1 /* 2 * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (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/asn1t.h> 13 #include <openssl/x509.h> 14 #include <openssl/bn.h> 15 #include <openssl/cms.h> 16 #include "internal/asn1_int.h" 17 #include "internal/evp_int.h" 18 #include "rsa_locl.h" 19 20 #ifndef OPENSSL_NO_CMS 21 static int rsa_cms_sign(CMS_SignerInfo *si); 22 static int rsa_cms_verify(CMS_SignerInfo *si); 23 static int rsa_cms_decrypt(CMS_RecipientInfo *ri); 24 static int rsa_cms_encrypt(CMS_RecipientInfo *ri); 25 #endif 26 27 static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg); 28 29 /* Set any parameters associated with pkey */ 30 static int rsa_param_encode(const EVP_PKEY *pkey, 31 ASN1_STRING **pstr, int *pstrtype) 32 { 33 const RSA *rsa = pkey->pkey.rsa; 34 35 *pstr = NULL; 36 /* If RSA it's just NULL type */ 37 if (pkey->ameth->pkey_id != EVP_PKEY_RSA_PSS) { 38 *pstrtype = V_ASN1_NULL; 39 return 1; 40 } 41 /* If no PSS parameters we omit parameters entirely */ 42 if (rsa->pss == NULL) { 43 *pstrtype = V_ASN1_UNDEF; 44 return 1; 45 } 46 /* Encode PSS parameters */ 47 if (ASN1_item_pack(rsa->pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), pstr) == NULL) 48 return 0; 49 50 *pstrtype = V_ASN1_SEQUENCE; 51 return 1; 52 } 53 /* Decode any parameters and set them in RSA structure */ 54 static int rsa_param_decode(RSA *rsa, const X509_ALGOR *alg) 55 { 56 const ASN1_OBJECT *algoid; 57 const void *algp; 58 int algptype; 59 60 X509_ALGOR_get0(&algoid, &algptype, &algp, alg); 61 if (OBJ_obj2nid(algoid) != EVP_PKEY_RSA_PSS) 62 return 1; 63 if (algptype == V_ASN1_UNDEF) 64 return 1; 65 if (algptype != V_ASN1_SEQUENCE) { 66 RSAerr(RSA_F_RSA_PARAM_DECODE, RSA_R_INVALID_PSS_PARAMETERS); 67 return 0; 68 } 69 rsa->pss = rsa_pss_decode(alg); 70 if (rsa->pss == NULL) 71 return 0; 72 return 1; 73 } 74 75 static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) 76 { 77 unsigned char *penc = NULL; 78 int penclen; 79 ASN1_STRING *str; 80 int strtype; 81 82 if (!rsa_param_encode(pkey, &str, &strtype)) 83 return 0; 84 penclen = i2d_RSAPublicKey(pkey->pkey.rsa, &penc); 85 if (penclen <= 0) 86 return 0; 87 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id), 88 strtype, str, penc, penclen)) 89 return 1; 90 91 OPENSSL_free(penc); 92 return 0; 93 } 94 95 static int rsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) 96 { 97 const unsigned char *p; 98 int pklen; 99 X509_ALGOR *alg; 100 RSA *rsa = NULL; 101 102 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &alg, pubkey)) 103 return 0; 104 if ((rsa = d2i_RSAPublicKey(NULL, &p, pklen)) == NULL) { 105 RSAerr(RSA_F_RSA_PUB_DECODE, ERR_R_RSA_LIB); 106 return 0; 107 } 108 if (!rsa_param_decode(rsa, alg)) { 109 RSA_free(rsa); 110 return 0; 111 } 112 if (!EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa)) { 113 RSA_free(rsa); 114 return 0; 115 } 116 return 1; 117 } 118 119 static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) 120 { 121 if (BN_cmp(b->pkey.rsa->n, a->pkey.rsa->n) != 0 122 || BN_cmp(b->pkey.rsa->e, a->pkey.rsa->e) != 0) 123 return 0; 124 return 1; 125 } 126 127 static int old_rsa_priv_decode(EVP_PKEY *pkey, 128 const unsigned char **pder, int derlen) 129 { 130 RSA *rsa; 131 132 if ((rsa = d2i_RSAPrivateKey(NULL, pder, derlen)) == NULL) { 133 RSAerr(RSA_F_OLD_RSA_PRIV_DECODE, ERR_R_RSA_LIB); 134 return 0; 135 } 136 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa); 137 return 1; 138 } 139 140 static int old_rsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder) 141 { 142 return i2d_RSAPrivateKey(pkey->pkey.rsa, pder); 143 } 144 145 static int rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) 146 { 147 unsigned char *rk = NULL; 148 int rklen; 149 ASN1_STRING *str; 150 int strtype; 151 152 if (!rsa_param_encode(pkey, &str, &strtype)) 153 return 0; 154 rklen = i2d_RSAPrivateKey(pkey->pkey.rsa, &rk); 155 156 if (rklen <= 0) { 157 RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE); 158 ASN1_STRING_free(str); 159 return 0; 160 } 161 162 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0, 163 strtype, str, rk, rklen)) { 164 RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE); 165 ASN1_STRING_free(str); 166 return 0; 167 } 168 169 return 1; 170 } 171 172 static int rsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8) 173 { 174 const unsigned char *p; 175 RSA *rsa; 176 int pklen; 177 const X509_ALGOR *alg; 178 179 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &alg, p8)) 180 return 0; 181 rsa = d2i_RSAPrivateKey(NULL, &p, pklen); 182 if (rsa == NULL) { 183 RSAerr(RSA_F_RSA_PRIV_DECODE, ERR_R_RSA_LIB); 184 return 0; 185 } 186 if (!rsa_param_decode(rsa, alg)) { 187 RSA_free(rsa); 188 return 0; 189 } 190 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa); 191 return 1; 192 } 193 194 static int int_rsa_size(const EVP_PKEY *pkey) 195 { 196 return RSA_size(pkey->pkey.rsa); 197 } 198 199 static int rsa_bits(const EVP_PKEY *pkey) 200 { 201 return BN_num_bits(pkey->pkey.rsa->n); 202 } 203 204 static int rsa_security_bits(const EVP_PKEY *pkey) 205 { 206 return RSA_security_bits(pkey->pkey.rsa); 207 } 208 209 static void int_rsa_free(EVP_PKEY *pkey) 210 { 211 RSA_free(pkey->pkey.rsa); 212 } 213 214 static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg) 215 { 216 if (OBJ_obj2nid(alg->algorithm) != NID_mgf1) 217 return NULL; 218 return ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR), 219 alg->parameter); 220 } 221 222 static int rsa_pss_param_print(BIO *bp, int pss_key, RSA_PSS_PARAMS *pss, 223 int indent) 224 { 225 int rv = 0; 226 X509_ALGOR *maskHash = NULL; 227 228 if (!BIO_indent(bp, indent, 128)) 229 goto err; 230 if (pss_key) { 231 if (pss == NULL) { 232 if (BIO_puts(bp, "No PSS parameter restrictions\n") <= 0) 233 return 0; 234 return 1; 235 } else { 236 if (BIO_puts(bp, "PSS parameter restrictions:") <= 0) 237 return 0; 238 } 239 } else if (pss == NULL) { 240 if (BIO_puts(bp,"(INVALID PSS PARAMETERS)\n") <= 0) 241 return 0; 242 return 1; 243 } 244 if (BIO_puts(bp, "\n") <= 0) 245 goto err; 246 if (pss_key) 247 indent += 2; 248 if (!BIO_indent(bp, indent, 128)) 249 goto err; 250 if (BIO_puts(bp, "Hash Algorithm: ") <= 0) 251 goto err; 252 253 if (pss->hashAlgorithm) { 254 if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0) 255 goto err; 256 } else if (BIO_puts(bp, "sha1 (default)") <= 0) { 257 goto err; 258 } 259 260 if (BIO_puts(bp, "\n") <= 0) 261 goto err; 262 263 if (!BIO_indent(bp, indent, 128)) 264 goto err; 265 266 if (BIO_puts(bp, "Mask Algorithm: ") <= 0) 267 goto err; 268 if (pss->maskGenAlgorithm) { 269 if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0) 270 goto err; 271 if (BIO_puts(bp, " with ") <= 0) 272 goto err; 273 maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm); 274 if (maskHash != NULL) { 275 if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0) 276 goto err; 277 } else if (BIO_puts(bp, "INVALID") <= 0) { 278 goto err; 279 } 280 } else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0) { 281 goto err; 282 } 283 BIO_puts(bp, "\n"); 284 285 if (!BIO_indent(bp, indent, 128)) 286 goto err; 287 if (BIO_printf(bp, "%s Salt Length: 0x", pss_key ? "Minimum" : "") <= 0) 288 goto err; 289 if (pss->saltLength) { 290 if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0) 291 goto err; 292 } else if (BIO_puts(bp, "14 (default)") <= 0) { 293 goto err; 294 } 295 BIO_puts(bp, "\n"); 296 297 if (!BIO_indent(bp, indent, 128)) 298 goto err; 299 if (BIO_puts(bp, "Trailer Field: 0x") <= 0) 300 goto err; 301 if (pss->trailerField) { 302 if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0) 303 goto err; 304 } else if (BIO_puts(bp, "BC (default)") <= 0) { 305 goto err; 306 } 307 BIO_puts(bp, "\n"); 308 309 rv = 1; 310 311 err: 312 X509_ALGOR_free(maskHash); 313 return rv; 314 315 } 316 317 static int pkey_rsa_print(BIO *bp, const EVP_PKEY *pkey, int off, int priv) 318 { 319 const RSA *x = pkey->pkey.rsa; 320 char *str; 321 const char *s; 322 int ret = 0, mod_len = 0, ex_primes; 323 324 if (x->n != NULL) 325 mod_len = BN_num_bits(x->n); 326 ex_primes = sk_RSA_PRIME_INFO_num(x->prime_infos); 327 328 if (!BIO_indent(bp, off, 128)) 329 goto err; 330 331 if (BIO_printf(bp, "%s ", pkey_is_pss(pkey) ? "RSA-PSS" : "RSA") <= 0) 332 goto err; 333 334 if (priv && x->d) { 335 if (BIO_printf(bp, "Private-Key: (%d bit, %d primes)\n", 336 mod_len, ex_primes <= 0 ? 2 : ex_primes + 2) <= 0) 337 goto err; 338 str = "modulus:"; 339 s = "publicExponent:"; 340 } else { 341 if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0) 342 goto err; 343 str = "Modulus:"; 344 s = "Exponent:"; 345 } 346 if (!ASN1_bn_print(bp, str, x->n, NULL, off)) 347 goto err; 348 if (!ASN1_bn_print(bp, s, x->e, NULL, off)) 349 goto err; 350 if (priv) { 351 int i; 352 353 if (!ASN1_bn_print(bp, "privateExponent:", x->d, NULL, off)) 354 goto err; 355 if (!ASN1_bn_print(bp, "prime1:", x->p, NULL, off)) 356 goto err; 357 if (!ASN1_bn_print(bp, "prime2:", x->q, NULL, off)) 358 goto err; 359 if (!ASN1_bn_print(bp, "exponent1:", x->dmp1, NULL, off)) 360 goto err; 361 if (!ASN1_bn_print(bp, "exponent2:", x->dmq1, NULL, off)) 362 goto err; 363 if (!ASN1_bn_print(bp, "coefficient:", x->iqmp, NULL, off)) 364 goto err; 365 for (i = 0; i < sk_RSA_PRIME_INFO_num(x->prime_infos); i++) { 366 /* print multi-prime info */ 367 BIGNUM *bn = NULL; 368 RSA_PRIME_INFO *pinfo; 369 int j; 370 371 pinfo = sk_RSA_PRIME_INFO_value(x->prime_infos, i); 372 for (j = 0; j < 3; j++) { 373 if (!BIO_indent(bp, off, 128)) 374 goto err; 375 switch (j) { 376 case 0: 377 if (BIO_printf(bp, "prime%d:", i + 3) <= 0) 378 goto err; 379 bn = pinfo->r; 380 break; 381 case 1: 382 if (BIO_printf(bp, "exponent%d:", i + 3) <= 0) 383 goto err; 384 bn = pinfo->d; 385 break; 386 case 2: 387 if (BIO_printf(bp, "coefficient%d:", i + 3) <= 0) 388 goto err; 389 bn = pinfo->t; 390 break; 391 default: 392 break; 393 } 394 if (!ASN1_bn_print(bp, "", bn, NULL, off)) 395 goto err; 396 } 397 } 398 } 399 if (pkey_is_pss(pkey) && !rsa_pss_param_print(bp, 1, x->pss, off)) 400 goto err; 401 ret = 1; 402 err: 403 return ret; 404 } 405 406 static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent, 407 ASN1_PCTX *ctx) 408 { 409 return pkey_rsa_print(bp, pkey, indent, 0); 410 } 411 412 static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent, 413 ASN1_PCTX *ctx) 414 { 415 return pkey_rsa_print(bp, pkey, indent, 1); 416 } 417 418 static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg) 419 { 420 RSA_PSS_PARAMS *pss; 421 422 pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_PSS_PARAMS), 423 alg->parameter); 424 425 if (pss == NULL) 426 return NULL; 427 428 if (pss->maskGenAlgorithm != NULL) { 429 pss->maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm); 430 if (pss->maskHash == NULL) { 431 RSA_PSS_PARAMS_free(pss); 432 return NULL; 433 } 434 } 435 436 return pss; 437 } 438 439 static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg, 440 const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx) 441 { 442 if (OBJ_obj2nid(sigalg->algorithm) == EVP_PKEY_RSA_PSS) { 443 int rv; 444 RSA_PSS_PARAMS *pss = rsa_pss_decode(sigalg); 445 446 rv = rsa_pss_param_print(bp, 0, pss, indent); 447 RSA_PSS_PARAMS_free(pss); 448 if (!rv) 449 return 0; 450 } else if (!sig && BIO_puts(bp, "\n") <= 0) { 451 return 0; 452 } 453 if (sig) 454 return X509_signature_dump(bp, sig, indent); 455 return 1; 456 } 457 458 static int rsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) 459 { 460 X509_ALGOR *alg = NULL; 461 462 switch (op) { 463 464 case ASN1_PKEY_CTRL_PKCS7_SIGN: 465 if (arg1 == 0) 466 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, NULL, &alg); 467 break; 468 469 case ASN1_PKEY_CTRL_PKCS7_ENCRYPT: 470 if (pkey_is_pss(pkey)) 471 return -2; 472 if (arg1 == 0) 473 PKCS7_RECIP_INFO_get0_alg(arg2, &alg); 474 break; 475 #ifndef OPENSSL_NO_CMS 476 case ASN1_PKEY_CTRL_CMS_SIGN: 477 if (arg1 == 0) 478 return rsa_cms_sign(arg2); 479 else if (arg1 == 1) 480 return rsa_cms_verify(arg2); 481 break; 482 483 case ASN1_PKEY_CTRL_CMS_ENVELOPE: 484 if (pkey_is_pss(pkey)) 485 return -2; 486 if (arg1 == 0) 487 return rsa_cms_encrypt(arg2); 488 else if (arg1 == 1) 489 return rsa_cms_decrypt(arg2); 490 break; 491 492 case ASN1_PKEY_CTRL_CMS_RI_TYPE: 493 if (pkey_is_pss(pkey)) 494 return -2; 495 *(int *)arg2 = CMS_RECIPINFO_TRANS; 496 return 1; 497 #endif 498 499 case ASN1_PKEY_CTRL_DEFAULT_MD_NID: 500 *(int *)arg2 = NID_sha256; 501 return 1; 502 503 default: 504 return -2; 505 506 } 507 508 if (alg) 509 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0); 510 511 return 1; 512 513 } 514 515 /* allocate and set algorithm ID from EVP_MD, default SHA1 */ 516 static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md) 517 { 518 if (md == NULL || EVP_MD_type(md) == NID_sha1) 519 return 1; 520 *palg = X509_ALGOR_new(); 521 if (*palg == NULL) 522 return 0; 523 X509_ALGOR_set_md(*palg, md); 524 return 1; 525 } 526 527 /* Allocate and set MGF1 algorithm ID from EVP_MD */ 528 static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md) 529 { 530 X509_ALGOR *algtmp = NULL; 531 ASN1_STRING *stmp = NULL; 532 533 *palg = NULL; 534 if (mgf1md == NULL || EVP_MD_type(mgf1md) == NID_sha1) 535 return 1; 536 /* need to embed algorithm ID inside another */ 537 if (!rsa_md_to_algor(&algtmp, mgf1md)) 538 goto err; 539 if (ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp) == NULL) 540 goto err; 541 *palg = X509_ALGOR_new(); 542 if (*palg == NULL) 543 goto err; 544 X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp); 545 stmp = NULL; 546 err: 547 ASN1_STRING_free(stmp); 548 X509_ALGOR_free(algtmp); 549 if (*palg) 550 return 1; 551 return 0; 552 } 553 554 /* convert algorithm ID to EVP_MD, default SHA1 */ 555 static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg) 556 { 557 const EVP_MD *md; 558 559 if (!alg) 560 return EVP_sha1(); 561 md = EVP_get_digestbyobj(alg->algorithm); 562 if (md == NULL) 563 RSAerr(RSA_F_RSA_ALGOR_TO_MD, RSA_R_UNKNOWN_DIGEST); 564 return md; 565 } 566 567 /* 568 * Convert EVP_PKEY_CTX in PSS mode into corresponding algorithm parameter, 569 * suitable for setting an AlgorithmIdentifier. 570 */ 571 572 static RSA_PSS_PARAMS *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx) 573 { 574 const EVP_MD *sigmd, *mgf1md; 575 EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx); 576 int saltlen; 577 578 if (EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) <= 0) 579 return NULL; 580 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0) 581 return NULL; 582 if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen)) 583 return NULL; 584 if (saltlen == -1) { 585 saltlen = EVP_MD_size(sigmd); 586 } else if (saltlen == -2) { 587 saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2; 588 if ((EVP_PKEY_bits(pk) & 0x7) == 1) 589 saltlen--; 590 } 591 592 return rsa_pss_params_create(sigmd, mgf1md, saltlen); 593 } 594 595 RSA_PSS_PARAMS *rsa_pss_params_create(const EVP_MD *sigmd, 596 const EVP_MD *mgf1md, int saltlen) 597 { 598 RSA_PSS_PARAMS *pss = RSA_PSS_PARAMS_new(); 599 600 if (pss == NULL) 601 goto err; 602 if (saltlen != 20) { 603 pss->saltLength = ASN1_INTEGER_new(); 604 if (pss->saltLength == NULL) 605 goto err; 606 if (!ASN1_INTEGER_set(pss->saltLength, saltlen)) 607 goto err; 608 } 609 if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd)) 610 goto err; 611 if (mgf1md == NULL) 612 mgf1md = sigmd; 613 if (!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md)) 614 goto err; 615 if (!rsa_md_to_algor(&pss->maskHash, mgf1md)) 616 goto err; 617 return pss; 618 err: 619 RSA_PSS_PARAMS_free(pss); 620 return NULL; 621 } 622 623 static ASN1_STRING *rsa_ctx_to_pss_string(EVP_PKEY_CTX *pkctx) 624 { 625 RSA_PSS_PARAMS *pss = rsa_ctx_to_pss(pkctx); 626 ASN1_STRING *os; 627 628 if (pss == NULL) 629 return NULL; 630 631 os = ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), NULL); 632 RSA_PSS_PARAMS_free(pss); 633 return os; 634 } 635 636 /* 637 * From PSS AlgorithmIdentifier set public key parameters. If pkey isn't NULL 638 * then the EVP_MD_CTX is setup and initialised. If it is NULL parameters are 639 * passed to pkctx instead. 640 */ 641 642 static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx, 643 X509_ALGOR *sigalg, EVP_PKEY *pkey) 644 { 645 int rv = -1; 646 int saltlen; 647 const EVP_MD *mgf1md = NULL, *md = NULL; 648 RSA_PSS_PARAMS *pss; 649 650 /* Sanity check: make sure it is PSS */ 651 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) { 652 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE); 653 return -1; 654 } 655 /* Decode PSS parameters */ 656 pss = rsa_pss_decode(sigalg); 657 658 if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) { 659 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_PSS_PARAMETERS); 660 goto err; 661 } 662 663 /* We have all parameters now set up context */ 664 if (pkey) { 665 if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey)) 666 goto err; 667 } else { 668 const EVP_MD *checkmd; 669 if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0) 670 goto err; 671 if (EVP_MD_type(md) != EVP_MD_type(checkmd)) { 672 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_DIGEST_DOES_NOT_MATCH); 673 goto err; 674 } 675 } 676 677 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0) 678 goto err; 679 680 if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0) 681 goto err; 682 683 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0) 684 goto err; 685 /* Carry on */ 686 rv = 1; 687 688 err: 689 RSA_PSS_PARAMS_free(pss); 690 return rv; 691 } 692 693 int rsa_pss_get_param(const RSA_PSS_PARAMS *pss, const EVP_MD **pmd, 694 const EVP_MD **pmgf1md, int *psaltlen) 695 { 696 if (pss == NULL) 697 return 0; 698 *pmd = rsa_algor_to_md(pss->hashAlgorithm); 699 if (*pmd == NULL) 700 return 0; 701 *pmgf1md = rsa_algor_to_md(pss->maskHash); 702 if (*pmgf1md == NULL) 703 return 0; 704 if (pss->saltLength) { 705 *psaltlen = ASN1_INTEGER_get(pss->saltLength); 706 if (*psaltlen < 0) { 707 RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_SALT_LENGTH); 708 return 0; 709 } 710 } else { 711 *psaltlen = 20; 712 } 713 714 /* 715 * low-level routines support only trailer field 0xbc (value 1) and 716 * PKCS#1 says we should reject any other value anyway. 717 */ 718 if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) { 719 RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_TRAILER); 720 return 0; 721 } 722 723 return 1; 724 } 725 726 #ifndef OPENSSL_NO_CMS 727 static int rsa_cms_verify(CMS_SignerInfo *si) 728 { 729 int nid, nid2; 730 X509_ALGOR *alg; 731 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si); 732 733 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg); 734 nid = OBJ_obj2nid(alg->algorithm); 735 if (nid == EVP_PKEY_RSA_PSS) 736 return rsa_pss_to_ctx(NULL, pkctx, alg, NULL); 737 /* Only PSS allowed for PSS keys */ 738 if (pkey_ctx_is_pss(pkctx)) { 739 RSAerr(RSA_F_RSA_CMS_VERIFY, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE); 740 return 0; 741 } 742 if (nid == NID_rsaEncryption) 743 return 1; 744 /* Workaround for some implementation that use a signature OID */ 745 if (OBJ_find_sigid_algs(nid, NULL, &nid2)) { 746 if (nid2 == NID_rsaEncryption) 747 return 1; 748 } 749 return 0; 750 } 751 #endif 752 753 /* 754 * Customised RSA item verification routine. This is called when a signature 755 * is encountered requiring special handling. We currently only handle PSS. 756 */ 757 758 static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn, 759 X509_ALGOR *sigalg, ASN1_BIT_STRING *sig, 760 EVP_PKEY *pkey) 761 { 762 /* Sanity check: make sure it is PSS */ 763 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) { 764 RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE); 765 return -1; 766 } 767 if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) { 768 /* Carry on */ 769 return 2; 770 } 771 return -1; 772 } 773 774 #ifndef OPENSSL_NO_CMS 775 static int rsa_cms_sign(CMS_SignerInfo *si) 776 { 777 int pad_mode = RSA_PKCS1_PADDING; 778 X509_ALGOR *alg; 779 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si); 780 ASN1_STRING *os = NULL; 781 782 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg); 783 if (pkctx) { 784 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0) 785 return 0; 786 } 787 if (pad_mode == RSA_PKCS1_PADDING) { 788 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0); 789 return 1; 790 } 791 /* We don't support it */ 792 if (pad_mode != RSA_PKCS1_PSS_PADDING) 793 return 0; 794 os = rsa_ctx_to_pss_string(pkctx); 795 if (!os) 796 return 0; 797 X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_PKEY_RSA_PSS), V_ASN1_SEQUENCE, os); 798 return 1; 799 } 800 #endif 801 802 static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn, 803 X509_ALGOR *alg1, X509_ALGOR *alg2, 804 ASN1_BIT_STRING *sig) 805 { 806 int pad_mode; 807 EVP_PKEY_CTX *pkctx = EVP_MD_CTX_pkey_ctx(ctx); 808 809 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0) 810 return 0; 811 if (pad_mode == RSA_PKCS1_PADDING) 812 return 2; 813 if (pad_mode == RSA_PKCS1_PSS_PADDING) { 814 ASN1_STRING *os1 = NULL; 815 os1 = rsa_ctx_to_pss_string(pkctx); 816 if (!os1) 817 return 0; 818 /* Duplicate parameters if we have to */ 819 if (alg2) { 820 ASN1_STRING *os2 = ASN1_STRING_dup(os1); 821 if (!os2) { 822 ASN1_STRING_free(os1); 823 return 0; 824 } 825 X509_ALGOR_set0(alg2, OBJ_nid2obj(EVP_PKEY_RSA_PSS), 826 V_ASN1_SEQUENCE, os2); 827 } 828 X509_ALGOR_set0(alg1, OBJ_nid2obj(EVP_PKEY_RSA_PSS), 829 V_ASN1_SEQUENCE, os1); 830 return 3; 831 } 832 return 2; 833 } 834 835 static int rsa_sig_info_set(X509_SIG_INFO *siginf, const X509_ALGOR *sigalg, 836 const ASN1_STRING *sig) 837 { 838 int rv = 0; 839 int mdnid, saltlen; 840 uint32_t flags; 841 const EVP_MD *mgf1md = NULL, *md = NULL; 842 RSA_PSS_PARAMS *pss; 843 844 /* Sanity check: make sure it is PSS */ 845 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) 846 return 0; 847 /* Decode PSS parameters */ 848 pss = rsa_pss_decode(sigalg); 849 if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) 850 goto err; 851 mdnid = EVP_MD_type(md); 852 /* 853 * For TLS need SHA256, SHA384 or SHA512, digest and MGF1 digest must 854 * match and salt length must equal digest size 855 */ 856 if ((mdnid == NID_sha256 || mdnid == NID_sha384 || mdnid == NID_sha512) 857 && mdnid == EVP_MD_type(mgf1md) && saltlen == EVP_MD_size(md)) 858 flags = X509_SIG_INFO_TLS; 859 else 860 flags = 0; 861 /* Note: security bits half number of digest bits */ 862 X509_SIG_INFO_set(siginf, mdnid, EVP_PKEY_RSA_PSS, EVP_MD_size(md) * 4, 863 flags); 864 rv = 1; 865 err: 866 RSA_PSS_PARAMS_free(pss); 867 return rv; 868 } 869 870 #ifndef OPENSSL_NO_CMS 871 static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg) 872 { 873 RSA_OAEP_PARAMS *oaep; 874 875 oaep = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS), 876 alg->parameter); 877 878 if (oaep == NULL) 879 return NULL; 880 881 if (oaep->maskGenFunc != NULL) { 882 oaep->maskHash = rsa_mgf1_decode(oaep->maskGenFunc); 883 if (oaep->maskHash == NULL) { 884 RSA_OAEP_PARAMS_free(oaep); 885 return NULL; 886 } 887 } 888 return oaep; 889 } 890 891 static int rsa_cms_decrypt(CMS_RecipientInfo *ri) 892 { 893 EVP_PKEY_CTX *pkctx; 894 X509_ALGOR *cmsalg; 895 int nid; 896 int rv = -1; 897 unsigned char *label = NULL; 898 int labellen = 0; 899 const EVP_MD *mgf1md = NULL, *md = NULL; 900 RSA_OAEP_PARAMS *oaep; 901 902 pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri); 903 if (pkctx == NULL) 904 return 0; 905 if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg)) 906 return -1; 907 nid = OBJ_obj2nid(cmsalg->algorithm); 908 if (nid == NID_rsaEncryption) 909 return 1; 910 if (nid != NID_rsaesOaep) { 911 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_ENCRYPTION_TYPE); 912 return -1; 913 } 914 /* Decode OAEP parameters */ 915 oaep = rsa_oaep_decode(cmsalg); 916 917 if (oaep == NULL) { 918 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_OAEP_PARAMETERS); 919 goto err; 920 } 921 922 mgf1md = rsa_algor_to_md(oaep->maskHash); 923 if (mgf1md == NULL) 924 goto err; 925 md = rsa_algor_to_md(oaep->hashFunc); 926 if (md == NULL) 927 goto err; 928 929 if (oaep->pSourceFunc != NULL) { 930 X509_ALGOR *plab = oaep->pSourceFunc; 931 932 if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) { 933 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_LABEL_SOURCE); 934 goto err; 935 } 936 if (plab->parameter->type != V_ASN1_OCTET_STRING) { 937 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_LABEL); 938 goto err; 939 } 940 941 label = plab->parameter->value.octet_string->data; 942 /* Stop label being freed when OAEP parameters are freed */ 943 plab->parameter->value.octet_string->data = NULL; 944 labellen = plab->parameter->value.octet_string->length; 945 } 946 947 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0) 948 goto err; 949 if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0) 950 goto err; 951 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0) 952 goto err; 953 if (EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0) 954 goto err; 955 /* Carry on */ 956 rv = 1; 957 958 err: 959 RSA_OAEP_PARAMS_free(oaep); 960 return rv; 961 } 962 963 static int rsa_cms_encrypt(CMS_RecipientInfo *ri) 964 { 965 const EVP_MD *md, *mgf1md; 966 RSA_OAEP_PARAMS *oaep = NULL; 967 ASN1_STRING *os = NULL; 968 X509_ALGOR *alg; 969 EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri); 970 int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen; 971 unsigned char *label; 972 973 if (CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg) <= 0) 974 return 0; 975 if (pkctx) { 976 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0) 977 return 0; 978 } 979 if (pad_mode == RSA_PKCS1_PADDING) { 980 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0); 981 return 1; 982 } 983 /* Not supported */ 984 if (pad_mode != RSA_PKCS1_OAEP_PADDING) 985 return 0; 986 if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0) 987 goto err; 988 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0) 989 goto err; 990 labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label); 991 if (labellen < 0) 992 goto err; 993 oaep = RSA_OAEP_PARAMS_new(); 994 if (oaep == NULL) 995 goto err; 996 if (!rsa_md_to_algor(&oaep->hashFunc, md)) 997 goto err; 998 if (!rsa_md_to_mgf1(&oaep->maskGenFunc, mgf1md)) 999 goto err; 1000 if (labellen > 0) { 1001 ASN1_OCTET_STRING *los; 1002 oaep->pSourceFunc = X509_ALGOR_new(); 1003 if (oaep->pSourceFunc == NULL) 1004 goto err; 1005 los = ASN1_OCTET_STRING_new(); 1006 if (los == NULL) 1007 goto err; 1008 if (!ASN1_OCTET_STRING_set(los, label, labellen)) { 1009 ASN1_OCTET_STRING_free(los); 1010 goto err; 1011 } 1012 X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified), 1013 V_ASN1_OCTET_STRING, los); 1014 } 1015 /* create string with pss parameter encoding. */ 1016 if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os)) 1017 goto err; 1018 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os); 1019 os = NULL; 1020 rv = 1; 1021 err: 1022 RSA_OAEP_PARAMS_free(oaep); 1023 ASN1_STRING_free(os); 1024 return rv; 1025 } 1026 #endif 1027 1028 static int rsa_pkey_check(const EVP_PKEY *pkey) 1029 { 1030 return RSA_check_key_ex(pkey->pkey.rsa, NULL); 1031 } 1032 1033 const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[2] = { 1034 { 1035 EVP_PKEY_RSA, 1036 EVP_PKEY_RSA, 1037 ASN1_PKEY_SIGPARAM_NULL, 1038 1039 "RSA", 1040 "OpenSSL RSA method", 1041 1042 rsa_pub_decode, 1043 rsa_pub_encode, 1044 rsa_pub_cmp, 1045 rsa_pub_print, 1046 1047 rsa_priv_decode, 1048 rsa_priv_encode, 1049 rsa_priv_print, 1050 1051 int_rsa_size, 1052 rsa_bits, 1053 rsa_security_bits, 1054 1055 0, 0, 0, 0, 0, 0, 1056 1057 rsa_sig_print, 1058 int_rsa_free, 1059 rsa_pkey_ctrl, 1060 old_rsa_priv_decode, 1061 old_rsa_priv_encode, 1062 rsa_item_verify, 1063 rsa_item_sign, 1064 rsa_sig_info_set, 1065 rsa_pkey_check 1066 }, 1067 1068 { 1069 EVP_PKEY_RSA2, 1070 EVP_PKEY_RSA, 1071 ASN1_PKEY_ALIAS} 1072 }; 1073 1074 const EVP_PKEY_ASN1_METHOD rsa_pss_asn1_meth = { 1075 EVP_PKEY_RSA_PSS, 1076 EVP_PKEY_RSA_PSS, 1077 ASN1_PKEY_SIGPARAM_NULL, 1078 1079 "RSA-PSS", 1080 "OpenSSL RSA-PSS method", 1081 1082 rsa_pub_decode, 1083 rsa_pub_encode, 1084 rsa_pub_cmp, 1085 rsa_pub_print, 1086 1087 rsa_priv_decode, 1088 rsa_priv_encode, 1089 rsa_priv_print, 1090 1091 int_rsa_size, 1092 rsa_bits, 1093 rsa_security_bits, 1094 1095 0, 0, 0, 0, 0, 0, 1096 1097 rsa_sig_print, 1098 int_rsa_free, 1099 rsa_pkey_ctrl, 1100 0, 0, 1101 rsa_item_verify, 1102 rsa_item_sign, 1103 0, 1104 rsa_pkey_check 1105 }; 1106