1 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL 2 * project 2006. 3 */ 4 /* ==================================================================== 5 * Copyright (c) 2006 The OpenSSL Project. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 19 * 3. All advertising materials mentioning features or use of this 20 * software must display the following acknowledgment: 21 * "This product includes software developed by the OpenSSL Project 22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 23 * 24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 25 * endorse or promote products derived from this software without 26 * prior written permission. For written permission, please contact 27 * licensing (at) OpenSSL.org. 28 * 29 * 5. Products derived from this software may not be called "OpenSSL" 30 * nor may "OpenSSL" appear in their names without prior written 31 * permission of the OpenSSL Project. 32 * 33 * 6. Redistributions of any form whatsoever must retain the following 34 * acknowledgment: 35 * "This product includes software developed by the OpenSSL Project 36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 49 * OF THE POSSIBILITY OF SUCH DAMAGE. 50 * ==================================================================== 51 * 52 * This product includes cryptographic software written by Eric Young 53 * (eay (at) cryptsoft.com). This product includes software written by Tim 54 * Hudson (tjh (at) cryptsoft.com). */ 55 56 #include <openssl/evp.h> 57 58 #include <openssl/asn1.h> 59 #include <openssl/asn1t.h> 60 #include <openssl/bytestring.h> 61 #include <openssl/digest.h> 62 #include <openssl/err.h> 63 #include <openssl/mem.h> 64 #include <openssl/obj.h> 65 #include <openssl/rsa.h> 66 #include <openssl/x509.h> 67 68 #include "../rsa/internal.h" 69 #include "internal.h" 70 71 72 static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) { 73 uint8_t *encoded; 74 size_t encoded_len; 75 if (!RSA_public_key_to_bytes(&encoded, &encoded_len, pkey->pkey.rsa)) { 76 return 0; 77 } 78 79 if (!X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_RSA), V_ASN1_NULL, NULL, 80 encoded, encoded_len)) { 81 OPENSSL_free(encoded); 82 return 0; 83 } 84 85 return 1; 86 } 87 88 static int rsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) { 89 const uint8_t *p; 90 int pklen; 91 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, NULL, pubkey)) { 92 return 0; 93 } 94 95 /* Estonian IDs issued between September 2014 to September 2015 are 96 * broken. See https://crbug.com/532048 and https://crbug.com/534766. 97 * 98 * TODO(davidben): Switch this to the strict version in March 2016 or when 99 * Chromium can force client certificates down a different codepath, whichever 100 * comes first. */ 101 CBS cbs; 102 CBS_init(&cbs, p, pklen); 103 RSA *rsa = RSA_parse_public_key_buggy(&cbs); 104 if (rsa == NULL || CBS_len(&cbs) != 0) { 105 OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR); 106 RSA_free(rsa); 107 return 0; 108 } 109 110 EVP_PKEY_assign_RSA(pkey, rsa); 111 return 1; 112 } 113 114 static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) { 115 return BN_cmp(b->pkey.rsa->n, a->pkey.rsa->n) == 0 && 116 BN_cmp(b->pkey.rsa->e, a->pkey.rsa->e) == 0; 117 } 118 119 static int rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) { 120 uint8_t *encoded; 121 size_t encoded_len; 122 if (!RSA_private_key_to_bytes(&encoded, &encoded_len, pkey->pkey.rsa)) { 123 return 0; 124 } 125 126 /* TODO(fork): const correctness in next line. */ 127 if (!PKCS8_pkey_set0(p8, (ASN1_OBJECT *)OBJ_nid2obj(NID_rsaEncryption), 0, 128 V_ASN1_NULL, NULL, encoded, encoded_len)) { 129 OPENSSL_free(encoded); 130 OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE); 131 return 0; 132 } 133 134 return 1; 135 } 136 137 static int rsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8) { 138 const uint8_t *p; 139 int pklen; 140 if (!PKCS8_pkey_get0(NULL, &p, &pklen, NULL, p8)) { 141 OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE); 142 return 0; 143 } 144 145 RSA *rsa = RSA_private_key_from_bytes(p, pklen); 146 if (rsa == NULL) { 147 OPENSSL_PUT_ERROR(EVP, ERR_R_RSA_LIB); 148 return 0; 149 } 150 151 EVP_PKEY_assign_RSA(pkey, rsa); 152 return 1; 153 } 154 155 static int rsa_opaque(const EVP_PKEY *pkey) { 156 return RSA_is_opaque(pkey->pkey.rsa); 157 } 158 159 static int rsa_supports_digest(const EVP_PKEY *pkey, const EVP_MD *md) { 160 return RSA_supports_digest(pkey->pkey.rsa, md); 161 } 162 163 static int int_rsa_size(const EVP_PKEY *pkey) { 164 return RSA_size(pkey->pkey.rsa); 165 } 166 167 static int rsa_bits(const EVP_PKEY *pkey) { 168 return BN_num_bits(pkey->pkey.rsa->n); 169 } 170 171 static void int_rsa_free(EVP_PKEY *pkey) { RSA_free(pkey->pkey.rsa); } 172 173 static void update_buflen(const BIGNUM *b, size_t *pbuflen) { 174 size_t i; 175 176 if (!b) { 177 return; 178 } 179 180 i = BN_num_bytes(b); 181 if (*pbuflen < i) { 182 *pbuflen = i; 183 } 184 } 185 186 static int do_rsa_print(BIO *out, const RSA *rsa, int off, 187 int include_private) { 188 char *str; 189 const char *s; 190 uint8_t *m = NULL; 191 int ret = 0, mod_len = 0; 192 size_t buf_len = 0; 193 194 update_buflen(rsa->n, &buf_len); 195 update_buflen(rsa->e, &buf_len); 196 197 if (include_private) { 198 update_buflen(rsa->d, &buf_len); 199 update_buflen(rsa->p, &buf_len); 200 update_buflen(rsa->q, &buf_len); 201 update_buflen(rsa->dmp1, &buf_len); 202 update_buflen(rsa->dmq1, &buf_len); 203 update_buflen(rsa->iqmp, &buf_len); 204 205 if (rsa->additional_primes != NULL) { 206 size_t i; 207 208 for (i = 0; i < sk_RSA_additional_prime_num(rsa->additional_primes); 209 i++) { 210 const RSA_additional_prime *ap = 211 sk_RSA_additional_prime_value(rsa->additional_primes, i); 212 update_buflen(ap->prime, &buf_len); 213 update_buflen(ap->exp, &buf_len); 214 update_buflen(ap->coeff, &buf_len); 215 } 216 } 217 } 218 219 m = (uint8_t *)OPENSSL_malloc(buf_len + 10); 220 if (m == NULL) { 221 OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE); 222 goto err; 223 } 224 225 if (rsa->n != NULL) { 226 mod_len = BN_num_bits(rsa->n); 227 } 228 229 if (!BIO_indent(out, off, 128)) { 230 goto err; 231 } 232 233 if (include_private && rsa->d) { 234 if (BIO_printf(out, "Private-Key: (%d bit)\n", mod_len) <= 0) { 235 goto err; 236 } 237 str = "modulus:"; 238 s = "publicExponent:"; 239 } else { 240 if (BIO_printf(out, "Public-Key: (%d bit)\n", mod_len) <= 0) { 241 goto err; 242 } 243 str = "Modulus:"; 244 s = "Exponent:"; 245 } 246 if (!ASN1_bn_print(out, str, rsa->n, m, off) || 247 !ASN1_bn_print(out, s, rsa->e, m, off)) { 248 goto err; 249 } 250 251 if (include_private) { 252 if (!ASN1_bn_print(out, "privateExponent:", rsa->d, m, off) || 253 !ASN1_bn_print(out, "prime1:", rsa->p, m, off) || 254 !ASN1_bn_print(out, "prime2:", rsa->q, m, off) || 255 !ASN1_bn_print(out, "exponent1:", rsa->dmp1, m, off) || 256 !ASN1_bn_print(out, "exponent2:", rsa->dmq1, m, off) || 257 !ASN1_bn_print(out, "coefficient:", rsa->iqmp, m, off)) { 258 goto err; 259 } 260 261 if (rsa->additional_primes != NULL && 262 sk_RSA_additional_prime_num(rsa->additional_primes) > 0) { 263 size_t i; 264 265 if (BIO_printf(out, "otherPrimeInfos:\n") <= 0) { 266 goto err; 267 } 268 for (i = 0; i < sk_RSA_additional_prime_num(rsa->additional_primes); 269 i++) { 270 const RSA_additional_prime *ap = 271 sk_RSA_additional_prime_value(rsa->additional_primes, i); 272 273 if (BIO_printf(out, "otherPrimeInfo (prime %u):\n", 274 (unsigned)(i + 3)) <= 0 || 275 !ASN1_bn_print(out, "prime:", ap->prime, m, off) || 276 !ASN1_bn_print(out, "exponent:", ap->exp, m, off) || 277 !ASN1_bn_print(out, "coeff:", ap->coeff, m, off)) { 278 goto err; 279 } 280 } 281 } 282 } 283 ret = 1; 284 285 err: 286 OPENSSL_free(m); 287 return ret; 288 } 289 290 static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent, 291 ASN1_PCTX *ctx) { 292 return do_rsa_print(bp, pkey->pkey.rsa, indent, 0); 293 } 294 295 296 static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent, 297 ASN1_PCTX *ctx) { 298 return do_rsa_print(bp, pkey->pkey.rsa, indent, 1); 299 } 300 301 /* Given an MGF1 Algorithm ID decode to an Algorithm Identifier */ 302 static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg) { 303 const uint8_t *p; 304 int plen; 305 306 if (alg == NULL || alg->parameter == NULL || 307 OBJ_obj2nid(alg->algorithm) != NID_mgf1 || 308 alg->parameter->type != V_ASN1_SEQUENCE) { 309 return NULL; 310 } 311 312 p = alg->parameter->value.sequence->data; 313 plen = alg->parameter->value.sequence->length; 314 return d2i_X509_ALGOR(NULL, &p, plen); 315 } 316 317 static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg, 318 X509_ALGOR **pmaskHash) { 319 const uint8_t *p; 320 int plen; 321 RSA_PSS_PARAMS *pss; 322 323 *pmaskHash = NULL; 324 325 if (!alg->parameter || alg->parameter->type != V_ASN1_SEQUENCE) { 326 return NULL; 327 } 328 p = alg->parameter->value.sequence->data; 329 plen = alg->parameter->value.sequence->length; 330 pss = d2i_RSA_PSS_PARAMS(NULL, &p, plen); 331 332 if (!pss) { 333 return NULL; 334 } 335 336 *pmaskHash = rsa_mgf1_decode(pss->maskGenAlgorithm); 337 338 return pss; 339 } 340 341 static int rsa_pss_param_print(BIO *bp, RSA_PSS_PARAMS *pss, 342 X509_ALGOR *maskHash, int indent) { 343 int rv = 0; 344 345 if (!pss) { 346 if (BIO_puts(bp, " (INVALID PSS PARAMETERS)\n") <= 0) { 347 return 0; 348 } 349 return 1; 350 } 351 352 if (BIO_puts(bp, "\n") <= 0 || 353 !BIO_indent(bp, indent, 128) || 354 BIO_puts(bp, "Hash Algorithm: ") <= 0) { 355 goto err; 356 } 357 358 if (pss->hashAlgorithm) { 359 if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0) { 360 goto err; 361 } 362 } else if (BIO_puts(bp, "sha1 (default)") <= 0) { 363 goto err; 364 } 365 366 if (BIO_puts(bp, "\n") <= 0 || 367 !BIO_indent(bp, indent, 128) || 368 BIO_puts(bp, "Mask Algorithm: ") <= 0) { 369 goto err; 370 } 371 372 if (pss->maskGenAlgorithm) { 373 if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0 || 374 BIO_puts(bp, " with ") <= 0) { 375 goto err; 376 } 377 378 if (maskHash) { 379 if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0) { 380 goto err; 381 } 382 } else if (BIO_puts(bp, "INVALID") <= 0) { 383 goto err; 384 } 385 } else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0) { 386 goto err; 387 } 388 BIO_puts(bp, "\n"); 389 390 if (!BIO_indent(bp, indent, 128) || 391 BIO_puts(bp, "Salt Length: 0x") <= 0) { 392 goto err; 393 } 394 395 if (pss->saltLength) { 396 if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0) { 397 goto err; 398 } 399 } else if (BIO_puts(bp, "14 (default)") <= 0) { 400 goto err; 401 } 402 BIO_puts(bp, "\n"); 403 404 if (!BIO_indent(bp, indent, 128) || 405 BIO_puts(bp, "Trailer Field: 0x") <= 0) { 406 goto err; 407 } 408 409 if (pss->trailerField) { 410 if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0) { 411 goto err; 412 } 413 } else if (BIO_puts(bp, "BC (default)") <= 0) { 414 goto err; 415 } 416 BIO_puts(bp, "\n"); 417 418 rv = 1; 419 420 err: 421 return rv; 422 } 423 424 static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg, 425 const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx) { 426 if (OBJ_obj2nid(sigalg->algorithm) == NID_rsassaPss) { 427 int rv; 428 RSA_PSS_PARAMS *pss; 429 X509_ALGOR *maskHash; 430 431 pss = rsa_pss_decode(sigalg, &maskHash); 432 rv = rsa_pss_param_print(bp, pss, maskHash, indent); 433 RSA_PSS_PARAMS_free(pss); 434 X509_ALGOR_free(maskHash); 435 if (!rv) { 436 return 0; 437 } 438 } else if (!sig && BIO_puts(bp, "\n") <= 0) { 439 return 0; 440 } 441 442 if (sig) { 443 return X509_signature_dump(bp, sig, indent); 444 } 445 return 1; 446 } 447 448 static int old_rsa_priv_decode(EVP_PKEY *pkey, const uint8_t **pder, 449 int derlen) { 450 RSA *rsa = d2i_RSAPrivateKey(NULL, pder, derlen); 451 if (rsa == NULL) { 452 OPENSSL_PUT_ERROR(EVP, ERR_R_RSA_LIB); 453 return 0; 454 } 455 EVP_PKEY_assign_RSA(pkey, rsa); 456 return 1; 457 } 458 459 static int old_rsa_priv_encode(const EVP_PKEY *pkey, uint8_t **pder) { 460 return i2d_RSAPrivateKey(pkey->pkey.rsa, pder); 461 } 462 463 /* allocate and set algorithm ID from EVP_MD, default SHA1 */ 464 static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md) { 465 if (EVP_MD_type(md) == NID_sha1) { 466 return 1; 467 } 468 *palg = X509_ALGOR_new(); 469 if (!*palg) { 470 return 0; 471 } 472 X509_ALGOR_set_md(*palg, md); 473 return 1; 474 } 475 476 /* Allocate and set MGF1 algorithm ID from EVP_MD */ 477 static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md) { 478 X509_ALGOR *algtmp = NULL; 479 ASN1_STRING *stmp = NULL; 480 *palg = NULL; 481 482 if (EVP_MD_type(mgf1md) == NID_sha1) { 483 return 1; 484 } 485 /* need to embed algorithm ID inside another */ 486 if (!rsa_md_to_algor(&algtmp, mgf1md) || 487 !ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp)) { 488 goto err; 489 } 490 *palg = X509_ALGOR_new(); 491 if (!*palg) { 492 goto err; 493 } 494 X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp); 495 stmp = NULL; 496 497 err: 498 ASN1_STRING_free(stmp); 499 X509_ALGOR_free(algtmp); 500 if (*palg) { 501 return 1; 502 } 503 504 return 0; 505 } 506 507 /* convert algorithm ID to EVP_MD, default SHA1 */ 508 static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg) { 509 const EVP_MD *md; 510 if (!alg) { 511 return EVP_sha1(); 512 } 513 md = EVP_get_digestbyobj(alg->algorithm); 514 if (md == NULL) { 515 OPENSSL_PUT_ERROR(EVP, EVP_R_UNKNOWN_DIGEST); 516 } 517 return md; 518 } 519 520 /* convert MGF1 algorithm ID to EVP_MD, default SHA1 */ 521 static const EVP_MD *rsa_mgf1_to_md(X509_ALGOR *alg, X509_ALGOR *maskHash) { 522 const EVP_MD *md; 523 if (!alg) { 524 return EVP_sha1(); 525 } 526 /* Check mask and lookup mask hash algorithm */ 527 if (OBJ_obj2nid(alg->algorithm) != NID_mgf1) { 528 OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_MASK_ALGORITHM); 529 return NULL; 530 } 531 if (!maskHash) { 532 OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_MASK_PARAMETER); 533 return NULL; 534 } 535 md = EVP_get_digestbyobj(maskHash->algorithm); 536 if (md == NULL) { 537 OPENSSL_PUT_ERROR(EVP, EVP_R_UNKNOWN_MASK_DIGEST); 538 return NULL; 539 } 540 return md; 541 } 542 543 /* rsa_ctx_to_pss converts EVP_PKEY_CTX in PSS mode into corresponding 544 * algorithm parameter, suitable for setting as an AlgorithmIdentifier. */ 545 static ASN1_STRING *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx) { 546 const EVP_MD *sigmd, *mgf1md; 547 RSA_PSS_PARAMS *pss = NULL; 548 ASN1_STRING *os = NULL; 549 EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx); 550 int saltlen, rv = 0; 551 552 if (!EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) || 553 !EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) || 554 !EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen)) { 555 goto err; 556 } 557 558 if (saltlen == -1) { 559 saltlen = EVP_MD_size(sigmd); 560 } else if (saltlen == -2) { 561 saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2; 562 if (((EVP_PKEY_bits(pk) - 1) & 0x7) == 0) { 563 saltlen--; 564 } 565 } else { 566 goto err; 567 } 568 569 pss = RSA_PSS_PARAMS_new(); 570 if (!pss) { 571 goto err; 572 } 573 574 if (saltlen != 20) { 575 pss->saltLength = ASN1_INTEGER_new(); 576 if (!pss->saltLength || 577 !ASN1_INTEGER_set(pss->saltLength, saltlen)) { 578 goto err; 579 } 580 } 581 582 if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd) || 583 !rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md)) { 584 goto err; 585 } 586 587 /* Finally create string with pss parameter encoding. */ 588 if (!ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), &os)) { 589 goto err; 590 } 591 rv = 1; 592 593 err: 594 if (pss) { 595 RSA_PSS_PARAMS_free(pss); 596 } 597 if (rv) { 598 return os; 599 } 600 if (os) { 601 ASN1_STRING_free(os); 602 } 603 return NULL; 604 } 605 606 /* From PSS AlgorithmIdentifier set public key parameters. */ 607 static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, X509_ALGOR *sigalg, EVP_PKEY *pkey) { 608 int ret = 0; 609 int saltlen; 610 const EVP_MD *mgf1md = NULL, *md = NULL; 611 RSA_PSS_PARAMS *pss; 612 X509_ALGOR *maskHash; 613 EVP_PKEY_CTX *pkctx; 614 615 /* Sanity check: make sure it is PSS */ 616 if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss) { 617 OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_SIGNATURE_TYPE); 618 return 0; 619 } 620 /* Decode PSS parameters */ 621 pss = rsa_pss_decode(sigalg, &maskHash); 622 if (pss == NULL) { 623 OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_PSS_PARAMETERS); 624 goto err; 625 } 626 627 mgf1md = rsa_mgf1_to_md(pss->maskGenAlgorithm, maskHash); 628 if (!mgf1md) { 629 goto err; 630 } 631 md = rsa_algor_to_md(pss->hashAlgorithm); 632 if (!md) { 633 goto err; 634 } 635 636 saltlen = 20; 637 if (pss->saltLength) { 638 saltlen = ASN1_INTEGER_get(pss->saltLength); 639 640 /* Could perform more salt length sanity checks but the main 641 * RSA routines will trap other invalid values anyway. */ 642 if (saltlen < 0) { 643 OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_SALT_LENGTH); 644 goto err; 645 } 646 } 647 648 /* low-level routines support only trailer field 0xbc (value 1) 649 * and PKCS#1 says we should reject any other value anyway. */ 650 if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) { 651 OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_TRAILER); 652 goto err; 653 } 654 655 if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey) || 656 !EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) || 657 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) || 658 !EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md)) { 659 goto err; 660 } 661 662 ret = 1; 663 664 err: 665 RSA_PSS_PARAMS_free(pss); 666 if (maskHash) { 667 X509_ALGOR_free(maskHash); 668 } 669 return ret; 670 } 671 672 /* Customised RSA AlgorithmIdentifier handling. This is called when a signature 673 * is encountered requiring special handling. We currently only handle PSS. */ 674 static int rsa_digest_verify_init_from_algorithm(EVP_MD_CTX *ctx, 675 X509_ALGOR *sigalg, 676 EVP_PKEY *pkey) { 677 /* Sanity check: make sure it is PSS */ 678 if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss) { 679 OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_SIGNATURE_TYPE); 680 return 0; 681 } 682 return rsa_pss_to_ctx(ctx, sigalg, pkey); 683 } 684 685 static evp_digest_sign_algorithm_result_t rsa_digest_sign_algorithm( 686 EVP_MD_CTX *ctx, X509_ALGOR *sigalg) { 687 int pad_mode; 688 EVP_PKEY_CTX *pkctx = ctx->pctx; 689 if (!EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode)) { 690 return EVP_DIGEST_SIGN_ALGORITHM_ERROR; 691 } 692 if (pad_mode == RSA_PKCS1_PSS_PADDING) { 693 ASN1_STRING *os1 = rsa_ctx_to_pss(pkctx); 694 if (!os1) { 695 return EVP_DIGEST_SIGN_ALGORITHM_ERROR; 696 } 697 X509_ALGOR_set0(sigalg, OBJ_nid2obj(NID_rsassaPss), V_ASN1_SEQUENCE, os1); 698 return EVP_DIGEST_SIGN_ALGORITHM_SUCCESS; 699 } 700 701 /* Other padding schemes use the default behavior. */ 702 return EVP_DIGEST_SIGN_ALGORITHM_DEFAULT; 703 } 704 705 const EVP_PKEY_ASN1_METHOD rsa_asn1_meth = { 706 EVP_PKEY_RSA, 707 EVP_PKEY_RSA, 708 ASN1_PKEY_SIGPARAM_NULL, 709 710 "RSA", 711 712 rsa_pub_decode, 713 rsa_pub_encode, 714 rsa_pub_cmp, 715 rsa_pub_print, 716 717 rsa_priv_decode, 718 rsa_priv_encode, 719 rsa_priv_print, 720 721 rsa_opaque, 722 rsa_supports_digest, 723 724 int_rsa_size, 725 rsa_bits, 726 727 0,0,0,0,0,0, 728 729 rsa_sig_print, 730 int_rsa_free, 731 732 old_rsa_priv_decode, 733 old_rsa_priv_encode, 734 735 rsa_digest_verify_init_from_algorithm, 736 rsa_digest_sign_algorithm, 737 }; 738
