
 *
 * The @a flags member describes the type of the iov.
 * The @a data member points to the memory that will be manipulated.
 * All iov APIs take a pointer to the first element of an array of krb5_crypto_iov's
 * along with the size of that array. Buffer contents are manipulated in-place;
 * data is overwritten. Callers must allocate the right number of krb5_crypto_iov
 * structures before calling into an iov API.
 */
typedef struct _krb5_crypto_iov {
    krb5_cryptotype flags; /**< @ref KRB5_CRYPTO_TYPE type of the iov */
    krb5_data data;
} krb5_crypto_iov;

/* per Kerberos v5 protocol spec */
#define ENCTYPE_NULL            0x0000
#define ENCTYPE_DES_CBC_CRC     0x0001  /**< @deprecated no longer supported */
#define ENCTYPE_DES_CBC_MD4     0x0002  /**< @deprecated no longer supported */
#define ENCTYPE_DES_CBC_MD5     0x0003  /**< @deprecated no longer supported */
#define ENCTYPE_DES_CBC_RAW     0x0004  /**< @deprecated no longer supported */
#define ENCTYPE_DES3_CBC_SHA    0x0005  /**< @deprecated DES-3 cbc with SHA1 */
#define ENCTYPE_DES3_CBC_RAW    0x0006  /**< @deprecated DES-3 cbc mode raw */
#define ENCTYPE_DES_HMAC_SHA1   0x0008  /**< @deprecated no longer supported */
/* PKINIT */
#define ENCTYPE_DSA_SHA1_CMS    0x0009  /**< DSA with SHA1, CMS signature */
#define ENCTYPE_MD5_RSA_CMS     0x000a  /**< MD5 with RSA, CMS signature */
#define ENCTYPE_SHA1_RSA_CMS    0x000b  /**< SHA1 with RSA, CMS signature */
#define ENCTYPE_RC2_CBC_ENV     0x000c  /**< RC2 cbc mode, CMS enveloped data */
#define ENCTYPE_RSA_ENV         0x000d  /**< RSA encryption, CMS enveloped data */
#define ENCTYPE_RSA_ES_OAEP_ENV 0x000e  /**< RSA w/OEAP encryption, CMS enveloped data */
#define ENCTYPE_DES3_CBC_ENV    0x000f  /**< DES-3 cbc mode, CMS enveloped data */

#define ENCTYPE_DES3_CBC_SHA1               0x0010
#define ENCTYPE_AES128_CTS_HMAC_SHA1_96     0x0011 /**< RFC 3962 */
#define ENCTYPE_AES256_CTS_HMAC_SHA1_96     0x0012 /**< RFC 3962 */
#define ENCTYPE_AES128_CTS_HMAC_SHA256_128  0x0013 /**< RFC 8009 */
#define ENCTYPE_AES256_CTS_HMAC_SHA384_192  0x0014 /**< RFC 8009 */
#define ENCTYPE_ARCFOUR_HMAC                0x0017 /**< RFC 4757 */
#define ENCTYPE_ARCFOUR_HMAC_EXP            0x0018 /**< RFC 4757 */
#define ENCTYPE_CAMELLIA128_CTS_CMAC        0x0019 /**< RFC 6803 */
#define ENCTYPE_CAMELLIA256_CTS_CMAC        0x001a /**< RFC 6803 */
#define ENCTYPE_UNKNOWN                     0x01ff

#define CKSUMTYPE_CRC32         0x0001
#define CKSUMTYPE_RSA_MD4       0x0002
#define CKSUMTYPE_RSA_MD4_DES   0x0003
#define CKSUMTYPE_DESCBC        0x0004
/* des-mac-k */
/* rsa-md4-des-k */
#define CKSUMTYPE_RSA_MD5       0x0007
#define CKSUMTYPE_RSA_MD5_DES   0x0008
#define CKSUMTYPE_NIST_SHA      0x0009
#define CKSUMTYPE_HMAC_SHA1_DES3      0x000c
#define CKSUMTYPE_HMAC_SHA1_96_AES128 0x000f /**< RFC 3962. Used with
                                                ENCTYPE_AES128_CTS_HMAC_SHA1_96 */
#define CKSUMTYPE_HMAC_SHA1_96_AES256 0x0010 /**< RFC 3962. Used with
                                                ENCTYPE_AES256_CTS_HMAC_SHA1_96 */
#define CKSUMTYPE_HMAC_SHA256_128_AES128 0x0013 /**< RFC 8009 */
#define CKSUMTYPE_HMAC_SHA384_192_AES256 0x0014 /**< RFC 8009 */
#define CKSUMTYPE_CMAC_CAMELLIA128 0x0011 /**< RFC 6803 */
#define CKSUMTYPE_CMAC_CAMELLIA256 0x0012 /**< RFC 6803 */
#define CKSUMTYPE_MD5_HMAC_ARCFOUR -137 /* Microsoft netlogon */
#define CKSUMTYPE_HMAC_MD5_ARCFOUR -138 /**< RFC 4757 */

/*
 * The following are entropy source designations. Whenever
 * krb5_C_random_add_entropy is called, one of these source ids is passed in.
 * This allows the library to better estimate bits of entropy in the sample and
 * to keep track of what sources of entropy have contributed enough entropy.
 * Sources marked internal MUST NOT be used by applications outside the
 * Kerberos library
 */

enum {
    KRB5_C_RANDSOURCE_OLDAPI = 0, /*calls to krb5_C_RANDOM_SEED (INTERNAL)*/
    KRB5_C_RANDSOURCE_OSRAND = 1, /* /dev/random or equivalent (internal)*/
    KRB5_C_RANDSOURCE_TRUSTEDPARTY = 2, /* From KDC or other trusted party*/
    /*
     * This source should be used carefully; data in this category
     * should be from a third party trusted to give random bits
     * For example keys issued by the KDC in the application server.
     */
    KRB5_C_RANDSOURCE_TIMING = 3, /* Timing of operations*/
    KRB5_C_RANDSOURCE_EXTERNAL_PROTOCOL = 4, /*Protocol data possibly from attacker*/
    KRB5_C_RANDSOURCE_MAX = 5 /*Do not use; maximum source ID*/
};

#ifndef krb5_roundup
/* round x up to nearest multiple of y */
#define krb5_roundup(x, y) ((((x) + (y) - 1)/(y))*(y))
#endif /* roundup */

/* macro function definitions to help clean up code */

#if 1
#define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1))
#define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0))
#else
#define krb5_x(ptr,args) ((*(ptr)) args)
#define krb5_xc(ptr,args) ((*(ptr)) args)
#endif

/**
 * Encrypt data using a key (operates on keyblock).
 *
 * @param [in]     context      Library context
 * @param [in]     key          Encryption key
 * @param [in]     usage        Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in,out] cipher_state Cipher state; specify NULL if not needed
 * @param [in]     input        Data to be encrypted
 * @param [out]    output       Encrypted data
 *
 * This function encrypts the data block @a input and stores the output into @a
 * output.  The actual encryption key will be derived from @a key and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the encryption operation, and
 * is updated with the state to be passed as input to the next operation.
 *
 * @note The caller must initialize @a output and allocate at least enough
 * space for the result (using krb5_c_encrypt_length() to determine the amount
 * of space needed).  @a output->length will be set to the actual length of the
 * ciphertext.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_encrypt(krb5_context context, const krb5_keyblock *key,
               krb5_keyusage usage, const krb5_data *cipher_state,
               const krb5_data *input, krb5_enc_data *output);

/**
 * Decrypt data using a key (operates on keyblock).
 *
 * @param [in]     context      Library context
 * @param [in]     key          Encryption key
 * @param [in]     usage        Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in,out] cipher_state Cipher state; specify NULL if not needed
 * @param [in]     input        Encrypted data
 * @param [out]    output       Decrypted data
 *
 * This function decrypts the data block @a input and stores the output into @a
 * output. The actual decryption key will be derived from @a key and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the decryption operation, and
 * is updated with the state to be passed as input to the next operation.
 *
 * @note The caller must initialize @a output and allocate at least enough
 * space for the result.  The usual practice is to allocate an output buffer as
 * long as the ciphertext, and let krb5_c_decrypt() trim @a output->length.
 * For some enctypes, the resulting @a output->length may include padding
 * bytes.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_decrypt(krb5_context context, const krb5_keyblock *key,
               krb5_keyusage usage, const krb5_data *cipher_state,
               const krb5_enc_data *input, krb5_data *output);

/**
 * Compute encrypted data length.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [in]  inputlen        Length of the data to be encrypted
 * @param [out] length          Length of the encrypted data
 *
 * This function computes the length of the ciphertext produced by encrypting
 * @a inputlen bytes including padding, confounder, and checksum.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_encrypt_length(krb5_context context, krb5_enctype enctype,
                      size_t inputlen, size_t *length);

/**
 * Return cipher block size.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [out] blocksize       Block size for @a enctype
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_block_size(krb5_context context, krb5_enctype enctype,
                  size_t *blocksize);

/**
 * Return length of the specified key in bytes.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [out] keybytes        Number of bytes required to make a key
 * @param [out] keylength       Length of final key
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_keylengths(krb5_context context, krb5_enctype enctype,
                  size_t *keybytes, size_t *keylength);

/**
 * Initialize a new cipher state.
 *
 * @param [in]  context         Library context
 * @param [in]  key             Key
 * @param [in]  usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [out] new_state       New cipher state
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_init_state(krb5_context context, const krb5_keyblock *key,
                  krb5_keyusage usage, krb5_data *new_state);

/**
 * Free a cipher state previously allocated by krb5_c_init_state().
 *
 * @param [in] context          Library context
 * @param [in] key              Key
 * @param [in] state            Cipher state to be freed
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_free_state(krb5_context context, const krb5_keyblock *key,
                  krb5_data *state);

/**
 * Generate enctype-specific pseudo-random bytes.
 *
 * @param [in]  context         Library context
 * @param [in]  keyblock        Key
 * @param [in]  input           Input data
 * @param [out] output          Output data
 *
 * This function selects a pseudo-random function based on @a keyblock and
 * computes its value over @a input, placing the result into @a output.
 * The caller must preinitialize @a output and allocate space for the
 * result, using krb5_c_prf_length() to determine the required length.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_prf(krb5_context context, const krb5_keyblock *keyblock,
           krb5_data *input, krb5_data *output);

/**
 * Get the output length of pseudo-random functions for an encryption type.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [out] len             Length of PRF output
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_prf_length(krb5_context context, krb5_enctype enctype, size_t *len);

/**
 * Generate pseudo-random bytes using RFC 6113 PRF+.
 *
 * @param [in]  context         Library context
 * @param [in]  k               KDC contribution key
 * @param [in]  input           Input data
 * @param [out] output          Pseudo-random output buffer
 *
 * This function fills @a output with PRF+(k, input) as defined in RFC 6113
 * section 5.1.  The caller must preinitialize @a output and allocate the
 * desired amount of space.  The length of the pseudo-random output will match
 * the length of @a output.
 *
 * @note RFC 4402 defines a different PRF+ operation.  This function does not
 * implement that operation.
 *
 * @return 0 on success, @c E2BIG if output->length is too large for PRF+ to
 * generate, @c ENOMEM on allocation failure, or an error code from
 * krb5_c_prf()
 */
krb5_error_code KRB5_CALLCONV
krb5_c_prfplus(krb5_context context, const krb5_keyblock *k,
               const krb5_data *input, krb5_data *output);

/**
 * Derive a key using some input data (via RFC 6113 PRF+).
 *
 * @param [in]  context         Library context
 * @param [in]  k               KDC contribution key
 * @param [in]  input           Input string
 * @param [in]  enctype         Output key enctype (or @c ENCTYPE_NULL)
 * @param [out] out             Derived keyblock
 *
 * This function uses PRF+ as defined in RFC 6113 to derive a key from another
 * key and an input string.  If @a enctype is @c ENCTYPE_NULL, the output key
 * will have the same enctype as the input key.
 */
krb5_error_code KRB5_CALLCONV
krb5_c_derive_prfplus(krb5_context context, const krb5_keyblock *k,
                      const krb5_data *input, krb5_enctype enctype,
                      krb5_keyblock **out);

/**
 * Compute the KRB-FX-CF2 combination of two keys and pepper strings.
 *
 * @param [in]  context         Library context
 * @param [in]  k1              KDC contribution key
 * @param [in]  pepper1         String "PKINIT"
 * @param [in]  k2              Reply key
 * @param [in]  pepper2         String "KeyExchange"
 * @param [out] out             Output key
 *
 * This function computes the KRB-FX-CF2 function over its inputs and places
 * the results in a newly allocated keyblock.  This function is simple in that
 * it assumes that @a pepper1 and @a pepper2 are C strings with no internal
 * nulls and that the enctype of the result will be the same as that of @a k1.
 * @a k1 and @a k2 may be of different enctypes.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_fx_cf2_simple(krb5_context context,
                     const krb5_keyblock *k1, const char *pepper1,
                     const krb5_keyblock *k2, const char *pepper2,
                     krb5_keyblock **out);

/**
 * Generate an enctype-specific random encryption key.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type of the generated key
 * @param [out] k5_random_key   An allocated and initialized keyblock
 *
 * Use krb5_free_keyblock_contents() to free @a k5_random_key when
 * no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_make_random_key(krb5_context context, krb5_enctype enctype,
                       krb5_keyblock *k5_random_key);

/**
 * Generate an enctype-specific key from random data.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [in]  random_data     Random input data
 * @param [out] k5_random_key   Resulting key
 *
 * This function takes random input data @a random_data and produces a valid
 * key @a k5_random_key for a given @a enctype.
 *
 * @note It is assumed that @a k5_random_key has already been initialized and
 * @a k5_random_key->contents has been allocated with the correct length.
 *
 * @sa krb5_c_keylengths()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_random_to_key(krb5_context context, krb5_enctype enctype,
                     krb5_data *random_data, krb5_keyblock *k5_random_key);

/**
 * Add entropy to the pseudo-random number generator.
 *
 * @param [in] context          Library context
 * @param [in] randsource       Entropy source (see KRB5_RANDSOURCE types)
 * @param [in] data             Data
 *
 * Contribute entropy to the PRNG used by krb5 crypto operations.  This may or
 * may not affect the output of the next crypto operation requiring random
 * data.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_random_add_entropy(krb5_context context, unsigned int randsource,
                          const krb5_data *data);

/**
 * Generate pseudo-random bytes.
 *
 * @param [in]  context         Library context
 * @param [out] data            Random data
 *
 * Fills in @a data with bytes from the PRNG used by krb5 crypto operations.
 * The caller must preinitialize @a data and allocate the desired amount of
 * space.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_random_make_octets(krb5_context context, krb5_data *data);

/**
 * Collect entropy from the OS if possible.
 *
 * @param [in]  context         Library context
 * @param [in]  strong          Strongest available source of entropy
 * @param [out] success         1 if OS provides entropy, 0 otherwise
 *
 * If @a strong is non-zero, this function attempts to use the strongest
 * available source of entropy.  Setting this flag may cause the function to
 * block on some operating systems.  Good uses include seeding the PRNG for
 * kadmind and realm setup.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_random_os_entropy(krb5_context context, int strong, int *success);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_c_random_seed(krb5_context context, krb5_data *data);

/**
 * Convert a string (such a password) to a key.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [in]  string          String to be converted
 * @param [in]  salt            Salt value
 * @param [out] key             Generated key
 *
 * This function converts @a string to a @a key of encryption type @a enctype,
 * using the specified @a salt.  The newly created @a key must be released by
 * calling krb5_free_keyblock_contents() when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_string_to_key(krb5_context context, krb5_enctype enctype,
                     const krb5_data *string, const krb5_data *salt,
                     krb5_keyblock *key);

/**
 * Convert a string (such as a password) to a key with additional parameters.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [in]  string          String to be converted
 * @param [in]  salt            Salt value
 * @param [in]  params          Parameters
 * @param [out] key             Generated key
 *
 * This function is similar to krb5_c_string_to_key(), but also takes
 * parameters which may affect the algorithm in an enctype-dependent way.  The
 * newly created @a key must be released by calling
 * krb5_free_keyblock_contents() when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_string_to_key_with_params(krb5_context context,
                                 krb5_enctype enctype,
                                 const krb5_data *string,
                                 const krb5_data *salt,
                                 const krb5_data *params,
                                 krb5_keyblock *key);

/**
 * Compare two encryption types.
 *
 * @param [in]  context         Library context
 * @param [in]  e1              First encryption type
 * @param [in]  e2              Second encryption type
 * @param [out] similar         @c TRUE if types are similar, @c FALSE if not
 *
 * This function determines whether two encryption types use the same kind of
 * keys.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_enctype_compare(krb5_context context, krb5_enctype e1, krb5_enctype e2,
                       krb5_boolean *similar);

/**
 * Compute a checksum (operates on keyblock).
 *
 * @param [in]  context         Library context
 * @param [in]  cksumtype       Checksum type (0 for mandatory type)
 * @param [in]  key             Encryption key for a keyed checksum
 * @param [in]  usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]  input           Input data
 * @param [out] cksum           Generated checksum
 *
 * This function computes a checksum of type @a cksumtype over @a input, using
 * @a key if the checksum type is a keyed checksum.  If @a cksumtype is 0 and
 * @a key is non-null, the checksum type will be the mandatory-to-implement
 * checksum type for the key's encryption type.  The actual checksum key will
 * be derived from @a key and @a usage if key derivation is specified for the
 * checksum type.  The newly created @a cksum must be released by calling
 * krb5_free_checksum_contents() when it is no longer needed.
 *
 * @note This function is similar to krb5_k_make_checksum(), but operates
 * on keyblock @a key.
 *
 * @sa krb5_c_verify_checksum()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_make_checksum(krb5_context context, krb5_cksumtype cksumtype,
                     const krb5_keyblock *key, krb5_keyusage usage,
                     const krb5_data *input, krb5_checksum *cksum);

/**
 * Verify a checksum (operates on keyblock).
 *
 * @param [in]  context         Library context
 * @param [in]  key             Encryption key for a keyed checksum
 * @param [in]  usage           @a key usage
 * @param [in]  data            Data to be used to compute a new checksum
 *                              using @a key to compare @a cksum against
 * @param [in]  cksum           Checksum to be verified
 * @param [out] valid           Non-zero for success, zero for failure
 *
 * This function verifies that @a cksum is a valid checksum for @a data.  If
 * the checksum type of @a cksum is a keyed checksum, @a key is used to verify
 * the checksum.  If the checksum type in @a cksum is 0 and @a key is not NULL,
 * the mandatory checksum type for @a key will be used.  The actual checksum
 * key will be derived from @a key and @a usage if key derivation is specified
 * for the checksum type.
 *
 * @note This function is similar to krb5_k_verify_checksum(), but operates
 * on keyblock @a key.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_verify_checksum(krb5_context context, const krb5_keyblock *key,
                       krb5_keyusage usage, const krb5_data *data,
                       const krb5_checksum *cksum, krb5_boolean *valid);

/**
 * Return the length of checksums for a checksum type.
 *
 * @param [in]  context         Library context
 * @param [in]  cksumtype       Checksum type
 * @param [out] length          Checksum length
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_checksum_length(krb5_context context, krb5_cksumtype cksumtype,
                       size_t *length);

/**
 * Return a list of keyed checksum types usable with an encryption type.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [out] count           Count of allowable checksum types
 * @param [out] cksumtypes      Array of allowable checksum types
 *
 * Use krb5_free_cksumtypes() to free @a cksumtypes when it is no longer
 * needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_keyed_checksum_types(krb5_context context, krb5_enctype enctype,
                            unsigned int *count, krb5_cksumtype **cksumtypes);

/** @defgroup KRB5_KEYUSAGE KRB5_KEYUSAGE
 * @{
 */
#define KRB5_KEYUSAGE_AS_REQ_PA_ENC_TS          1
#define KRB5_KEYUSAGE_KDC_REP_TICKET            2
#define KRB5_KEYUSAGE_AS_REP_ENCPART            3
#define KRB5_KEYUSAGE_TGS_REQ_AD_SESSKEY        4
#define KRB5_KEYUSAGE_TGS_REQ_AD_SUBKEY         5
#define KRB5_KEYUSAGE_TGS_REQ_AUTH_CKSUM        6
#define KRB5_KEYUSAGE_TGS_REQ_AUTH              7
#define KRB5_KEYUSAGE_TGS_REP_ENCPART_SESSKEY   8
#define KRB5_KEYUSAGE_TGS_REP_ENCPART_SUBKEY    9
#define KRB5_KEYUSAGE_AP_REQ_AUTH_CKSUM         10
#define KRB5_KEYUSAGE_AP_REQ_AUTH               11
#define KRB5_KEYUSAGE_AP_REP_ENCPART            12
#define KRB5_KEYUSAGE_KRB_PRIV_ENCPART          13
#define KRB5_KEYUSAGE_KRB_CRED_ENCPART          14
#define KRB5_KEYUSAGE_KRB_SAFE_CKSUM            15
#define KRB5_KEYUSAGE_APP_DATA_ENCRYPT          16
#define KRB5_KEYUSAGE_APP_DATA_CKSUM            17
#define KRB5_KEYUSAGE_KRB_ERROR_CKSUM           18
#define KRB5_KEYUSAGE_AD_KDCISSUED_CKSUM        19
#define KRB5_KEYUSAGE_AD_MTE                    20
#define KRB5_KEYUSAGE_AD_ITE                    21

/* XXX need to register these */

#define KRB5_KEYUSAGE_GSS_TOK_MIC               22
#define KRB5_KEYUSAGE_GSS_TOK_WRAP_INTEG        23
#define KRB5_KEYUSAGE_GSS_TOK_WRAP_PRIV         24

/* Defined in Integrating SAM Mechanisms with Kerberos draft */
#define KRB5_KEYUSAGE_PA_SAM_CHALLENGE_CKSUM    25
/** Note conflict with @ref KRB5_KEYUSAGE_PA_S4U_X509_USER_REQUEST */
#define KRB5_KEYUSAGE_PA_SAM_CHALLENGE_TRACKID  26
/** Note conflict with @ref KRB5_KEYUSAGE_PA_S4U_X509_USER_REPLY */
#define KRB5_KEYUSAGE_PA_SAM_RESPONSE           27

/* Defined in [MS-SFU] */
/** Note conflict with @ref KRB5_KEYUSAGE_PA_SAM_CHALLENGE_TRACKID */
#define KRB5_KEYUSAGE_PA_S4U_X509_USER_REQUEST  26
/** Note conflict with @ref KRB5_KEYUSAGE_PA_SAM_RESPONSE */
#define KRB5_KEYUSAGE_PA_S4U_X509_USER_REPLY    27

/* unused */
#define KRB5_KEYUSAGE_PA_REFERRAL               26

#define KRB5_KEYUSAGE_AD_SIGNEDPATH             -21
#define KRB5_KEYUSAGE_IAKERB_FINISHED           42
#define KRB5_KEYUSAGE_PA_PKINIT_KX              44
#define KRB5_KEYUSAGE_PA_OTP_REQUEST  45  /**< See RFC 6560 section 4.2 */
/* define in draft-ietf-krb-wg-preauth-framework*/
#define KRB5_KEYUSAGE_FAST_REQ_CHKSUM 50
#define KRB5_KEYUSAGE_FAST_ENC 51
#define KRB5_KEYUSAGE_FAST_REP 52
#define KRB5_KEYUSAGE_FAST_FINISHED 53
#define KRB5_KEYUSAGE_ENC_CHALLENGE_CLIENT 54
#define KRB5_KEYUSAGE_ENC_CHALLENGE_KDC 55
#define KRB5_KEYUSAGE_AS_REQ 56
#define KRB5_KEYUSAGE_CAMMAC 64
#define KRB5_KEYUSAGE_SPAKE 65

/* Key usage values 512-1023 are reserved for uses internal to a Kerberos
 * implementation. */
#define KRB5_KEYUSAGE_PA_FX_COOKIE 513  /**< Used for encrypted FAST cookies */
#define KRB5_KEYUSAGE_PA_AS_FRESHNESS 514  /**< Used for freshness tokens */
/** @} */ /* end of KRB5_KEYUSAGE group */

/**
 * Verify that a specified encryption type is a valid Kerberos encryption type.
 *
 * @param [in] ktype            Encryption type
 *
 * @return @c TRUE if @a ktype is valid, @c FALSE if not
 */
krb5_boolean KRB5_CALLCONV
krb5_c_valid_enctype(krb5_enctype ktype);

/**
 * Verify that specified checksum type is a valid Kerberos checksum type.
 *
 * @param [in] ctype            Checksum type
 *
 * @return @c TRUE if @a ctype is valid, @c FALSE if not
 */
krb5_boolean KRB5_CALLCONV
krb5_c_valid_cksumtype(krb5_cksumtype ctype);

/**
 * Test whether a checksum type is collision-proof.
 *
 * @param [in] ctype            Checksum type
 *
 * @return @c TRUE if @a ctype is collision-proof, @c FALSE if it is not
 * collision-proof or not a valid checksum type.
 */
krb5_boolean KRB5_CALLCONV
krb5_c_is_coll_proof_cksum(krb5_cksumtype ctype);

/**
 * Test whether a checksum type is keyed.
 *
 * @param [in] ctype            Checksum type
 *
 * @return @c TRUE if @a ctype is a keyed checksum type, @c FALSE otherwise.
 */
krb5_boolean KRB5_CALLCONV
krb5_c_is_keyed_cksum(krb5_cksumtype ctype);

/* AEAD APIs */
/** @defgroup KRB5_CRYPTO_TYPE KRB5_CRYPTO_TYPE
 * @{
 */
#define KRB5_CRYPTO_TYPE_EMPTY      0   /**< [in] ignored */
#define KRB5_CRYPTO_TYPE_HEADER     1   /**< [out] header */
#define KRB5_CRYPTO_TYPE_DATA       2   /**< [in, out] plaintext */
#define KRB5_CRYPTO_TYPE_SIGN_ONLY  3   /**< [in] associated data */
#define KRB5_CRYPTO_TYPE_PADDING    4   /**< [out] padding */
#define KRB5_CRYPTO_TYPE_TRAILER    5   /**< [out] checksum for encrypt */
#define KRB5_CRYPTO_TYPE_CHECKSUM   6   /**< [out] checksum for MIC */
#define KRB5_CRYPTO_TYPE_STREAM     7   /**< [in] entire message without
                                           decomposing the structure into
                                           header, data and trailer buffers */
/** @} */ /* end of KRB5_CRYPTO_TYPE group */

/**
 * Fill in a checksum element in IOV array (operates on keyblock)
 *
 * @param [in]     context         Library context
 * @param [in]     cksumtype       Checksum type (0 for mandatory type)
 * @param [in]     key             Encryption key for a keyed checksum
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in,out] data            IOV array
 * @param [in]     num_data        Size of @a data
 *
 * Create a checksum in the #KRB5_CRYPTO_TYPE_CHECKSUM element over
 * #KRB5_CRYPTO_TYPE_DATA and #KRB5_CRYPTO_TYPE_SIGN_ONLY chunks in @a data.
 * Only the #KRB5_CRYPTO_TYPE_CHECKSUM region is modified.
 *
 * @note This function is similar to krb5_k_make_checksum_iov(), but operates
 * on keyblock @a key.
 *
 * @sa krb5_c_verify_checksum_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_make_checksum_iov(krb5_context context, krb5_cksumtype cksumtype,
                         const krb5_keyblock *key, krb5_keyusage usage,
                         krb5_crypto_iov *data, size_t num_data);

/**
 * Validate a checksum element in IOV array (operates on keyblock).
 *
 * @param [in]     context         Library context
 * @param [in]     cksumtype       Checksum type (0 for mandatory type)
 * @param [in]     key             Encryption key for a keyed checksum
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]     data            IOV array
 * @param [in]     num_data        Size of @a data
 * @param [out]    valid           Non-zero for success, zero for failure
 *
 * Confirm that the checksum in the #KRB5_CRYPTO_TYPE_CHECKSUM element is a
 * valid checksum of the #KRB5_CRYPTO_TYPE_DATA and #KRB5_CRYPTO_TYPE_SIGN_ONLY
 * regions in the iov.
 *
 * @note This function is similar to krb5_k_verify_checksum_iov(), but operates
 * on keyblock @a key.
 *
 * @sa krb5_c_make_checksum_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_verify_checksum_iov(krb5_context context, krb5_cksumtype cksumtype,
                           const krb5_keyblock *key, krb5_keyusage usage,
                           const krb5_crypto_iov *data, size_t num_data,
                           krb5_boolean *valid);

/**
 * Encrypt data in place supporting AEAD (operates on keyblock).
 *
 * @param [in]     context         Library context
 * @param [in]     keyblock        Encryption key
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]     cipher_state    Cipher state; specify NULL if not needed
 * @param [in,out] data            IOV array. Modified in-place.
 * @param [in]     num_data        Size of @a data
 *
 * This function encrypts the data block @a data and stores the output in-place.
 * The actual encryption key will be derived from @a keyblock and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the encryption operation, and
 * is updated with the state to be passed as input to the next operation.
 * The caller must allocate the right number of krb5_crypto_iov
 * structures before calling into this API.
 *
 * @note On return from a krb5_c_encrypt_iov() call, the @a data->length in the
 * iov structure are adjusted to reflect actual lengths of the ciphertext used.
 * For example, if the padding length is too large, the length will be reduced.
 * Lengths are never increased.
 *
 * @note This function is similar to krb5_k_encrypt_iov(), but operates
 * on keyblock @a keyblock.
 *
 * @sa krb5_c_decrypt_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_encrypt_iov(krb5_context context, const krb5_keyblock *keyblock,
                   krb5_keyusage usage, const krb5_data *cipher_state,
                   krb5_crypto_iov *data, size_t num_data);

/**
 * Decrypt data in place supporting AEAD (operates on keyblock).
 *
 * @param [in]     context         Library context
 * @param [in]     keyblock        Encryption key
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]     cipher_state    Cipher state; specify NULL if not needed
 * @param [in,out] data            IOV array. Modified in-place.
 * @param [in]     num_data        Size of @a data
 *
 * This function decrypts the data block @a data and stores the output in-place.
 * The actual decryption key will be derived from @a keyblock and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the decryption operation, and
 * is updated with the state to be passed as input to the next operation.
 * The caller must allocate the right number of krb5_crypto_iov
 * structures before calling into this API.
 *
 * @note On return from a krb5_c_decrypt_iov() call, the @a data->length in the
 * iov structure are adjusted to reflect actual lengths of the ciphertext used.
 * For example, if the padding length is too large, the length will be reduced.
 * Lengths are never increased.
 *
 * @note This function is similar to krb5_k_decrypt_iov(), but operates
 * on keyblock @a keyblock.
 *
 * @sa krb5_c_decrypt_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_decrypt_iov(krb5_context context, const krb5_keyblock *keyblock,
                   krb5_keyusage usage, const krb5_data *cipher_state,
                   krb5_crypto_iov *data, size_t num_data);

/**
 * Return a length of a message field specific to the encryption type.
 *
 * @param [in]  context      Library context
 * @param [in]  enctype      Encryption type
 * @param [in]  type         Type field (See @ref KRB5_CRYPTO_TYPE types)
 * @param [out] size         Length of the @a type specific to @a enctype
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_crypto_length(krb5_context context, krb5_enctype enctype,
                     krb5_cryptotype type, unsigned int *size);

/**
 * Fill in lengths for header, trailer and padding in a IOV array.
 *
 * @param [in]      context      Library context
 * @param [in]      enctype      Encryption type
 * @param [in,out]  data         IOV array
 * @param [in]      num_data     Size of @a data
 *
 * Padding is set to the actual padding required based on the provided
 * @a data buffers. Typically this API is used after setting up the data
 * buffers and #KRB5_CRYPTO_TYPE_SIGN_ONLY buffers, but before actually
 * allocating header, trailer and padding.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_crypto_length_iov(krb5_context context, krb5_enctype enctype,
                         krb5_crypto_iov *data, size_t num_data);

/**
 * Return a number of padding octets.
 *
 * @param [in]  context      Library context
 * @param [in]  enctype      Encryption type
 * @param [in]  data_length  Length of the plaintext to pad
 * @param [out] size         Number of padding octets
 *
 * This function returns the number of the padding octets required to pad
 * @a data_length octets of plaintext.
 *
 * @retval 0 Success; otherwise - KRB5_BAD_ENCTYPE
 */
krb5_error_code KRB5_CALLCONV
krb5_c_padding_length(krb5_context context, krb5_enctype enctype,
                      size_t data_length, unsigned int *size);

/**
 * Create a krb5_key from the enctype and key data in a keyblock.
 *
 * @param [in]  context      Library context
 * @param [in]  key_data     Keyblock
 * @param [out] out          Opaque key
 *
 * The reference count on a key @a out is set to 1.
 * Use krb5_k_free_key() to free @a out when it is no longer needed.
 *
 * @retval 0 Success; otherwise - KRB5_BAD_ENCTYPE
 */
krb5_error_code KRB5_CALLCONV
krb5_k_create_key(krb5_context context, const krb5_keyblock *key_data,
                  krb5_key *out);

/** Increment the reference count on a key. */
void KRB5_CALLCONV
krb5_k_reference_key(krb5_context context, krb5_key key);

/** Decrement the reference count on a key and free it if it hits zero. */
void KRB5_CALLCONV
krb5_k_free_key(krb5_context context, krb5_key key);

/** Retrieve a copy of the keyblock from a krb5_key structure. */
krb5_error_code KRB5_CALLCONV
krb5_k_key_keyblock(krb5_context context, krb5_key key,
                    krb5_keyblock **key_data);

/** Retrieve the enctype of a krb5_key structure. */
krb5_enctype KRB5_CALLCONV
krb5_k_key_enctype(krb5_context context, krb5_key key);

/**
 * Encrypt data using a key (operates on opaque key).
 *
 * @param [in]     context      Library context
 * @param [in]     key          Encryption key
 * @param [in]     usage        Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in,out] cipher_state Cipher state; specify NULL if not needed
 * @param [in]     input        Data to be encrypted
 * @param [out]    output       Encrypted data
 *
 * This function encrypts the data block @a input and stores the output into @a
 * output.  The actual encryption key will be derived from @a key and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the encryption operation, and
 * is updated with the state to be passed as input to the next operation.
 *
 * @note The caller must initialize @a output and allocate at least enough
 * space for the result (using krb5_c_encrypt_length() to determine the amount
 * of space needed).  @a output->length will be set to the actual length of the
 * ciphertext.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_encrypt(krb5_context context, krb5_key key, krb5_keyusage usage,
               const krb5_data *cipher_state, const krb5_data *input,
               krb5_enc_data *output);

/**
 * Encrypt data in place supporting AEAD (operates on opaque key).
 *
 * @param [in]     context         Library context
 * @param [in]     key             Encryption key
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]     cipher_state    Cipher state; specify NULL if not needed
 * @param [in,out] data            IOV array. Modified in-place.
 * @param [in]     num_data        Size of @a data
 *
 * This function encrypts the data block @a data and stores the output in-place.
 * The actual encryption key will be derived from @a key and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the encryption operation, and
 * is updated with the state to be passed as input to the next operation.
 * The caller must allocate the right number of krb5_crypto_iov
 * structures before calling into this API.
 *
 * @note On return from a krb5_c_encrypt_iov() call, the @a data->length in the
 * iov structure are adjusted to reflect actual lengths of the ciphertext used.
 * For example, if the padding length is too large, the length will be reduced.
 * Lengths are never increased.
 *
 * @note This function is similar to krb5_c_encrypt_iov(), but operates
 * on opaque key @a key.
 *
 * @sa krb5_k_decrypt_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_encrypt_iov(krb5_context context, krb5_key key, krb5_keyusage usage,
                   const krb5_data *cipher_state, krb5_crypto_iov *data,
                   size_t num_data);

/**
 * Decrypt data using a key (operates on opaque key).
 *
 * @param [in]     context      Library context
 * @param [in]     key          Encryption key
 * @param [in]     usage        Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in,out] cipher_state Cipher state; specify NULL if not needed
 * @param [in]     input        Encrypted data
 * @param [out]    output       Decrypted data
 *
 * This function decrypts the data block @a input and stores the output into @a
 * output. The actual decryption key will be derived from @a key and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the decryption operation, and
 * is updated with the state to be passed as input to the next operation.
 *
 * @note The caller must initialize @a output and allocate at least enough
 * space for the result.  The usual practice is to allocate an output buffer as
 * long as the ciphertext, and let krb5_c_decrypt() trim @a output->length.
 * For some enctypes, the resulting @a output->length may include padding
 * bytes.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_decrypt(krb5_context context, krb5_key key, krb5_keyusage usage,
               const krb5_data *cipher_state, const krb5_enc_data *input,
               krb5_data *output);

/**
 * Decrypt data in place supporting AEAD (operates on opaque key).
 *
 * @param [in]     context         Library context
 * @param [in]     key             Encryption key
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]     cipher_state    Cipher state; specify NULL if not needed
 * @param [in,out] data            IOV array. Modified in-place.
 * @param [in]     num_data        Size of @a data
 *
 * This function decrypts the data block @a data and stores the output in-place.
 * The actual decryption key will be derived from @a key and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the decryption operation, and
 * is updated with the state to be passed as input to the next operation.
 * The caller must allocate the right number of krb5_crypto_iov
 * structures before calling into this API.
 *
 * @note On return from a krb5_c_decrypt_iov() call, the @a data->length in the
 * iov structure are adjusted to reflect actual lengths of the ciphertext used.
 * For example, if the padding length is too large, the length will be reduced.
 * Lengths are never increased.
 *
 * @note This function is similar to krb5_c_decrypt_iov(), but operates
 * on opaque key @a key.
 *
 * @sa krb5_k_encrypt_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_decrypt_iov(krb5_context context, krb5_key key, krb5_keyusage usage,
                   const krb5_data *cipher_state, krb5_crypto_iov *data,
                   size_t num_data);
/**
 * Compute a checksum (operates on opaque key).
 *
 * @param [in]  context         Library context
 * @param [in]  cksumtype       Checksum type (0 for mandatory type)
 * @param [in]  key             Encryption key for a keyed checksum
 * @param [in]  usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]  input           Input data
 * @param [out] cksum           Generated checksum
 *
 * This function computes a checksum of type @a cksumtype over @a input, using
 * @a key if the checksum type is a keyed checksum.  If @a cksumtype is 0 and
 * @a key is non-null, the checksum type will be the mandatory-to-implement
 * checksum type for the key's encryption type.  The actual checksum key will
 * be derived from @a key and @a usage if key derivation is specified for the
 * checksum type.  The newly created @a cksum must be released by calling
 * krb5_free_checksum_contents() when it is no longer needed.
 *
 * @note This function is similar to krb5_c_make_checksum(), but operates
 * on opaque @a key.
 *
 * @sa krb5_c_verify_checksum()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_make_checksum(krb5_context context, krb5_cksumtype cksumtype,
                     krb5_key key, krb5_keyusage usage, const krb5_data *input,
                     krb5_checksum *cksum);

/**
 * Fill in a checksum element in IOV array (operates on opaque key)
 *
 * @param [in]     context         Library context
 * @param [in]     cksumtype       Checksum type (0 for mandatory type)
 * @param [in]     key             Encryption key for a keyed checksum
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in,out] data            IOV array
 * @param [in]     num_data        Size of @a data
 *
 * Create a checksum in the #KRB5_CRYPTO_TYPE_CHECKSUM element over
 * #KRB5_CRYPTO_TYPE_DATA and #KRB5_CRYPTO_TYPE_SIGN_ONLY chunks in @a data.
 * Only the #KRB5_CRYPTO_TYPE_CHECKSUM region is modified.
 *
 * @note This function is similar to krb5_c_make_checksum_iov(), but operates
 * on opaque @a key.
 *
 * @sa krb5_k_verify_checksum_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_make_checksum_iov(krb5_context context, krb5_cksumtype cksumtype,
                         krb5_key key, krb5_keyusage usage,
                         krb5_crypto_iov *data, size_t num_data);

/**
 * Verify a checksum (operates on opaque key).
 *
 * @param [in]  context         Library context
 * @param [in]  key             Encryption key for a keyed checksum
 * @param [in]  usage           @a key usage
 * @param [in]  data            Data to be used to compute a new checksum
 *                              using @a key to compare @a cksum against
 * @param [in]  cksum           Checksum to be verified
 * @param [out] valid           Non-zero for success, zero for failure
 *
 * This function verifies that @a cksum is a valid checksum for @a data.  If
 * the checksum type of @a cksum is a keyed checksum, @a key is used to verify
 * the checksum.  If the checksum type in @a cksum is 0 and @a key is not NULL,
 * the mandatory checksum type for @a key will be used.  The actual checksum
 * key will be derived from @a key and @a usage if key derivation is specified
 * for the checksum type.
 *
 * @note This function is similar to krb5_c_verify_checksum(), but operates
 * on opaque @a key.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_verify_checksum(krb5_context context, krb5_key key, krb5_keyusage usage,
                       const krb5_data *data, const krb5_checksum *cksum,
                       krb5_boolean *valid);

/**
 * Validate a checksum element in IOV array (operates on opaque key).
 *
 * @param [in]     context         Library context
 * @param [in]     cksumtype       Checksum type (0 for mandatory type)
 * @param [in]     key             Encryption key for a keyed checksum
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]     data            IOV array
 * @param [in]     num_data        Size of @a data
 * @param [out]    valid           Non-zero for success, zero for failure
 *
 * Confirm that the checksum in the #KRB5_CRYPTO_TYPE_CHECKSUM element is a
 * valid checksum of the #KRB5_CRYPTO_TYPE_DATA and #KRB5_CRYPTO_TYPE_SIGN_ONLY
 * regions in the iov.
 *
 * @note This function is similar to krb5_c_verify_checksum_iov(), but operates
 * on opaque @a key.
 *
 * @sa krb5_k_make_checksum_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_verify_checksum_iov(krb5_context context, krb5_cksumtype cksumtype,
                           krb5_key key, krb5_keyusage usage,
                           const krb5_crypto_iov *data, size_t num_data,
                           krb5_boolean *valid);

/**
 * Generate enctype-specific pseudo-random bytes (operates on opaque key).
 *
 * @param [in]  context      Library context
 * @param [in]  key          Key
 * @param [in]  input        Input data
 * @param [out] output       Output data
 *
 * This function selects a pseudo-random function based on @a key and
 * computes its value over @a input, placing the result into @a output.
 * The caller must preinitialize @a output and allocate space for the
 * result.
 *
 * @note This function is similar to krb5_c_prf(), but operates
 * on opaque @a key.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_prf(krb5_context context, krb5_key key, krb5_data *input, krb5_data *output);

#ifdef KRB5_OLD_CRYPTO
/*
 * old cryptosystem routine prototypes.  These are now layered
 * on top of the functions above.
 */
/** @deprecated Replaced by krb5_c_* API family.*/
krb5_error_code KRB5_CALLCONV
krb5_encrypt(krb5_context context, krb5_const_pointer inptr,
             krb5_pointer outptr, size_t size, krb5_encrypt_block *eblock,
             krb5_pointer ivec);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_decrypt(krb5_context context, krb5_const_pointer inptr,
             krb5_pointer outptr, size_t size, krb5_encrypt_block *eblock,
             krb5_pointer ivec);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_process_key(krb5_context context, krb5_encrypt_block *eblock,
                 const krb5_keyblock * key);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_finish_key(krb5_context context, krb5_encrypt_block * eblock);

/** @deprecated See krb5_c_string_to_key() */
krb5_error_code KRB5_CALLCONV
krb5_string_to_key(krb5_context context, const krb5_encrypt_block *eblock,
                   krb5_keyblock * keyblock, const krb5_data *data,
                   const krb5_data *salt);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_init_random_key(krb5_context context, const krb5_encrypt_block *eblock,
                     const krb5_keyblock *keyblock, krb5_pointer *ptr);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_finish_random_key(krb5_context context, const krb5_encrypt_block *eblock,
                       krb5_pointer *ptr);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_random_key(krb5_context context, const krb5_encrypt_block *eblock,
                krb5_pointer ptr, krb5_keyblock **keyblock);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_enctype KRB5_CALLCONV
krb5_eblock_enctype(krb5_context context, const krb5_encrypt_block *eblock);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_use_enctype(krb5_context context, krb5_encrypt_block *eblock,
                 krb5_enctype enctype);

/** @deprecated Replaced by krb5_c_* API family. */
size_t KRB5_CALLCONV
krb5_encrypt_size(size_t length, krb5_enctype crypto);

/** @deprecated See krb5_c_checksum_length() */
size_t KRB5_CALLCONV
krb5_checksum_size(krb5_context context, krb5_cksumtype ctype);

/** @deprecated See krb5_c_make_checksum() */
krb5_error_code KRB5_CALLCONV
krb5_calculate_checksum(krb5_context context, krb5_cksumtype ctype,
                        krb5_const_pointer in, size_t in_length,
                        krb5_const_pointer seed, size_t seed_length,
                        krb5_checksum * outcksum);

/** @deprecated See krb5_c_verify_checksum() */
krb5_error_code KRB5_CALLCONV
krb5_verify_checksum(krb5_context context, krb5_cksumtype ctype,
                     const krb5_checksum * cksum, krb5_const_pointer in,
                     size_t in_length, krb5_const_pointer seed,
                     size_t seed_length);

#endif /* KRB5_OLD_CRYPTO */

/*
 * end "encryption.h"
 */

/*
 * begin "fieldbits.h"
 */

/* kdc_options for kdc_request */
/* options is 32 bits; each host is responsible to put the 4 bytes
   representing these bits into net order before transmission */
/* #define      KDC_OPT_RESERVED        0x80000000 */
#define KDC_OPT_FORWARDABLE             0x40000000
#define KDC_OPT_FORWARDED               0x20000000
#define KDC_OPT_PROXIABLE               0x10000000
#define KDC_OPT_PROXY                   0x08000000
#define KDC_OPT_ALLOW_POSTDATE          0x04000000
#define KDC_OPT_POSTDATED               0x02000000
/* #define      KDC_OPT_UNUSED          0x01000000 */
#define KDC_OPT_RENEWABLE               0x00800000
/* #define      KDC_OPT_UNUSED          0x00400000 */
/* #define      KDC_OPT_RESERVED        0x00200000 */
/* #define      KDC_OPT_RESERVED        0x00100000 */
/* #define      KDC_OPT_RESERVED        0x00080000 */
/* #define      KDC_OPT_RESERVED        0x00040000 */
#define KDC_OPT_CNAME_IN_ADDL_TKT       0x00020000
#define KDC_OPT_CANONICALIZE            0x00010000
#define KDC_OPT_REQUEST_ANONYMOUS       0x00008000
/* #define      KDC_OPT_RESERVED        0x00004000 */
/* #define      KDC_OPT_RESERVED        0x00002000 */
/* #define      KDC_OPT_RESERVED        0x00001000 */
/* #define      KDC_OPT_RESERVED        0x00000800 */
/* #define      KDC_OPT_RESERVED        0x00000400 */
/* #define      KDC_OPT_RESERVED        0x00000200 */
/* #define      KDC_OPT_RESERVED        0x00000100 */
/* #define      KDC_OPT_RESERVED        0x00000080 */
/* #define      KDC_OPT_RESERVED        0x00000040 */
#define KDC_OPT_DISABLE_TRANSITED_CHECK 0x00000020
#define KDC_OPT_RENEWABLE_OK            0x00000010
#define KDC_OPT_ENC_TKT_IN_SKEY         0x00000008
/* #define      KDC_OPT_UNUSED          0x00000004 */
#define KDC_OPT_RENEW                   0x00000002
#define KDC_OPT_VALIDATE                0x00000001

/*
 * Mask of ticket flags in the TGT which should be converted into KDC
 * options when using the TGT to get derivitive tickets.
 *
 *  New mask = KDC_OPT_FORWARDABLE | KDC_OPT_PROXIABLE |
 *             KDC_OPT_ALLOW_POSTDATE | KDC_OPT_RENEWABLE
 */
#define KDC_TKT_COMMON_MASK             0x54800000

/* definitions for ap_options fields */

/** @defgroup AP_OPTS AP_OPTS
 *
 * ap_options are 32 bits; each host is responsible to put the 4 bytes
 * representing these bits into net order before transmission
 * @{
 */
#define AP_OPTS_RESERVED           0x80000000
#define AP_OPTS_USE_SESSION_KEY    0x40000000 /**< Use session key */
#define AP_OPTS_MUTUAL_REQUIRED    0x20000000 /**< Perform a mutual
                                                 authentication exchange */
#define AP_OPTS_ETYPE_NEGOTIATION  0x00000002
#define AP_OPTS_USE_SUBKEY         0x00000001 /**< Generate a subsession key
                                                 from the current session key
                                                 obtained from the
                                                 credentials */
/* #define      AP_OPTS_RESERVED        0x10000000 */
/* #define      AP_OPTS_RESERVED        0x08000000 */
/* #define      AP_OPTS_RESERVED        0x04000000 */
/* #define      AP_OPTS_RESERVED        0x02000000 */
/* #define      AP_OPTS_RESERVED        0x01000000 */
/* #define      AP_OPTS_RESERVED        0x00800000 */
/* #define      AP_OPTS_RESERVED        0x00400000 */
/* #define      AP_OPTS_RESERVED        0x00200000 */
/* #define      AP_OPTS_RESERVED        0x00100000 */
/* #define      AP_OPTS_RESERVED        0x00080000 */
/* #define      AP_OPTS_RESERVED        0x00040000 */
/* #define      AP_OPTS_RESERVED        0x00020000 */
/* #define      AP_OPTS_RESERVED        0x00010000 */
/* #define      AP_OPTS_RESERVED        0x00008000 */
/* #define      AP_OPTS_RESERVED        0x00004000 */
/* #define      AP_OPTS_RESERVED        0x00002000 */
/* #define      AP_OPTS_RESERVED        0x00001000 */
/* #define      AP_OPTS_RESERVED        0x00000800 */
/* #define      AP_OPTS_RESERVED        0x00000400 */
/* #define      AP_OPTS_RESERVED        0x00000200 */
/* #define      AP_OPTS_RESERVED        0x00000100 */
/* #define      AP_OPTS_RESERVED        0x00000080 */
/* #define      AP_OPTS_RESERVED        0x00000040 */
/* #define      AP_OPTS_RESERVED        0x00000020 */
/* #define      AP_OPTS_RESERVED        0x00000010 */
/* #define      AP_OPTS_RESERVED        0x00000008 */
/* #define      AP_OPTS_RESERVED        0x00000004 */


#define AP_OPTS_WIRE_MASK               0xfffffff0
/** @} */ /* end of AP_OPTS group */

/* definitions for ad_type fields. */
#define AD_TYPE_RESERVED        0x8000
#define AD_TYPE_EXTERNAL        0x4000
#define AD_TYPE_REGISTERED      0x2000

#define AD_TYPE_FIELD_TYPE_MASK 0x1fff

/* Ticket flags */
/* flags are 32 bits; each host is responsible to put the 4 bytes
   representing these bits into net order before transmission */
/* #define      TKT_FLG_RESERVED        0x80000000 */
#define TKT_FLG_FORWARDABLE             0x40000000
#define TKT_FLG_FORWARDED               0x20000000
#define TKT_FLG_PROXIABLE               0x10000000
#define TKT_FLG_PROXY                   0x08000000
#define TKT_FLG_MAY_POSTDATE            0x04000000
#define TKT_FLG_POSTDATED               0x02000000
#define TKT_FLG_INVALID                 0x01000000
#define TKT_FLG_RENEWABLE               0x00800000
#define TKT_FLG_INITIAL                 0x00400000
#define TKT_FLG_PRE_AUTH                0x00200000
#define TKT_FLG_HW_AUTH                 0x00100000
#define TKT_FLG_TRANSIT_POLICY_CHECKED  0x00080000
#define TKT_FLG_OK_AS_DELEGATE          0x00040000
#define TKT_FLG_ENC_PA_REP              0x00010000
#define TKT_FLG_ANONYMOUS               0x00008000
/* #define      TKT_FLG_RESERVED        0x00004000 */
/* #define      TKT_FLG_RESERVED        0x00002000 */
/* #define      TKT_FLG_RESERVED        0x00001000 */
/* #define      TKT_FLG_RESERVED        0x00000800 */
/* #define      TKT_FLG_RESERVED        0x00000400 */
/* #define      TKT_FLG_RESERVED        0x00000200 */
/* #define      TKT_FLG_RESERVED        0x00000100 */
/* #define      TKT_FLG_RESERVED        0x00000080 */
/* #define      TKT_FLG_RESERVED        0x00000040 */
/* #define      TKT_FLG_RESERVED        0x00000020 */
/* #define      TKT_FLG_RESERVED        0x00000010 */
/* #define      TKT_FLG_RESERVED        0x00000008 */
/* #define      TKT_FLG_RESERVED        0x00000004 */
/* #define      TKT_FLG_RESERVED        0x00000002 */
/* #define      TKT_FLG_RESERVED        0x00000001 */

/* definitions for lr_type fields. */
#define LR_TYPE_THIS_SERVER_ONLY        0x8000

#define LR_TYPE_INTERPRETATION_MASK     0x7fff

/* definitions for msec direction bit for KRB_SAFE, KRB_PRIV */
#define MSEC_DIRBIT             0x8000
#define MSEC_VAL_MASK           0x7fff

/*
 * end "fieldbits.h"
 */

/*
 * begin "proto.h"
 */

/** Protocol version number */
#define KRB5_PVNO       5

/* Message types */

#define KRB5_AS_REQ   ((krb5_msgtype)10) /**< Initial authentication request */
#define KRB5_AS_REP   ((krb5_msgtype)11) /**< Response to AS request */
#define KRB5_TGS_REQ  ((krb5_msgtype)12) /**< Ticket granting server request */
#define KRB5_TGS_REP  ((krb5_msgtype)13) /**< Response to TGS request */
#define KRB5_AP_REQ   ((krb5_msgtype)14) /**< Auth req to application server */
#define KRB5_AP_REP   ((krb5_msgtype)15) /**< Response to mutual AP request */
#define KRB5_SAFE     ((krb5_msgtype)20) /**< Safe application message */
#define KRB5_PRIV     ((krb5_msgtype)21) /**< Private application message */
#define KRB5_CRED     ((krb5_msgtype)22) /**< Cred forwarding message */
#define KRB5_ERROR    ((krb5_msgtype)30) /**< Error response */

/* LastReq types */
#define KRB5_LRQ_NONE                   0
#define KRB5_LRQ_ALL_LAST_TGT           1
#define KRB5_LRQ_ONE_LAST_TGT           (-1)
#define KRB5_LRQ_ALL_LAST_INITIAL       2
#define KRB5_LRQ_ONE_LAST_INITIAL       (-2)
#define KRB5_LRQ_ALL_LAST_TGT_ISSUED    3
#define KRB5_LRQ_ONE_LAST_TGT_ISSUED    (-3)
#define KRB5_LRQ_ALL_LAST_RENEWAL       4
#define KRB5_LRQ_ONE_LAST_RENEWAL       (-4)
#define KRB5_LRQ_ALL_LAST_REQ           5
#define KRB5_LRQ_ONE_LAST_REQ           (-5)
#define KRB5_LRQ_ALL_PW_EXPTIME         6
#define KRB5_LRQ_ONE_PW_EXPTIME         (-6)
#define KRB5_LRQ_ALL_ACCT_EXPTIME       7
#define KRB5_LRQ_ONE_ACCT_EXPTIME       (-7)

/* PADATA types */
#define KRB5_PADATA_NONE                0
#define KRB5_PADATA_AP_REQ              1
#define KRB5_PADATA_TGS_REQ             KRB5_PADATA_AP_REQ
#define KRB5_PADATA_ENC_TIMESTAMP       2 /**< RFC 4120 */
#define KRB5_PADATA_PW_SALT             3 /**< RFC 4120 */
#if 0                           /* Not used */
#define KRB5_PADATA_ENC_ENCKEY          4  /* Key encrypted within itself */
#endif
#define KRB5_PADATA_ENC_UNIX_TIME       5  /**< timestamp encrypted in key. RFC 4120 */
#define KRB5_PADATA_ENC_SANDIA_SECURID  6  /**< SecurId passcode. RFC 4120 */
#define KRB5_PADATA_SESAME              7  /**< Sesame project. RFC 4120 */
#define KRB5_PADATA_OSF_DCE             8  /**< OSF DCE. RFC 4120 */
#define KRB5_CYBERSAFE_SECUREID         9  /**< Cybersafe. RFC 4120 */
#define KRB5_PADATA_AFS3_SALT           10 /**< Cygnus. RFC 4120, 3961 */
#define KRB5_PADATA_ETYPE_INFO          11 /**< Etype info for preauth. RFC 4120 */
#define KRB5_PADATA_SAM_CHALLENGE       12 /**< SAM/OTP */
#define KRB5_PADATA_SAM_RESPONSE        13 /**< SAM/OTP */
#define KRB5_PADATA_PK_AS_REQ_OLD       14 /**< PKINIT */
#define KRB5_PADATA_PK_AS_REP_OLD       15 /**< PKINIT */
#define KRB5_PADATA_PK_AS_REQ           16 /**< PKINIT. RFC 4556 */
#define KRB5_PADATA_PK_AS_REP           17 /**< PKINIT. RFC 4556 */
#define KRB5_PADATA_ETYPE_INFO2         19 /**< RFC 4120 */
#define KRB5_PADATA_USE_SPECIFIED_KVNO  20 /**< RFC 4120 */
#define KRB5_PADATA_SVR_REFERRAL_INFO   20 /**< Windows 2000 referrals. RFC 6820 */
#define KRB5_PADATA_SAM_REDIRECT        21 /**< SAM/OTP. RFC 4120 */
#define KRB5_PADATA_GET_FROM_TYPED_DATA 22 /**< Embedded in typed data. RFC 4120 */
#define KRB5_PADATA_REFERRAL            25 /**< draft referral system */
#define KRB5_PADATA_SAM_CHALLENGE_2     30 /**< draft challenge system, updated */
#define KRB5_PADATA_SAM_RESPONSE_2      31 /**< draft challenge system, updated */
/* MS-KILE */
#define KRB5_PADATA_PAC_REQUEST         128 /**< include Windows PAC */
#define KRB5_PADATA_FOR_USER            129 /**< username protocol transition request */
#define KRB5_PADATA_S4U_X509_USER       130 /**< certificate protocol transition request */
#define KRB5_PADATA_AS_CHECKSUM         132 /**< AS checksum */
#define KRB5_PADATA_FX_COOKIE           133 /**< RFC 6113 */
#define KRB5_PADATA_FX_FAST             136 /**< RFC 6113 */
#define KRB5_PADATA_FX_ERROR            137 /**< RFC 6113 */
#define KRB5_PADATA_ENCRYPTED_CHALLENGE 138 /**< RFC 6113 */
#define KRB5_PADATA_OTP_CHALLENGE       141 /**< RFC 6560 section 4.1 */
#define KRB5_PADATA_OTP_REQUEST         142 /**< RFC 6560 section 4.2 */
#define KRB5_PADATA_OTP_PIN_CHANGE      144 /**< RFC 6560 section 4.3 */
#define KRB5_PADATA_PKINIT_KX           147 /**< RFC 6112 */
#define KRB5_ENCPADATA_REQ_ENC_PA_REP   149 /**< RFC 6806 */
#define KRB5_PADATA_AS_FRESHNESS        150 /**< RFC 8070 */
#define KRB5_PADATA_SPAKE               151

#define KRB5_SAM_USE_SAD_AS_KEY         0x80000000
#define KRB5_SAM_SEND_ENCRYPTED_SAD     0x40000000
#define KRB5_SAM_MUST_PK_ENCRYPT_SAD    0x20000000 /**< currently must be zero */

/** Transited encoding types */
#define KRB5_DOMAIN_X500_COMPRESS               1

/** alternate authentication types */
#define KRB5_ALTAUTH_ATT_CHALLENGE_RESPONSE     64

/* authorization data types. See RFC 4120 section 5.2.6 */

/** @defgroup KRB5_AUTHDATA KRB5_AUTHDATA
 * @{
 */
#define KRB5_AUTHDATA_IF_RELEVANT   1
#define KRB5_AUTHDATA_KDC_ISSUED    4
#define KRB5_AUTHDATA_AND_OR        5
#define KRB5_AUTHDATA_MANDATORY_FOR_KDC 8
#define KRB5_AUTHDATA_INITIAL_VERIFIED_CAS      9
#define KRB5_AUTHDATA_OSF_DCE   64
#define KRB5_AUTHDATA_SESAME    65
#define KRB5_AUTHDATA_CAMMAC    96
#define KRB5_AUTHDATA_WIN2K_PAC 128
#define KRB5_AUTHDATA_ETYPE_NEGOTIATION 129     /**< RFC 4537 */
#define KRB5_AUTHDATA_SIGNTICKET        512     /**< formerly 142 in krb5 1.8 */
#define KRB5_AUTHDATA_FX_ARMOR 71
#define KRB5_AUTHDATA_AUTH_INDICATOR 97
/** @} */ /* end of KRB5_AUTHDATA group */

/* password change constants */
#define KRB5_KPASSWD_SUCCESS            0  /**< Success */
#define KRB5_KPASSWD_MALFORMED          1  /**< Malformed request */
#define KRB5_KPASSWD_HARDERROR          2  /**< Server error */
#define KRB5_KPASSWD_AUTHERROR          3  /**< Authentication error */
#define KRB5_KPASSWD_SOFTERROR          4  /**< Password change rejected */
/* These are Microsoft's extensions in RFC 3244, and it looks like
   they'll become standardized, possibly with other additions.  */
#define KRB5_KPASSWD_ACCESSDENIED       5  /**< Not authorized */
#define KRB5_KPASSWD_BAD_VERSION        6  /**< Unknown RPC version */
/** The presented credentials were not obtained using a password directly */
#define KRB5_KPASSWD_INITIAL_FLAG_NEEDED 7

/*
 * end "proto.h"
 */

/* Time set */
/** Ticket start time, end time, and renewal duration. */
typedef struct _krb5_ticket_times {
    krb5_timestamp authtime;    /**< Time at which KDC issued the initial ticket that corresponds to this ticket */
    /* XXX ? should ktime in KDC_REP == authtime
       in ticket? otherwise client can't get this */
    krb5_timestamp starttime;   /**< optional in ticket, if not present, use @a authtime */
    krb5_timestamp endtime;     /**< Ticket expiration time */
    krb5_timestamp renew_till;  /**< Latest time at which renewal of ticket can be valid */
} krb5_ticket_times;

/** Structure for auth data */
typedef struct _krb5_authdata {
    krb5_magic magic;
    krb5_authdatatype ad_type; /**< ADTYPE */
    unsigned int length;       /**< Length of data  */
    krb5_octet *contents;      /**< Data */
} krb5_authdata;

/** Structure for transited encoding */
typedef struct _krb5_transited {
    krb5_magic magic;
    krb5_octet tr_type;     /**< Transited encoding type */
    krb5_data tr_contents;  /**< Contents */
} krb5_transited;

/** Encrypted part of ticket. */
typedef struct _krb5_enc_tkt_part {
    krb5_magic magic;
    /* to-be-encrypted portion */
    krb5_flags flags;                   /**< flags */
    krb5_keyblock *session;             /**< session key: includes enctype */
    krb5_principal client;              /**< client name/realm */
    krb5_transited transited;           /**< list of transited realms */
    krb5_ticket_times times;            /**< auth, start, end, renew_till */
    krb5_address **caddrs;              /**< array of ptrs to addresses */
    krb5_authdata **authorization_data; /**< auth data */
} krb5_enc_tkt_part;

/**
 * Ticket structure.
 *
 * The C representation of the ticket message, with a pointer to the
 * C representation of the encrypted part.
 */
typedef struct _krb5_ticket {
    krb5_magic magic;
    /* cleartext portion */
    krb5_principal server;              /**< server name/realm */
    krb5_enc_data enc_part;             /**< encryption type, kvno, encrypted encoding */
    krb5_enc_tkt_part *enc_part2;       /**< ptr to decrypted version, if available */
} krb5_ticket;

/* the unencrypted version */
/**
 * Ticket authenticator.
 *
 * The C representation of an unencrypted authenticator.
 */
typedef struct _krb5_authenticator {
    krb5_magic magic;
    krb5_principal client;              /**< client name/realm */
    krb5_checksum *checksum;            /**< checksum, includes type, optional */
    krb5_int32 cusec;                   /**< client usec portion */
    krb5_timestamp ctime;               /**< client sec portion */
    krb5_keyblock *subkey;              /**< true session key, optional */
    krb5_ui_4 seq_number;               /**< sequence #, optional */
    krb5_authdata **authorization_data; /**< authoriazation data */
} krb5_authenticator;

/** Ticket authentication data. */
typedef struct _krb5_tkt_authent {
    krb5_magic magic;
    krb5_ticket *ticket;
    krb5_authenticator *authenticator;
    krb5_flags ap_options;
} krb5_tkt_authent;

/** Credentials structure including ticket, session key, and lifetime info. */
typedef struct _krb5_creds {
    krb5_magic magic;
    krb5_principal client;              /**< client's principal identifier */
    krb5_principal server;              /**< server's principal identifier */
    krb5_keyblock keyblock;             /**< session encryption key info */
    krb5_ticket_times times;            /**< lifetime info */
    krb5_boolean is_skey;               /**< true if ticket is encrypted in
                                           another ticket's skey */
    krb5_flags ticket_flags;            /**< flags in ticket */
    krb5_address **addresses;           /**< addrs in ticket */
    krb5_data ticket;                   /**< ticket string itself */
    krb5_data second_ticket;            /**< second ticket, if related to
                                           ticket (via DUPLICATE-SKEY or
                                           ENC-TKT-IN-SKEY) */
    krb5_authdata **authdata;           /**< authorization data */
} krb5_creds;

/** Last request entry */
typedef struct _krb5_last_req_entry {
    krb5_magic magic;
    krb5_int32 lr_type;         /**< LR type */
    krb5_timestamp value;       /**< Timestamp */
} krb5_last_req_entry;

/** Pre-authentication data */
typedef struct _krb5_pa_data {
    krb5_magic magic;
    krb5_preauthtype pa_type;   /**< Preauthentication data type */
    unsigned int length;        /**< Length of data */
    krb5_octet *contents;       /**< Data */
} krb5_pa_data;

/* Don't use this; use krb5_pa_data instead. */
typedef struct _krb5_typed_data {
    krb5_magic magic;
    krb5_int32 type;
    unsigned int length;
    krb5_octet *data;
} krb5_typed_data;

/** C representation of KDC-REQ protocol message, including KDC-REQ-BODY */
typedef struct _krb5_kdc_req {
    krb5_magic magic;
    krb5_msgtype msg_type;      /**< KRB5_AS_REQ or KRB5_TGS_REQ */
    krb5_pa_data **padata;      /**< Preauthentication data */
    /* real body */
    krb5_flags kdc_options;     /**< Requested options */
    krb5_principal client;      /**< Client principal and realm */
    krb5_principal server;      /**< Server principal and realm */
    krb5_timestamp from;        /**< Requested start time */
    krb5_timestamp till;        /**< Requested end time */
    krb5_timestamp rtime;       /**< Requested renewable end time */
    krb5_int32 nonce;           /**< Nonce to match request and response */
    int nktypes;                /**< Number of enctypes */
    krb5_enctype *ktype;        /**< Requested enctypes */
    krb5_address **addresses;   /**< Requested addresses (optional) */
    krb5_enc_data authorization_data;  /**< Encrypted authz data (optional) */
    krb5_authdata **unenc_authdata;    /**< Unencrypted authz data */
    krb5_ticket **second_ticket;       /**< Second ticket array (optional) */
} krb5_kdc_req;

/**
 * C representation of @c EncKDCRepPart protocol message.
 *
 * This is the cleartext message that is encrypted and inserted in @c KDC-REP.
 */
typedef struct _krb5_enc_kdc_rep_part {
    krb5_magic magic;
    /* encrypted part: */
    krb5_msgtype msg_type;           /**< krb5 message type */
    krb5_keyblock *session;          /**< Session key */
    krb5_last_req_entry **last_req;  /**< Array of pointers to entries */
    krb5_int32 nonce;                /**< Nonce from request */
    krb5_timestamp key_exp;          /**< Expiration date */
    krb5_flags flags;                /**< Ticket flags */
    krb5_ticket_times times;         /**< Lifetime info */
    krb5_principal server;           /**< Server's principal identifier */
    krb5_address **caddrs;           /**< Array of ptrs to addrs, optional */
    krb5_pa_data **enc_padata;       /**< Encrypted preauthentication data */
} krb5_enc_kdc_rep_part;

/** Representation of the @c KDC-REP protocol message. */
typedef struct _krb5_kdc_rep {
    krb5_magic magic;
    /* cleartext part: */
    krb5_msgtype msg_type;            /**< KRB5_AS_REP or KRB5_KDC_REP */
    krb5_pa_data **padata;            /**< Preauthentication data from KDC */
    krb5_principal client;            /**< Client principal and realm */
    krb5_ticket *ticket;              /**< Ticket */
    krb5_enc_data enc_part;           /**< Encrypted part of reply */
    krb5_enc_kdc_rep_part *enc_part2; /**< Unencrypted version, if available */
} krb5_kdc_rep;

/** Error message structure */
typedef struct _krb5_error {
    krb5_magic magic;
    /* some of these may be meaningless in certain contexts */
    krb5_timestamp ctime;       /**< Client sec portion; optional */
    krb5_int32 cusec;           /**< Client usec portion; optional */
    krb5_int32 susec;           /**< Server usec portion */
    krb5_timestamp stime;       /**< Server sec portion */
    krb5_ui_4 error;            /**< Error code (protocol error #'s) */
    krb5_principal client;      /**< Client principal and realm */
    krb5_principal server;      /**< Server principal and realm */
    krb5_data text;             /**< Descriptive text */
    krb5_data e_data;           /**< Additional error-describing data */
} krb5_error;

/** Authentication header. */
typedef struct _krb5_ap_req {
    krb5_magic magic;
    krb5_flags ap_options;        /**< Requested options */
    krb5_ticket *ticket;          /**< Ticket */
    krb5_enc_data authenticator;  /**< Encrypted authenticator */
} krb5_ap_req;

/**
 * C representaton of AP-REP message.
 *
 * The server's response to a client's request for mutual authentication.
 */
typedef struct _krb5_ap_rep {
    krb5_magic magic;
    krb5_enc_data enc_part;     /**< Ciphertext of ApRepEncPart */
} krb5_ap_rep;

/** Cleartext that is encrypted and put into @c _krb5_ap_rep.  */
typedef struct _krb5_ap_rep_enc_part {
    krb5_magic magic;
    krb5_timestamp ctime;       /**< Client time, seconds portion */
    krb5_int32 cusec;           /**< Client time, microseconds portion */
    krb5_keyblock *subkey;      /**< Subkey (optional) */
    krb5_ui_4 seq_number;       /**< Sequence number */
} krb5_ap_rep_enc_part;

/* Unused */
typedef struct _krb5_response {
    krb5_magic magic;
    krb5_octet message_type;
    krb5_data response;
    krb5_int32 expected_nonce;
    krb5_timestamp request_time;
} krb5_response;

/** Credentials information inserted into @c EncKrbCredPart. */
typedef struct _krb5_cred_info {
    krb5_magic magic;
    krb5_keyblock *session;     /**< Session key used to encrypt ticket */
    krb5_principal client;      /**< Client principal and realm */
    krb5_principal server;      /**< Server principal and realm */
    krb5_flags flags;           /**< Ticket flags */
    krb5_ticket_times times;    /**< Auth, start, end, renew_till */
    krb5_address **caddrs;      /**< Array of pointers to addrs (optional) */
} krb5_cred_info;

/** Cleartext credentials information.  */
typedef struct _krb5_cred_enc_part {
    krb5_magic magic;
    krb5_int32 nonce;           /**< Nonce (optional) */
    krb5_timestamp timestamp;   /**< Generation time, seconds portion */
    krb5_int32 usec;            /**< Generation time, microseconds portion */
    krb5_address *s_address;    /**< Sender address (optional) */
    krb5_address *r_address;    /**< Recipient address (optional) */
    krb5_cred_info **ticket_info;
} krb5_cred_enc_part;

/** Credentials data structure.*/
typedef struct _krb5_cred {
    krb5_magic magic;
    krb5_ticket **tickets;          /**< Tickets */
    krb5_enc_data enc_part;         /**< Encrypted part */
    krb5_cred_enc_part *enc_part2;  /**< Unencrypted version, if available */
} krb5_cred;

/* Unused, but here for API compatibility. */
typedef struct _passwd_phrase_element {
    krb5_magic magic;
    krb5_data *passwd;
    krb5_data *phrase;
} passwd_phrase_element;

/* Unused, but here for API compatibility. */
typedef struct _krb5_pwd_data {
    krb5_magic magic;
    int sequence_count;
    passwd_phrase_element **element;
} krb5_pwd_data;

/* Unused, but here for API compatibility. */
typedef struct _krb5_pa_svr_referral_data {
    /** Referred name, only realm is required */
    krb5_principal     principal;
} krb5_pa_svr_referral_data;

/* Unused, but here for API compatibility. */
typedef struct _krb5_pa_server_referral_data {
    krb5_data          *referred_realm;
    krb5_principal     true_principal_name;
    krb5_principal     requested_principal_name;
    krb5_timestamp     referral_valid_until;
    krb5_checksum      rep_cksum;
} krb5_pa_server_referral_data;

typedef struct _krb5_pa_pac_req {
    /** TRUE if a PAC should be included in TGS-REP */
    krb5_boolean       include_pac;
} krb5_pa_pac_req;

/*
 * begin "safepriv.h"
 */

/** @defgroup KRB5_AUTH_CONTEXT KRB5_AUTH_CONTEXT
 * @{
 */
/** Prevent replays with timestamps and replay cache. */
#define KRB5_AUTH_CONTEXT_DO_TIME       0x00000001
/** Save timestamps for application. */
#define KRB5_AUTH_CONTEXT_RET_TIME      0x00000002
/** Prevent replays with sequence numbers. */
#define KRB5_AUTH_CONTEXT_DO_SEQUENCE   0x00000004
/** Save sequence numbers for application. */
#define KRB5_AUTH_CONTEXT_RET_SEQUENCE  0x00000008
#define KRB5_AUTH_CONTEXT_PERMIT_ALL    0x00000010
#define KRB5_AUTH_CONTEXT_USE_SUBKEY    0x00000020
/** @} */ /* end of KRB5_AUTH_CONTEXT group */

/**
 * Replay data.
 *
 * Sequence number and timestamp information output by krb5_rd_priv() and
 * krb5_rd_safe().
 */
typedef struct krb5_replay_data {
    krb5_timestamp      timestamp;  /**< Timestamp, seconds portion */
    krb5_int32          usec;       /**< Timestamp, microseconds portion */
    krb5_ui_4           seq;        /**< Sequence number  */
} krb5_replay_data;

/* Flags for krb5_auth_con_genaddrs(). */

/** Generate the local network address. */
#define KRB5_AUTH_CONTEXT_GENERATE_LOCAL_ADDR       0x00000001
/** Generate the remote network address.  */
#define KRB5_AUTH_CONTEXT_GENERATE_REMOTE_ADDR      0x00000002
/** Generate the local network address and the local port. */
#define KRB5_AUTH_CONTEXT_GENERATE_LOCAL_FULL_ADDR  0x00000004
/** Generate the remote network address and the remote port. */
#define KRB5_AUTH_CONTEXT_GENERATE_REMOTE_FULL_ADDR 0x00000008

/** Type of function used as a callback to generate checksum data for mk_req */
typedef krb5_error_code
(KRB5_CALLCONV * krb5_mk_req_checksum_func)(krb5_context, krb5_auth_context,
                                            void *, krb5_data **);

/*
 * end "safepriv.h"
 */


/*
 * begin "ccache.h"
 */

/** Cursor for sequential lookup */
typedef krb5_pointer    krb5_cc_cursor;

struct _krb5_ccache;
typedef struct _krb5_ccache *krb5_ccache;
struct _krb5_cc_ops;
typedef struct _krb5_cc_ops krb5_cc_ops;

struct _krb5_cccol_cursor;
/** Cursor for iterating over all ccaches */
typedef struct _krb5_cccol_cursor *krb5_cccol_cursor;

/* Flags for krb5_cc_retrieve_cred. */
/** The requested lifetime must be at least as great as the time specified. */
#define KRB5_TC_MATCH_TIMES        0x00000001
/** The is_skey field must match exactly. */
#define KRB5_TC_MATCH_IS_SKEY      0x00000002
/** All the flags set in the match credentials must be set. */
#define KRB5_TC_MATCH_FLAGS        0x00000004
/** All the time fields must match exactly. */
#define KRB5_TC_MATCH_TIMES_EXACT  0x00000008
/** All the flags must match exactly. */
#define KRB5_TC_MATCH_FLAGS_EXACT  0x00000010
/** The authorization data must match. */
#define KRB5_TC_MATCH_AUTHDATA     0x00000020
/** Only the name portion of the principal name must match. */
#define KRB5_TC_MATCH_SRV_NAMEONLY 0x00000040
/** The second ticket must match. */
#define KRB5_TC_MATCH_2ND_TKT      0x00000080
/** The encryption key type must match. */
#define KRB5_TC_MATCH_KTYPE        0x00000100
/** The supported key types must match. */
#define KRB5_TC_SUPPORTED_KTYPES   0x00000200

/* Flags for krb5_cc_set_flags and similar. */
/** Open and close the file for each cache operation. */
#define KRB5_TC_OPENCLOSE          0x00000001 /**< @deprecated has no effect */
#define KRB5_TC_NOTICKET           0x00000002

/**
 * Retrieve the name, but not type of a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 *
 * @warning Returns the name of the credential cache.  The result is an alias
 * into @a cache and should not be freed or modified by the caller.  This name
 * does not include the cache type, so should not be used as input to
 * krb5_cc_resolve().
 *
 * @return
 * On success - the name of the credential cache.
 */
const char * KRB5_CALLCONV
krb5_cc_get_name(krb5_context context, krb5_ccache cache);

/**
 * Retrieve the full name of a credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  cache           Credential cache handle
 * @param [out] fullname_out    Full name of cache
 *
 * Use krb5_free_string() to free @a fullname_out when it is no longer needed.
 *
 * @version New in 1.10
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_get_full_name(krb5_context context, krb5_ccache cache,
                      char **fullname_out);

#if KRB5_DEPRECATED
krb5_error_code KRB5_CALLCONV
krb5_cc_gen_new(krb5_context context, krb5_ccache *cache);
#endif /* KRB5_DEPRECATED */

/**
 * Initialize a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 * @param [in] principal        Default principal name
 *
 * Destroy any existing contents of @a cache and initialize it for the default
 * principal @a principal.
 *
 * @retval
 *  0  Success
 * @return
 *  System errors; Permission errors; Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_initialize(krb5_context context, krb5_ccache cache,
                   krb5_principal principal);

/**
 * Destroy a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 *
 * This function destroys any existing contents of @a cache and closes the
 * handle to it.
 *
 * @retval
 * 0  Success
 * @return
 * Permission errors
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_destroy(krb5_context context, krb5_ccache cache);

/**
 * Close a credential cache handle.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 *
 * This function closes a credential cache handle @a cache without affecting
 * the contents of the cache.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_close(krb5_context context, krb5_ccache cache);

/**
 * Store credentials in a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 * @param [in] creds            Credentials to be stored in cache
 *
 * This function stores @a creds into @a cache.  If @a creds->server and the
 * server in the decoded ticket @a creds->ticket differ, the credentials will
 * be stored under both server principal names.
 *
 * @retval
 *  0  Success
 * @return Permission errors; storage failure errors; Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_store_cred(krb5_context context, krb5_ccache cache, krb5_creds *creds);

/**
 * Retrieve a specified credentials from a credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  cache           Credential cache handle
 * @param [in]  flags           Flags bit mask
 * @param [in]  mcreds          Credentials to match
 * @param [out] creds           Credentials matching the requested value
 *
 * This function searches a credential cache for credentials matching @a mcreds
 * and returns it if found.
 *
 * Valid values for @a flags are:
 *
 * @li #KRB5_TC_MATCH_TIMES        The requested lifetime must be at least as
 *                                 great as in @a mcreds .
 * @li #KRB5_TC_MATCH_IS_SKEY      The @a is_skey field much match exactly.
 * @li #KRB5_TC_MATCH_FLAGS        Flags set in @a mcreds must be set.
 * @li #KRB5_TC_MATCH_TIMES_EXACT  The requested lifetime must match exactly.
 * @li #KRB5_TC_MATCH_FLAGS_EXACT  Flags must match exactly.
 * @li #KRB5_TC_MATCH_AUTHDATA     The authorization data must match.
 * @li #KRB5_TC_MATCH_SRV_NAMEONLY Only the name portion of the principal
 *                                 name must match, not the realm.
 * @li #KRB5_TC_MATCH_2ND_TKT      The second tickets must match.
 * @li #KRB5_TC_MATCH_KTYPE        The encryption key types must match.
 * @li #KRB5_TC_SUPPORTED_KTYPES   Check all matching entries that have any
 *                                 supported encryption type and return the
 *                                 one with the encryption type listed earliest.
 *
 * Use krb5_free_cred_contents() to free @a creds when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_retrieve_cred(krb5_context context, krb5_ccache cache,
                      krb5_flags flags, krb5_creds *mcreds,
                      krb5_creds *creds);

/**
 * Get the default principal of a credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  cache           Credential cache handle
 * @param [out] principal       Primary principal
 *
 * Returns the default client principal of a credential cache as set by
 * krb5_cc_initialize().
 *
 * Use krb5_free_principal() to free @a principal when it is no longer needed.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_get_principal(krb5_context context, krb5_ccache cache,
                      krb5_principal *principal);

/**
 * Prepare to sequentially read every credential in a credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  cache           Credential cache handle
 * @param [out] cursor          Cursor
 *
 * krb5_cc_end_seq_get() must be called to complete the retrieve operation.
 *
 * @note If @a cache is modified between the time of the call to this function
 * and the time of the final krb5_cc_end_seq_get(), the results are undefined.
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_start_seq_get(krb5_context context, krb5_ccache cache,
                      krb5_cc_cursor *cursor);

/**
 * Retrieve the next entry from the credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  cache           Credential cache handle
 * @param [in]  cursor          Cursor
 * @param [out] creds           Next credential cache entry
 *
 * This function fills in @a creds with the next entry in @a cache and advances
 * @a cursor.
 *
 * Use krb5_free_cred_contents() to free @a creds when it is no longer needed.
 *
 * @sa krb5_cc_start_seq_get(), krb5_end_seq_get()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_next_cred(krb5_context context, krb5_ccache cache,
                  krb5_cc_cursor *cursor, krb5_creds *creds);

/**
 * Finish a series of sequential processing credential cache entries.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 * @param [in] cursor           Cursor
 *
 * This function finishes processing credential cache entries and invalidates
 * @a cursor.
 *
 * @sa krb5_cc_start_seq_get(), krb5_cc_next_cred()
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_end_seq_get(krb5_context context, krb5_ccache cache,
                    krb5_cc_cursor *cursor);

/**
 * Remove credentials from a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 * @param [in] flags            Bitwise-ORed search flags
 * @param [in] creds            Credentials to be matched
 *
 * @warning This function is not implemented for some cache types.
 *
 * This function accepts the same flag values as krb5_cc_retrieve_cred().
 *
 * @retval KRB5_CC_NOSUPP Not implemented for this cache type
 * @return No matches found; Data cannot be deleted; Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_remove_cred(krb5_context context, krb5_ccache cache, krb5_flags flags,
                    krb5_creds *creds);

/**
 * Set options flags on a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 * @param [in] flags            Flag bit mask
 *
 * This function resets @a cache flags to @a flags.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_set_flags(krb5_context context, krb5_ccache cache, krb5_flags flags);

/**
 * Retrieve flags from a credential cache structure.
 *
 * @param [in]  context         Library context
 * @param [in]  cache           Credential cache handle
 * @param [out] flags           Flag bit mask
 *
 * @warning For memory credential cache always returns a flag mask of 0.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_get_flags(krb5_context context, krb5_ccache cache, krb5_flags *flags);

/**
 * Retrieve the type of a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 *
 * @return The type of a credential cache as an alias that must not be modified
 * or freed by the caller.
 */
const char * KRB5_CALLCONV
krb5_cc_get_type(krb5_context context, krb5_ccache cache);

/**
 * Move a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] src              The credential cache to move the content from
 * @param [in] dst              The credential cache to move the content to
 *
 * This function reinitializes @a dst and populates it with the credentials and
 * default principal of @a src; then, if successful, destroys @a src.
 *
 * @retval
 * 0 Success; @a src is closed.
 * @return
 * Kerberos error codes; @a src is still allocated.
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_move(krb5_context context, krb5_ccache src, krb5_ccache dst);

/**
 * Return a timestamp of the last modification to a credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  ccache          Credential cache handle
 * @param [out] change_time     The last change time of @a ccache
 *
 * If an error occurs, @a change_time is set to 0.
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_last_change_time(krb5_context context, krb5_ccache ccache,
                         krb5_timestamp *change_time);

/**
 * Lock a credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  ccache          Credential cache handle
 *
 * Use krb5_cc_unlock() to unlock the lock.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_lock(krb5_context context, krb5_ccache ccache);

/**
 * Unlock a credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  ccache          Credential cache handle
 *
 * This function unlocks the @a ccache locked by krb5_cc_lock().
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_unlock(krb5_context context, krb5_ccache ccache);

/**
 * Prepare to iterate over the collection of known credential caches.
 *
 * @param [in]  context         Library context
 * @param [out] cursor          Cursor
 *
 * Get a new cache iteration @a cursor that will iterate over all known
 * credential caches independent of type.
 *
 * Use krb5_cccol_cursor_free() to release @a cursor when it is no longer
 * needed.
 *
 * @sa krb5_cccol_cursor_next()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cccol_cursor_new(krb5_context context, krb5_cccol_cursor *cursor);

/**
 * Get the next credential cache in the collection.
 *
 * @param [in]  context         Library context
 * @param [in]  cursor          Cursor
 * @param [out] ccache          Credential cache handle
 *
 * @note When all caches are iterated over and the end of the list is reached,
 * @a ccache is set to NULL.
 *
 * Use krb5_cc_close() to close @a ccache when it is no longer needed.
 *
 * @sa krb5_cccol_cursor_new(), krb5_cccol_cursor_free()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cccol_cursor_next(krb5_context context, krb5_cccol_cursor cursor,
                       krb5_ccache *ccache);

/**
 * Free a credential cache collection cursor.
 *
 * @param [in] context          Library context
 * @param [in] cursor           Cursor
 *
 * @sa krb5_cccol_cursor_new(), krb5_cccol_cursor_next()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cccol_cursor_free(krb5_context context, krb5_cccol_cursor *cursor);

/**
 * Check if the credential cache collection contains any credentials.
 *
 * @param [in]  context         Library context
 *
 * @version New in 1.11
 *
 * @retval 0 Credentials are available in the collection
 * @retval KRB5_CC_NOTFOUND The collection contains no credentials
 */
krb5_error_code KRB5_CALLCONV
krb5_cccol_have_content(krb5_context context);

/**
 * Return a timestamp of the last modification of any known credential cache.
 *
 * @param [in]  context         Library context
 * @param [out] change_time     Last modification timestamp
 *
 * This function returns the most recent modification time of any known
 * credential cache, ignoring any caches which cannot supply a last
 * modification time.
 *
 * If there are no known credential caches, @a change_time is set to 0.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cccol_last_change_time(krb5_context context, krb5_timestamp *change_time);

/**
 * Acquire a global lock for credential caches.
 *
 * @param [in]  context         Library context
 *
 * This function locks the global credential cache collection, ensuring
 * that no ccaches are added to or removed from it until the collection
 * lock is released.
 *
 * Use krb5_cccol_unlock() to unlock the lock.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */

krb5_error_code KRB5_CALLCONV
krb5_cccol_lock(krb5_context context);

/**
 * Release a global lock for credential caches.
 *
 * @param [in]  context         Library context
 *
 * This function unlocks the lock from krb5_cccol_lock().
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cccol_unlock(krb5_context context);

/**
 * Create a new credential cache of the specified type with a unique name.
 *
 * @param [in]  context         Library context
 * @param [in]  type            Credential cache type name
 * @param [in]  hint            Unused
 * @param [out] id              Credential cache handle
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_new_unique(krb5_context context, const char *type, const char *hint,
                   krb5_ccache *id);

/*
 * end "ccache.h"
 */

/*
 * begin "rcache.h"
 */

struct krb5_rc_st;
typedef struct krb5_rc_st *krb5_rcache;

/*
 * end "rcache.h"
 */

/*
 * begin "keytab.h"
 */


/* XXX */
#define MAX_KEYTAB_NAME_LEN 1100 /**< Long enough for MAXPATHLEN + some extra */

typedef krb5_pointer krb5_kt_cursor;

/** A key table entry. */
typedef struct krb5_keytab_entry_st {
    krb5_magic magic;
    krb5_principal principal;   /**< Principal of this key */
    krb5_timestamp timestamp;   /**< Time entry written to keytable */
    krb5_kvno vno;              /**< Key version number */
    krb5_keyblock key;          /**< The secret key */
} krb5_keytab_entry;

struct _krb5_kt;
typedef struct _krb5_kt *krb5_keytab;

/**
 * Return the type of a key table.
 *
 * @param [in] context          Library context
 * @param [in] keytab           Key table handle
 *
 * @return The type of a key table as an alias that must not be modified or
 * freed by the caller.
 */
const char * KRB5_CALLCONV
krb5_kt_get_type(krb5_context context, krb5_keytab keytab);

/**
 * Get a key table name.
 *
 * @param [in]  context         Library context
 * @param [in]  keytab          Key table handle
 * @param [out] name            Key table name
 * @param [in]  namelen         Maximum length to fill in name
 *
 * Fill @a name with the name of @a keytab including the type and delimiter.
 *
 * @sa MAX_KEYTAB_NAME_LEN
 *
 * @retval
 * 0 Success
 * @retval
 * KRB5_KT_NAME_TOOLONG  Key table name does not fit in @a namelen bytes
 *
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_get_name(krb5_context context, krb5_keytab keytab, char *name,
                 unsigned int namelen);

/**
 * Close a key table handle.
 *
 * @param [in] context          Library context
 * @param [in] keytab           Key table handle
 *
 * @retval 0
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_close(krb5_context context, krb5_keytab keytab);

/**
 * Get an entry from a key table.
 *
 * @param [in]  context         Library context
 * @param [in]  keytab          Key table handle
 * @param [in]  principal       Principal name
 * @param [in]  vno             Key version number (0 for highest available)
 * @param [in]  enctype         Encryption type (0 zero for any enctype)
 * @param [out] entry           Returned entry from key table
 *
 * Retrieve an entry from a key table which matches the @a keytab, @a
 * principal, @a vno, and @a enctype.  If @a vno is zero, retrieve the
 * highest-numbered kvno matching the other fields.  If @a enctype is 0, match
 * any enctype.
 *
 * Use krb5_free_keytab_entry_contents() to free @a entry when it is no longer
 * needed.
 *
 * @note If @a vno is zero, the function retrieves the highest-numbered-kvno
 * entry that matches the specified principal.
 *
 * @retval
 * 0 Success
 * @retval
 * Kerberos error codes on failure
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_get_entry(krb5_context context, krb5_keytab keytab,
                  krb5_const_principal principal, krb5_kvno vno,
                  krb5_enctype enctype, krb5_keytab_entry *entry);

/**
 * Start a sequential retrieval of key table entries.
 *
 * @param [in]  context         Library context
 * @param [in]  keytab          Key table handle
 * @param [out] cursor          Cursor
 *
 * Prepare to read sequentially every key in the specified key table.  Use
 * krb5_kt_end_seq_get() to release the cursor when it is no longer needed.
 *
 * @sa krb5_kt_next_entry(), krb5_kt_end_seq_get()
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_start_seq_get(krb5_context context, krb5_keytab keytab,
                      krb5_kt_cursor *cursor);

/**
 * Retrieve the next entry from the key table.
 *
 * @param [in]  context         Library context
 * @param [in]  keytab          Key table handle
 * @param [out] entry           Returned key table entry
 * @param [in]  cursor          Key table cursor
 *
 * Return the next sequential entry in @a keytab and advance @a cursor.
 * Callers must release the returned entry with krb5_kt_free_entry().
 *
 * @sa krb5_kt_start_seq_get(), krb5_kt_end_seq_get()
 *
 * @retval
 * 0 Success
 * @retval
 * KRB5_KT_END - if the last entry was reached
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_next_entry(krb5_context context, krb5_keytab keytab,
                   krb5_keytab_entry *entry, krb5_kt_cursor *cursor);

/**
 * Release a keytab cursor.
 *
 * @param [in]  context         Library context
 * @param [in]  keytab          Key table handle
 * @param [out] cursor          Cursor
 *
 * This function should be called to release the cursor created by
 * krb5_kt_start_seq_get().
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_end_seq_get(krb5_context context, krb5_keytab keytab,
                    krb5_kt_cursor *cursor);

/**
 * Check if a keytab exists and contains entries.
 *
 * @param [in]  context         Library context
 * @param [in]  keytab          Key table handle
 *
 * @version New in 1.11
 *
 * @retval 0 Keytab exists and contains entries
 * @retval KRB5_KT_NOTFOUND Keytab does not contain entries
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_have_content(krb5_context context, krb5_keytab keytab);

/*
 * end "keytab.h"
 */

/*
 * begin "func-proto.h"
 */

#define KRB5_INIT_CONTEXT_SECURE 0x1 /**< Use secure context configuration */
#define KRB5_INIT_CONTEXT_KDC    0x2 /**< Use KDC configuration if available */

/**
 * Create a krb5 library context.
 *
 * @param [out] context         Library context
 *
 * The @a context must be released by calling krb5_free_context() when
 * it is no longer needed.
 *
 * @warning Any program or module that needs the Kerberos code to not trust the
 * environment must use krb5_init_secure_context(), or clean out the
 * environment.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_context(krb5_context *context);

/**
 * Create a krb5 library context using only configuration files.
 *
 * @param [out] context         Library context
 *
 * Create a context structure, using only system configuration files.  All
 * information passed through the environment variables is ignored.
 *
 * The @a context must be released by calling krb5_free_context() when
 * it is no longer needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_secure_context(krb5_context *context);

/**
 * Create a krb5 library context using a specified profile.
 *
 * @param [in]  profile         Profile object (NULL to create default profile)
 * @param [in]  flags           Context initialization flags
 * @param [out] context         Library context
 *
 * Create a context structure, optionally using a specified profile and
 * initialization flags.  If @a profile is NULL, the default profile will be
 * created from config files.  If @a profile is non-null, a copy of it will be
 * made for the new context; the caller should still clean up its copy.  Valid
 * flag values are:
 *
 * @li #KRB5_INIT_CONTEXT_SECURE Ignore environment variables
 * @li #KRB5_INIT_CONTEXT_KDC    Use KDC configuration if creating profile
 */
krb5_error_code KRB5_CALLCONV
krb5_init_context_profile(struct _profile_t *profile, krb5_flags flags,
                          krb5_context *context);

/**
 * Free a krb5 library context.
 *
 * @param [in] context          Library context
 *
 * This function frees a @a context that was created by krb5_init_context()
 * or krb5_init_secure_context().
 */
void KRB5_CALLCONV
krb5_free_context(krb5_context context);

/**
 * Copy a krb5_context structure.
 *
 * @param [in]  ctx             Library context
 * @param [out] nctx_out        New context structure
 *
 * The newly created context must be released by calling krb5_free_context()
 * when it is no longer needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_context(krb5_context ctx, krb5_context *nctx_out);

/**
 * Set default TGS encryption types in a krb5_context structure.
 *
 * @param [in] context          Library context
 * @param [in] etypes           Encryption type(s) to set
 *
 * This function sets the default enctype list for TGS requests
 * made using @a context to @a etypes.
 *
 * @note This overrides the default list (from config file or built-in).
 *
 * @retval
 *  0    Success
 * @retval
 *  KRB5_PROG_ETYPE_NOSUPP Program lacks support for encryption type
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_set_default_tgs_enctypes(krb5_context context, const krb5_enctype *etypes);

/**
 * Return a list of encryption types permitted for session keys.
 *
 * @param [in]  context         Library context
 * @param [out] ktypes          Zero-terminated list of encryption types
 *
 * This function returns the list of encryption types permitted for session
 * keys within @a context, as determined by configuration or by a previous call
 * to krb5_set_default_tgs_enctypes().
 *
 * Use krb5_free_enctypes() to free @a ktypes when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_permitted_enctypes(krb5_context context, krb5_enctype **ktypes);

/**
 * Test whether the Kerberos library was built with multithread support.
 *
 * @retval
 * TRUE if the library is threadsafe; FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_is_thread_safe(void);

/* libkrb.spec */

/**
 * Decrypt a ticket using the specified key table.
 *
 * @param [in] context          Library context
 * @param [in] kt               Key table
 * @param [in] ticket           Ticket to be decrypted
 *
 * This function takes a @a ticket as input and decrypts it using
 * key data from @a kt.  The result is placed into @a ticket->enc_part2.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_server_decrypt_ticket_keytab(krb5_context context, const krb5_keytab kt,
                                  krb5_ticket *ticket);

/**
 * Free an array of credential structures.
 *
 * @param [in] context          Library context
 * @param [in] tgts             Null-terminated array of credentials to free
 *
 * @note The last entry in the array @a tgts must be a NULL pointer.
 */
void KRB5_CALLCONV
krb5_free_tgt_creds(krb5_context context, krb5_creds **tgts);

/** @defgroup KRB5_GC  KRB5_GC
 * @{
 */
#define KRB5_GC_USER_USER    1  /**< Want user-user ticket */
#define KRB5_GC_CACHED       2  /**< Want cached ticket only */
#define KRB5_GC_CANONICALIZE 4  /**< Set canonicalize KDC option */
#define KRB5_GC_NO_STORE     8  /**< Do not store in credential cache */
#define KRB5_GC_FORWARDABLE             16  /**< Acquire forwardable tickets */
#define KRB5_GC_NO_TRANSIT_CHECK        32  /**< Disable transited check */
#define KRB5_GC_CONSTRAINED_DELEGATION  64  /**< Constrained delegation */
/** @} */ /* end of KRB5_GC group */

/**
 * Get an additional ticket.
 *
 * @param [in]  context         Library context
 * @param [in]  options         Options
 * @param [in]  ccache          Credential cache handle
 * @param [in]  in_creds        Input credentials
 * @param [out] out_creds       Output updated credentials
 *
 * Use @a ccache or a TGS exchange to get a service ticket matching @a
 * in_creds.
 *
 * Valid values for @a options are:
 * @li #KRB5_GC_CACHED     Search only credential cache for the ticket
 * @li #KRB5_GC_USER_USER  Return a user to user authentication ticket
 *
 * @a in_creds must be non-null.  @a in_creds->client and @a in_creds->server
 * must be filled in to specify the client and the server respectively.  If any
 * authorization data needs to be requested for the service ticket (such as
 * restrictions on how the ticket can be used), specify it in @a
 * in_creds->authdata; otherwise set @a in_creds->authdata to NULL.  The
 * session key type is specified in @a in_creds->keyblock.enctype, if it is
 * nonzero.
 *
 * The expiration date is specified in @a in_creds->times.endtime.
 * The KDC may return tickets with an earlier expiration date.
 * If @a in_creds->times.endtime is set to 0, the latest possible
 * expiration date will be requested.
 *
 * Any returned ticket and intermediate ticket-granting tickets are stored
 * in @a ccache.
 *
 * Use krb5_free_creds() to free @a out_creds when it is no longer needed.
 *
 * @retval
 *  0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_credentials(krb5_context context, krb5_flags options,
                     krb5_ccache ccache, krb5_creds *in_creds,
                     krb5_creds **out_creds);

/** @deprecated Replaced by krb5_get_validated_creds. */
krb5_error_code KRB5_CALLCONV
krb5_get_credentials_validate(krb5_context context, krb5_flags options,
                              krb5_ccache ccache, krb5_creds *in_creds,
                              krb5_creds **out_creds);

/** @deprecated Replaced by krb5_get_renewed_creds. */
krb5_error_code KRB5_CALLCONV
krb5_get_credentials_renew(krb5_context context, krb5_flags options,
                           krb5_ccache ccache, krb5_creds *in_creds,
                           krb5_creds **out_creds);

/**
 * Create a @c KRB_AP_REQ message.
 *
 * @param [in]     context        Library context
 * @param [in,out] auth_context   Pre-existing or newly created auth context
 * @param [in]     ap_req_options @ref AP_OPTS options
 * @param [in]     service        Service name, or NULL to use @c "host"
 * @param [in]     hostname       Host name, or NULL to use local hostname
 * @param [in]     in_data        Application data to be checksummed in the
 *                                authenticator, or NULL
 * @param [in]     ccache         Credential cache used to obtain credentials
 *                                for the desired service.
 * @param [out]    outbuf         @c AP-REQ message
 *
 * This function is similar to krb5_mk_req_extended() except that it uses a
 * given @a hostname, @a service, and @a ccache to construct a service
 * principal name and obtain credentials.
 *
 * Use krb5_free_data_contents() to free @a outbuf when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_req(krb5_context context, krb5_auth_context *auth_context,
            krb5_flags ap_req_options, const char *service,
            const char *hostname, krb5_data *in_data, krb5_ccache ccache,
            krb5_data *outbuf);

/**
 * Create a @c KRB_AP_REQ message using supplied credentials.
 *
 * @param [in]     context        Library context
 * @param [in,out] auth_context   Pre-existing or newly created auth context
 * @param [in]     ap_req_options @ref AP_OPTS options
 * @param [in]     in_data        Application data to be checksummed in the
 *                                authenticator, or NULL
 * @param [in]     in_creds       Credentials for the service with valid ticket
 *                                and key
 * @param [out]    outbuf         @c AP-REQ message
 *
 * Valid @a ap_req_options are:
 * @li #AP_OPTS_USE_SESSION_KEY - Use the session key when creating the
 *                                request used for user to user
 *                                authentication.
 * @li #AP_OPTS_MUTUAL_REQUIRED - Request a mutual authentication packet from
 *                                the reciever.
 * @li #AP_OPTS_USE_SUBKEY      - Generate a subsession key from the current
 *                                session key obtained from the credentials.
 *
 * This function creates a KRB_AP_REQ message using supplied credentials @a
 * in_creds.  @a auth_context may point to an existing auth context or to NULL,
 * in which case a new one will be created.  If @a in_data is non-null, a
 * checksum of it will be included in the authenticator contained in the
 * KRB_AP_REQ message.  Use krb5_free_data_contents() to free @a outbuf when it
 * is no longer needed.
 *
 * On successful return, the authenticator is stored in @a auth_context with
 * the @a client and @a checksum fields nulled out.  (This is to prevent
 * pointer-sharing problems; the caller should not need these fields anyway,
 * since the caller supplied them.)
 *
 * @sa krb5_mk_req()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_req_extended(krb5_context context, krb5_auth_context *auth_context,
                     krb5_flags ap_req_options, krb5_data *in_data,
                     krb5_creds *in_creds, krb5_data *outbuf);

/**
 * Format and encrypt a @c KRB_AP_REP message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] outbuf          @c AP-REP message
 *
 * This function fills in @a outbuf with an AP-REP message using information
 * from @a auth_context.
 *
 * If the flags in @a auth_context indicate that a sequence number should be
 * used (either #KRB5_AUTH_CONTEXT_DO_SEQUENCE or
 * #KRB5_AUTH_CONTEXT_RET_SEQUENCE) and the local sequence number in @a
 * auth_context is 0, a new number will be generated with
 * krb5_generate_seq_number().
 *
 * Use krb5_free_data_contents() to free @a outbuf when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_rep(krb5_context context, krb5_auth_context auth_context, krb5_data *outbuf);

/**
 * Format and encrypt a @c KRB_AP_REP message for DCE RPC.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] outbuf          @c AP-REP message
 *
 * Use krb5_free_data_contents() to free @a outbuf when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_rep_dce(krb5_context context, krb5_auth_context auth_context, krb5_data *outbuf);

/**
 * Parse and decrypt a @c KRB_AP_REP message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  inbuf           AP-REP message
 * @param [out] repl            Decrypted reply message
 *
 * This function parses, decrypts and verifies a message from @a inbuf and
 * fills in @a repl with a pointer to allocated memory containing the fields
 * from the encrypted response.
 *
 * Use krb5_free_ap_rep_enc_part() to free @a repl when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_rep(krb5_context context, krb5_auth_context auth_context,
            const krb5_data *inbuf, krb5_ap_rep_enc_part **repl);

/**
 * Parse and decrypt a @c KRB_AP_REP message for DCE RPC.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  inbuf           AP-REP message
 * @param [out] nonce           Sequence number from the decrypted reply
 *
 * This function parses, decrypts and verifies a message from @a inbuf and
 * fills in @a nonce with a decrypted reply sequence number.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_rep_dce(krb5_context context, krb5_auth_context auth_context,
                const krb5_data *inbuf, krb5_ui_4 *nonce);

/**
 * Format and encode a @c KRB_ERROR message.
 *
 * @param [in]  context         Library context
 * @param [in]  dec_err         Error structure to be encoded
 * @param [out] enc_err         Encoded error structure
 *
 * This function creates a @c KRB_ERROR message in @a enc_err.  Use
 * krb5_free_data_contents() to free @a enc_err when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_error(krb5_context context, const krb5_error *dec_err,
              krb5_data *enc_err);

/**
 * Decode a @c KRB-ERROR message.
 *
 * @param [in]  context         Library context
 * @param [in]  enc_errbuf      Encoded error message
 * @param [out] dec_error       Decoded error message
 *
 * This function processes @c KRB-ERROR message @a enc_errbuf and returns
 * an allocated structure @a dec_error containing the error message.
 * Use krb5_free_error() to free @a dec_error when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_error(krb5_context context, const krb5_data *enc_errbuf,
              krb5_error **dec_error);

/**
 * Process @c KRB-SAFE message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  inbuf           @c KRB-SAFE message to be parsed
 * @param [out] outbuf          Data parsed from @c KRB-SAFE message
 * @param [out] outdata         Replay data. Specify NULL if not needed
 *
 * This function parses a @c KRB-SAFE message, verifies its integrity, and
 * stores its data into @a outbuf.
 *
 * @note The @a outdata argument is required if #KRB5_AUTH_CONTEXT_RET_TIME or
 *       #KRB5_AUTH_CONTEXT_RET_SEQUENCE flag is set in the @a auth_context.
 *
 * @note @a auth_context must have a remote address set.  This address will be
 *       used to verify the sender address in the KRB-SAFE message.  If @a
 *       auth_context has a local address set, it will be used to verify the
 *       receiver address in the KRB-SAFE message if the message contains one.
 *       Both addresses must use type @c ADDRTYPE_ADDRPORT.
 *
 * If the #KRB5_AUTH_CONTEXT_DO_SEQUENCE flag is set in @a auth_context, the
 * sequence number of the KRB-SAFE message is checked against the remote
 * sequence number field of @a auth_context.  Otherwise, the sequence number is
 * not used.
 *
 * If the #KRB5_AUTH_CONTEXT_DO_TIME flag is set in @a auth_context,
 * then two additional checks are performed:
 * @li The timestamp in the message must be within the permitted clock skew
 *     (which is usually five minutes).
 * @li The message must not be a replayed message field in @a auth_context.
 *
 * Use krb5_free_data_contents() to free @a outbuf when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_safe(krb5_context context, krb5_auth_context auth_context,
             const krb5_data *inbuf, krb5_data *outbuf,
             krb5_replay_data *outdata);

/**
 * Process a @c KRB-PRIV message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication structure
 * @param [in]  inbuf           @c KRB-PRIV message to be parsed
 * @param [out] outbuf          Data parsed from @c KRB-PRIV message
 * @param [out] outdata         Replay data. Specify NULL if not needed
 *
 * This function parses a @c KRB-PRIV message, verifies its integrity, and
 * stores its unencrypted data into @a outbuf.
 *
 * @note If the #KRB5_AUTH_CONTEXT_RET_TIME or
 *       #KRB5_AUTH_CONTEXT_RET_SEQUENCE flag is set in @a auth_context, @a
 *       outdata is required.
 *
 * @note @a auth_context must have a remote address set.  This address will be
 *       used to verify the sender address in the KRB-PRIV message.  If @a
 *       auth_context has a local address set, it will be used to verify the
 *       receiver address in the KRB-PRIV message if the message contains one.
 *       Both addresses must use type @c ADDRTYPE_ADDRPORT.
 *
 * If the #KRB5_AUTH_CONTEXT_DO_SEQUENCE flag is set in @a auth_context, the
 * sequence number of the KRB-SAFE message is checked against the remote
 * sequence number field of @a auth_context.  Otherwise, the sequence number is
 * not used.
 *
 * If the #KRB5_AUTH_CONTEXT_DO_TIME flag is set in @a auth_context,
 * then two additional checks are performed:
 * @li The timestamp in the message must be within the permitted clock skew
 *     (which is usually five minutes).
 * @li The message must not be a replayed message field in @a auth_context.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_priv(krb5_context context, krb5_auth_context auth_context,
             const krb5_data *inbuf, krb5_data *outbuf,
             krb5_replay_data *outdata);

/**
 * Convert a string principal name to a krb5_principal structure.
 *
 * @param [in]  context         Library context
 * @param [in]  name            String representation of a principal name
 * @param [out] principal_out   New principal
 *
 * Convert a string representation of a principal name to a krb5_principal
 * structure.
 *
 * A string representation of a Kerberos name consists of one or more principal
 * name components, separated by slashes, optionally followed by the \@
 * character and a realm name.  If the realm name is not specified, the local
 * realm is used.
 *
 * To use the slash and \@ symbols as part of a component (quoted) instead of
 * using them as a component separator or as a realm prefix), put a backslash
 * (\) character in front of the symbol.  Similarly, newline, tab, backspace,
 * and NULL characters can be included in a component by using @c n, @c t, @c b
 * or @c 0, respectively.
 *
 * @note The realm in a Kerberos @a name cannot contain slash, colon,
 * or NULL characters.
 *
 * Use krb5_free_principal() to free @a principal_out when it is no longer
 * needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_parse_name(krb5_context context, const char *name,
                krb5_principal *principal_out);

#define KRB5_PRINCIPAL_PARSE_NO_REALM      0x1 /**< Error if realm is present */
#define KRB5_PRINCIPAL_PARSE_REQUIRE_REALM 0x2 /**< Error if realm is not present */
#define KRB5_PRINCIPAL_PARSE_ENTERPRISE    0x4 /**< Create single-component
                                                  enterprise principle */
#define KRB5_PRINCIPAL_PARSE_IGNORE_REALM  0x8 /**< Ignore realm if present */

/**
 * Convert a string principal name to a krb5_principal with flags.
 *
 * @param [in]  context         Library context
 * @param [in]  name            String representation of a principal name
 * @param [in]  flags           Flag
 * @param [out] principal_out   New principal
 *
 * Similar to krb5_parse_name(), this function converts a single-string
 * representation of a principal name to a krb5_principal structure.
 *
 * The following flags are valid:
 * @li #KRB5_PRINCIPAL_PARSE_NO_REALM - no realm must be present in @a name
 * @li #KRB5_PRINCIPAL_PARSE_REQUIRE_REALM - realm must be present in @a name
 * @li #KRB5_PRINCIPAL_PARSE_ENTERPRISE - create single-component enterprise
 *                                        principal
 * @li #KRB5_PRINCIPAL_PARSE_IGNORE_REALM - ignore realm if present in @a name
 *
 * If @c KRB5_PRINCIPAL_PARSE_NO_REALM or @c KRB5_PRINCIPAL_PARSE_IGNORE_REALM
 * is specified in @a flags, the realm of the new principal will be empty.
 * Otherwise, the default realm for @a context will be used if @a name does not
 * specify a realm.
 *
 * Use krb5_free_principal() to free @a principal_out when it is no longer
 * needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_parse_name_flags(krb5_context context, const char *name,
                      int flags, krb5_principal *principal_out);

/**
 * Convert a krb5_principal structure to a string representation.
 *
 * @param [in]  context         Library context
 * @param [in]  principal       Principal
 * @param [out] name            String representation of principal name
 *
 * The resulting string representation uses the format and quoting conventions
 * described for krb5_parse_name().
 *
 * Use krb5_free_unparsed_name() to free @a name when it is no longer needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_unparse_name(krb5_context context, krb5_const_principal principal,
                  char **name);

/**
 * Convert krb5_principal structure to string and length.
 *
 * @param [in]     context      Library context
 * @param [in]     principal    Principal
 * @param [in,out] name         String representation of principal name
 * @param [in,out] size         Size of unparsed name
 *
 * This function is similar to krb5_unparse_name(), but allows the use of an
 * existing buffer for the result.  If size is not NULL, then @a name must
 * point to either NULL or an existing buffer of at least the size pointed to
 * by @a size.  The buffer will be allocated or resized if necessary, with the
 * new pointer stored into @a name.  Whether or not the buffer is resized, the
 * necessary space for the result, including null terminator, will be stored
 * into @a size.
 *
 * If size is NULL, this function behaves exactly as krb5_unparse_name().
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes. On failure @a name is set to NULL
 */
krb5_error_code KRB5_CALLCONV
krb5_unparse_name_ext(krb5_context context, krb5_const_principal principal,
                      char **name, unsigned int *size);

#define KRB5_PRINCIPAL_UNPARSE_SHORT  0x1 /**< Omit realm if it is the local realm */
#define KRB5_PRINCIPAL_UNPARSE_NO_REALM 0x2 /**< Omit realm always */
#define KRB5_PRINCIPAL_UNPARSE_DISPLAY  0x4 /**< Don't escape special characters */

/**
 * Convert krb5_principal structure to a string with flags.
 *
 * @param [in]  context         Library context
 * @param [in]  principal       Principal
 * @param [in]  flags           Flags
 * @param [out] name            String representation of principal name
 *
 * Similar to krb5_unparse_name(), this function converts a krb5_principal
 * structure to a string representation.
 *
 * The following flags are valid:
 * @li #KRB5_PRINCIPAL_UNPARSE_SHORT - omit realm if it is the local realm
 * @li #KRB5_PRINCIPAL_UNPARSE_NO_REALM - omit realm
 * @li #KRB5_PRINCIPAL_UNPARSE_DISPLAY - do not quote special characters
 *
 * Use krb5_free_unparsed_name() to free @a name when it is no longer needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes. On failure @a name is set to NULL
 */
krb5_error_code KRB5_CALLCONV
krb5_unparse_name_flags(krb5_context context, krb5_const_principal principal,
                        int flags, char **name);

/**
 * Convert krb5_principal structure to string format with flags.
 *
 * @param [in]  context         Library context
 * @param [in]  principal       Principal
 * @param [in]  flags           Flags
 * @param [out] name            Single string format of principal name
 * @param [out] size            Size of unparsed name buffer
 *
 * @sa krb5_unparse_name() krb5_unparse_name_flags() krb5_unparse_name_ext()
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes. On failure @a name is set to NULL
 */
krb5_error_code KRB5_CALLCONV
krb5_unparse_name_flags_ext(krb5_context context, krb5_const_principal principal,
                            int flags, char **name, unsigned int *size);

/**
 * Set the realm field of a principal
 *
 * @param [in] context          Library context
 * @param [in] principal        Principal name
 * @param [in] realm            Realm name
 *
 * Set the realm name part of @a principal to @a realm, overwriting the
 * previous realm.
 *
 * @retval
 * 0   Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_set_principal_realm(krb5_context context, krb5_principal principal,
                         const char *realm);

/**
 * Search a list of addresses for a specified address.
 *
 * @param [in] context          Library context
 * @param [in] addr             Address to search for
 * @param [in] addrlist         Address list to be searched (or NULL)
 *
 * @note If @a addrlist contains only a NetBIOS addresses, it will be treated
 *       as a null list.
 *
 * @return
 * TRUE if @a addr is listed in @a addrlist, or @c addrlist is NULL; FALSE
 * otherwise
 */
krb5_boolean KRB5_CALLCONV_WRONG
krb5_address_search(krb5_context context, const krb5_address *addr,
                    krb5_address *const *addrlist);

/**
 * Compare two Kerberos addresses.
 *
 * @param [in] context          Library context
 * @param [in] addr1            First address to be compared
 * @param [in] addr2            Second address to be compared
 *
 * @return
 * TRUE if the addresses are the same, FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_address_compare(krb5_context context, const krb5_address *addr1,
                     const krb5_address *addr2);

/**
 * Return an ordering of the specified addresses.
 *
 * @param [in] context          Library context
 * @param [in] addr1            First address
 * @param [in] addr2            Second address
 *
 * @retval
 *  0 The two addresses are the same
 * @retval
 *  \< 0 First address is less than second
 * @retval
 *  \> 0 First address is greater than second
 */
int KRB5_CALLCONV
krb5_address_order(krb5_context context, const krb5_address *addr1,
                   const krb5_address *addr2);

/**
 * Compare the realms of two principals.
 *
 * @param [in] context          Library context
 * @param [in] princ1           First principal
 * @param [in] princ2           Second principal
 *
 * @retval
 * TRUE if the realm names are the same; FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_realm_compare(krb5_context context, krb5_const_principal princ1,
                   krb5_const_principal princ2);

/**
 * Compare two principals.
 *
 * @param [in] context          Library context
 * @param [in] princ1           First principal
 * @param [in] princ2           Second principal
 *
 * @retval
 * TRUE if the principals are the same; FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_principal_compare(krb5_context context,
                       krb5_const_principal princ1,
                       krb5_const_principal princ2);

/**
 * Compare two principals ignoring realm components.
 *
 * @param [in] context          Library context
 * @param [in] princ1           First principal
 * @param [in] princ2           Second principal
 *
 * Similar to krb5_principal_compare(), but do not compare the realm
 * components of the principals.
 *
 * @retval
 * TRUE if the principals are the same; FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_principal_compare_any_realm(krb5_context context,
                                 krb5_const_principal princ1,
                                 krb5_const_principal princ2);

#define KRB5_PRINCIPAL_COMPARE_IGNORE_REALM  1 /**< ignore realm component */
#define KRB5_PRINCIPAL_COMPARE_ENTERPRISE    2 /**< UPNs as real principals */
#define KRB5_PRINCIPAL_COMPARE_CASEFOLD      4 /**< case-insensitive */
#define KRB5_PRINCIPAL_COMPARE_UTF8          8 /**< treat principals as UTF-8 */

/**
 * Compare two principals with additional flags.
 *
 * @param [in] context           Library context
 * @param [in] princ1            First principal
 * @param [in] princ2            Second principal
 * @param [in] flags             Flags
 *
 * Valid flags are:
 * @li #KRB5_PRINCIPAL_COMPARE_IGNORE_REALM - ignore realm component
 * @li #KRB5_PRINCIPAL_COMPARE_ENTERPRISE - UPNs as real principals
 * @li #KRB5_PRINCIPAL_COMPARE_CASEFOLD case-insensitive
 * @li #KRB5_PRINCIPAL_COMPARE_UTF8 - treat principals as UTF-8
 *
 * @sa krb5_principal_compare()
 *
 * @retval
 * TRUE if the principal names are the same; FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_principal_compare_flags(krb5_context context,
                             krb5_const_principal princ1,
                             krb5_const_principal princ2,
                             int flags);

/**
 * Initialize an empty @c krb5_keyblock.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [in]  length          Length of keyblock (or 0)
 * @param [out] out             New keyblock structure
 *
 * Initialize a new keyblock and allocate storage for the contents of the key.
 * It is legal to pass in a length of 0, in which case contents are left
 * unallocated.  Use krb5_free_keyblock() to free @a out when it is no longer
 * needed.
 *
 * @note If @a length is set to 0, contents are left unallocated.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_keyblock(krb5_context context, krb5_enctype enctype,
                   size_t length, krb5_keyblock **out);

/**
 * Copy a keyblock.
 *
 * @param [in]  context         Library context
 * @param [in]  from            Keyblock to be copied
 * @param [out] to              Copy of keyblock @a from
 *
 * This function creates a new keyblock with the same contents as @a from.  Use
 * krb5_free_keyblock() to free @a to when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_keyblock(krb5_context context, const krb5_keyblock *from,
                   krb5_keyblock **to);

/**
 * Copy the contents of a keyblock.
 *
 * @param [in]  context         Library context
 * @param [in]  from            Key to be copied
 * @param [out] to              Output key
 *
 * This function copies the contents of @a from to @a to.  Use
 * krb5_free_keyblock_contents() to free @a to when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_keyblock_contents(krb5_context context, const krb5_keyblock *from,
                            krb5_keyblock *to);

/**
 * Copy a krb5_creds structure.
 *
 * @param [in]  context         Library context
 * @param [in]  incred          Credentials structure to be copied
 * @param [out] outcred         Copy of @a incred
 *
 * This function creates a new credential with the contents of @a incred.  Use
 * krb5_free_creds() to free @a outcred when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_creds(krb5_context context, const krb5_creds *incred, krb5_creds **outcred);

/**
 * Copy a krb5_data object.
 *
 * @param [in]  context           Library context
 * @param [in]  indata            Data object to be copied
 * @param [out] outdata           Copy of @a indata
 *
 * This function creates a new krb5_data object with the contents of @a indata.
 * Use krb5_free_data() to free @a outdata when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_data(krb5_context context, const krb5_data *indata, krb5_data **outdata);

/**
 * Copy a principal.
 *
 * @param [in]  context         Library context
 * @param [in]  inprinc         Principal to be copied
 * @param [out] outprinc        Copy of @a inprinc
 *
 * This function creates a new principal structure with the contents of @a
 * inprinc.  Use krb5_free_principal() to free @a outprinc when it is no longer
 * needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_principal(krb5_context context, krb5_const_principal inprinc,
                    krb5_principal *outprinc);

/**
 * Copy an array of addresses.
 *
 * @param [in]  context         Library context
 * @param [in]  inaddr          Array of addresses to be copied
 * @param [out] outaddr         Copy of array of addresses
 *
 * This function creates a new address array containing a copy of @a inaddr.
 * Use krb5_free_addresses() to free @a outaddr when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_addresses(krb5_context context, krb5_address *const *inaddr,
                    krb5_address ***outaddr);

/**
 * Copy a krb5_ticket structure.
 *
 * @param [in]  context         Library context
 * @param [in]  from            Ticket to be copied
 * @param [out] pto             Copy of ticket
 *
 * This function creates a new krb5_ticket structure containing the contents of
 * @a from.  Use krb5_free_ticket() to free @a pto when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_ticket(krb5_context context, const krb5_ticket *from, krb5_ticket **pto);

/**
 * Copy an authorization data list.
 *
 * @param [in]  context         Library context
 * @param [in]  in_authdat      List of @a krb5_authdata structures
 * @param [out] out             New array of @a krb5_authdata structures
 *
 * This function creates a new authorization data list containing a copy of @a
 * in_authdat, which must be null-terminated.  Use krb5_free_authdata() to free
 * @a out when it is no longer needed.
 *
 * @note The last array entry in @a in_authdat must be a NULL pointer.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_authdata(krb5_context context,
                   krb5_authdata *const *in_authdat, krb5_authdata ***out);

/**
 * Find authorization data elements.
 *
 * @param [in]  context         Library context
 * @param [in]  ticket_authdata Authorization data list from ticket
 * @param [in]  ap_req_authdata Authorization data list from AP request
 * @param [in]  ad_type         Authorization data type to find
 * @param [out] results         List of matching entries
 *
 * This function searches @a ticket_authdata and @a ap_req_authdata for
 * elements of type @a ad_type.  Either input list may be NULL, in which case
 * it will not be searched; otherwise, the input lists must be terminated by
 * NULL entries.  This function will search inside AD-IF-RELEVANT containers if
 * found in either list.  Use krb5_free_authdata() to free @a results when it
 * is no longer needed.
 *
 * @version New in 1.10
 */
krb5_error_code KRB5_CALLCONV
krb5_find_authdata(krb5_context context, krb5_authdata *const *ticket_authdata,
                   krb5_authdata *const *ap_req_authdata,
                   krb5_authdatatype ad_type, krb5_authdata ***results);

/**
 * Merge two authorization data lists into a new list.
 *
 * @param [in]  context         Library context
 * @param [in]  inauthdat1      First list of @a krb5_authdata structures
 * @param [in]  inauthdat2      Second list of @a krb5_authdata structures
 * @param [out] outauthdat      Merged list of @a krb5_authdata structures
 *
 * Merge two authdata arrays, such as the array from a ticket
 * and authenticator.
 * Use krb5_free_authdata() to free @a outauthdat when it is no longer needed.
 *
 * @note The last array entry in @a inauthdat1 and @a inauthdat2
 * must be a NULL pointer.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_merge_authdata(krb5_context context,
                    krb5_authdata *const *inauthdat1,
                    krb5_authdata * const *inauthdat2,
                    krb5_authdata ***outauthdat);

/**
 * Copy a krb5_authenticator structure.
 *
 * @param [in]  context         Library context
 * @param [in]  authfrom        krb5_authenticator structure to be copied
 * @param [out] authto          Copy of krb5_authenticator structure
 *
 * This function creates a new krb5_authenticator structure with the content of
 * @a authfrom.  Use krb5_free_authenticator() to free @a authto when it is no
 * longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_authenticator(krb5_context context, const krb5_authenticator *authfrom,
                        krb5_authenticator **authto);

/**
 * Copy a krb5_checksum structure.
 *
 * @param [in]  context         Library context
 * @param [in]  ckfrom          Checksum to be copied
 * @param [out] ckto            Copy of krb5_checksum structure
 *
 * This function creates a new krb5_checksum structure with the contents of @a
 * ckfrom.  Use krb5_free_checksum() to free @a ckto when it is no longer
 * needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_checksum(krb5_context context, const krb5_checksum *ckfrom,
                   krb5_checksum **ckto);

/**
 * Generate a replay cache object for server use and open it.
 *
 * @param [in]  context         Library context
 * @param [in]  piece           Unique identifier for replay cache
 * @param [out] rcptr           Handle to an open rcache
 *
 * This function generates a replay cache name based on @a piece and opens a
 * handle to it.  Typically @a piece is the first component of the service
 * principal name.  Use krb5_rc_close() to close @a rcptr when it is no longer
 * needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_server_rcache(krb5_context context, const krb5_data *piece,
                       krb5_rcache *rcptr);

/**
 * Build a principal name using length-counted strings.
 *
 * @param [in]  context  Library context
 * @param [out] princ    Principal name
 * @param [in]  rlen     Realm name length
 * @param [in]  realm    Realm name
 * @param [in]  ...      List of unsigned int/char * components, followed by 0
 *
 * This function creates a principal from a length-counted string and a
 * variable-length list of length-counted components.  The list of components
 * ends with the first 0 length argument (so it is not possible to specify an
 * empty component with this function).  Call krb5_free_principal() to free
 * allocated memory for principal when it is no longer needed.
 *
 * @code
 * Example of how to build principal WELLKNOWN/ANONYMOUS@R
 *     krb5_build_principal_ext(context, &principal, strlen("R"), "R",
 *         (unsigned int)strlen(KRB5_WELLKNOWN_NAMESTR),
 *         KRB5_WELLKNOWN_NAMESTR,
 *         (unsigned int)strlen(KRB5_ANONYMOUS_PRINCSTR),
 *         KRB5_ANONYMOUS_PRINCSTR, 0);
 * @endcode
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV_C
krb5_build_principal_ext(krb5_context context,  krb5_principal * princ,
                         unsigned int rlen, const char * realm, ...);

/**
 * Build a principal name using null-terminated strings.
 *
 * @param [in]  context         Library context
 * @param [out] princ           Principal name
 * @param [in]  rlen            Realm name length
 * @param [in]  realm           Realm name
 * @param [in]  ...             List of char * components, ending with NULL
 *
 * Call krb5_free_principal() to free @a princ when it is no longer needed.
 *
 * @note krb5_build_principal() and krb5_build_principal_alloc_va() perform the
 * same task.  krb5_build_principal() takes variadic arguments.
 * krb5_build_principal_alloc_va() takes a pre-computed @a varargs pointer.
 *
 * @code
 * Example of how to build principal H/S@R
 *     krb5_build_principal(context, &principal,
 *                          strlen("R"), "R", "H", "S", (char*)NULL);
 * @endcode
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV_C
krb5_build_principal(krb5_context context,
                     krb5_principal * princ,
                     unsigned int rlen,
                     const char * realm, ...)
#if __GNUC__ >= 4
    __attribute__ ((sentinel))
#endif
    ;
#if KRB5_DEPRECATED
/** @deprecated Replaced by krb5_build_principal_alloc_va(). */
KRB5_ATTR_DEPRECATED krb5_error_code KRB5_CALLCONV
krb5_build_principal_va(krb5_context context,
                        krb5_principal princ,
                        unsigned int rlen,
                        const char *realm,
                        va_list ap);
#endif

/**
 * Build a principal name, using a precomputed variable argument list
 *
 * @param [in]  context         Library context
 * @param [out] princ           Principal structure
 * @param [in]  rlen            Realm name length
 * @param [in]  realm           Realm name
 * @param [in]  ap              List of char * components, ending with NULL
 *
 * Similar to krb5_build_principal(), this function builds a principal name,
 * but its name components are specified as a va_list.
 *
 * Use krb5_free_principal() to deallocate @a princ when it is no longer
 * needed.
 *
 * @code
 * Function usage example:
 *   va_list ap;
 *   va_start(ap, realm);
 *   krb5_build_principal_alloc_va(context, princ, rlen, realm, ap);
 *   va_end(ap);
 * @endcode
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_build_principal_alloc_va(krb5_context context,
                              krb5_principal *princ,
                              unsigned int rlen,
                              const char *realm,
                              va_list ap);

/**
 * Convert a Kerberos V4 principal to a Kerberos V5 principal.
 *
 * @param [in]  context         Library context
 * @param [in]  name            V4 name
 * @param [in]  instance        V4 instance
 * @param [in]  realm           Realm
 * @param [out] princ           V5 principal
 *
 * This function builds a @a princ from V4 specification based on given input
 * @a name.instance\@realm.
 *
 * Use krb5_free_principal() to free @a princ when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_425_conv_principal(krb5_context context, const char *name,
                        const char *instance, const char *realm,
                        krb5_principal *princ);

/**
 * Convert a Kerberos V5 principal to a Kerberos V4 principal.
 *
 * @param [in]  context         Library context
 * @param [in]  princ           V5 Principal
 * @param [out] name            V4 principal's name to be filled in
 * @param [out] inst            V4 principal's instance name to be filled in
 * @param [out] realm           Principal's realm name to be filled in
 *
 * This function separates a V5 principal @a princ into @a name, @a instance,
 * and @a realm.
 *
 * @retval
 *  0  Success
 * @retval
 *  KRB5_INVALID_PRINCIPAL   Invalid principal name
 * @retval
 *  KRB5_CONFIG_CANTOPEN     Can't open or find Kerberos configuration file
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_524_conv_principal(krb5_context context, krb5_const_principal princ,
                        char *name, char *inst, char *realm);
/**
 *@deprecated
 */
struct credentials;

/**
 * Convert a Kerberos V5 credentials to a Kerberos V4 credentials
 *
 * @note Not implemented
 *
 * @retval KRB524_KRB4_DISABLED (always)
 */
int KRB5_CALLCONV
krb5_524_convert_creds(krb5_context context, krb5_creds *v5creds,
                       struct credentials *v4creds);

#if KRB5_DEPRECATED
#define krb524_convert_creds_kdc krb5_524_convert_creds
#define krb524_init_ets(x) (0)
#endif

/* libkt.spec */

/**
 * Get a handle for a key table.
 *
 * @param [in]  context         Library context
 * @param [in]  name            Name of the key table
 * @param [out] ktid            Key table handle
 *
 * Resolve the key table name @a name and set @a ktid to a handle identifying
 * the key table.  Use krb5_kt_close() to free @a ktid when it is no longer
 * needed.
 *
 * @a name must be of the form @c type:residual, where @a type must be a type
 * known to the library and @a residual portion should be specific to the
 * particular keytab type.  If no @a type is given, the default is @c FILE.
 *
 * If @a name is of type @c FILE, the keytab file is not opened by this call.
 *
 * @code
 *  Example: krb5_kt_resolve(context, "FILE:/tmp/filename", &ktid);
 * @endcode
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_resolve(krb5_context context, const char *name, krb5_keytab *ktid);

/**
 * Duplicate keytab handle.
 *
 * @param [in]  context         Library context
 * @param [in]  in              Key table handle to be duplicated
 * @param [out] out             Key table handle
 *
 * Create a new handle referring to the same key table as @a in.  The new
 * handle and @a in can be closed independently.
 *
 * @version New in 1.12
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_dup(krb5_context context, krb5_keytab in, krb5_keytab *out);

/**
 * Get the default key table name.
 *
 * @param [in]     context      Library context
 * @param [out]    name         Default key table name
 * @param [in]     name_size    Space available in @a name
 *
 * Fill @a name with the name of the default key table for @a context.
 *
 * @sa MAX_KEYTAB_NAME_LEN
 *
 * @retval
 * 0 Success
 * @retval
 * KRB5_CONFIG_NOTENUFSPACE Buffer is too short
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_default_name(krb5_context context, char *name, int name_size);

/**
 * Resolve the default key table.
 *
 * @param [in]  context         Library context
 * @param [out] id              Key table handle
 *
 * Set @a id to a handle to the default key table.  The key table is not
 * opened.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_default(krb5_context context, krb5_keytab *id);

/**
 * Resolve the default client key table.
 *
 * @param [in]     context      Library context
 * @param [out]    keytab_out   Key table handle
 *
 * Fill @a keytab_out with a handle to the default client key table.
 *
 * @version New in 1.11
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_client_default(krb5_context context, krb5_keytab *keytab_out);

/**
 * Free the contents of a key table entry.
 *
 * @param [in] context          Library context
 * @param [in] entry            Key table entry whose contents are to be freed
 *
 * @note The pointer is not freed.
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_free_keytab_entry_contents(krb5_context context, krb5_keytab_entry *entry);

/** @deprecated Use krb5_free_keytab_entry_contents instead. */
krb5_error_code KRB5_CALLCONV
krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *entry);


/* remove and add are functions, so that they can return NOWRITE
   if not a writable keytab */

/**
 * Remove an entry from a key table.
 *
 * @param [in] context          Library context
 * @param [in] id               Key table handle
 * @param [in] entry            Entry to remove from key table
 *
 * @retval
 * 0 Success
 * @retval
 *  KRB5_KT_NOWRITE     Key table is not writable
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_remove_entry(krb5_context context, krb5_keytab id, krb5_keytab_entry *entry);

/**
 * Add a new entry to a key table.
 *
 * @param [in] context          Library context
 * @param [in] id               Key table handle
 * @param [in] entry            Entry to be added
 *
 * @retval
 * 0  Success
 * @retval
 *  ENOMEM    Insufficient memory
 * @retval
 *  KRB5_KT_NOWRITE  Key table is not writeable
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_add_entry(krb5_context context, krb5_keytab id, krb5_keytab_entry *entry);

/**
 * Convert a principal name into the default salt for that principal.
 *
 * @param [in]  context         Library context
 * @param [in]  pr              Principal name
 * @param [out] ret             Default salt for @a pr to be filled in
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV_WRONG
krb5_principal2salt(krb5_context context,
                    krb5_const_principal pr, krb5_data *ret);
/* librc.spec--see rcache.h */

/* libcc.spec */

/**
 * Resolve a credential cache name.
 *
 * @param [in]  context         Library context
 * @param [in]  name            Credential cache name to be resolved
 * @param [out] cache           Credential cache handle
 *
 * Fills in @a cache with a @a cache handle that corresponds to the name in @a
 * name.  @a name should be of the form @c type:residual, and @a type must be a
 * type known to the library.  If the @a name does not contain a colon,
 * interpret it as a file name.
 *
 * @code
 * Example: krb5_cc_resolve(context, "MEMORY:C_", &cache);
 * @endcode
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_resolve(krb5_context context, const char *name, krb5_ccache *cache);

/**
 * Duplicate ccache handle.
 *
 * @param [in]  context         Library context
 * @param [in]  in              Credential cache handle to be duplicated
 * @param [out] out             Credential cache handle
 *
 * Create a new handle referring to the same cache as @a in.
 * The new handle and @a in can be closed independently.
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_dup(krb5_context context, krb5_ccache in, krb5_ccache *out);

/**
 * Return the name of the default credential cache.
 *
 * @param [in] context          Library context
 *
 * Return a pointer to the default credential cache name for @a context, as
 * determined by a prior call to krb5_cc_set_default_name(), by the KRB5CCNAME
 * environment variable, by the default_ccache_name profile variable, or by the
 * operating system or build-time default value.  The returned value must not
 * be modified or freed by the caller.  The returned value becomes invalid when
 * @a context is destroyed krb5_free_context() or if a subsequent call to
 * krb5_cc_set_default_name() is made on @a context.
 *
 * The default credential cache name is cached in @a context between calls to
 * this function, so if the value of KRB5CCNAME changes in the process
 * environment after the first call to this function on, that change will not
 * be reflected in later calls with the same context.  The caller can invoke
 * krb5_cc_set_default_name() with a NULL value of @a name to clear the cached
 * value and force the default name to be recomputed.
 *
 * @return
 * Name of default credential cache for the current user.
 */
const char *KRB5_CALLCONV
krb5_cc_default_name(krb5_context context);

/**
 * Set the default credential cache name.
 *
 * @param [in] context          Library context
 * @param [in] name             Default credential cache name or NULL
 *
 * Set the default credential cache name to @a name for future operations using
 * @a context.  If @a name is NULL, clear any previous application-set default
 * name and forget any cached value of the default name for @a context.
 *
 * Calls to this function invalidate the result of any previous calls to
 * krb5_cc_default_name() using @a context.
 *
 * @retval
 *  0  Success
 * @retval
 *  KV5M_CONTEXT          Bad magic number for @c _krb5_context structure
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_set_default_name(krb5_context context, const char *name);

/**
 * Resolve the default credential cache name.
 *
 * @param [in]  context         Library context
 * @param [out] ccache          Pointer to credential cache name
 *
 * Create a handle to the default credential cache as given by
 * krb5_cc_default_name().
 *
 * @retval
 * 0  Success
 * @retval
 * KV5M_CONTEXT            Bad magic number for @c _krb5_context structure
 * @retval
 * KRB5_FCC_INTERNAL       The name of the default credential cache cannot be
 *                         obtained
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_default(krb5_context context, krb5_ccache *ccache);

/**
 * Copy a credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  incc            Credential cache to be copied
 * @param [out] outcc           Copy of credential cache to be filled in
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_copy_creds(krb5_context context, krb5_ccache incc, krb5_ccache outcc);

/**
 * Get a configuration value from a credential cache.
 *
 * @param [in]     context      Library context
 * @param [in]     id           Credential cache handle
 * @param [in]     principal    Configuration for this principal;
 *                              if NULL, global for the whole cache
 * @param [in]     key          Name of config variable
 * @param [out]    data         Data to be fetched
 *
 * Use krb5_free_data_contents() to free @a data when it is no longer needed.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_get_config(krb5_context context, krb5_ccache id,
                   krb5_const_principal principal,
                   const char *key, krb5_data *data);

/**
 * Store a configuration value in a credential cache.
 *
 * @param [in]     context      Library context
 * @param [in]     id           Credential cache handle
 * @param [in]     principal    Configuration for a specific principal;
 *                              if NULL, global for the whole cache
 * @param [in]     key          Name of config variable
 * @param [in]     data         Data to store, or NULL to remove
 *
 * @note Existing configuration under the same key is over-written.
 *
 * @warning Before version 1.10 @a data was assumed to be always non-null.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_set_config(krb5_context context, krb5_ccache id,
                   krb5_const_principal principal,
                   const char *key, krb5_data *data);

/**
 * Test whether a principal is a configuration principal.
 *
 * @param [in] context          Library context
 * @param [in] principal        Principal to check
 *
 * @return
 * @c TRUE if the principal is a configuration principal (generated part of
 * krb5_cc_set_config()); @c FALSE otherwise.
 */
krb5_boolean KRB5_CALLCONV
krb5_is_config_principal(krb5_context context, krb5_const_principal principal);

/**
 * Make a credential cache the primary cache for its collection.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 *
 * If the type of @a cache supports it, set @a cache to be the primary
 * credential cache for the collection it belongs to.
 *
 * @retval
 * 0  Success, or the type of @a cache doesn't support switching
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_switch(krb5_context context, krb5_ccache cache);

/**
 * Determine whether a credential cache type supports switching.
 *
 * @param [in] context          Library context
 * @param [in] type             Credential cache type
 *
 * @version New in 1.10
 *
 * @retval TRUE if @a type supports switching
 * @retval FALSE if it does not or is not a valid credential cache type.
 */
krb5_boolean KRB5_CALLCONV
krb5_cc_support_switch(krb5_context context, const char *type);

/**
 * Find a credential cache with a specified client principal.
 *
 * @param [in]  context         Library context
 * @param [in]  client          Client principal
 * @param [out] cache_out       Credential cache handle
 *
 * Find a cache within the collection whose default principal is @a client.
 * Use @a krb5_cc_close to close @a ccache when it is no longer needed.
 *
 * @retval 0 Success
 * @retval KRB5_CC_NOTFOUND
 *
 * @sa krb5_cccol_cursor_new
 *
 * @version New in 1.10
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_cache_match(krb5_context context, krb5_principal client,
                    krb5_ccache *cache_out);

/**
 * Select a credential cache to use with a server principal.
 *
 * @param [in]  context         Library context
 * @param [in]  server          Server principal
 * @param [out] cache_out       Credential cache handle
 * @param [out] princ_out       Client principal
 *
 * Select a cache within the collection containing credentials most appropriate
 * for use with @a server, according to configured rules and heuristics.
 *
 * Use krb5_cc_close() to release @a cache_out when it is no longer needed.
 * Use krb5_free_principal() to release @a princ_out when it is no longer
 * needed.  Note that @a princ_out is set in some error conditions.
 *
 * @return
 * If an appropriate cache is found, 0 is returned, @a cache_out is set to the
 * selected cache, and @a princ_out is set to the default principal of that
 * cache.
 *
 * If the appropriate client principal can be authoritatively determined but
 * the cache collection contains no credentials for that principal, then
 * KRB5_CC_NOTFOUND is returned, @a cache_out is set to NULL, and @a princ_out
 * is set to the appropriate client principal.
 *
 * If no configured mechanism can determine the appropriate cache or principal,
 * KRB5_CC_NOTFOUND is returned and @a cache_out and @a princ_out are set to
 * NULL.
 *
 * Any other error code indicates a fatal error in the processing of a cache
 * selection mechanism.
 *
 * @version New in 1.10
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_select(krb5_context context, krb5_principal server,
               krb5_ccache *cache_out, krb5_principal *princ_out);

/* krb5_free.c */
/**
 * Free the storage assigned to a principal.
 *
 * @param [in] context          Library context
 * @param [in] val              Principal to be freed
 */
void KRB5_CALLCONV
krb5_free_principal(krb5_context context, krb5_principal val);

/**
 * Free a krb5_authenticator structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Authenticator structure to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_authenticator(krb5_context context, krb5_authenticator *val);

/**
 * Free the data stored in array of addresses.
 *
 * @param [in] context          Library context
 * @param [in] val              Array of addresses to be freed
 *
 * This function frees the contents of @a val and the array itself.
 *
 * @note The last entry in the array must be a NULL pointer.
 */
void KRB5_CALLCONV
krb5_free_addresses(krb5_context context, krb5_address **val);

/**
 * Free the storage assigned to array of authentication data.
 *
 * @param [in] context          Library context
 * @param [in] val              Array of authentication data to be freed
 *
 * This function frees the contents of @a val and the array itself.
 *
 * @note The last entry in the array must be a NULL pointer.
 */
void KRB5_CALLCONV
krb5_free_authdata(krb5_context context, krb5_authdata **val);

/**
 * Free a ticket.
 *
 * @param [in] context          Library context
 * @param [in] val              Ticket to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_ticket(krb5_context context, krb5_ticket *val);

/**
 * Free an error allocated by krb5_read_error() or krb5_sendauth().
 *
 * @param [in] context          Library context
 * @param [in] val              Error data structure to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_error(krb5_context context, krb5_error *val);

/**
 * Free a krb5_creds structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Credential structure to be freed.
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_creds(krb5_context context, krb5_creds *val);

/**
 * Free the contents of a krb5_creds structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Credential structure to free contents of
 *
 * This function frees the contents of @a val, but not the structure itself.
 */
void KRB5_CALLCONV
krb5_free_cred_contents(krb5_context context, krb5_creds *val);

/**
 * Free a krb5_checksum structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Checksum structure to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_checksum(krb5_context context, krb5_checksum *val);

/**
 * Free the contents of a krb5_checksum structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Checksum structure to free contents of
 *
 * This function frees the contents of @a val, but not the structure itself.
 */
void KRB5_CALLCONV
krb5_free_checksum_contents(krb5_context context, krb5_checksum *val);

/**
 * Free a krb5_keyblock structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Keyblock to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_keyblock(krb5_context context, krb5_keyblock *val);

/**
 * Free the contents of a krb5_keyblock structure.
 *
 * @param [in] context          Library context
 * @param [in] key              Keyblock to be freed
 *
 * This function frees the contents of @a key, but not the structure itself.
 */
void KRB5_CALLCONV
krb5_free_keyblock_contents(krb5_context context, krb5_keyblock *key);

/**
 * Free a krb5_ap_rep_enc_part structure.
 *
 * @param [in] context          Library context
 * @param [in] val              AP-REP enc part to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_ap_rep_enc_part(krb5_context context, krb5_ap_rep_enc_part *val);

/**
 * Free a krb5_data structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Data structure to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_data(krb5_context context, krb5_data *val);

/* Free a krb5_octet_data structure (should be unused). */
void KRB5_CALLCONV
krb5_free_octet_data(krb5_context context, krb5_octet_data *val);

/**
 * Free the contents of a krb5_data structure and zero the data field.
 *
 * @param [in] context          Library context
 * @param [in] val              Data structure to free contents of
 *
 * This function frees the contents of @a val, but not the structure itself.
 */
void KRB5_CALLCONV
krb5_free_data_contents(krb5_context context, krb5_data *val);

/**
 * Free a string representation of a principal.
 *
 * @param [in] context          Library context
 * @param [in] val              Name string to be freed
 */
void KRB5_CALLCONV
krb5_free_unparsed_name(krb5_context context, char *val);

/**
 * Free a string allocated by a krb5 function.
 *
 * @param [in] context          Library context
 * @param [in] val              String to be freed
 *
 * @version New in 1.10
 */
void KRB5_CALLCONV
krb5_free_string(krb5_context context, char *val);

/**
 * Free an array of encryption types.
 *
 * @param [in] context          Library context
 * @param [in] val              Array of enctypes to be freed
 *
 * @version New in 1.12
 */
void KRB5_CALLCONV
krb5_free_enctypes(krb5_context context, krb5_enctype *val);

/**
 * Free an array of checksum types.
 *
 * @param [in] context          Library context
 * @param [in] val              Array of checksum types to be freed
 */
void KRB5_CALLCONV
krb5_free_cksumtypes(krb5_context context, krb5_cksumtype *val);

/* From krb5/os, but needed by the outside world */
/**
 * Retrieve the system time of day, in sec and ms, since the epoch.
 *
 * @param [in]  context         Library context
 * @param [out] seconds         System timeofday, seconds portion
 * @param [out] microseconds    System timeofday, microseconds portion
 *
 * This function retrieves the system time of day with the context
 * specific time offset adjustment.
 *
 * @sa krb5_crypto_us_timeofday()
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_us_timeofday(krb5_context context,
                  krb5_timestamp *seconds, krb5_int32 *microseconds);

/**
 * Retrieve the current time with context specific time offset adjustment.
 *
 * @param [in]  context         Library context
 * @param [out] timeret         Timestamp to fill in
 *
 * This function retrieves the system time of day with the context specific
 * time offset adjustment.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_timeofday(krb5_context context, krb5_timestamp *timeret);

/**
 * Check if a timestamp is within the allowed clock skew of the current time.
 *
 * @param [in]     context      Library context
 * @param [in]     date         Timestamp to check
 *
 * This function checks if @a date is close enough to the current time
 * according to the configured allowable clock skew.
 *
 * @version New in 1.10
 *
 * @retval 0 Success
 * @retval KRB5KRB_AP_ERR_SKEW @a date is not within allowable clock skew
 */
krb5_error_code KRB5_CALLCONV
krb5_check_clockskew(krb5_context context, krb5_timestamp date);

/**
 * Return all interface addresses for this host.
 *
 * @param [in]  context         Library context
 * @param [out] addr            Array of krb5_address pointers, ending with
 *                              NULL
 *
 * Use krb5_free_addresses() to free @a addr when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_os_localaddr(krb5_context context, krb5_address ***addr);

/**
 * Retrieve the default realm.
 *
 * @param [in]  context         Library context
 * @param [out] lrealm          Default realm name
 *
 * Retrieves the default realm to be used if no user-specified realm is
 * available.
 *
 * Use krb5_free_default_realm() to free @a lrealm when it is no longer needed.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_default_realm(krb5_context context, char **lrealm);

/**
 * Override the default realm for the specified context.
 *
 * @param [in]     context      Library context
 * @param [in]     lrealm       Realm name for the default realm
 *
 * If @a lrealm is NULL, clear the default realm setting.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_set_default_realm(krb5_context context, const char *lrealm);

/**
 * Free a default realm string returned by krb5_get_default_realm().
 *
 * @param [in] context          Library context
 * @param [in] lrealm           Realm to be freed
 */
void KRB5_CALLCONV
krb5_free_default_realm(krb5_context context, char *lrealm);

/**
 * Canonicalize a hostname, possibly using name service.
 *
 * @param [in]  context         Library context
 * @param [in]  host            Input hostname
 * @param [out] canonhost_out   Canonicalized hostname
 *
 * This function canonicalizes orig_hostname, possibly using name service
 * lookups if configuration permits.  Use krb5_free_string() to free @a
 * canonhost_out when it is no longer needed.
 *
 * @version New in 1.15
 */
krb5_error_code KRB5_CALLCONV
krb5_expand_hostname(krb5_context context, const char *host,
                     char **canonhost_out);

/**
 * Generate a full principal name from a service name.
 *
 * @param [in]  context         Library context
 * @param [in]  hostname        Host name, or NULL to use local host
 * @param [in]  sname           Service name, or NULL to use @c "host"
 * @param [in]  type            Principal type
 * @param [out] ret_princ       Generated principal
 *
 * This function converts a @a hostname and @a sname into @a krb5_principal
 * structure @a ret_princ.  The returned principal will be of the form @a
 * sname\/hostname\@REALM where REALM is determined by krb5_get_host_realm().
 * In some cases this may be the referral (empty) realm.
 *
 * The @a type can be one of the following:
 *
 * @li #KRB5_NT_SRV_HST canonicalizes the host name before looking up the
 * realm and generating the principal.
 *
 * @li #KRB5_NT_UNKNOWN accepts the hostname as given, and does not
 * canonicalize it.
 *
 * Use krb5_free_principal to free @a ret_princ when it is no longer needed.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_sname_to_principal(krb5_context context, const char *hostname, const char *sname,
                        krb5_int32 type, krb5_principal *ret_princ);

/**
 * Test whether a principal matches a matching principal.
 *
 * @param [in]  context         Library context
 * @param [in]  matching        Matching principal
 * @param [in]  princ           Principal to test
 *
 * @note A matching principal is a host-based principal with an empty realm
 * and/or second data component (hostname).  Profile configuration may cause
 * the hostname to be ignored even if it is present.  A principal matches a
 * matching principal if the former has the same non-empty (and non-ignored)
 * components of the latter.
 *
 * If @a matching is NULL, return TRUE.  If @a matching is not a matching
 * principal, return the value of krb5_principal_compare(context, matching,
 * princ).
 *
 * @return
 * TRUE if @a princ matches @a matching, FALSE otherwise.
 */
krb5_boolean KRB5_CALLCONV
krb5_sname_match(krb5_context context, krb5_const_principal matching,
                 krb5_const_principal princ);

/**
 * Change a password for an existing Kerberos account.
 *
 * @param [in]  context             Library context
 * @param [in]  creds               Credentials for kadmin/changepw service
 * @param [in]  newpw               New password
 * @param [out] result_code         Numeric error code from server
 * @param [out] result_code_string  String equivalent to @a result_code
 * @param [out] result_string       Change password response from the KDC
 *
 * Change the password for the existing principal identified by @a creds.
 *
 * The possible values of the output @a result_code are:
 *
 * @li #KRB5_KPASSWD_SUCCESS   (0) - success
 * @li #KRB5_KPASSWD_MALFORMED (1) - Malformed request error
 * @li #KRB5_KPASSWD_HARDERROR (2) - Server error
 * @li #KRB5_KPASSWD_AUTHERROR (3) - Authentication error
 * @li #KRB5_KPASSWD_SOFTERROR (4) - Password change rejected
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_change_password(krb5_context context, krb5_creds *creds,
                     const char *newpw, int *result_code,
                     krb5_data *result_code_string, krb5_data *result_string);

/**
 * Set a password for a principal using specified credentials.
 *
 * @param [in]  context              Library context
 * @param [in]  creds                Credentials for kadmin/changepw service
 * @param [in]  newpw                New password
 * @param [in]  change_password_for  Change the password for this principal
 * @param [out] result_code          Numeric error code from server
 * @param [out] result_code_string   String equivalent to @a result_code
 * @param [out] result_string        Data returned from the remote system
 *
 * This function uses the credentials @a creds to set the password @a newpw for
 * the principal @a change_password_for.  It implements the set password
 * operation of RFC 3244, for interoperability with Microsoft Windows
 * implementations.
 *
 * @note If @a change_password_for is NULL, the change is performed on the
 * current principal. If @a change_password_for is non-null, the change is
 * performed on the principal name passed in @a change_password_for.
 *
 * The error code and strings are returned in @a result_code,
 * @a result_code_string and @a result_string.
 *
 * @sa krb5_set_password_using_ccache()
 *
 * @retval
 * 0  Success and result_code is set to #KRB5_KPASSWD_SUCCESS.
 * @return
 * Kerberos error codes.
 */
krb5_error_code KRB5_CALLCONV
krb5_set_password(krb5_context context, krb5_creds *creds, const char *newpw,
                  krb5_principal change_password_for, int *result_code,
                  krb5_data *result_code_string, krb5_data *result_string);

/**
 * Set a password for a principal using cached credentials.
 *
 * @param [in]  context              Library context
 * @param [in]  ccache               Credential cache
 * @param [in]  newpw                New password
 * @param [in]  change_password_for  Change the password for this principal
 * @param [out] result_code          Numeric error code from server
 * @param [out] result_code_string   String equivalent to @a result_code
 * @param [out] result_string        Data returned from the remote system
 *
 * This function uses the cached credentials from @a ccache to set the password
 * @a newpw for the principal @a change_password_for.  It implements RFC 3244
 * set password operation (interoperable with MS Windows implementations) using
 * the credential cache.
 *
 * The error code and strings are returned in @a result_code,
 * @a result_code_string and @a result_string.
 *
 * @note If @a change_password_for is set to NULL, the change is performed on
 * the default principal in @a ccache. If @a change_password_for is non null,
 * the change is performed on the specified principal.
 *
 * @sa krb5_set_password()
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_set_password_using_ccache(krb5_context context, krb5_ccache ccache,
                               const char *newpw,
                               krb5_principal change_password_for,
                               int *result_code, krb5_data *result_code_string,
                               krb5_data *result_string);

/**
 * Get a result message for changing or setting a password.
 *
 * @param [in]  context            Library context
 * @param [in]  server_string      Data returned from the remote system
 * @param [out] message_out        A message displayable to the user
 *
 * This function processes the @a server_string returned in the @a
 * result_string parameter of krb5_change_password(), krb5_set_password(), and
 * related functions, and returns a displayable string.  If @a server_string
 * contains Active Directory structured policy information, it will be
 * converted into human-readable text.
 *
 * Use krb5_free_string() to free @a message_out when it is no longer needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 *
 * @version New in 1.11
 */
krb5_error_code KRB5_CALLCONV
krb5_chpw_message(krb5_context context, const krb5_data *server_string,
                  char **message_out);

/**
 * Retrieve configuration profile from the context.
 *
 * @param [in]  context         Library context
 * @param [out] profile         Pointer to data read from a configuration file
 *
 * This function creates a new @a profile object that reflects profile
 * in the supplied @a context.
 *
 * The @a profile object may be freed with profile_release() function.
 * See profile.h and profile API for more details.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_profile(krb5_context context, struct _profile_t ** profile);

#if KRB5_DEPRECATED
/** @deprecated Replaced by krb5_get_init_creds_password().*/
KRB5_ATTR_DEPRECATED krb5_error_code KRB5_CALLCONV
krb5_get_in_tkt_with_password(krb5_context context, krb5_flags options,
                              krb5_address *const *addrs, krb5_enctype *ktypes,
                              krb5_preauthtype *pre_auth_types,
                              const char *password, krb5_ccache ccache,
                              krb5_creds *creds, krb5_kdc_rep **ret_as_reply);

/** @deprecated Replaced by krb5_get_init_creds(). */
KRB5_ATTR_DEPRECATED krb5_error_code KRB5_CALLCONV
krb5_get_in_tkt_with_skey(krb5_context context, krb5_flags options,
                          krb5_address *const *addrs, krb5_enctype *ktypes,
                          krb5_preauthtype *pre_auth_types,
                          const krb5_keyblock *key, krb5_ccache ccache,
                          krb5_creds *creds, krb5_kdc_rep **ret_as_reply);

/** @deprecated Replaced by krb5_get_init_creds_keytab(). */
KRB5_ATTR_DEPRECATED krb5_error_code KRB5_CALLCONV
krb5_get_in_tkt_with_keytab(krb5_context context, krb5_flags options,
                            krb5_address *const *addrs, krb5_enctype *ktypes,
                            krb5_preauthtype *pre_auth_types,
                            krb5_keytab arg_keytab, krb5_ccache ccache,
                            krb5_creds *creds, krb5_kdc_rep **ret_as_reply);

#endif /* KRB5_DEPRECATED */

/**
 * Parse and decrypt a @c KRB_AP_REQ message.
 *
 * @param [in]     context        Library context
 * @param [in,out] auth_context   Pre-existing or newly created auth context
 * @param [in]     inbuf          AP-REQ message to be parsed
 * @param [in]     server         Matching principal for server, or NULL to
 *                                allow any principal in keytab
 * @param [in]     keytab         Key table, or NULL to use the default
 * @param [out]    ap_req_options If non-null, the AP-REQ flags on output
 * @param [out]    ticket         If non-null, ticket from the AP-REQ message
 *
 * This function parses, decrypts and verifies a AP-REQ message from @a inbuf
 * and stores the authenticator in @a auth_context.
 *
 * If a keyblock was specified in @a auth_context using
 * krb5_auth_con_setuseruserkey(), that key is used to decrypt the ticket in
 * AP-REQ message and @a keytab is ignored.  In this case, @a server should be
 * specified as a complete principal name to allow for proper transited-path
 * checking and replay cache selection.
 *
 * Otherwise, the decryption key is obtained from @a keytab, or from the
 * default keytab if it is NULL.  In this case, @a server may be a complete
 * principal name, a matching principal (see krb5_sname_match()), or NULL to
 * match any principal name.  The keys tried against the encrypted part of the
 * ticket are determined as follows:
 *
 * - If @a server is a complete principal name, then its entry in @a keytab is
 *   tried.
 * - Otherwise, if @a keytab is iterable, then all entries in @a keytab which
 *   match @a server are tried.
 * - Otherwise, the server principal in the ticket must match @a server, and
 *   its entry in @a keytab is tried.
 *
 * The client specified in the decrypted authenticator must match the client
 * specified in the decrypted ticket.
 *
 * If the @a remote_addr field of @a auth_context is set, the request must come
 * from that address.
 *
 * If a replay cache handle is provided in the @a auth_context, the
 * authenticator and ticket are verified against it.  If no conflict is found,
 * the new authenticator is then stored in the replay cache of @a auth_context.
 *
 * Various other checks are performed on the decoded data, including
 * cross-realm policy, clockskew, and ticket validation times.
 *
 * On success the authenticator, subkey, and remote sequence number of the
 * request are stored in @a auth_context. If the #AP_OPTS_MUTUAL_REQUIRED
 * bit is set, the local sequence number is XORed with the remote sequence
 * number in the request.
 *
 * Use krb5_free_ticket() to free @a ticket when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_req(krb5_context context, krb5_auth_context *auth_context,
            const krb5_data *inbuf, krb5_const_principal server,
            krb5_keytab keytab, krb5_flags *ap_req_options,
            krb5_ticket **ticket);

/**
 * Retrieve a service key from a key table.
 *
 * @param [in]  context     Library context
 * @param [in]  keyprocarg  Name of a key table (NULL to use default name)
 * @param [in]  principal   Service principal
 * @param [in]  vno         Key version number (0 for highest available)
 * @param [in]  enctype     Encryption type (0 for any type)
 * @param [out] key         Service key from key table
 *
 * Open and search the specified key table for the entry identified by @a
 * principal, @a enctype, and @a vno. If no key is found, return an error code.
 *
 * The default key table is used, unless @a keyprocarg is non-null.
 * @a keyprocarg designates a specific key table.
 *
 * Use krb5_free_keyblock() to free @a key when it is no longer needed.
 *
 * @retval
 * 0 Success
 * @return Kerberos error code if not found or @a keyprocarg is invalid.
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_read_service_key(krb5_context context, krb5_pointer keyprocarg,
                         krb5_principal principal, krb5_kvno vno,
                         krb5_enctype enctype, krb5_keyblock **key);

/**
 * Format a @c KRB-SAFE message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  userdata        User data in the message
 * @param [out] outbuf          Formatted @c KRB-SAFE buffer
 * @param [out] outdata         Replay data. Specify NULL if not needed
 *
 * This function creates an integrity protected @c KRB-SAFE message
 * using data supplied by the application.
 *
 * Fields in @a auth_context specify the checksum type, the keyblock that
 * can be used to seed the checksum, full addresses (host and port) for
 * the sender and receiver, and @ref KRB5_AUTH_CONTEXT flags.
 *
 * The local address in @a auth_context must be set, and is used to form the
 * sender address used in the KRB-SAFE message.  The remote address is
 * optional; if specified, it will be used to form the receiver address used in
 * the message.
 *
 * If #KRB5_AUTH_CONTEXT_DO_TIME flag is set in the @a auth_context, an entry
 * describing the message is entered in the replay cache @a
 * auth_context->rcache which enables the caller to detect if this message is
 * reflected by an attacker.  If #KRB5_AUTH_CONTEXT_DO_TIME is not set, the
 * replay cache is not used.
 *
 * If either #KRB5_AUTH_CONTEXT_DO_SEQUENCE or
 * #KRB5_AUTH_CONTEXT_RET_SEQUENCE is set, the @a auth_context local sequence
 * number will be placed in @a outdata as its sequence number.
 *
 * @note The @a outdata argument is required if #KRB5_AUTH_CONTEXT_RET_TIME or
 *       #KRB5_AUTH_CONTEXT_RET_SEQUENCE flag is set in the @a auth_context.
 *
 * Use krb5_free_data_contents() to free @a outbuf when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_safe(krb5_context context, krb5_auth_context auth_context,
             const krb5_data *userdata, krb5_data *outbuf,
             krb5_replay_data *outdata);

/**
 * Format a @c KRB-PRIV message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  userdata        User data for @c KRB-PRIV message
 * @param [out] outbuf          Formatted @c KRB-PRIV message
 * @param [out] outdata         Replay cache handle (NULL if not needed)
 *
 * This function is similar to krb5_mk_safe(), but the message is encrypted and
 * integrity-protected, not just integrity-protected.
 *
 * The local address in @a auth_context must be set, and is used to form the
 * sender address used in the KRB-SAFE message.  The remote address is
 * optional; if specified, it will be used to form the receiver address used in
 * the message.
 *
 * @note If the #KRB5_AUTH_CONTEXT_RET_TIME or
 * #KRB5_AUTH_CONTEXT_RET_SEQUENCE flag is set in @a auth_context, the @a
 * outdata is required.
 *
 * @note The flags from @a auth_context specify whether sequence numbers or
 * timestamps will be used to identify the message.  Valid values are:
 *
 * @li #KRB5_AUTH_CONTEXT_DO_TIME      - Use timestamps in @a outdata
 * @li #KRB5_AUTH_CONTEXT_RET_TIME     - Copy timestamp to @a outdata.
 * @li #KRB5_AUTH_CONTEXT_DO_SEQUENCE  - Use local sequence numbers from
 *                                       @a auth_context in replay cache.
 * @li #KRB5_AUTH_CONTEXT_RET_SEQUENCE - Use local sequence numbers from
 *                                       @a auth_context as a sequence number
 *                                       in the encrypted message @a outbuf.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_priv(krb5_context context, krb5_auth_context auth_context,
             const krb5_data *userdata, krb5_data *outbuf,
             krb5_replay_data *outdata);

/**
 * Client function for @c sendauth protocol.
 *
 * @param [in]     context        Library context
 * @param [in,out] auth_context   Pre-existing or newly created auth context
 * @param [in]     fd             File descriptor that describes network socket
 * @param [in]     appl_version   Application protocol version to be matched
 *                                with the receiver's application version
 * @param [in]     client         Client principal
 * @param [in]     server         Server principal
 * @param [in]     ap_req_options @ref AP_OPTS options
 * @param [in]     in_data        Data to be sent to the server
 * @param [in]     in_creds       Input credentials, or NULL to use @a ccache
 * @param [in]     ccache         Credential cache
 * @param [out]    error          If non-null, contains KRB_ERROR message
 *                                returned from server
 * @param [out]    rep_result     If non-null and @a ap_req_options is
 *                                #AP_OPTS_MUTUAL_REQUIRED, contains the result
 *                                of mutual authentication exchange
 * @param [out]    out_creds      If non-null, the retrieved credentials
 *
 * This function performs the client side of a sendauth/recvauth exchange by
 * sending and receiving messages over @a fd.
 *
 * Credentials may be specified in three ways:
 *
 * @li If @a in_creds is NULL, credentials are obtained with
 * krb5_get_credentials() using the principals @a client and @a server.  @a
 * server must be non-null; @a client may NULL to use the default principal of
 * @a ccache.
 *
 * @li If @a in_creds is non-null, but does not contain a ticket, credentials
 * for the exchange are obtained with krb5_get_credentials() using @a in_creds.
 * In this case, the values of @a client and @a server are unused.
 *
 * @li If @a in_creds is a complete credentials structure, it used directly.
 * In this case, the values of @a client, @a server, and @a ccache are unused.
 *
 * If the server is using a different application protocol than that specified
 * in @a appl_version, an error will be returned.
 *
 * Use krb5_free_creds() to free @a out_creds, krb5_free_ap_rep_enc_part() to
 * free @a rep_result, and krb5_free_error() to free @a error when they are no
 * longer needed.
 *
 * @sa krb5_recvauth()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_sendauth(krb5_context context, krb5_auth_context *auth_context,
              krb5_pointer fd, char *appl_version, krb5_principal client,
              krb5_principal server, krb5_flags ap_req_options,
              krb5_data *in_data, krb5_creds *in_creds, krb5_ccache ccache,
              krb5_error **error, krb5_ap_rep_enc_part **rep_result,
              krb5_creds **out_creds);

/**
 * Server function for @a sendauth protocol.
 *
 * @param [in]     context      Library context
 * @param [in,out] auth_context Pre-existing or newly created auth context
 * @param [in]     fd           File descriptor
 * @param [in]     appl_version Application protocol version to be matched
 *                              against the client's application version
 * @param [in]     server       Server principal (NULL for any in @a keytab)
 * @param [in]     flags        Additional specifications
 * @param [in]     keytab       Key table containing service keys
 * @param [out]    ticket       Ticket (NULL if not needed)
 *
 * This function performs the server side of a sendauth/recvauth exchange by
 * sending and receiving messages over @a fd.
 *
 * Use krb5_free_ticket() to free @a ticket when it is no longer needed.
 *
 * @sa krb5_sendauth()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_recvauth(krb5_context context, krb5_auth_context *auth_context,
              krb5_pointer fd, char *appl_version, krb5_principal server,
              krb5_int32 flags, krb5_keytab keytab, krb5_ticket **ticket);

/**
 * Server function for @a sendauth protocol with version parameter.
 *
 * @param [in]     context      Library context
 * @param [in,out] auth_context Pre-existing or newly created auth context
 * @param [in]     fd           File descriptor
 * @param [in]     server       Server principal (NULL for any in @a keytab)
 * @param [in]     flags        Additional specifications
 * @param [in]     keytab       Decryption key
 * @param [out]    ticket       Ticket (NULL if not needed)
 * @param [out]    version      sendauth protocol version (NULL if not needed)
 *
 * This function is similar to krb5_recvauth() with the additional output
 * information place into @a version.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_recvauth_version(krb5_context context,
                      krb5_auth_context *auth_context,
                      krb5_pointer fd,
                      krb5_principal server,
                      krb5_int32 flags,
                      krb5_keytab keytab,
                      krb5_ticket **ticket,
                      krb5_data *version);

/**
 * Format a @c KRB-CRED message for an array of credentials.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  ppcreds         Null-terminated array of credentials
 * @param [out] ppdata          Encoded credentials
 * @param [out] outdata         Replay cache information (NULL if not needed)
 *
 * This function takes an array of credentials @a ppcreds and formats
 * a @c KRB-CRED message @a ppdata to pass to krb5_rd_cred().
 *
 * @note If the #KRB5_AUTH_CONTEXT_RET_TIME or #KRB5_AUTH_CONTEXT_RET_SEQUENCE
 *       flag is set in @a auth_context, @a outdata is required.
 *
 * The message will be encrypted using the send subkey of @a auth_context if it
 * is present, or the session key otherwise.
 *
 * @retval
 *  0 Success
 * @retval
 *  ENOMEM Insufficient memory
 * @retval
 *   KRB5_RC_REQUIRED Message replay detection requires @a rcache parameter
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_ncred(krb5_context context, krb5_auth_context auth_context,
              krb5_creds **ppcreds, krb5_data **ppdata,
              krb5_replay_data *outdata);

/**
 * Format a @c KRB-CRED message for a single set of credentials.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  pcreds          Pointer to credentials
 * @param [out] ppdata          Encoded credentials
 * @param [out] outdata         Replay cache data (NULL if not needed)
 *
 * This is a convenience function that calls krb5_mk_ncred() with a single set
 * of credentials.
 *
 * @retval
 * 0 Success
 * @retval
 *  ENOMEM Insufficient memory
 * @retval
 *  KRB5_RC_REQUIRED   Message replay detection requires @a rcache parameter
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_1cred(krb5_context context, krb5_auth_context auth_context,
              krb5_creds *pcreds, krb5_data **ppdata,
              krb5_replay_data *outdata);

/**
 * Read and validate a @c KRB-CRED message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  pcreddata       @c KRB-CRED message
 * @param [out] pppcreds        Null-terminated array of forwarded credentials
 * @param [out] outdata         Replay data (NULL if not needed)
 *
 * @note The @a outdata argument is required if #KRB5_AUTH_CONTEXT_RET_TIME or
 *       #KRB5_AUTH_CONTEXT_RET_SEQUENCE flag is set in the @a auth_context.`
 *
 * @a pcreddata will be decrypted using the receiving subkey if it is present
 * in @a auth_context, or the session key if the receiving subkey is not
 * present or fails to decrypt the message.
 *
 * Use krb5_free_tgt_creds() to free @a pppcreds when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_cred(krb5_context context, krb5_auth_context auth_context,
             krb5_data *pcreddata, krb5_creds ***pppcreds,
             krb5_replay_data *outdata);

/**
 * Get a forwarded TGT and format a @c KRB-CRED message.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] rhost            Remote host
 * @param [in] client           Client principal of TGT
 * @param [in] server           Principal of server to receive TGT
 * @param [in] cc               Credential cache handle (NULL to use default)
 * @param [in] forwardable      Whether TGT should be forwardable
 * @param [out] outbuf          KRB-CRED message
 *
 * Get a TGT for use at the remote host @a rhost and format it into a KRB-CRED
 * message.  If @a rhost is NULL and @a server is of type #KRB5_NT_SRV_HST,
 * the second component of @a server will be used.
 *
 * @retval
 *  0 Success
 * @retval
 *   ENOMEM Insufficient memory
 * @retval
 *   KRB5_PRINC_NOMATCH Requested principal and ticket do not match
 * @retval
 *   KRB5_NO_TKT_SUPPLIED Request did not supply a ticket
 * @retval
 *   KRB5_CC_BADNAME Credential cache name or principal name malformed
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_fwd_tgt_creds(krb5_context context, krb5_auth_context auth_context,
                   const char *rhost, krb5_principal client,
                   krb5_principal server, krb5_ccache cc, int forwardable,
                   krb5_data *outbuf);

/**
 * Create and initialize an authentication context.
 *
 * @param [in]  context         Library context
 * @param [out] auth_context    Authentication context
 *
 * This function creates an authentication context to hold configuration and
 * state relevant to krb5 functions for authenticating principals and
 * protecting messages once authentication has occurred.
 *
 * By default, flags for the context are set to enable the use of the replay
 * cache (#KRB5_AUTH_CONTEXT_DO_TIME), but not sequence numbers.  Use
 * krb5_auth_con_setflags() to change the flags.
 *
 * The allocated @a auth_context must be freed with krb5_auth_con_free() when
 * it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_init(krb5_context context, krb5_auth_context *auth_context);

/**
 * Free a krb5_auth_context structure.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context to be freed
 *
 * This function frees an auth context allocated by krb5_auth_con_init().
 *
 * @retval 0  (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_free(krb5_context context, krb5_auth_context auth_context);

/**
 * Set a flags field in a krb5_auth_context structure.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] flags            Flags bit mask
 *
 * Valid values for @a flags are:
 * @li #KRB5_AUTH_CONTEXT_DO_TIME Use timestamps
 * @li #KRB5_AUTH_CONTEXT_RET_TIME Save timestamps
 * @li #KRB5_AUTH_CONTEXT_DO_SEQUENCE Use sequence numbers
 * @li #KRB5_AUTH_CONTEXT_RET_SEQUENCE Save sequence numbers
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setflags(krb5_context context, krb5_auth_context auth_context, krb5_int32 flags);

/**
 * Retrieve flags from a krb5_auth_context structure.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] flags           Flags bit mask
 *
 * Valid values for @a flags are:
 * @li #KRB5_AUTH_CONTEXT_DO_TIME Use timestamps
 * @li #KRB5_AUTH_CONTEXT_RET_TIME Save timestamps
 * @li #KRB5_AUTH_CONTEXT_DO_SEQUENCE Use sequence numbers
 * @li #KRB5_AUTH_CONTEXT_RET_SEQUENCE Save sequence numbers
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getflags(krb5_context context, krb5_auth_context auth_context,
                       krb5_int32 *flags);

/**
 * Set a checksum callback in an auth context.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] func             Checksum callback
 * @param [in] data             Callback argument
 *
 * Set a callback to obtain checksum data in krb5_mk_req().  The callback will
 * be invoked after the subkey and local sequence number are stored in @a
 * auth_context.
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_set_checksum_func( krb5_context context,
                                 krb5_auth_context  auth_context,
                                 krb5_mk_req_checksum_func func,
                                 void *data);

/**
 * Get the checksum callback from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] func            Checksum callback
 * @param [out] data            Callback argument
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_get_checksum_func( krb5_context context,
                                 krb5_auth_context auth_context,
                                 krb5_mk_req_checksum_func *func,
                                 void **data);

/**
 * Set the local and remote addresses in an auth context.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] local_addr       Local address
 * @param [in] remote_addr      Remote address
 *
 * This function releases the storage assigned to the contents of the local and
 * remote addresses of @a auth_context and then sets them to @a local_addr and
 * @a remote_addr respectively.
 *
 * @sa krb5_auth_con_genaddrs()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV_WRONG
krb5_auth_con_setaddrs(krb5_context context, krb5_auth_context auth_context,
                       krb5_address *local_addr, krb5_address *remote_addr);

/**
 * Retrieve address fields from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] local_addr      Local address (NULL if not needed)
 * @param [out] remote_addr     Remote address (NULL if not needed)
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getaddrs(krb5_context context, krb5_auth_context auth_context,
                       krb5_address **local_addr, krb5_address **remote_addr);

/**
 * Set local and remote port fields in an auth context.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] local_port       Local port
 * @param [in] remote_port      Remote port
 *
 * This function releases the storage assigned to the contents of the local and
 * remote ports of @a auth_context and then sets them to @a local_port and @a
 * remote_port respectively.
 *
 * @sa krb5_auth_con_genaddrs()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setports(krb5_context context, krb5_auth_context auth_context,
                       krb5_address *local_port, krb5_address *remote_port);

/**
 * Set the session key in an auth context.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] keyblock         User key
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setuseruserkey(krb5_context context, krb5_auth_context auth_context,
                             krb5_keyblock *keyblock);

/**
 * Retrieve the session key from an auth context as a keyblock.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] keyblock        Session key
 *
 * This function creates a keyblock containing the session key from @a
 * auth_context.  Use krb5_free_keyblock() to free @a keyblock when it is no
 * longer needed
 *
 * @retval 0 Success. Otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getkey(krb5_context context, krb5_auth_context auth_context,
                     krb5_keyblock **keyblock);

/**
 * Retrieve the session key from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] key             Session key
 *
 * This function sets @a key to the session key from @a auth_context.  Use
 * krb5_k_free_key() to release @a key when it is no longer needed.
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getkey_k(krb5_context context, krb5_auth_context auth_context,
                       krb5_key *key);

/**
 * Retrieve the send subkey from an auth context as a keyblock.
 *
 * @param [in]  ctx             Library context
 * @param [in]  ac              Authentication context
 * @param [out] keyblock        Send subkey
 *
 * This function creates a keyblock containing the send subkey from @a
 * auth_context.  Use krb5_free_keyblock() to free @a keyblock when it is no
 * longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getsendsubkey(krb5_context ctx, krb5_auth_context ac, krb5_keyblock **keyblock);

/**
 * Retrieve the send subkey from an auth context.
 *
 * @param [in]  ctx             Library context
 * @param [in]  ac              Authentication context
 * @param [out] key             Send subkey
 *
 * This function sets @a key to the send subkey from @a auth_context.  Use
 * krb5_k_free_key() to release @a key when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getsendsubkey_k(krb5_context ctx, krb5_auth_context ac,
                              krb5_key *key);

/**
 * Retrieve the receiving subkey from an auth context as a keyblock.
 *
 * @param [in]  ctx             Library context
 * @param [in]  ac              Authentication context
 * @param [out] keyblock        Receiving subkey
 *
 * This function creates a keyblock containing the receiving subkey from @a
 * auth_context.  Use krb5_free_keyblock() to free @a keyblock when it is no
 * longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getrecvsubkey(krb5_context ctx, krb5_auth_context ac, krb5_keyblock **keyblock);

/**
 * Retrieve the receiving subkey from an auth context as a keyblock.
 *
 * @param [in]  ctx             Library context
 * @param [in]  ac              Authentication context
 * @param [out] key             Receiving subkey
 *
 * This function sets @a key to the receiving subkey from @a auth_context.  Use
 * krb5_k_free_key() to release @a key when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getrecvsubkey_k(krb5_context ctx, krb5_auth_context ac, krb5_key *key);

/**
 * Set the send subkey in an auth context with a keyblock.
 *
 * @param [in] ctx              Library context
 * @param [in] ac               Authentication context
 * @param [in] keyblock         Send subkey
 *
 * This function sets the send subkey in @a ac to a copy of @a keyblock.
 *
 * @retval 0 Success. Otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setsendsubkey(krb5_context ctx, krb5_auth_context ac,
                            krb5_keyblock *keyblock);

/**
 * Set the send subkey in an auth context.
 *
 * @param [in]  ctx             Library context
 * @param [in]  ac              Authentication context
 * @param [out] key             Send subkey
 *
 * This function sets the send subkey in @a ac to @a key, incrementing its
 * reference count.
 *
 * @version New in 1.9
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setsendsubkey_k(krb5_context ctx, krb5_auth_context ac, krb5_key key);

/**
 * Set the receiving subkey in an auth context with a keyblock.
 *
 * @param [in] ctx              Library context
 * @param [in] ac               Authentication context
 * @param [in] keyblock         Receiving subkey
 *
 * This function sets the receiving subkey in @a ac to a copy of @a keyblock.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setrecvsubkey(krb5_context ctx, krb5_auth_context ac,
                            krb5_keyblock *keyblock);

/**
 * Set the receiving subkey in an auth context.
 *
 * @param [in] ctx              Library context
 * @param [in] ac               Authentication context
 * @param [in] key              Receiving subkey
 *
 * This function sets the receiving subkey in @a ac to @a key, incrementing its
 * reference count.
 *
 * @version New in 1.9
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setrecvsubkey_k(krb5_context ctx, krb5_auth_context ac,
                              krb5_key key);

#if KRB5_DEPRECATED
/** @deprecated Replaced by krb5_auth_con_getsendsubkey(). */
KRB5_ATTR_DEPRECATED krb5_error_code KRB5_CALLCONV
krb5_auth_con_getlocalsubkey(krb5_context context, krb5_auth_context auth_context,
                             krb5_keyblock **keyblock);

/** @deprecated Replaced by krb5_auth_con_getrecvsubkey(). */
KRB5_ATTR_DEPRECATED krb5_error_code KRB5_CALLCONV
krb5_auth_con_getremotesubkey(krb5_context context, krb5_auth_context auth_context,
                              krb5_keyblock **keyblock);
#endif

/**
 * Retrieve the local sequence number from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] seqnumber       Local sequence number
 *
 * Retrieve the local sequence number from @a auth_context and return it in @a
 * seqnumber.  The #KRB5_AUTH_CONTEXT_DO_SEQUENCE flag must be set in @a
 * auth_context for this function to be useful.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getlocalseqnumber(krb5_context context, krb5_auth_context auth_context,
                                krb5_int32 *seqnumber);

/**
 * Retrieve the remote sequence number from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] seqnumber       Remote sequence number
 *
 * Retrieve the remote sequence number from @a auth_context and return it in @a
 * seqnumber.  The #KRB5_AUTH_CONTEXT_DO_SEQUENCE flag must be set in @a
 * auth_context for this function to be useful.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getremoteseqnumber(krb5_context context, krb5_auth_context auth_context,
                                 krb5_int32 *seqnumber);

/**
 * Cause an auth context to use cipher state.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 *
 * Prepare @a auth_context to use cipher state when krb5_mk_priv() or
 * krb5_rd_priv() encrypt or decrypt data.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_initivector(krb5_context context, krb5_auth_context auth_context);

/**
 * Set the replay cache in an auth context.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] rcache           Replay cache haddle
 *
 * This function sets the replay cache in @a auth_context to @a rcache.  @a
 * rcache will be closed when @a auth_context is freed, so the caller should
 * relinguish that responsibility.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setrcache(krb5_context context, krb5_auth_context auth_context,
                        krb5_rcache rcache);

/**
 * Retrieve the replay cache from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] rcache          Replay cache handle
 *
 * This function fetches the replay cache from @a auth_context.  The caller
 * should not close @a rcache.
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV_WRONG
krb5_auth_con_getrcache(krb5_context context, krb5_auth_context auth_context,
                        krb5_rcache *rcache);

/**
 * Retrieve the authenticator from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] authenticator   Authenticator
 *
 * Use krb5_free_authenticator() to free @a authenticator when it is no longer
 * needed.
 *
 * @retval 0 Success. Otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getauthenticator(krb5_context context, krb5_auth_context auth_context,
                               krb5_authenticator **authenticator);

/**
 * Set checksum type in an an auth context.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] cksumtype        Checksum type
 *
 * This function sets the checksum type in @a auth_context to be used by
 * krb5_mk_req() for the authenticator checksum.
 *
 * @retval 0 Success. Otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_set_req_cksumtype(krb5_context context, krb5_auth_context auth_context,
                                krb5_cksumtype cksumtype);

#define KRB5_REALM_BRANCH_CHAR '.'

/*
 * end "func-proto.h"
 */

/*
 * begin stuff from libos.h
 */

/**
 * @brief Read a password from keyboard input.
 *
 * @param [in]     context      Library context
 * @param [in]     prompt       First user prompt when reading password
 * @param [in]     prompt2      Second user prompt (NULL to prompt only once)
 * @param [out]    return_pwd   Returned password
 * @param [in,out] size_return  On input, maximum size of password; on output,
 *                              size of password read
 *
 * This function reads a password from keyboard input and stores it in @a
 * return_pwd.  @a size_return should be set by the caller to the amount of
 * storage space available in @a return_pwd; on successful return, it will be
 * set to the length of the password read.
 *
 * @a prompt is printed to the terminal, followed by ": ", and then a password
 * is read from the keyboard.
 *
 * If @a prompt2 is NULL, the password is read only once.  Otherwise, @a
 * prompt2 is printed to the terminal and a second password is read.  If the
 * two passwords entered are not identical, KRB5_LIBOS_BADPWDMATCH is returned.
 *
 * Echoing is turned off when the password is read.
 *
 * @retval
 *  0   Success
 * @return
 * Error in reading or verifying the password
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_read_password(krb5_context context,
                   const char *prompt, const char *prompt2,
                   char *return_pwd, unsigned int *size_return);

/**
 * Convert a principal name to a local name.
 *
 * @param [in]  context         Library context
 * @param [in]  aname           Principal name
 * @param [in]  lnsize_in       Space available in @a lname
 * @param [out] lname           Local name buffer to be filled in
 *
 * If @a aname does not correspond to any local account, KRB5_LNAME_NOTRANS is
 * returned.  If @a lnsize_in is too small for the local name,
 * KRB5_CONFIG_NOTENUFSPACE is returned.
 *
 * Local names, rather than principal names, can be used by programs that
 * translate to an environment-specific name (for example, a user account
 * name).
 *
 * @retval
 * 0  Success
 * @retval
 *  System errors
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_aname_to_localname(krb5_context context, krb5_const_principal aname,
                        int lnsize_in, char *lname);

/**
 * Get the Kerberos realm names for a host.
 *
 * @param [in]  context         Library context
 * @param [in]  host            Host name (or NULL)
 * @param [out] realmsp         Null-terminated list of realm names
 *
 * Fill in @a realmsp with a pointer to a null-terminated list of realm names.
 * If there are no known realms for the host, a list containing the referral
 * (empty) realm is returned.
 *
 * If @a host is NULL, the local host's realms are determined.
 *
 * Use krb5_free_host_realm() to release @a realmsp when it is no longer
 * needed.
 *
 * @retval
 *  0   Success
 * @retval
 *  ENOMEM  Insufficient memory
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_host_realm(krb5_context context, const char *host, char ***realmsp);

/**
 *
 * @param [in] context           Library context
 * @param [in] hdata             Host name (or NULL)
 * @param [out] realmsp          Null-terminated list of realm names
 *
 * Fill in @a realmsp with a pointer to a null-terminated list of realm names
 * obtained through heuristics or insecure resolution methods which have lower
 * priority than KDC referrals.
 *
 * If @a host is NULL, the local host's realms are determined.
 *
 * Use krb5_free_host_realm() to release @a realmsp when it is no longer
 * needed.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_fallback_host_realm(krb5_context context,
                             krb5_data *hdata, char ***realmsp);

/**
 * Free the memory allocated by krb5_get_host_realm().
 *
 * @param [in] context          Library context
 * @param [in] realmlist        List of realm names to be released
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_free_host_realm(krb5_context context, char *const *realmlist);

/**
 * Determine if a principal is authorized to log in as a local user.
 *
 * @param [in] context          Library context
 * @param [in] principal        Principal name
 * @param [in] luser            Local username
 *
 * Determine whether @a principal is authorized to log in as a local user @a
 * luser.
 *
 * @retval
 * TRUE Principal is authorized to log in as user; FALSE otherwise.
 */
krb5_boolean KRB5_CALLCONV
krb5_kuserok(krb5_context context, krb5_principal principal, const char *luser);

/**
 * Generate auth context addresses from a connected socket.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] infd             Connected socket descriptor
 * @param [in] flags            Flags
 *
 * This function sets the local and/or remote addresses in @a auth_context
 * based on the local and remote endpoints of the socket @a infd.  The
 * following flags determine the operations performed:
 *
 * @li #KRB5_AUTH_CONTEXT_GENERATE_LOCAL_ADDR   Generate local address.
 * @li #KRB5_AUTH_CONTEXT_GENERATE_REMOTE_ADDR  Generate remote address.
 * @li #KRB5_AUTH_CONTEXT_GENERATE_LOCAL_FULL_ADDR  Generate local address and port.
 * @li #KRB5_AUTH_CONTEXT_GENERATE_REMOTE_FULL_ADDR Generate remote address and port.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_genaddrs(krb5_context context, krb5_auth_context auth_context,
                       int infd, int flags);

/**
 * Set time offset field in a krb5_context structure.
 *
 * @param [in] context          Library context
 * @param [in] seconds          Real time, seconds portion
 * @param [in] microseconds     Real time, microseconds portion
 *
 * This function sets the time offset in @a context to the difference between
 * the system time and the real time as determined by @a seconds and @a
 * microseconds.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_set_real_time(krb5_context context, krb5_timestamp seconds,
                   krb5_int32 microseconds);

/**
 * Return the time offsets from the os context.
 *
 * @param [in]  context         Library context
 * @param [out] seconds         Time offset, seconds portion
 * @param [out] microseconds    Time offset, microseconds portion
 *
 * This function returns the time offsets in @a context.
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_time_offsets(krb5_context context, krb5_timestamp *seconds, krb5_int32 *microseconds);

/* str_conv.c */
/**
 * Convert a string to an encryption type.
 *
 * @param [in]  string          String to convert to an encryption type
 * @param [out] enctypep        Encryption type
 *
 * @retval 0  Success; otherwise - EINVAL
 */
krb5_error_code KRB5_CALLCONV
krb5_string_to_enctype(char *string, krb5_enctype *enctypep);

/**
 * Convert a string to a salt type.
 *
 * @param [in]  string          String to convert to an encryption type
 * @param [out] salttypep       Salt type to be filled in
 *
 * @retval 0  Success; otherwise - EINVAL
 */
krb5_error_code KRB5_CALLCONV
krb5_string_to_salttype(char *string, krb5_int32 *salttypep);

/**
 * Convert a string to a checksum type.
 *
 * @param [in]  string          String to be converted
 * @param [out] cksumtypep      Checksum type to be filled in
 *
 * @retval 0  Success; otherwise - EINVAL
 */
krb5_error_code KRB5_CALLCONV
krb5_string_to_cksumtype(char *string, krb5_cksumtype *cksumtypep);

/**
 * Convert a string to a timestamp.
 *
 * @param [in]  string          String to be converted
 * @param [out] timestampp      Pointer to timestamp
 *
 * @retval 0  Success; otherwise - EINVAL
 */
krb5_error_code KRB5_CALLCONV
krb5_string_to_timestamp(char *string, krb5_timestamp *timestampp);

/**
 * Convert a string to a delta time value.
 *
 * @param [in]  string          String to be converted
 * @param [out] deltatp         Delta time to be filled in
 *
 * @retval 0  Success; otherwise - KRB5_DELTAT_BADFORMAT
 */
krb5_error_code KRB5_CALLCONV
krb5_string_to_deltat(char *string, krb5_deltat *deltatp);

/**
 * Convert an encryption type to a string.
 *
 * @param [in]  enctype         Encryption type
 * @param [out] buffer          Buffer to hold encryption type string
 * @param [in]  buflen          Storage available in @a buffer
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_enctype_to_string(krb5_enctype enctype, char *buffer, size_t buflen);

/**
 * Convert an encryption type to a name or alias.
 *
 * @param [in]  enctype         Encryption type
 * @param [in]  shortest        Flag
 * @param [out] buffer          Buffer to hold encryption type string
 * @param [in]  buflen          Storage available in @a buffer
 *
 * If @a shortest is FALSE, this function returns the enctype's canonical name
 * (like "aes128-cts-hmac-sha1-96").  If @a shortest is TRUE, it return the
 * enctype's shortest alias (like "aes128-cts").
 *
 * @version New in 1.9
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_enctype_to_name(krb5_enctype enctype, krb5_boolean shortest,
                     char *buffer, size_t buflen);

/**
 * Convert a salt type to a string.
 *
 * @param [in]  salttype        Salttype to convert
 * @param [out] buffer          Buffer to receive the converted string
 * @param [in]  buflen          Storage available in @a buffer
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_salttype_to_string(krb5_int32 salttype, char *buffer, size_t buflen);

/**
 * Convert a checksum type to a string.
 *
 * @param [in]  cksumtype       Checksum type
 * @param [out] buffer          Buffer to hold converted checksum type
 * @param [in]  buflen          Storage available in @a buffer
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cksumtype_to_string(krb5_cksumtype cksumtype, char *buffer, size_t buflen);

/**
 * Convert a timestamp to a string.
 *
 * @param [in]  timestamp       Timestamp to convert
 * @param [out] buffer          Buffer to hold converted timestamp
 * @param [in]  buflen          Storage available in @a buffer
 *
 * The string is returned in the locale's appropriate date and time
 * representation.
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_timestamp_to_string(krb5_timestamp timestamp, char *buffer, size_t buflen);

/**
 * Convert a timestamp to a string, with optional output padding
 *
 * @param [in]  timestamp       Timestamp to convert
 * @param [out] buffer          Buffer to hold the converted timestamp
 * @param [in]  buflen          Length of buffer
 * @param [in]  pad             Optional value to pad @a buffer if converted
 *                              timestamp does not fill it
 *
 * If @a pad is not NULL, @a buffer is padded out to @a buflen - 1 characters
 * with the value of *@a pad.
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_timestamp_to_sfstring(krb5_timestamp timestamp, char *buffer,
                           size_t buflen, char *pad);

/**
 * Convert a relative time value to a string.
 *
 * @param [in]  deltat          Relative time value to convert
 * @param [out] buffer          Buffer to hold time string
 * @param [in]  buflen          Storage available in @a buffer
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_deltat_to_string(krb5_deltat deltat, char *buffer, size_t buflen);

/* The name of the Kerberos ticket granting service... and its size */
#define KRB5_TGS_NAME           "krbtgt"
#define KRB5_TGS_NAME_SIZE      6

/* flags for recvauth */
#define KRB5_RECVAUTH_SKIP_VERSION      0x0001
#define KRB5_RECVAUTH_BADAUTHVERS       0x0002
/* initial ticket api functions */

/** Text for prompt used in prompter callback function.  */
typedef struct _krb5_prompt {
    char *prompt;      /**< The prompt to show to the user */
    int hidden;        /**< Boolean; informative prompt or hidden (e.g. PIN) */
    krb5_data *reply;  /**< Must be allocated before call to  prompt routine */
} krb5_prompt;

/** Pointer to a prompter callback function. */
typedef krb5_error_code
(KRB5_CALLCONV *krb5_prompter_fct)(krb5_context context, void *data,
                                   const char *name, const char *banner,
                                   int num_prompts, krb5_prompt prompts[]);

/**
 * Prompt user for password.
 *
 * @param [in] context          Library context
 * @param      data             Unused (callback argument)
 * @param [in] name             Name to output during prompt
 * @param [in] banner           Banner to output during prompt
 * @param [in] num_prompts      Number of prompts in @a prompts
 * @param [in] prompts          Array of prompts and replies
 *
 * This function is intended to be used as a prompter callback for
 * krb5_get_init_creds_password() or krb5_init_creds_init().
 *
 * Writes @a name and @a banner to stdout, each followed by a newline, then
 * writes each prompt field in the @a prompts array, followed by ": ", and sets
 * the reply field of the entry to a line of input read from stdin.  If the
 * hidden flag is set for a prompt, then terminal echoing is turned off when
 * input is read.
 *
 * @retval
 *  0   Success
 * @return
 * Kerberos error codes
 *
 */
krb5_error_code KRB5_CALLCONV
krb5_prompter_posix(krb5_context context, void *data, const char *name,
                    const char *banner, int num_prompts,
                    krb5_prompt prompts[]);

/**
 * Long-term password responder question
 *
 * This question is asked when the long-term password is needed. It has no
 * challenge and the response is simply the password string.
 *
 * @version New in 1.11
 */
#define KRB5_RESPONDER_QUESTION_PASSWORD "password"

/**
 * OTP responder question
 *
 * The OTP responder question is asked when the KDC indicates that an OTP
 * value is required in order to complete the authentication.  The JSON format
 * of the challenge is:
 *
 *  @n {
 *  @n   "service": <string (optional)>,
 *  @n   "tokenInfo": [
 *  @n      {
 *  @n        "flags":     <number>,
 *  @n        "vendor":    <string (optional)>,
 *  @n        "challenge": <string (optional)>,
 *  @n        "length":    <number (optional)>,
 *  @n        "format":    <number (optional)>,
 *  @n        "tokenID":   <string (optional)>,
 *  @n        "algID":     <string (optional)>,
 *  @n      },
 *  @n      ...
 *  @n    ]
 *  @n  }
 *
 * The answer to the question MUST be JSON formatted:
 *
 * @n  {
 * @n    "tokeninfo": <number>,
 * @n    "value":     <string (optional)>,
 * @n    "pin":       <string (optional)>,
 * @n  }
 *
 * For more detail, please see RFC 6560.
 *
 * @version New in 1.11
 */
#define KRB5_RESPONDER_QUESTION_OTP "otp"

/**
 * These format constants identify the format of the token value.
 */
#define KRB5_RESPONDER_OTP_FORMAT_DECIMAL 0
#define KRB5_RESPONDER_OTP_FORMAT_HEXADECIMAL 1
#define KRB5_RESPONDER_OTP_FORMAT_ALPHANUMERIC 2

/**
 * This flag indicates that the token value MUST be collected.
 */
#define KRB5_RESPONDER_OTP_FLAGS_COLLECT_TOKEN 0x0001

/**
 * This flag indicates that the PIN value MUST be collected.
 */
#define KRB5_RESPONDER_OTP_FLAGS_COLLECT_PIN   0x0002

/**
 * This flag indicates that the token is now in re-synchronization mode with
 * the server.  The user is expected to reply with the next code displayed on
 * the token.
 */
#define KRB5_RESPONDER_OTP_FLAGS_NEXTOTP       0x0004

/**
 * This flag indicates that the PIN MUST be returned as a separate item. This
 * flag only takes effect if KRB5_RESPONDER_OTP_FLAGS_COLLECT_PIN is set. If
 * this flag is not set, the responder may either concatenate PIN + token value
 * and store it as "value" in the answer or it may return them separately. If
 * they are returned separately, they will be concatenated internally.
 */
#define KRB5_RESPONDER_OTP_FLAGS_SEPARATE_PIN  0x0008

/**
 * PKINIT responder question
 *
 * The PKINIT responder question is asked when the client needs a password
 * that's being used to protect key information, and is formatted as a JSON
 * object.  A specific identity's flags value, if not zero, is the bitwise-OR
 * of one or more of the KRB5_RESPONDER_PKINIT_FLAGS_TOKEN_* flags defined
 * below, and possibly other flags to be added later.  Any resemblance to
 * similarly-named CKF_* values in the PKCS#11 API should not be depended on.
 *
 *  @n {
 *  @n     identity <string> : flags <number>,
 *  @n     ...
 *  @n }
 *
 * The answer to the question MUST be JSON formatted:
 *
 *  @n {
 *  @n     identity <string> : password <string>,
 *  @n     ...
 *  @n }
 *
 * @version New in 1.12
 */
#define KRB5_RESPONDER_QUESTION_PKINIT "pkinit"

/**
 * This flag indicates that an incorrect PIN was supplied at least once since
 * the last time the correct PIN was supplied.
 */
#define KRB5_RESPONDER_PKINIT_FLAGS_TOKEN_USER_PIN_COUNT_LOW       (1 << 0)

/**
 * This flag indicates that supplying an incorrect PIN will cause the token to
 * lock itself.
 */
#define KRB5_RESPONDER_PKINIT_FLAGS_TOKEN_USER_PIN_FINAL_TRY       (1 << 1)

/**
 * This flag indicates that the user PIN is locked, and you can't log in to the
 * token with it.
 */
#define KRB5_RESPONDER_PKINIT_FLAGS_TOKEN_USER_PIN_LOCKED          (1 << 2)

/**
 * A container for a set of preauthentication questions and answers
 *
 * A responder context is supplied by the krb5 authentication system to a @ref
 * krb5_responder_fn callback.  It contains a list of questions and can receive
 * answers.  Questions contained in a responder context can be listed using
 * krb5_responder_list_questions(), retrieved using
 * krb5_responder_get_challenge(), or answered using
 * krb5_responder_set_answer().  The form of a question's challenge and
 * answer depend on the question name.
 *
 * @version New in 1.11
 */
typedef struct krb5_responder_context_st *krb5_responder_context;

/**
 * List the question names contained in the responder context.
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 *
 * Return a pointer to a null-terminated list of question names which are
 * present in @a rctx.  The pointer is an alias, valid only as long as the
 * lifetime of @a rctx, and should not be modified or freed by the caller.  A
 * question's challenge can be retrieved using krb5_responder_get_challenge()
 * and answered using krb5_responder_set_answer().
 *
 * @version New in 1.11
 */
const char * const * KRB5_CALLCONV
krb5_responder_list_questions(krb5_context ctx, krb5_responder_context rctx);

/**
 * Retrieve the challenge data for a given question in the responder context.
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 * @param [in] question         Question name
 *
 * Return a pointer to a C string containing the challenge for @a question
 * within @a rctx, or NULL if the question is not present in @a rctx.  The
 * structure of the question depends on the question name, but will always be
 * printable UTF-8 text.  The returned pointer is an alias, valid only as long
 * as the lifetime of @a rctx, and should not be modified or freed by the
 * caller.
 *
 * @version New in 1.11
 */
const char * KRB5_CALLCONV
krb5_responder_get_challenge(krb5_context ctx, krb5_responder_context rctx,
                             const char *question);

/**
 * Answer a named question in the responder context.
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 * @param [in] question         Question name
 * @param [in] answer           The string to set (MUST be printable UTF-8)
 *
 * This function supplies an answer to @a question within @a rctx.  The
 * appropriate form of the answer depends on the question name.
 *
 * @retval EINVAL @a question is not present within @a rctx
 *
 * @version New in 1.11
 */
krb5_error_code KRB5_CALLCONV
krb5_responder_set_answer(krb5_context ctx, krb5_responder_context rctx,
                          const char *question, const char *answer);

/**
 * Responder function for an initial credential exchange.
 *
 * @param [in] ctx              Library context
 * @param [in] data             Callback data
 * @param [in] rctx             Responder context
 *
 * A responder function is like a prompter function, but is used for handling
 * questions and answers as potentially complex data types.  Client
 * preauthentication modules will insert a set of named "questions" into
 * the responder context.  Each question may optionally contain a challenge.
 * This challenge is printable UTF-8, but may be an encoded value.  The
 * precise encoding and contents of the challenge are specific to the question
 * asked.  When the responder is called, it should answer all the questions it
 * understands.  Like the challenge, the answer MUST be printable UTF-8, but
 * may contain structured/encoded data formatted to the expected answer format
 * of the question.
 *
 * If a required question is unanswered, the prompter may be called.
 */
typedef krb5_error_code
(KRB5_CALLCONV *krb5_responder_fn)(krb5_context ctx, void *data,
                                   krb5_responder_context rctx);

typedef struct _krb5_responder_otp_tokeninfo {
    krb5_flags flags;
    krb5_int32 format; /* -1 when not specified. */
    krb5_int32 length; /* -1 when not specified. */
    char *vendor;
    char *challenge;
    char *token_id;
    char *alg_id;
} krb5_responder_otp_tokeninfo;

typedef struct _krb5_responder_otp_challenge {
    char *service;
    krb5_responder_otp_tokeninfo **tokeninfo;
} krb5_responder_otp_challenge;

/**
 * Decode the KRB5_RESPONDER_QUESTION_OTP to a C struct.
 *
 * A convenience function which parses the KRB5_RESPONDER_QUESTION_OTP
 * question challenge data, making it available in native C.  The main feature
 * of this function is the ability to interact with OTP tokens without parsing
 * the JSON.
 *
 * The returned value must be passed to krb5_responder_otp_challenge_free() to
 * be freed.
 *
 * @param [in]  ctx             Library context
 * @param [in]  rctx            Responder context
 * @param [out] chl             Challenge structure
 *
 * @version New in 1.11
 */
krb5_error_code KRB5_CALLCONV
krb5_responder_otp_get_challenge(krb5_context ctx,
                                 krb5_responder_context rctx,
                                 krb5_responder_otp_challenge **chl);

/**
 * Answer the KRB5_RESPONDER_QUESTION_OTP question.
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 * @param [in] ti               The index of the tokeninfo selected
 * @param [in] value            The value to set, or NULL for none
 * @param [in] pin              The pin to set, or NULL for none
 *
 * @version New in 1.11
 */
krb5_error_code KRB5_CALLCONV
krb5_responder_otp_set_answer(krb5_context ctx, krb5_responder_context rctx,
                              size_t ti, const char *value, const char *pin);

/**
 * Free the value returned by krb5_responder_otp_get_challenge().
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 * @param [in] chl              The challenge to free
 *
 * @version New in 1.11
 */
void KRB5_CALLCONV
krb5_responder_otp_challenge_free(krb5_context ctx,
                                  krb5_responder_context rctx,
                                  krb5_responder_otp_challenge *chl);

typedef struct _krb5_responder_pkinit_identity {
    char *identity;
    krb5_int32 token_flags;     /* 0 when not specified or not applicable. */
} krb5_responder_pkinit_identity;

typedef struct _krb5_responder_pkinit_challenge {
    krb5_responder_pkinit_identity **identities;
} krb5_responder_pkinit_challenge;

/**
 * Decode the KRB5_RESPONDER_QUESTION_PKINIT to a C struct.
 *
 * A convenience function which parses the KRB5_RESPONDER_QUESTION_PKINIT
 * question challenge data, making it available in native C.  The main feature
 * of this function is the ability to read the challenge without parsing
 * the JSON.
 *
 * The returned value must be passed to krb5_responder_pkinit_challenge_free()
 * to be freed.
 *
 * @param [in]  ctx             Library context
 * @param [in]  rctx            Responder context
 * @param [out] chl_out         Challenge structure
 *
 * @version New in 1.12
 */
krb5_error_code KRB5_CALLCONV
krb5_responder_pkinit_get_challenge(krb5_context ctx,
                                    krb5_responder_context rctx,
                                    krb5_responder_pkinit_challenge **chl_out);

/**
 * Answer the KRB5_RESPONDER_QUESTION_PKINIT question for one identity.
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 * @param [in] identity         The identity for which a PIN is being supplied
 * @param [in] pin              The provided PIN, or NULL for none
 *
 * @version New in 1.12
 */
krb5_error_code KRB5_CALLCONV
krb5_responder_pkinit_set_answer(krb5_context ctx, krb5_responder_context rctx,
                                 const char *identity, const char *pin);

/**
 * Free the value returned by krb5_responder_pkinit_get_challenge().
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 * @param [in] chl              The challenge to free
 *
 * @version New in 1.12
 */
void KRB5_CALLCONV
krb5_responder_pkinit_challenge_free(krb5_context ctx,
                                     krb5_responder_context rctx,
                                     krb5_responder_pkinit_challenge *chl);

/** Store options for @c _krb5_get_init_creds */
typedef struct _krb5_get_init_creds_opt {
    krb5_flags flags;
    krb5_deltat tkt_life;
    krb5_deltat renew_life;
    int forwardable;
    int proxiable;
    krb5_enctype *etype_list;
    int etype_list_length;
    krb5_address **address_list;
    krb5_preauthtype *preauth_list;
    int preauth_list_length;
    krb5_data *salt;
} krb5_get_init_creds_opt;

#define KRB5_GET_INIT_CREDS_OPT_TKT_LIFE        0x0001
#define KRB5_GET_INIT_CREDS_OPT_RENEW_LIFE      0x0002
#define KRB5_GET_INIT_CREDS_OPT_FORWARDABLE     0x0004
#define KRB5_GET_INIT_CREDS_OPT_PROXIABLE       0x0008
#define KRB5_GET_INIT_CREDS_OPT_ETYPE_LIST      0x0010
#define KRB5_GET_INIT_CREDS_OPT_ADDRESS_LIST    0x0020
#define KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST    0x0040
#define KRB5_GET_INIT_CREDS_OPT_SALT            0x0080
#define KRB5_GET_INIT_CREDS_OPT_CHG_PWD_PRMPT   0x0100
#define KRB5_GET_INIT_CREDS_OPT_CANONICALIZE    0x0200
#define KRB5_GET_INIT_CREDS_OPT_ANONYMOUS       0x0400


/**
 * Allocate a new initial credential options structure.
 *
 * @param [in]  context         Library context
 * @param [out] opt             New options structure
 *
 * This function is the preferred way to create an options structure for
 * getting initial credentials, and is required to make use of certain options.
 * Use krb5_get_init_creds_opt_free() to free @a opt when it is no longer
 * needed.
 *
 * @retval 0 - Success; Kerberos errors otherwise.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_alloc(krb5_context context,
                              krb5_get_init_creds_opt **opt);

/**
 * Free initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options structure to free
 *
 * @sa krb5_get_init_creds_opt_alloc()
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_free(krb5_context context,
                             krb5_get_init_creds_opt *opt);

/** @deprecated Use krb5_get_init_creds_opt_alloc() instead. */
void KRB5_CALLCONV
krb5_get_init_creds_opt_init(krb5_get_init_creds_opt *opt);

/**
 * Set the ticket lifetime in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] tkt_life         Ticket lifetime
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_tkt_life(krb5_get_init_creds_opt *opt,
                                     krb5_deltat tkt_life);

/**
 * Set the ticket renewal lifetime in initial credential options.
 *
 * @param [in] opt              Pointer to @a options field
 * @param [in] renew_life       Ticket renewal lifetime
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_renew_life(krb5_get_init_creds_opt *opt,
                                       krb5_deltat renew_life);

/**
 * Set or unset the forwardable flag in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] forwardable      Whether credentials should be forwardable
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_forwardable(krb5_get_init_creds_opt *opt,
                                        int forwardable);

/**
 * Set or unset the proxiable flag in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] proxiable        Whether credentials should be proxiable
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_proxiable(krb5_get_init_creds_opt *opt,
                                      int proxiable);

/**
 * Set or unset the canonicalize flag in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] canonicalize     Whether to canonicalize client principal
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_canonicalize(krb5_get_init_creds_opt *opt,
                                         int canonicalize);

/**
 * Set or unset the anonymous flag in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] anonymous        Whether to make an anonymous request
 *
 * This function may be used to request anonymous credentials from the KDC by
 * setting @a anonymous to non-zero.  Note that anonymous credentials are only
 * a request; clients must verify that credentials are anonymous if that is a
 * requirement.
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_anonymous(krb5_get_init_creds_opt *opt,
                                      int anonymous);

/**
 * Set allowable encryption types in initial credential options.
 *
 * @param [in] opt               Options structure
 * @param [in] etype_list        Array of encryption types
 * @param [in] etype_list_length Length of @a etype_list
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_etype_list(krb5_get_init_creds_opt *opt,
                                       krb5_enctype *etype_list,
                                       int etype_list_length);

/**
 * Set address restrictions in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] addresses        Null-terminated array of addresses
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_address_list(krb5_get_init_creds_opt *opt,
                                         krb5_address **addresses);

/**
 * Set preauthentication types in initial credential options.
 *
 * @param [in] opt                 Options structure
 * @param [in] preauth_list        Array of preauthentication types
 * @param [in] preauth_list_length Length of @a preauth_list
 *
 * This function can be used to perform optimistic preauthentication when
 * getting initial credentials, in combination with
 * krb5_get_init_creds_opt_set_salt() and krb5_get_init_creds_opt_set_pa().
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_preauth_list(krb5_get_init_creds_opt *opt,
                                         krb5_preauthtype *preauth_list,
                                         int preauth_list_length);

/**
 * Set salt for optimistic preauthentication in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] salt             Salt data
 *
 * When getting initial credentials with a password, a salt string it used to
 * convert the password to a key.  Normally this salt is obtained from the
 * first KDC reply, but when performing optimistic preauthentication, the
 * client may need to supply the salt string with this function.
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_salt(krb5_get_init_creds_opt *opt,
                                 krb5_data *salt);

/**
 * Set or unset change-password-prompt flag in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] prompt           Whether to prompt to change password
 *
 * This flag is on by default.  It controls whether
 * krb5_get_init_creds_password() will react to an expired-password error by
 * prompting for a new password and attempting to change the old one.
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_change_password_prompt(krb5_get_init_creds_opt *opt,
                                                   int prompt);

/** Generic preauth option attribute/value pairs */
typedef struct _krb5_gic_opt_pa_data {
    char *attr;
    char *value;
} krb5_gic_opt_pa_data;

/**
 * Supply options for preauthentication in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options structure
 * @param [in] attr             Preauthentication option name
 * @param [in] value            Preauthentication option value
 *
 * This function allows the caller to supply options for preauthentication.
 * The values of @a attr and @a value are supplied to each preauthentication
 * module available within @a context.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_pa(krb5_context context,
                               krb5_get_init_creds_opt *opt, const char *attr,
                               const char *value);

/**
 * Set location of FAST armor ccache in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options
 * @param [in] fast_ccache_name Credential cache name
 *
 * Sets the location of a credential cache containing an armor ticket to
 * protect an initial credential exchange using the FAST protocol extension.
 *
 * In version 1.7, setting an armor ccache requires that FAST be used for the
 * exchange.  In version 1.8 or later, setting the armor ccache causes FAST to
 * be used if the KDC supports it; krb5_get_init_creds_opt_set_fast_flags()
 * must be used to require that FAST be used.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_fast_ccache_name(krb5_context context,
                                             krb5_get_init_creds_opt *opt,
                                             const char *fast_ccache_name);

/**
 * Set FAST armor cache in initial credential options.
 *
 * @param [in] context           Library context
 * @param [in] opt               Options
 * @param [in] ccache            Credential cache handle
 *
 * This function is similar to krb5_get_init_creds_opt_set_fast_ccache_name(),
 * but uses a credential cache handle instead of a name.
 *
 * @version New in 1.9
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_fast_ccache(krb5_context context,
                                        krb5_get_init_creds_opt *opt,
                                        krb5_ccache ccache);

/**
 * Set an input credential cache in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options
 * @param [in] ccache           Credential cache handle
 *
 * If an input credential cache is set, then the krb5_get_init_creds family of
 * APIs will read settings from it.  Setting an input ccache is desirable when
 * the application wishes to perform authentication in the same way (using the
 * same preauthentication mechanisms, and making the same non-security-
 * sensitive choices) as the previous authentication attempt, which stored
 * information in the passed-in ccache.
 *
 * @version New in 1.11
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_in_ccache(krb5_context context,
                                      krb5_get_init_creds_opt *opt,
                                      krb5_ccache ccache);

/**
 * Set an output credential cache in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options
 * @param [in] ccache           Credential cache handle
 *
 * If an output credential cache is set, then the krb5_get_init_creds family of
 * APIs will write credentials to it.  Setting an output ccache is desirable
 * both because it simplifies calling code and because it permits the
 * krb5_get_init_creds APIs to write out configuration information about the
 * realm to the ccache.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_out_ccache(krb5_context context,
                                       krb5_get_init_creds_opt *opt,
                                       krb5_ccache ccache);

/**
 * @brief Ask the KDC to include or not include a PAC in the ticket
 *
 * @param [in] context          Library context
 * @param [in] opt              Options structure
 * @param [in] req_pac          Whether to request a PAC or not
 *
 * If this option is set, the AS request will include a PAC-REQUEST pa-data
 * item explicitly asking the KDC to either include or not include a privilege
 * attribute certificate in the ticket authorization data.  By default, no
 * request is made; typically the KDC will default to including a PAC if it
 * supports them.
 *
 * @version New in 1.15
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_pac_request(krb5_context context,
                                        krb5_get_init_creds_opt *opt,
                                        krb5_boolean req_pac);

/**
 * Set FAST flags in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options
 * @param [in] flags            FAST flags
 *
 * The following flag values are valid:
 * @li #KRB5_FAST_REQUIRED - Require FAST to be used
 *
 * @retval
 * 0 - Success; Kerberos errors otherwise.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_fast_flags(krb5_context context,
                                       krb5_get_init_creds_opt *opt,
                                       krb5_flags flags);

/**
 * Retrieve FAST flags from initial credential options.
 *
 * @param [in]  context         Library context
 * @param [in]  opt             Options
 * @param [out] out_flags       FAST flags
 *
 * @retval
 * 0 - Success; Kerberos errors otherwise.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_get_fast_flags(krb5_context context,
                                       krb5_get_init_creds_opt *opt,
                                       krb5_flags *out_flags);

/* Fast flags*/
#define KRB5_FAST_REQUIRED 0x0001 /**< Require KDC to support FAST*/

typedef void
(KRB5_CALLCONV *krb5_expire_callback_func)(krb5_context context, void *data,
                                           krb5_timestamp password_expiration,
                                           krb5_timestamp account_expiration,
                                           krb5_boolean is_last_req);

/**
 * Set an expiration callback in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options structure
 * @param [in] cb               Callback function
 * @param [in] data             Callback argument
 *
 * Set a callback to receive password and account expiration times.
 *
 * This option only applies to krb5_get_init_creds_password().  @a cb will be
 * invoked if and only if credentials are successfully acquired.  The callback
 * will receive the @a context from the krb5_get_init_creds_password() call and
 * the @a data argument supplied with this API.  The remaining arguments should
 * be interpreted as follows:
 *
 * If @a is_last_req is true, then the KDC reply contained last-req entries
 * which unambiguously indicated the password expiration, account expiration,
 * or both.  (If either value was not present, the corresponding argument will
 * be 0.)  Furthermore, a non-zero @a password_expiration should be taken as a
 * suggestion from the KDC that a warning be displayed.
 *
 * If @a is_last_req is false, then @a account_expiration will be 0 and @a
 * password_expiration will contain the expiration time of either the password
 * or account, or 0 if no expiration time was indicated in the KDC reply.  The
 * callback should independently decide whether to display a password
 * expiration warning.
 *
 * Note that @a cb may be invoked even if credentials are being acquired for
 * the kadmin/changepw service in order to change the password.  It is the
 * caller's responsibility to avoid displaying a password expiry warning in
 * this case.
 *
 * @warning Setting an expire callback with this API will cause
 * krb5_get_init_creds_password() not to send password expiry warnings to the
 * prompter, as it ordinarily may.
 *
 * @version New in 1.9
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_expire_callback(krb5_context context,
                                            krb5_get_init_creds_opt *opt,
                                            krb5_expire_callback_func cb,
                                            void *data);

/**
 * Set the responder function in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options structure
 * @param [in] responder        Responder function
 * @param [in] data             Responder data argument
 *
 * @version New in 1.11
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_responder(krb5_context context,
                                      krb5_get_init_creds_opt *opt,
                                      krb5_responder_fn responder, void *data);

/**
 * Get initial credentials using a password.
 *
 * @param [in]  context         Library context
 * @param [out] creds           New credentials
 * @param [in]  client          Client principal
 * @param [in]  password        Password (or NULL)
 * @param [in]  prompter        Prompter function
 * @param [in]  data            Prompter callback data
 * @param [in]  start_time      Time when ticket becomes valid (0 for now)
 * @param [in]  in_tkt_service  Service name of initial credentials (or NULL)
 * @param [in]  k5_gic_options  Initial credential options
 *
 * This function requests KDC for an initial credentials for @a client using @a
 * password.  If @a password is NULL, a password will be prompted for using @a
 * prompter if necessary.  If @a in_tkt_service is specified, it is parsed as a
 * principal name (with the realm ignored) and used as the service principal
 * for the request; otherwise the ticket-granting service is used.
 *
 * @sa krb5_verify_init_creds()
 *
 * @retval
 *  0    Success
 * @retval
 *  EINVAL Invalid argument
 * @retval
 *  KRB5_KDC_UNREACH Cannot contact any KDC for requested realm
 * @retval
 *  KRB5_PREAUTH_FAILED Generic Pre-athentication failure
 * @retval
 *  KRB5_LIBOS_PWDINTR Password read interrupted
 * @retval
 *  KRB5_REALM_CANT_RESOLVE Cannot resolve network address for KDC in requested realm
 * @retval
 *  KRB5KDC_ERR_KEY_EXP Password has expired
 * @retval
 *  KRB5_LIBOS_BADPWDMATCH Password mismatch
 * @retval
 *  KRB5_CHPW_PWDNULL New password cannot be zero length
 * @retval
 *  KRB5_CHPW_FAIL Password change failed
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_password(krb5_context context, krb5_creds *creds,
                             krb5_principal client, const char *password,
                             krb5_prompter_fct prompter, void *data,
                             krb5_deltat start_time,
                             const char *in_tkt_service,
                             krb5_get_init_creds_opt *k5_gic_options);

/**
 * Retrieve enctype, salt and s2kparams from KDC
 *
 * @param [in]  context         Library context
 * @param [in]  principal       Principal whose information is requested
 * @param [in]  opt             Initial credential options
 * @param [out] enctype_out     The enctype chosen by KDC
 * @param [out] salt_out        Salt returned from KDC
 * @param [out] s2kparams_out   String-to-key parameters returned from KDC
 *
 * Send an initial ticket request for @a principal and extract the encryption
 * type, salt type, and string-to-key parameters from the KDC response.  If the
 * KDC provides no etype-info, set @a enctype_out to @c ENCTYPE_NULL and set @a
 * salt_out and @a s2kparams_out to empty.  If the KDC etype-info provides no
 * salt, compute the default salt and place it in @a salt_out.  If the KDC
 * etype-info provides no string-to-key parameters, set @a s2kparams_out to
 * empty.
 *
 * @a opt may be used to specify options which affect the initial request, such
 * as request encryption types or a FAST armor cache (see
 * krb5_get_init_creds_opt_set_etype_list() and
 * krb5_get_init_creds_opt_set_fast_ccache_name()).
 *
 * Use krb5_free_data_contents() to free @a salt_out and @a s2kparams_out when
 * they are no longer needed.
 *
 * @version New in 1.17
 *
 * @retval 0 Success
 * @return A Kerberos error code
 */
krb5_error_code KRB5_CALLCONV
krb5_get_etype_info(krb5_context context, krb5_principal principal,
                    krb5_get_init_creds_opt *opt, krb5_enctype *enctype_out,
                    krb5_data *salt_out, krb5_data *s2kparams_out);

struct _krb5_init_creds_context;
typedef struct _krb5_init_creds_context *krb5_init_creds_context;

#define KRB5_INIT_CREDS_STEP_FLAG_CONTINUE 0x1  /**< More responses needed */

/**
 * Free an initial credentials context.
 *
 * @param [in] context          Library context
 * @param [in] ctx              Initial credentials context
 *
 * @a context must be the same as the one passed to krb5_init_creds_init() for
 * this initial credentials context.
 */
void KRB5_CALLCONV
krb5_init_creds_free(krb5_context context, krb5_init_creds_context ctx);

/**
 * Acquire credentials using an initial credentials context.
 *
 * @param [in] context          Library context
 * @param [in] ctx              Initial credentials context
 *
 * This function synchronously obtains credentials using a context created by
 * krb5_init_creds_init().  On successful return, the credentials can be
 * retrieved with krb5_init_creds_get_creds().
 *
 * @a context must be the same as the one passed to krb5_init_creds_init() for
 * this initial credentials context.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_get(krb5_context context, krb5_init_creds_context ctx);

/**
 * Retrieve acquired credentials from an initial credentials context.
 *
 * @param [in]  context         Library context
 * @param [in]  ctx             Initial credentials context
 * @param [out] creds           Acquired credentials
 *
 * This function copies the acquired initial credentials from @a ctx into @a
 * creds, after the successful completion of krb5_init_creds_get() or
 * krb5_init_creds_step().  Use krb5_free_cred_contents() to free @a creds when
 * it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_get_creds(krb5_context context, krb5_init_creds_context ctx,
                          krb5_creds *creds);

/**
 * Get the last error from KDC from an initial credentials context.
 *
 * @param [in]  context         Library context
 * @param [in]  ctx             Initial credentials context
 * @param [out] error           Error from KDC, or NULL if none was received
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_get_error(krb5_context context, krb5_init_creds_context ctx,
                          krb5_error **error);

/**
 * Create a context for acquiring initial credentials.
 *
 * @param [in]  context         Library context
 * @param [in]  client          Client principal to get initial creds for
 * @param [in]  prompter        Prompter callback
 * @param [in]  data            Prompter callback argument
 * @param [in]  start_time      Time when credentials become valid (0 for now)
 * @param [in]  options         Options structure (NULL for default)
 * @param [out] ctx             New initial credentials context
 *
 * This function creates a new context for acquiring initial credentials.  Use
 * krb5_init_creds_free() to free @a ctx when it is no longer needed.
 *
 * Any subsequent calls to krb5_init_creds_step(), krb5_init_creds_get(), or
 * krb5_init_creds_free() for this initial credentials context must use the
 * same @a context argument as the one passed to this function.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_init(krb5_context context, krb5_principal client,
                     krb5_prompter_fct prompter, void *data,
                     krb5_deltat start_time, krb5_get_init_creds_opt *options,
                     krb5_init_creds_context *ctx);

/**
 * Specify a keytab to use for acquiring initial credentials.
 *
 * @param [in] context          Library context
 * @param [in] ctx              Initial credentials context
 * @param [in] keytab           Key table handle
 *
 * This function supplies a keytab containing the client key for an initial
 * credentials request.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_set_keytab(krb5_context context, krb5_init_creds_context ctx,
                           krb5_keytab keytab);

/**
 * Get the next KDC request for acquiring initial credentials.
 *
 * @param [in]  context         Library context
 * @param [in]  ctx             Initial credentials context
 * @param [in]  in              KDC response (empty on the first call)
 * @param [out] out             Next KDC request
 * @param [out] realm           Realm for next KDC request
 * @param [out] flags           Output flags
 *
 * This function constructs the next KDC request in an initial credential
 * exchange, allowing the caller to control the transport of KDC requests and
 * replies.  On the first call, @a in should be set to an empty buffer; on
 * subsequent calls, it should be set to the KDC's reply to the previous
 * request.
 *
 * If more requests are needed, @a flags will be set to
 * #KRB5_INIT_CREDS_STEP_FLAG_CONTINUE and the next request will be placed in
 * @a out.  If no more requests are needed, @a flags will not contain
 * #KRB5_INIT_CREDS_STEP_FLAG_CONTINUE and @a out will be empty.
 *
 * If this function returns @c KRB5KRB_ERR_RESPONSE_TOO_BIG, the caller should
 * transmit the next request using TCP rather than UDP.  If this function
 * returns any other error, the initial credential exchange has failed.
 *
 * @a context must be the same as the one passed to krb5_init_creds_init() for
 * this initial credentials context.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_step(krb5_context context, krb5_init_creds_context ctx,
                     krb5_data *in, krb5_data *out, krb5_data *realm,
                     unsigned int *flags);

/**
 * Set a password for acquiring initial credentials.
 *
 * @param [in] context          Library context
 * @param [in] ctx              Initial credentials context
 * @param [in] password         Password
 *
 * This function supplies a password to be used to construct the client key for
 * an initial credentials request.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_set_password(krb5_context context, krb5_init_creds_context ctx,
                             const char *password);

/**
 * Specify a service principal for acquiring initial credentials.
 *
 * @param [in] context          Library context
 * @param [in] ctx              Initial credentials context
 * @param [in] service          Service principal string
 *
 * This function supplies a service principal string to acquire initial
 * credentials for instead of the default krbtgt service.  @a service is parsed
 * as a principal name; any realm part is ignored.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_set_service(krb5_context context, krb5_init_creds_context ctx,
                            const char *service);

/**
 * Retrieve ticket times from an initial credentials context.
 *
 * @param [in]  context         Library context
 * @param [in]  ctx             Initial credentials context
 * @param [out] times           Ticket times for acquired credentials
 *
 * The initial credentials context must have completed obtaining credentials
 * via either krb5_init_creds_get() or krb5_init_creds_step().
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_get_times(krb5_context context, krb5_init_creds_context ctx,
                          krb5_ticket_times *times);

struct _krb5_tkt_creds_context;
typedef struct _krb5_tkt_creds_context *krb5_tkt_creds_context;

/**
 * Create a context to get credentials from a KDC's Ticket Granting Service.
 *
 * @param[in]  context          Library context
 * @param[in]  ccache           Credential cache handle
 * @param[in]  creds            Input credentials
 * @param[in]  options          @ref KRB5_GC options for this request.
 * @param[out] ctx              New TGS request context
 *
 * This function prepares to obtain credentials matching @a creds, either by
 * retrieving them from @a ccache or by making requests to ticket-granting
 * services beginning with a ticket-granting ticket for the client principal's
 * realm.
 *
 * The resulting TGS acquisition context can be used asynchronously with
 * krb5_tkt_creds_step() or synchronously with krb5_tkt_creds_get().  See also
 * krb5_get_credentials() for synchronous use.
 *
 * Use krb5_tkt_creds_free() to free @a ctx when it is no longer needed.
 *
 * @version New in 1.9
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_tkt_creds_init(krb5_context context, krb5_ccache ccache,
                    krb5_creds *creds, krb5_flags options,
                    krb5_tkt_creds_context *ctx);

/**
 * Synchronously obtain credentials using a TGS request context.
 *
 * @param[in] context           Library context
 * @param[in] ctx               TGS request context
 *
 * This function synchronously obtains credentials using a context created by
 * krb5_tkt_creds_init().  On successful return, the credentials can be
 * retrieved with krb5_tkt_creds_get_creds().
 *
 * @version New in 1.9
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_tkt_creds_get(krb5_context context, krb5_tkt_creds_context ctx);

/**
 * Retrieve acquired credentials from a TGS request context.
 *
 * @param[in]  context          Library context
 * @param[in]  ctx              TGS request context
 * @param[out] creds            Acquired credentials
 *
 * This function copies the acquired initial credentials from @a ctx into @a
 * creds, after the successful completion of krb5_tkt_creds_get() or
 * krb5_tkt_creds_step().  Use krb5_free_cred_contents() to free @a creds when
 * it is no longer needed.
 *
 * @version New in 1.9
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_tkt_creds_get_creds(krb5_context context, krb5_tkt_creds_context ctx,
                         krb5_creds *creds);

/**
 * Free a TGS request context.
 *
 * @param[in]  context  Library context
 * @param[in]  ctx      TGS request context
 *
 * @version New in 1.9
 */
void KRB5_CALLCONV
krb5_tkt_creds_free(krb5_context context, krb5_tkt_creds_context ctx);

#define KRB5_TKT_CREDS_STEP_FLAG_CONTINUE 0x1  /**< More responses needed */

/**
 * Get the next KDC request in a TGS exchange.
 *
 * @param[in]  context          Library context
 * @param[in]  ctx              TGS request context
 * @param[in]  in               KDC response (empty on the first call)
 * @param[out] out              Next KDC request
 * @param[out] realm            Realm for next KDC request
 * @param[out] flags            Output flags
 *
 * This function constructs the next KDC request for a TGS exchange, allowing
 * the caller to control the transport of KDC requests and replies.  On the
 * first call, @a in should be set to an empty buffer; on subsequent calls, it
 * should be set to the KDC's reply to the previous request.
 *
 * If more requests are needed, @a flags will be set to
 * #KRB5_TKT_CREDS_STEP_FLAG_CONTINUE and the next request will be placed in @a
 * out.  If no more requests are needed, @a flags will not contain
 * #KRB5_TKT_CREDS_STEP_FLAG_CONTINUE and @a out will be empty.
 *
 * If this function returns @c KRB5KRB_ERR_RESPONSE_TOO_BIG, the caller should
 * transmit the next request using TCP rather than UDP.  If this function
 * returns any other error, the TGS exchange has failed.
 *
 * @version New in 1.9
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_tkt_creds_step(krb5_context context, krb5_tkt_creds_context ctx,
                    krb5_data *in, krb5_data *out, krb5_data *realm,
                    unsigned int *flags);

/**
 * Retrieve ticket times from a TGS request context.
 *
 * @param[in]  context          Library context
 * @param[in]  ctx              TGS request context
 * @param[out] times            Ticket times for acquired credentials
 *
 * The TGS request context must have completed obtaining credentials via either
 * krb5_tkt_creds_get() or krb5_tkt_creds_step().
 *
 * @version New in 1.9
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_tkt_creds_get_times(krb5_context context, krb5_tkt_creds_context ctx,
                         krb5_ticket_times *times);

/**
 * Get initial credentials using a key table.
 *
 * @param [in]  context         Library context
 * @param [out] creds           New credentials
 * @param [in]  client          Client principal
 * @param [in]  arg_keytab      Key table handle
 * @param [in]  start_time      Time when ticket becomes valid (0 for now)
 * @param [in]  in_tkt_service  Service name of initial credentials (or NULL)
 * @param [in]  k5_gic_options  Initial credential options
 *
 * This function requests KDC for an initial credentials for @a client using a
 * client key stored in @a arg_keytab.  If @a in_tkt_service is specified, it
 * is parsed as a principal name (with the realm ignored) and used as the
 * service principal for the request; otherwise the ticket-granting service is
 * used.
 *
 * @sa krb5_verify_init_creds()
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_keytab(krb5_context context, krb5_creds *creds,
                           krb5_principal client, krb5_keytab arg_keytab,
                           krb5_deltat start_time, const char *in_tkt_service,
                           krb5_get_init_creds_opt *k5_gic_options);

typedef struct _krb5_verify_init_creds_opt {
    krb5_flags flags;
    int ap_req_nofail; /**< boolean */
} krb5_verify_init_creds_opt;

#define KRB5_VERIFY_INIT_CREDS_OPT_AP_REQ_NOFAIL        0x0001

/**
 * Initialize a credential verification options structure.
 *
 * @param [in] k5_vic_options   Verification options structure
 */
void KRB5_CALLCONV
krb5_verify_init_creds_opt_init(krb5_verify_init_creds_opt *k5_vic_options);

/**
 * Set whether credential verification is required.
 *
 * @param [in] k5_vic_options   Verification options structure
 * @param [in] ap_req_nofail    Whether to require successful verification
 *
 * This function determines how krb5_verify_init_creds() behaves if no keytab
 * information is available.  If @a ap_req_nofail is @c FALSE, verification
 * will be skipped in this case and krb5_verify_init_creds() will return
 * successfully.  If @a ap_req_nofail is @c TRUE, krb5_verify_init_creds() will
 * not return successfully unless verification can be performed.
 *
 * If this function is not used, the behavior of krb5_verify_init_creds() is
 * determined through configuration.
 */
void KRB5_CALLCONV
krb5_verify_init_creds_opt_set_ap_req_nofail(krb5_verify_init_creds_opt * k5_vic_options,
                                             int ap_req_nofail);

/**
 * Verify initial credentials against a keytab.
 *
 * @param [in] context          Library context
 * @param [in] creds            Initial credentials to be verified
 * @param [in] server           Server principal (or NULL)
 * @param [in] keytab           Key table (NULL to use default keytab)
 * @param [in] ccache           Credential cache for fetched creds (or NULL)
 * @param [in] options          Verification options (NULL for default options)
 *
 * This function attempts to verify that @a creds were obtained from a KDC with
 * knowledge of a key in @a keytab, or the default keytab if @a keytab is NULL.
 * If @a server is provided, the highest-kvno key entry for that principal name
 * is used to verify the credentials; otherwise, all unique "host" service
 * principals in the keytab are tried.
 *
 * If the specified keytab does not exist, or is empty, or cannot be read, or
 * does not contain an entry for @a server, then credential verification may be
 * skipped unless configuration demands that it succeed.  The caller can
 * control this behavior by providing a verification options structure; see
 * krb5_verify_init_creds_opt_init() and
 * krb5_verify_init_creds_opt_set_ap_req_nofail().
 *
 * If @a ccache is NULL, any additional credentials fetched during the
 * verification process will be destroyed.  If @a ccache points to NULL, a
 * memory ccache will be created for the additional credentials and returned in
 * @a ccache.  If @a ccache points to a valid credential cache handle, the
 * additional credentials will be stored in that cache.
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_verify_init_creds(krb5_context context, krb5_creds *creds,
                       krb5_principal server, krb5_keytab keytab,
                       krb5_ccache *ccache,
                       krb5_verify_init_creds_opt *options);

/**
 * Get validated credentials from the KDC.
 *
 * @param [in]  context         Library context
 * @param [out] creds           Validated credentials
 * @param [in]  client          Client principal name
 * @param [in]  ccache          Credential cache
 * @param [in]  in_tkt_service  Server principal string (or NULL)
 *
 * This function gets a validated credential using a postdated credential from
 * @a ccache.  If @a in_tkt_service is specified, it is parsed (with the realm
 * part ignored) and used as the server principal of the credential;
 * otherwise, the ticket-granting service is used.
 *
 * If successful, the validated credential is placed in @a creds.
 *
 * @sa krb5_get_renewed_creds()
 *
 * @retval
 * 0 Success
 * @retval
 * KRB5_NO_2ND_TKT Request missing second ticket
 * @retval
 * KRB5_NO_TKT_SUPPLIED Request did not supply a ticket
 * @retval
 * KRB5_PRINC_NOMATCH Requested principal and ticket do not match
 * @retval
 * KRB5_KDCREP_MODIFIED KDC reply did not match expectations
 * @retval
 * KRB5_KDCREP_SKEW Clock skew too great in KDC reply
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_validated_creds(krb5_context context, krb5_creds *creds,
                         krb5_principal client, krb5_ccache ccache,
                         const char *in_tkt_service);

/**
 * Get renewed credential from KDC using an existing credential.
 *
 * @param [in]  context         Library context
 * @param [out] creds           Renewed credentials
 * @param [in]  client          Client principal name
 * @param [in]  ccache          Credential cache
 * @param [in]  in_tkt_service  Server principal string (or NULL)
 *
 * This function gets a renewed credential using an existing one from @a
 * ccache.  If @a in_tkt_service is specified, it is parsed (with the realm
 * part ignored) and used as the server principal of the credential; otherwise,
 * the ticket-granting service is used.
 *
 * If successful, the renewed credential is placed in @a creds.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_renewed_creds(krb5_context context, krb5_creds *creds,
                       krb5_principal client, krb5_ccache ccache,
                       const char *in_tkt_service);

/**
 * Decode an ASN.1-formatted ticket.
 *
 * @param [in]  code            ASN.1-formatted ticket
 * @param [out] rep             Decoded ticket information
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_decode_ticket(const krb5_data *code, krb5_ticket **rep);

/**
 * Retrieve a string value from the appdefaults section of krb5.conf.
 *
 * @param [in]  context         Library context
 * @param [in]  appname         Application name
 * @param [in]  realm           Realm name
 * @param [in]  option          Option to be checked
 * @param [in]  default_value   Default value to return if no match is found
 * @param [out] ret_value       String value of @a option
 *
 * This function gets the application defaults for @a option based on the given
 * @a appname and/or @a realm.
 *
 * @sa krb5_appdefault_boolean()
 */
void KRB5_CALLCONV
krb5_appdefault_string(krb5_context context, const char *appname,
                       const krb5_data *realm, const char *option,
                       const char *default_value, char ** ret_value);

/**
 * Retrieve a boolean value from the appdefaults section of krb5.conf.
 *
 * @param [in]  context         Library context
 * @param [in]  appname         Application name
 * @param [in]  realm           Realm name
 * @param [in]  option          Option to be checked
 * @param [in]  default_value   Default value to return if no match is found
 * @param [out] ret_value       Boolean value of @a option
 *
 * This function gets the application defaults for @a option based on the given
 * @a appname and/or @a realm.
 *
 * @sa krb5_appdefault_string()
 */
void KRB5_CALLCONV
krb5_appdefault_boolean(krb5_context context, const char *appname,
                        const krb5_data *realm, const char *option,
                        int default_value, int *ret_value);

/*
 * Prompter enhancements
 */
/** Prompt for password */
#define KRB5_PROMPT_TYPE_PASSWORD            0x1
/** Prompt for new password (during password change) */
#define KRB5_PROMPT_TYPE_NEW_PASSWORD        0x2
/** Prompt for new password again */
#define KRB5_PROMPT_TYPE_NEW_PASSWORD_AGAIN  0x3
/** Prompt for preauthentication data (such as an OTP value) */
#define KRB5_PROMPT_TYPE_PREAUTH             0x4

typedef krb5_int32 krb5_prompt_type;

/**
 * Get prompt types array from a context.
 *
 * @param [in] context          Library context
 *
 * @return
 * Pointer to an array of prompt types corresponding to the prompter's @a
 * prompts arguments.  Each type has one of the following values:
 *  @li #KRB5_PROMPT_TYPE_PASSWORD
 *  @li #KRB5_PROMPT_TYPE_NEW_PASSWORD
 *  @li #KRB5_PROMPT_TYPE_NEW_PASSWORD_AGAIN
 *  @li #KRB5_PROMPT_TYPE_PREAUTH
 */
krb5_prompt_type* KRB5_CALLCONV
krb5_get_prompt_types(krb5_context context);

/* Error reporting */
/**
 * Set an extended error message for an error code.
 *
 * @param [in] ctx              Library context
 * @param [in] code             Error code
 * @param [in] fmt              Error string for the error code
 * @param [in] ...              printf(3) style parameters
 */
void KRB5_CALLCONV_C
krb5_set_error_message(krb5_context ctx, krb5_error_code code, const char *fmt, ...)
#if !defined(__cplusplus) && (__GNUC__ > 2)
    __attribute__((__format__(__printf__, 3, 4)))
#endif
    ;

/**
 * Set an extended error message for an error code using a va_list.
 *
 * @param [in] ctx              Library context
 * @param [in] code             Error code
 * @param [in] fmt              Error string for the error code
 * @param [in] args             List of vprintf(3) style arguments
 */
void KRB5_CALLCONV
krb5_vset_error_message(krb5_context  ctx, krb5_error_code code,
                        const char *fmt, va_list args)
#if !defined(__cplusplus) && (__GNUC__ > 2)
    __attribute__((__format__(__printf__, 3, 0)))
#endif
    ;

/**
 * Add a prefix to the message for an error code.
 *
 * @param [in] ctx              Library context
 * @param [in] code             Error code
 * @param [in] fmt              Format string for error message prefix
 * @param [in] ...              printf(3) style parameters
 *
 * Format a message and prepend it to the current message for @a code.  The
 * prefix will be separated from the old message with a colon and space.
 */
void KRB5_CALLCONV_C
krb5_prepend_error_message(krb5_context ctx, krb5_error_code code,
                           const char *fmt, ...)
#if !defined(__cplusplus) && (__GNUC__ > 2)
    __attribute__((__format__(__printf__, 3, 4)))
#endif
    ;

/**
 * Add a prefix to the message for an error code using a va_list.
 *
 * @param [in] ctx              Library context
 * @param [in] code             Error code
 * @param [in] fmt              Format string for error message prefix
 * @param [in] args             List of vprintf(3) style arguments
 *
 * This function is similar to krb5_prepend_error_message(), but uses a
 * va_list instead of variadic arguments.
 */
void KRB5_CALLCONV
krb5_vprepend_error_message(krb5_context  ctx, krb5_error_code code,
                        const char *fmt, va_list args)
#if !defined(__cplusplus) && (__GNUC__ > 2)
    __attribute__((__format__(__printf__, 3, 0)))
#endif
    ;

/**
 * Add a prefix to a different error code's message.
 *
 * @param [in] ctx              Library context
 * @param [in] old_code         Previous error code
 * @param [in] code             Error code
 * @param [in] fmt              Format string for error message prefix
 * @param [in] ...              printf(3) style parameters
 *
 * Format a message and prepend it to the message for @a old_code.  The prefix
 * will be separated from the old message with a colon and space.  Set the
 * resulting message as the extended error message for @a code.
 */
void KRB5_CALLCONV_C
krb5_wrap_error_message(krb5_context ctx, krb5_error_code old_code,
                        krb5_error_code code, const char *fmt, ...)
#if !defined(__cplusplus) && (__GNUC__ > 2)
    __attribute__((__format__(__printf__, 4, 5)))
#endif
    ;

/**
 * Add a prefix to a different error code's message using a va_list.
 *
 * @param [in] ctx              Library context
 * @param [in] old_code         Previous error code
 * @param [in] code             Error code
 * @param [in] fmt              Format string for error message prefix
 * @param [in] args             List of vprintf(3) style arguments
 *
 * This function is similar to krb5_wrap_error_message(), but uses a
 * va_list instead of variadic arguments.
 */
void KRB5_CALLCONV
krb5_vwrap_error_message(krb5_context ctx, krb5_error_code old_code,
                         krb5_error_code code, const char *fmt, va_list args)
#if !defined(__cplusplus) && (__GNUC__ > 2)
    __attribute__((__format__(__printf__, 4, 0)))
#endif
    ;

/**
 * Copy the most recent extended error message from one context to another.
 *
 * @param [in] dest_ctx         Library context to copy message to
 * @param [in] src_ctx          Library context with current message
 */
void KRB5_CALLCONV
krb5_copy_error_message(krb5_context dest_ctx, krb5_context src_ctx);

/**
 * Get the (possibly extended) error message for a code.
 *
 * @param [in] ctx              Library context
 * @param [in] code             Error code
 *
 * The behavior of krb5_get_error_message() is only defined the first time it
 * is called after a failed call to a krb5 function using the same context, and
 * only when the error code passed in is the same as that returned by the krb5
 * function.
 *
 * This function never returns NULL, so its result may be used unconditionally
 * as a C string.
 *
 * The string returned by this function must be freed using
 * krb5_free_error_message()
 *
 * @note Future versions may return the same string for the second
 * and following calls.
 */
const char * KRB5_CALLCONV
krb5_get_error_message(krb5_context ctx, krb5_error_code code);

/**
 * Free an error message generated by krb5_get_error_message().
 *
 * @param [in] ctx              Library context
 * @param [in] msg              Pointer to error message
 */
void KRB5_CALLCONV
krb5_free_error_message(krb5_context ctx, const char *msg);

/**
 * Clear the extended error message in a context.
 *
 * @param [in] ctx              Library context
 *
 * This function unsets the extended error message in a context, to ensure that
 * it is not mistakenly applied to another occurrence of the same error code.
 */
void KRB5_CALLCONV
krb5_clear_error_message(krb5_context ctx);

/**
 * Unwrap authorization data.
 *
 * @param [in]  context         Library context
 * @param [in]  type            @ref KRB5_AUTHDATA type of @a container
 * @param [in]  container       Authorization data to be decoded
 * @param [out] authdata        List of decoded authorization data
 *
 * @sa krb5_encode_authdata_container()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_decode_authdata_container(krb5_context context,
                               krb5_authdatatype type,
                               const krb5_authdata *container,
                               krb5_authdata ***authdata);
/**
 * Wrap authorization data in a container.
 *
 * @param [in]  context         Library context
 * @param [in]  type            @ref KRB5_AUTHDATA type of @a container
 * @param [in]  authdata        List of authorization data to be encoded
 * @param [out] container       List of encoded authorization data
 *
 * The result is returned in @a container as a single-element list.
 *
 * @sa krb5_decode_authdata_container()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_encode_authdata_container(krb5_context context,
                               krb5_authdatatype type,
                               krb5_authdata * const*authdata,
                               krb5_authdata ***container);

/*
 * AD-KDCIssued
 */
/**
 * Encode and sign AD-KDCIssued authorization data.
 *
 * @param [in]  context         Library context
 * @param [in]  key             Session key
 * @param [in]  issuer          The name of the issuing principal
 * @param [in]  authdata        List of authorization data to be signed
 * @param [out] ad_kdcissued    List containing AD-KDCIssued authdata
 *
 * This function wraps a list of authorization data entries @a authdata in an
 * AD-KDCIssued container (see RFC 4120 section 5.2.6.2) signed with @a key.
 * The result is returned in @a ad_kdcissued as a single-element list.
 */
krb5_error_code KRB5_CALLCONV
krb5_make_authdata_kdc_issued(krb5_context context,
                              const krb5_keyblock *key,
                              krb5_const_principal issuer,
                              krb5_authdata *const *authdata,
                              krb5_authdata ***ad_kdcissued);

/**
 * Unwrap and verify AD-KDCIssued authorization data.
 *
 * @param [in] context          Library context
 * @param [in] key              Session key
 * @param [in] ad_kdcissued     AD-KDCIssued authorization data to be unwrapped
 * @param [out] issuer          Name of issuing principal (or NULL)
 * @param [out] authdata        Unwrapped list of authorization data
 *
 * This function unwraps an AD-KDCIssued authdatum (see RFC 4120 section
 * 5.2.6.2) and verifies its signature against @a key.  The issuer field of the
 * authdatum element is returned in @a issuer, and the unwrapped list of
 * authdata is returned in @a authdata.
 */
krb5_error_code KRB5_CALLCONV
krb5_verify_authdata_kdc_issued(krb5_context context,
                                const krb5_keyblock *key,
                                const krb5_authdata *ad_kdcissued,
                                krb5_principal *issuer,
                                krb5_authdata ***authdata);

/*
 * Windows PAC
 */

/* Microsoft defined types of data */
#define KRB5_PAC_LOGON_INFO        1  /**< Logon information */
#define KRB5_PAC_CREDENTIALS_INFO  2  /**< Credentials information */
#define KRB5_PAC_SERVER_CHECKSUM   6  /**< Server checksum */
#define KRB5_PAC_PRIVSVR_CHECKSUM  7  /**< KDC checksum */
#define KRB5_PAC_CLIENT_INFO       10 /**< Client name and ticket info */
#define KRB5_PAC_DELEGATION_INFO   11 /**< Constrained delegation info */
#define KRB5_PAC_UPN_DNS_INFO      12 /**< User principal name and DNS info */

struct krb5_pac_data;
/** PAC data structure to convey authorization information */
typedef struct krb5_pac_data *krb5_pac;

/**
 * Add a buffer to a PAC handle.
 *
 * @param [in] context          Library context
 * @param [in] pac              PAC handle
 * @param [in] type             Buffer type
 * @param [in] data             contents
 *
 * This function adds a buffer of type @a type and contents @a data to @a pac
 * if there isn't already a buffer of this type present.
 *
 * The valid values of @a type is one of the following:
 * @li #KRB5_PAC_LOGON_INFO         -  Logon information
 * @li #KRB5_PAC_CREDENTIALS_INFO   -  Credentials information
 * @li #KRB5_PAC_SERVER_CHECKSUM    -  Server checksum
 * @li #KRB5_PAC_PRIVSVR_CHECKSUM   -  KDC checksum
 * @li #KRB5_PAC_CLIENT_INFO        -  Client name and ticket information
 * @li #KRB5_PAC_DELEGATION_INFO    -  Constrained delegation information
 * @li #KRB5_PAC_UPN_DNS_INFO       -  User principal name and DNS information
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_add_buffer(krb5_context context, krb5_pac pac, krb5_ui_4 type,
                    const krb5_data *data);

/**
 * Free a PAC handle.
 *
 * @param [in] context         Library context
 * @param [in] pac             PAC to be freed
 *
 * This function frees the contents of @a pac and the structure itself.
 */
void KRB5_CALLCONV
krb5_pac_free(krb5_context context, krb5_pac pac);

/**
 * Retrieve a buffer value from a PAC.
 *
 * @param [in]  context         Library context
 * @param [in]  pac             PAC handle
 * @param [in]  type            Type of buffer to retrieve
 * @param [out] data            Buffer value
 *
 * Use krb5_free_data_contents() to free @a data when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_get_buffer(krb5_context context, krb5_pac pac, krb5_ui_4 type,
                    krb5_data *data);

/**
 * Return an array of buffer types in a PAC handle.
 *
 * @param [in]  context         Library context
 * @param [in]  pac             PAC handle
 * @param [out] len             Number of entries in @a types
 * @param [out] types           Array of buffer types
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_get_types(krb5_context context, krb5_pac pac, size_t *len,
                   krb5_ui_4 **types);

/**
 * Create an empty Privilege Attribute Certificate (PAC) handle.
 *
 * @param [in]  context         Library context
 * @param [out] pac             New PAC handle
 *
 * Use krb5_pac_free() to free @a pac when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_init(krb5_context context, krb5_pac *pac);

/**
 * Unparse an encoded PAC into a new handle.
 *
 * @param [in]  context         Library context
 * @param [in]  ptr             PAC buffer
 * @param [in]  len             Length of @a ptr
 * @param [out] pac             PAC handle
 *
 * Use krb5_pac_free() to free @a pac when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_parse(krb5_context context, const void *ptr, size_t len,
               krb5_pac *pac);

/**
 * Verify a PAC.
 *
 * @param [in] context          Library context
 * @param [in] pac              PAC handle
 * @param [in] authtime         Expected timestamp
 * @param [in] principal        Expected principal name (or NULL)
 * @param [in] server           Key to validate server checksum (or NULL)
 * @param [in] privsvr          Key to validate KDC checksum (or NULL)
 *
 * This function validates @a pac against the supplied @a server, @a privsvr,
 * @a principal and @a authtime.  If @a principal is NULL, the principal and
 * authtime are not verified.  If @a server or @a privsvr is NULL, the
 * corresponding checksum is not verified.
 *
 * If successful, @a pac is marked as verified.
 *
 * @note A checksum mismatch can occur if the PAC was copied from a cross-realm
 * TGT by an ignorant KDC; also macOS Server Open Directory (as of 10.6)
 * generates PACs with no server checksum at all.  One should consider not
 * failing the whole authentication because of this reason, but, instead,
 * treating the ticket as if it did not contain a PAC or marking the PAC
 * information as non-verified.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_verify(krb5_context context, const krb5_pac pac,
                krb5_timestamp authtime, krb5_const_principal principal,
                const krb5_keyblock *server, const krb5_keyblock *privsvr);

/**
 * Verify a PAC, possibly from a specified realm.
 *
 * @param [in] context          Library context
 * @param [in] pac              PAC handle
 * @param [in] authtime         Expected timestamp
 * @param [in] principal        Expected principal name (or NULL)
 * @param [in] server           Key to validate server checksum (or NULL)
 * @param [in] privsvr          Key to validate KDC checksum (or NULL)
 * @param [in] with_realm       If true, expect the realm of @a principal
 *
 * This function is similar to krb5_pac_verify(), but adds a parameter
 * @a with_realm.  If @a with_realm is true, the PAC_CLIENT_INFO field is
 * expected to include the realm of @a principal as well as the name.  This
 * flag is necessary to verify PACs in cross-realm S4U2Self referral TGTs.
 *
 * @version New in 1.17
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_verify_ext(krb5_context context, const krb5_pac pac,
                    krb5_timestamp authtime, krb5_const_principal principal,
                    const krb5_keyblock *server, const krb5_keyblock *privsvr,
                    krb5_boolean with_realm);

/**
 * Sign a PAC.
 *
 * @param [in]  context         Library context
 * @param [in]  pac             PAC handle
 * @param [in]  authtime        Expected timestamp
 * @param [in]  principal       Expected principal name (or NULL)
 * @param [in]  server_key      Key for server checksum
 * @param [in]  privsvr_key     Key for KDC checksum
 * @param [out] data            Signed PAC encoding
 *
 * This function signs @a pac using the keys @a server_key and @a privsvr_key
 * and returns the signed encoding in @a data.  @a pac is modified to include
 * the server and KDC checksum buffers.  Use krb5_free_data_contents() to free
 * @a data when it is no longer needed.
 *
 * @version New in 1.10
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_sign(krb5_context context, krb5_pac pac, krb5_timestamp authtime,
              krb5_const_principal principal, const krb5_keyblock *server_key,
              const krb5_keyblock *privsvr_key, krb5_data *data);

/**
 * Sign a PAC, possibly with a specified realm.
 *
 * @param [in]  context         Library context
 * @param [in]  pac             PAC handle
 * @param [in]  authtime        Expected timestamp
 * @param [in]  principal       Principal name (or NULL)
 * @pa