crypto/rsa/rsa_ameth.c

   1 /* crypto/rsa/rsa_ameth.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 2006.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61 #include "cryptlib.h"
  62 #include <openssl/asn1t.h>
  63 #include <openssl/x509.h>
  64 #include <openssl/rsa.h>
  65 #include <openssl/bn.h>
  66 #ifndef OPENSSL_NO_CMS
  67 # include <openssl/cms.h>
  68 #endif
  69 #include "internal/asn1_int.h"
  70
  71 static int rsa_cms_sign(CMS_SignerInfo *si);
  72 static int rsa_cms_verify(CMS_SignerInfo *si);
  73 static int rsa_cms_decrypt(CMS_RecipientInfo *ri);
  74 static int rsa_cms_encrypt(CMS_RecipientInfo *ri);
  75
  76 static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
  77 {
  78     unsigned char *penc = NULL;
  79     int penclen;
  80     penclen = i2d_RSAPublicKey(pkey->pkey.rsa, &penc);
  81     if (penclen <= 0)
  82         return 0;
  83     if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_RSA),
  84                                V_ASN1_NULL, NULL, penc, penclen))
  85         return 1;
  86
  87     OPENSSL_free(penc);
  88     return 0;
  89 }
  90
  91 static int rsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
  92 {
  93     const unsigned char *p;
  94     int pklen;
  95     RSA *rsa = NULL;
  96     if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, NULL, pubkey))
  97         return 0;
  98     if (!(rsa = d2i_RSAPublicKey(NULL, &p, pklen))) {
  99         RSAerr(RSA_F_RSA_PUB_DECODE, ERR_R_RSA_LIB);
 100         return 0;
 101     }
 102     EVP_PKEY_assign_RSA(pkey, rsa);
 103     return 1;
 104 }
 105
 106 static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 107 {
 108     if (BN_cmp(b->pkey.rsa->n, a->pkey.rsa->n) != 0
 109         || BN_cmp(b->pkey.rsa->e, a->pkey.rsa->e) != 0)
 110         return 0;
 111     return 1;
 112 }
 113
 114 static int old_rsa_priv_decode(EVP_PKEY *pkey,
 115                                const unsigned char **pder, int derlen)
 116 {
 117     RSA *rsa;
 118     if (!(rsa = d2i_RSAPrivateKey(NULL, pder, derlen))) {
 119         RSAerr(RSA_F_OLD_RSA_PRIV_DECODE, ERR_R_RSA_LIB);
 120         return 0;
 121     }
 122     EVP_PKEY_assign_RSA(pkey, rsa);
 123     return 1;
 124 }
 125
 126 static int old_rsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
 127 {
 128     return i2d_RSAPrivateKey(pkey->pkey.rsa, pder);
 129 }
 130
 131 static int rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
 132 {
 133     unsigned char *rk = NULL;
 134     int rklen;
 135     rklen = i2d_RSAPrivateKey(pkey->pkey.rsa, &rk);
 136
 137     if (rklen <= 0) {
 138         RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
 139         return 0;
 140     }
 141
 142     if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_rsaEncryption), 0,
 143                          V_ASN1_NULL, NULL, rk, rklen)) {
 144         RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
 145         return 0;
 146     }
 147
 148     return 1;
 149 }
 150
 151 static int rsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
 152 {
 153     const unsigned char *p;
 154     int pklen;
 155     if (!PKCS8_pkey_get0(NULL, &p, &pklen, NULL, p8))
 156         return 0;
 157     return old_rsa_priv_decode(pkey, &p, pklen);
 158 }
 159
 160 static int int_rsa_size(const EVP_PKEY *pkey)
 161 {
 162     return RSA_size(pkey->pkey.rsa);
 163 }
 164
 165 static int rsa_bits(const EVP_PKEY *pkey)
 166 {
 167     return BN_num_bits(pkey->pkey.rsa->n);
 168 }
 169
 170 static int rsa_security_bits(const EVP_PKEY *pkey)
 171 {
 172     return RSA_security_bits(pkey->pkey.rsa);
 173 }
 174
 175 static void int_rsa_free(EVP_PKEY *pkey)
 176 {
 177     RSA_free(pkey->pkey.rsa);
 178 }
 179
 180 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
 181 {
 182     size_t i;
 183     if (!b)
 184         return;
 185     if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
 186         *pbuflen = i;
 187 }
 188
 189 static int do_rsa_print(BIO *bp, const RSA *x, int off, int priv)
 190 {
 191     char *str;
 192     const char *s;
 193     unsigned char *m = NULL;
 194     int ret = 0, mod_len = 0;
 195     size_t buf_len = 0;
 196
 197     update_buflen(x->n, &buf_len);
 198     update_buflen(x->e, &buf_len);
 199
 200     if (priv) {
 201         update_buflen(x->d, &buf_len);
 202         update_buflen(x->p, &buf_len);
 203         update_buflen(x->q, &buf_len);
 204         update_buflen(x->dmp1, &buf_len);
 205         update_buflen(x->dmq1, &buf_len);
 206         update_buflen(x->iqmp, &buf_len);
 207     }
 208
 209     m = OPENSSL_malloc(buf_len + 10);
 210     if (m == NULL) {
 211         RSAerr(RSA_F_DO_RSA_PRINT, ERR_R_MALLOC_FAILURE);
 212         goto err;
 213     }
 214
 215     if (x->n != NULL)
 216         mod_len = BN_num_bits(x->n);
 217
 218     if (!BIO_indent(bp, off, 128))
 219         goto err;
 220
 221     if (priv && x->d) {
 222         if (BIO_printf(bp, "Private-Key: (%d bit)\n", mod_len)
 223             <= 0)
 224             goto err;
 225         str = "modulus:";
 226         s = "publicExponent:";
 227     } else {
 228         if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len)
 229             <= 0)
 230             goto err;
 231         str = "Modulus:";
 232         s = "Exponent:";
 233     }
 234     if (!ASN1_bn_print(bp, str, x->n, m, off))
 235         goto err;
 236     if (!ASN1_bn_print(bp, s, x->e, m, off))
 237         goto err;
 238     if (priv) {
 239         if (!ASN1_bn_print(bp, "privateExponent:", x->d, m, off))
 240             goto err;
 241         if (!ASN1_bn_print(bp, "prime1:", x->p, m, off))
 242             goto err;
 243         if (!ASN1_bn_print(bp, "prime2:", x->q, m, off))
 244             goto err;
 245         if (!ASN1_bn_print(bp, "exponent1:", x->dmp1, m, off))
 246             goto err;
 247         if (!ASN1_bn_print(bp, "exponent2:", x->dmq1, m, off))
 248             goto err;
 249         if (!ASN1_bn_print(bp, "coefficient:", x->iqmp, m, off))
 250             goto err;
 251     }
 252     ret = 1;
 253  err:
 254     if (m != NULL)
 255         OPENSSL_free(m);
 256     return (ret);
 257 }
 258
 259 static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 260                          ASN1_PCTX *ctx)
 261 {
 262     return do_rsa_print(bp, pkey->pkey.rsa, indent, 0);
 263 }
 264
 265 static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 266                           ASN1_PCTX *ctx)
 267 {
 268     return do_rsa_print(bp, pkey->pkey.rsa, indent, 1);
 269 }
 270
 271 /* Given an MGF1 Algorithm ID decode to an Algorithm Identifier */
 272 static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg)
 273 {
 274     if (alg == NULL)
 275         return NULL;
 276     if (OBJ_obj2nid(alg->algorithm) != NID_mgf1)
 277         return NULL;
 278     return ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
 279                                      alg->parameter);
 280 }
 281
 282 static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg,
 283                                       X509_ALGOR **pmaskHash)
 284 {
 285     RSA_PSS_PARAMS *pss;
 286
 287     *pmaskHash = NULL;
 288
 289     pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_PSS_PARAMS),
 290                                     alg->parameter);
 291
 292     if (!pss)
 293         return NULL;
 294
 295     *pmaskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
 296
 297     return pss;
 298 }
 299
 300 static int rsa_pss_param_print(BIO *bp, RSA_PSS_PARAMS *pss,
 301                                X509_ALGOR *maskHash, int indent)
 302 {
 303     int rv = 0;
 304     if (!pss) {
 305         if (BIO_puts(bp, " (INVALID PSS PARAMETERS)\n") <= 0)
 306             return 0;
 307         return 1;
 308     }
 309     if (BIO_puts(bp, "\n") <= 0)
 310         goto err;
 311     if (!BIO_indent(bp, indent, 128))
 312         goto err;
 313     if (BIO_puts(bp, "Hash Algorithm: ") <= 0)
 314         goto err;
 315
 316     if (pss->hashAlgorithm) {
 317         if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0)
 318             goto err;
 319     } else if (BIO_puts(bp, "sha1 (default)") <= 0)
 320         goto err;
 321
 322     if (BIO_puts(bp, "\n") <= 0)
 323         goto err;
 324
 325     if (!BIO_indent(bp, indent, 128))
 326         goto err;
 327
 328     if (BIO_puts(bp, "Mask Algorithm: ") <= 0)
 329         goto err;
 330     if (pss->maskGenAlgorithm) {
 331         if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0)
 332             goto err;
 333         if (BIO_puts(bp, " with ") <= 0)
 334             goto err;
 335         if (maskHash) {
 336             if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0)
 337                 goto err;
 338         } else if (BIO_puts(bp, "INVALID") <= 0)
 339             goto err;
 340     } else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0)
 341         goto err;
 342     BIO_puts(bp, "\n");
 343
 344     if (!BIO_indent(bp, indent, 128))
 345         goto err;
 346     if (BIO_puts(bp, "Salt Length: 0x") <= 0)
 347         goto err;
 348     if (pss->saltLength) {
 349         if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0)
 350             goto err;
 351     } else if (BIO_puts(bp, "14 (default)") <= 0)
 352         goto err;
 353     BIO_puts(bp, "\n");
 354
 355     if (!BIO_indent(bp, indent, 128))
 356         goto err;
 357     if (BIO_puts(bp, "Trailer Field: 0x") <= 0)
 358         goto err;
 359     if (pss->trailerField) {
 360         if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0)
 361             goto err;
 362     } else if (BIO_puts(bp, "BC (default)") <= 0)
 363         goto err;
 364     BIO_puts(bp, "\n");
 365
 366     rv = 1;
 367
 368  err:
 369     return rv;
 370
 371 }
 372
 373 static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
 374                          const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
 375 {
 376     if (OBJ_obj2nid(sigalg->algorithm) == NID_rsassaPss) {
 377         int rv;
 378         RSA_PSS_PARAMS *pss;
 379         X509_ALGOR *maskHash;
 380         pss = rsa_pss_decode(sigalg, &maskHash);
 381         rv = rsa_pss_param_print(bp, pss, maskHash, indent);
 382         if (pss)
 383             RSA_PSS_PARAMS_free(pss);
 384         X509_ALGOR_free(maskHash);
 385         if (!rv)
 386             return 0;
 387     } else if (!sig && BIO_puts(bp, "\n") <= 0)
 388         return 0;
 389     if (sig)
 390         return X509_signature_dump(bp, sig, indent);
 391     return 1;
 392 }
 393
 394 static int rsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
 395 {
 396     X509_ALGOR *alg = NULL;
 397     switch (op) {
 398
 399     case ASN1_PKEY_CTRL_PKCS7_SIGN:
 400         if (arg1 == 0)
 401             PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, NULL, &alg);
 402         break;
 403
 404     case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
 405         if (arg1 == 0)
 406             PKCS7_RECIP_INFO_get0_alg(arg2, &alg);
 407         break;
 408 #ifndef OPENSSL_NO_CMS
 409     case ASN1_PKEY_CTRL_CMS_SIGN:
 410         if (arg1 == 0)
 411             return rsa_cms_sign(arg2);
 412         else if (arg1 == 1)
 413             return rsa_cms_verify(arg2);
 414         break;
 415
 416     case ASN1_PKEY_CTRL_CMS_ENVELOPE:
 417         if (arg1 == 0)
 418             return rsa_cms_encrypt(arg2);
 419         else if (arg1 == 1)
 420             return rsa_cms_decrypt(arg2);
 421         break;
 422
 423     case ASN1_PKEY_CTRL_CMS_RI_TYPE:
 424         *(int *)arg2 = CMS_RECIPINFO_TRANS;
 425         return 1;
 426 #endif
 427
 428     case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
 429         *(int *)arg2 = NID_sha256;
 430         return 1;
 431
 432     default:
 433         return -2;
 434
 435     }
 436
 437     if (alg)
 438         X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
 439
 440     return 1;
 441
 442 }
 443
 444 /* allocate and set algorithm ID from EVP_MD, default SHA1 */
 445 static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md)
 446 {
 447     if (EVP_MD_type(md) == NID_sha1)
 448         return 1;
 449     *palg = X509_ALGOR_new();
 450     if (!*palg)
 451         return 0;
 452     X509_ALGOR_set_md(*palg, md);
 453     return 1;
 454 }
 455
 456 /* Allocate and set MGF1 algorithm ID from EVP_MD */
 457 static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md)
 458 {
 459     X509_ALGOR *algtmp = NULL;
 460     ASN1_STRING *stmp = NULL;
 461     *palg = NULL;
 462     if (EVP_MD_type(mgf1md) == NID_sha1)
 463         return 1;
 464     /* need to embed algorithm ID inside another */
 465     if (!rsa_md_to_algor(&algtmp, mgf1md))
 466         goto err;
 467     if (!ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp))
 468          goto err;
 469     *palg = X509_ALGOR_new();
 470     if (!*palg)
 471         goto err;
 472     X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp);
 473     stmp = NULL;
 474  err:
 475     ASN1_STRING_free(stmp);
 476     X509_ALGOR_free(algtmp);
 477     if (*palg)
 478         return 1;
 479     return 0;
 480 }
 481
 482 /* convert algorithm ID to EVP_MD, default SHA1 */
 483 static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg)
 484 {
 485     const EVP_MD *md;
 486     if (!alg)
 487         return EVP_sha1();
 488     md = EVP_get_digestbyobj(alg->algorithm);
 489     if (md == NULL)
 490         RSAerr(RSA_F_RSA_ALGOR_TO_MD, RSA_R_UNKNOWN_DIGEST);
 491     return md;
 492 }
 493
 494 /* convert MGF1 algorithm ID to EVP_MD, default SHA1 */
 495 static const EVP_MD *rsa_mgf1_to_md(X509_ALGOR *alg, X509_ALGOR *maskHash)
 496 {
 497     const EVP_MD *md;
 498     if (!alg)
 499         return EVP_sha1();
 500     /* Check mask and lookup mask hash algorithm */
 501     if (OBJ_obj2nid(alg->algorithm) != NID_mgf1) {
 502         RSAerr(RSA_F_RSA_MGF1_TO_MD, RSA_R_UNSUPPORTED_MASK_ALGORITHM);
 503         return NULL;
 504     }
 505     if (!maskHash) {
 506         RSAerr(RSA_F_RSA_MGF1_TO_MD, RSA_R_UNSUPPORTED_MASK_PARAMETER);
 507         return NULL;
 508     }
 509     md = EVP_get_digestbyobj(maskHash->algorithm);
 510     if (md == NULL) {
 511         RSAerr(RSA_F_RSA_MGF1_TO_MD, RSA_R_UNKNOWN_MASK_DIGEST);
 512         return NULL;
 513     }
 514     return md;
 515 }
 516
 517 /*
 518  * Convert EVP_PKEY_CTX is PSS mode into corresponding algorithm parameter,
 519  * suitable for setting an AlgorithmIdentifier.
 520  */
 521
 522 static ASN1_STRING *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx)
 523 {
 524     const EVP_MD *sigmd, *mgf1md;
 525     RSA_PSS_PARAMS *pss = NULL;
 526     ASN1_STRING *os = NULL;
 527     EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx);
 528     int saltlen, rv = 0;
 529     if (EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) <= 0)
 530         goto err;
 531     if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
 532         goto err;
 533     if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen))
 534         goto err;
 535     if (saltlen == -1)
 536         saltlen = EVP_MD_size(sigmd);
 537     else if (saltlen == -2) {
 538         saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
 539         if (((EVP_PKEY_bits(pk) - 1) & 0x7) == 0)
 540             saltlen--;
 541     }
 542     pss = RSA_PSS_PARAMS_new();
 543     if (!pss)
 544         goto err;
 545     if (saltlen != 20) {
 546         pss->saltLength = ASN1_INTEGER_new();
 547         if (!pss->saltLength)
 548             goto err;
 549         if (!ASN1_INTEGER_set(pss->saltLength, saltlen))
 550             goto err;
 551     }
 552     if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd))
 553         goto err;
 554     if (!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md))
 555         goto err;
 556     /* Finally create string with pss parameter encoding. */
 557     if (!ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), &os))
 558          goto err;
 559     rv = 1;
 560  err:
 561     if (pss)
 562         RSA_PSS_PARAMS_free(pss);
 563     if (rv)
 564         return os;
 565     ASN1_STRING_free(os);
 566     return NULL;
 567 }
 568
 569 /*
 570  * From PSS AlgorithmIdentifier set public key parameters. If pkey isn't NULL
 571  * then the EVP_MD_CTX is setup and initalised. If it is NULL parameters are
 572  * passed to pkctx instead.
 573  */
 574
 575 static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx,
 576                           X509_ALGOR *sigalg, EVP_PKEY *pkey)
 577 {
 578     int rv = -1;
 579     int saltlen;
 580     const EVP_MD *mgf1md = NULL, *md = NULL;
 581     RSA_PSS_PARAMS *pss;
 582     X509_ALGOR *maskHash;
 583     /* Sanity check: make sure it is PSS */
 584     if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss) {
 585         RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
 586         return -1;
 587     }
 588     /* Decode PSS parameters */
 589     pss = rsa_pss_decode(sigalg, &maskHash);
 590
 591     if (pss == NULL) {
 592         RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_PSS_PARAMETERS);
 593         goto err;
 594     }
 595     mgf1md = rsa_mgf1_to_md(pss->maskGenAlgorithm, maskHash);
 596     if (!mgf1md)
 597         goto err;
 598     md = rsa_algor_to_md(pss->hashAlgorithm);
 599     if (!md)
 600         goto err;
 601
 602     if (pss->saltLength) {
 603         saltlen = ASN1_INTEGER_get(pss->saltLength);
 604
 605         /*
 606          * Could perform more salt length sanity checks but the main RSA
 607          * routines will trap other invalid values anyway.
 608          */
 609         if (saltlen < 0) {
 610             RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_SALT_LENGTH);
 611             goto err;
 612         }
 613     } else
 614         saltlen = 20;
 615
 616     /*
 617      * low-level routines support only trailer field 0xbc (value 1) and
 618      * PKCS#1 says we should reject any other value anyway.
 619      */
 620     if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) {
 621         RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_TRAILER);
 622         goto err;
 623     }
 624
 625     /* We have all parameters now set up context */
 626
 627     if (pkey) {
 628         if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey))
 629             goto err;
 630     } else {
 631         const EVP_MD *checkmd;
 632         if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0)
 633             goto err;
 634         if (EVP_MD_type(md) != EVP_MD_type(checkmd)) {
 635             RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_DIGEST_DOES_NOT_MATCH);
 636             goto err;
 637         }
 638     }
 639
 640     if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0)
 641         goto err;
 642
 643     if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0)
 644         goto err;
 645
 646     if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
 647         goto err;
 648     /* Carry on */
 649     rv = 1;
 650
 651  err:
 652     RSA_PSS_PARAMS_free(pss);
 653     X509_ALGOR_free(maskHash);
 654     return rv;
 655 }
 656
 657 static int rsa_cms_verify(CMS_SignerInfo *si)
 658 {
 659     int nid, nid2;
 660     X509_ALGOR *alg;
 661     EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
 662     CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
 663     nid = OBJ_obj2nid(alg->algorithm);
 664     if (nid == NID_rsaEncryption)
 665         return 1;
 666     if (nid == NID_rsassaPss)
 667         return rsa_pss_to_ctx(NULL, pkctx, alg, NULL);
 668     /* Workaround for some implementation that use a signature OID */
 669     if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
 670         if (nid2 == NID_rsaEncryption)
 671             return 1;
 672     }
 673     return 0;
 674 }
 675
 676 /*
 677  * Customised RSA item verification routine. This is called when a signature
 678  * is encountered requiring special handling. We currently only handle PSS.
 679  */
 680
 681 static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
 682                            X509_ALGOR *sigalg, ASN1_BIT_STRING *sig,
 683                            EVP_PKEY *pkey)
 684 {
 685     /* Sanity check: make sure it is PSS */
 686     if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss) {
 687         RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
 688         return -1;
 689     }
 690     if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) {
 691         /* Carry on */
 692         return 2;
 693     }
 694     return -1;
 695 }
 696
 697 static int rsa_cms_sign(CMS_SignerInfo *si)
 698 {
 699     int pad_mode = RSA_PKCS1_PADDING;
 700     X509_ALGOR *alg;
 701     EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
 702     ASN1_STRING *os = NULL;
 703     CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
 704     if (pkctx) {
 705         if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
 706             return 0;
 707     }
 708     if (pad_mode == RSA_PKCS1_PADDING) {
 709         X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
 710         return 1;
 711     }
 712     /* We don't support it */
 713     if (pad_mode != RSA_PKCS1_PSS_PADDING)
 714         return 0;
 715     os = rsa_ctx_to_pss(pkctx);
 716     if (!os)
 717         return 0;
 718     X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsassaPss), V_ASN1_SEQUENCE, os);
 719     return 1;
 720 }
 721
 722 static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
 723                          X509_ALGOR *alg1, X509_ALGOR *alg2,
 724                          ASN1_BIT_STRING *sig)
 725 {
 726     int pad_mode;
 727     EVP_PKEY_CTX *pkctx = ctx->pctx;
 728     if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
 729         return 0;
 730     if (pad_mode == RSA_PKCS1_PADDING)
 731         return 2;
 732     if (pad_mode == RSA_PKCS1_PSS_PADDING) {
 733         ASN1_STRING *os1 = NULL;
 734         os1 = rsa_ctx_to_pss(pkctx);
 735         if (!os1)
 736             return 0;
 737         /* Duplicate parameters if we have to */
 738         if (alg2) {
 739             ASN1_STRING *os2 = ASN1_STRING_dup(os1);
 740             if (!os2) {
 741                 ASN1_STRING_free(os1);
 742                 return 0;
 743             }
 744             X509_ALGOR_set0(alg2, OBJ_nid2obj(NID_rsassaPss),
 745                             V_ASN1_SEQUENCE, os2);
 746         }
 747         X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_rsassaPss),
 748                         V_ASN1_SEQUENCE, os1);
 749         return 3;
 750     }
 751     return 2;
 752 }
 753
 754 static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg,
 755                                         X509_ALGOR **pmaskHash)
 756 {
 757     RSA_OAEP_PARAMS *pss;
 758
 759     *pmaskHash = NULL;
 760
 761     pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS),
 762                                     alg->parameter);
 763
 764     if (!pss)
 765         return NULL;
 766
 767     *pmaskHash = rsa_mgf1_decode(pss->maskGenFunc);
 768
 769     return pss;
 770 }
 771
 772 static int rsa_cms_decrypt(CMS_RecipientInfo *ri)
 773 {
 774     EVP_PKEY_CTX *pkctx;
 775     X509_ALGOR *cmsalg;
 776     int nid;
 777     int rv = -1;
 778     unsigned char *label = NULL;
 779     int labellen = 0;
 780     const EVP_MD *mgf1md = NULL, *md = NULL;
 781     RSA_OAEP_PARAMS *oaep;
 782     X509_ALGOR *maskHash;
 783     pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
 784     if (!pkctx)
 785         return 0;
 786     if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
 787         return -1;
 788     nid = OBJ_obj2nid(cmsalg->algorithm);
 789     if (nid == NID_rsaEncryption)
 790         return 1;
 791     if (nid != NID_rsaesOaep) {
 792         RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_ENCRYPTION_TYPE);
 793         return -1;
 794     }
 795     /* Decode OAEP parameters */
 796     oaep = rsa_oaep_decode(cmsalg, &maskHash);
 797
 798     if (oaep == NULL) {
 799         RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_OAEP_PARAMETERS);
 800         goto err;
 801     }
 802
 803     mgf1md = rsa_mgf1_to_md(oaep->maskGenFunc, maskHash);
 804     if (!mgf1md)
 805         goto err;
 806     md = rsa_algor_to_md(oaep->hashFunc);
 807     if (!md)
 808         goto err;
 809
 810     if (oaep->pSourceFunc) {
 811         X509_ALGOR *plab = oaep->pSourceFunc;
 812         if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
 813             RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_LABEL_SOURCE);
 814             goto err;
 815         }
 816         if (plab->parameter->type != V_ASN1_OCTET_STRING) {
 817             RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_LABEL);
 818             goto err;
 819         }
 820
 821         label = plab->parameter->value.octet_string->data;
 822         /* Stop label being freed when OAEP parameters are freed */
 823         plab->parameter->value.octet_string->data = NULL;
 824         labellen = plab->parameter->value.octet_string->length;
 825     }
 826
 827     if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
 828         goto err;
 829     if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
 830         goto err;
 831     if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
 832         goto err;
 833     if (EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
 834         goto err;
 835     /* Carry on */
 836     rv = 1;
 837
 838  err:
 839     RSA_OAEP_PARAMS_free(oaep);
 840     X509_ALGOR_free(maskHash);
 841     return rv;
 842 }
 843
 844 static int rsa_cms_encrypt(CMS_RecipientInfo *ri)
 845 {
 846     const EVP_MD *md, *mgf1md;
 847     RSA_OAEP_PARAMS *oaep = NULL;
 848     ASN1_STRING *os = NULL;
 849     X509_ALGOR *alg;
 850     EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
 851     int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen;
 852     unsigned char *label;
 853     CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg);
 854     if (pkctx) {
 855         if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
 856             return 0;
 857     }
 858     if (pad_mode == RSA_PKCS1_PADDING) {
 859         X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
 860         return 1;
 861     }
 862     /* Not supported */
 863     if (pad_mode != RSA_PKCS1_OAEP_PADDING)
 864         return 0;
 865     if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0)
 866         goto err;
 867     if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
 868         goto err;
 869     labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label);
 870     if (labellen < 0)
 871         goto err;
 872     oaep = RSA_OAEP_PARAMS_new();
 873     if (!oaep)
 874         goto err;
 875     if (!rsa_md_to_algor(&oaep->hashFunc, md))
 876         goto err;
 877     if (!rsa_md_to_mgf1(&oaep->maskGenFunc, mgf1md))
 878         goto err;
 879     if (labellen > 0) {
 880         ASN1_OCTET_STRING *los = ASN1_OCTET_STRING_new();
 881         oaep->pSourceFunc = X509_ALGOR_new();
 882         if (!oaep->pSourceFunc)
 883             goto err;
 884         if (!los)
 885             goto err;
 886         if (!ASN1_OCTET_STRING_set(los, label, labellen)) {
 887             ASN1_OCTET_STRING_free(los);
 888             goto err;
 889         }
 890         X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified),
 891                         V_ASN1_OCTET_STRING, los);
 892     }
 893     /* create string with pss parameter encoding. */
 894     if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os))
 895          goto err;
 896     X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os);
 897     os = NULL;
 898     rv = 1;
 899  err:
 900     if (oaep)
 901         RSA_OAEP_PARAMS_free(oaep);
 902     ASN1_STRING_free(os);
 903     return rv;
 904 }
 905
 906 const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[] = {
 907     {
 908      EVP_PKEY_RSA,
 909      EVP_PKEY_RSA,
 910      ASN1_PKEY_SIGPARAM_NULL,
 911
 912      "RSA",
 913      "OpenSSL RSA method",
 914
 915      rsa_pub_decode,
 916      rsa_pub_encode,
 917      rsa_pub_cmp,
 918      rsa_pub_print,
 919
 920      rsa_priv_decode,
 921      rsa_priv_encode,
 922      rsa_priv_print,
 923
 924      int_rsa_size,
 925      rsa_bits,
 926      rsa_security_bits,
 927
 928      0, 0, 0, 0, 0, 0,
 929
 930      rsa_sig_print,
 931      int_rsa_free,
 932      rsa_pkey_ctrl,
 933      old_rsa_priv_decode,
 934      old_rsa_priv_encode,
 935      rsa_item_verify,
 936      rsa_item_sign},
 937
 938     {
 939      EVP_PKEY_RSA2,
 940      EVP_PKEY_RSA,
 941      ASN1_PKEY_ALIAS}
 942 };