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| 1 /* crypto/srp/srp_vfy.c */ | |
| 2 /* Written by Christophe Renou (christophe.renou@edelweb.fr) with | |
| 3 * the precious help of Peter Sylvester (peter.sylvester@edelweb.fr) | |
| 4 * for the EdelKey project and contributed to the OpenSSL project 2004. | |
| 5 */ | |
| 6 /* ==================================================================== | |
| 7 * Copyright (c) 2004 The OpenSSL Project. All rights reserved. | |
| 8 * | |
| 9 * Redistribution and use in source and binary forms, with or without | |
| 10 * modification, are permitted provided that the following conditions | |
| 11 * are met: | |
| 12 * | |
| 13 * 1. Redistributions of source code must retain the above copyright | |
| 14 * notice, this list of conditions and the following disclaimer. | |
| 15 * | |
| 16 * 2. Redistributions in binary form must reproduce the above copyright | |
| 17 * notice, this list of conditions and the following disclaimer in | |
| 18 * the documentation and/or other materials provided with the | |
| 19 * distribution. | |
| 20 * | |
| 21 * 3. All advertising materials mentioning features or use of this | |
| 22 * software must display the following acknowledgment: | |
| 23 * "This product includes software developed by the OpenSSL Project | |
| 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
| 25 * | |
| 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
| 27 * endorse or promote products derived from this software without | |
| 28 * prior written permission. For written permission, please contact | |
| 29 * licensing@OpenSSL.org. | |
| 30 * | |
| 31 * 5. Products derived from this software may not be called "OpenSSL" | |
| 32 * nor may "OpenSSL" appear in their names without prior written | |
| 33 * permission of the OpenSSL Project. | |
| 34 * | |
| 35 * 6. Redistributions of any form whatsoever must retain the following | |
| 36 * acknowledgment: | |
| 37 * "This product includes software developed by the OpenSSL Project | |
| 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
| 39 * | |
| 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
| 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
| 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
| 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
| 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
| 51 * OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 52 * ==================================================================== | |
| 53 * | |
| 54 * This product includes cryptographic software written by Eric Young | |
| 55 * (eay@cryptsoft.com). This product includes software written by Tim | |
| 56 * Hudson (tjh@cryptsoft.com). | |
| 57 * | |
| 58 */ | |
| 59 #ifndef OPENSSL_NO_SRP | |
| 60 #include "cryptlib.h" | |
| 61 #include "srp_lcl.h" | |
| 62 #include <openssl/srp.h> | |
| 63 #include <openssl/evp.h> | |
| 64 #include <openssl/buffer.h> | |
| 65 #include <openssl/rand.h> | |
| 66 #include <openssl/txt_db.h> | |
| 67 | |
| 68 #define SRP_RANDOM_SALT_LEN 20 | |
| 69 #define MAX_LEN 2500 | |
| 70 | |
| 71 static char b64table[] = | |
| 72 "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz./"; | |
| 73 | |
| 74 /* the following two conversion routines have been inspired by code from Stanfor
d */ | |
| 75 | |
| 76 /* | |
| 77 * Convert a base64 string into raw byte array representation. | |
| 78 */ | |
| 79 static int t_fromb64(unsigned char *a, const char *src) | |
| 80 { | |
| 81 char *loc; | |
| 82 int i, j; | |
| 83 int size; | |
| 84 | |
| 85 while(*src && (*src == ' ' || *src == '\t' || *src == '\n')) | |
| 86 ++src; | |
| 87 size = strlen(src); | |
| 88 i = 0; | |
| 89 while(i < size) | |
| 90 { | |
| 91 loc = strchr(b64table, src[i]); | |
| 92 if(loc == (char *) 0) break; | |
| 93 else a[i] = loc - b64table; | |
| 94 ++i; | |
| 95 } | |
| 96 size = i; | |
| 97 i = size - 1; | |
| 98 j = size; | |
| 99 while(1) | |
| 100 { | |
| 101 a[j] = a[i]; | |
| 102 if(--i < 0) break; | |
| 103 a[j] |= (a[i] & 3) << 6; | |
| 104 --j; | |
| 105 a[j] = (unsigned char) ((a[i] & 0x3c) >> 2); | |
| 106 if(--i < 0) break; | |
| 107 a[j] |= (a[i] & 0xf) << 4; | |
| 108 --j; | |
| 109 a[j] = (unsigned char) ((a[i] & 0x30) >> 4); | |
| 110 if(--i < 0) break; | |
| 111 a[j] |= (a[i] << 2); | |
| 112 | |
| 113 a[--j] = 0; | |
| 114 if(--i < 0) break; | |
| 115 } | |
| 116 while(a[j] == 0 && j <= size) ++j; | |
| 117 i = 0; | |
| 118 while (j <= size) a[i++] = a[j++]; | |
| 119 return i; | |
| 120 } | |
| 121 | |
| 122 | |
| 123 /* | |
| 124 * Convert a raw byte string into a null-terminated base64 ASCII string. | |
| 125 */ | |
| 126 static char *t_tob64(char *dst, const unsigned char *src, int size) | |
| 127 { | |
| 128 int c, pos = size % 3; | |
| 129 unsigned char b0 = 0, b1 = 0, b2 = 0, notleading = 0; | |
| 130 char *olddst = dst; | |
| 131 | |
| 132 switch(pos) | |
| 133 { | |
| 134 case 1: | |
| 135 b2 = src[0]; | |
| 136 break; | |
| 137 case 2: | |
| 138 b1 = src[0]; | |
| 139 b2 = src[1]; | |
| 140 break; | |
| 141 } | |
| 142 | |
| 143 while(1) | |
| 144 { | |
| 145 c = (b0 & 0xfc) >> 2; | |
| 146 if(notleading || c != 0) | |
| 147 { | |
| 148 *dst++ = b64table[c]; | |
| 149 notleading = 1; | |
| 150 } | |
| 151 c = ((b0 & 3) << 4) | ((b1 & 0xf0) >> 4); | |
| 152 if(notleading || c != 0) | |
| 153 { | |
| 154 *dst++ = b64table[c]; | |
| 155 notleading = 1; | |
| 156 } | |
| 157 c = ((b1 & 0xf) << 2) | ((b2 & 0xc0) >> 6); | |
| 158 if(notleading || c != 0) | |
| 159 { | |
| 160 *dst++ = b64table[c]; | |
| 161 notleading = 1; | |
| 162 } | |
| 163 c = b2 & 0x3f; | |
| 164 if(notleading || c != 0) | |
| 165 { | |
| 166 *dst++ = b64table[c]; | |
| 167 notleading = 1; | |
| 168 } | |
| 169 if(pos >= size) break; | |
| 170 else | |
| 171 { | |
| 172 b0 = src[pos++]; | |
| 173 b1 = src[pos++]; | |
| 174 b2 = src[pos++]; | |
| 175 } | |
| 176 } | |
| 177 | |
| 178 *dst++ = '\0'; | |
| 179 return olddst; | |
| 180 } | |
| 181 | |
| 182 static void SRP_user_pwd_free(SRP_user_pwd *user_pwd) | |
| 183 { | |
| 184 if (user_pwd == NULL) | |
| 185 return; | |
| 186 BN_free(user_pwd->s); | |
| 187 BN_clear_free(user_pwd->v); | |
| 188 OPENSSL_free(user_pwd->id); | |
| 189 OPENSSL_free(user_pwd->info); | |
| 190 OPENSSL_free(user_pwd); | |
| 191 } | |
| 192 | |
| 193 static SRP_user_pwd *SRP_user_pwd_new() | |
| 194 { | |
| 195 SRP_user_pwd *ret = OPENSSL_malloc(sizeof(SRP_user_pwd)); | |
| 196 if (ret == NULL) | |
| 197 return NULL;
| |
| 198 ret->N = NULL; | |
| 199 ret->g = NULL; | |
| 200 ret->s = NULL; | |
| 201 ret->v = NULL; | |
| 202 ret->id = NULL ; | |
| 203 ret->info = NULL; | |
| 204 return ret; | |
| 205 } | |
| 206 | |
| 207 static void SRP_user_pwd_set_gN(SRP_user_pwd *vinfo, const BIGNUM *g, | |
| 208 const BIGNUM *N) | |
| 209 { | |
| 210 vinfo->N = N; | |
| 211 vinfo->g = g; | |
| 212 } | |
| 213 | |
| 214 static int SRP_user_pwd_set_ids(SRP_user_pwd *vinfo, const char *id, | |
| 215 const char *info) | |
| 216 { | |
| 217 if (id != NULL && NULL == (vinfo->id = BUF_strdup(id))) | |
| 218 return 0; | |
| 219 return (info == NULL || NULL != (vinfo->info = BUF_strdup(info))) ; | |
| 220 } | |
| 221 | |
| 222 static int SRP_user_pwd_set_sv(SRP_user_pwd *vinfo, const char *s, | |
| 223 const char *v) | |
| 224 { | |
| 225 unsigned char tmp[MAX_LEN]; | |
| 226 int len; | |
| 227 | |
| 228 if (strlen(s) > MAX_LEN || strlen(v) > MAX_LEN) | |
| 229 return 0; | |
| 230 len = t_fromb64(tmp, v); | |
| 231 if (NULL == (vinfo->v = BN_bin2bn(tmp, len, NULL)) ) | |
| 232 return 0; | |
| 233 len = t_fromb64(tmp, s); | |
| 234 return ((vinfo->s = BN_bin2bn(tmp, len, NULL)) != NULL) ; | |
| 235 } | |
| 236 | |
| 237 static int SRP_user_pwd_set_sv_BN(SRP_user_pwd *vinfo, BIGNUM *s, BIGNUM *v) | |
| 238 { | |
| 239 vinfo->v = v; | |
| 240 vinfo->s = s; | |
| 241 return (vinfo->s != NULL && vinfo->v != NULL) ; | |
| 242 } | |
| 243 | |
| 244 SRP_VBASE *SRP_VBASE_new(char *seed_key) | |
| 245 { | |
| 246 SRP_VBASE *vb = (SRP_VBASE *) OPENSSL_malloc(sizeof(SRP_VBASE)); | |
| 247 | |
| 248 if (vb == NULL) | |
| 249 return NULL; | |
| 250 if (!(vb->users_pwd = sk_SRP_user_pwd_new_null()) || | |
| 251 !(vb->gN_cache = sk_SRP_gN_cache_new_null())) | |
| 252 { | |
| 253 OPENSSL_free(vb); | |
| 254 return NULL; | |
| 255 } | |
| 256 vb->default_g = NULL; | |
| 257 vb->default_N = NULL; | |
| 258 vb->seed_key = NULL; | |
| 259 if ((seed_key != NULL) && | |
| 260 (vb->seed_key = BUF_strdup(seed_key)) == NULL) | |
| 261 { | |
| 262 sk_SRP_user_pwd_free(vb->users_pwd); | |
| 263 sk_SRP_gN_cache_free(vb->gN_cache); | |
| 264 OPENSSL_free(vb); | |
| 265 return NULL; | |
| 266 } | |
| 267 return vb; | |
| 268 } | |
| 269 | |
| 270 | |
| 271 int SRP_VBASE_free(SRP_VBASE *vb) | |
| 272 { | |
| 273 sk_SRP_user_pwd_pop_free(vb->users_pwd,SRP_user_pwd_free); | |
| 274 sk_SRP_gN_cache_free(vb->gN_cache); | |
| 275 OPENSSL_free(vb->seed_key); | |
| 276 OPENSSL_free(vb); | |
| 277 return 0; | |
| 278 } | |
| 279 | |
| 280 | |
| 281 static SRP_gN_cache *SRP_gN_new_init(const char *ch) | |
| 282 { | |
| 283 unsigned char tmp[MAX_LEN]; | |
| 284 int len; | |
| 285 | |
| 286 SRP_gN_cache *newgN = (SRP_gN_cache *)OPENSSL_malloc(sizeof(SRP_gN_cache
)); | |
| 287 if (newgN == NULL) | |
| 288 return NULL; | |
| 289 | |
| 290 if ((newgN->b64_bn = BUF_strdup(ch)) == NULL) | |
| 291 goto err; | |
| 292 | |
| 293 len = t_fromb64(tmp, ch); | |
| 294 if ((newgN->bn = BN_bin2bn(tmp, len, NULL))) | |
| 295 return newgN; | |
| 296 | |
| 297 OPENSSL_free(newgN->b64_bn); | |
| 298 err: | |
| 299 OPENSSL_free(newgN); | |
| 300 return NULL; | |
| 301 } | |
| 302 | |
| 303 | |
| 304 static void SRP_gN_free(SRP_gN_cache *gN_cache) | |
| 305 { | |
| 306 if (gN_cache == NULL) | |
| 307 return; | |
| 308 OPENSSL_free(gN_cache->b64_bn); | |
| 309 BN_free(gN_cache->bn); | |
| 310 OPENSSL_free(gN_cache); | |
| 311 } | |
| 312 | |
| 313 static SRP_gN *SRP_get_gN_by_id(const char *id, STACK_OF(SRP_gN) *gN_tab) | |
| 314 { | |
| 315 int i; | |
| 316 | |
| 317 SRP_gN *gN; | |
| 318 if (gN_tab != NULL) | |
| 319 for(i = 0; i < sk_SRP_gN_num(gN_tab); i++) | |
| 320 { | |
| 321 gN = sk_SRP_gN_value(gN_tab, i); | |
| 322 if (gN && (id == NULL || strcmp(gN->id,id)==0)) | |
| 323 return gN; | |
| 324 } | |
| 325 | |
| 326 return SRP_get_default_gN(id); | |
| 327 } | |
| 328 | |
| 329 static BIGNUM *SRP_gN_place_bn(STACK_OF(SRP_gN_cache) *gN_cache, char *ch) | |
| 330 { | |
| 331 int i; | |
| 332 if (gN_cache == NULL) | |
| 333 return NULL; | |
| 334 | |
| 335 /* search if we have already one... */ | |
| 336 for(i = 0; i < sk_SRP_gN_cache_num(gN_cache); i++) | |
| 337 { | |
| 338 SRP_gN_cache *cache = sk_SRP_gN_cache_value(gN_cache, i); | |
| 339 if (strcmp(cache->b64_bn,ch)==0) | |
| 340 return cache->bn; | |
| 341 } | |
| 342 { /* it is the first time that we find it */ | |
| 343 SRP_gN_cache *newgN = SRP_gN_new_init(ch); | |
| 344 if (newgN) | |
| 345 { | |
| 346 if (sk_SRP_gN_cache_insert(gN_cache,newgN,0)>0) | |
| 347 return newgN->bn; | |
| 348 SRP_gN_free(newgN); | |
| 349 } | |
| 350 } | |
| 351 return NULL; | |
| 352 } | |
| 353 | |
| 354 /* this function parses verifier file. Format is: | |
| 355 * string(index):base64(N):base64(g):0 | |
| 356 * string(username):base64(v):base64(salt):int(index) | |
| 357 */ | |
| 358 | |
| 359 | |
| 360 int SRP_VBASE_init(SRP_VBASE *vb, char *verifier_file) | |
| 361 { | |
| 362 int error_code ; | |
| 363 STACK_OF(SRP_gN) *SRP_gN_tab = sk_SRP_gN_new_null(); | |
| 364 char *last_index = NULL; | |
| 365 int i; | |
| 366 char **pp; | |
| 367 | |
| 368 SRP_gN *gN = NULL; | |
| 369 SRP_user_pwd *user_pwd = NULL ; | |
| 370 | |
| 371 TXT_DB *tmpdb = NULL; | |
| 372 BIO *in = BIO_new(BIO_s_file()); | |
| 373 | |
| 374 error_code = SRP_ERR_OPEN_FILE; | |
| 375 | |
| 376 if (in == NULL || BIO_read_filename(in,verifier_file) <= 0) | |
| 377 goto err; | |
| 378 | |
| 379 error_code = SRP_ERR_VBASE_INCOMPLETE_FILE; | |
| 380 | |
| 381 if ((tmpdb =TXT_DB_read(in,DB_NUMBER)) == NULL) | |
| 382 goto err; | |
| 383 | |
| 384 error_code = SRP_ERR_MEMORY; | |
| 385 | |
| 386 | |
| 387 if (vb->seed_key) | |
| 388 { | |
| 389 last_index = SRP_get_default_gN(NULL)->id; | |
| 390 } | |
| 391 for (i = 0; i < sk_OPENSSL_PSTRING_num(tmpdb->data); i++) | |
| 392 { | |
| 393 pp = sk_OPENSSL_PSTRING_value(tmpdb->data,i); | |
| 394 if (pp[DB_srptype][0] == DB_SRP_INDEX) | |
| 395 { | |
| 396 /*we add this couple in the internal Stack */ | |
| 397 | |
| 398 if ((gN = (SRP_gN *)OPENSSL_malloc(sizeof(SRP_gN))) == N
ULL) | |
| 399 goto err; | |
| 400 | |
| 401 if (!(gN->id = BUF_strdup(pp[DB_srpid])) | |
| 402 || !(gN->N = SRP_gN_place_bn(vb->gN_cache,pp[DB_srpveri
fier])) | |
| 403 || !(gN->g = SRP_gN_place_bn(vb->gN_cache,pp[DB_srpsalt
])) | |
| 404 || sk_SRP_gN_insert(SRP_gN_tab,gN,0) == 0) | |
| 405 goto err; | |
| 406 | |
| 407 gN = NULL; | |
| 408 | |
| 409 if (vb->seed_key != NULL) | |
| 410 { | |
| 411 last_index = pp[DB_srpid]; | |
| 412 } | |
| 413 } | |
| 414 else if (pp[DB_srptype][0] == DB_SRP_VALID) | |
| 415 { | |
| 416 /* it is a user .... */ | |
| 417 SRP_gN *lgN; | |
| 418 if ((lgN = SRP_get_gN_by_id(pp[DB_srpgN],SRP_gN_tab))!=N
ULL) | |
| 419 { | |
| 420 error_code = SRP_ERR_MEMORY; | |
| 421 if ((user_pwd = SRP_user_pwd_new()) == NULL) | |
| 422 goto err; | |
| 423 | |
| 424 SRP_user_pwd_set_gN(user_pwd,lgN->g,lgN->N); | |
| 425 if (!SRP_user_pwd_set_ids(user_pwd, pp[DB_srpid]
,pp[DB_srpinfo])) | |
| 426 goto err; | |
| 427 | |
| 428 error_code = SRP_ERR_VBASE_BN_LIB; | |
| 429 if (!SRP_user_pwd_set_sv(user_pwd, pp[DB_srpsalt
],pp[DB_srpverifier])) | |
| 430 goto err; | |
| 431 | |
| 432 if (sk_SRP_user_pwd_insert(vb->users_pwd, user_p
wd, 0) == 0) | |
| 433 goto err; | |
| 434 user_pwd = NULL; /* abandon responsability */ | |
| 435 } | |
| 436 } | |
| 437 } | |
| 438 | |
| 439 if (last_index != NULL) | |
| 440 { | |
| 441 /* this means that we want to simulate a default user */ | |
| 442 | |
| 443 if (((gN = SRP_get_gN_by_id(last_index,SRP_gN_tab))==NULL)) | |
| 444 { | |
| 445 error_code = SRP_ERR_VBASE_BN_LIB; | |
| 446 goto err; | |
| 447 } | |
| 448 vb->default_g = gN->g ; | |
| 449 vb->default_N = gN->N ; | |
| 450 gN = NULL ; | |
| 451 } | |
| 452 error_code = SRP_NO_ERROR; | |
| 453 | |
| 454 err: | |
| 455 /* there may be still some leaks to fix, if this fails, the application
terminates most likely */ | |
| 456 | |
| 457 if (gN != NULL) | |
| 458 { | |
| 459 OPENSSL_free(gN->id); | |
| 460 OPENSSL_free(gN); | |
| 461 } | |
| 462 | |
| 463 SRP_user_pwd_free(user_pwd); | |
| 464 | |
| 465 if (tmpdb) TXT_DB_free(tmpdb); | |
| 466 if (in) BIO_free_all(in); | |
| 467 | |
| 468 sk_SRP_gN_free(SRP_gN_tab); | |
| 469 | |
| 470 return error_code; | |
| 471 | |
| 472 } | |
| 473 | |
| 474 | |
| 475 SRP_user_pwd *SRP_VBASE_get_by_user(SRP_VBASE *vb, char *username) | |
| 476 { | |
| 477 int i; | |
| 478 SRP_user_pwd *user; | |
| 479 unsigned char digv[SHA_DIGEST_LENGTH]; | |
| 480 unsigned char digs[SHA_DIGEST_LENGTH]; | |
| 481 EVP_MD_CTX ctxt; | |
| 482 | |
| 483 if (vb == NULL) | |
| 484 return NULL; | |
| 485 for(i = 0; i < sk_SRP_user_pwd_num(vb->users_pwd); i++) | |
| 486 { | |
| 487 user = sk_SRP_user_pwd_value(vb->users_pwd, i); | |
| 488 if (strcmp(user->id,username)==0) | |
| 489 return user; | |
| 490 } | |
| 491 if ((vb->seed_key == NULL) || | |
| 492 (vb->default_g == NULL) || | |
| 493 (vb->default_N == NULL)) | |
| 494 return NULL; | |
| 495 | |
| 496 /* if the user is unknown we set parameters as well if we have a seed_key */ | |
| 497 | |
| 498 if ((user = SRP_user_pwd_new()) == NULL) | |
| 499 return NULL; | |
| 500 | |
| 501 SRP_user_pwd_set_gN(user,vb->default_g,vb->default_N); | |
| 502 | |
| 503 if (!SRP_user_pwd_set_ids(user,username,NULL)) | |
| 504 goto err; | |
| 505 | |
| 506 RAND_pseudo_bytes(digv, SHA_DIGEST_LENGTH); | |
| 507 EVP_MD_CTX_init(&ctxt); | |
| 508 EVP_DigestInit_ex(&ctxt, EVP_sha1(), NULL); | |
| 509 EVP_DigestUpdate(&ctxt, vb->seed_key, strlen(vb->seed_key)); | |
| 510 EVP_DigestUpdate(&ctxt, username, strlen(username)); | |
| 511 EVP_DigestFinal_ex(&ctxt, digs, NULL); | |
| 512 EVP_MD_CTX_cleanup(&ctxt); | |
| 513 if (SRP_user_pwd_set_sv_BN(user, BN_bin2bn(digs,SHA_DIGEST_LENGTH,NULL),
BN_bin2bn(digv,SHA_DIGEST_LENGTH, NULL))) | |
| 514 return user; | |
| 515 | |
| 516 err: SRP_user_pwd_free(user); | |
| 517 return NULL; | |
| 518 } | |
| 519 | |
| 520 | |
| 521 /* | |
| 522 create a verifier (*salt,*verifier,g and N are in base64) | |
| 523 */ | |
| 524 char *SRP_create_verifier(const char *user, const char *pass, char **salt, | |
| 525 char **verifier, const char *N, const char *g) | |
| 526 { | |
| 527 int len; | |
| 528 char * result=NULL; | |
| 529 char *vf; | |
| 530 BIGNUM *N_bn = NULL, *g_bn = NULL, *s = NULL, *v = NULL; | |
| 531 unsigned char tmp[MAX_LEN]; | |
| 532 unsigned char tmp2[MAX_LEN]; | |
| 533 char * defgNid = NULL; | |
| 534 | |
| 535 if ((user == NULL)|| | |
| 536 (pass == NULL)|| | |
| 537 (salt == NULL)|| | |
| 538 (verifier == NULL)) | |
| 539 goto err; | |
| 540 | |
| 541 if (N) | |
| 542 { | |
| 543 if (!(len = t_fromb64(tmp, N))) goto err; | |
| 544 N_bn = BN_bin2bn(tmp, len, NULL); | |
| 545 if (!(len = t_fromb64(tmp, g))) goto err; | |
| 546 g_bn = BN_bin2bn(tmp, len, NULL); | |
| 547 defgNid = "*"; | |
| 548 } | |
| 549 else | |
| 550 { | |
| 551 SRP_gN * gN = SRP_get_gN_by_id(g, NULL) ; | |
| 552 if (gN == NULL) | |
| 553 goto err; | |
| 554 N_bn = gN->N; | |
| 555 g_bn = gN->g; | |
| 556 defgNid = gN->id; | |
| 557 } | |
| 558 | |
| 559 if (*salt == NULL) | |
| 560 { | |
| 561 RAND_pseudo_bytes(tmp2, SRP_RANDOM_SALT_LEN); | |
| 562 | |
| 563 s = BN_bin2bn(tmp2, SRP_RANDOM_SALT_LEN, NULL); | |
| 564 } | |
| 565 else | |
| 566 { | |
| 567 if (!(len = t_fromb64(tmp2, *salt))) | |
| 568 goto err; | |
| 569 s = BN_bin2bn(tmp2, len, NULL); | |
| 570 } | |
| 571 | |
| 572 | |
| 573 if(!SRP_create_verifier_BN(user, pass, &s, &v, N_bn, g_bn)) goto err; | |
| 574 | |
| 575 BN_bn2bin(v,tmp); | |
| 576 if (((vf = OPENSSL_malloc(BN_num_bytes(v)*2)) == NULL)) | |
| 577 goto err; | |
| 578 t_tob64(vf, tmp, BN_num_bytes(v)); | |
| 579 | |
| 580 *verifier = vf; | |
| 581 if (*salt == NULL) | |
| 582 { | |
| 583 char *tmp_salt; | |
| 584 | |
| 585 if ((tmp_salt = OPENSSL_malloc(SRP_RANDOM_SALT_LEN * 2)) == NULL
) | |
| 586 { | |
| 587 OPENSSL_free(vf); | |
| 588 goto err; | |
| 589 } | |
| 590 t_tob64(tmp_salt, tmp2, SRP_RANDOM_SALT_LEN); | |
| 591 *salt = tmp_salt; | |
| 592 } | |
| 593 | |
| 594 result=defgNid; | |
| 595 | |
| 596 err: | |
| 597 if(N) | |
| 598 { | |
| 599 BN_free(N_bn); | |
| 600 BN_free(g_bn); | |
| 601 } | |
| 602 return result; | |
| 603 } | |
| 604 | |
| 605 /* | |
| 606 create a verifier (*salt,*verifier,g and N are BIGNUMs) | |
| 607 */ | |
| 608 int SRP_create_verifier_BN(const char *user, const char *pass, BIGNUM **salt, BI
GNUM **verifier, BIGNUM *N, BIGNUM *g) | |
| 609 { | |
| 610 int result=0; | |
| 611 BIGNUM *x = NULL; | |
| 612 BN_CTX *bn_ctx = BN_CTX_new(); | |
| 613 unsigned char tmp2[MAX_LEN]; | |
| 614 | |
| 615 if ((user == NULL)|| | |
| 616 (pass == NULL)|| | |
| 617 (salt == NULL)|| | |
| 618 (verifier == NULL)|| | |
| 619 (N == NULL)|| | |
| 620 (g == NULL)|| | |
| 621 (bn_ctx == NULL)) | |
| 622 goto err; | |
| 623 | |
| 624 srp_bn_print(N); | |
| 625 srp_bn_print(g); | |
| 626 | |
| 627 if (*salt == NULL) | |
| 628 { | |
| 629 RAND_pseudo_bytes(tmp2, SRP_RANDOM_SALT_LEN); | |
| 630 | |
| 631 *salt = BN_bin2bn(tmp2,SRP_RANDOM_SALT_LEN,NULL); | |
| 632 } | |
| 633 | |
| 634 x = SRP_Calc_x(*salt,user,pass); | |
| 635 | |
| 636 *verifier = BN_new(); | |
| 637 if(*verifier == NULL) goto err; | |
| 638 | |
| 639 if (!BN_mod_exp(*verifier,g,x,N,bn_ctx)) | |
| 640 { | |
| 641 BN_clear_free(*verifier); | |
| 642 goto err; | |
| 643 } | |
| 644 | |
| 645 srp_bn_print(*verifier); | |
| 646 | |
| 647 result=1; | |
| 648 | |
| 649 err: | |
| 650 | |
| 651 BN_clear_free(x); | |
| 652 BN_CTX_free(bn_ctx); | |
| 653 return result; | |
| 654 } | |
| 655 | |
| 656 | |
| 657 | |
| 658 #endif | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master