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/evp.h>
  65 #include "evp_locl.h"
  66
  67 extern int int_rsa_verify(int dtype, const unsigned char *m, size_t m_len,
  68                 unsigned char *rm, size_t *prm_len,
  69                 const unsigned char *sigbuf, size_t siglen,
  70                 RSA *rsa);
  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         /* PSS/OAEP salt length */
  86         int saltlen;
  87         /* Temp buffer */
  88         unsigned char *tbuf;
  89         } RSA_PKEY_CTX;
  90
  91 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
  92         {
  93         RSA_PKEY_CTX *rctx;
  94         rctx = OPENSSL_malloc(sizeof(RSA_PKEY_CTX));
  95         if (!rctx)
  96                 return 0;
  97         rctx->nbits = 1024;
  98         rctx->pub_exp = NULL;
  99         rctx->pad_mode = RSA_PKCS1_PADDING;
 100         rctx->md = 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(rsa, rctx->tbuf, tbs,
 193                                                 rctx->md, rctx->saltlen))
 194                                 return -1;
 195                         ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
 196                                                 sig, rsa, RSA_NO_PADDING);
 197                         }
 198                 else
 199                         return -1;
 200                 }
 201         else
 202                 ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
 203                                                         rctx->pad_mode);
 204         if (ret < 0)
 205                 return ret;
 206         *siglen = ret;
 207         return 1;
 208         }
 209
 210
 211 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
 212                                         unsigned char *rout, size_t *routlen,
 213                                         const unsigned char *sig, size_t siglen)
 214         {
 215         int ret;
 216         RSA_PKEY_CTX *rctx = ctx->data;
 217
 218         if (rctx->md)
 219                 {
 220                 if (rctx->pad_mode == RSA_X931_PADDING)
 221                         {
 222                         if (!setup_tbuf(rctx, ctx))
 223                                 return -1;
 224                         ret = RSA_public_decrypt(siglen, sig,
 225                                                 rctx->tbuf, ctx->pkey->pkey.rsa,
 226                                                 RSA_X931_PADDING);
 227                         if (ret < 1)
 228                                 return 0;
 229                         ret--;
 230                         if (rctx->tbuf[ret] !=
 231                                 RSA_X931_hash_id(EVP_MD_type(rctx->md)))
 232                                 {
 233                                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 234                                                 RSA_R_ALGORITHM_MISMATCH);
 235                                 return 0;
 236                                 }
 237                         if (ret != EVP_MD_size(rctx->md))
 238                                 {
 239                                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 240                                         RSA_R_INVALID_DIGEST_LENGTH);
 241                                 return 0;
 242                                 }
 243                         if (rout)
 244                                 memcpy(rout, rctx->tbuf, ret);
 245                         }
 246                 else if (rctx->pad_mode == RSA_PKCS1_PADDING)
 247                         {
 248                         unsigned int sltmp;
 249                         ret = int_rsa_verify(EVP_MD_type(rctx->md),
 250                                                 NULL, 0, rout, &sltmp,
 251                                         sig, siglen, ctx->pkey->pkey.rsa);
 252                         ret = sltmp;
 253                         }
 254                 else
 255                         return -1;
 256                 }
 257         else
 258                 ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
 259                                                         rctx->pad_mode);
 260         if (ret < 0)
 261                 return ret;
 262         *routlen = ret;
 263         return 1;
 264         }
 265
 266 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
 267                                         const unsigned char *sig, size_t siglen,
 268                                         const unsigned char *tbs, size_t tbslen)
 269         {
 270         RSA_PKEY_CTX *rctx = ctx->data;
 271         RSA *rsa = ctx->pkey->pkey.rsa;
 272         size_t rslen;
 273         if (rctx->md)
 274                 {
 275                 if (rctx->pad_mode == RSA_PKCS1_PADDING)
 276                         return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
 277                                         sig, siglen, rsa);
 278                 if (rctx->pad_mode == RSA_X931_PADDING)
 279                         {
 280                         if (pkey_rsa_verifyrecover(ctx, NULL, &rslen,
 281                                         sig, siglen) <= 0)
 282                                 return 0;
 283                         }
 284                 else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
 285                         {
 286                         int ret;
 287                         if (!setup_tbuf(rctx, ctx))
 288                                 return -1;
 289                         ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 290                                                         rsa, RSA_NO_PADDING);
 291                         if (ret <= 0)
 292                                 return 0;
 293                         ret = RSA_verify_PKCS1_PSS(rsa, tbs, rctx->md,
 294                                                 rctx->tbuf, rctx->saltlen);
 295                         if (ret <= 0)
 296                                 return 0;
 297                         return 1;
 298                         }
 299                 else
 300                         return -1;
 301                 }
 302         else
 303                 {
 304                 if (!setup_tbuf(rctx, ctx))
 305                         return -1;
 306                 rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 307                                                 rsa, rctx->pad_mode);
 308                 if (rslen == 0)
 309                         return 0;
 310                 }
 311
 312         if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
 313                 return 0;
 314
 315         return 1;
 316
 317         }
 318
 319
 320 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
 321                                         unsigned char *out, size_t *outlen,
 322                                         const unsigned char *in, size_t inlen)
 323         {
 324         int ret;
 325         RSA_PKEY_CTX *rctx = ctx->data;
 326         ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 327                                                         rctx->pad_mode);
 328         if (ret < 0)
 329                 return ret;
 330         *outlen = ret;
 331         return 1;
 332         }
 333
 334 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
 335                                         unsigned char *out, size_t *outlen,
 336                                         const unsigned char *in, size_t inlen)
 337         {
 338         int ret;
 339         RSA_PKEY_CTX *rctx = ctx->data;
 340         ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 341                                                         rctx->pad_mode);
 342         if (ret < 0)
 343                 return ret;
 344         *outlen = ret;
 345         return 1;
 346         }
 347
 348 static int check_padding_md(const EVP_MD *md, int padding)
 349         {
 350         if (!md)
 351                 return 1;
 352
 353         if (padding == RSA_NO_PADDING)
 354                 {
 355                 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
 356                 return 0;
 357                 }
 358
 359         if (padding == RSA_X931_PADDING)
 360                 {
 361                 if (RSA_X931_hash_id(EVP_MD_type(md)) == -1)
 362                         {
 363                         RSAerr(RSA_F_CHECK_PADDING_MD,
 364                                                 RSA_R_INVALID_X931_DIGEST);
 365                         return 0;
 366                         }
 367                 return 1;
 368                 }
 369
 370         return 1;
 371         }
 372
 373
 374 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 375         {
 376         RSA_PKEY_CTX *rctx = ctx->data;
 377         switch (type)
 378                 {
 379                 case EVP_PKEY_CTRL_RSA_PADDING:
 380                 if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING))
 381                         {
 382                         if (!check_padding_md(rctx->md, p1))
 383                                 return 0;
 384                         if (p1 == RSA_PKCS1_PSS_PADDING)
 385                                 {
 386                                 if (!(ctx->operation &
 387                                      (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
 388                                         goto bad_pad;
 389                                 if (!rctx->md)
 390                                         rctx->md = EVP_sha1();
 391                                 }
 392                         if (p1 == RSA_PKCS1_OAEP_PADDING)
 393                                 {
 394                                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
 395                                         goto bad_pad;
 396                                 if (!rctx->md)
 397                                         rctx->md = EVP_sha1();
 398                                 }
 399                         rctx->pad_mode = p1;
 400                         return 1;
 401                         }
 402                 bad_pad:
 403                 RSAerr(RSA_F_PKEY_RSA_CTRL,
 404                                 RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 405                 return -2;
 406
 407                 case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
 408                 if (p1 < -2)
 409                         return -2;
 410                 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING)
 411                         {
 412                         RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 413                         return -2;
 414                         }
 415                 rctx->saltlen = p1;
 416                 return 1;
 417
 418                 case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
 419                 if (p1 < 256)
 420                         {
 421                         RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_KEYBITS);
 422                         return -2;
 423                         }
 424                 rctx->nbits = p1;
 425                 return 1;
 426
 427                 case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
 428                 if (!p2)
 429                         return -2;
 430                 rctx->pub_exp = p2;
 431                 return 1;
 432
 433                 case EVP_PKEY_CTRL_MD:
 434                 if (!check_padding_md(p2, rctx->pad_mode))
 435                         return 0;
 436                 rctx->md = p2;
 437                 return 1;
 438
 439                 case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 440                 case EVP_PKEY_CTRL_PKCS7_DECRYPT:
 441                 case EVP_PKEY_CTRL_PKCS7_SIGN:
 442                 return 1;
 443
 444                 default:
 445                 return -2;
 446
 447                 }
 448         }
 449
 450 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 451                         const char *type, const char *value)
 452         {
 453         if (!value)
 454                 {
 455                 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
 456                 return 0;
 457                 }
 458         if (!strcmp(type, "rsa_padding_mode"))
 459                 {
 460                 int pm;
 461                 if (!strcmp(value, "pkcs1"))
 462                         pm = RSA_PKCS1_PADDING;
 463                 else if (!strcmp(value, "sslv23"))
 464                         pm = RSA_SSLV23_PADDING;
 465                 else if (!strcmp(value, "none"))
 466                         pm = RSA_NO_PADDING;
 467                 else if (!strcmp(value, "oeap"))
 468                         pm = RSA_PKCS1_OAEP_PADDING;
 469                 else if (!strcmp(value, "x931"))
 470                         pm = RSA_X931_PADDING;
 471                 else if (!strcmp(value, "pss"))
 472                         pm = RSA_PKCS1_PSS_PADDING;
 473                 else
 474                         {
 475                         RSAerr(RSA_F_PKEY_RSA_CTRL_STR,
 476                                                 RSA_R_UNKNOWN_PADDING_TYPE);
 477                         return -2;
 478                         }
 479                 return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 480                 }
 481
 482         if (!strcmp(type, "rsa_pss_saltlen"))
 483                 {
 484                 int saltlen;
 485                 saltlen = atoi(value);
 486                 return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 487                 }
 488
 489         if (!strcmp(type, "rsa_keygen_bits"))
 490                 {
 491                 int nbits;
 492                 nbits = atoi(value);
 493                 return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
 494                 }
 495
 496         if (!strcmp(type, "rsa_keygen_pubexp"))
 497                 {
 498                 int ret;
 499                 BIGNUM *pubexp = NULL;
 500                 if (!BN_asc2bn(&pubexp, value))
 501                         return 0;
 502                 ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
 503                 if (ret <= 0)
 504                         BN_free(pubexp);
 505                 return ret;
 506                 }
 507
 508         return -2;
 509         }
 510
 511 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 512         {
 513         RSA *rsa = NULL;
 514         RSA_PKEY_CTX *rctx = ctx->data;
 515         BN_GENCB *pcb, cb;
 516         int ret;
 517         if (!rctx->pub_exp)
 518                 {
 519                 rctx->pub_exp = BN_new();
 520                 if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
 521                         return 0;
 522                 }
 523         rsa = RSA_new();
 524         if (!rsa)
 525                 return 0;
 526         if (ctx->pkey_gencb)
 527                 {
 528                 pcb = &cb;
 529                 evp_pkey_set_cb_translate(pcb, ctx);
 530                 }
 531         else
 532                 pcb = NULL;
 533         ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
 534         if (ret > 0)
 535                 EVP_PKEY_assign_RSA(pkey, rsa);
 536         else
 537                 RSA_free(rsa);
 538         return ret;
 539         }
 540
 541 const EVP_PKEY_METHOD rsa_pkey_meth =
 542         {
 543         EVP_PKEY_RSA,
 544         EVP_PKEY_FLAG_AUTOARGLEN,
 545         pkey_rsa_init,
 546         pkey_rsa_copy,
 547         pkey_rsa_cleanup,
 548
 549         0,0,
 550
 551         0,
 552         pkey_rsa_keygen,
 553
 554         0,
 555         pkey_rsa_sign,
 556
 557         0,
 558         pkey_rsa_verify,
 559
 560         0,
 561         pkey_rsa_verifyrecover,
 562
 563
 564         0,0,0,0,
 565
 566         0,
 567         pkey_rsa_encrypt,
 568
 569         0,
 570         pkey_rsa_decrypt,
 571
 572         0,0,
 573
 574         pkey_rsa_ctrl,
 575         pkey_rsa_ctrl_str
 576
 577
 578         };