1/* 2 * Copyright 2006-2022 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10#include <stdio.h> 11#include "internal/cryptlib.h" 12#include <openssl/evp.h> 13#include <openssl/objects.h> 14#include "crypto/evp.h" 15#include "internal/provider.h" 16#include "internal/numbers.h" /* includes SIZE_MAX */ 17#include "evp_local.h" 18 19#ifndef FIPS_MODULE 20 21static int update(EVP_MD_CTX *ctx, const void *data, size_t datalen) 22{ 23 ERR_raise(ERR_LIB_EVP, EVP_R_ONLY_ONESHOT_SUPPORTED); 24 return 0; 25} 26 27/* 28 * If we get the "NULL" md then the name comes back as "UNDEF". We want to use 29 * NULL for this. 30 */ 31static const char *canon_mdname(const char *mdname) 32{ 33 if (mdname != NULL && strcmp(mdname, "UNDEF") == 0) 34 return NULL; 35 36 return mdname; 37} 38 39static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 40 const EVP_MD *type, const char *mdname, 41 OSSL_LIB_CTX *libctx, const char *props, 42 ENGINE *e, EVP_PKEY *pkey, int ver, 43 const OSSL_PARAM params[]) 44{ 45 EVP_PKEY_CTX *locpctx = NULL; 46 EVP_SIGNATURE *signature = NULL; 47 EVP_KEYMGMT *tmp_keymgmt = NULL; 48 const OSSL_PROVIDER *tmp_prov = NULL; 49 const char *supported_sig = NULL; 50 char locmdname[80] = ""; /* 80 chars should be enough */ 51 void *provkey = NULL; 52 int ret, iter, reinit = 1; 53 54 if (ctx->algctx != NULL) { 55 if (!ossl_assert(ctx->digest != NULL)) { 56 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); 57 return 0; 58 } 59 if (ctx->digest->freectx != NULL) 60 ctx->digest->freectx(ctx->algctx); 61 ctx->algctx = NULL; 62 } 63 64 if (ctx->pctx == NULL) { 65 reinit = 0; 66 if (e == NULL) 67 ctx->pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, props); 68 else 69 ctx->pctx = EVP_PKEY_CTX_new(pkey, e); 70 } 71 if (ctx->pctx == NULL) 72 return 0; 73 74 locpctx = ctx->pctx; 75 ERR_set_mark(); 76 77 if (evp_pkey_ctx_is_legacy(locpctx)) 78 goto legacy; 79 80 /* do not reinitialize if pkey is set or operation is different */ 81 if (reinit 82 && (pkey != NULL 83 || locpctx->operation != (ver ? EVP_PKEY_OP_VERIFYCTX 84 : EVP_PKEY_OP_SIGNCTX) 85 || (signature = locpctx->op.sig.signature) == NULL 86 || locpctx->op.sig.algctx == NULL)) 87 reinit = 0; 88 89 if (props == NULL) 90 props = locpctx->propquery; 91 92 if (locpctx->pkey == NULL) { 93 ERR_clear_last_mark(); 94 ERR_raise(ERR_LIB_EVP, EVP_R_NO_KEY_SET); 95 goto err; 96 } 97 98 if (!reinit) { 99 evp_pkey_ctx_free_old_ops(locpctx); 100 } else { 101 if (mdname == NULL && type == NULL) 102 mdname = canon_mdname(EVP_MD_get0_name(ctx->reqdigest)); 103 goto reinitialize; 104 } 105 106 /* 107 * Try to derive the supported signature from |locpctx->keymgmt|. 108 */ 109 if (!ossl_assert(locpctx->pkey->keymgmt == NULL 110 || locpctx->pkey->keymgmt == locpctx->keymgmt)) { 111 ERR_clear_last_mark(); 112 ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR); 113 goto err; 114 } 115 supported_sig = evp_keymgmt_util_query_operation_name(locpctx->keymgmt, 116 OSSL_OP_SIGNATURE); 117 if (supported_sig == NULL) { 118 ERR_clear_last_mark(); 119 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); 120 goto err; 121 } 122 123 /* 124 * We perform two iterations: 125 * 126 * 1. Do the normal signature fetch, using the fetching data given by 127 * the EVP_PKEY_CTX. 128 * 2. Do the provider specific signature fetch, from the same provider 129 * as |ctx->keymgmt| 130 * 131 * We then try to fetch the keymgmt from the same provider as the 132 * signature, and try to export |ctx->pkey| to that keymgmt (when 133 * this keymgmt happens to be the same as |ctx->keymgmt|, the export 134 * is a no-op, but we call it anyway to not complicate the code even 135 * more). 136 * If the export call succeeds (returns a non-NULL provider key pointer), 137 * we're done and can perform the operation itself. If not, we perform 138 * the second iteration, or jump to legacy. 139 */ 140 for (iter = 1, provkey = NULL; iter < 3 && provkey == NULL; iter++) { 141 EVP_KEYMGMT *tmp_keymgmt_tofree = NULL; 142 143 /* 144 * If we're on the second iteration, free the results from the first. 145 * They are NULL on the first iteration, so no need to check what 146 * iteration we're on. 147 */ 148 EVP_SIGNATURE_free(signature); 149 EVP_KEYMGMT_free(tmp_keymgmt); 150 151 switch (iter) { 152 case 1: 153 signature = EVP_SIGNATURE_fetch(locpctx->libctx, supported_sig, 154 locpctx->propquery); 155 if (signature != NULL) 156 tmp_prov = EVP_SIGNATURE_get0_provider(signature); 157 break; 158 case 2: 159 tmp_prov = EVP_KEYMGMT_get0_provider(locpctx->keymgmt); 160 signature = 161 evp_signature_fetch_from_prov((OSSL_PROVIDER *)tmp_prov, 162 supported_sig, locpctx->propquery); 163 if (signature == NULL) 164 goto legacy; 165 break; 166 } 167 if (signature == NULL) 168 continue; 169 170 /* 171 * Ensure that the key is provided, either natively, or as a cached 172 * export. We start by fetching the keymgmt with the same name as 173 * |locpctx->pkey|, but from the provider of the signature method, using 174 * the same property query as when fetching the signature method. 175 * With the keymgmt we found (if we did), we try to export |locpctx->pkey| 176 * to it (evp_pkey_export_to_provider() is smart enough to only actually 177 178 * export it if |tmp_keymgmt| is different from |locpctx->pkey|'s keymgmt) 179 */ 180 tmp_keymgmt_tofree = tmp_keymgmt = 181 evp_keymgmt_fetch_from_prov((OSSL_PROVIDER *)tmp_prov, 182 EVP_KEYMGMT_get0_name(locpctx->keymgmt), 183 locpctx->propquery); 184 if (tmp_keymgmt != NULL) 185 provkey = evp_pkey_export_to_provider(locpctx->pkey, locpctx->libctx, 186 &tmp_keymgmt, locpctx->propquery); 187 if (tmp_keymgmt == NULL) 188 EVP_KEYMGMT_free(tmp_keymgmt_tofree); 189 } 190 191 if (provkey == NULL) { 192 EVP_SIGNATURE_free(signature); 193 ERR_clear_last_mark(); 194 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); 195 goto err; 196 } 197 198 ERR_pop_to_mark(); 199 200 /* No more legacy from here down to legacy: */ 201 202 locpctx->op.sig.signature = signature; 203 locpctx->operation = ver ? EVP_PKEY_OP_VERIFYCTX 204 : EVP_PKEY_OP_SIGNCTX; 205 locpctx->op.sig.algctx 206 = signature->newctx(ossl_provider_ctx(signature->prov), props); 207 if (locpctx->op.sig.algctx == NULL) { 208 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); 209 goto err; 210 } 211 212 reinitialize: 213 if (pctx != NULL) 214 *pctx = locpctx; 215 216 if (type != NULL) { 217 ctx->reqdigest = type; 218 if (mdname == NULL) 219 mdname = canon_mdname(EVP_MD_get0_name(type)); 220 } else { 221 if (mdname == NULL && !reinit) { 222 if (evp_keymgmt_util_get_deflt_digest_name(tmp_keymgmt, provkey, 223 locmdname, 224 sizeof(locmdname)) > 0) { 225 mdname = canon_mdname(locmdname); 226 } 227 } 228 229 if (mdname != NULL) { 230 /* 231 * We're about to get a new digest so clear anything associated with 232 * an old digest. 233 */ 234 evp_md_ctx_clear_digest(ctx, 1, 0); 235 236 /* legacy code support for engines */ 237 ERR_set_mark(); 238 /* 239 * This might be requested by a later call to EVP_MD_CTX_get0_md(). 240 * In that case the "explicit fetch" rules apply for that 241 * function (as per man pages), i.e. the ref count is not updated 242 * so the EVP_MD should not be used beyound the lifetime of the 243 * EVP_MD_CTX. 244 */ 245 ctx->fetched_digest = EVP_MD_fetch(locpctx->libctx, mdname, props); 246 if (ctx->fetched_digest != NULL) { 247 ctx->digest = ctx->reqdigest = ctx->fetched_digest; 248 } else { 249 /* legacy engine support : remove the mark when this is deleted */ 250 ctx->reqdigest = ctx->digest = EVP_get_digestbyname(mdname); 251 if (ctx->digest == NULL) { 252 (void)ERR_clear_last_mark(); 253 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); 254 goto err; 255 } 256 } 257 (void)ERR_pop_to_mark(); 258 } 259 } 260 261 if (ver) { 262 if (signature->digest_verify_init == NULL) { 263 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); 264 goto err; 265 } 266 ret = signature->digest_verify_init(locpctx->op.sig.algctx, 267 mdname, provkey, params); 268 } else { 269 if (signature->digest_sign_init == NULL) { 270 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); 271 goto err; 272 } 273 ret = signature->digest_sign_init(locpctx->op.sig.algctx, 274 mdname, provkey, params); 275 } 276 277 /* 278 * If the operation was not a success and no digest was found, an error 279 * needs to be raised. 280 */ 281 if (ret > 0 || mdname != NULL) 282 goto end; 283 if (type == NULL) /* This check is redundant but clarifies matters */ 284 ERR_raise(ERR_LIB_EVP, EVP_R_NO_DEFAULT_DIGEST); 285 286 err: 287 evp_pkey_ctx_free_old_ops(locpctx); 288 locpctx->operation = EVP_PKEY_OP_UNDEFINED; 289 EVP_KEYMGMT_free(tmp_keymgmt); 290 return 0; 291 292 legacy: 293 /* 294 * If we don't have the full support we need with provided methods, 295 * let's go see if legacy does. 296 */ 297 ERR_pop_to_mark(); 298 EVP_KEYMGMT_free(tmp_keymgmt); 299 tmp_keymgmt = NULL; 300 301 if (type == NULL && mdname != NULL) 302 type = evp_get_digestbyname_ex(locpctx->libctx, mdname); 303 304 if (ctx->pctx->pmeth == NULL) { 305 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE); 306 return 0; 307 } 308 309 if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) { 310 311 if (type == NULL) { 312 int def_nid; 313 if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0) 314 type = EVP_get_digestbynid(def_nid); 315 } 316 317 if (type == NULL) { 318 ERR_raise(ERR_LIB_EVP, EVP_R_NO_DEFAULT_DIGEST); 319 return 0; 320 } 321 } 322 323 if (ver) { 324 if (ctx->pctx->pmeth->verifyctx_init) { 325 if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0) 326 return 0; 327 ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX; 328 } else if (ctx->pctx->pmeth->digestverify != 0) { 329 ctx->pctx->operation = EVP_PKEY_OP_VERIFY; 330 ctx->update = update; 331 } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) { 332 return 0; 333 } 334 } else { 335 if (ctx->pctx->pmeth->signctx_init) { 336 if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0) 337 return 0; 338 ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX; 339 } else if (ctx->pctx->pmeth->digestsign != 0) { 340 ctx->pctx->operation = EVP_PKEY_OP_SIGN; 341 ctx->update = update; 342 } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) { 343 return 0; 344 } 345 } 346 if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0) 347 return 0; 348 if (pctx) 349 *pctx = ctx->pctx; 350 if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) 351 return 1; 352 if (!EVP_DigestInit_ex(ctx, type, e)) 353 return 0; 354 /* 355 * This indicates the current algorithm requires 356 * special treatment before hashing the tbs-message. 357 */ 358 ctx->pctx->flag_call_digest_custom = 0; 359 if (ctx->pctx->pmeth->digest_custom != NULL) 360 ctx->pctx->flag_call_digest_custom = 1; 361 362 ret = 1; 363 364 end: 365#ifndef FIPS_MODULE 366 if (ret > 0) 367 ret = evp_pkey_ctx_use_cached_data(locpctx); 368#endif 369 370 EVP_KEYMGMT_free(tmp_keymgmt); 371 return ret > 0 ? 1 : 0; 372} 373 374int EVP_DigestSignInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 375 const char *mdname, OSSL_LIB_CTX *libctx, 376 const char *props, EVP_PKEY *pkey, 377 const OSSL_PARAM params[]) 378{ 379 return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 0, 380 params); 381} 382 383int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 384 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) 385{ 386 return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 0, 387 NULL); 388} 389 390int EVP_DigestVerifyInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 391 const char *mdname, OSSL_LIB_CTX *libctx, 392 const char *props, EVP_PKEY *pkey, 393 const OSSL_PARAM params[]) 394{ 395 return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 1, 396 params); 397} 398 399int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 400 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) 401{ 402 return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 1, 403 NULL); 404} 405#endif /* FIPS_MDOE */ 406 407int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize) 408{ 409 EVP_PKEY_CTX *pctx = ctx->pctx; 410 411 if (pctx == NULL 412 || pctx->operation != EVP_PKEY_OP_SIGNCTX 413 || pctx->op.sig.algctx == NULL 414 || pctx->op.sig.signature == NULL) 415 goto legacy; 416 417 if (pctx->op.sig.signature->digest_sign_update == NULL) { 418 ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 419 return 0; 420 } 421 422 return pctx->op.sig.signature->digest_sign_update(pctx->op.sig.algctx, 423 data, dsize); 424 425 legacy: 426 if (pctx != NULL) { 427 /* do_sigver_init() checked that |digest_custom| is non-NULL */ 428 if (pctx->flag_call_digest_custom 429 && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx)) 430 return 0; 431 pctx->flag_call_digest_custom = 0; 432 } 433 434 return EVP_DigestUpdate(ctx, data, dsize); 435} 436 437int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize) 438{ 439 EVP_PKEY_CTX *pctx = ctx->pctx; 440 441 if (pctx == NULL 442 || pctx->operation != EVP_PKEY_OP_VERIFYCTX 443 || pctx->op.sig.algctx == NULL 444 || pctx->op.sig.signature == NULL) 445 goto legacy; 446 447 if (pctx->op.sig.signature->digest_verify_update == NULL) { 448 ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 449 return 0; 450 } 451 452 return pctx->op.sig.signature->digest_verify_update(pctx->op.sig.algctx, 453 data, dsize); 454 455 legacy: 456 if (pctx != NULL) { 457 /* do_sigver_init() checked that |digest_custom| is non-NULL */ 458 if (pctx->flag_call_digest_custom 459 && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx)) 460 return 0; 461 pctx->flag_call_digest_custom = 0; 462 } 463 464 return EVP_DigestUpdate(ctx, data, dsize); 465} 466 467#ifndef FIPS_MODULE 468int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, 469 size_t *siglen) 470{ 471 int sctx = 0, r = 0; 472 EVP_PKEY_CTX *dctx, *pctx = ctx->pctx; 473 474 if (pctx == NULL 475 || pctx->operation != EVP_PKEY_OP_SIGNCTX 476 || pctx->op.sig.algctx == NULL 477 || pctx->op.sig.signature == NULL) 478 goto legacy; 479 480 if (sigret == NULL || (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) != 0) 481 return pctx->op.sig.signature->digest_sign_final(pctx->op.sig.algctx, 482 sigret, siglen, 483 sigret == NULL ? 0 : *siglen); 484 dctx = EVP_PKEY_CTX_dup(pctx); 485 if (dctx == NULL) 486 return 0; 487 488 r = dctx->op.sig.signature->digest_sign_final(dctx->op.sig.algctx, 489 sigret, siglen, 490 *siglen); 491 EVP_PKEY_CTX_free(dctx); 492 return r; 493 494 legacy: 495 if (pctx == NULL || pctx->pmeth == NULL) { 496 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); 497 return 0; 498 } 499 500 /* do_sigver_init() checked that |digest_custom| is non-NULL */ 501 if (pctx->flag_call_digest_custom 502 && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx)) 503 return 0; 504 pctx->flag_call_digest_custom = 0; 505 506 if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) { 507 if (sigret == NULL) 508 return pctx->pmeth->signctx(pctx, sigret, siglen, ctx); 509 if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) 510 r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx); 511 else { 512 dctx = EVP_PKEY_CTX_dup(pctx); 513 if (dctx == NULL) 514 return 0; 515 r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx); 516 EVP_PKEY_CTX_free(dctx); 517 } 518 return r; 519 } 520 if (pctx->pmeth->signctx != NULL) 521 sctx = 1; 522 else 523 sctx = 0; 524 if (sigret != NULL) { 525 unsigned char md[EVP_MAX_MD_SIZE]; 526 unsigned int mdlen = 0; 527 528 if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) { 529 if (sctx) 530 r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx); 531 else 532 r = EVP_DigestFinal_ex(ctx, md, &mdlen); 533 } else { 534 EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new(); 535 536 if (tmp_ctx == NULL) 537 return 0; 538 if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) { 539 EVP_MD_CTX_free(tmp_ctx); 540 return 0; 541 } 542 if (sctx) 543 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx, 544 sigret, siglen, tmp_ctx); 545 else 546 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen); 547 EVP_MD_CTX_free(tmp_ctx); 548 } 549 if (sctx || !r) 550 return r; 551 if (EVP_PKEY_sign(pctx, sigret, siglen, md, mdlen) <= 0) 552 return 0; 553 } else { 554 if (sctx) { 555 if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0) 556 return 0; 557 } else { 558 int s = EVP_MD_get_size(ctx->digest); 559 560 if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0) 561 return 0; 562 } 563 } 564 return 1; 565} 566 567int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen, 568 const unsigned char *tbs, size_t tbslen) 569{ 570 EVP_PKEY_CTX *pctx = ctx->pctx; 571 572 if (pctx != NULL 573 && pctx->operation == EVP_PKEY_OP_SIGNCTX 574 && pctx->op.sig.algctx != NULL 575 && pctx->op.sig.signature != NULL) { 576 if (pctx->op.sig.signature->digest_sign != NULL) 577 return pctx->op.sig.signature->digest_sign(pctx->op.sig.algctx, 578 sigret, siglen, 579 sigret == NULL ? 0 : *siglen, 580 tbs, tbslen); 581 } else { 582 /* legacy */ 583 if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestsign != NULL) 584 return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen); 585 } 586 587 if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0) 588 return 0; 589 return EVP_DigestSignFinal(ctx, sigret, siglen); 590} 591 592int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig, 593 size_t siglen) 594{ 595 unsigned char md[EVP_MAX_MD_SIZE]; 596 int r = 0; 597 unsigned int mdlen = 0; 598 int vctx = 0; 599 EVP_PKEY_CTX *dctx, *pctx = ctx->pctx; 600 601 if (pctx == NULL 602 || pctx->operation != EVP_PKEY_OP_VERIFYCTX 603 || pctx->op.sig.algctx == NULL 604 || pctx->op.sig.signature == NULL) 605 goto legacy; 606 607 if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISE) != 0) 608 return pctx->op.sig.signature->digest_verify_final(pctx->op.sig.algctx, 609 sig, siglen); 610 dctx = EVP_PKEY_CTX_dup(pctx); 611 if (dctx == NULL) 612 return 0; 613 614 r = dctx->op.sig.signature->digest_verify_final(dctx->op.sig.algctx, 615 sig, siglen); 616 EVP_PKEY_CTX_free(dctx); 617 return r; 618 619 legacy: 620 if (pctx == NULL || pctx->pmeth == NULL) { 621 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); 622 return 0; 623 } 624 625 /* do_sigver_init() checked that |digest_custom| is non-NULL */ 626 if (pctx->flag_call_digest_custom 627 && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx)) 628 return 0; 629 pctx->flag_call_digest_custom = 0; 630 631 if (pctx->pmeth->verifyctx != NULL) 632 vctx = 1; 633 else 634 vctx = 0; 635 if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) { 636 if (vctx) 637 r = pctx->pmeth->verifyctx(pctx, sig, siglen, ctx); 638 else 639 r = EVP_DigestFinal_ex(ctx, md, &mdlen); 640 } else { 641 EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new(); 642 if (tmp_ctx == NULL) 643 return -1; 644 if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) { 645 EVP_MD_CTX_free(tmp_ctx); 646 return -1; 647 } 648 if (vctx) 649 r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx, 650 sig, siglen, tmp_ctx); 651 else 652 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen); 653 EVP_MD_CTX_free(tmp_ctx); 654 } 655 if (vctx || !r) 656 return r; 657 return EVP_PKEY_verify(pctx, sig, siglen, md, mdlen); 658} 659 660int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret, 661 size_t siglen, const unsigned char *tbs, size_t tbslen) 662{ 663 EVP_PKEY_CTX *pctx = ctx->pctx; 664 665 if (pctx != NULL 666 && pctx->operation == EVP_PKEY_OP_VERIFYCTX 667 && pctx->op.sig.algctx != NULL 668 && pctx->op.sig.signature != NULL) { 669 if (pctx->op.sig.signature->digest_verify != NULL) 670 return pctx->op.sig.signature->digest_verify(pctx->op.sig.algctx, 671 sigret, siglen, 672 tbs, tbslen); 673 } else { 674 /* legacy */ 675 if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestverify != NULL) 676 return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen); 677 } 678 679 if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0) 680 return -1; 681 return EVP_DigestVerifyFinal(ctx, sigret, siglen); 682} 683#endif /* FIPS_MODULE */ 684