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