crypto/rsa/rsa_pmeth.c

   1 /*
   2  * Copyright 2006-2019 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "internal/constant_time_locl.h"
  11
  12 #include <stdio.h>
  13 #include "internal/cryptlib.h"
  14 #include <openssl/asn1t.h>
  15 #include <openssl/x509.h>
  16 #include <openssl/rsa.h>
  17 #include <openssl/bn.h>
  18 #include <openssl/evp.h>
  19 #include <openssl/x509v3.h>
  20 #include <openssl/cms.h>
  21 #include "internal/evp_int.h"
  22 #include "rsa_locl.h"
  23
  24 /* RSA pkey context structure */
  25
  26 typedef struct {
  27     /* Key gen parameters */
  28     int nbits;
  29     BIGNUM *pub_exp;
  30     int primes;
  31     /* Keygen callback info */
  32     int gentmp[2];
  33     /* RSA padding mode */
  34     int pad_mode;
  35     /* message digest */
  36     const EVP_MD *md;
  37     /* message digest for MGF1 */
  38     const EVP_MD *mgf1md;
  39     /* PSS salt length */
  40     int saltlen;
  41     /* Minimum salt length or -1 if no PSS parameter restriction */
  42     int min_saltlen;
  43     /* Temp buffer */
  44     unsigned char *tbuf;
  45     /* OAEP label */
  46     unsigned char *oaep_label;
  47     size_t oaep_labellen;
  48 } RSA_PKEY_CTX;
  49
  50 /* True if PSS parameters are restricted */
  51 #define rsa_pss_restricted(rctx) (rctx->min_saltlen != -1)
  52
  53 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
  54 {
  55     RSA_PKEY_CTX *rctx = OPENSSL_zalloc(sizeof(*rctx));
  56
  57     if (rctx == NULL)
  58         return 0;
  59     rctx->nbits = 1024;
  60     rctx->primes = RSA_DEFAULT_PRIME_NUM;
  61     if (pkey_ctx_is_pss(ctx))
  62         rctx->pad_mode = RSA_PKCS1_PSS_PADDING;
  63     else
  64         rctx->pad_mode = RSA_PKCS1_PADDING;
  65     /* Maximum for sign, auto for verify */
  66     rctx->saltlen = RSA_PSS_SALTLEN_AUTO;
  67     rctx->min_saltlen = -1;
  68     ctx->data = rctx;
  69     ctx->keygen_info = rctx->gentmp;
  70     ctx->keygen_info_count = 2;
  71
  72     return 1;
  73 }
  74
  75 static int pkey_rsa_copy(EVP_PKEY_CTX *dst, const EVP_PKEY_CTX *src)
  76 {
  77     RSA_PKEY_CTX *dctx, *sctx;
  78
  79     if (!pkey_rsa_init(dst))
  80         return 0;
  81     sctx = src->data;
  82     dctx = dst->data;
  83     dctx->nbits = sctx->nbits;
  84     if (sctx->pub_exp) {
  85         dctx->pub_exp = BN_dup(sctx->pub_exp);
  86         if (!dctx->pub_exp)
  87             return 0;
  88     }
  89     dctx->pad_mode = sctx->pad_mode;
  90     dctx->md = sctx->md;
  91     dctx->mgf1md = sctx->mgf1md;
  92     if (sctx->oaep_label) {
  93         OPENSSL_free(dctx->oaep_label);
  94         dctx->oaep_label = OPENSSL_memdup(sctx->oaep_label, sctx->oaep_labellen);
  95         if (!dctx->oaep_label)
  96             return 0;
  97         dctx->oaep_labellen = sctx->oaep_labellen;
  98     }
  99     return 1;
 100 }
 101
 102 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
 103 {
 104     if (ctx->tbuf != NULL)
 105         return 1;
 106     if ((ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey))) == NULL) {
 107         RSAerr(RSA_F_SETUP_TBUF, ERR_R_MALLOC_FAILURE);
 108         return 0;
 109     }
 110     return 1;
 111 }
 112
 113 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
 114 {
 115     RSA_PKEY_CTX *rctx = ctx->data;
 116     if (rctx) {
 117         BN_free(rctx->pub_exp);
 118         OPENSSL_free(rctx->tbuf);
 119         OPENSSL_free(rctx->oaep_label);
 120         OPENSSL_free(rctx);
 121     }
 122 }
 123
 124 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
 125                          size_t *siglen, const unsigned char *tbs,
 126                          size_t tbslen)
 127 {
 128     int ret;
 129     RSA_PKEY_CTX *rctx = ctx->data;
 130     RSA *rsa = ctx->pkey->pkey.rsa;
 131
 132     if (rctx->md) {
 133         if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
 134             RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_INVALID_DIGEST_LENGTH);
 135             return -1;
 136         }
 137
 138         if (EVP_MD_type(rctx->md) == NID_mdc2) {
 139             unsigned int sltmp;
 140             if (rctx->pad_mode != RSA_PKCS1_PADDING)
 141                 return -1;
 142             ret = RSA_sign_ASN1_OCTET_STRING(0,
 143                                              tbs, tbslen, sig, &sltmp, rsa);
 144
 145             if (ret <= 0)
 146                 return ret;
 147             ret = sltmp;
 148         } else if (rctx->pad_mode == RSA_X931_PADDING) {
 149             if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
 150                 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
 151                 return -1;
 152             }
 153             if (!setup_tbuf(rctx, ctx)) {
 154                 RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
 155                 return -1;
 156             }
 157             memcpy(rctx->tbuf, tbs, tbslen);
 158             rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
 159             ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
 160                                       sig, rsa, RSA_X931_PADDING);
 161         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 162             unsigned int sltmp;
 163             ret = RSA_sign(EVP_MD_type(rctx->md),
 164                            tbs, tbslen, sig, &sltmp, rsa);
 165             if (ret <= 0)
 166                 return ret;
 167             ret = sltmp;
 168         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 169             if (!setup_tbuf(rctx, ctx))
 170                 return -1;
 171             if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
 172                                                 rctx->tbuf, tbs,
 173                                                 rctx->md, rctx->mgf1md,
 174                                                 rctx->saltlen))
 175                 return -1;
 176             ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
 177                                       sig, rsa, RSA_NO_PADDING);
 178         } else {
 179             return -1;
 180         }
 181     } else {
 182         ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
 183                                   rctx->pad_mode);
 184     }
 185     if (ret < 0)
 186         return ret;
 187     *siglen = ret;
 188     return 1;
 189 }
 190
 191 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
 192                                   unsigned char *rout, size_t *routlen,
 193                                   const unsigned char *sig, size_t siglen)
 194 {
 195     int ret;
 196     RSA_PKEY_CTX *rctx = ctx->data;
 197
 198     if (rctx->md) {
 199         if (rctx->pad_mode == RSA_X931_PADDING) {
 200             if (!setup_tbuf(rctx, ctx))
 201                 return -1;
 202             ret = RSA_public_decrypt(siglen, sig,
 203                                      rctx->tbuf, ctx->pkey->pkey.rsa,
 204                                      RSA_X931_PADDING);
 205             if (ret < 1)
 206                 return 0;
 207             ret--;
 208             if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
 209                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 210                        RSA_R_ALGORITHM_MISMATCH);
 211                 return 0;
 212             }
 213             if (ret != EVP_MD_size(rctx->md)) {
 214                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 215                        RSA_R_INVALID_DIGEST_LENGTH);
 216                 return 0;
 217             }
 218             if (rout)
 219                 memcpy(rout, rctx->tbuf, ret);
 220         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 221             size_t sltmp;
 222             ret = int_rsa_verify(EVP_MD_type(rctx->md),
 223                                  NULL, 0, rout, &sltmp,
 224                                  sig, siglen, ctx->pkey->pkey.rsa);
 225             if (ret <= 0)
 226                 return 0;
 227             ret = sltmp;
 228         } else {
 229             return -1;
 230         }
 231     } else {
 232         ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
 233                                  rctx->pad_mode);
 234     }
 235     if (ret < 0)
 236         return ret;
 237     *routlen = ret;
 238     return 1;
 239 }
 240
 241 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
 242                            const unsigned char *sig, size_t siglen,
 243                            const unsigned char *tbs, size_t tbslen)
 244 {
 245     RSA_PKEY_CTX *rctx = ctx->data;
 246     RSA *rsa = ctx->pkey->pkey.rsa;
 247     size_t rslen;
 248
 249     if (rctx->md) {
 250         if (rctx->pad_mode == RSA_PKCS1_PADDING)
 251             return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
 252                               sig, siglen, rsa);
 253         if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
 254             RSAerr(RSA_F_PKEY_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH);
 255             return -1;
 256         }
 257         if (rctx->pad_mode == RSA_X931_PADDING) {
 258             if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
 259                 return 0;
 260         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 261             int ret;
 262             if (!setup_tbuf(rctx, ctx))
 263                 return -1;
 264             ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 265                                      rsa, RSA_NO_PADDING);
 266             if (ret <= 0)
 267                 return 0;
 268             ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
 269                                             rctx->md, rctx->mgf1md,
 270                                             rctx->tbuf, rctx->saltlen);
 271             if (ret <= 0)
 272                 return 0;
 273             return 1;
 274         } else {
 275             return -1;
 276         }
 277     } else {
 278         if (!setup_tbuf(rctx, ctx))
 279             return -1;
 280         rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 281                                    rsa, rctx->pad_mode);
 282         if (rslen == 0)
 283             return 0;
 284     }
 285
 286     if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
 287         return 0;
 288
 289     return 1;
 290
 291 }
 292
 293 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
 294                             unsigned char *out, size_t *outlen,
 295                             const unsigned char *in, size_t inlen)
 296 {
 297     int ret;
 298     RSA_PKEY_CTX *rctx = ctx->data;
 299
 300     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 301         int klen = RSA_size(ctx->pkey->pkey.rsa);
 302         if (!setup_tbuf(rctx, ctx))
 303             return -1;
 304         if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
 305                                              in, inlen,
 306                                              rctx->oaep_label,
 307                                              rctx->oaep_labellen,
 308                                              rctx->md, rctx->mgf1md))
 309             return -1;
 310         ret = RSA_public_encrypt(klen, rctx->tbuf, out,
 311                                  ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 312     } else {
 313         ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 314                                  rctx->pad_mode);
 315     }
 316     if (ret < 0)
 317         return ret;
 318     *outlen = ret;
 319     return 1;
 320 }
 321
 322 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
 323                             unsigned char *out, size_t *outlen,
 324                             const unsigned char *in, size_t inlen)
 325 {
 326     int ret;
 327     RSA_PKEY_CTX *rctx = ctx->data;
 328
 329     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 330         if (!setup_tbuf(rctx, ctx))
 331             return -1;
 332         ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
 333                                   ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 334         if (ret <= 0)
 335             return ret;
 336         ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf,
 337                                                 ret, ret,
 338                                                 rctx->oaep_label,
 339                                                 rctx->oaep_labellen,
 340                                                 rctx->md, rctx->mgf1md);
 341     } else {
 342         ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 343                                   rctx->pad_mode);
 344     }
 345     *outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
 346     ret = constant_time_select_int(constant_time_msb(ret), ret, 1);
 347     return ret;
 348 }
 349
 350 static int check_padding_md(const EVP_MD *md, int padding)
 351 {
 352     int mdnid;
 353
 354     if (!md)
 355         return 1;
 356
 357     mdnid = EVP_MD_type(md);
 358
 359     if (padding == RSA_NO_PADDING) {
 360         RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
 361         return 0;
 362     }
 363
 364     if (padding == RSA_X931_PADDING) {
 365         if (RSA_X931_hash_id(mdnid) == -1) {
 366             RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
 367             return 0;
 368         }
 369     } else {
 370         switch(mdnid) {
 371         /* List of all supported RSA digests */
 372         case NID_sha1:
 373         case NID_sha224:
 374         case NID_sha256:
 375         case NID_sha384:
 376         case NID_sha512:
 377         case NID_md5:
 378         case NID_md5_sha1:
 379         case NID_md2:
 380         case NID_md4:
 381         case NID_mdc2:
 382         case NID_ripemd160:
 383         case NID_sha3_224:
 384         case NID_sha3_256:
 385         case NID_sha3_384:
 386         case NID_sha3_512:
 387             return 1;
 388
 389         default:
 390             RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_DIGEST);
 391             return 0;
 392
 393         }
 394     }
 395
 396     return 1;
 397 }
 398
 399 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 400 {
 401     RSA_PKEY_CTX *rctx = ctx->data;
 402
 403     switch (type) {
 404     case EVP_PKEY_CTRL_RSA_PADDING:
 405         if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
 406             if (!check_padding_md(rctx->md, p1))
 407                 return 0;
 408             if (p1 == RSA_PKCS1_PSS_PADDING) {
 409                 if (!(ctx->operation &
 410                       (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
 411                     goto bad_pad;
 412                 if (!rctx->md)
 413                     rctx->md = EVP_sha1();
 414             } else if (pkey_ctx_is_pss(ctx)) {
 415                 goto bad_pad;
 416             }
 417             if (p1 == RSA_PKCS1_OAEP_PADDING) {
 418                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
 419                     goto bad_pad;
 420                 if (!rctx->md)
 421                     rctx->md = EVP_sha1();
 422             }
 423             rctx->pad_mode = p1;
 424             return 1;
 425         }
 426  bad_pad:
 427         RSAerr(RSA_F_PKEY_RSA_CTRL,
 428                RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 429         return -2;
 430
 431     case EVP_PKEY_CTRL_GET_RSA_PADDING:
 432         *(int *)p2 = rctx->pad_mode;
 433         return 1;
 434
 435     case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
 436     case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
 437         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
 438             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 439             return -2;
 440         }
 441         if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN) {
 442             *(int *)p2 = rctx->saltlen;
 443         } else {
 444             if (p1 < RSA_PSS_SALTLEN_MAX)
 445                 return -2;
 446             if (rsa_pss_restricted(rctx)) {
 447                 if (p1 == RSA_PSS_SALTLEN_AUTO
 448                     && ctx->operation == EVP_PKEY_OP_VERIFY) {
 449                     RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 450                     return -2;
 451                 }
 452                 if ((p1 == RSA_PSS_SALTLEN_DIGEST
 453                      && rctx->min_saltlen > EVP_MD_size(rctx->md))
 454                     || (p1 >= 0 && p1 < rctx->min_saltlen)) {
 455                     RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_PSS_SALTLEN_TOO_SMALL);
 456                     return 0;
 457                 }
 458             }
 459             rctx->saltlen = p1;
 460         }
 461         return 1;
 462
 463     case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
 464         if (p1 < RSA_MIN_MODULUS_BITS) {
 465             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
 466             return -2;
 467         }
 468         rctx->nbits = p1;
 469         return 1;
 470
 471     case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
 472         if (p2 == NULL || !BN_is_odd((BIGNUM *)p2) || BN_is_one((BIGNUM *)p2)) {
 473             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_BAD_E_VALUE);
 474             return -2;
 475         }
 476         BN_free(rctx->pub_exp);
 477         rctx->pub_exp = p2;
 478         return 1;
 479
 480     case EVP_PKEY_CTRL_RSA_KEYGEN_PRIMES:
 481         if (p1 < RSA_DEFAULT_PRIME_NUM || p1 > RSA_MAX_PRIME_NUM) {
 482             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_PRIME_NUM_INVALID);
 483             return -2;
 484         }
 485         rctx->primes = p1;
 486         return 1;
 487
 488     case EVP_PKEY_CTRL_RSA_OAEP_MD:
 489     case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
 490         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 491             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 492             return -2;
 493         }
 494         if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
 495             *(const EVP_MD **)p2 = rctx->md;
 496         else
 497             rctx->md = p2;
 498         return 1;
 499
 500     case EVP_PKEY_CTRL_MD:
 501         if (!check_padding_md(p2, rctx->pad_mode))
 502             return 0;
 503         if (rsa_pss_restricted(rctx)) {
 504             if (EVP_MD_type(rctx->md) == EVP_MD_type(p2))
 505                 return 1;
 506             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_DIGEST_NOT_ALLOWED);
 507             return 0;
 508         }
 509         rctx->md = p2;
 510         return 1;
 511
 512     case EVP_PKEY_CTRL_GET_MD:
 513         *(const EVP_MD **)p2 = rctx->md;
 514         return 1;
 515
 516     case EVP_PKEY_CTRL_RSA_MGF1_MD:
 517     case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
 518         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
 519             && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 520             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
 521             return -2;
 522         }
 523         if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
 524             if (rctx->mgf1md)
 525                 *(const EVP_MD **)p2 = rctx->mgf1md;
 526             else
 527                 *(const EVP_MD **)p2 = rctx->md;
 528         } else {
 529             if (rsa_pss_restricted(rctx)) {
 530                 if (EVP_MD_type(rctx->mgf1md) == EVP_MD_type(p2))
 531                     return 1;
 532                 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_MGF1_DIGEST_NOT_ALLOWED);
 533                 return 0;
 534             }
 535             rctx->mgf1md = p2;
 536         }
 537         return 1;
 538
 539     case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
 540         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 541             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 542             return -2;
 543         }
 544         OPENSSL_free(rctx->oaep_label);
 545         if (p2 && p1 > 0) {
 546             rctx->oaep_label = p2;
 547             rctx->oaep_labellen = p1;
 548         } else {
 549             rctx->oaep_label = NULL;
 550             rctx->oaep_labellen = 0;
 551         }
 552         return 1;
 553
 554     case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
 555         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 556             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 557             return -2;
 558         }
 559         *(unsigned char **)p2 = rctx->oaep_label;
 560         return rctx->oaep_labellen;
 561
 562     case EVP_PKEY_CTRL_DIGESTINIT:
 563     case EVP_PKEY_CTRL_PKCS7_SIGN:
 564 #ifndef OPENSSL_NO_CMS
 565     case EVP_PKEY_CTRL_CMS_SIGN:
 566 #endif
 567     return 1;
 568
 569     case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 570     case EVP_PKEY_CTRL_PKCS7_DECRYPT:
 571 #ifndef OPENSSL_NO_CMS
 572     case EVP_PKEY_CTRL_CMS_DECRYPT:
 573     case EVP_PKEY_CTRL_CMS_ENCRYPT:
 574 #endif
 575     if (!pkey_ctx_is_pss(ctx))
 576         return 1;
 577     /* fall through */
 578     case EVP_PKEY_CTRL_PEER_KEY:
 579         RSAerr(RSA_F_PKEY_RSA_CTRL,
 580                RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 581         return -2;
 582
 583     default:
 584         return -2;
 585
 586     }
 587 }
 588
 589 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 590                              const char *type, const char *value)
 591 {
 592     if (value == NULL) {
 593         RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
 594         return 0;
 595     }
 596     if (strcmp(type, "rsa_padding_mode") == 0) {
 597         int pm;
 598
 599         if (strcmp(value, "pkcs1") == 0) {
 600             pm = RSA_PKCS1_PADDING;
 601         } else if (strcmp(value, "sslv23") == 0) {
 602             pm = RSA_SSLV23_PADDING;
 603         } else if (strcmp(value, "none") == 0) {
 604             pm = RSA_NO_PADDING;
 605         } else if (strcmp(value, "oeap") == 0) {
 606             pm = RSA_PKCS1_OAEP_PADDING;
 607         } else if (strcmp(value, "oaep") == 0) {
 608             pm = RSA_PKCS1_OAEP_PADDING;
 609         } else if (strcmp(value, "x931") == 0) {
 610             pm = RSA_X931_PADDING;
 611         } else if (strcmp(value, "pss") == 0) {
 612             pm = RSA_PKCS1_PSS_PADDING;
 613         } else {
 614             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
 615             return -2;
 616         }
 617         return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 618     }
 619
 620     if (strcmp(type, "rsa_pss_saltlen") == 0) {
 621         int saltlen;
 622
 623         if (!strcmp(value, "digest"))
 624             saltlen = RSA_PSS_SALTLEN_DIGEST;
 625         else if (!strcmp(value, "max"))
 626             saltlen = RSA_PSS_SALTLEN_MAX;
 627         else if (!strcmp(value, "auto"))
 628             saltlen = RSA_PSS_SALTLEN_AUTO;
 629         else
 630             saltlen = atoi(value);
 631         return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 632     }
 633
 634     if (strcmp(type, "rsa_keygen_bits") == 0) {
 635         int nbits = atoi(value);
 636
 637         return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
 638     }
 639
 640     if (strcmp(type, "rsa_keygen_pubexp") == 0) {
 641         int ret;
 642
 643         BIGNUM *pubexp = NULL;
 644         if (!BN_asc2bn(&pubexp, value))
 645             return 0;
 646         ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
 647         if (ret <= 0)
 648             BN_free(pubexp);
 649         return ret;
 650     }
 651
 652     if (strcmp(type, "rsa_keygen_primes") == 0) {
 653         int nprimes = atoi(value);
 654
 655         return EVP_PKEY_CTX_set_rsa_keygen_primes(ctx, nprimes);
 656     }
 657
 658     if (strcmp(type, "rsa_mgf1_md") == 0)
 659         return EVP_PKEY_CTX_md(ctx,
 660                                EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
 661                                EVP_PKEY_CTRL_RSA_MGF1_MD, value);
 662
 663     if (pkey_ctx_is_pss(ctx)) {
 664
 665         if (strcmp(type, "rsa_pss_keygen_mgf1_md") == 0)
 666             return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
 667                                    EVP_PKEY_CTRL_RSA_MGF1_MD, value);
 668
 669         if (strcmp(type, "rsa_pss_keygen_md") == 0)
 670             return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
 671                                    EVP_PKEY_CTRL_MD, value);
 672
 673         if (strcmp(type, "rsa_pss_keygen_saltlen") == 0) {
 674             int saltlen = atoi(value);
 675
 676             return EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(ctx, saltlen);
 677         }
 678     }
 679
 680     if (strcmp(type, "rsa_oaep_md") == 0)
 681         return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_TYPE_CRYPT,
 682                                EVP_PKEY_CTRL_RSA_OAEP_MD, value);
 683
 684     if (strcmp(type, "rsa_oaep_label") == 0) {
 685         unsigned char *lab;
 686         long lablen;
 687         int ret;
 688
 689         lab = OPENSSL_hexstr2buf(value, &lablen);
 690         if (!lab)
 691             return 0;
 692         ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
 693         if (ret <= 0)
 694             OPENSSL_free(lab);
 695         return ret;
 696     }
 697
 698     return -2;
 699 }
 700
 701 /* Set PSS parameters when generating a key, if necessary */
 702 static int rsa_set_pss_param(RSA *rsa, EVP_PKEY_CTX *ctx)
 703 {
 704     RSA_PKEY_CTX *rctx = ctx->data;
 705
 706     if (!pkey_ctx_is_pss(ctx))
 707         return 1;
 708     /* If all parameters are default values don't set pss */
 709     if (rctx->md == NULL && rctx->mgf1md == NULL && rctx->saltlen == -2)
 710         return 1;
 711     rsa->pss = rsa_pss_params_create(rctx->md, rctx->mgf1md,
 712                                      rctx->saltlen == -2 ? 0 : rctx->saltlen);
 713     if (rsa->pss == NULL)
 714         return 0;
 715     return 1;
 716 }
 717
 718 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 719 {
 720     RSA *rsa = NULL;
 721     RSA_PKEY_CTX *rctx = ctx->data;
 722     BN_GENCB *pcb;
 723     int ret;
 724
 725     if (rctx->pub_exp == NULL) {
 726         rctx->pub_exp = BN_new();
 727         if (rctx->pub_exp == NULL || !BN_set_word(rctx->pub_exp, RSA_F4))
 728             return 0;
 729     }
 730     rsa = RSA_new();
 731     if (rsa == NULL)
 732         return 0;
 733     if (ctx->pkey_gencb) {
 734         pcb = BN_GENCB_new();
 735         if (pcb == NULL) {
 736             RSA_free(rsa);
 737             return 0;
 738         }
 739         evp_pkey_set_cb_translate(pcb, ctx);
 740     } else {
 741         pcb = NULL;
 742     }
 743     ret = RSA_generate_multi_prime_key(rsa, rctx->nbits, rctx->primes,
 744                                        rctx->pub_exp, pcb);
 745     BN_GENCB_free(pcb);
 746     if (ret > 0 && !rsa_set_pss_param(rsa, ctx)) {
 747         RSA_free(rsa);
 748         return 0;
 749     }
 750     if (ret > 0)
 751         EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, rsa);
 752     else
 753         RSA_free(rsa);
 754     return ret;
 755 }
 756
 757 const EVP_PKEY_METHOD rsa_pkey_meth = {
 758     EVP_PKEY_RSA,
 759     EVP_PKEY_FLAG_AUTOARGLEN,
 760     pkey_rsa_init,
 761     pkey_rsa_copy,
 762     pkey_rsa_cleanup,
 763
 764     0, 0,
 765
 766     0,
 767     pkey_rsa_keygen,
 768
 769     0,
 770     pkey_rsa_sign,
 771
 772     0,
 773     pkey_rsa_verify,
 774
 775     0,
 776     pkey_rsa_verifyrecover,
 777
 778     0, 0, 0, 0,
 779
 780     0,
 781     pkey_rsa_encrypt,
 782
 783     0,
 784     pkey_rsa_decrypt,
 785
 786     0, 0,
 787
 788     pkey_rsa_ctrl,
 789     pkey_rsa_ctrl_str
 790 };
 791
 792 /*
 793  * Called for PSS sign or verify initialisation: checks PSS parameter
 794  * sanity and sets any restrictions on key usage.
 795  */
 796
 797 static int pkey_pss_init(EVP_PKEY_CTX *ctx)
 798 {
 799     RSA *rsa;
 800     RSA_PKEY_CTX *rctx = ctx->data;
 801     const EVP_MD *md;
 802     const EVP_MD *mgf1md;
 803     int min_saltlen, max_saltlen;
 804
 805     /* Should never happen */
 806     if (!pkey_ctx_is_pss(ctx))
 807         return 0;
 808     rsa = ctx->pkey->pkey.rsa;
 809     /* If no restrictions just return */
 810     if (rsa->pss == NULL)
 811         return 1;
 812     /* Get and check parameters */
 813     if (!rsa_pss_get_param(rsa->pss, &md, &mgf1md, &min_saltlen))
 814         return 0;
 815
 816     /* See if minimum salt length exceeds maximum possible */
 817     max_saltlen = RSA_size(rsa) - EVP_MD_size(md);
 818     if ((RSA_bits(rsa) & 0x7) == 1)
 819         max_saltlen--;
 820     if (min_saltlen > max_saltlen) {
 821         RSAerr(RSA_F_PKEY_PSS_INIT, RSA_R_INVALID_SALT_LENGTH);
 822         return 0;
 823     }
 824
 825     rctx->min_saltlen = min_saltlen;
 826
 827     /*
 828      * Set PSS restrictions as defaults: we can then block any attempt to
 829      * use invalid values in pkey_rsa_ctrl
 830      */
 831
 832     rctx->md = md;
 833     rctx->mgf1md = mgf1md;
 834     rctx->saltlen = min_saltlen;
 835
 836     return 1;
 837 }
 838
 839 const EVP_PKEY_METHOD rsa_pss_pkey_meth = {
 840     EVP_PKEY_RSA_PSS,
 841     EVP_PKEY_FLAG_AUTOARGLEN,
 842     pkey_rsa_init,
 843     pkey_rsa_copy,
 844     pkey_rsa_cleanup,
 845
 846     0, 0,
 847
 848     0,
 849     pkey_rsa_keygen,
 850
 851     pkey_pss_init,
 852     pkey_rsa_sign,
 853
 854     pkey_pss_init,
 855     pkey_rsa_verify,
 856
 857     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 858
 859     pkey_rsa_ctrl,
 860     pkey_rsa_ctrl_str
 861 };