crypto/rsa/rsa_pmeth.c

   1 /* crypto/rsa/rsa_pmeth.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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         /* PSS/OAEP salt length */
  83         int saltlen;
  84         /* Temp buffer */
  85         unsigned char *tbuf;
  86         } RSA_PKEY_CTX;
  87
  88 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
  89         {
  90         RSA_PKEY_CTX *rctx;
  91         rctx = OPENSSL_malloc(sizeof(RSA_PKEY_CTX));
  92         if (!rctx)
  93                 return 0;
  94         rctx->nbits = 1024;
  95         rctx->pub_exp = NULL;
  96         rctx->pad_mode = RSA_PKCS1_PADDING;
  97         rctx->md = NULL;
  98         rctx->tbuf = NULL;
  99
 100         rctx->saltlen = -2;
 101
 102         ctx->data = rctx;
 103         ctx->keygen_info = rctx->gentmp;
 104         ctx->keygen_info_count = 2;
 105
 106         return 1;
 107         }
 108
 109 static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
 110         {
 111         RSA_PKEY_CTX *dctx, *sctx;
 112         if (!pkey_rsa_init(dst))
 113                 return 0;
 114         sctx = src->data;
 115         dctx = dst->data;
 116         dctx->nbits = sctx->nbits;
 117         if (sctx->pub_exp)
 118                 {
 119                 dctx->pub_exp = BN_dup(sctx->pub_exp);
 120                 if (!dctx->pub_exp)
 121                         return 0;
 122                 }
 123         dctx->pad_mode = sctx->pad_mode;
 124         dctx->md = sctx->md;
 125         return 1;
 126         }
 127
 128 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
 129         {
 130         if (ctx->tbuf)
 131                 return 1;
 132         ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
 133         if (!ctx->tbuf)
 134                 return 0;
 135         return 1;
 136         }
 137
 138 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
 139         {
 140         RSA_PKEY_CTX *rctx = ctx->data;
 141         if (rctx)
 142                 {
 143                 if (rctx->pub_exp)
 144                         BN_free(rctx->pub_exp);
 145                 if (rctx->tbuf)
 146                         OPENSSL_free(rctx->tbuf);
 147                 OPENSSL_free(rctx);
 148                 }
 149         }
 150
 151 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
 152                                         const unsigned char *tbs, size_t tbslen)
 153         {
 154         int ret;
 155         RSA_PKEY_CTX *rctx = ctx->data;
 156         RSA *rsa = ctx->pkey->pkey.rsa;
 157
 158         if (rctx->md)
 159                 {
 160                 if (tbslen != (size_t)EVP_MD_size(rctx->md))
 161                         {
 162                         RSAerr(RSA_F_PKEY_RSA_SIGN,
 163                                         RSA_R_INVALID_DIGEST_LENGTH);
 164                         return -1;
 165                         }
 166                 if (rctx->pad_mode == RSA_X931_PADDING)
 167                         {
 168                         if (!setup_tbuf(rctx, ctx))
 169                                 return -1;
 170                         memcpy(rctx->tbuf, tbs, tbslen);
 171                         rctx->tbuf[tbslen] =
 172                                 RSA_X931_hash_id(EVP_MD_type(rctx->md));
 173                         ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
 174                                                 sig, rsa, RSA_X931_PADDING);
 175                         }
 176                 else if (rctx->pad_mode == RSA_PKCS1_PADDING)
 177                         {
 178                         unsigned int sltmp;
 179                         ret = RSA_sign(EVP_MD_type(rctx->md),
 180                                                 tbs, tbslen, sig, &sltmp, rsa);
 181                         if (ret <= 0)
 182                                 return ret;
 183                         ret = sltmp;
 184                         }
 185                 else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
 186                         {
 187                         if (!setup_tbuf(rctx, ctx))
 188                                 return -1;
 189                         if (!RSA_padding_add_PKCS1_PSS(rsa, rctx->tbuf, tbs,
 190                                                 rctx->md, rctx->saltlen))
 191                                 return -1;
 192                         ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
 193                                                 sig, rsa, RSA_NO_PADDING);
 194                         }
 195                 else
 196                         return -1;
 197                 }
 198         else
 199                 ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
 200                                                         rctx->pad_mode);
 201         if (ret < 0)
 202                 return ret;
 203         *siglen = ret;
 204         return 1;
 205         }
 206
 207
 208 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
 209                                         unsigned char *rout, size_t *routlen,
 210                                         const unsigned char *sig, size_t siglen)
 211         {
 212         int ret;
 213         RSA_PKEY_CTX *rctx = ctx->data;
 214
 215         if (rctx->md)
 216                 {
 217                 if (rctx->pad_mode == RSA_X931_PADDING)
 218                         {
 219                         if (!setup_tbuf(rctx, ctx))
 220                                 return -1;
 221                         ret = RSA_public_decrypt(siglen, sig,
 222                                                 rctx->tbuf, ctx->pkey->pkey.rsa,
 223                                                 RSA_X931_PADDING);
 224                         if (ret < 1)
 225                                 return 0;
 226                         ret--;
 227                         if (rctx->tbuf[ret] !=
 228                                 RSA_X931_hash_id(EVP_MD_type(rctx->md)))
 229                                 {
 230                                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 231                                                 RSA_R_ALGORITHM_MISMATCH);
 232                                 return 0;
 233                                 }
 234                         if (ret != EVP_MD_size(rctx->md))
 235                                 {
 236                                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 237                                         RSA_R_INVALID_DIGEST_LENGTH);
 238                                 return 0;
 239                                 }
 240                         if (rout)
 241                                 memcpy(rout, rctx->tbuf, ret);
 242                         }
 243                 else if (rctx->pad_mode == RSA_PKCS1_PADDING)
 244                         {
 245                         size_t sltmp;
 246                         ret = int_rsa_verify(EVP_MD_type(rctx->md),
 247                                                 NULL, 0, rout, &sltmp,
 248                                         sig, siglen, ctx->pkey->pkey.rsa);
 249                         ret = sltmp;
 250                         }
 251                 else
 252                         return -1;
 253                 }
 254         else
 255                 ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
 256                                                         rctx->pad_mode);
 257         if (ret < 0)
 258                 return ret;
 259         *routlen = ret;
 260         return 1;
 261         }
 262
 263 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
 264                                         const unsigned char *sig, size_t siglen,
 265                                         const unsigned char *tbs, size_t tbslen)
 266         {
 267         RSA_PKEY_CTX *rctx = ctx->data;
 268         RSA *rsa = ctx->pkey->pkey.rsa;
 269         size_t rslen;
 270         if (rctx->md)
 271                 {
 272                 if (rctx->pad_mode == RSA_PKCS1_PADDING)
 273                         return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
 274                                         sig, siglen, rsa);
 275                 if (rctx->pad_mode == RSA_X931_PADDING)
 276                         {
 277                         if (pkey_rsa_verifyrecover(ctx, NULL, &rslen,
 278                                         sig, siglen) <= 0)
 279                                 return 0;
 280                         }
 281                 else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
 282                         {
 283                         int ret;
 284                         if (!setup_tbuf(rctx, ctx))
 285                                 return -1;
 286                         ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 287                                                         rsa, RSA_NO_PADDING);
 288                         if (ret <= 0)
 289                                 return 0;
 290                         ret = RSA_verify_PKCS1_PSS(rsa, tbs, rctx->md,
 291                                                 rctx->tbuf, rctx->saltlen);
 292                         if (ret <= 0)
 293                                 return 0;
 294                         return 1;
 295                         }
 296                 else
 297                         return -1;
 298                 }
 299         else
 300                 {
 301                 if (!setup_tbuf(rctx, ctx))
 302                         return -1;
 303                 rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 304                                                 rsa, rctx->pad_mode);
 305                 if (rslen == 0)
 306                         return 0;
 307                 }
 308
 309         if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
 310                 return 0;
 311
 312         return 1;
 313
 314         }
 315
 316
 317 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
 318                                         unsigned char *out, size_t *outlen,
 319                                         const unsigned char *in, size_t inlen)
 320         {
 321         int ret;
 322         RSA_PKEY_CTX *rctx = ctx->data;
 323         ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 324                                                         rctx->pad_mode);
 325         if (ret < 0)
 326                 return ret;
 327         *outlen = ret;
 328         return 1;
 329         }
 330
 331 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
 332                                         unsigned char *out, size_t *outlen,
 333                                         const unsigned char *in, size_t inlen)
 334         {
 335         int ret;
 336         RSA_PKEY_CTX *rctx = ctx->data;
 337         ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 338                                                         rctx->pad_mode);
 339         if (ret < 0)
 340                 return ret;
 341         *outlen = ret;
 342         return 1;
 343         }
 344
 345 static int check_padding_md(const EVP_MD *md, int padding)
 346         {
 347         if (!md)
 348                 return 1;
 349
 350         if (padding == RSA_NO_PADDING)
 351                 {
 352                 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
 353                 return 0;
 354                 }
 355
 356         if (padding == RSA_X931_PADDING)
 357                 {
 358                 if (RSA_X931_hash_id(EVP_MD_type(md)) == -1)
 359                         {
 360                         RSAerr(RSA_F_CHECK_PADDING_MD,
 361                                                 RSA_R_INVALID_X931_DIGEST);
 362                         return 0;
 363                         }
 364                 return 1;
 365                 }
 366
 367         return 1;
 368         }
 369
 370
 371 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 372         {
 373         RSA_PKEY_CTX *rctx = ctx->data;
 374         switch (type)
 375                 {
 376                 case EVP_PKEY_CTRL_RSA_PADDING:
 377                 if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING))
 378                         {
 379                         if (!check_padding_md(rctx->md, p1))
 380                                 return 0;
 381                         if (p1 == RSA_PKCS1_PSS_PADDING)
 382                                 {
 383                                 if (!(ctx->operation &
 384                                      (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
 385                                         goto bad_pad;
 386                                 if (!rctx->md)
 387                                         rctx->md = EVP_sha1();
 388                                 }
 389                         if (p1 == RSA_PKCS1_OAEP_PADDING)
 390                                 {
 391                                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
 392                                         goto bad_pad;
 393                                 if (!rctx->md)
 394                                         rctx->md = EVP_sha1();
 395                                 }
 396                         rctx->pad_mode = p1;
 397                         return 1;
 398                         }
 399                 bad_pad:
 400                 RSAerr(RSA_F_PKEY_RSA_CTRL,
 401                                 RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 402                 return -2;
 403
 404                 case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
 405                 if (p1 < -2)
 406                         return -2;
 407                 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING)
 408                         {
 409                         RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 410                         return -2;
 411                         }
 412                 rctx->saltlen = p1;
 413                 return 1;
 414
 415                 case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
 416                 if (p1 < 256)
 417                         {
 418                         RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_KEYBITS);
 419                         return -2;
 420                         }
 421                 rctx->nbits = p1;
 422                 return 1;
 423
 424                 case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
 425                 if (!p2)
 426                         return -2;
 427                 rctx->pub_exp = p2;
 428                 return 1;
 429
 430                 case EVP_PKEY_CTRL_MD:
 431                 if (!check_padding_md(p2, rctx->pad_mode))
 432                         return 0;
 433                 rctx->md = p2;
 434                 return 1;
 435
 436                 case EVP_PKEY_CTRL_DIGESTINIT:
 437                 case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 438                 case EVP_PKEY_CTRL_PKCS7_DECRYPT:
 439                 case EVP_PKEY_CTRL_PKCS7_SIGN:
 440 #ifndef OPENSSL_NO_CMS
 441                 case EVP_PKEY_CTRL_CMS_ENCRYPT:
 442                 case EVP_PKEY_CTRL_CMS_DECRYPT:
 443                 case EVP_PKEY_CTRL_CMS_SIGN:
 444 #endif
 445                 return 1;
 446                 case EVP_PKEY_CTRL_PEER_KEY:
 447                         RSAerr(RSA_F_PKEY_RSA_CTRL,
 448                         RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 449                         return -2;
 450
 451                 default:
 452                 return -2;
 453
 454                 }
 455         }
 456
 457 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 458                         const char *type, const char *value)
 459         {
 460         if (!value)
 461                 {
 462                 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
 463                 return 0;
 464                 }
 465         if (!strcmp(type, "rsa_padding_mode"))
 466                 {
 467                 int pm;
 468                 if (!strcmp(value, "pkcs1"))
 469                         pm = RSA_PKCS1_PADDING;
 470                 else if (!strcmp(value, "sslv23"))
 471                         pm = RSA_SSLV23_PADDING;
 472                 else if (!strcmp(value, "none"))
 473                         pm = RSA_NO_PADDING;
 474                 else if (!strcmp(value, "oeap"))
 475                         pm = RSA_PKCS1_OAEP_PADDING;
 476                 else if (!strcmp(value, "x931"))
 477                         pm = RSA_X931_PADDING;
 478                 else if (!strcmp(value, "pss"))
 479                         pm = RSA_PKCS1_PSS_PADDING;
 480                 else
 481                         {
 482                         RSAerr(RSA_F_PKEY_RSA_CTRL_STR,
 483                                                 RSA_R_UNKNOWN_PADDING_TYPE);
 484                         return -2;
 485                         }
 486                 return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 487                 }
 488
 489         if (!strcmp(type, "rsa_pss_saltlen"))
 490                 {
 491                 int saltlen;
 492                 saltlen = atoi(value);
 493                 return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 494                 }
 495
 496         if (!strcmp(type, "rsa_keygen_bits"))
 497                 {
 498                 int nbits;
 499                 nbits = atoi(value);
 500                 return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
 501                 }
 502
 503         if (!strcmp(type, "rsa_keygen_pubexp"))
 504                 {
 505                 int ret;
 506                 BIGNUM *pubexp = NULL;
 507                 if (!BN_asc2bn(&pubexp, value))
 508                         return 0;
 509                 ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
 510                 if (ret <= 0)
 511                         BN_free(pubexp);
 512                 return ret;
 513                 }
 514
 515         return -2;
 516         }
 517
 518 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 519         {
 520         RSA *rsa = NULL;
 521         RSA_PKEY_CTX *rctx = ctx->data;
 522         BN_GENCB *pcb, cb;
 523         int ret;
 524         if (!rctx->pub_exp)
 525                 {
 526                 rctx->pub_exp = BN_new();
 527                 if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
 528                         return 0;
 529                 }
 530         rsa = RSA_new();
 531         if (!rsa)
 532                 return 0;
 533         if (ctx->pkey_gencb)
 534                 {
 535                 pcb = &cb;
 536                 evp_pkey_set_cb_translate(pcb, ctx);
 537                 }
 538         else
 539                 pcb = NULL;
 540         ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
 541         if (ret > 0)
 542                 EVP_PKEY_assign_RSA(pkey, rsa);
 543         else
 544                 RSA_free(rsa);
 545         return ret;
 546         }
 547
 548 const EVP_PKEY_METHOD rsa_pkey_meth =
 549         {
 550         EVP_PKEY_RSA,
 551         EVP_PKEY_FLAG_AUTOARGLEN,
 552         pkey_rsa_init,
 553         pkey_rsa_copy,
 554         pkey_rsa_cleanup,
 555
 556         0,0,
 557
 558         0,
 559         pkey_rsa_keygen,
 560
 561         0,
 562         pkey_rsa_sign,
 563
 564         0,
 565         pkey_rsa_verify,
 566
 567         0,
 568         pkey_rsa_verifyrecover,
 569
 570
 571         0,0,0,0,
 572
 573         0,
 574         pkey_rsa_encrypt,
 575
 576         0,
 577         pkey_rsa_decrypt,
 578
 579         0,0,
 580
 581         pkey_rsa_ctrl,
 582         pkey_rsa_ctrl_str
 583
 584
 585         };