1 /* 2 * Copyright 2006-2019 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 || saltlen == -3) { 587 saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2; 588 if ((EVP_PKEY_bits(pk) & 0x7) == 1) 589 saltlen--; 590 if (saltlen < 0) 591 return NULL; 592 } 593 594 return rsa_pss_params_create(sigmd, mgf1md, saltlen); 595 } 596 597 RSA_PSS_PARAMS *rsa_pss_params_create(const EVP_MD *sigmd, 598 const EVP_MD *mgf1md, int saltlen) 599 { 600 RSA_PSS_PARAMS *pss = RSA_PSS_PARAMS_new(); 601 602 if (pss == NULL) 603 goto err; 604 if (saltlen != 20) { 605 pss->saltLength = ASN1_INTEGER_new(); 606 if (pss->saltLength == NULL) 607 goto err; 608 if (!ASN1_INTEGER_set(pss->saltLength, saltlen)) 609 goto err; 610 } 611 if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd)) 612 goto err; 613 if (mgf1md == NULL) 614 mgf1md = sigmd; 615 if (!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md)) 616 goto err; 617 if (!rsa_md_to_algor(&pss->maskHash, mgf1md)) 618 goto err; 619 return pss; 620 err: 621 RSA_PSS_PARAMS_free(pss); 622 return NULL; 623 } 624 625 static ASN1_STRING *rsa_ctx_to_pss_string(EVP_PKEY_CTX *pkctx) 626 { 627 RSA_PSS_PARAMS *pss = rsa_ctx_to_pss(pkctx); 628 ASN1_STRING *os; 629 630 if (pss == NULL) 631 return NULL; 632 633 os = ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), NULL); 634 RSA_PSS_PARAMS_free(pss); 635 return os; 636 } 637 638 /* 639 * From PSS AlgorithmIdentifier set public key parameters. If pkey isn't NULL 640 * then the EVP_MD_CTX is setup and initialised. If it is NULL parameters are 641 * passed to pkctx instead. 642 */ 643 644 static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx, 645 X509_ALGOR *sigalg, EVP_PKEY *pkey) 646 { 647 int rv = -1; 648 int saltlen; 649 const EVP_MD *mgf1md = NULL, *md = NULL; 650 RSA_PSS_PARAMS *pss; 651 652 /* Sanity check: make sure it is PSS */ 653 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) { 654 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE); 655 return -1; 656 } 657 /* Decode PSS parameters */ 658 pss = rsa_pss_decode(sigalg); 659 660 if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) { 661 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_PSS_PARAMETERS); 662 goto err; 663 } 664 665 /* We have all parameters now set up context */ 666 if (pkey) { 667 if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey)) 668 goto err; 669 } else { 670 const EVP_MD *checkmd; 671 if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0) 672 goto err; 673 if (EVP_MD_type(md) != EVP_MD_type(checkmd)) { 674 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_DIGEST_DOES_NOT_MATCH); 675 goto err; 676 } 677 } 678 679 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0) 680 goto err; 681 682 if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0) 683 goto err; 684 685 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0) 686 goto err; 687 /* Carry on */ 688 rv = 1; 689 690 err: 691 RSA_PSS_PARAMS_free(pss); 692 return rv; 693 } 694 695 int rsa_pss_get_param(const RSA_PSS_PARAMS *pss, const EVP_MD **pmd, 696 const EVP_MD **pmgf1md, int *psaltlen) 697 { 698 if (pss == NULL) 699 return 0; 700 *pmd = rsa_algor_to_md(pss->hashAlgorithm); 701 if (*pmd == NULL) 702 return 0; 703 *pmgf1md = rsa_algor_to_md(pss->maskHash); 704 if (*pmgf1md == NULL) 705 return 0; 706 if (pss->saltLength) { 707 *psaltlen = ASN1_INTEGER_get(pss->saltLength); 708 if (*psaltlen < 0) { 709 RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_SALT_LENGTH); 710 return 0; 711 } 712 } else { 713 *psaltlen = 20; 714 } 715 716 /* 717 * low-level routines support only trailer field 0xbc (value 1) and 718 * PKCS#1 says we should reject any other value anyway. 719 */ 720 if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) { 721 RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_TRAILER); 722 return 0; 723 } 724 725 return 1; 726 } 727 728 #ifndef OPENSSL_NO_CMS 729 static int rsa_cms_verify(CMS_SignerInfo *si) 730 { 731 int nid, nid2; 732 X509_ALGOR *alg; 733 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si); 734 735 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg); 736 nid = OBJ_obj2nid(alg->algorithm); 737 if (nid == EVP_PKEY_RSA_PSS) 738 return rsa_pss_to_ctx(NULL, pkctx, alg, NULL); 739 /* Only PSS allowed for PSS keys */ 740 if (pkey_ctx_is_pss(pkctx)) { 741 RSAerr(RSA_F_RSA_CMS_VERIFY, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE); 742 return 0; 743 } 744 if (nid == NID_rsaEncryption) 745 return 1; 746 /* Workaround for some implementation that use a signature OID */ 747 if (OBJ_find_sigid_algs(nid, NULL, &nid2)) { 748 if (nid2 == NID_rsaEncryption) 749 return 1; 750 } 751 return 0; 752 } 753 #endif 754 755 /* 756 * Customised RSA item verification routine. This is called when a signature 757 * is encountered requiring special handling. We currently only handle PSS. 758 */ 759 760 static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn, 761 X509_ALGOR *sigalg, ASN1_BIT_STRING *sig, 762 EVP_PKEY *pkey) 763 { 764 /* Sanity check: make sure it is PSS */ 765 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) { 766 RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE); 767 return -1; 768 } 769 if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) { 770 /* Carry on */ 771 return 2; 772 } 773 return -1; 774 } 775 776 #ifndef OPENSSL_NO_CMS 777 static int rsa_cms_sign(CMS_SignerInfo *si) 778 { 779 int pad_mode = RSA_PKCS1_PADDING; 780 X509_ALGOR *alg; 781 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si); 782 ASN1_STRING *os = NULL; 783 784 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg); 785 if (pkctx) { 786 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0) 787 return 0; 788 } 789 if (pad_mode == RSA_PKCS1_PADDING) { 790 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0); 791 return 1; 792 } 793 /* We don't support it */ 794 if (pad_mode != RSA_PKCS1_PSS_PADDING) 795 return 0; 796 os = rsa_ctx_to_pss_string(pkctx); 797 if (!os) 798 return 0; 799 X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_PKEY_RSA_PSS), V_ASN1_SEQUENCE, os); 800 return 1; 801 } 802 #endif 803 804 static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn, 805 X509_ALGOR *alg1, X509_ALGOR *alg2, 806 ASN1_BIT_STRING *sig) 807 { 808 int pad_mode; 809 EVP_PKEY_CTX *pkctx = EVP_MD_CTX_pkey_ctx(ctx); 810 811 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0) 812 return 0; 813 if (pad_mode == RSA_PKCS1_PADDING) 814 return 2; 815 if (pad_mode == RSA_PKCS1_PSS_PADDING) { 816 ASN1_STRING *os1 = NULL; 817 os1 = rsa_ctx_to_pss_string(pkctx); 818 if (!os1) 819 return 0; 820 /* Duplicate parameters if we have to */ 821 if (alg2) { 822 ASN1_STRING *os2 = ASN1_STRING_dup(os1); 823 if (!os2) { 824 ASN1_STRING_free(os1); 825 return 0; 826 } 827 X509_ALGOR_set0(alg2, OBJ_nid2obj(EVP_PKEY_RSA_PSS), 828 V_ASN1_SEQUENCE, os2); 829 } 830 X509_ALGOR_set0(alg1, OBJ_nid2obj(EVP_PKEY_RSA_PSS), 831 V_ASN1_SEQUENCE, os1); 832 return 3; 833 } 834 return 2; 835 } 836 837 static int rsa_sig_info_set(X509_SIG_INFO *siginf, const X509_ALGOR *sigalg, 838 const ASN1_STRING *sig) 839 { 840 int rv = 0; 841 int mdnid, saltlen; 842 uint32_t flags; 843 const EVP_MD *mgf1md = NULL, *md = NULL; 844 RSA_PSS_PARAMS *pss; 845 846 /* Sanity check: make sure it is PSS */ 847 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) 848 return 0; 849 /* Decode PSS parameters */ 850 pss = rsa_pss_decode(sigalg); 851 if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) 852 goto err; 853 mdnid = EVP_MD_type(md); 854 /* 855 * For TLS need SHA256, SHA384 or SHA512, digest and MGF1 digest must 856 * match and salt length must equal digest size 857 */ 858 if ((mdnid == NID_sha256 || mdnid == NID_sha384 || mdnid == NID_sha512) 859 && mdnid == EVP_MD_type(mgf1md) && saltlen == EVP_MD_size(md)) 860 flags = X509_SIG_INFO_TLS; 861 else 862 flags = 0; 863 /* Note: security bits half number of digest bits */ 864 X509_SIG_INFO_set(siginf, mdnid, EVP_PKEY_RSA_PSS, EVP_MD_size(md) * 4, 865 flags); 866 rv = 1; 867 err: 868 RSA_PSS_PARAMS_free(pss); 869 return rv; 870 } 871 872 #ifndef OPENSSL_NO_CMS 873 static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg) 874 { 875 RSA_OAEP_PARAMS *oaep; 876 877 oaep = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS), 878 alg->parameter); 879 880 if (oaep == NULL) 881 return NULL; 882 883 if (oaep->maskGenFunc != NULL) { 884 oaep->maskHash = rsa_mgf1_decode(oaep->maskGenFunc); 885 if (oaep->maskHash == NULL) { 886 RSA_OAEP_PARAMS_free(oaep); 887 return NULL; 888 } 889 } 890 return oaep; 891 } 892 893 static int rsa_cms_decrypt(CMS_RecipientInfo *ri) 894 { 895 EVP_PKEY_CTX *pkctx; 896 X509_ALGOR *cmsalg; 897 int nid; 898 int rv = -1; 899 unsigned char *label = NULL; 900 int labellen = 0; 901 const EVP_MD *mgf1md = NULL, *md = NULL; 902 RSA_OAEP_PARAMS *oaep; 903 904 pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri); 905 if (pkctx == NULL) 906 return 0; 907 if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg)) 908 return -1; 909 nid = OBJ_obj2nid(cmsalg->algorithm); 910 if (nid == NID_rsaEncryption) 911 return 1; 912 if (nid != NID_rsaesOaep) { 913 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_ENCRYPTION_TYPE); 914 return -1; 915 } 916 /* Decode OAEP parameters */ 917 oaep = rsa_oaep_decode(cmsalg); 918 919 if (oaep == NULL) { 920 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_OAEP_PARAMETERS); 921 goto err; 922 } 923 924 mgf1md = rsa_algor_to_md(oaep->maskHash); 925 if (mgf1md == NULL) 926 goto err; 927 md = rsa_algor_to_md(oaep->hashFunc); 928 if (md == NULL) 929 goto err; 930 931 if (oaep->pSourceFunc != NULL) { 932 X509_ALGOR *plab = oaep->pSourceFunc; 933 934 if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) { 935 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_LABEL_SOURCE); 936 goto err; 937 } 938 if (plab->parameter->type != V_ASN1_OCTET_STRING) { 939 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_LABEL); 940 goto err; 941 } 942 943 label = plab->parameter->value.octet_string->data; 944 /* Stop label being freed when OAEP parameters are freed */ 945 plab->parameter->value.octet_string->data = NULL; 946 labellen = plab->parameter->value.octet_string->length; 947 } 948 949 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0) 950 goto err; 951 if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0) 952 goto err; 953 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0) 954 goto err; 955 if (EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0) 956 goto err; 957 /* Carry on */ 958 rv = 1; 959 960 err: 961 RSA_OAEP_PARAMS_free(oaep); 962 return rv; 963 } 964 965 static int rsa_cms_encrypt(CMS_RecipientInfo *ri) 966 { 967 const EVP_MD *md, *mgf1md; 968 RSA_OAEP_PARAMS *oaep = NULL; 969 ASN1_STRING *os = NULL; 970 X509_ALGOR *alg; 971 EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri); 972 int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen; 973 unsigned char *label; 974 975 if (CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg) <= 0) 976 return 0; 977 if (pkctx) { 978 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0) 979 return 0; 980 } 981 if (pad_mode == RSA_PKCS1_PADDING) { 982 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0); 983 return 1; 984 } 985 /* Not supported */ 986 if (pad_mode != RSA_PKCS1_OAEP_PADDING) 987 return 0; 988 if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0) 989 goto err; 990 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0) 991 goto err; 992 labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label); 993 if (labellen < 0) 994 goto err; 995 oaep = RSA_OAEP_PARAMS_new(); 996 if (oaep == NULL) 997 goto err; 998 if (!rsa_md_to_algor(&oaep->hashFunc, md)) 999 goto err; 1000 if (!rsa_md_to_mgf1(&oaep->maskGenFunc, mgf1md)) 1001 goto err; 1002 if (labellen > 0) { 1003 ASN1_OCTET_STRING *los; 1004 oaep->pSourceFunc = X509_ALGOR_new(); 1005 if (oaep->pSourceFunc == NULL) 1006 goto err; 1007 los = ASN1_OCTET_STRING_new(); 1008 if (los == NULL) 1009 goto err; 1010 if (!ASN1_OCTET_STRING_set(los, label, labellen)) { 1011 ASN1_OCTET_STRING_free(los); 1012 goto err; 1013 } 1014 X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified), 1015 V_ASN1_OCTET_STRING, los); 1016 } 1017 /* create string with pss parameter encoding. */ 1018 if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os)) 1019 goto err; 1020 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os); 1021 os = NULL; 1022 rv = 1; 1023 err: 1024 RSA_OAEP_PARAMS_free(oaep); 1025 ASN1_STRING_free(os); 1026 return rv; 1027 } 1028 #endif 1029 1030 static int rsa_pkey_check(const EVP_PKEY *pkey) 1031 { 1032 return RSA_check_key_ex(pkey->pkey.rsa, NULL); 1033 } 1034 1035 const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[2] = { 1036 { 1037 EVP_PKEY_RSA, 1038 EVP_PKEY_RSA, 1039 ASN1_PKEY_SIGPARAM_NULL, 1040 1041 "RSA", 1042 "OpenSSL RSA method", 1043 1044 rsa_pub_decode, 1045 rsa_pub_encode, 1046 rsa_pub_cmp, 1047 rsa_pub_print, 1048 1049 rsa_priv_decode, 1050 rsa_priv_encode, 1051 rsa_priv_print, 1052 1053 int_rsa_size, 1054 rsa_bits, 1055 rsa_security_bits, 1056 1057 0, 0, 0, 0, 0, 0, 1058 1059 rsa_sig_print, 1060 int_rsa_free, 1061 rsa_pkey_ctrl, 1062 old_rsa_priv_decode, 1063 old_rsa_priv_encode, 1064 rsa_item_verify, 1065 rsa_item_sign, 1066 rsa_sig_info_set, 1067 rsa_pkey_check 1068 }, 1069 1070 { 1071 EVP_PKEY_RSA2, 1072 EVP_PKEY_RSA, 1073 ASN1_PKEY_ALIAS} 1074 }; 1075 1076 const EVP_PKEY_ASN1_METHOD rsa_pss_asn1_meth = { 1077 EVP_PKEY_RSA_PSS, 1078 EVP_PKEY_RSA_PSS, 1079 ASN1_PKEY_SIGPARAM_NULL, 1080 1081 "RSA-PSS", 1082 "OpenSSL RSA-PSS method", 1083 1084 rsa_pub_decode, 1085 rsa_pub_encode, 1086 rsa_pub_cmp, 1087 rsa_pub_print, 1088 1089 rsa_priv_decode, 1090 rsa_priv_encode, 1091 rsa_priv_print, 1092 1093 int_rsa_size, 1094 rsa_bits, 1095 rsa_security_bits, 1096 1097 0, 0, 0, 0, 0, 0, 1098 1099 rsa_sig_print, 1100 int_rsa_free, 1101 rsa_pkey_ctrl, 1102 0, 0, 1103 rsa_item_verify, 1104 rsa_item_sign, 1105 0, 1106 rsa_pkey_check 1107 }; 1108