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diff --git a/src/lib/libcrypto/dsa/dsa_gen.c b/src/lib/libcrypto/dsa/dsa_gen.c
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1/* crypto/dsa/dsa_gen.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#undef GENUINE_DSA
60
61#ifdef GENUINE_DSA
62/* Parameter generation follows the original release of FIPS PUB 186,
63 * Appendix 2.2 (i.e. use SHA as defined in FIPS PUB 180) */
64#define HASH EVP_sha()
65#else
66/* Parameter generation follows the updated Appendix 2.2 for FIPS PUB 186,
67 * also Appendix 2.2 of FIPS PUB 186-1 (i.e. use SHA as defined in
68 * FIPS PUB 180-1) */
69#define HASH EVP_sha1()
70#endif
71
72#ifndef OPENSSL_NO_SHA
73
74#include <stdio.h>
75#include <time.h>
76#include "cryptlib.h"
77#include <openssl/evp.h>
78#include <openssl/bn.h>
79#include <openssl/dsa.h>
80#include <openssl/rand.h>
81#include <openssl/sha.h>
82
83#ifndef OPENSSL_FIPS
84DSA *DSA_generate_parameters(int bits,
85 unsigned char *seed_in, int seed_len,
86 int *counter_ret, unsigned long *h_ret,
87 void (*callback)(int, int, void *),
88 void *cb_arg)
89 {
90 int ok=0;
91 unsigned char seed[SHA_DIGEST_LENGTH];
92 unsigned char md[SHA_DIGEST_LENGTH];
93 unsigned char buf[SHA_DIGEST_LENGTH],buf2[SHA_DIGEST_LENGTH];
94 BIGNUM *r0,*W,*X,*c,*test;
95 BIGNUM *g=NULL,*q=NULL,*p=NULL;
96 BN_MONT_CTX *mont=NULL;
97 int k,n=0,i,b,m=0;
98 int counter=0;
99 int r=0;
100 BN_CTX *ctx=NULL,*ctx2=NULL,*ctx3=NULL;
101 unsigned int h=2;
102 DSA *ret=NULL;
103
104 if (bits < 512) bits=512;
105 bits=(bits+63)/64*64;
106
107 if (seed_len < 20)
108 seed_in = NULL; /* seed buffer too small -- ignore */
109 if (seed_len > 20)
110 seed_len = 20; /* App. 2.2 of FIPS PUB 186 allows larger SEED,
111 * but our internal buffers are restricted to 160 bits*/
112 if ((seed_in != NULL) && (seed_len == 20))
113 memcpy(seed,seed_in,seed_len);
114
115 if ((ctx=BN_CTX_new()) == NULL) goto err;
116 if ((ctx2=BN_CTX_new()) == NULL) goto err;
117 if ((ctx3=BN_CTX_new()) == NULL) goto err;
118 if ((ret=DSA_new()) == NULL) goto err;
119
120 if ((mont=BN_MONT_CTX_new()) == NULL) goto err;
121
122 BN_CTX_start(ctx2);
123 r0 = BN_CTX_get(ctx2);
124 g = BN_CTX_get(ctx2);
125 W = BN_CTX_get(ctx2);
126 q = BN_CTX_get(ctx2);
127 X = BN_CTX_get(ctx2);
128 c = BN_CTX_get(ctx2);
129 p = BN_CTX_get(ctx2);
130 test = BN_CTX_get(ctx2);
131 if (test == NULL) goto err;
132
133 if (!BN_lshift(test,BN_value_one(),bits-1)) goto err;
134
135 for (;;)
136 {
137 for (;;) /* find q */
138 {
139 int seed_is_random;
140
141 /* step 1 */
142 if (callback != NULL) callback(0,m++,cb_arg);
143
144 if (!seed_len)
145 {
146 RAND_pseudo_bytes(seed,SHA_DIGEST_LENGTH);
147 seed_is_random = 1;
148 }
149 else
150 {
151 seed_is_random = 0;
152 seed_len=0; /* use random seed if 'seed_in' turns out to be bad*/
153 }
154 memcpy(buf,seed,SHA_DIGEST_LENGTH);
155 memcpy(buf2,seed,SHA_DIGEST_LENGTH);
156 /* precompute "SEED + 1" for step 7: */
157 for (i=SHA_DIGEST_LENGTH-1; i >= 0; i--)
158 {
159 buf[i]++;
160 if (buf[i] != 0) break;
161 }
162
163 /* step 2 */
164 EVP_Digest(seed,SHA_DIGEST_LENGTH,md,NULL,HASH, NULL);
165 EVP_Digest(buf,SHA_DIGEST_LENGTH,buf2,NULL,HASH, NULL);
166 for (i=0; i<SHA_DIGEST_LENGTH; i++)
167 md[i]^=buf2[i];
168
169 /* step 3 */
170 md[0]|=0x80;
171 md[SHA_DIGEST_LENGTH-1]|=0x01;
172 if (!BN_bin2bn(md,SHA_DIGEST_LENGTH,q)) goto err;
173
174 /* step 4 */
175 r = BN_is_prime_fasttest(q, DSS_prime_checks, callback, ctx3, cb_arg, seed_is_random);
176 if (r > 0)
177 break;
178 if (r != 0)
179 goto err;
180
181 /* do a callback call */
182 /* step 5 */
183 }
184
185 if (callback != NULL) callback(2,0,cb_arg);
186 if (callback != NULL) callback(3,0,cb_arg);
187
188 /* step 6 */
189 counter=0;
190 /* "offset = 2" */
191
192 n=(bits-1)/160;
193 b=(bits-1)-n*160;
194
195 for (;;)
196 {
197 if (callback != NULL && counter != 0)
198 callback(0,counter,cb_arg);
199
200 /* step 7 */
201 if (!BN_zero(W)) goto err;
202 /* now 'buf' contains "SEED + offset - 1" */
203 for (k=0; k<=n; k++)
204 {
205 /* obtain "SEED + offset + k" by incrementing: */
206 for (i=SHA_DIGEST_LENGTH-1; i >= 0; i--)
207 {
208 buf[i]++;
209 if (buf[i] != 0) break;
210 }
211
212 EVP_Digest(buf,SHA_DIGEST_LENGTH,md,NULL,HASH, NULL);
213
214 /* step 8 */
215 if (!BN_bin2bn(md,SHA_DIGEST_LENGTH,r0))
216 goto err;
217 if (!BN_lshift(r0,r0,160*k)) goto err;
218 if (!BN_add(W,W,r0)) goto err;
219 }
220
221 /* more of step 8 */
222 if (!BN_mask_bits(W,bits-1)) goto err;
223 if (!BN_copy(X,W)) goto err;
224 if (!BN_add(X,X,test)) goto err;
225
226 /* step 9 */
227 if (!BN_lshift1(r0,q)) goto err;
228 if (!BN_mod(c,X,r0,ctx)) goto err;
229 if (!BN_sub(r0,c,BN_value_one())) goto err;
230 if (!BN_sub(p,X,r0)) goto err;
231
232 /* step 10 */
233 if (BN_cmp(p,test) >= 0)
234 {
235 /* step 11 */
236 r = BN_is_prime_fasttest(p, DSS_prime_checks, callback, ctx3, cb_arg, 1);
237 if (r > 0)
238 goto end; /* found it */
239 if (r != 0)
240 goto err;
241 }
242
243 /* step 13 */
244 counter++;
245 /* "offset = offset + n + 1" */
246
247 /* step 14 */
248 if (counter >= 4096) break;
249 }
250 }
251end:
252 if (callback != NULL) callback(2,1,cb_arg);
253
254 /* We now need to generate g */
255 /* Set r0=(p-1)/q */
256 if (!BN_sub(test,p,BN_value_one())) goto err;
257 if (!BN_div(r0,NULL,test,q,ctx)) goto err;
258
259 if (!BN_set_word(test,h)) goto err;
260 if (!BN_MONT_CTX_set(mont,p,ctx)) goto err;
261
262 for (;;)
263 {
264 /* g=test^r0%p */
265 if (!BN_mod_exp_mont(g,test,r0,p,ctx,mont)) goto err;
266 if (!BN_is_one(g)) break;
267 if (!BN_add(test,test,BN_value_one())) goto err;
268 h++;
269 }
270
271 if (callback != NULL) callback(3,1,cb_arg);
272
273 ok=1;
274err:
275 if (!ok)
276 {
277 if (ret != NULL) DSA_free(ret);
278 }
279 else
280 {
281 ret->p=BN_dup(p);
282 ret->q=BN_dup(q);
283 ret->g=BN_dup(g);
284 if (ret->p == NULL || ret->q == NULL || ret->g == NULL)
285 {
286 ok=0;
287 goto err;
288 }
289 if ((m > 1) && (seed_in != NULL)) memcpy(seed_in,seed,20);
290 if (counter_ret != NULL) *counter_ret=counter;
291 if (h_ret != NULL) *h_ret=h;
292 }
293 if (ctx != NULL) BN_CTX_free(ctx);
294 if (ctx2 != NULL)
295 {
296 BN_CTX_end(ctx2);
297 BN_CTX_free(ctx2);
298 }
299 if (ctx3 != NULL) BN_CTX_free(ctx3);
300 if (mont != NULL) BN_MONT_CTX_free(mont);
301 return(ok?ret:NULL);
302 }
303#endif /* ndef OPENSSL_FIPS */
304#endif /* ndef OPENSSL_NO_SHA */
305
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-22 17:24:20 +0000