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d02b48c6 | 1 | /* crypto/dsa/dsa_gen.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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 | |
a87030a1 BM |
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) */ | |
323f289c | 64 | #define HASH EVP_sha() |
d02b48c6 | 65 | #else |
a87030a1 BM |
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) */ | |
323f289c | 69 | #define HASH EVP_sha1() |
d02b48c6 RE |
70 | #endif |
71 | ||
751ff1d3 RL |
72 | #include <openssl/opensslconf.h> /* To see if OPENSSL_NO_SHA is defined */ |
73 | ||
cf1b7d96 | 74 | #ifndef OPENSSL_NO_SHA |
a87030a1 | 75 | |
20818e00 DSH |
76 | #define OPENSSL_FIPSEVP |
77 | ||
d02b48c6 | 78 | #include <stdio.h> |
d02b48c6 | 79 | #include "cryptlib.h" |
323f289c | 80 | #include <openssl/evp.h> |
ec577822 | 81 | #include <openssl/bn.h> |
ec577822 | 82 | #include <openssl/rand.h> |
dbad1690 | 83 | #include <openssl/sha.h> |
20818e00 DSH |
84 | #ifdef OPENSSL_FIPS |
85 | #include <openssl/fips.h> | |
86 | #endif | |
87 | ||
357d5de5 | 88 | #include "dsa_locl.h" |
0e4aa0d2 | 89 | |
e9224c71 | 90 | int DSA_generate_parameters_ex(DSA *ret, int bits, |
1457619e | 91 | const unsigned char *seed_in, int seed_len, |
e9224c71 | 92 | int *counter_ret, unsigned long *h_ret, BN_GENCB *cb) |
d02b48c6 | 93 | { |
0e4aa0d2 GT |
94 | if(ret->meth->dsa_paramgen) |
95 | return ret->meth->dsa_paramgen(ret, bits, seed_in, seed_len, | |
96 | counter_ret, h_ret, cb); | |
357d5de5 NL |
97 | else |
98 | { | |
99 | const EVP_MD *evpmd; | |
100 | size_t qbits = bits >= 2048 ? 256 : 160; | |
101 | ||
102 | if (bits >= 2048) | |
103 | { | |
104 | qbits = 256; | |
105 | evpmd = EVP_sha256(); | |
106 | } | |
107 | else | |
108 | { | |
109 | qbits = 160; | |
110 | evpmd = EVP_sha1(); | |
111 | } | |
112 | ||
113 | return dsa_builtin_paramgen(ret, bits, qbits, evpmd, | |
198ce9a6 | 114 | seed_in, seed_len, NULL, counter_ret, h_ret, cb); |
357d5de5 | 115 | } |
0e4aa0d2 GT |
116 | } |
117 | ||
357d5de5 | 118 | int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits, |
1457619e | 119 | const EVP_MD *evpmd, const unsigned char *seed_in, size_t seed_len, |
198ce9a6 | 120 | unsigned char *seed_out, |
357d5de5 | 121 | int *counter_ret, unsigned long *h_ret, BN_GENCB *cb) |
0e4aa0d2 | 122 | { |
d02b48c6 | 123 | int ok=0; |
357d5de5 NL |
124 | unsigned char seed[SHA256_DIGEST_LENGTH]; |
125 | unsigned char md[SHA256_DIGEST_LENGTH]; | |
126 | unsigned char buf[SHA256_DIGEST_LENGTH],buf2[SHA256_DIGEST_LENGTH]; | |
d02b48c6 RE |
127 | BIGNUM *r0,*W,*X,*c,*test; |
128 | BIGNUM *g=NULL,*q=NULL,*p=NULL; | |
dfeab068 | 129 | BN_MONT_CTX *mont=NULL; |
c8bbd98a | 130 | int i, k, n=0, m=0, qsize = qbits >> 3; |
d02b48c6 | 131 | int counter=0; |
a87030a1 | 132 | int r=0; |
08e1cbc6 | 133 | BN_CTX *ctx=NULL; |
d02b48c6 | 134 | unsigned int h=2; |
d02b48c6 | 135 | |
20818e00 DSH |
136 | #ifdef OPENSSL_FIPS |
137 | if(FIPS_selftest_failed()) | |
138 | { | |
139 | FIPSerr(FIPS_F_DSA_BUILTIN_PARAMGEN, | |
140 | FIPS_R_FIPS_SELFTEST_FAILED); | |
141 | goto err; | |
142 | } | |
143 | ||
144 | if (FIPS_mode() && (bits < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS)) | |
145 | { | |
146 | DSAerr(DSA_F_DSA_BUILTIN_PARAMGEN, DSA_R_KEY_SIZE_TOO_SMALL); | |
147 | goto err; | |
148 | } | |
149 | #endif | |
150 | ||
357d5de5 NL |
151 | if (qsize != SHA_DIGEST_LENGTH && qsize != SHA224_DIGEST_LENGTH && |
152 | qsize != SHA256_DIGEST_LENGTH) | |
153 | /* invalid q size */ | |
154 | return 0; | |
d02b48c6 | 155 | |
357d5de5 NL |
156 | if (evpmd == NULL) |
157 | /* use SHA1 as default */ | |
158 | evpmd = EVP_sha1(); | |
d02b48c6 | 159 | |
357d5de5 NL |
160 | if (bits < 512) |
161 | bits = 512; | |
dfeab068 | 162 | |
357d5de5 NL |
163 | bits = (bits+63)/64*64; |
164 | ||
fcd1cb66 DSH |
165 | /* NB: seed_len == 0 is special case: copy generated seed to |
166 | * seed_in if it is not NULL. | |
167 | */ | |
168 | if (seed_len && (seed_len < (size_t)qsize)) | |
357d5de5 | 169 | seed_in = NULL; /* seed buffer too small -- ignore */ |
3627fedb | 170 | if (seed_len > (size_t)qsize) |
357d5de5 NL |
171 | seed_len = qsize; /* App. 2.2 of FIPS PUB 186 allows larger SEED, |
172 | * but our internal buffers are restricted to 160 bits*/ | |
173 | if (seed_in != NULL) | |
174 | memcpy(seed, seed_in, seed_len); | |
175 | ||
176 | if ((ctx=BN_CTX_new()) == NULL) | |
177 | goto err; | |
178 | ||
179 | if ((mont=BN_MONT_CTX_new()) == NULL) | |
180 | goto err; | |
dfeab068 | 181 | |
08e1cbc6 GT |
182 | BN_CTX_start(ctx); |
183 | r0 = BN_CTX_get(ctx); | |
184 | g = BN_CTX_get(ctx); | |
185 | W = BN_CTX_get(ctx); | |
186 | q = BN_CTX_get(ctx); | |
187 | X = BN_CTX_get(ctx); | |
188 | c = BN_CTX_get(ctx); | |
189 | p = BN_CTX_get(ctx); | |
190 | test = BN_CTX_get(ctx); | |
d02b48c6 | 191 | |
41c70d47 DSH |
192 | if (!BN_lshift(test,BN_value_one(),bits-1)) |
193 | goto err; | |
d02b48c6 RE |
194 | |
195 | for (;;) | |
196 | { | |
a87030a1 | 197 | for (;;) /* find q */ |
d02b48c6 | 198 | { |
7865b871 | 199 | int seed_is_random; |
a87030a1 | 200 | |
d02b48c6 | 201 | /* step 1 */ |
e9224c71 GT |
202 | if(!BN_GENCB_call(cb, 0, m++)) |
203 | goto err; | |
d02b48c6 RE |
204 | |
205 | if (!seed_len) | |
a87030a1 | 206 | { |
357d5de5 | 207 | RAND_pseudo_bytes(seed, qsize); |
a87030a1 BM |
208 | seed_is_random = 1; |
209 | } | |
d02b48c6 | 210 | else |
7865b871 BM |
211 | { |
212 | seed_is_random = 0; | |
213 | seed_len=0; /* use random seed if 'seed_in' turns out to be bad*/ | |
214 | } | |
357d5de5 NL |
215 | memcpy(buf , seed, qsize); |
216 | memcpy(buf2, seed, qsize); | |
a87030a1 | 217 | /* precompute "SEED + 1" for step 7: */ |
357d5de5 | 218 | for (i = qsize-1; i >= 0; i--) |
d02b48c6 RE |
219 | { |
220 | buf[i]++; | |
357d5de5 NL |
221 | if (buf[i] != 0) |
222 | break; | |
d02b48c6 RE |
223 | } |
224 | ||
225 | /* step 2 */ | |
b6dcdbfc DSH |
226 | if (!EVP_Digest(seed, qsize, md, NULL, evpmd, NULL)) |
227 | goto err; | |
228 | if (!EVP_Digest(buf, qsize, buf2, NULL, evpmd, NULL)) | |
229 | goto err; | |
357d5de5 | 230 | for (i = 0; i < qsize; i++) |
d02b48c6 RE |
231 | md[i]^=buf2[i]; |
232 | ||
233 | /* step 3 */ | |
357d5de5 NL |
234 | md[0] |= 0x80; |
235 | md[qsize-1] |= 0x01; | |
236 | if (!BN_bin2bn(md, qsize, q)) | |
237 | goto err; | |
d02b48c6 RE |
238 | |
239 | /* step 4 */ | |
08e1cbc6 | 240 | r = BN_is_prime_fasttest_ex(q, DSS_prime_checks, ctx, |
e9224c71 | 241 | seed_is_random, cb); |
a87030a1 | 242 | if (r > 0) |
aff0825c | 243 | break; |
a87030a1 | 244 | if (r != 0) |
aff0825c | 245 | goto err; |
a87030a1 | 246 | |
d02b48c6 RE |
247 | /* do a callback call */ |
248 | /* step 5 */ | |
249 | } | |
250 | ||
e9224c71 GT |
251 | if(!BN_GENCB_call(cb, 2, 0)) goto err; |
252 | if(!BN_GENCB_call(cb, 3, 0)) goto err; | |
d02b48c6 RE |
253 | |
254 | /* step 6 */ | |
255 | counter=0; | |
a87030a1 | 256 | /* "offset = 2" */ |
d02b48c6 RE |
257 | |
258 | n=(bits-1)/160; | |
d02b48c6 RE |
259 | |
260 | for (;;) | |
261 | { | |
e9224c71 GT |
262 | if ((counter != 0) && !BN_GENCB_call(cb, 0, counter)) |
263 | goto err; | |
a87030a1 | 264 | |
d02b48c6 | 265 | /* step 7 */ |
c01d2b97 | 266 | BN_zero(W); |
a87030a1 | 267 | /* now 'buf' contains "SEED + offset - 1" */ |
d02b48c6 RE |
268 | for (k=0; k<=n; k++) |
269 | { | |
a87030a1 | 270 | /* obtain "SEED + offset + k" by incrementing: */ |
357d5de5 | 271 | for (i = qsize-1; i >= 0; i--) |
d02b48c6 RE |
272 | { |
273 | buf[i]++; | |
357d5de5 NL |
274 | if (buf[i] != 0) |
275 | break; | |
d02b48c6 RE |
276 | } |
277 | ||
b6dcdbfc DSH |
278 | if (!EVP_Digest(buf, qsize, md ,NULL, evpmd, |
279 | NULL)) | |
280 | goto err; | |
d02b48c6 RE |
281 | |
282 | /* step 8 */ | |
357d5de5 | 283 | if (!BN_bin2bn(md, qsize, r0)) |
38e33cef | 284 | goto err; |
357d5de5 | 285 | if (!BN_lshift(r0,r0,(qsize << 3)*k)) goto err; |
41c70d47 | 286 | if (!BN_add(W,W,r0)) goto err; |
d02b48c6 RE |
287 | } |
288 | ||
289 | /* more of step 8 */ | |
41c70d47 DSH |
290 | if (!BN_mask_bits(W,bits-1)) goto err; |
291 | if (!BN_copy(X,W)) goto err; | |
292 | if (!BN_add(X,X,test)) goto err; | |
d02b48c6 RE |
293 | |
294 | /* step 9 */ | |
41c70d47 DSH |
295 | if (!BN_lshift1(r0,q)) goto err; |
296 | if (!BN_mod(c,X,r0,ctx)) goto err; | |
297 | if (!BN_sub(r0,c,BN_value_one())) goto err; | |
298 | if (!BN_sub(p,X,r0)) goto err; | |
d02b48c6 RE |
299 | |
300 | /* step 10 */ | |
301 | if (BN_cmp(p,test) >= 0) | |
302 | { | |
303 | /* step 11 */ | |
e9224c71 | 304 | r = BN_is_prime_fasttest_ex(p, DSS_prime_checks, |
08e1cbc6 | 305 | ctx, 1, cb); |
a87030a1 BM |
306 | if (r > 0) |
307 | goto end; /* found it */ | |
308 | if (r != 0) | |
309 | goto err; | |
d02b48c6 RE |
310 | } |
311 | ||
312 | /* step 13 */ | |
313 | counter++; | |
a87030a1 | 314 | /* "offset = offset + n + 1" */ |
d02b48c6 RE |
315 | |
316 | /* step 14 */ | |
317 | if (counter >= 4096) break; | |
d02b48c6 RE |
318 | } |
319 | } | |
320 | end: | |
e9224c71 GT |
321 | if(!BN_GENCB_call(cb, 2, 1)) |
322 | goto err; | |
d02b48c6 | 323 | |
38e33cef | 324 | /* We now need to generate g */ |
d02b48c6 | 325 | /* Set r0=(p-1)/q */ |
41c70d47 DSH |
326 | if (!BN_sub(test,p,BN_value_one())) goto err; |
327 | if (!BN_div(r0,NULL,test,q,ctx)) goto err; | |
d02b48c6 | 328 | |
41c70d47 DSH |
329 | if (!BN_set_word(test,h)) goto err; |
330 | if (!BN_MONT_CTX_set(mont,p,ctx)) goto err; | |
dfeab068 | 331 | |
d02b48c6 RE |
332 | for (;;) |
333 | { | |
334 | /* g=test^r0%p */ | |
41c70d47 | 335 | if (!BN_mod_exp_mont(g,test,r0,p,ctx,mont)) goto err; |
d02b48c6 | 336 | if (!BN_is_one(g)) break; |
41c70d47 | 337 | if (!BN_add(test,test,BN_value_one())) goto err; |
d02b48c6 RE |
338 | h++; |
339 | } | |
340 | ||
e9224c71 GT |
341 | if(!BN_GENCB_call(cb, 3, 1)) |
342 | goto err; | |
d02b48c6 RE |
343 | |
344 | ok=1; | |
345 | err: | |
e9224c71 | 346 | if (ok) |
d02b48c6 | 347 | { |
e9224c71 GT |
348 | if(ret->p) BN_free(ret->p); |
349 | if(ret->q) BN_free(ret->q); | |
350 | if(ret->g) BN_free(ret->g); | |
d02b48c6 RE |
351 | ret->p=BN_dup(p); |
352 | ret->q=BN_dup(q); | |
353 | ret->g=BN_dup(g); | |
41c70d47 DSH |
354 | if (ret->p == NULL || ret->q == NULL || ret->g == NULL) |
355 | { | |
356 | ok=0; | |
357 | goto err; | |
358 | } | |
d02b48c6 RE |
359 | if (counter_ret != NULL) *counter_ret=counter; |
360 | if (h_ret != NULL) *h_ret=h; | |
198ce9a6 DSH |
361 | if (seed_out) |
362 | memcpy(seed_out, seed, qsize); | |
d02b48c6 | 363 | } |
08e1cbc6 | 364 | if(ctx) |
9b141126 | 365 | { |
08e1cbc6 GT |
366 | BN_CTX_end(ctx); |
367 | BN_CTX_free(ctx); | |
9b141126 | 368 | } |
dfeab068 | 369 | if (mont != NULL) BN_MONT_CTX_free(mont); |
e9224c71 | 370 | return ok; |
d02b48c6 | 371 | } |
d02f751c | 372 | #endif |