crypto/rsa/rsa_pmeth.c

   1 /*
   2  * Copyright 2006-2020 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 /*
  11  * RSA low level APIs are deprecated for public use, but still ok for
  12  * internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include "internal/constant_time.h"
  17
  18 #include <stdio.h>
  19 #include "internal/cryptlib.h"
  20 #include <openssl/asn1t.h>
  21 #include <openssl/x509.h>
  22 #include <openssl/rsa.h>
  23 #include <openssl/bn.h>
  24 #include <openssl/evp.h>
  25 #include <openssl/x509v3.h>
  26 #include <openssl/cms.h>
  27 #include "crypto/evp.h"
  28 #include "crypto/rsa.h"
  29 #include "rsa_local.h"
  30
  31 /* RSA pkey context structure */
  32
  33 typedef struct {
  34     /* Key gen parameters */
  35     int nbits;
  36     BIGNUM *pub_exp;
  37     int primes;
  38     /* Keygen callback info */
  39     int gentmp[2];
  40     /* RSA padding mode */
  41     int pad_mode;
  42     /* message digest */
  43     const EVP_MD *md;
  44     /* message digest for MGF1 */
  45     const EVP_MD *mgf1md;
  46     /* PSS salt length */
  47     int saltlen;
  48     /* Minimum salt length or -1 if no PSS parameter restriction */
  49     int min_saltlen;
  50     /* Temp buffer */
  51     unsigned char *tbuf;
  52     /* OAEP label */
  53     unsigned char *oaep_label;
  54     size_t oaep_labellen;
  55 } RSA_PKEY_CTX;
  56
  57 /* True if PSS parameters are restricted */
  58 #define rsa_pss_restricted(rctx) (rctx->min_saltlen != -1)
  59
  60 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
  61 {
  62     RSA_PKEY_CTX *rctx = OPENSSL_zalloc(sizeof(*rctx));
  63
  64     if (rctx == NULL)
  65         return 0;
  66     rctx->nbits = 2048;
  67     rctx->primes = RSA_DEFAULT_PRIME_NUM;
  68     if (pkey_ctx_is_pss(ctx))
  69         rctx->pad_mode = RSA_PKCS1_PSS_PADDING;
  70     else
  71         rctx->pad_mode = RSA_PKCS1_PADDING;
  72     /* Maximum for sign, auto for verify */
  73     rctx->saltlen = RSA_PSS_SALTLEN_AUTO;
  74     rctx->min_saltlen = -1;
  75     ctx->data = rctx;
  76     ctx->keygen_info = rctx->gentmp;
  77     ctx->keygen_info_count = 2;
  78
  79     return 1;
  80 }
  81
  82 static int pkey_rsa_copy(EVP_PKEY_CTX *dst, const EVP_PKEY_CTX *src)
  83 {
  84     RSA_PKEY_CTX *dctx, *sctx;
  85
  86     if (!pkey_rsa_init(dst))
  87         return 0;
  88     sctx = src->data;
  89     dctx = dst->data;
  90     dctx->nbits = sctx->nbits;
  91     if (sctx->pub_exp) {
  92         dctx->pub_exp = BN_dup(sctx->pub_exp);
  93         if (!dctx->pub_exp)
  94             return 0;
  95     }
  96     dctx->pad_mode = sctx->pad_mode;
  97     dctx->md = sctx->md;
  98     dctx->mgf1md = sctx->mgf1md;
  99     dctx->saltlen = sctx->saltlen;
 100     if (sctx->oaep_label) {
 101         OPENSSL_free(dctx->oaep_label);
 102         dctx->oaep_label = OPENSSL_memdup(sctx->oaep_label, sctx->oaep_labellen);
 103         if (!dctx->oaep_label)
 104             return 0;
 105         dctx->oaep_labellen = sctx->oaep_labellen;
 106     }
 107     return 1;
 108 }
 109
 110 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
 111 {
 112     if (ctx->tbuf != NULL)
 113         return 1;
 114     if ((ctx->tbuf = OPENSSL_malloc(RSA_size(pk->pkey->pkey.rsa))) == NULL) {
 115         ERR_raise(ERR_LIB_RSA, ERR_R_MALLOC_FAILURE);
 116         return 0;
 117     }
 118     return 1;
 119 }
 120
 121 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
 122 {
 123     RSA_PKEY_CTX *rctx = ctx->data;
 124     if (rctx) {
 125         BN_free(rctx->pub_exp);
 126         OPENSSL_free(rctx->tbuf);
 127         OPENSSL_free(rctx->oaep_label);
 128         OPENSSL_free(rctx);
 129     }
 130 }
 131
 132 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
 133                          size_t *siglen, const unsigned char *tbs,
 134                          size_t tbslen)
 135 {
 136     int ret;
 137     RSA_PKEY_CTX *rctx = ctx->data;
 138     RSA *rsa = ctx->pkey->pkey.rsa;
 139
 140     if (rctx->md) {
 141         if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
 142             ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_DIGEST_LENGTH);
 143             return -1;
 144         }
 145
 146         if (EVP_MD_type(rctx->md) == NID_mdc2) {
 147             unsigned int sltmp;
 148             if (rctx->pad_mode != RSA_PKCS1_PADDING)
 149                 return -1;
 150             ret = RSA_sign_ASN1_OCTET_STRING(0,
 151                                              tbs, tbslen, sig, &sltmp, rsa);
 152
 153             if (ret <= 0)
 154                 return ret;
 155             ret = sltmp;
 156         } else if (rctx->pad_mode == RSA_X931_PADDING) {
 157             if ((size_t)RSA_size(rsa) < tbslen + 1) {
 158                 ERR_raise(ERR_LIB_RSA, RSA_R_KEY_SIZE_TOO_SMALL);
 159                 return -1;
 160             }
 161             if (!setup_tbuf(rctx, ctx)) {
 162                 ERR_raise(ERR_LIB_RSA, ERR_R_MALLOC_FAILURE);
 163                 return -1;
 164             }
 165             memcpy(rctx->tbuf, tbs, tbslen);
 166             rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
 167             ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
 168                                       sig, rsa, RSA_X931_PADDING);
 169         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 170             unsigned int sltmp;
 171             ret = RSA_sign(EVP_MD_type(rctx->md),
 172                            tbs, tbslen, sig, &sltmp, rsa);
 173             if (ret <= 0)
 174                 return ret;
 175             ret = sltmp;
 176         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 177             if (!setup_tbuf(rctx, ctx))
 178                 return -1;
 179             if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
 180                                                 rctx->tbuf, tbs,
 181                                                 rctx->md, rctx->mgf1md,
 182                                                 rctx->saltlen))
 183                 return -1;
 184             ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
 185                                       sig, rsa, RSA_NO_PADDING);
 186         } else {
 187             return -1;
 188         }
 189     } else {
 190         ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
 191                                   rctx->pad_mode);
 192     }
 193     if (ret < 0)
 194         return ret;
 195     *siglen = ret;
 196     return 1;
 197 }
 198
 199 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
 200                                   unsigned char *rout, size_t *routlen,
 201                                   const unsigned char *sig, size_t siglen)
 202 {
 203     int ret;
 204     RSA_PKEY_CTX *rctx = ctx->data;
 205
 206     if (rctx->md) {
 207         if (rctx->pad_mode == RSA_X931_PADDING) {
 208             if (!setup_tbuf(rctx, ctx))
 209                 return -1;
 210             ret = RSA_public_decrypt(siglen, sig,
 211                                      rctx->tbuf, ctx->pkey->pkey.rsa,
 212                                      RSA_X931_PADDING);
 213             if (ret < 1)
 214                 return 0;
 215             ret--;
 216             if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
 217                 ERR_raise(ERR_LIB_RSA, RSA_R_ALGORITHM_MISMATCH);
 218                 return 0;
 219             }
 220             if (ret != EVP_MD_size(rctx->md)) {
 221                 ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_DIGEST_LENGTH);
 222                 return 0;
 223             }
 224             if (rout)
 225                 memcpy(rout, rctx->tbuf, ret);
 226         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 227             size_t sltmp;
 228             ret = int_rsa_verify(EVP_MD_type(rctx->md),
 229                                  NULL, 0, rout, &sltmp,
 230                                  sig, siglen, ctx->pkey->pkey.rsa);
 231             if (ret <= 0)
 232                 return 0;
 233             ret = sltmp;
 234         } else {
 235             return -1;
 236         }
 237     } else {
 238         ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
 239                                  rctx->pad_mode);
 240     }
 241     if (ret < 0)
 242         return ret;
 243     *routlen = ret;
 244     return 1;
 245 }
 246
 247 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
 248                            const unsigned char *sig, size_t siglen,
 249                            const unsigned char *tbs, size_t tbslen)
 250 {
 251     RSA_PKEY_CTX *rctx = ctx->data;
 252     RSA *rsa = ctx->pkey->pkey.rsa;
 253     size_t rslen;
 254
 255     if (rctx->md) {
 256         if (rctx->pad_mode == RSA_PKCS1_PADDING)
 257             return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
 258                               sig, siglen, rsa);
 259         if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
 260             ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_DIGEST_LENGTH);
 261             return -1;
 262         }
 263         if (rctx->pad_mode == RSA_X931_PADDING) {
 264             if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
 265                 return 0;
 266         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 267             int ret;
 268             if (!setup_tbuf(rctx, ctx))
 269                 return -1;
 270             ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 271                                      rsa, RSA_NO_PADDING);
 272             if (ret <= 0)
 273                 return 0;
 274             ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
 275                                             rctx->md, rctx->mgf1md,
 276                                             rctx->tbuf, rctx->saltlen);
 277             if (ret <= 0)
 278                 return 0;
 279             return 1;
 280         } else {
 281             return -1;
 282         }
 283     } else {
 284         if (!setup_tbuf(rctx, ctx))
 285             return -1;
 286         rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 287                                    rsa, rctx->pad_mode);
 288         if (rslen == 0)
 289             return 0;
 290     }
 291
 292     if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
 293         return 0;
 294
 295     return 1;
 296
 297 }
 298
 299 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
 300                             unsigned char *out, size_t *outlen,
 301                             const unsigned char *in, size_t inlen)
 302 {
 303     int ret;
 304     RSA_PKEY_CTX *rctx = ctx->data;
 305
 306     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 307         int klen = RSA_size(ctx->pkey->pkey.rsa);
 308         if (!setup_tbuf(rctx, ctx))
 309             return -1;
 310         if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
 311                                              in, inlen,
 312                                              rctx->oaep_label,
 313                                              rctx->oaep_labellen,
 314                                              rctx->md, rctx->mgf1md))
 315             return -1;
 316         ret = RSA_public_encrypt(klen, rctx->tbuf, out,
 317                                  ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 318     } else {
 319         ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 320                                  rctx->pad_mode);
 321     }
 322     if (ret < 0)
 323         return ret;
 324     *outlen = ret;
 325     return 1;
 326 }
 327
 328 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
 329                             unsigned char *out, size_t *outlen,
 330                             const unsigned char *in, size_t inlen)
 331 {
 332     int ret;
 333     RSA_PKEY_CTX *rctx = ctx->data;
 334
 335     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 336         if (!setup_tbuf(rctx, ctx))
 337             return -1;
 338         ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
 339                                   ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 340         if (ret <= 0)
 341             return ret;
 342         ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf,
 343                                                 ret, ret,
 344                                                 rctx->oaep_label,
 345                                                 rctx->oaep_labellen,
 346                                                 rctx->md, rctx->mgf1md);
 347     } else {
 348         ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 349                                   rctx->pad_mode);
 350     }
 351     *outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
 352     ret = constant_time_select_int(constant_time_msb(ret), ret, 1);
 353     return ret;
 354 }
 355
 356 static int check_padding_md(const EVP_MD *md, int padding)
 357 {
 358     int mdnid;
 359
 360     if (!md)
 361         return 1;
 362
 363     mdnid = EVP_MD_type(md);
 364
 365     if (padding == RSA_NO_PADDING) {
 366         ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PADDING_MODE);
 367         return 0;
 368     }
 369
 370     if (padding == RSA_X931_PADDING) {
 371         if (RSA_X931_hash_id(mdnid) == -1) {
 372             ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_X931_DIGEST);
 373             return 0;
 374         }
 375     } else {
 376         switch(mdnid) {
 377         /* List of all supported RSA digests */
 378         case NID_sha1:
 379         case NID_sha224:
 380         case NID_sha256:
 381         case NID_sha384:
 382         case NID_sha512:
 383         case NID_sha512_224:
 384         case NID_sha512_256:
 385         case NID_md5:
 386         case NID_md5_sha1:
 387         case NID_md2:
 388         case NID_md4:
 389         case NID_mdc2:
 390         case NID_ripemd160:
 391         case NID_sha3_224:
 392         case NID_sha3_256:
 393         case NID_sha3_384:
 394         case NID_sha3_512:
 395             return 1;
 396
 397         default:
 398             ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_DIGEST);
 399             return 0;
 400
 401         }
 402     }
 403
 404     return 1;
 405 }
 406
 407 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 408 {
 409     RSA_PKEY_CTX *rctx = ctx->data;
 410
 411     switch (type) {
 412     case EVP_PKEY_CTRL_RSA_PADDING:
 413         if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
 414             if (!check_padding_md(rctx->md, p1))
 415                 return 0;
 416             if (p1 == RSA_PKCS1_PSS_PADDING) {
 417                 if (!(ctx->operation &
 418                       (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
 419                     goto bad_pad;
 420                 if (!rctx->md)
 421                     rctx->md = EVP_sha1();
 422             } else if (pkey_ctx_is_pss(ctx)) {
 423                 goto bad_pad;
 424             }
 425             if (p1 == RSA_PKCS1_OAEP_PADDING) {
 426                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
 427                     goto bad_pad;
 428                 if (!rctx->md)
 429                     rctx->md = EVP_sha1();
 430             }
 431             rctx->pad_mode = p1;
 432             return 1;
 433         }
 434  bad_pad:
 435         ERR_raise(ERR_LIB_RSA, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 436         return -2;
 437
 438     case EVP_PKEY_CTRL_GET_RSA_PADDING:
 439         *(int *)p2 = rctx->pad_mode;
 440         return 1;
 441
 442     case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
 443     case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
 444         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
 445             ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PSS_SALTLEN);
 446             return -2;
 447         }
 448         if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN) {
 449             *(int *)p2 = rctx->saltlen;
 450         } else {
 451             if (p1 < RSA_PSS_SALTLEN_MAX)
 452                 return -2;
 453             if (rsa_pss_restricted(rctx)) {
 454                 if (p1 == RSA_PSS_SALTLEN_AUTO
 455                     && ctx->operation == EVP_PKEY_OP_VERIFY) {
 456                     ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PSS_SALTLEN);
 457                     return -2;
 458                 }
 459                 if ((p1 == RSA_PSS_SALTLEN_DIGEST
 460                      && rctx->min_saltlen > EVP_MD_size(rctx->md))
 461                     || (p1 >= 0 && p1 < rctx->min_saltlen)) {
 462                     ERR_raise(ERR_LIB_RSA, RSA_R_PSS_SALTLEN_TOO_SMALL);
 463                     return 0;
 464                 }
 465             }
 466             rctx->saltlen = p1;
 467         }
 468         return 1;
 469
 470     case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
 471         if (p1 < RSA_MIN_MODULUS_BITS) {
 472             ERR_raise(ERR_LIB_RSA, RSA_R_KEY_SIZE_TOO_SMALL);
 473             return -2;
 474         }
 475         rctx->nbits = p1;
 476         return 1;
 477
 478     case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
 479         if (p2 == NULL || !BN_is_odd((BIGNUM *)p2) || BN_is_one((BIGNUM *)p2)) {
 480             ERR_raise(ERR_LIB_RSA, RSA_R_BAD_E_VALUE);
 481             return -2;
 482         }
 483         BN_free(rctx->pub_exp);
 484         rctx->pub_exp = p2;
 485         return 1;
 486
 487     case EVP_PKEY_CTRL_RSA_KEYGEN_PRIMES:
 488         if (p1 < RSA_DEFAULT_PRIME_NUM || p1 > RSA_MAX_PRIME_NUM) {
 489             ERR_raise(ERR_LIB_RSA, RSA_R_KEY_PRIME_NUM_INVALID);
 490             return -2;
 491         }
 492         rctx->primes = p1;
 493         return 1;
 494
 495     case EVP_PKEY_CTRL_RSA_OAEP_MD:
 496     case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
 497         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 498             ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PADDING_MODE);
 499             return -2;
 500         }
 501         if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
 502             *(const EVP_MD **)p2 = rctx->md;
 503         else
 504             rctx->md = p2;
 505         return 1;
 506
 507     case EVP_PKEY_CTRL_MD:
 508         if (!check_padding_md(p2, rctx->pad_mode))
 509             return 0;
 510         if (rsa_pss_restricted(rctx)) {
 511             if (EVP_MD_type(rctx->md) == EVP_MD_type(p2))
 512                 return 1;
 513             ERR_raise(ERR_LIB_RSA, RSA_R_DIGEST_NOT_ALLOWED);
 514             return 0;
 515         }
 516         rctx->md = p2;
 517         return 1;
 518
 519     case EVP_PKEY_CTRL_GET_MD:
 520         *(const EVP_MD **)p2 = rctx->md;
 521         return 1;
 522
 523     case EVP_PKEY_CTRL_RSA_MGF1_MD:
 524     case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
 525         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
 526             && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 527             ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_MGF1_MD);
 528             return -2;
 529         }
 530         if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
 531             if (rctx->mgf1md)
 532                 *(const EVP_MD **)p2 = rctx->mgf1md;
 533             else
 534                 *(const EVP_MD **)p2 = rctx->md;
 535         } else {
 536             if (rsa_pss_restricted(rctx)) {
 537                 if (EVP_MD_type(rctx->mgf1md) == EVP_MD_type(p2))
 538                     return 1;
 539                 ERR_raise(ERR_LIB_RSA, RSA_R_MGF1_DIGEST_NOT_ALLOWED);
 540                 return 0;
 541             }
 542             rctx->mgf1md = p2;
 543         }
 544         return 1;
 545
 546     case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
 547         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 548             ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PADDING_MODE);
 549             return -2;
 550         }
 551         OPENSSL_free(rctx->oaep_label);
 552         if (p2 && p1 > 0) {
 553             rctx->oaep_label = p2;
 554             rctx->oaep_labellen = p1;
 555         } else {
 556             rctx->oaep_label = NULL;
 557             rctx->oaep_labellen = 0;
 558         }
 559         return 1;
 560
 561     case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
 562         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 563             ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PADDING_MODE);
 564             return -2;
 565         }
 566         *(unsigned char **)p2 = rctx->oaep_label;
 567         return rctx->oaep_labellen;
 568
 569     case EVP_PKEY_CTRL_DIGESTINIT:
 570     case EVP_PKEY_CTRL_PKCS7_SIGN:
 571 #ifndef OPENSSL_NO_CMS
 572     case EVP_PKEY_CTRL_CMS_SIGN:
 573 #endif
 574     return 1;
 575
 576     case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 577     case EVP_PKEY_CTRL_PKCS7_DECRYPT:
 578 #ifndef OPENSSL_NO_CMS
 579     case EVP_PKEY_CTRL_CMS_DECRYPT:
 580     case EVP_PKEY_CTRL_CMS_ENCRYPT:
 581 #endif
 582     if (!pkey_ctx_is_pss(ctx))
 583         return 1;
 584     /* fall through */
 585     case EVP_PKEY_CTRL_PEER_KEY:
 586         ERR_raise(ERR_LIB_RSA, RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 587         return -2;
 588
 589     default:
 590         return -2;
 591
 592     }
 593 }
 594
 595 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 596                              const char *type, const char *value)
 597 {
 598     if (value == NULL) {
 599         ERR_raise(ERR_LIB_RSA, RSA_R_VALUE_MISSING);
 600         return 0;
 601     }
 602     if (strcmp(type, "rsa_padding_mode") == 0) {
 603         int pm;
 604
 605         if (strcmp(value, "pkcs1") == 0) {
 606             pm = RSA_PKCS1_PADDING;
 607         } else if (strcmp(value, "sslv23") == 0) {
 608             pm = RSA_SSLV23_PADDING;
 609         } else if (strcmp(value, "none") == 0) {
 610             pm = RSA_NO_PADDING;
 611         } else if (strcmp(value, "oeap") == 0) {
 612             pm = RSA_PKCS1_OAEP_PADDING;
 613         } else if (strcmp(value, "oaep") == 0) {
 614             pm = RSA_PKCS1_OAEP_PADDING;
 615         } else if (strcmp(value, "x931") == 0) {
 616             pm = RSA_X931_PADDING;
 617         } else if (strcmp(value, "pss") == 0) {
 618             pm = RSA_PKCS1_PSS_PADDING;
 619         } else {
 620             ERR_raise(ERR_LIB_RSA, RSA_R_UNKNOWN_PADDING_TYPE);
 621             return -2;
 622         }
 623         return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 624     }
 625
 626     if (strcmp(type, "rsa_pss_saltlen") == 0) {
 627         int saltlen;
 628
 629         if (!strcmp(value, "digest"))
 630             saltlen = RSA_PSS_SALTLEN_DIGEST;
 631         else if (!strcmp(value, "max"))
 632             saltlen = RSA_PSS_SALTLEN_MAX;
 633         else if (!strcmp(value, "auto"))
 634             saltlen = RSA_PSS_SALTLEN_AUTO;
 635         else
 636             saltlen = atoi(value);
 637         return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 638     }
 639
 640     if (strcmp(type, "rsa_keygen_bits") == 0) {
 641         int nbits = atoi(value);
 642
 643         return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
 644     }
 645
 646     if (strcmp(type, "rsa_keygen_pubexp") == 0) {
 647         int ret;
 648
 649         BIGNUM *pubexp = NULL;
 650         if (!BN_asc2bn(&pubexp, value))
 651             return 0;
 652         ret = EVP_PKEY_CTX_set1_rsa_keygen_pubexp(ctx, pubexp);
 653         BN_free(pubexp);
 654         return ret;
 655     }
 656
 657     if (strcmp(type, "rsa_keygen_primes") == 0) {
 658         int nprimes = atoi(value);
 659
 660         return EVP_PKEY_CTX_set_rsa_keygen_primes(ctx, nprimes);
 661     }
 662
 663     if (strcmp(type, "rsa_mgf1_md") == 0)
 664         return EVP_PKEY_CTX_md(ctx,
 665                                EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
 666                                EVP_PKEY_CTRL_RSA_MGF1_MD, value);
 667
 668     if (pkey_ctx_is_pss(ctx)) {
 669
 670         if (strcmp(type, "rsa_pss_keygen_mgf1_md") == 0)
 671             return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
 672                                    EVP_PKEY_CTRL_RSA_MGF1_MD, value);
 673
 674         if (strcmp(type, "rsa_pss_keygen_md") == 0)
 675             return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
 676                                    EVP_PKEY_CTRL_MD, value);
 677
 678         if (strcmp(type, "rsa_pss_keygen_saltlen") == 0) {
 679             int saltlen = atoi(value);
 680
 681             return EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(ctx, saltlen);
 682         }
 683     }
 684
 685     if (strcmp(type, "rsa_oaep_md") == 0)
 686         return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_TYPE_CRYPT,
 687                                EVP_PKEY_CTRL_RSA_OAEP_MD, value);
 688
 689     if (strcmp(type, "rsa_oaep_label") == 0) {
 690         unsigned char *lab;
 691         long lablen;
 692         int ret;
 693
 694         lab = OPENSSL_hexstr2buf(value, &lablen);
 695         if (!lab)
 696             return 0;
 697         ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
 698         if (ret <= 0)
 699             OPENSSL_free(lab);
 700         return ret;
 701     }
 702
 703     return -2;
 704 }
 705
 706 /* Set PSS parameters when generating a key, if necessary */
 707 static int rsa_set_pss_param(RSA *rsa, EVP_PKEY_CTX *ctx)
 708 {
 709     RSA_PKEY_CTX *rctx = ctx->data;
 710
 711     if (!pkey_ctx_is_pss(ctx))
 712         return 1;
 713     /* If all parameters are default values don't set pss */
 714     if (rctx->md == NULL && rctx->mgf1md == NULL && rctx->saltlen == -2)
 715         return 1;
 716     rsa->pss = rsa_pss_params_create(rctx->md, rctx->mgf1md,
 717                                      rctx->saltlen == -2 ? 0 : rctx->saltlen);
 718     if (rsa->pss == NULL)
 719         return 0;
 720     return 1;
 721 }
 722
 723 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 724 {
 725     RSA *rsa = NULL;
 726     RSA_PKEY_CTX *rctx = ctx->data;
 727     BN_GENCB *pcb;
 728     int ret;
 729
 730     if (rctx->pub_exp == NULL) {
 731         rctx->pub_exp = BN_new();
 732         if (rctx->pub_exp == NULL || !BN_set_word(rctx->pub_exp, RSA_F4))
 733             return 0;
 734     }
 735     rsa = RSA_new();
 736     if (rsa == NULL)
 737         return 0;
 738     if (ctx->pkey_gencb) {
 739         pcb = BN_GENCB_new();
 740         if (pcb == NULL) {
 741             RSA_free(rsa);
 742             return 0;
 743         }
 744         evp_pkey_set_cb_translate(pcb, ctx);
 745     } else {
 746         pcb = NULL;
 747     }
 748     ret = RSA_generate_multi_prime_key(rsa, rctx->nbits, rctx->primes,
 749                                        rctx->pub_exp, pcb);
 750     BN_GENCB_free(pcb);
 751     if (ret > 0 && !rsa_set_pss_param(rsa, ctx)) {
 752         RSA_free(rsa);
 753         return 0;
 754     }
 755     if (ret > 0)
 756         EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, rsa);
 757     else
 758         RSA_free(rsa);
 759     return ret;
 760 }
 761
 762 static const EVP_PKEY_METHOD rsa_pkey_meth = {
 763     EVP_PKEY_RSA,
 764     EVP_PKEY_FLAG_AUTOARGLEN,
 765     pkey_rsa_init,
 766     pkey_rsa_copy,
 767     pkey_rsa_cleanup,
 768
 769     0, 0,
 770
 771     0,
 772     pkey_rsa_keygen,
 773
 774     0,
 775     pkey_rsa_sign,
 776
 777     0,
 778     pkey_rsa_verify,
 779
 780     0,
 781     pkey_rsa_verifyrecover,
 782
 783     0, 0, 0, 0,
 784
 785     0,
 786     pkey_rsa_encrypt,
 787
 788     0,
 789     pkey_rsa_decrypt,
 790
 791     0, 0,
 792
 793     pkey_rsa_ctrl,
 794     pkey_rsa_ctrl_str
 795 };
 796
 797 const EVP_PKEY_METHOD *ossl_rsa_pkey_method(void)
 798 {
 799     return &rsa_pkey_meth;
 800 }
 801
 802 /*
 803  * Called for PSS sign or verify initialisation: checks PSS parameter
 804  * sanity and sets any restrictions on key usage.
 805  */
 806
 807 static int pkey_pss_init(EVP_PKEY_CTX *ctx)
 808 {
 809     RSA *rsa;
 810     RSA_PKEY_CTX *rctx = ctx->data;
 811     const EVP_MD *md;
 812     const EVP_MD *mgf1md;
 813     int min_saltlen, max_saltlen;
 814
 815     /* Should never happen */
 816     if (!pkey_ctx_is_pss(ctx))
 817         return 0;
 818     rsa = ctx->pkey->pkey.rsa;
 819     /* If no restrictions just return */
 820     if (rsa->pss == NULL)
 821         return 1;
 822     /* Get and check parameters */
 823     if (!rsa_pss_get_param(rsa->pss, &md, &mgf1md, &min_saltlen))
 824         return 0;
 825
 826     /* See if minimum salt length exceeds maximum possible */
 827     max_saltlen = RSA_size(rsa) - EVP_MD_size(md);
 828     if ((RSA_bits(rsa) & 0x7) == 1)
 829         max_saltlen--;
 830     if (min_saltlen > max_saltlen) {
 831         ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_SALT_LENGTH);
 832         return 0;
 833     }
 834
 835     rctx->min_saltlen = min_saltlen;
 836
 837     /*
 838      * Set PSS restrictions as defaults: we can then block any attempt to
 839      * use invalid values in pkey_rsa_ctrl
 840      */
 841
 842     rctx->md = md;
 843     rctx->mgf1md = mgf1md;
 844     rctx->saltlen = min_saltlen;
 845
 846     return 1;
 847 }
 848
 849 static const EVP_PKEY_METHOD rsa_pss_pkey_meth = {
 850     EVP_PKEY_RSA_PSS,
 851     EVP_PKEY_FLAG_AUTOARGLEN,
 852     pkey_rsa_init,
 853     pkey_rsa_copy,
 854     pkey_rsa_cleanup,
 855
 856     0, 0,
 857
 858     0,
 859     pkey_rsa_keygen,
 860
 861     pkey_pss_init,
 862     pkey_rsa_sign,
 863
 864     pkey_pss_init,
 865     pkey_rsa_verify,
 866
 867     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 868
 869     pkey_rsa_ctrl,
 870     pkey_rsa_ctrl_str
 871 };
 872
 873 const EVP_PKEY_METHOD *ossl_rsa_pss_pkey_method(void)
 874 {
 875     return &rsa_pss_pkey_meth;
 876 }