crypto/rsa/rsa_pmeth.c

   1 /* crypto/rsa/rsa_pmeth.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 #include <openssl/evp.h>
  66 #include <openssl/x509v3.h>
  67 #ifndef OPENSSL_NO_CMS
  68 #include <openssl/cms.h>
  69 #endif
  70 #include "evp_locl.h"
  71 #include "rsa_locl.h"
  72
  73 /* RSA pkey context structure */
  74
  75 typedef struct
  76         {
  77         /* Key gen parameters */
  78         int nbits;
  79         BIGNUM *pub_exp;
  80         /* Keygen callback info */
  81         int gentmp[2];
  82         /* RSA padding mode */
  83         int pad_mode;
  84         /* message digest */
  85         const EVP_MD *md;
  86         /* message digest for MGF1 */
  87         const EVP_MD *mgf1md;
  88         /* PSS salt length */
  89         int saltlen;
  90         /* Temp buffer */
  91         unsigned char *tbuf;
  92         /* OAEP label */
  93         unsigned char *oaep_label;
  94         size_t oaep_labellen;
  95         } RSA_PKEY_CTX;
  96
  97 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
  98         {
  99         RSA_PKEY_CTX *rctx;
 100         rctx = OPENSSL_malloc(sizeof(RSA_PKEY_CTX));
 101         if (!rctx)
 102                 return 0;
 103         rctx->nbits = 1024;
 104         rctx->pub_exp = NULL;
 105         rctx->pad_mode = RSA_PKCS1_PADDING;
 106         rctx->md = NULL;
 107         rctx->mgf1md = NULL;
 108         rctx->tbuf = NULL;
 109
 110         rctx->saltlen = -2;
 111
 112         rctx->oaep_label = NULL;
 113         rctx->oaep_labellen = 0;
 114
 115         ctx->data = rctx;
 116         ctx->keygen_info = rctx->gentmp;
 117         ctx->keygen_info_count = 2;
 118
 119         return 1;
 120         }
 121
 122 static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
 123         {
 124         RSA_PKEY_CTX *dctx, *sctx;
 125         if (!pkey_rsa_init(dst))
 126                 return 0;
 127         sctx = src->data;
 128         dctx = dst->data;
 129         dctx->nbits = sctx->nbits;
 130         if (sctx->pub_exp)
 131                 {
 132                 dctx->pub_exp = BN_dup(sctx->pub_exp);
 133                 if (!dctx->pub_exp)
 134                         return 0;
 135                 }
 136         dctx->pad_mode = sctx->pad_mode;
 137         dctx->md = sctx->md;
 138         dctx->mgf1md = sctx->mgf1md;
 139         if (sctx->oaep_label)
 140                 {
 141                 if (dctx->oaep_label)
 142                         OPENSSL_free(dctx->oaep_label);
 143                 dctx->oaep_label = BUF_memdup(sctx->oaep_label,
 144                                                 sctx->oaep_labellen);
 145                 if (!dctx->oaep_label)
 146                         return 0;
 147                 dctx->oaep_labellen = sctx->oaep_labellen;
 148                 }
 149         return 1;
 150         }
 151
 152 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
 153         {
 154         if (ctx->tbuf)
 155                 return 1;
 156         ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
 157         if (!ctx->tbuf)
 158                 return 0;
 159         return 1;
 160         }
 161
 162 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
 163         {
 164         RSA_PKEY_CTX *rctx = ctx->data;
 165         if (rctx)
 166                 {
 167                 if (rctx->pub_exp)
 168                         BN_free(rctx->pub_exp);
 169                 if (rctx->tbuf)
 170                         OPENSSL_free(rctx->tbuf);
 171                 if (rctx->oaep_label)
 172                         OPENSSL_free(rctx->oaep_label);
 173                 OPENSSL_free(rctx);
 174                 }
 175         }
 176
 177 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
 178                                         const unsigned char *tbs, size_t tbslen)
 179         {
 180         int ret;
 181         RSA_PKEY_CTX *rctx = ctx->data;
 182         RSA *rsa = ctx->pkey->pkey.rsa;
 183
 184         if (rctx->md)
 185                 {
 186                 if (tbslen != (size_t)EVP_MD_size(rctx->md))
 187                         {
 188                         RSAerr(RSA_F_PKEY_RSA_SIGN,
 189                                         RSA_R_INVALID_DIGEST_LENGTH);
 190                         return -1;
 191                         }
 192
 193                 if (EVP_MD_type(rctx->md) == NID_mdc2)
 194                         {
 195                         unsigned int sltmp;
 196                         if (rctx->pad_mode != RSA_PKCS1_PADDING)
 197                                 return -1;
 198                         ret = RSA_sign_ASN1_OCTET_STRING(NID_mdc2,
 199                                                 tbs, tbslen, sig, &sltmp, rsa);
 200
 201                         if (ret <= 0)
 202                                 return ret;
 203                         ret = sltmp;
 204                         }
 205                 else if (rctx->pad_mode == RSA_X931_PADDING)
 206                         {
 207                         if (!setup_tbuf(rctx, ctx))
 208                                 return -1;
 209                         memcpy(rctx->tbuf, tbs, tbslen);
 210                         rctx->tbuf[tbslen] =
 211                                 RSA_X931_hash_id(EVP_MD_type(rctx->md));
 212                         ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
 213                                                 sig, rsa, RSA_X931_PADDING);
 214                         }
 215                 else if (rctx->pad_mode == RSA_PKCS1_PADDING)
 216                         {
 217                         unsigned int sltmp;
 218                         ret = RSA_sign(EVP_MD_type(rctx->md),
 219                                                 tbs, tbslen, sig, &sltmp, rsa);
 220                         if (ret <= 0)
 221                                 return ret;
 222                         ret = sltmp;
 223                         }
 224                 else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
 225                         {
 226                         if (!setup_tbuf(rctx, ctx))
 227                                 return -1;
 228                         if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
 229                                                 rctx->tbuf, tbs,
 230                                                 rctx->md, rctx->mgf1md,
 231                                                 rctx->saltlen))
 232                                 return -1;
 233                         ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
 234                                                 sig, rsa, RSA_NO_PADDING);
 235                         }
 236                 else
 237                         return -1;
 238                 }
 239         else
 240                 ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
 241                                                         rctx->pad_mode);
 242         if (ret < 0)
 243                 return ret;
 244         *siglen = ret;
 245         return 1;
 246         }
 247
 248
 249 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
 250                                         unsigned char *rout, size_t *routlen,
 251                                         const unsigned char *sig, size_t siglen)
 252         {
 253         int ret;
 254         RSA_PKEY_CTX *rctx = ctx->data;
 255
 256         if (rctx->md)
 257                 {
 258                 if (rctx->pad_mode == RSA_X931_PADDING)
 259                         {
 260                         if (!setup_tbuf(rctx, ctx))
 261                                 return -1;
 262                         ret = RSA_public_decrypt(siglen, sig,
 263                                                 rctx->tbuf, ctx->pkey->pkey.rsa,
 264                                                 RSA_X931_PADDING);
 265                         if (ret < 1)
 266                                 return 0;
 267                         ret--;
 268                         if (rctx->tbuf[ret] !=
 269                                 RSA_X931_hash_id(EVP_MD_type(rctx->md)))
 270                                 {
 271                                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 272                                                 RSA_R_ALGORITHM_MISMATCH);
 273                                 return 0;
 274                                 }
 275                         if (ret != EVP_MD_size(rctx->md))
 276                                 {
 277                                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 278                                         RSA_R_INVALID_DIGEST_LENGTH);
 279                                 return 0;
 280                                 }
 281                         if (rout)
 282                                 memcpy(rout, rctx->tbuf, ret);
 283                         }
 284                 else if (rctx->pad_mode == RSA_PKCS1_PADDING)
 285                         {
 286                         size_t sltmp;
 287                         ret = int_rsa_verify(EVP_MD_type(rctx->md),
 288                                                 NULL, 0, rout, &sltmp,
 289                                         sig, siglen, ctx->pkey->pkey.rsa);
 290                         if (ret <= 0)
 291                                 return 0;
 292                         ret = sltmp;
 293                         }
 294                 else
 295                         return -1;
 296                 }
 297         else
 298                 ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
 299                                                         rctx->pad_mode);
 300         if (ret < 0)
 301                 return ret;
 302         *routlen = ret;
 303         return 1;
 304         }
 305
 306 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
 307                                         const unsigned char *sig, size_t siglen,
 308                                         const unsigned char *tbs, size_t tbslen)
 309         {
 310         RSA_PKEY_CTX *rctx = ctx->data;
 311         RSA *rsa = ctx->pkey->pkey.rsa;
 312         size_t rslen;
 313         if (rctx->md)
 314                 {
 315                 if (rctx->pad_mode == RSA_PKCS1_PADDING)
 316                         return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
 317                                         sig, siglen, rsa);
 318                 if (rctx->pad_mode == RSA_X931_PADDING)
 319                         {
 320                         if (pkey_rsa_verifyrecover(ctx, NULL, &rslen,
 321                                         sig, siglen) <= 0)
 322                                 return 0;
 323                         }
 324                 else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
 325                         {
 326                         int ret;
 327                         if (!setup_tbuf(rctx, ctx))
 328                                 return -1;
 329                         ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 330                                                         rsa, RSA_NO_PADDING);
 331                         if (ret <= 0)
 332                                 return 0;
 333                         ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
 334                                                 rctx->md, rctx->mgf1md,
 335                                                 rctx->tbuf, rctx->saltlen);
 336                         if (ret <= 0)
 337                                 return 0;
 338                         return 1;
 339                         }
 340                 else
 341                         return -1;
 342                 }
 343         else
 344                 {
 345                 if (!setup_tbuf(rctx, ctx))
 346                         return -1;
 347                 rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 348                                                 rsa, rctx->pad_mode);
 349                 if (rslen == 0)
 350                         return 0;
 351                 }
 352
 353         if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
 354                 return 0;
 355
 356         return 1;
 357
 358         }
 359
 360 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
 361                                         unsigned char *out, size_t *outlen,
 362                                         const unsigned char *in, size_t inlen)
 363         {
 364         int ret;
 365         RSA_PKEY_CTX *rctx = ctx->data;
 366         if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING)
 367                 {
 368                 int klen = RSA_size(ctx->pkey->pkey.rsa);
 369                 if (!setup_tbuf(rctx, ctx))
 370                         return -1;
 371                 if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
 372                                                         in, inlen,
 373                                                         rctx->oaep_label,
 374                                                         rctx->oaep_labellen,
 375                                                         rctx->md, rctx->mgf1md))
 376                         return -1;
 377                 ret = RSA_public_encrypt(klen, rctx->tbuf, out,
 378                                                 ctx->pkey->pkey.rsa,
 379                                                 RSA_NO_PADDING);
 380                 }
 381         else
 382                 ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 383                                                         rctx->pad_mode);
 384         if (ret < 0)
 385                 return ret;
 386         *outlen = ret;
 387         return 1;
 388         }
 389
 390 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
 391                                         unsigned char *out, size_t *outlen,
 392                                         const unsigned char *in, size_t inlen)
 393         {
 394         int ret;
 395         RSA_PKEY_CTX *rctx = ctx->data;
 396         if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING)
 397                 {
 398                 int i;
 399                 if (!setup_tbuf(rctx, ctx))
 400                         return -1;
 401                 ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
 402                                                         ctx->pkey->pkey.rsa,
 403                                                         RSA_NO_PADDING);
 404                 if (ret <= 0)
 405                         return ret;
 406                 for (i = 0; i < ret; i++)
 407                         {
 408                         if (rctx->tbuf[i])
 409                                 break;
 410                         }
 411                 ret = RSA_padding_check_PKCS1_OAEP_mgf1(out,ret,rctx->tbuf + i,
 412                                                         ret - i, ret,
 413                                                         rctx->oaep_label,
 414                                                         rctx->oaep_labellen,
 415                                                         rctx->md, rctx->mgf1md);
 416                 }
 417         else
 418                 ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 419                                                         rctx->pad_mode);
 420         if (ret < 0)
 421                 return ret;
 422         *outlen = ret;
 423         return 1;
 424         }
 425
 426 static int check_padding_md(const EVP_MD *md, int padding)
 427         {
 428         if (!md)
 429                 return 1;
 430
 431         if (padding == RSA_NO_PADDING)
 432                 {
 433                 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
 434                 return 0;
 435                 }
 436
 437         if (padding == RSA_X931_PADDING)
 438                 {
 439                 if (RSA_X931_hash_id(EVP_MD_type(md)) == -1)
 440                         {
 441                         RSAerr(RSA_F_CHECK_PADDING_MD,
 442                                                 RSA_R_INVALID_X931_DIGEST);
 443                         return 0;
 444                         }
 445                 return 1;
 446                 }
 447
 448         return 1;
 449         }
 450
 451
 452 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 453         {
 454         RSA_PKEY_CTX *rctx = ctx->data;
 455         switch (type)
 456                 {
 457                 case EVP_PKEY_CTRL_RSA_PADDING:
 458                 if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING))
 459                         {
 460                         if (!check_padding_md(rctx->md, p1))
 461                                 return 0;
 462                         if (p1 == RSA_PKCS1_PSS_PADDING)
 463                                 {
 464                                 if (!(ctx->operation &
 465                                      (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
 466                                         goto bad_pad;
 467                                 if (!rctx->md)
 468                                         rctx->md = EVP_sha1();
 469                                 }
 470                         if (p1 == RSA_PKCS1_OAEP_PADDING)
 471                                 {
 472                                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
 473                                         goto bad_pad;
 474                                 if (!rctx->md)
 475                                         rctx->md = EVP_sha1();
 476                                 }
 477                         rctx->pad_mode = p1;
 478                         return 1;
 479                         }
 480                 bad_pad:
 481                 RSAerr(RSA_F_PKEY_RSA_CTRL,
 482                                 RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 483                 return -2;
 484
 485                 case EVP_PKEY_CTRL_GET_RSA_PADDING:
 486                 *(int *)p2 = rctx->pad_mode;
 487                 return 1;
 488
 489                 case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
 490                 case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
 491                 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING)
 492                         {
 493                         RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 494                         return -2;
 495                         }
 496                 if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN)
 497                         *(int *)p2 = rctx->saltlen;
 498                 else
 499                         {
 500                         if (p1 < -2)
 501                                 return -2;
 502                         rctx->saltlen = p1;
 503                         }
 504                 return 1;
 505
 506                 case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
 507                 if (p1 < 256)
 508                         {
 509                         RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_KEYBITS);
 510                         return -2;
 511                         }
 512                 rctx->nbits = p1;
 513                 return 1;
 514
 515                 case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
 516                 if (!p2)
 517                         return -2;
 518                 BN_free(rctx->pub_exp);
 519                 rctx->pub_exp = p2;
 520                 return 1;
 521
 522                 case EVP_PKEY_CTRL_RSA_OAEP_MD:
 523                 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING)
 524                         {
 525                         RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 526                         return 0;
 527                         }
 528                 rctx->md = p2;
 529                 return 1;
 530
 531                 case EVP_PKEY_CTRL_MD:
 532                 if (!check_padding_md(p2, rctx->pad_mode))
 533                         return 0;
 534                 rctx->md = p2;
 535                 return 1;
 536
 537                 case EVP_PKEY_CTRL_RSA_MGF1_MD:
 538                 case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
 539                 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
 540                         && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING)
 541                         {
 542                         RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
 543                         return -2;
 544                         }
 545                 if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD)
 546                         {
 547                         if (rctx->mgf1md)
 548                                 *(const EVP_MD **)p2 = rctx->mgf1md;
 549                         else
 550                                 *(const EVP_MD **)p2 = rctx->md;
 551                         }
 552                 else
 553                         rctx->mgf1md = p2;
 554                 return 1;
 555
 556                 case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
 557                 OPENSSL_free(rctx->oaep_label);
 558                 rctx->oaep_label = p2;
 559                 rctx->oaep_labellen = p1;
 560                 return 1;
 561
 562                 case EVP_PKEY_CTRL_DIGESTINIT:
 563                 case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 564                 case EVP_PKEY_CTRL_PKCS7_DECRYPT:
 565                 case EVP_PKEY_CTRL_PKCS7_SIGN:
 566                 return 1;
 567 #ifndef OPENSSL_NO_CMS
 568                 case EVP_PKEY_CTRL_CMS_DECRYPT:
 569                 {
 570                 X509_ALGOR *alg = NULL;
 571                 ASN1_OBJECT *encalg = NULL;
 572                 if (p2)
 573                         CMS_RecipientInfo_ktri_get0_algs(p2, NULL, NULL, &alg);
 574                 if (alg)
 575                         X509_ALGOR_get0(&encalg, NULL, NULL, alg);
 576                 if (encalg && OBJ_obj2nid(encalg) == NID_rsaesOaep)
 577                         rctx->pad_mode = RSA_PKCS1_OAEP_PADDING;
 578                 }
 579                 case EVP_PKEY_CTRL_CMS_ENCRYPT:
 580                 case EVP_PKEY_CTRL_CMS_SIGN:
 581                 return 1;
 582 #endif
 583                 case EVP_PKEY_CTRL_PEER_KEY:
 584                         RSAerr(RSA_F_PKEY_RSA_CTRL,
 585                         RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 586                         return -2;
 587
 588                 default:
 589                 return -2;
 590
 591                 }
 592         }
 593
 594 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 595                         const char *type, const char *value)
 596         {
 597         if (!value)
 598                 {
 599                 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
 600                 return 0;
 601                 }
 602         if (!strcmp(type, "rsa_padding_mode"))
 603                 {
 604                 int pm;
 605                 if (!strcmp(value, "pkcs1"))
 606                         pm = RSA_PKCS1_PADDING;
 607                 else if (!strcmp(value, "sslv23"))
 608                         pm = RSA_SSLV23_PADDING;
 609                 else if (!strcmp(value, "none"))
 610                         pm = RSA_NO_PADDING;
 611                 else if (!strcmp(value, "oeap"))
 612                         pm = RSA_PKCS1_OAEP_PADDING;
 613                 else if (!strcmp(value, "oaep"))
 614                         pm = RSA_PKCS1_OAEP_PADDING;
 615                 else if (!strcmp(value, "x931"))
 616                         pm = RSA_X931_PADDING;
 617                 else if (!strcmp(value, "pss"))
 618                         pm = RSA_PKCS1_PSS_PADDING;
 619                 else
 620                         {
 621                         RSAerr(RSA_F_PKEY_RSA_CTRL_STR,
 622                                                 RSA_R_UNKNOWN_PADDING_TYPE);
 623                         return -2;
 624                         }
 625                 return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 626                 }
 627
 628         if (!strcmp(type, "rsa_pss_saltlen"))
 629                 {
 630                 int saltlen;
 631                 saltlen = atoi(value);
 632                 return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 633                 }
 634
 635         if (!strcmp(type, "rsa_keygen_bits"))
 636                 {
 637                 int nbits;
 638                 nbits = atoi(value);
 639                 return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
 640                 }
 641
 642         if (!strcmp(type, "rsa_keygen_pubexp"))
 643                 {
 644                 int ret;
 645                 BIGNUM *pubexp = NULL;
 646                 if (!BN_asc2bn(&pubexp, value))
 647                         return 0;
 648                 ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
 649                 if (ret <= 0)
 650                         BN_free(pubexp);
 651                 return ret;
 652                 }
 653
 654         if (!strcmp(type, "rsa_mgf1_md"))
 655                 {
 656                 const EVP_MD *md;
 657                 if (!(md = EVP_get_digestbyname(value)))
 658                         {
 659                         RSAerr(RSA_F_PKEY_RSA_CTRL_STR,
 660                                                 RSA_R_INVALID_DIGEST);
 661                         return 0;
 662                         }
 663                 return EVP_PKEY_CTX_set_rsa_mgf1_md(ctx, md);
 664                 }
 665
 666         if (!strcmp(type, "rsa_oaep_md"))
 667                 {
 668                 const EVP_MD *md;
 669                 if (!(md = EVP_get_digestbyname(value)))
 670                         {
 671                         RSAerr(RSA_F_PKEY_RSA_CTRL_STR,
 672                                                 RSA_R_INVALID_DIGEST);
 673                         return 0;
 674                         }
 675                 return EVP_PKEY_CTX_set_rsa_oaep_md(ctx, md);
 676                 }
 677         if (!strcmp(type, "rsa_oaep_label"))
 678                 {
 679                 unsigned char *lab;
 680                 long lablen;
 681                 int ret;
 682                 lab = string_to_hex(value, &lablen);
 683                 if (!lab)
 684                         return 0;
 685                 ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
 686                 if (ret <= 0)
 687                         OPENSSL_free(lab);
 688                 return ret;
 689                 }
 690
 691         return -2;
 692         }
 693
 694 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 695         {
 696         RSA *rsa = NULL;
 697         RSA_PKEY_CTX *rctx = ctx->data;
 698         BN_GENCB *pcb, cb;
 699         int ret;
 700         if (!rctx->pub_exp)
 701                 {
 702                 rctx->pub_exp = BN_new();
 703                 if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
 704                         return 0;
 705                 }
 706         rsa = RSA_new();
 707         if (!rsa)
 708                 return 0;
 709         if (ctx->pkey_gencb)
 710                 {
 711                 pcb = &cb;
 712                 evp_pkey_set_cb_translate(pcb, ctx);
 713                 }
 714         else
 715                 pcb = NULL;
 716         ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
 717         if (ret > 0)
 718                 EVP_PKEY_assign_RSA(pkey, rsa);
 719         else
 720                 RSA_free(rsa);
 721         return ret;
 722         }
 723
 724 const EVP_PKEY_METHOD rsa_pkey_meth =
 725         {
 726         EVP_PKEY_RSA,
 727         EVP_PKEY_FLAG_AUTOARGLEN,
 728         pkey_rsa_init,
 729         pkey_rsa_copy,
 730         pkey_rsa_cleanup,
 731
 732         0,0,
 733
 734         0,
 735         pkey_rsa_keygen,
 736
 737         0,
 738         pkey_rsa_sign,
 739
 740         0,
 741         pkey_rsa_verify,
 742
 743         0,
 744         pkey_rsa_verifyrecover,
 745
 746
 747         0,0,0,0,
 748
 749         0,
 750         pkey_rsa_encrypt,
 751
 752         0,
 753         pkey_rsa_decrypt,
 754
 755         0,0,
 756
 757         pkey_rsa_ctrl,
 758         pkey_rsa_ctrl_str
 759
 760
 761         };