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                         const EVP_MD *pssmd;
 191                         pssmd = rctx->mgf1md;
 192                         if (pssmd == NULL)
 193                                 pssmd = rctx->md;
 194                         if (!setup_tbuf(rctx, ctx))
 195                                 return -1;
 196                         if (!RSA_padding_add_PKCS1_PSS(rsa, rctx->tbuf, tbs,
 197                                                 pssmd, rctx->saltlen))
 198                                 return -1;
 199                         ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
 200                                                 sig, rsa, RSA_NO_PADDING);
 201                         }
 202                 else
 203                         return -1;
 204                 }
 205         else
 206                 ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
 207                                                         rctx->pad_mode);
 208         if (ret < 0)
 209                 return ret;
 210         *siglen = ret;
 211         return 1;
 212         }
 213
 214
 215 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
 216                                         unsigned char *rout, size_t *routlen,
 217                                         const unsigned char *sig, size_t siglen)
 218         {
 219         int ret;
 220         RSA_PKEY_CTX *rctx = ctx->data;
 221
 222         if (rctx->md)
 223                 {
 224                 if (rctx->pad_mode == RSA_X931_PADDING)
 225                         {
 226                         if (!setup_tbuf(rctx, ctx))
 227                                 return -1;
 228                         ret = RSA_public_decrypt(siglen, sig,
 229                                                 rctx->tbuf, ctx->pkey->pkey.rsa,
 230                                                 RSA_X931_PADDING);
 231                         if (ret < 1)
 232                                 return 0;
 233                         ret--;
 234                         if (rctx->tbuf[ret] !=
 235                                 RSA_X931_hash_id(EVP_MD_type(rctx->md)))
 236                                 {
 237                                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 238                                                 RSA_R_ALGORITHM_MISMATCH);
 239                                 return 0;
 240                                 }
 241                         if (ret != EVP_MD_size(rctx->md))
 242                                 {
 243                                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 244                                         RSA_R_INVALID_DIGEST_LENGTH);
 245                                 return 0;
 246                                 }
 247                         if (rout)
 248                                 memcpy(rout, rctx->tbuf, ret);
 249                         }
 250                 else if (rctx->pad_mode == RSA_PKCS1_PADDING)
 251                         {
 252                         size_t sltmp;
 253                         ret = int_rsa_verify(EVP_MD_type(rctx->md),
 254                                                 NULL, 0, rout, &sltmp,
 255                                         sig, siglen, ctx->pkey->pkey.rsa);
 256                         ret = sltmp;
 257                         }
 258                 else
 259                         return -1;
 260                 }
 261         else
 262                 ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
 263                                                         rctx->pad_mode);
 264         if (ret < 0)
 265                 return ret;
 266         *routlen = ret;
 267         return 1;
 268         }
 269
 270 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
 271                                         const unsigned char *sig, size_t siglen,
 272                                         const unsigned char *tbs, size_t tbslen)
 273         {
 274         RSA_PKEY_CTX *rctx = ctx->data;
 275         RSA *rsa = ctx->pkey->pkey.rsa;
 276         size_t rslen;
 277         if (rctx->md)
 278                 {
 279                 if (rctx->pad_mode == RSA_PKCS1_PADDING)
 280                         return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
 281                                         sig, siglen, rsa);
 282                 if (rctx->pad_mode == RSA_X931_PADDING)
 283                         {
 284                         if (pkey_rsa_verifyrecover(ctx, NULL, &rslen,
 285                                         sig, siglen) <= 0)
 286                                 return 0;
 287                         }
 288                 else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
 289                         {
 290                         int ret;
 291                         const EVP_MD *pssmd;
 292                         pssmd = rctx->mgf1md;
 293                         if (pssmd == NULL)
 294                                 pssmd = rctx->md;
 295                         if (!setup_tbuf(rctx, ctx))
 296                                 return -1;
 297                         ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 298                                                         rsa, RSA_NO_PADDING);
 299                         if (ret <= 0)
 300                                 return 0;
 301                         ret = RSA_verify_PKCS1_PSS(rsa, tbs, pssmd,
 302                                                 rctx->tbuf, rctx->saltlen);
 303                         if (ret <= 0)
 304                                 return 0;
 305                         return 1;
 306                         }
 307                 else
 308                         return -1;
 309                 }
 310         else
 311                 {
 312                 if (!setup_tbuf(rctx, ctx))
 313                         return -1;
 314                 rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 315                                                 rsa, rctx->pad_mode);
 316                 if (rslen == 0)
 317                         return 0;
 318                 }
 319
 320         if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
 321                 return 0;
 322
 323         return 1;
 324
 325         }
 326
 327
 328 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
 329                                         unsigned char *out, size_t *outlen,
 330                                         const unsigned char *in, size_t inlen)
 331         {
 332         int ret;
 333         RSA_PKEY_CTX *rctx = ctx->data;
 334         ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 335                                                         rctx->pad_mode);
 336         if (ret < 0)
 337                 return ret;
 338         *outlen = ret;
 339         return 1;
 340         }
 341
 342 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
 343                                         unsigned char *out, size_t *outlen,
 344                                         const unsigned char *in, size_t inlen)
 345         {
 346         int ret;
 347         RSA_PKEY_CTX *rctx = ctx->data;
 348         ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 349                                                         rctx->pad_mode);
 350         if (ret < 0)
 351                 return ret;
 352         *outlen = ret;
 353         return 1;
 354         }
 355
 356 static int check_padding_md(const EVP_MD *md, int padding)
 357         {
 358         if (!md)
 359                 return 1;
 360
 361         if (padding == RSA_NO_PADDING)
 362                 {
 363                 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
 364                 return 0;
 365                 }
 366
 367         if (padding == RSA_X931_PADDING)
 368                 {
 369                 if (RSA_X931_hash_id(EVP_MD_type(md)) == -1)
 370                         {
 371                         RSAerr(RSA_F_CHECK_PADDING_MD,
 372                                                 RSA_R_INVALID_X931_DIGEST);
 373                         return 0;
 374                         }
 375                 return 1;
 376                 }
 377
 378         return 1;
 379         }
 380
 381
 382 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 383         {
 384         RSA_PKEY_CTX *rctx = ctx->data;
 385         switch (type)
 386                 {
 387                 case EVP_PKEY_CTRL_RSA_PADDING:
 388                 if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING))
 389                         {
 390                         if (!check_padding_md(rctx->md, p1))
 391                                 return 0;
 392                         if (p1 == RSA_PKCS1_PSS_PADDING)
 393                                 {
 394                                 if (!(ctx->operation &
 395                                      (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
 396                                         goto bad_pad;
 397                                 if (!rctx->md)
 398                                         rctx->md = EVP_sha1();
 399                                 }
 400                         if (p1 == RSA_PKCS1_OAEP_PADDING)
 401                                 {
 402                                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
 403                                         goto bad_pad;
 404                                 if (!rctx->md)
 405                                         rctx->md = EVP_sha1();
 406                                 }
 407                         rctx->pad_mode = p1;
 408                         return 1;
 409                         }
 410                 bad_pad:
 411                 RSAerr(RSA_F_PKEY_RSA_CTRL,
 412                                 RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 413                 return -2;
 414
 415                 case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
 416                 if (p1 < -2)
 417                         return -2;
 418                 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING)
 419                         {
 420                         RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 421                         return -2;
 422                         }
 423                 rctx->saltlen = p1;
 424                 return 1;
 425
 426                 case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
 427                 if (p1 < 256)
 428                         {
 429                         RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_KEYBITS);
 430                         return -2;
 431                         }
 432                 rctx->nbits = p1;
 433                 return 1;
 434
 435                 case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
 436                 if (!p2)
 437                         return -2;
 438                 rctx->pub_exp = p2;
 439                 return 1;
 440
 441                 case EVP_PKEY_CTRL_MD:
 442                 if (!check_padding_md(p2, rctx->pad_mode))
 443                         return 0;
 444                 rctx->md = p2;
 445                 return 1;
 446
 447                 case EVP_PKEY_CTRL_MGF1_MD:
 448                 rctx->mgf1md = p2;
 449                 return 1;
 450
 451                 case EVP_PKEY_CTRL_DIGESTINIT:
 452                 case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 453                 case EVP_PKEY_CTRL_PKCS7_DECRYPT:
 454                 case EVP_PKEY_CTRL_PKCS7_SIGN:
 455 #ifndef OPENSSL_NO_CMS
 456                 case EVP_PKEY_CTRL_CMS_ENCRYPT:
 457                 case EVP_PKEY_CTRL_CMS_DECRYPT:
 458                 case EVP_PKEY_CTRL_CMS_SIGN:
 459 #endif
 460                 return 1;
 461                 case EVP_PKEY_CTRL_PEER_KEY:
 462                         RSAerr(RSA_F_PKEY_RSA_CTRL,
 463                         RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 464                         return -2;
 465
 466                 default:
 467                 return -2;
 468
 469                 }
 470         }
 471
 472 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 473                         const char *type, const char *value)
 474         {
 475         if (!value)
 476                 {
 477                 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
 478                 return 0;
 479                 }
 480         if (!strcmp(type, "rsa_padding_mode"))
 481                 {
 482                 int pm;
 483                 if (!strcmp(value, "pkcs1"))
 484                         pm = RSA_PKCS1_PADDING;
 485                 else if (!strcmp(value, "sslv23"))
 486                         pm = RSA_SSLV23_PADDING;
 487                 else if (!strcmp(value, "none"))
 488                         pm = RSA_NO_PADDING;
 489                 else if (!strcmp(value, "oeap"))
 490                         pm = RSA_PKCS1_OAEP_PADDING;
 491                 else if (!strcmp(value, "x931"))
 492                         pm = RSA_X931_PADDING;
 493                 else if (!strcmp(value, "pss"))
 494                         pm = RSA_PKCS1_PSS_PADDING;
 495                 else
 496                         {
 497                         RSAerr(RSA_F_PKEY_RSA_CTRL_STR,
 498                                                 RSA_R_UNKNOWN_PADDING_TYPE);
 499                         return -2;
 500                         }
 501                 return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 502                 }
 503
 504         if (!strcmp(type, "rsa_pss_saltlen"))
 505                 {
 506                 int saltlen;
 507                 saltlen = atoi(value);
 508                 return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 509                 }
 510
 511         if (!strcmp(type, "rsa_keygen_bits"))
 512                 {
 513                 int nbits;
 514                 nbits = atoi(value);
 515                 return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
 516                 }
 517
 518         if (!strcmp(type, "rsa_keygen_pubexp"))
 519                 {
 520                 int ret;
 521                 BIGNUM *pubexp = NULL;
 522                 if (!BN_asc2bn(&pubexp, value))
 523                         return 0;
 524                 ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
 525                 if (ret <= 0)
 526                         BN_free(pubexp);
 527                 return ret;
 528                 }
 529
 530         return -2;
 531         }
 532
 533 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 534         {
 535         RSA *rsa = NULL;
 536         RSA_PKEY_CTX *rctx = ctx->data;
 537         BN_GENCB *pcb, cb;
 538         int ret;
 539         if (!rctx->pub_exp)
 540                 {
 541                 rctx->pub_exp = BN_new();
 542                 if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
 543                         return 0;
 544                 }
 545         rsa = RSA_new();
 546         if (!rsa)
 547                 return 0;
 548         if (ctx->pkey_gencb)
 549                 {
 550                 pcb = &cb;
 551                 evp_pkey_set_cb_translate(pcb, ctx);
 552                 }
 553         else
 554                 pcb = NULL;
 555         ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
 556         if (ret > 0)
 557                 EVP_PKEY_assign_RSA(pkey, rsa);
 558         else
 559                 RSA_free(rsa);
 560         return ret;
 561         }
 562
 563 const EVP_PKEY_METHOD rsa_pkey_meth =
 564         {
 565         EVP_PKEY_RSA,
 566         EVP_PKEY_FLAG_AUTOARGLEN,
 567         pkey_rsa_init,
 568         pkey_rsa_copy,
 569         pkey_rsa_cleanup,
 570
 571         0,0,
 572
 573         0,
 574         pkey_rsa_keygen,
 575
 576         0,
 577         pkey_rsa_sign,
 578
 579         0,
 580         pkey_rsa_verify,
 581
 582         0,
 583         pkey_rsa_verifyrecover,
 584
 585
 586         0,0,0,0,
 587
 588         0,
 589         pkey_rsa_encrypt,
 590
 591         0,
 592         pkey_rsa_decrypt,
 593
 594         0,0,
 595
 596         pkey_rsa_ctrl,
 597         pkey_rsa_ctrl_str
 598
 599
 600         };