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.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 "crypto/evp.h"
  22 #include "rsa_local.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 = 2048;
  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     dctx->saltlen = sctx->saltlen;
  93     if (sctx->oaep_label) {
  94         OPENSSL_free(dctx->oaep_label);
  95         dctx->oaep_label = OPENSSL_memdup(sctx->oaep_label, sctx->oaep_labellen);
  96         if (!dctx->oaep_label)
  97             return 0;
  98         dctx->oaep_labellen = sctx->oaep_labellen;
  99     }
 100     return 1;
 101 }
 102
 103 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
 104 {
 105     if (ctx->tbuf != NULL)
 106         return 1;
 107     if ((ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey))) == NULL) {
 108         RSAerr(RSA_F_SETUP_TBUF, ERR_R_MALLOC_FAILURE);
 109         return 0;
 110     }
 111     return 1;
 112 }
 113
 114 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
 115 {
 116     RSA_PKEY_CTX *rctx = ctx->data;
 117     if (rctx) {
 118         BN_free(rctx->pub_exp);
 119         OPENSSL_free(rctx->tbuf);
 120         OPENSSL_free(rctx->oaep_label);
 121         OPENSSL_free(rctx);
 122     }
 123 }
 124
 125 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
 126                          size_t *siglen, const unsigned char *tbs,
 127                          size_t tbslen)
 128 {
 129     int ret;
 130     RSA_PKEY_CTX *rctx = ctx->data;
 131     RSA *rsa = ctx->pkey->pkey.rsa;
 132
 133     if (rctx->md) {
 134         if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
 135             RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_INVALID_DIGEST_LENGTH);
 136             return -1;
 137         }
 138
 139         if (EVP_MD_type(rctx->md) == NID_mdc2) {
 140             unsigned int sltmp;
 141             if (rctx->pad_mode != RSA_PKCS1_PADDING)
 142                 return -1;
 143             ret = RSA_sign_ASN1_OCTET_STRING(0,
 144                                              tbs, tbslen, sig, &sltmp, rsa);
 145
 146             if (ret <= 0)
 147                 return ret;
 148             ret = sltmp;
 149         } else if (rctx->pad_mode == RSA_X931_PADDING) {
 150             if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
 151                 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
 152                 return -1;
 153             }
 154             if (!setup_tbuf(rctx, ctx)) {
 155                 RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
 156                 return -1;
 157             }
 158             memcpy(rctx->tbuf, tbs, tbslen);
 159             rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
 160             ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
 161                                       sig, rsa, RSA_X931_PADDING);
 162         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 163             unsigned int sltmp;
 164             ret = RSA_sign(EVP_MD_type(rctx->md),
 165                            tbs, tbslen, sig, &sltmp, rsa);
 166             if (ret <= 0)
 167                 return ret;
 168             ret = sltmp;
 169         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 170             if (!setup_tbuf(rctx, ctx))
 171                 return -1;
 172             if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
 173                                                 rctx->tbuf, tbs,
 174                                                 rctx->md, rctx->mgf1md,
 175                                                 rctx->saltlen))
 176                 return -1;
 177             ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
 178                                       sig, rsa, RSA_NO_PADDING);
 179         } else {
 180             return -1;
 181         }
 182     } else {
 183         ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
 184                                   rctx->pad_mode);
 185     }
 186     if (ret < 0)
 187         return ret;
 188     *siglen = ret;
 189     return 1;
 190 }
 191
 192 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
 193                                   unsigned char *rout, size_t *routlen,
 194                                   const unsigned char *sig, size_t siglen)
 195 {
 196     int ret;
 197     RSA_PKEY_CTX *rctx = ctx->data;
 198
 199     if (rctx->md) {
 200         if (rctx->pad_mode == RSA_X931_PADDING) {
 201             if (!setup_tbuf(rctx, ctx))
 202                 return -1;
 203             ret = RSA_public_decrypt(siglen, sig,
 204                                      rctx->tbuf, ctx->pkey->pkey.rsa,
 205                                      RSA_X931_PADDING);
 206             if (ret < 1)
 207                 return 0;
 208             ret--;
 209             if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
 210                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 211                        RSA_R_ALGORITHM_MISMATCH);
 212                 return 0;
 213             }
 214             if (ret != EVP_MD_size(rctx->md)) {
 215                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 216                        RSA_R_INVALID_DIGEST_LENGTH);
 217                 return 0;
 218             }
 219             if (rout)
 220                 memcpy(rout, rctx->tbuf, ret);
 221         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 222             size_t sltmp;
 223             ret = int_rsa_verify(EVP_MD_type(rctx->md),
 224                                  NULL, 0, rout, &sltmp,
 225                                  sig, siglen, ctx->pkey->pkey.rsa);
 226             if (ret <= 0)
 227                 return 0;
 228             ret = sltmp;
 229         } else {
 230             return -1;
 231         }
 232     } else {
 233         ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
 234                                  rctx->pad_mode);
 235     }
 236     if (ret < 0)
 237         return ret;
 238     *routlen = ret;
 239     return 1;
 240 }
 241
 242 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
 243                            const unsigned char *sig, size_t siglen,
 244                            const unsigned char *tbs, size_t tbslen)
 245 {
 246     RSA_PKEY_CTX *rctx = ctx->data;
 247     RSA *rsa = ctx->pkey->pkey.rsa;
 248     size_t rslen;
 249
 250     if (rctx->md) {
 251         if (rctx->pad_mode == RSA_PKCS1_PADDING)
 252             return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
 253                               sig, siglen, rsa);
 254         if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
 255             RSAerr(RSA_F_PKEY_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH);
 256             return -1;
 257         }
 258         if (rctx->pad_mode == RSA_X931_PADDING) {
 259             if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
 260                 return 0;
 261         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 262             int ret;
 263             if (!setup_tbuf(rctx, ctx))
 264                 return -1;
 265             ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 266                                      rsa, RSA_NO_PADDING);
 267             if (ret <= 0)
 268                 return 0;
 269             ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
 270                                             rctx->md, rctx->mgf1md,
 271                                             rctx->tbuf, rctx->saltlen);
 272             if (ret <= 0)
 273                 return 0;
 274             return 1;
 275         } else {
 276             return -1;
 277         }
 278     } else {
 279         if (!setup_tbuf(rctx, ctx))
 280             return -1;
 281         rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 282                                    rsa, rctx->pad_mode);
 283         if (rslen == 0)
 284             return 0;
 285     }
 286
 287     if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
 288         return 0;
 289
 290     return 1;
 291
 292 }
 293
 294 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
 295                             unsigned char *out, size_t *outlen,
 296                             const unsigned char *in, size_t inlen)
 297 {
 298     int ret;
 299     RSA_PKEY_CTX *rctx = ctx->data;
 300
 301     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 302         int klen = RSA_size(ctx->pkey->pkey.rsa);
 303         if (!setup_tbuf(rctx, ctx))
 304             return -1;
 305         if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
 306                                              in, inlen,
 307                                              rctx->oaep_label,
 308                                              rctx->oaep_labellen,
 309                                              rctx->md, rctx->mgf1md))
 310             return -1;
 311         ret = RSA_public_encrypt(klen, rctx->tbuf, out,
 312                                  ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 313     } else {
 314         ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 315                                  rctx->pad_mode);
 316     }
 317     if (ret < 0)
 318         return ret;
 319     *outlen = ret;
 320     return 1;
 321 }
 322
 323 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
 324                             unsigned char *out, size_t *outlen,
 325                             const unsigned char *in, size_t inlen)
 326 {
 327     int ret;
 328     RSA_PKEY_CTX *rctx = ctx->data;
 329
 330     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 331         if (!setup_tbuf(rctx, ctx))
 332             return -1;
 333         ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
 334                                   ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 335         if (ret <= 0)
 336             return ret;
 337         ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf,
 338                                                 ret, ret,
 339                                                 rctx->oaep_label,
 340                                                 rctx->oaep_labellen,
 341                                                 rctx->md, rctx->mgf1md);
 342     } else {
 343         ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 344                                   rctx->pad_mode);
 345     }
 346     *outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
 347     ret = constant_time_select_int(constant_time_msb(ret), ret, 1);
 348     return ret;
 349 }
 350
 351 static int check_padding_md(const EVP_MD *md, int padding)
 352 {
 353     int mdnid;
 354
 355     if (!md)
 356         return 1;
 357
 358     mdnid = EVP_MD_type(md);
 359
 360     if (padding == RSA_NO_PADDING) {
 361         RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
 362         return 0;
 363     }
 364
 365     if (padding == RSA_X931_PADDING) {
 366         if (RSA_X931_hash_id(mdnid) == -1) {
 367             RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
 368             return 0;
 369         }
 370     } else {
 371         switch(mdnid) {
 372         /* List of all supported RSA digests */
 373         case NID_sha1:
 374         case NID_sha224:
 375         case NID_sha256:
 376         case NID_sha384:
 377         case NID_sha512:
 378         case NID_md5:
 379         case NID_md5_sha1:
 380         case NID_md2:
 381         case NID_md4:
 382         case NID_mdc2:
 383         case NID_ripemd160:
 384         case NID_sha3_224:
 385         case NID_sha3_256:
 386         case NID_sha3_384:
 387         case NID_sha3_512:
 388             return 1;
 389
 390         default:
 391             RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_DIGEST);
 392             return 0;
 393
 394         }
 395     }
 396
 397     return 1;
 398 }
 399
 400 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 401 {
 402     RSA_PKEY_CTX *rctx = ctx->data;
 403
 404     switch (type) {
 405     case EVP_PKEY_CTRL_RSA_PADDING:
 406         if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
 407             if (!check_padding_md(rctx->md, p1))
 408                 return 0;
 409             if (p1 == RSA_PKCS1_PSS_PADDING) {
 410                 if (!(ctx->operation &
 411                       (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
 412                     goto bad_pad;
 413                 if (!rctx->md)
 414                     rctx->md = EVP_sha1();
 415             } else if (pkey_ctx_is_pss(ctx)) {
 416                 goto bad_pad;
 417             }
 418             if (p1 == RSA_PKCS1_OAEP_PADDING) {
 419                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
 420                     goto bad_pad;
 421                 if (!rctx->md)
 422                     rctx->md = EVP_sha1();
 423             }
 424             rctx->pad_mode = p1;
 425             return 1;
 426         }
 427  bad_pad:
 428         RSAerr(RSA_F_PKEY_RSA_CTRL,
 429                RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 430         return -2;
 431
 432     case EVP_PKEY_CTRL_GET_RSA_PADDING:
 433         *(int *)p2 = rctx->pad_mode;
 434         return 1;
 435
 436     case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
 437     case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
 438         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
 439             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 440             return -2;
 441         }
 442         if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN) {
 443             *(int *)p2 = rctx->saltlen;
 444         } else {
 445             if (p1 < RSA_PSS_SALTLEN_MAX)
 446                 return -2;
 447             if (rsa_pss_restricted(rctx)) {
 448                 if (p1 == RSA_PSS_SALTLEN_AUTO
 449                     && ctx->operation == EVP_PKEY_OP_VERIFY) {
 450                     RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 451                     return -2;
 452                 }
 453                 if ((p1 == RSA_PSS_SALTLEN_DIGEST
 454                      && rctx->min_saltlen > EVP_MD_size(rctx->md))
 455                     || (p1 >= 0 && p1 < rctx->min_saltlen)) {
 456                     RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_PSS_SALTLEN_TOO_SMALL);
 457                     return 0;
 458                 }
 459             }
 460             rctx->saltlen = p1;
 461         }
 462         return 1;
 463
 464     case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
 465         if (p1 < RSA_MIN_MODULUS_BITS) {
 466             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
 467             return -2;
 468         }
 469         rctx->nbits = p1;
 470         return 1;
 471
 472     case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
 473         if (p2 == NULL || !BN_is_odd((BIGNUM *)p2) || BN_is_one((BIGNUM *)p2)) {
 474             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_BAD_E_VALUE);
 475             return -2;
 476         }
 477         BN_free(rctx->pub_exp);
 478         rctx->pub_exp = p2;
 479         return 1;
 480
 481     case EVP_PKEY_CTRL_RSA_KEYGEN_PRIMES:
 482         if (p1 < RSA_DEFAULT_PRIME_NUM || p1 > RSA_MAX_PRIME_NUM) {
 483             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_PRIME_NUM_INVALID);
 484             return -2;
 485         }
 486         rctx->primes = p1;
 487         return 1;
 488
 489     case EVP_PKEY_CTRL_RSA_OAEP_MD:
 490     case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
 491         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 492             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 493             return -2;
 494         }
 495         if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
 496             *(const EVP_MD **)p2 = rctx->md;
 497         else
 498             rctx->md = p2;
 499         return 1;
 500
 501     case EVP_PKEY_CTRL_MD:
 502         if (!check_padding_md(p2, rctx->pad_mode))
 503             return 0;
 504         if (rsa_pss_restricted(rctx)) {
 505             if (EVP_MD_type(rctx->md) == EVP_MD_type(p2))
 506                 return 1;
 507             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_DIGEST_NOT_ALLOWED);
 508             return 0;
 509         }
 510         rctx->md = p2;
 511         return 1;
 512
 513     case EVP_PKEY_CTRL_GET_MD:
 514         *(const EVP_MD **)p2 = rctx->md;
 515         return 1;
 516
 517     case EVP_PKEY_CTRL_RSA_MGF1_MD:
 518     case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
 519         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
 520             && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 521             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
 522             return -2;
 523         }
 524         if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
 525             if (rctx->mgf1md)
 526                 *(const EVP_MD **)p2 = rctx->mgf1md;
 527             else
 528                 *(const EVP_MD **)p2 = rctx->md;
 529         } else {
 530             if (rsa_pss_restricted(rctx)) {
 531                 if (EVP_MD_type(rctx->mgf1md) == EVP_MD_type(p2))
 532                     return 1;
 533                 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_MGF1_DIGEST_NOT_ALLOWED);
 534                 return 0;
 535             }
 536             rctx->mgf1md = p2;
 537         }
 538         return 1;
 539
 540     case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
 541         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 542             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 543             return -2;
 544         }
 545         OPENSSL_free(rctx->oaep_label);
 546         if (p2 && p1 > 0) {
 547             rctx->oaep_label = p2;
 548             rctx->oaep_labellen = p1;
 549         } else {
 550             rctx->oaep_label = NULL;
 551             rctx->oaep_labellen = 0;
 552         }
 553         return 1;
 554
 555     case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
 556         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 557             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 558             return -2;
 559         }
 560         *(unsigned char **)p2 = rctx->oaep_label;
 561         return rctx->oaep_labellen;
 562
 563     case EVP_PKEY_CTRL_DIGESTINIT:
 564     case EVP_PKEY_CTRL_PKCS7_SIGN:
 565 #ifndef OPENSSL_NO_CMS
 566     case EVP_PKEY_CTRL_CMS_SIGN:
 567 #endif
 568     return 1;
 569
 570     case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 571     case EVP_PKEY_CTRL_PKCS7_DECRYPT:
 572 #ifndef OPENSSL_NO_CMS
 573     case EVP_PKEY_CTRL_CMS_DECRYPT:
 574     case EVP_PKEY_CTRL_CMS_ENCRYPT:
 575 #endif
 576     if (!pkey_ctx_is_pss(ctx))
 577         return 1;
 578     /* fall through */
 579     case EVP_PKEY_CTRL_PEER_KEY:
 580         RSAerr(RSA_F_PKEY_RSA_CTRL,
 581                RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 582         return -2;
 583
 584     default:
 585         return -2;
 586
 587     }
 588 }
 589
 590 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 591                              const char *type, const char *value)
 592 {
 593     if (value == NULL) {
 594         RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
 595         return 0;
 596     }
 597     if (strcmp(type, "rsa_padding_mode") == 0) {
 598         int pm;
 599
 600         if (strcmp(value, "pkcs1") == 0) {
 601             pm = RSA_PKCS1_PADDING;
 602         } else if (strcmp(value, "sslv23") == 0) {
 603             pm = RSA_SSLV23_PADDING;
 604         } else if (strcmp(value, "none") == 0) {
 605             pm = RSA_NO_PADDING;
 606         } else if (strcmp(value, "oeap") == 0) {
 607             pm = RSA_PKCS1_OAEP_PADDING;
 608         } else if (strcmp(value, "oaep") == 0) {
 609             pm = RSA_PKCS1_OAEP_PADDING;
 610         } else if (strcmp(value, "x931") == 0) {
 611             pm = RSA_X931_PADDING;
 612         } else if (strcmp(value, "pss") == 0) {
 613             pm = RSA_PKCS1_PSS_PADDING;
 614         } else {
 615             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
 616             return -2;
 617         }
 618         return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 619     }
 620
 621     if (strcmp(type, "rsa_pss_saltlen") == 0) {
 622         int saltlen;
 623
 624         if (!strcmp(value, "digest"))
 625             saltlen = RSA_PSS_SALTLEN_DIGEST;
 626         else if (!strcmp(value, "max"))
 627             saltlen = RSA_PSS_SALTLEN_MAX;
 628         else if (!strcmp(value, "auto"))
 629             saltlen = RSA_PSS_SALTLEN_AUTO;
 630         else
 631             saltlen = atoi(value);
 632         return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 633     }
 634
 635     if (strcmp(type, "rsa_keygen_bits") == 0) {
 636         int nbits = atoi(value);
 637
 638         return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
 639     }
 640
 641     if (strcmp(type, "rsa_keygen_pubexp") == 0) {
 642         int ret;
 643
 644         BIGNUM *pubexp = NULL;
 645         if (!BN_asc2bn(&pubexp, value))
 646             return 0;
 647         ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
 648         if (ret <= 0)
 649             BN_free(pubexp);
 650         return ret;
 651     }
 652
 653     if (strcmp(type, "rsa_keygen_primes") == 0) {
 654         int nprimes = atoi(value);
 655
 656         return EVP_PKEY_CTX_set_rsa_keygen_primes(ctx, nprimes);
 657     }
 658
 659     if (strcmp(type, "rsa_mgf1_md") == 0)
 660         return EVP_PKEY_CTX_md(ctx,
 661                                EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
 662                                EVP_PKEY_CTRL_RSA_MGF1_MD, value);
 663
 664     if (pkey_ctx_is_pss(ctx)) {
 665
 666         if (strcmp(type, "rsa_pss_keygen_mgf1_md") == 0)
 667             return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
 668                                    EVP_PKEY_CTRL_RSA_MGF1_MD, value);
 669
 670         if (strcmp(type, "rsa_pss_keygen_md") == 0)
 671             return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
 672                                    EVP_PKEY_CTRL_MD, value);
 673
 674         if (strcmp(type, "rsa_pss_keygen_saltlen") == 0) {
 675             int saltlen = atoi(value);
 676
 677             return EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(ctx, saltlen);
 678         }
 679     }
 680
 681     if (strcmp(type, "rsa_oaep_md") == 0)
 682         return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_TYPE_CRYPT,
 683                                EVP_PKEY_CTRL_RSA_OAEP_MD, value);
 684
 685     if (strcmp(type, "rsa_oaep_label") == 0) {
 686         unsigned char *lab;
 687         long lablen;
 688         int ret;
 689
 690         lab = OPENSSL_hexstr2buf(value, &lablen);
 691         if (!lab)
 692             return 0;
 693         ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
 694         if (ret <= 0)
 695             OPENSSL_free(lab);
 696         return ret;
 697     }
 698
 699     return -2;
 700 }
 701
 702 /* Set PSS parameters when generating a key, if necessary */
 703 static int rsa_set_pss_param(RSA *rsa, EVP_PKEY_CTX *ctx)
 704 {
 705     RSA_PKEY_CTX *rctx = ctx->data;
 706
 707     if (!pkey_ctx_is_pss(ctx))
 708         return 1;
 709     /* If all parameters are default values don't set pss */
 710     if (rctx->md == NULL && rctx->mgf1md == NULL && rctx->saltlen == -2)
 711         return 1;
 712     rsa->pss = rsa_pss_params_create(rctx->md, rctx->mgf1md,
 713                                      rctx->saltlen == -2 ? 0 : rctx->saltlen);
 714     if (rsa->pss == NULL)
 715         return 0;
 716     return 1;
 717 }
 718
 719 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 720 {
 721     RSA *rsa = NULL;
 722     RSA_PKEY_CTX *rctx = ctx->data;
 723     BN_GENCB *pcb;
 724     int ret;
 725
 726     if (rctx->pub_exp == NULL) {
 727         rctx->pub_exp = BN_new();
 728         if (rctx->pub_exp == NULL || !BN_set_word(rctx->pub_exp, RSA_F4))
 729             return 0;
 730     }
 731     rsa = RSA_new();
 732     if (rsa == NULL)
 733         return 0;
 734     if (ctx->pkey_gencb) {
 735         pcb = BN_GENCB_new();
 736         if (pcb == NULL) {
 737             RSA_free(rsa);
 738             return 0;
 739         }
 740         evp_pkey_set_cb_translate(pcb, ctx);
 741     } else {
 742         pcb = NULL;
 743     }
 744     ret = RSA_generate_multi_prime_key(rsa, rctx->nbits, rctx->primes,
 745                                        rctx->pub_exp, pcb);
 746     BN_GENCB_free(pcb);
 747     if (ret > 0 && !rsa_set_pss_param(rsa, ctx)) {
 748         RSA_free(rsa);
 749         return 0;
 750     }
 751     if (ret > 0)
 752         EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, rsa);
 753     else
 754         RSA_free(rsa);
 755     return ret;
 756 }
 757
 758 static const EVP_PKEY_METHOD rsa_pkey_meth = {
 759     EVP_PKEY_RSA,
 760     EVP_PKEY_FLAG_AUTOARGLEN,
 761     pkey_rsa_init,
 762     pkey_rsa_copy,
 763     pkey_rsa_cleanup,
 764
 765     0, 0,
 766
 767     0,
 768     pkey_rsa_keygen,
 769
 770     0,
 771     pkey_rsa_sign,
 772
 773     0,
 774     pkey_rsa_verify,
 775
 776     0,
 777     pkey_rsa_verifyrecover,
 778
 779     0, 0, 0, 0,
 780
 781     0,
 782     pkey_rsa_encrypt,
 783
 784     0,
 785     pkey_rsa_decrypt,
 786
 787     0, 0,
 788
 789     pkey_rsa_ctrl,
 790     pkey_rsa_ctrl_str
 791 };
 792
 793 const EVP_PKEY_METHOD *rsa_pkey_method(void)
 794 {
 795     return &rsa_pkey_meth;
 796 }
 797
 798 /*
 799  * Called for PSS sign or verify initialisation: checks PSS parameter
 800  * sanity and sets any restrictions on key usage.
 801  */
 802
 803 static int pkey_pss_init(EVP_PKEY_CTX *ctx)
 804 {
 805     RSA *rsa;
 806     RSA_PKEY_CTX *rctx = ctx->data;
 807     const EVP_MD *md;
 808     const EVP_MD *mgf1md;
 809     int min_saltlen, max_saltlen;
 810
 811     /* Should never happen */
 812     if (!pkey_ctx_is_pss(ctx))
 813         return 0;
 814     rsa = ctx->pkey->pkey.rsa;
 815     /* If no restrictions just return */
 816     if (rsa->pss == NULL)
 817         return 1;
 818     /* Get and check parameters */
 819     if (!rsa_pss_get_param(rsa->pss, &md, &mgf1md, &min_saltlen))
 820         return 0;
 821
 822     /* See if minimum salt length exceeds maximum possible */
 823     max_saltlen = RSA_size(rsa) - EVP_MD_size(md);
 824     if ((RSA_bits(rsa) & 0x7) == 1)
 825         max_saltlen--;
 826     if (min_saltlen > max_saltlen) {
 827         RSAerr(RSA_F_PKEY_PSS_INIT, RSA_R_INVALID_SALT_LENGTH);
 828         return 0;
 829     }
 830
 831     rctx->min_saltlen = min_saltlen;
 832
 833     /*
 834      * Set PSS restrictions as defaults: we can then block any attempt to
 835      * use invalid values in pkey_rsa_ctrl
 836      */
 837
 838     rctx->md = md;
 839     rctx->mgf1md = mgf1md;
 840     rctx->saltlen = min_saltlen;
 841
 842     return 1;
 843 }
 844
 845 static const EVP_PKEY_METHOD rsa_pss_pkey_meth = {
 846     EVP_PKEY_RSA_PSS,
 847     EVP_PKEY_FLAG_AUTOARGLEN,
 848     pkey_rsa_init,
 849     pkey_rsa_copy,
 850     pkey_rsa_cleanup,
 851
 852     0, 0,
 853
 854     0,
 855     pkey_rsa_keygen,
 856
 857     pkey_pss_init,
 858     pkey_rsa_sign,
 859
 860     pkey_pss_init,
 861     pkey_rsa_verify,
 862
 863     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 864
 865     pkey_rsa_ctrl,
 866     pkey_rsa_ctrl_str
 867 };
 868
 869 const EVP_PKEY_METHOD *rsa_pss_pkey_method(void)
 870 {
 871     return &rsa_pss_pkey_meth;
 872 }