File: rdrand.S

package info (click to toggle)
libcrypto++ 5.6.4-7
  • links: PTS
  • area: main
  • in suites: stretch
  • size: 11,892 kB
  • ctags: 13,256
  • sloc: cpp: 69,231; sh: 4,117; asm: 4,090; makefile: 363
file content (596 lines) | stat: -rw-r--r-- 11,700 bytes parent folder | download | duplicates (3)
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
;; rdrand.asm - written and placed in public domain by Jeffrey Walton and Uri Blumenthal.
;;              Copyright assigned to the Crypto++ project.

;; This ASM file provides RDRAND and RDSEED to downlevel Unix and Linux tool chains.
;; Additionally, the inline assembly code produced by GCC and Clang is not that
;; impressive. However, using this code requires NASM and an edit to the GNUmakefile.

;; nasm -f elf32 rdrand.S -DX86 -g -o rdrand-x86.o
;; nasm -f elfx32 rdrand.S -DX32 -g -o rdrand-x32.o
;; nasm -f elf64 rdrand.S -DX64 -g -o rdrand-x64.o

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; Naming convention used in rdrand.{h|cpp|asm|S}
;;   MSC = Microsoft Compiler (and compatibles)
;;   GCC = GNU Compiler (and compatibles)
;;   ALL = MSC and GCC (and compatibles)
;;   RRA = RDRAND, Assembly
;;   RSA = RDSEED, Assembly
;;   RRI = RDRAND, Intrinsic
;;   RSA = RDSEED, Intrinsic

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; C/C++ Function prototypes
;;   X86, X32 and X64:
;;     extern "C" int NASM_RRA_GenerateBlock(byte* ptr, size_t size, unsigned int safety);

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; Return values
%define RDRAND_SUCCESS 1
%define RDRAND_FAILURE 0

%define RDSEED_SUCCESS 1
%define RDSEED_FAILURE 0

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

%ifdef X86 or X32   ;; Set via the command line

;; Arg1, byte* buffer
;; Arg2, size_t bsize
;; Arg3, unsigned int safety
;; EAX (out): success (1), failure (0)

global 		NASM_RRA_GenerateBlock
section		.text

%ifdef X86
align		8
cpu 		486
%else
align		16
%endif

NASM_RRA_GenerateBlock:

%ifdef X86
%define arg1 [ebp+04h]
%define arg2 [ebp+08h]
%define arg3 [ebp+0ch]
%define MWSIZE 04h    ;; machine word size
%else
%define MWSIZE 08h    ;; machine word size
%endif

	%define buffer edi
	%define bsize  esi
	%define safety edx

%ifdef X86
.Load_Arguments:

	mov		buffer, arg1
	mov		bsize,  arg2
	mov		safety, arg3
%endif

.Validate_Pointer:

	cmp		buffer, 0
	je 		.GenerateBlock_PreRet

			;; Top of While loop
.GenerateBlock_Top:

			;; Check remaining size
	cmp		bsize, 0
	je		.GenerateBlock_Success

%ifdef X86
.Call_RDRAND_EAX:
%else
.Call_RDRAND_RAX:
	DB 		48h	;; X32 can use the full register, issue the REX.w prefix
%endif
			;; RDRAND is not available prior to VS2012. Just emit
			;;   the byte codes using DB. This is `rdrand eax`.
	DB		0Fh, 07h, 0F0h

			;; If CF=1, the number returned by RDRAND is valid.
			;; If CF=0, a random number was not available.
	jc 		.RDRAND_succeeded

.RDRAND_failed:

			;; Exit if we've reached the limit
	cmp		safety, 0
	je		.GenerateBlock_Failure

	dec		safety
	jmp		.GenerateBlock_Top

.RDRAND_succeeded:

	cmp		bsize, MWSIZE
	jb		.Partial_Machine_Word

.Full_Machine_Word:

%ifdef X32
	mov		[buffer+4], eax		;; We can only move 4 at a time
	DB		048h				;; Combined, these result in
	shr		eax, 32				;;   `shr rax, 32`
%endif

	mov		[buffer], eax
	add		buffer, MWSIZE		;; No need for Intel Core 2 slow word workarounds,
	sub		bsize, MWSIZE		;;   like `lea buffer,[buffer+MWSIZE]` for faster adds

			;; Continue
	jmp		.GenerateBlock_Top

			;; 1,2,3 bytes remain for X86
			;; 1,2,3,4,5,6,7 remain for X32
.Partial_Machine_Word:

%ifdef X32
			;; Test bit 2 to see if size is at least 4
	test		bsize, 4
	jz		.Bit_2_Not_Set

	mov		[buffer], eax
	add		buffer, 4

	DB		048h			;; Combined, these result in
	shr		eax, 32			;;   `shr rax, 32`

.Bit_2_Not_Set:
%endif

			;; Test bit 1 to see if size is at least 2
	test		bsize, 2
	jz		.Bit_1_Not_Set

	mov		[buffer], ax
	shr		eax, 16
	add		buffer, 2

.Bit_1_Not_Set:

			;; Test bit 0 to see if size is at least 1
	test		bsize, 1
	jz		.GenerateBlock_Success

	mov		[buffer], al

.Bit_0_Not_Set:

			;; We've hit all the bits
	jmp		.GenerateBlock_Success

.GenerateBlock_PreRet:

			;; Test for success (was the request completely fulfilled?)
	cmp		bsize, 0
	je 		.GenerateBlock_Success

.GenerateBlock_Failure:

	xor		eax, eax
	mov		al, RDRAND_FAILURE
	ret

.GenerateBlock_Success:

	xor		eax, eax
	mov		al, RDRAND_SUCCESS
	ret

%endif    ;; X86 and X32

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

%ifdef X64    ;; Set via the command line

global		NASM_RRA_GenerateBlock
section		.text
align		16

;; Arg1, byte* buffer
;; Arg2, size_t bsize
;; Arg3, unsigned int safety
;; RAX (out): success (1), failure (0)

NASM_RRA_GenerateBlock:

%define MWSIZE  08h    ;; machine word size
%define buffer  rdi
%define bsize   rsi
%define safety  edx

	;; No need for Load_Arguments due to fastcall

.Validate_Pointer:

			;; Validate pointer
	cmp		buffer, 0
	je 		.GenerateBlock_PreRet

			;; Top of While loop
.GenerateBlock_Top:

			;; Check remaining size
	cmp		bsize, 0
	je		.GenerateBlock_Success

.Call_RDRAND_RAX:
			;; RDRAND is not available prior to VS2012. Just emit
			;;   the byte codes using DB. This is `rdrand rax`.
	DB 		048h, 0Fh, 0C7h, 0F0h

			;; If CF=1, the number returned by RDRAND is valid.
			;; If CF=0, a random number was not available.
	jc 		.RDRAND_succeeded

.RDRAND_failed:

			;; Exit if we've reached the limit
	cmp		safety, 0h
	je		.GenerateBlock_Failure

	dec		safety
	jmp		.GenerateBlock_Top

.RDRAND_succeeded:

	cmp		bsize, MWSIZE
	jb		.Partial_Machine_Word

.Full_Machine_Word:

	mov		[buffer], rax
	add		buffer, MWSIZE
	sub		bsize, MWSIZE

			;; Continue
	jmp		.GenerateBlock_Top

			;; 1,2,3,4,5,6,7 bytes remain
.Partial_Machine_Word:

			;; Test bit 2 to see if size is at least 4
	test		bsize, 4
	jz		.Bit_2_Not_Set

	mov		[buffer], eax
	shr		rax, 32
	add		buffer, 4

.Bit_2_Not_Set:

			;; Test bit 1 to see if size is at least 2
	test		bsize, 2
	jz		.Bit_1_Not_Set

	mov		[buffer], ax
	shr		eax, 16
	add		buffer, 2

.Bit_1_Not_Set:

			;; Test bit 0 to see if size is at least 1
	test		bsize, 1
	jz		.GenerateBlock_Success

	mov		[buffer], al

.Bit_0_Not_Set:

			;; We've hit all the bits
	jmp		.GenerateBlock_Success

.GenerateBlock_PreRet:

			;; Test for success (was the request completely fulfilled?)
	cmp		bsize, 0
	je 		.GenerateBlock_Success

.GenerateBlock_Failure:

	xor		rax, rax
	mov		al, RDRAND_FAILURE
	ret

.GenerateBlock_Success:

	xor		rax, rax
	mov		al, RDRAND_SUCCESS
	ret

%endif    ;; X64

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

%ifdef X86 or X32   ;; Set via the command line

;; Arg1, byte* buffer
;; Arg2, size_t bsize
;; Arg3, unsigned int safety
;; EAX (out): success (1), failure (0)

global 		NASM_RSA_GenerateBlock
section		.text
align		8

%ifdef X86
align		8
cpu 		486
%else
align		16
%endif

NASM_RSA_GenerateBlock:

%ifdef X86
%define arg1 [ebp+04h]
%define arg2 [ebp+08h]
%define arg3 [ebp+0ch]
%define MWSIZE 04h    ;; machine word size
%else
%define MWSIZE 08h    ;; machine word size
%endif

	%define buffer edi
	%define bsize  esi
	%define safety edx

%ifdef X86
.Load_Arguments:

	mov		buffer, arg1
	mov		bsize,  arg2
	mov		safety, arg3
%endif

.Validate_Pointer:

	cmp 	buffer, 0
	je 		.GenerateBlock_PreRet

			;; Top of While loop
.GenerateBlock_Top:

			;; Check remaining size
	cmp 	bsize, 0
	je		.GenerateBlock_Success

%ifdef X86
.Call_RDSEED_EAX:
%else
.Call_RDSEED_RAX:
	DB		48h		;; X32 can use the full register, issue the REX.w prefix
%endif
			;; RDSEED is not available prior to VS2012. Just emit
			;;   the byte codes using DB. This is `rdseed eax`.
	DB		0Fh, 0C7h, 0F8h

			;; If CF=1, the number returned by RDSEED is valid.
			;; If CF=0, a random number was not available.
	jc 		.RDSEED_succeeded

.RDSEED_failed:

			;; Exit if we've reached the limit
	cmp		safety, 0
	je		.GenerateBlock_Failure

	dec 	safety
	jmp		.GenerateBlock_Top

.RDSEED_succeeded:

	cmp		bsize, MWSIZE
	jb		.Partial_Machine_Word

.Full_Machine_Word:

	mov		[buffer], eax
	add		buffer, MWSIZE		;; No need for Intel Core 2 slow word workarounds,
	sub		bsize, MWSIZE		;;   like `lea buffer,[buffer+MWSIZE]` for faster adds

			;; Continue
	jmp		.GenerateBlock_Top

			;; 1,2,3 bytes remain for X86
			;; 1,2,3,4,5,6,7 remain for X32
.Partial_Machine_Word:

%ifdef X32
			;; Test bit 2 to see if size is at least 4
	test	bsize, 4
	jz		.Bit_2_Not_Set

	mov		[buffer], eax
	add		buffer, 4

	DB		048h			;; Combined, these result in
	shr		eax, 32			;;   `shr rax, 32`

.Bit_2_Not_Set:
%endif

			;; Test bit 1 to see if size is at least 2
	test	bsize, 2
	jz		.Bit_1_Not_Set

	mov		[buffer], ax
	shr		eax, 16
	add		buffer, 2

.Bit_1_Not_Set:

			;; Test bit 0 to see if size is at least 1
	test	bsize, 1
	jz  	.GenerateBlock_Success

	mov		[buffer], al

.Bit_0_Not_Set:

			;; We've hit all the bits
	jmp		.GenerateBlock_Success

.GenerateBlock_PreRet:

			;; Test for success (was the request completely fulfilled?)
	cmp		bsize, 0
	je 		.GenerateBlock_Success

.GenerateBlock_Failure:

	xor		eax, eax
	mov		al, RDSEED_FAILURE
	ret

.GenerateBlock_Success:

	xor		eax, eax
	mov		al, RDSEED_SUCCESS
	ret

%endif    ;; X86 and X32

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

%ifdef X64    ;; Set via the command line

global		NASM_RSA_GenerateBlock
section		.text
align		16

;; Arg1, byte* buffer
;; Arg2, size_t bsize
;; Arg3, unsigned int safety
;; RAX (out): success (1), failure (0)

NASM_RSA_GenerateBlock:

%define MWSIZE  08h    ;; machine word size
%define buffer  rdi
%define bsize   rsi
%define safety  edx

	;; No need for Load_Arguments due to fastcall

.Validate_Pointer:

			;; Validate pointer
	cmp		buffer, 0
	je 		.GenerateBlock_PreRet

			;; Top of While loop
.GenerateBlock_Top:

			;; Check remaining size
	cmp		bsize, 0
	je		.GenerateBlock_Success

.Call_RDSEED_RAX:
			;; RDSEED is not available prior to VS2012. Just emit
			;;   the byte codes using DB. This is `rdseed rax`.
	DB		048h, 0Fh, 0C7h, 0F8h

			;; If CF=1, the number returned by RDSEED is valid.
			;; If CF=0, a random number was not available.
	jc 		.RDSEED_succeeded

.RDSEED_failed:

			;; Exit if we've reached the limit
	cmp		safety, 0
	je		.GenerateBlock_Failure

	dec 		safety
	jmp		.GenerateBlock_Top

.RDSEED_succeeded:

	cmp		bsize, MWSIZE
	jb		.Partial_Machine_Word

.Full_Machine_Word:

	mov		[buffer], rax
	add		buffer, MWSIZE
	sub		bsize, MWSIZE

			;; Continue
	jmp		.GenerateBlock_Top

			;; 1,2,3,4,5,6,7 bytes remain
.Partial_Machine_Word:

			;; Test bit 2 to see if size is at least 4
	test	bsize, 4
	jz		.Bit_2_Not_Set

	mov		[buffer], eax
	shr		rax, 32
	add		buffer, 4

.Bit_2_Not_Set:

			;; Test bit 1 to see if size is at least 2
	test	bsize, 2
	jz		.Bit_1_Not_Set

	mov		[buffer], ax
	shr		eax, 16
	add		buffer, 2

.Bit_1_Not_Set:

			;; Test bit 0 to see if size is at least 1
	test	bsize, 1
	jz		.GenerateBlock_Success

	mov		[buffer], al

.Bit_0_Not_Set:

			;; We've hit all the bits
	jmp		.GenerateBlock_Success

.GenerateBlock_PreRet:

			;; Test for success (was the request completely fulfilled?)
	cmp 	bsize, 0
	je 		.GenerateBlock_Success

.GenerateBlock_Failure:

	xor		rax, rax
	mov		al, RDSEED_FAILURE
	ret

.GenerateBlock_Success:

	xor		rax, rax
	mov		al, RDSEED_SUCCESS
	ret

%endif    ;; _M_X64

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;