crypto/rsa/rsa_pmeth.c

   1 /* crypto/rsa/rsa_pmeth.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 2006.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61 #include "cryptlib.h"
  62 #include <openssl/asn1t.h>
  63 #include <openssl/x509.h>
  64 #include <openssl/rsa.h>
  65 #include <openssl/bn.h>
  66 #include <openssl/evp.h>
  67 #include <openssl/x509v3.h>
  68 #ifndef OPENSSL_NO_CMS
  69 # include <openssl/cms.h>
  70 #endif
  71 #include "internal/evp_int.h"
  72 #include "rsa_locl.h"
  73
  74 /* RSA pkey context structure */
  75
  76 typedef struct {
  77     /* Key gen parameters */
  78     int nbits;
  79     BIGNUM *pub_exp;
  80     /* Keygen callback info */
  81     int gentmp[2];
  82     /* RSA padding mode */
  83     int pad_mode;
  84     /* message digest */
  85     const EVP_MD *md;
  86     /* message digest for MGF1 */
  87     const EVP_MD *mgf1md;
  88     /* PSS salt length */
  89     int saltlen;
  90     /* Temp buffer */
  91     unsigned char *tbuf;
  92     /* OAEP label */
  93     unsigned char *oaep_label;
  94     size_t oaep_labellen;
  95 } RSA_PKEY_CTX;
  96
  97 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
  98 {
  99     RSA_PKEY_CTX *rctx;
 100     rctx = OPENSSL_malloc(sizeof(RSA_PKEY_CTX));
 101     if (!rctx)
 102         return 0;
 103     rctx->nbits = 1024;
 104     rctx->pub_exp = NULL;
 105     rctx->pad_mode = RSA_PKCS1_PADDING;
 106     rctx->md = NULL;
 107     rctx->mgf1md = NULL;
 108     rctx->tbuf = NULL;
 109
 110     rctx->saltlen = -2;
 111
 112     rctx->oaep_label = NULL;
 113     rctx->oaep_labellen = 0;
 114
 115     ctx->data = rctx;
 116     ctx->keygen_info = rctx->gentmp;
 117     ctx->keygen_info_count = 2;
 118
 119     return 1;
 120 }
 121
 122 static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
 123 {
 124     RSA_PKEY_CTX *dctx, *sctx;
 125     if (!pkey_rsa_init(dst))
 126         return 0;
 127     sctx = src->data;
 128     dctx = dst->data;
 129     dctx->nbits = sctx->nbits;
 130     if (sctx->pub_exp) {
 131         dctx->pub_exp = BN_dup(sctx->pub_exp);
 132         if (!dctx->pub_exp)
 133             return 0;
 134     }
 135     dctx->pad_mode = sctx->pad_mode;
 136     dctx->md = sctx->md;
 137     dctx->mgf1md = sctx->mgf1md;
 138     if (sctx->oaep_label) {
 139         if (dctx->oaep_label)
 140             OPENSSL_free(dctx->oaep_label);
 141         dctx->oaep_label = BUF_memdup(sctx->oaep_label, sctx->oaep_labellen);
 142         if (!dctx->oaep_label)
 143             return 0;
 144         dctx->oaep_labellen = sctx->oaep_labellen;
 145     }
 146     return 1;
 147 }
 148
 149 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
 150 {
 151     if (ctx->tbuf)
 152         return 1;
 153     ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
 154     if (!ctx->tbuf)
 155         return 0;
 156     return 1;
 157 }
 158
 159 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
 160 {
 161     RSA_PKEY_CTX *rctx = ctx->data;
 162     if (rctx) {
 163         BN_free(rctx->pub_exp);
 164         if (rctx->tbuf)
 165             OPENSSL_free(rctx->tbuf);
 166         if (rctx->oaep_label)
 167             OPENSSL_free(rctx->oaep_label);
 168         OPENSSL_free(rctx);
 169     }
 170 }
 171
 172 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
 173                          size_t *siglen, const unsigned char *tbs,
 174                          size_t tbslen)
 175 {
 176     int ret;
 177     RSA_PKEY_CTX *rctx = ctx->data;
 178     RSA *rsa = ctx->pkey->pkey.rsa;
 179
 180     if (rctx->md) {
 181         if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
 182             RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_INVALID_DIGEST_LENGTH);
 183             return -1;
 184         }
 185
 186         if (EVP_MD_type(rctx->md) == NID_mdc2) {
 187             unsigned int sltmp;
 188             if (rctx->pad_mode != RSA_PKCS1_PADDING)
 189                 return -1;
 190             ret = RSA_sign_ASN1_OCTET_STRING(NID_mdc2,
 191                                              tbs, tbslen, sig, &sltmp, rsa);
 192
 193             if (ret <= 0)
 194                 return ret;
 195             ret = sltmp;
 196         } else if (rctx->pad_mode == RSA_X931_PADDING) {
 197             if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
 198                 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
 199                 return -1;
 200             }
 201             if (!setup_tbuf(rctx, ctx)) {
 202                 RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
 203                 return -1;
 204             }
 205             memcpy(rctx->tbuf, tbs, tbslen);
 206             rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
 207             ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
 208                                       sig, rsa, RSA_X931_PADDING);
 209         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 210             unsigned int sltmp;
 211             ret = RSA_sign(EVP_MD_type(rctx->md),
 212                            tbs, tbslen, sig, &sltmp, rsa);
 213             if (ret <= 0)
 214                 return ret;
 215             ret = sltmp;
 216         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 217             if (!setup_tbuf(rctx, ctx))
 218                 return -1;
 219             if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
 220                                                 rctx->tbuf, tbs,
 221                                                 rctx->md, rctx->mgf1md,
 222                                                 rctx->saltlen))
 223                 return -1;
 224             ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
 225                                       sig, rsa, RSA_NO_PADDING);
 226         } else
 227             return -1;
 228     } else
 229         ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
 230                                   rctx->pad_mode);
 231     if (ret < 0)
 232         return ret;
 233     *siglen = ret;
 234     return 1;
 235 }
 236
 237 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
 238                                   unsigned char *rout, size_t *routlen,
 239                                   const unsigned char *sig, size_t siglen)
 240 {
 241     int ret;
 242     RSA_PKEY_CTX *rctx = ctx->data;
 243
 244     if (rctx->md) {
 245         if (rctx->pad_mode == RSA_X931_PADDING) {
 246             if (!setup_tbuf(rctx, ctx))
 247                 return -1;
 248             ret = RSA_public_decrypt(siglen, sig,
 249                                      rctx->tbuf, ctx->pkey->pkey.rsa,
 250                                      RSA_X931_PADDING);
 251             if (ret < 1)
 252                 return 0;
 253             ret--;
 254             if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
 255                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 256                        RSA_R_ALGORITHM_MISMATCH);
 257                 return 0;
 258             }
 259             if (ret != EVP_MD_size(rctx->md)) {
 260                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 261                        RSA_R_INVALID_DIGEST_LENGTH);
 262                 return 0;
 263             }
 264             if (rout)
 265                 memcpy(rout, rctx->tbuf, ret);
 266         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 267             size_t sltmp;
 268             ret = int_rsa_verify(EVP_MD_type(rctx->md),
 269                                  NULL, 0, rout, &sltmp,
 270                                  sig, siglen, ctx->pkey->pkey.rsa);
 271             if (ret <= 0)
 272                 return 0;
 273             ret = sltmp;
 274         } else
 275             return -1;
 276     } else
 277         ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
 278                                  rctx->pad_mode);
 279     if (ret < 0)
 280         return ret;
 281     *routlen = ret;
 282     return 1;
 283 }
 284
 285 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
 286                            const unsigned char *sig, size_t siglen,
 287                            const unsigned char *tbs, size_t tbslen)
 288 {
 289     RSA_PKEY_CTX *rctx = ctx->data;
 290     RSA *rsa = ctx->pkey->pkey.rsa;
 291     size_t rslen;
 292     if (rctx->md) {
 293         if (rctx->pad_mode == RSA_PKCS1_PADDING)
 294             return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
 295                               sig, siglen, rsa);
 296         if (rctx->pad_mode == RSA_X931_PADDING) {
 297             if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
 298                 return 0;
 299         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 300             int ret;
 301             if (!setup_tbuf(rctx, ctx))
 302                 return -1;
 303             ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 304                                      rsa, RSA_NO_PADDING);
 305             if (ret <= 0)
 306                 return 0;
 307             ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
 308                                             rctx->md, rctx->mgf1md,
 309                                             rctx->tbuf, rctx->saltlen);
 310             if (ret <= 0)
 311                 return 0;
 312             return 1;
 313         } else
 314             return -1;
 315     } else {
 316         if (!setup_tbuf(rctx, ctx))
 317             return -1;
 318         rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 319                                    rsa, rctx->pad_mode);
 320         if (rslen == 0)
 321             return 0;
 322     }
 323
 324     if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
 325         return 0;
 326
 327     return 1;
 328
 329 }
 330
 331 static int pkey_rsa_encrypt(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     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 338         int klen = RSA_size(ctx->pkey->pkey.rsa);
 339         if (!setup_tbuf(rctx, ctx))
 340             return -1;
 341         if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
 342                                              in, inlen,
 343                                              rctx->oaep_label,
 344                                              rctx->oaep_labellen,
 345                                              rctx->md, rctx->mgf1md))
 346             return -1;
 347         ret = RSA_public_encrypt(klen, rctx->tbuf, out,
 348                                  ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 349     } else
 350         ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 351                                  rctx->pad_mode);
 352     if (ret < 0)
 353         return ret;
 354     *outlen = ret;
 355     return 1;
 356 }
 357
 358 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
 359                             unsigned char *out, size_t *outlen,
 360                             const unsigned char *in, size_t inlen)
 361 {
 362     int ret;
 363     RSA_PKEY_CTX *rctx = ctx->data;
 364     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 365         int i;
 366         if (!setup_tbuf(rctx, ctx))
 367             return -1;
 368         ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
 369                                   ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 370         if (ret <= 0)
 371             return ret;
 372         for (i = 0; i < ret; i++) {
 373             if (rctx->tbuf[i])
 374                 break;
 375         }
 376         ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf + i,
 377                                                 ret - i, ret,
 378                                                 rctx->oaep_label,
 379                                                 rctx->oaep_labellen,
 380                                                 rctx->md, rctx->mgf1md);
 381     } else
 382         ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 383                                   rctx->pad_mode);
 384     if (ret < 0)
 385         return ret;
 386     *outlen = ret;
 387     return 1;
 388 }
 389
 390 static int check_padding_md(const EVP_MD *md, int padding)
 391 {
 392     if (!md)
 393         return 1;
 394
 395     if (padding == RSA_NO_PADDING) {
 396         RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
 397         return 0;
 398     }
 399
 400     if (padding == RSA_X931_PADDING) {
 401         if (RSA_X931_hash_id(EVP_MD_type(md)) == -1) {
 402             RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
 403             return 0;
 404         }
 405         return 1;
 406     }
 407
 408     return 1;
 409 }
 410
 411 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 412 {
 413     RSA_PKEY_CTX *rctx = ctx->data;
 414     switch (type) {
 415     case EVP_PKEY_CTRL_RSA_PADDING:
 416         if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
 417             if (!check_padding_md(rctx->md, p1))
 418                 return 0;
 419             if (p1 == RSA_PKCS1_PSS_PADDING) {
 420                 if (!(ctx->operation &
 421                       (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
 422                     goto bad_pad;
 423                 if (!rctx->md)
 424                     rctx->md = EVP_sha1();
 425             }
 426             if (p1 == RSA_PKCS1_OAEP_PADDING) {
 427                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
 428                     goto bad_pad;
 429                 if (!rctx->md)
 430                     rctx->md = EVP_sha1();
 431             }
 432             rctx->pad_mode = p1;
 433             return 1;
 434         }
 435  bad_pad:
 436         RSAerr(RSA_F_PKEY_RSA_CTRL,
 437                RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 438         return -2;
 439
 440     case EVP_PKEY_CTRL_GET_RSA_PADDING:
 441         *(int *)p2 = rctx->pad_mode;
 442         return 1;
 443
 444     case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
 445     case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
 446         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
 447             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 448             return -2;
 449         }
 450         if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN)
 451             *(int *)p2 = rctx->saltlen;
 452         else {
 453             if (p1 < -2)
 454                 return -2;
 455             rctx->saltlen = p1;
 456         }
 457         return 1;
 458
 459     case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
 460         if (p1 < 512) {
 461             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
 462             return -2;
 463         }
 464         rctx->nbits = p1;
 465         return 1;
 466
 467     case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
 468         if (!p2)
 469             return -2;
 470         BN_free(rctx->pub_exp);
 471         rctx->pub_exp = p2;
 472         return 1;
 473
 474     case EVP_PKEY_CTRL_RSA_OAEP_MD:
 475     case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
 476         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 477             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 478             return -2;
 479         }
 480         if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
 481             *(const EVP_MD **)p2 = rctx->md;
 482         else
 483             rctx->md = p2;
 484         return 1;
 485
 486     case EVP_PKEY_CTRL_MD:
 487         if (!check_padding_md(p2, rctx->pad_mode))
 488             return 0;
 489         rctx->md = p2;
 490         return 1;
 491
 492     case EVP_PKEY_CTRL_GET_MD:
 493         *(const EVP_MD **)p2 = rctx->md;
 494         return 1;
 495
 496     case EVP_PKEY_CTRL_RSA_MGF1_MD:
 497     case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
 498         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
 499             && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 500             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
 501             return -2;
 502         }
 503         if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
 504             if (rctx->mgf1md)
 505                 *(const EVP_MD **)p2 = rctx->mgf1md;
 506             else
 507                 *(const EVP_MD **)p2 = rctx->md;
 508         } else
 509             rctx->mgf1md = p2;
 510         return 1;
 511
 512     case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
 513         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 514             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 515             return -2;
 516         }
 517         if (rctx->oaep_label)
 518             OPENSSL_free(rctx->oaep_label);
 519         if (p2 && p1 > 0) {
 520             rctx->oaep_label = p2;
 521             rctx->oaep_labellen = p1;
 522         } else {
 523             rctx->oaep_label = NULL;
 524             rctx->oaep_labellen = 0;
 525         }
 526         return 1;
 527
 528     case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
 529         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 530             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 531             return -2;
 532         }
 533         *(unsigned char **)p2 = rctx->oaep_label;
 534         return rctx->oaep_labellen;
 535
 536     case EVP_PKEY_CTRL_DIGESTINIT:
 537     case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 538     case EVP_PKEY_CTRL_PKCS7_DECRYPT:
 539     case EVP_PKEY_CTRL_PKCS7_SIGN:
 540         return 1;
 541 #ifndef OPENSSL_NO_CMS
 542     case EVP_PKEY_CTRL_CMS_DECRYPT:
 543     case EVP_PKEY_CTRL_CMS_ENCRYPT:
 544     case EVP_PKEY_CTRL_CMS_SIGN:
 545         return 1;
 546 #endif
 547     case EVP_PKEY_CTRL_PEER_KEY:
 548         RSAerr(RSA_F_PKEY_RSA_CTRL,
 549                RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 550         return -2;
 551
 552     default:
 553         return -2;
 554
 555     }
 556 }
 557
 558 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 559                              const char *type, const char *value)
 560 {
 561     if (!value) {
 562         RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
 563         return 0;
 564     }
 565     if (!strcmp(type, "rsa_padding_mode")) {
 566         int pm;
 567         if (!strcmp(value, "pkcs1"))
 568             pm = RSA_PKCS1_PADDING;
 569         else if (!strcmp(value, "sslv23"))
 570             pm = RSA_SSLV23_PADDING;
 571         else if (!strcmp(value, "none"))
 572             pm = RSA_NO_PADDING;
 573         else if (!strcmp(value, "oeap"))
 574             pm = RSA_PKCS1_OAEP_PADDING;
 575         else if (!strcmp(value, "oaep"))
 576             pm = RSA_PKCS1_OAEP_PADDING;
 577         else if (!strcmp(value, "x931"))
 578             pm = RSA_X931_PADDING;
 579         else if (!strcmp(value, "pss"))
 580             pm = RSA_PKCS1_PSS_PADDING;
 581         else {
 582             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
 583             return -2;
 584         }
 585         return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 586     }
 587
 588     if (!strcmp(type, "rsa_pss_saltlen")) {
 589         int saltlen;
 590         saltlen = atoi(value);
 591         return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 592     }
 593
 594     if (!strcmp(type, "rsa_keygen_bits")) {
 595         int nbits;
 596         nbits = atoi(value);
 597         return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
 598     }
 599
 600     if (!strcmp(type, "rsa_keygen_pubexp")) {
 601         int ret;
 602         BIGNUM *pubexp = NULL;
 603         if (!BN_asc2bn(&pubexp, value))
 604             return 0;
 605         ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
 606         if (ret <= 0)
 607             BN_free(pubexp);
 608         return ret;
 609     }
 610
 611     if (!strcmp(type, "rsa_mgf1_md")) {
 612         const EVP_MD *md;
 613         if (!(md = EVP_get_digestbyname(value))) {
 614             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
 615             return 0;
 616         }
 617         return EVP_PKEY_CTX_set_rsa_mgf1_md(ctx, md);
 618     }
 619
 620     if (!strcmp(type, "rsa_oaep_md")) {
 621         const EVP_MD *md;
 622         if (!(md = EVP_get_digestbyname(value))) {
 623             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
 624             return 0;
 625         }
 626         return EVP_PKEY_CTX_set_rsa_oaep_md(ctx, md);
 627     }
 628     if (!strcmp(type, "rsa_oaep_label")) {
 629         unsigned char *lab;
 630         long lablen;
 631         int ret;
 632         lab = string_to_hex(value, &lablen);
 633         if (!lab)
 634             return 0;
 635         ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
 636         if (ret <= 0)
 637             OPENSSL_free(lab);
 638         return ret;
 639     }
 640
 641     return -2;
 642 }
 643
 644 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 645 {
 646     RSA *rsa = NULL;
 647     RSA_PKEY_CTX *rctx = ctx->data;
 648     BN_GENCB *pcb;
 649     int ret;
 650     if (!rctx->pub_exp) {
 651         rctx->pub_exp = BN_new();
 652         if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
 653             return 0;
 654     }
 655     rsa = RSA_new();
 656     if (!rsa)
 657         return 0;
 658     if (ctx->pkey_gencb) {
 659         pcb = BN_GENCB_new();
 660         if (!pcb) {
 661             RSA_free(rsa);
 662             return 0;
 663         }
 664         evp_pkey_set_cb_translate(pcb, ctx);
 665     } else
 666         pcb = NULL;
 667     ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
 668     BN_GENCB_free(pcb);
 669     if (ret > 0)
 670         EVP_PKEY_assign_RSA(pkey, rsa);
 671     else
 672         RSA_free(rsa);
 673     return ret;
 674 }
 675
 676 const EVP_PKEY_METHOD rsa_pkey_meth = {
 677     EVP_PKEY_RSA,
 678     EVP_PKEY_FLAG_AUTOARGLEN,
 679     pkey_rsa_init,
 680     pkey_rsa_copy,
 681     pkey_rsa_cleanup,
 682
 683     0, 0,
 684
 685     0,
 686     pkey_rsa_keygen,
 687
 688     0,
 689     pkey_rsa_sign,
 690
 691     0,
 692     pkey_rsa_verify,
 693
 694     0,
 695     pkey_rsa_verifyrecover,
 696
 697     0, 0, 0, 0,
 698
 699     0,
 700     pkey_rsa_encrypt,
 701
 702     0,
 703     pkey_rsa_decrypt,
 704
 705     0, 0,
 706
 707     pkey_rsa_ctrl,
 708     pkey_rsa_ctrl_str
 709 };