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