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
|
/*
* Copyright (c) mjh-EDV Beratung, 1996-1999
* mjh-EDV Beratung - 63263 Neu-Isenburg - Rosenstrasse 12
* Tel +49 6102 328279 - Fax +49 6102 328278
* Email info@mjh.teddy-net.com
*
* Author: Jordan Hrycaj <jordan@mjh.teddy-net.com>
*
* $Id: us_export_wizard.c,v 1.5 2000/08/14 21:18:06 jordan Exp $
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "common-stuff.h"
#ifndef HAVE_RAND
#define rand() random ()
#define srand() srandom ()
#endif
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#define P printf
void
blurb
(void)
{
P ("/*\n");
P (" * Copyright (c) mjh-EDV Beratung, 1996-1999\n");
P (" * mjh-EDV Beratung - 63263 Neu-Isenburg - Rosenstrasse 12\n");
P (" * Tel +49 6102 328279 - Fax +49 6102 328278\n");
P (" * Email info@mjh.teddy-net.com\n");
P (" *\n");
P (" * Author: Jordan Hrycaj <jordan@mjh.teddy-net.com>\n");
P (" *\n");
P (" * $Id: us_export_wizard.c,v 1.5 2000/08/14 21:18:06 jordan Exp $\n");
P (" *\n");
P (" * This library is free software; you can redistribute it and/or\n");
P (" * modify it under the terms of the GNU Library General Public\n");
P (" * License as published by the Free Software Foundation; either\n");
P (" * version 2 of the License, or (at your option) any later version.\n");
P (" *\n");
P (" * This library is distributed in the hope that it will be useful,\n");
P (" * but WITHOUT ANY WARRANTY; without even the implied warranty of\n");
P (" * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n");
P (" * Library General Public License for more details.\n");
P (" *\n");
P (" * You should have received a copy of the GNU Library General Public\n");
P (" * License along with this library; if not, write to the Free\n");
P (" * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.\n");
P (" *\n");
P (" * @(#) key weakener - make a cipher key US export laws conformant ...\n");
P (" */\n\n");
}
void
print_key_warning_line
(char *pragma,
char *keytype,
unsigned len)
{
P ("# %s Restricting %s key lengths to %u bits\n", pragma, keytype, len);
}
void
print_key_warning
(char *keytype,
unsigned len)
{
P ("#ifdef HAVE_PRAGMA_MESSAGE\n");
print_key_warning_line ("pragma message", keytype, len);
P ("#else\n");
print_key_warning_line ("warning", keytype, len);
P ("#endif /* HAVE_PRAGMA_MESSAGE */\n\n");
}
int
main
(int argc,
char **argv)
{
int skeybits = argc > 1 ? atoi (argv [1]) : 9999 ;
int skeylen = skeybits > 5 ? skeybits/8 : 5 ;
int akeybits = argc > 2 ? atoi (argv [2]) : 9999 ;
int akeylen = akeybits > 112 ? akeybits/8 : 14 ;
int alen = 20 ;
skeybits = skeylen * 8 ;
blurb ();
P ("#ifndef __US_EXPORT_WIZARD__\n");
P ("#define __US_EXPORT_WIZARD__\n\n");
if (skeylen > 16 && akeylen > 1200) {
P ("/* We do not need a key weakener, here. */\n");
P ("#undef STATIC_KEY_POSTFIX\n");
P ("#undef TRUE_KEY_BITS\n");
P ("#undef TRUE_KEY_BYTES\n");
P ("#undef US_EXPORT_MAGICIAN\n");
P ("#undef US_EXPORT_ELG_BITS\n");
P ("#undef TRUE_ELG_KEY_BITS \n");
P ("#undef TRUE_ELG_KEY_BYTES\n");
P ("\n");
} else {
unsigned char fp [8] ;
int n, j, k ;
#ifdef HAVE_GETTIMEOFDAY
struct timeval tv ;
gettimeofday2 (&tv, 0);
srand (tv.tv_usec);
#else
srand (time (0));
#endif
if (skeylen > 16) {
skeylen = 16 ;
skeybits = 128 ;
}
if (skeylen > akeylen) {
skeylen = akeylen - 1 ;
skeybits = skeylen * 8 ;
}
print_key_warning ("session", skeybits) ;
P ("#define TRUE_KEY_BITS %3u\n", skeybits);
P ("#define TRUE_KEY_BYTES %3u\n", skeylen);
P ("#define STATIC_KEY_POSTFIX {");
for (n = j = k = 0; n < alen; n ++, j ++, k ++) {
/* calculate an integer smaller than 256.0 - 1/(RAND_MAX-1.0) */
unsigned char r = (256.0 * rand () / (RAND_MAX+1.0)) ;
if (j > 6) { j = 0 ; P ("\\\n "); }
if (k < sizeof (fp)) fp [k] = r ;
P (" 0x%02x,", r);
}
P (" 0 }\n\n");
P ("#define US_EXPORT_BITS \"%u\"\n", skeybits);
P ("#define US_EXPORT_FINGERPRINT \"");
for (j = k = 0; k < sizeof (fp); j ++, k ++) {
if (j >= (sizeof (fp)/2)) { j = 0 ; P (" "); }
if (k) P (" ");
P ("%02x", fp [k]);
}
P ("\"\n\n");
P ("#define US_EXPORT_MAGICIAN( key, len) \t\t\t\t\\\n");
P ("\tif ((len) > %u) { \t\t\t\t\t\\\n", skeylen);
P ("\t\tchar p [] = STATIC_KEY_POSTFIX, i, j; \t\t\\\n");
P ("\t\tfor (i = %u, j = 0; i < (len); i ++, j ++) { \t\\\n", skeylen);
P ("\t\t\tif (j >= %u) j = 0 ; \t\t\t\\\n", alen);
P ("\t\t\t(key) [i] = p [j]; \t\t\t\\\n");
P ("\t\t} \t\t\t\t\t\t\\\n");
P ("\t}\n\n");
if (akeybits < 5000) {
print_key_warning ("El Gamal", akeybits) ;
P ("#define US_EXPORT_ELG_BITS \"%u\"\n", akeybits);
P ("#define TRUE_ELG_KEY_BITS %3u\n", akeybits);
P ("#define TRUE_ELG_KEY_BYTES %3u\n", akeylen);
P ("\n");
} else {
P ("#undef US_EXPORT_ELG_BITS\n");
P ("#undef TRUE_ELG_KEY_BITS \n");
P ("#undef TRUE_ELG_KEY_BYTES\n");
}
}
P ("#endif /* __US_EXPORT_WIZARD__*/\n");
exit (0) ;
}
|
