crypto/rsa/rsa_pmeth.c

   1 /*
   2  * Copyright 2006-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/asn1t.h>
  13 #include <openssl/x509.h>
  14 #include <openssl/rsa.h>
  15 #include <openssl/bn.h>
  16 #include <openssl/evp.h>
  17 #include <openssl/x509v3.h>
  18 #include <openssl/cms.h>
  19 #include "internal/evp_int.h"
  20 #include "rsa_locl.h"
  21
  22 /* RSA pkey context structure */
  23
  24 typedef struct {
  25     /* Key gen parameters */
  26     int nbits;
  27     BIGNUM *pub_exp;
  28     int primes;
  29     /* Keygen callback info */
  30     int gentmp[2];
  31     /* RSA padding mode */
  32     int pad_mode;
  33     /* message digest */
  34     const EVP_MD *md;
  35     /* message digest for MGF1 */
  36     const EVP_MD *mgf1md;
  37     /* PSS salt length */
  38     int saltlen;
  39     /* Minimum salt length or -1 if no PSS parameter restriction */
  40     int min_saltlen;
  41     /* Temp buffer */
  42     unsigned char *tbuf;
  43     /* OAEP label */
  44     unsigned char *oaep_label;
  45     size_t oaep_labellen;
  46 } RSA_PKEY_CTX;
  47
  48 /* True if PSS parameters are restricted */
  49 #define rsa_pss_restricted(rctx) (rctx->min_saltlen != -1)
  50
  51 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
  52 {
  53     RSA_PKEY_CTX *rctx = OPENSSL_zalloc(sizeof(*rctx));
  54
  55     if (rctx == NULL)
  56         return 0;
  57     rctx->nbits = 1024;
  58     rctx->primes = RSA_DEFAULT_PRIME_NUM;
  59     if (pkey_ctx_is_pss(ctx))
  60         rctx->pad_mode = RSA_PKCS1_PSS_PADDING;
  61     else
  62         rctx->pad_mode = RSA_PKCS1_PADDING;
  63     /* Maximum for sign, auto for verify */
  64     rctx->saltlen = RSA_PSS_SALTLEN_AUTO;
  65     rctx->min_saltlen = -1;
  66     ctx->data = rctx;
  67     ctx->keygen_info = rctx->gentmp;
  68     ctx->keygen_info_count = 2;
  69
  70     return 1;
  71 }
  72
  73 static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
  74 {
  75     RSA_PKEY_CTX *dctx, *sctx;
  76
  77     if (!pkey_rsa_init(dst))
  78         return 0;
  79     sctx = src->data;
  80     dctx = dst->data;
  81     dctx->nbits = sctx->nbits;
  82     if (sctx->pub_exp) {
  83         dctx->pub_exp = BN_dup(sctx->pub_exp);
  84         if (!dctx->pub_exp)
  85             return 0;
  86     }
  87     dctx->pad_mode = sctx->pad_mode;
  88     dctx->md = sctx->md;
  89     dctx->mgf1md = sctx->mgf1md;
  90     if (sctx->oaep_label) {
  91         OPENSSL_free(dctx->oaep_label);
  92         dctx->oaep_label = OPENSSL_memdup(sctx->oaep_label, sctx->oaep_labellen);
  93         if (!dctx->oaep_label)
  94             return 0;
  95         dctx->oaep_labellen = sctx->oaep_labellen;
  96     }
  97     return 1;
  98 }
  99
 100 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
 101 {
 102     if (ctx->tbuf != NULL)
 103         return 1;
 104     if ((ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey))) == NULL) {
 105         RSAerr(RSA_F_SETUP_TBUF, ERR_R_MALLOC_FAILURE);
 106         return 0;
 107     }
 108     return 1;
 109 }
 110
 111 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
 112 {
 113     RSA_PKEY_CTX *rctx = ctx->data;
 114     if (rctx) {
 115         BN_free(rctx->pub_exp);
 116         OPENSSL_free(rctx->tbuf);
 117         OPENSSL_free(rctx->oaep_label);
 118         OPENSSL_free(rctx);
 119     }
 120 }
 121
 122 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
 123                          size_t *siglen, const unsigned char *tbs,
 124                          size_t tbslen)
 125 {
 126     int ret;
 127     RSA_PKEY_CTX *rctx = ctx->data;
 128     RSA *rsa = ctx->pkey->pkey.rsa;
 129
 130     if (rctx->md) {
 131         if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
 132             RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_INVALID_DIGEST_LENGTH);
 133             return -1;
 134         }
 135
 136         if (EVP_MD_type(rctx->md) == NID_mdc2) {
 137             unsigned int sltmp;
 138             if (rctx->pad_mode != RSA_PKCS1_PADDING)
 139                 return -1;
 140             ret = RSA_sign_ASN1_OCTET_STRING(0,
 141                                              tbs, tbslen, sig, &sltmp, rsa);
 142
 143             if (ret <= 0)
 144                 return ret;
 145             ret = sltmp;
 146         } else if (rctx->pad_mode == RSA_X931_PADDING) {
 147             if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
 148                 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
 149                 return -1;
 150             }
 151             if (!setup_tbuf(rctx, ctx)) {
 152                 RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
 153                 return -1;
 154             }
 155             memcpy(rctx->tbuf, tbs, tbslen);
 156             rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
 157             ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
 158                                       sig, rsa, RSA_X931_PADDING);
 159         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 160             unsigned int sltmp;
 161             ret = RSA_sign(EVP_MD_type(rctx->md),
 162                            tbs, tbslen, sig, &sltmp, rsa);
 163             if (ret <= 0)
 164                 return ret;
 165             ret = sltmp;
 166         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 167             if (!setup_tbuf(rctx, ctx))
 168                 return -1;
 169             if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
 170                                                 rctx->tbuf, tbs,
 171                                                 rctx->md, rctx->mgf1md,
 172                                                 rctx->saltlen))
 173                 return -1;
 174             ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
 175                                       sig, rsa, RSA_NO_PADDING);
 176         } else {
 177             return -1;
 178         }
 179     } else {
 180         ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
 181                                   rctx->pad_mode);
 182     }
 183     if (ret < 0)
 184         return ret;
 185     *siglen = ret;
 186     return 1;
 187 }
 188
 189 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
 190                                   unsigned char *rout, size_t *routlen,
 191                                   const unsigned char *sig, size_t siglen)
 192 {
 193     int ret;
 194     RSA_PKEY_CTX *rctx = ctx->data;
 195
 196     if (rctx->md) {
 197         if (rctx->pad_mode == RSA_X931_PADDING) {
 198             if (!setup_tbuf(rctx, ctx))
 199                 return -1;
 200             ret = RSA_public_decrypt(siglen, sig,
 201                                      rctx->tbuf, ctx->pkey->pkey.rsa,
 202                                      RSA_X931_PADDING);
 203             if (ret < 1)
 204                 return 0;
 205             ret--;
 206             if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
 207                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 208                        RSA_R_ALGORITHM_MISMATCH);
 209                 return 0;
 210             }
 211             if (ret != EVP_MD_size(rctx->md)) {
 212                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 213                        RSA_R_INVALID_DIGEST_LENGTH);
 214                 return 0;
 215             }
 216             if (rout)
 217                 memcpy(rout, rctx->tbuf, ret);
 218         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 219             size_t sltmp;
 220             ret = int_rsa_verify(EVP_MD_type(rctx->md),
 221                                  NULL, 0, rout, &sltmp,
 222                                  sig, siglen, ctx->pkey->pkey.rsa);
 223             if (ret <= 0)
 224                 return 0;
 225             ret = sltmp;
 226         } else {
 227             return -1;
 228         }
 229     } else {
 230         ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
 231                                  rctx->pad_mode);
 232     }
 233     if (ret < 0)
 234         return ret;
 235     *routlen = ret;
 236     return 1;
 237 }
 238
 239 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
 240                            const unsigned char *sig, size_t siglen,
 241                            const unsigned char *tbs, size_t tbslen)
 242 {
 243     RSA_PKEY_CTX *rctx = ctx->data;
 244     RSA *rsa = ctx->pkey->pkey.rsa;
 245     size_t rslen;
 246
 247     if (rctx->md) {
 248         if (rctx->pad_mode == RSA_PKCS1_PADDING)
 249             return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
 250                               sig, siglen, rsa);
 251         if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
 252             RSAerr(RSA_F_PKEY_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH);
 253             return -1;
 254         }
 255         if (rctx->pad_mode == RSA_X931_PADDING) {
 256             if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
 257                 return 0;
 258         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 259             int ret;
 260             if (!setup_tbuf(rctx, ctx))
 261                 return -1;
 262             ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 263                                      rsa, RSA_NO_PADDING);
 264             if (ret <= 0)
 265                 return 0;
 266             ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
 267                                             rctx->md, rctx->mgf1md,
 268                                             rctx->tbuf, rctx->saltlen);
 269             if (ret <= 0)
 270                 return 0;
 271             return 1;
 272         } else {
 273             return -1;
 274         }
 275     } else {
 276         if (!setup_tbuf(rctx, ctx))
 277             return -1;
 278         rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 279                                    rsa, rctx->pad_mode);
 280         if (rslen == 0)
 281             return 0;
 282     }
 283
 284     if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
 285         return 0;
 286
 287     return 1;
 288
 289 }
 290
 291 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
 292                             unsigned char *out, size_t *outlen,
 293                             const unsigned char *in, size_t inlen)
 294 {
 295     int ret;
 296     RSA_PKEY_CTX *rctx = ctx->data;
 297
 298     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 299         int klen = RSA_size(ctx->pkey->pkey.rsa);
 300         if (!setup_tbuf(rctx, ctx))
 301             return -1;
 302         if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
 303                                              in, inlen,
 304                                              rctx->oaep_label,
 305                                              rctx->oaep_labellen,
 306                                              rctx->md, rctx->mgf1md))
 307             return -1;
 308         ret = RSA_public_encrypt(klen, rctx->tbuf, out,
 309                                  ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 310     } else {
 311         ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 312                                  rctx->pad_mode);
 313     }
 314     if (ret < 0)
 315         return ret;
 316     *outlen = ret;
 317     return 1;
 318 }
 319
 320 static int pkey_rsa_decrypt(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
 327     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 328         if (!setup_tbuf(rctx, ctx))
 329             return -1;
 330         ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
 331                                   ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 332         if (ret <= 0)
 333             return ret;
 334         ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf,
 335                                                 ret, ret,
 336                                                 rctx->oaep_label,
 337                                                 rctx->oaep_labellen,
 338                                                 rctx->md, rctx->mgf1md);
 339     } else {
 340         ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 341                                   rctx->pad_mode);
 342     }
 343     if (ret < 0)
 344         return ret;
 345     *outlen = ret;
 346     return 1;
 347 }
 348
 349 static int check_padding_md(const EVP_MD *md, int padding)
 350 {
 351     int mdnid;
 352
 353     if (!md)
 354         return 1;
 355
 356     mdnid = EVP_MD_type(md);
 357
 358     if (padding == RSA_NO_PADDING) {
 359         RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
 360         return 0;
 361     }
 362
 363     if (padding == RSA_X931_PADDING) {
 364         if (RSA_X931_hash_id(mdnid) == -1) {
 365             RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
 366             return 0;
 367         }
 368     } else {
 369         switch(mdnid) {
 370         /* List of all supported RSA digests */
 371         case NID_sha1:
 372         case NID_sha224:
 373         case NID_sha256:
 374         case NID_sha384:
 375         case NID_sha512:
 376         case NID_md5:
 377         case NID_md5_sha1:
 378         case NID_md2:
 379         case NID_md4:
 380         case NID_mdc2:
 381         case NID_ripemd160:
 382         case NID_sha3_224:
 383         case NID_sha3_256:
 384         case NID_sha3_384:
 385         case NID_sha3_512:
 386             return 1;
 387
 388         default:
 389             RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_DIGEST);
 390             return 0;
 391
 392         }
 393     }
 394
 395     return 1;
 396 }
 397
 398 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 399 {
 400     RSA_PKEY_CTX *rctx = ctx->data;
 401
 402     switch (type) {
 403     case EVP_PKEY_CTRL_RSA_PADDING:
 404         if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
 405             if (!check_padding_md(rctx->md, p1))
 406                 return 0;
 407             if (p1 == RSA_PKCS1_PSS_PADDING) {
 408                 if (!(ctx->operation &
 409                       (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
 410                     goto bad_pad;
 411                 if (!rctx->md)
 412                     rctx->md = EVP_sha1();
 413             } else if (pkey_ctx_is_pss(ctx)) {
 414                 goto bad_pad;
 415             }
 416             if (p1 == RSA_PKCS1_OAEP_PADDING) {
 417                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
 418                     goto bad_pad;
 419                 if (!rctx->md)
 420                     rctx->md = EVP_sha1();
 421             }
 422             rctx->pad_mode = p1;
 423             return 1;
 424         }
 425  bad_pad:
 426         RSAerr(RSA_F_PKEY_RSA_CTRL,
 427                RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 428         return -2;
 429
 430     case EVP_PKEY_CTRL_GET_RSA_PADDING:
 431         *(int *)p2 = rctx->pad_mode;
 432         return 1;
 433
 434     case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
 435     case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
 436         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
 437             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 438             return -2;
 439         }
 440         if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN) {
 441             *(int *)p2 = rctx->saltlen;
 442         } else {
 443             if (p1 < RSA_PSS_SALTLEN_MAX)
 444                 return -2;
 445             if (rsa_pss_restricted(rctx)) {
 446                 if (p1 == RSA_PSS_SALTLEN_AUTO
 447                     && ctx->operation == EVP_PKEY_OP_VERIFY) {
 448                     RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 449                     return -2;
 450                 }
 451                 if ((p1 == RSA_PSS_SALTLEN_DIGEST
 452                      && rctx->min_saltlen > EVP_MD_size(rctx->md))
 453                     || (p1 >= 0 && p1 < rctx->min_saltlen)) {
 454                     RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_PSS_SALTLEN_TOO_SMALL);
 455                     return 0;
 456                 }
 457             }
 458             rctx->saltlen = p1;
 459         }
 460         return 1;
 461
 462     case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
 463         if (p1 < RSA_MIN_MODULUS_BITS) {
 464             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
 465             return -2;
 466         }
 467         rctx->nbits = p1;
 468         return 1;
 469
 470     case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
 471         if (p2 == NULL || !BN_is_odd((BIGNUM *)p2) || BN_is_one((BIGNUM *)p2)) {
 472             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_BAD_E_VALUE);
 473             return -2;
 474         }
 475         BN_free(rctx->pub_exp);
 476         rctx->pub_exp = p2;
 477         return 1;
 478
 479     case EVP_PKEY_CTRL_RSA_KEYGEN_PRIMES:
 480         if (p1 < RSA_DEFAULT_PRIME_NUM || p1 > RSA_MAX_PRIME_NUM) {
 481             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_PRIME_NUM_INVALID);
 482             return -2;
 483         }
 484         rctx->primes = p1;
 485         return 1;
 486
 487     case EVP_PKEY_CTRL_RSA_OAEP_MD:
 488     case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
 489         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 490             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 491             return -2;
 492         }
 493         if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
 494             *(const EVP_MD **)p2 = rctx->md;
 495         else
 496             rctx->md = p2;
 497         return 1;
 498
 499     case EVP_PKEY_CTRL_MD:
 500         if (!check_padding_md(p2, rctx->pad_mode))
 501             return 0;
 502         if (rsa_pss_restricted(rctx)) {
 503             if (EVP_MD_type(rctx->md) == EVP_MD_type(p2))
 504                 return 1;
 505             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_DIGEST_NOT_ALLOWED);
 506             return 0;
 507         }
 508         rctx->md = p2;
 509         return 1;
 510
 511     case EVP_PKEY_CTRL_GET_MD:
 512         *(const EVP_MD **)p2 = rctx->md;
 513         return 1;
 514
 515     case EVP_PKEY_CTRL_RSA_MGF1_MD:
 516     case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
 517         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
 518             && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 519             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
 520             return -2;
 521         }
 522         if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
 523             if (rctx->mgf1md)
 524                 *(const EVP_MD **)p2 = rctx->mgf1md;
 525             else
 526                 *(const EVP_MD **)p2 = rctx->md;
 527         } else {
 528             if (rsa_pss_restricted(rctx)) {
 529                 if (EVP_MD_type(rctx->mgf1md) == EVP_MD_type(p2))
 530                     return 1;
 531                 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_MGF1_DIGEST_NOT_ALLOWED);
 532                 return 0;
 533             }
 534             rctx->mgf1md = p2;
 535         }
 536         return 1;
 537
 538     case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
 539         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 540             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 541             return -2;
 542         }
 543         OPENSSL_free(rctx->oaep_label);
 544         if (p2 && p1 > 0) {
 545             rctx->oaep_label = p2;
 546             rctx->oaep_labellen = p1;
 547         } else {
 548             rctx->oaep_label = NULL;
 549             rctx->oaep_labellen = 0;
 550         }
 551         return 1;
 552
 553     case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
 554         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 555             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 556             return -2;
 557         }
 558         *(unsigned char **)p2 = rctx->oaep_label;
 559         return rctx->oaep_labellen;
 560
 561     case EVP_PKEY_CTRL_DIGESTINIT:
 562     case EVP_PKEY_CTRL_PKCS7_SIGN:
 563 #ifndef OPENSSL_NO_CMS
 564     case EVP_PKEY_CTRL_CMS_SIGN:
 565 #endif
 566     return 1;
 567
 568     case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 569     case EVP_PKEY_CTRL_PKCS7_DECRYPT:
 570 #ifndef OPENSSL_NO_CMS
 571     case EVP_PKEY_CTRL_CMS_DECRYPT:
 572     case EVP_PKEY_CTRL_CMS_ENCRYPT:
 573 #endif
 574     if (!pkey_ctx_is_pss(ctx))
 575         return 1;
 576     /* fall through */
 577     case EVP_PKEY_CTRL_PEER_KEY:
 578         RSAerr(RSA_F_PKEY_RSA_CTRL,
 579                RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 580         return -2;
 581
 582     default:
 583         return -2;
 584
 585     }
 586 }
 587
 588 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 589                              const char *type, const char *value)
 590 {
 591     if (value == NULL) {
 592         RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
 593         return 0;
 594     }
 595     if (strcmp(type, "rsa_padding_mode") == 0) {
 596         int pm;
 597
 598         if (strcmp(value, "pkcs1") == 0) {
 599             pm = RSA_PKCS1_PADDING;
 600         } else if (strcmp(value, "sslv23") == 0) {
 601             pm = RSA_SSLV23_PADDING;
 602         } else if (strcmp(value, "none") == 0) {
 603             pm = RSA_NO_PADDING;
 604         } else if (strcmp(value, "oeap") == 0) {
 605             pm = RSA_PKCS1_OAEP_PADDING;
 606         } else if (strcmp(value, "oaep") == 0) {
 607             pm = RSA_PKCS1_OAEP_PADDING;
 608         } else if (strcmp(value, "x931") == 0) {
 609             pm = RSA_X931_PADDING;
 610         } else if (strcmp(value, "pss") == 0) {
 611             pm = RSA_PKCS1_PSS_PADDING;
 612         } else {
 613             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
 614             return -2;
 615         }
 616         return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 617     }
 618
 619     if (strcmp(type, "rsa_pss_saltlen") == 0) {
 620         int saltlen;
 621
 622         if (!strcmp(value, "digest"))
 623             saltlen = RSA_PSS_SALTLEN_DIGEST;
 624         else if (!strcmp(value, "max"))
 625             saltlen = RSA_PSS_SALTLEN_MAX;
 626         else if (!strcmp(value, "auto"))
 627             saltlen = RSA_PSS_SALTLEN_AUTO;
 628         else
 629             saltlen = atoi(value);
 630         return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 631     }
 632
 633     if (strcmp(type, "rsa_keygen_bits") == 0) {
 634         int nbits = atoi(value);
 635
 636         return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
 637     }
 638
 639     if (strcmp(type, "rsa_keygen_pubexp") == 0) {
 640         int ret;
 641
 642         BIGNUM *pubexp = NULL;
 643         if (!BN_asc2bn(&pubexp, value))
 644             return 0;
 645         ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
 646         if (ret <= 0)
 647             BN_free(pubexp);
 648         return ret;
 649     }
 650
 651     if (strcmp(type, "rsa_keygen_primes") == 0) {
 652         int nprimes = atoi(value);
 653
 654         return EVP_PKEY_CTX_set_rsa_keygen_primes(ctx, nprimes);
 655     }
 656
 657     if (strcmp(type, "rsa_mgf1_md") == 0)
 658         return EVP_PKEY_CTX_md(ctx,
 659                                EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
 660                                EVP_PKEY_CTRL_RSA_MGF1_MD, value);
 661
 662     if (pkey_ctx_is_pss(ctx)) {
 663
 664         if (strcmp(type, "rsa_pss_keygen_mgf1_md") == 0)
 665             return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
 666                                    EVP_PKEY_CTRL_RSA_MGF1_MD, value);
 667
 668         if (strcmp(type, "rsa_pss_keygen_md") == 0)
 669             return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
 670                                    EVP_PKEY_CTRL_MD, value);
 671
 672         if (strcmp(type, "rsa_pss_keygen_saltlen") == 0) {
 673             int saltlen = atoi(value);
 674
 675             return EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(ctx, saltlen);
 676         }
 677     }
 678
 679     if (strcmp(type, "rsa_oaep_md") == 0)
 680         return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_TYPE_CRYPT,
 681                                EVP_PKEY_CTRL_RSA_OAEP_MD, value);
 682
 683     if (strcmp(type, "rsa_oaep_label") == 0) {
 684         unsigned char *lab;
 685         long lablen;
 686         int ret;
 687
 688         lab = OPENSSL_hexstr2buf(value, &lablen);
 689         if (!lab)
 690             return 0;
 691         ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
 692         if (ret <= 0)
 693             OPENSSL_free(lab);
 694         return ret;
 695     }
 696
 697     return -2;
 698 }
 699
 700 /* Set PSS parameters when generating a key, if necessary */
 701 static int rsa_set_pss_param(RSA *rsa, EVP_PKEY_CTX *ctx)
 702 {
 703     RSA_PKEY_CTX *rctx = ctx->data;
 704
 705     if (!pkey_ctx_is_pss(ctx))
 706         return 1;
 707     /* If all parameters are default values don't set pss */
 708     if (rctx->md == NULL && rctx->mgf1md == NULL && rctx->saltlen == -2)
 709         return 1;
 710     rsa->pss = rsa_pss_params_create(rctx->md, rctx->mgf1md,
 711                                      rctx->saltlen == -2 ? 0 : rctx->saltlen);
 712     if (rsa->pss == NULL)
 713         return 0;
 714     return 1;
 715 }
 716
 717 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 718 {
 719     RSA *rsa = NULL;
 720     RSA_PKEY_CTX *rctx = ctx->data;
 721     BN_GENCB *pcb;
 722     int ret;
 723
 724     if (rctx->pub_exp == NULL) {
 725         rctx->pub_exp = BN_new();
 726         if (rctx->pub_exp == NULL || !BN_set_word(rctx->pub_exp, RSA_F4))
 727             return 0;
 728     }
 729     rsa = RSA_new();
 730     if (rsa == NULL)
 731         return 0;
 732     if (ctx->pkey_gencb) {
 733         pcb = BN_GENCB_new();
 734         if (pcb == NULL) {
 735             RSA_free(rsa);
 736             return 0;
 737         }
 738         evp_pkey_set_cb_translate(pcb, ctx);
 739     } else {
 740         pcb = NULL;
 741     }
 742     ret = RSA_generate_multi_prime_key(rsa, rctx->nbits, rctx->primes,
 743                                        rctx->pub_exp, pcb);
 744     BN_GENCB_free(pcb);
 745     if (ret > 0 && !rsa_set_pss_param(rsa, ctx)) {
 746         RSA_free(rsa);
 747         return 0;
 748     }
 749     if (ret > 0)
 750         EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, rsa);
 751     else
 752         RSA_free(rsa);
 753     return ret;
 754 }
 755
 756 const EVP_PKEY_METHOD rsa_pkey_meth = {
 757     EVP_PKEY_RSA,
 758     EVP_PKEY_FLAG_AUTOARGLEN,
 759     pkey_rsa_init,
 760     pkey_rsa_copy,
 761     pkey_rsa_cleanup,
 762
 763     0, 0,
 764
 765     0,
 766     pkey_rsa_keygen,
 767
 768     0,
 769     pkey_rsa_sign,
 770
 771     0,
 772     pkey_rsa_verify,
 773
 774     0,
 775     pkey_rsa_verifyrecover,
 776
 777     0, 0, 0, 0,
 778
 779     0,
 780     pkey_rsa_encrypt,
 781
 782     0,
 783     pkey_rsa_decrypt,
 784
 785     0, 0,
 786
 787     pkey_rsa_ctrl,
 788     pkey_rsa_ctrl_str
 789 };
 790
 791 /*
 792  * Called for PSS sign or verify initialisation: checks PSS parameter
 793  * sanity and sets any restrictions on key usage.
 794  */
 795
 796 static int pkey_pss_init(EVP_PKEY_CTX *ctx)
 797 {
 798     RSA *rsa;
 799     RSA_PKEY_CTX *rctx = ctx->data;
 800     const EVP_MD *md;
 801     const EVP_MD *mgf1md;
 802     int min_saltlen, max_saltlen;
 803
 804     /* Should never happen */
 805     if (!pkey_ctx_is_pss(ctx))
 806         return 0;
 807     rsa = ctx->pkey->pkey.rsa;
 808     /* If no restrictions just return */
 809     if (rsa->pss == NULL)
 810         return 1;
 811     /* Get and check parameters */
 812     if (!rsa_pss_get_param(rsa->pss, &md, &mgf1md, &min_saltlen))
 813         return 0;
 814
 815     /* See if minimum salt length exceeds maximum possible */
 816     max_saltlen = RSA_size(rsa) - EVP_MD_size(md);
 817     if ((RSA_bits(rsa) & 0x7) == 1)
 818         max_saltlen--;
 819     if (min_saltlen > max_saltlen) {
 820         RSAerr(RSA_F_PKEY_PSS_INIT, RSA_R_INVALID_SALT_LENGTH);
 821         return 0;
 822     }
 823
 824     rctx->min_saltlen = min_saltlen;
 825
 826     /*
 827      * Set PSS restrictions as defaults: we can then block any attempt to
 828      * use invalid values in pkey_rsa_ctrl
 829      */
 830
 831     rctx->md = md;
 832     rctx->mgf1md = mgf1md;
 833     rctx->saltlen = min_saltlen;
 834
 835     return 1;
 836 }
 837
 838 const EVP_PKEY_METHOD rsa_pss_pkey_meth = {
 839     EVP_PKEY_RSA_PSS,
 840     EVP_PKEY_FLAG_AUTOARGLEN,
 841     pkey_rsa_init,
 842     pkey_rsa_copy,
 843     pkey_rsa_cleanup,
 844
 845     0, 0,
 846
 847     0,
 848     pkey_rsa_keygen,
 849
 850     pkey_pss_init,
 851     pkey_rsa_sign,
 852
 853     pkey_pss_init,
 854     pkey_rsa_verify,
 855
 856     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 857
 858     pkey_rsa_ctrl,
 859     pkey_rsa_ctrl_str
 860 };