crypto/openssl/crypto/rsa/rsa_ameth.c

   1 /* crypto/rsa/rsa_ameth.c */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project 2006.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include <openssl/asn1t.h>
  62 #include <openssl/x509.h>
  63 #include <openssl/rsa.h>
  64 #include <openssl/bn.h>
  65 #ifndef OPENSSL_NO_CMS
  66 #include <openssl/cms.h>
  67 #endif
  68 #include "asn1_locl.h"
  69
  70 static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
  71         {
  72         unsigned char *penc = NULL;
  73         int penclen;
  74         penclen = i2d_RSAPublicKey(pkey->pkey.rsa, &penc);
  75         if (penclen <= 0)
  76                 return 0;
  77         if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_RSA),
  78                                 V_ASN1_NULL, NULL, penc, penclen))
  79                 return 1;
  80
  81         OPENSSL_free(penc);
  82         return 0;
  83         }
  84
  85 static int rsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
  86         {
  87         const unsigned char *p;
  88         int pklen;
  89         RSA *rsa = NULL;
  90         if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, NULL, pubkey))
  91                 return 0;
  92         if (!(rsa = d2i_RSAPublicKey(NULL, &p, pklen)))
  93                 {
  94                 RSAerr(RSA_F_RSA_PUB_DECODE, ERR_R_RSA_LIB);
  95                 return 0;
  96                 }
  97         EVP_PKEY_assign_RSA (pkey, rsa);
  98         return 1;
  99         }
 100
 101 static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 102         {
 103         if (BN_cmp(b->pkey.rsa->n,a->pkey.rsa->n) != 0
 104                 || BN_cmp(b->pkey.rsa->e,a->pkey.rsa->e) != 0)
 105                         return 0;
 106         return 1;
 107         }
 108
 109 static int old_rsa_priv_decode(EVP_PKEY *pkey,
 110                                         const unsigned char **pder, int derlen)
 111         {
 112         RSA *rsa;
 113         if (!(rsa = d2i_RSAPrivateKey (NULL, pder, derlen)))
 114                 {
 115                 RSAerr(RSA_F_OLD_RSA_PRIV_DECODE, ERR_R_RSA_LIB);
 116                 return 0;
 117                 }
 118         EVP_PKEY_assign_RSA(pkey, rsa);
 119         return 1;
 120         }
 121
 122 static int old_rsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
 123         {
 124         return i2d_RSAPrivateKey(pkey->pkey.rsa, pder);
 125         }
 126
 127 static int rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
 128         {
 129         unsigned char *rk = NULL;
 130         int rklen;
 131         rklen = i2d_RSAPrivateKey(pkey->pkey.rsa, &rk);
 132
 133         if (rklen <= 0)
 134                 {
 135                 RSAerr(RSA_F_RSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 136                 return 0;
 137                 }
 138
 139         if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_rsaEncryption), 0,
 140                                 V_ASN1_NULL, NULL, rk, rklen))
 141                 {
 142                 RSAerr(RSA_F_RSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
 143                 return 0;
 144                 }
 145
 146         return 1;
 147         }
 148
 149 static int rsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
 150         {
 151         const unsigned char *p;
 152         int pklen;
 153         if (!PKCS8_pkey_get0(NULL, &p, &pklen, NULL, p8))
 154                 return 0;
 155         return old_rsa_priv_decode(pkey, &p, pklen);
 156         }
 157
 158 static int int_rsa_size(const EVP_PKEY *pkey)
 159         {
 160         return RSA_size(pkey->pkey.rsa);
 161         }
 162
 163 static int rsa_bits(const EVP_PKEY *pkey)
 164         {
 165         return BN_num_bits(pkey->pkey.rsa->n);
 166         }
 167
 168 static void int_rsa_free(EVP_PKEY *pkey)
 169         {
 170         RSA_free(pkey->pkey.rsa);
 171         }
 172
 173
 174 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
 175         {
 176         size_t i;
 177         if (!b)
 178                 return;
 179         if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
 180                         *pbuflen = i;
 181         }
 182
 183 static int do_rsa_print(BIO *bp, const RSA *x, int off, int priv)
 184         {
 185         char *str;
 186         const char *s;
 187         unsigned char *m=NULL;
 188         int ret=0, mod_len = 0;
 189         size_t buf_len=0;
 190
 191         update_buflen(x->n, &buf_len);
 192         update_buflen(x->e, &buf_len);
 193
 194         if (priv)
 195                 {
 196                 update_buflen(x->d, &buf_len);
 197                 update_buflen(x->p, &buf_len);
 198                 update_buflen(x->q, &buf_len);
 199                 update_buflen(x->dmp1, &buf_len);
 200                 update_buflen(x->dmq1, &buf_len);
 201                 update_buflen(x->iqmp, &buf_len);
 202                 }
 203
 204         m=(unsigned char *)OPENSSL_malloc(buf_len+10);
 205         if (m == NULL)
 206                 {
 207                 RSAerr(RSA_F_DO_RSA_PRINT,ERR_R_MALLOC_FAILURE);
 208                 goto err;
 209                 }
 210
 211         if (x->n != NULL)
 212                 mod_len = BN_num_bits(x->n);
 213
 214         if(!BIO_indent(bp,off,128))
 215                 goto err;
 216
 217         if (priv && x->d)
 218                 {
 219                 if (BIO_printf(bp,"Private-Key: (%d bit)\n", mod_len)
 220                         <= 0) goto err;
 221                 str = "modulus:";
 222                 s = "publicExponent:";
 223                 }
 224         else
 225                 {
 226                 if (BIO_printf(bp,"Public-Key: (%d bit)\n", mod_len)
 227                         <= 0) goto err;
 228                 str = "Modulus:";
 229                 s= "Exponent:";
 230                 }
 231         if (!ASN1_bn_print(bp,str,x->n,m,off)) goto err;
 232         if (!ASN1_bn_print(bp,s,x->e,m,off))
 233                 goto err;
 234         if (priv)
 235                 {
 236                 if (!ASN1_bn_print(bp,"privateExponent:",x->d,m,off))
 237                         goto err;
 238                 if (!ASN1_bn_print(bp,"prime1:",x->p,m,off))
 239                         goto err;
 240                 if (!ASN1_bn_print(bp,"prime2:",x->q,m,off))
 241                         goto err;
 242                 if (!ASN1_bn_print(bp,"exponent1:",x->dmp1,m,off))
 243                         goto err;
 244                 if (!ASN1_bn_print(bp,"exponent2:",x->dmq1,m,off))
 245                         goto err;
 246                 if (!ASN1_bn_print(bp,"coefficient:",x->iqmp,m,off))
 247                         goto err;
 248                 }
 249         ret=1;
 250 err:
 251         if (m != NULL) OPENSSL_free(m);
 252         return(ret);
 253         }
 254
 255 static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 256                                                         ASN1_PCTX *ctx)
 257         {
 258         return do_rsa_print(bp, pkey->pkey.rsa, indent, 0);
 259         }
 260
 261
 262 static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 263                                                         ASN1_PCTX *ctx)
 264         {
 265         return do_rsa_print(bp, pkey->pkey.rsa, indent, 1);
 266         }
 267
 268 static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg,
 269                                         X509_ALGOR **pmaskHash)
 270         {
 271         const unsigned char *p;
 272         int plen;
 273         RSA_PSS_PARAMS *pss;
 274
 275         *pmaskHash = NULL;
 276
 277         if (!alg->parameter || alg->parameter->type != V_ASN1_SEQUENCE)
 278                 return NULL;
 279         p = alg->parameter->value.sequence->data;
 280         plen = alg->parameter->value.sequence->length;
 281         pss = d2i_RSA_PSS_PARAMS(NULL, &p, plen);
 282
 283         if (!pss)
 284                 return NULL;
 285
 286         if (pss->maskGenAlgorithm)
 287                 {
 288                 ASN1_TYPE *param = pss->maskGenAlgorithm->parameter;
 289                 if (OBJ_obj2nid(pss->maskGenAlgorithm->algorithm) == NID_mgf1
 290                         && param->type == V_ASN1_SEQUENCE)
 291                         {
 292                         p = param->value.sequence->data;
 293                         plen = param->value.sequence->length;
 294                         *pmaskHash = d2i_X509_ALGOR(NULL, &p, plen);
 295                         }
 296                 }
 297
 298         return pss;
 299         }
 300
 301 static int rsa_pss_param_print(BIO *bp, RSA_PSS_PARAMS *pss,
 302                                 X509_ALGOR *maskHash, int indent)
 303         {
 304         int rv = 0;
 305         if (!pss)
 306                 {
 307                 if (BIO_puts(bp, " (INVALID PSS PARAMETERS)\n") <= 0)
 308                         return 0;
 309                 return 1;
 310                 }
 311         if (BIO_puts(bp, "\n") <= 0)
 312                 goto err;
 313         if (!BIO_indent(bp, indent, 128))
 314                 goto err;
 315         if (BIO_puts(bp, "Hash Algorithm: ") <= 0)
 316                 goto err;
 317
 318         if (pss->hashAlgorithm)
 319                 {
 320                 if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0)
 321                         goto err;
 322                 }
 323         else if (BIO_puts(bp, "sha1 (default)") <= 0)
 324                 goto err;
 325
 326         if (BIO_puts(bp, "\n") <= 0)
 327                 goto err;
 328
 329         if (!BIO_indent(bp, indent, 128))
 330                 goto err;
 331
 332         if (BIO_puts(bp, "Mask Algorithm: ") <= 0)
 333                         goto err;
 334         if (pss->maskGenAlgorithm)
 335                 {
 336                 if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0)
 337                         goto err;
 338                 if (BIO_puts(bp, " with ") <= 0)
 339                         goto err;
 340                 if (maskHash)
 341                         {
 342                         if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0)
 343                         goto err;
 344                         }
 345                 else if (BIO_puts(bp, "INVALID") <= 0)
 346                         goto err;
 347                 }
 348         else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0)
 349                 goto err;
 350         BIO_puts(bp, "\n");
 351
 352         if (!BIO_indent(bp, indent, 128))
 353                 goto err;
 354         if (BIO_puts(bp, "Salt Length: 0x") <= 0)
 355                         goto err;
 356         if (pss->saltLength)
 357                 {
 358                 if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0)
 359                         goto err;
 360                 }
 361         else if (BIO_puts(bp, "0x14 (default)") <= 0)
 362                 goto err;
 363         BIO_puts(bp, "\n");
 364
 365         if (!BIO_indent(bp, indent, 128))
 366                 goto err;
 367         if (BIO_puts(bp, "Trailer Field: 0x") <= 0)
 368                         goto err;
 369         if (pss->trailerField)
 370                 {
 371                 if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0)
 372                         goto err;
 373                 }
 374         else if (BIO_puts(bp, "BC (default)") <= 0)
 375                 goto err;
 376         BIO_puts(bp, "\n");
 377
 378         rv = 1;
 379
 380         err:
 381         return rv;
 382
 383         }
 384
 385 static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
 386                                         const ASN1_STRING *sig,
 387                                         int indent, ASN1_PCTX *pctx)
 388         {
 389         if (OBJ_obj2nid(sigalg->algorithm) == NID_rsassaPss)
 390                 {
 391                 int rv;
 392                 RSA_PSS_PARAMS *pss;
 393                 X509_ALGOR *maskHash;
 394                 pss = rsa_pss_decode(sigalg, &maskHash);
 395                 rv = rsa_pss_param_print(bp, pss, maskHash, indent);
 396                 if (pss)
 397                         RSA_PSS_PARAMS_free(pss);
 398                 if (maskHash)
 399                         X509_ALGOR_free(maskHash);
 400                 if (!rv)
 401                         return 0;
 402                 }
 403         else if (!sig && BIO_puts(bp, "\n") <= 0)
 404                 return 0;
 405         if (sig)
 406                 return X509_signature_dump(bp, sig, indent);
 407         return 1;
 408         }
 409
 410 static int rsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
 411         {
 412         X509_ALGOR *alg = NULL;
 413         switch (op)
 414                 {
 415
 416                 case ASN1_PKEY_CTRL_PKCS7_SIGN:
 417                 if (arg1 == 0)
 418                         PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, NULL, &alg);
 419                 break;
 420
 421                 case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
 422                 if (arg1 == 0)
 423                         PKCS7_RECIP_INFO_get0_alg(arg2, &alg);
 424                 break;
 425 #ifndef OPENSSL_NO_CMS
 426                 case ASN1_PKEY_CTRL_CMS_SIGN:
 427                 if (arg1 == 0)
 428                         CMS_SignerInfo_get0_algs(arg2, NULL, NULL, NULL, &alg);
 429                 break;
 430
 431                 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
 432                 if (arg1 == 0)
 433                         CMS_RecipientInfo_ktri_get0_algs(arg2, NULL, NULL, &alg);
 434                 break;
 435 #endif
 436
 437                 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
 438                 *(int *)arg2 = NID_sha1;
 439                 return 1;
 440
 441                 default:
 442                 return -2;
 443
 444                 }
 445
 446         if (alg)
 447                 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption),
 448                                                         V_ASN1_NULL, 0);
 449
 450         return 1;
 451
 452         }
 453
 454 /* Customised RSA item verification routine. This is called
 455  * when a signature is encountered requiring special handling. We
 456  * currently only handle PSS.
 457  */
 458
 459
 460 static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
 461                         X509_ALGOR *sigalg, ASN1_BIT_STRING *sig,
 462                         EVP_PKEY *pkey)
 463         {
 464         int rv = -1;
 465         int saltlen;
 466         const EVP_MD *mgf1md = NULL, *md = NULL;
 467         RSA_PSS_PARAMS *pss;
 468         X509_ALGOR *maskHash;
 469         EVP_PKEY_CTX *pkctx;
 470         /* Sanity check: make sure it is PSS */
 471         if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss)
 472                 {
 473                 RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
 474                 return -1;
 475                 }
 476         /* Decode PSS parameters */
 477         pss = rsa_pss_decode(sigalg, &maskHash);
 478
 479         if (pss == NULL)
 480                 {
 481                 RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_INVALID_PSS_PARAMETERS);
 482                 goto err;
 483                 }
 484         /* Check mask and lookup mask hash algorithm */
 485         if (pss->maskGenAlgorithm)
 486                 {
 487                 if (OBJ_obj2nid(pss->maskGenAlgorithm->algorithm) != NID_mgf1)
 488                         {
 489                         RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_MASK_ALGORITHM);
 490                         goto err;
 491                         }
 492                 if (!maskHash)
 493                         {
 494                         RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_MASK_PARAMETER);
 495                         goto err;
 496                         }
 497                 mgf1md = EVP_get_digestbyobj(maskHash->algorithm);
 498                 if (mgf1md == NULL)
 499                         {
 500                         RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNKNOWN_MASK_DIGEST);
 501                         goto err;
 502                         }
 503                 }
 504         else
 505                 mgf1md = EVP_sha1();
 506
 507         if (pss->hashAlgorithm)
 508                 {
 509                 md = EVP_get_digestbyobj(pss->hashAlgorithm->algorithm);
 510                 if (md == NULL)
 511                         {
 512                         RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNKNOWN_PSS_DIGEST);
 513                         goto err;
 514                         }
 515                 }
 516         else
 517                 md = EVP_sha1();
 518
 519         if (pss->saltLength)
 520                 {
 521                 saltlen = ASN1_INTEGER_get(pss->saltLength);
 522
 523                 /* Could perform more salt length sanity checks but the main
 524                  * RSA routines will trap other invalid values anyway.
 525                  */
 526                 if (saltlen < 0)
 527                         {
 528                         RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_INVALID_SALT_LENGTH);
 529                         goto err;
 530                         }
 531                 }
 532         else
 533                 saltlen = 20;
 534
 535         /* low-level routines support only trailer field 0xbc (value 1)
 536          * and PKCS#1 says we should reject any other value anyway.
 537          */
 538         if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1)
 539                 {
 540                 RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_INVALID_TRAILER);
 541                 goto err;
 542                 }
 543
 544         /* We have all parameters now set up context */
 545
 546         if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey))
 547                 goto err;
 548
 549         if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0)
 550                 goto err;
 551
 552         if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0)
 553                 goto err;
 554
 555         if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
 556                 goto err;
 557         /* Carry on */
 558         rv = 2;
 559
 560         err:
 561         RSA_PSS_PARAMS_free(pss);
 562         if (maskHash)
 563                 X509_ALGOR_free(maskHash);
 564         return rv;
 565         }
 566
 567 static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
 568                                 X509_ALGOR *alg1, X509_ALGOR *alg2,
 569                                 ASN1_BIT_STRING *sig)
 570         {
 571         int pad_mode;
 572         EVP_PKEY_CTX *pkctx = ctx->pctx;
 573         if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
 574                 return 0;
 575         if (pad_mode == RSA_PKCS1_PADDING)
 576                 return 2;
 577         if (pad_mode == RSA_PKCS1_PSS_PADDING)
 578                 {
 579                 const EVP_MD *sigmd, *mgf1md;
 580                 RSA_PSS_PARAMS *pss = NULL;
 581                 X509_ALGOR *mgf1alg = NULL;
 582                 ASN1_STRING *os1 = NULL, *os2 = NULL;
 583                 EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx);
 584                 int saltlen, rv = 0;
 585                 sigmd = EVP_MD_CTX_md(ctx);
 586                 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
 587                         goto err;
 588                 if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen))
 589                         goto err;
 590                 if (saltlen == -1)
 591                         saltlen = EVP_MD_size(sigmd);
 592                 else if (saltlen == -2)
 593                         {
 594                         saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
 595                         if (((EVP_PKEY_bits(pk) - 1) & 0x7) == 0)
 596                                 saltlen--;
 597                         }
 598                 pss = RSA_PSS_PARAMS_new();
 599                 if (!pss)
 600                         goto err;
 601                 if (saltlen != 20)
 602                         {
 603                         pss->saltLength = ASN1_INTEGER_new();
 604                         if (!pss->saltLength)
 605                                 goto err;
 606                         if (!ASN1_INTEGER_set(pss->saltLength, saltlen))
 607                                 goto err;
 608                         }
 609                 if (EVP_MD_type(sigmd) != NID_sha1)
 610                         {
 611                         pss->hashAlgorithm = X509_ALGOR_new();
 612                         if (!pss->hashAlgorithm)
 613                                 goto err;
 614                         X509_ALGOR_set_md(pss->hashAlgorithm, sigmd);
 615                         }
 616                 if (EVP_MD_type(mgf1md) != NID_sha1)
 617                         {
 618                         ASN1_STRING *stmp = NULL;
 619                         /* need to embed algorithm ID inside another */
 620                         mgf1alg = X509_ALGOR_new();
 621                         X509_ALGOR_set_md(mgf1alg, mgf1md);
 622                         if (!ASN1_item_pack(mgf1alg, ASN1_ITEM_rptr(X509_ALGOR),
 623                                                                         &stmp))
 624                                         goto err;
 625                         pss->maskGenAlgorithm = X509_ALGOR_new();
 626                         if (!pss->maskGenAlgorithm)
 627                                 goto err;
 628                         X509_ALGOR_set0(pss->maskGenAlgorithm,
 629                                         OBJ_nid2obj(NID_mgf1),
 630                                         V_ASN1_SEQUENCE, stmp);
 631                         }
 632                 /* Finally create string with pss parameter encoding. */
 633                 if (!ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), &os1))
 634                         goto err;
 635                 if (alg2)
 636                         {
 637                         os2 = ASN1_STRING_dup(os1);
 638                         if (!os2)
 639                                 goto err;
 640                         X509_ALGOR_set0(alg2, OBJ_nid2obj(NID_rsassaPss),
 641                                                 V_ASN1_SEQUENCE, os2);
 642                         }
 643                 X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_rsassaPss),
 644                                         V_ASN1_SEQUENCE, os1);
 645                 os1 = os2 = NULL;
 646                 rv = 3;
 647                 err:
 648                 if (mgf1alg)
 649                         X509_ALGOR_free(mgf1alg);
 650                 if (pss)
 651                         RSA_PSS_PARAMS_free(pss);
 652                 if (os1)
 653                         ASN1_STRING_free(os1);
 654                 return rv;
 655
 656                 }
 657         return 2;
 658         }
 659
 660 const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[] =
 661         {
 662                 {
 663                 EVP_PKEY_RSA,
 664                 EVP_PKEY_RSA,
 665                 ASN1_PKEY_SIGPARAM_NULL,
 666
 667                 "RSA",
 668                 "OpenSSL RSA method",
 669
 670                 rsa_pub_decode,
 671                 rsa_pub_encode,
 672                 rsa_pub_cmp,
 673                 rsa_pub_print,
 674
 675                 rsa_priv_decode,
 676                 rsa_priv_encode,
 677                 rsa_priv_print,
 678
 679                 int_rsa_size,
 680                 rsa_bits,
 681
 682                 0,0,0,0,0,0,
 683
 684                 rsa_sig_print,
 685                 int_rsa_free,
 686                 rsa_pkey_ctrl,
 687                 old_rsa_priv_decode,
 688                 old_rsa_priv_encode,
 689                 rsa_item_verify,
 690                 rsa_item_sign
 691                 },
 692
 693                 {
 694                 EVP_PKEY_RSA2,
 695                 EVP_PKEY_RSA,
 696                 ASN1_PKEY_ALIAS
 697                 }
 698         };