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         RSAerr(RSA_F_SETUP_TBUF, 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             RSAerr(RSA_F_PKEY_RSA_SIGN, 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                 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
 159                 return -1;
 160             }
 161             if (!setup_tbuf(rctx, ctx)) {
 162                 RSAerr(RSA_F_PKEY_RSA_SIGN, 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                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 218                        RSA_R_ALGORITHM_MISMATCH);
 219                 return 0;
 220             }
 221             if (ret != EVP_MD_size(rctx->md)) {
 222                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 223                        RSA_R_INVALID_DIGEST_LENGTH);
 224                 return 0;
 225             }
 226             if (rout)
 227                 memcpy(rout, rctx->tbuf, ret);
 228         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 229             size_t sltmp;
 230             ret = int_rsa_verify(EVP_MD_type(rctx->md),
 231                                  NULL, 0, rout, &sltmp,
 232                                  sig, siglen, ctx->pkey->pkey.rsa);
 233             if (ret <= 0)
 234                 return 0;
 235             ret = sltmp;
 236         } else {
 237             return -1;
 238         }
 239     } else {
 240         ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
 241                                  rctx->pad_mode);
 242     }
 243     if (ret < 0)
 244         return ret;
 245     *routlen = ret;
 246     return 1;
 247 }
 248
 249 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
 250                            const unsigned char *sig, size_t siglen,
 251                            const unsigned char *tbs, size_t tbslen)
 252 {
 253     RSA_PKEY_CTX *rctx = ctx->data;
 254     RSA *rsa = ctx->pkey->pkey.rsa;
 255     size_t rslen;
 256
 257     if (rctx->md) {
 258         if (rctx->pad_mode == RSA_PKCS1_PADDING)
 259             return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
 260                               sig, siglen, rsa);
 261         if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
 262             RSAerr(RSA_F_PKEY_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH);
 263             return -1;
 264         }
 265         if (rctx->pad_mode == RSA_X931_PADDING) {
 266             if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
 267                 return 0;
 268         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 269             int ret;
 270             if (!setup_tbuf(rctx, ctx))
 271                 return -1;
 272             ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 273                                      rsa, RSA_NO_PADDING);
 274             if (ret <= 0)
 275                 return 0;
 276             ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
 277                                             rctx->md, rctx->mgf1md,
 278                                             rctx->tbuf, rctx->saltlen);
 279             if (ret <= 0)
 280                 return 0;
 281             return 1;
 282         } else {
 283             return -1;
 284         }
 285     } else {
 286         if (!setup_tbuf(rctx, ctx))
 287             return -1;
 288         rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 289                                    rsa, rctx->pad_mode);
 290         if (rslen == 0)
 291             return 0;
 292     }
 293
 294     if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
 295         return 0;
 296
 297     return 1;
 298
 299 }
 300
 301 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
 302                             unsigned char *out, size_t *outlen,
 303                             const unsigned char *in, size_t inlen)
 304 {
 305     int ret;
 306     RSA_PKEY_CTX *rctx = ctx->data;
 307
 308     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 309         int klen = RSA_size(ctx->pkey->pkey.rsa);
 310         if (!setup_tbuf(rctx, ctx))
 311             return -1;
 312         if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
 313                                              in, inlen,
 314                                              rctx->oaep_label,
 315                                              rctx->oaep_labellen,
 316                                              rctx->md, rctx->mgf1md))
 317             return -1;
 318         ret = RSA_public_encrypt(klen, rctx->tbuf, out,
 319                                  ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 320     } else {
 321         ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 322                                  rctx->pad_mode);
 323     }
 324     if (ret < 0)
 325         return ret;
 326     *outlen = ret;
 327     return 1;
 328 }
 329
 330 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
 331                             unsigned char *out, size_t *outlen,
 332                             const unsigned char *in, size_t inlen)
 333 {
 334     int ret;
 335     RSA_PKEY_CTX *rctx = ctx->data;
 336
 337     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 338         if (!setup_tbuf(rctx, ctx))
 339             return -1;
 340         ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
 341                                   ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 342         if (ret <= 0)
 343             return ret;
 344         ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf,
 345                                                 ret, ret,
 346                                                 rctx->oaep_label,
 347                                                 rctx->oaep_labellen,
 348                                                 rctx->md, rctx->mgf1md);
 349     } else {
 350         ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 351                                   rctx->pad_mode);
 352     }
 353     *outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
 354     ret = constant_time_select_int(constant_time_msb(ret), ret, 1);
 355     return ret;
 356 }
 357
 358 static int check_padding_md(const EVP_MD *md, int padding)
 359 {
 360     int mdnid;
 361
 362     if (!md)
 363         return 1;
 364
 365     mdnid = EVP_MD_type(md);
 366
 367     if (padding == RSA_NO_PADDING) {
 368         RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
 369         return 0;
 370     }
 371
 372     if (padding == RSA_X931_PADDING) {
 373         if (RSA_X931_hash_id(mdnid) == -1) {
 374             RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
 375             return 0;
 376         }
 377     } else {
 378         switch(mdnid) {
 379         /* List of all supported RSA digests */
 380         case NID_sha1:
 381         case NID_sha224:
 382         case NID_sha256:
 383         case NID_sha384:
 384         case NID_sha512:
 385         case NID_sha512_224:
 386         case NID_sha512_256:
 387         case NID_md5:
 388         case NID_md5_sha1:
 389         case NID_md2:
 390         case NID_md4:
 391         case NID_mdc2:
 392         case NID_ripemd160:
 393         case NID_sha3_224:
 394         case NID_sha3_256:
 395         case NID_sha3_384:
 396         case NID_sha3_512:
 397             return 1;
 398
 399         default:
 400             RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_DIGEST);
 401             return 0;
 402
 403         }
 404     }
 405
 406     return 1;
 407 }
 408
 409 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 410 {
 411     RSA_PKEY_CTX *rctx = ctx->data;
 412
 413     switch (type) {
 414     case EVP_PKEY_CTRL_RSA_PADDING:
 415         if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
 416             if (!check_padding_md(rctx->md, p1))
 417                 return 0;
 418             if (p1 == RSA_PKCS1_PSS_PADDING) {
 419                 if (!(ctx->operation &
 420                       (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
 421                     goto bad_pad;
 422                 if (!rctx->md)
 423                     rctx->md = EVP_sha1();
 424             } else if (pkey_ctx_is_pss(ctx)) {
 425                 goto bad_pad;
 426             }
 427             if (p1 == RSA_PKCS1_OAEP_PADDING) {
 428                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
 429                     goto bad_pad;
 430                 if (!rctx->md)
 431                     rctx->md = EVP_sha1();
 432             }
 433             rctx->pad_mode = p1;
 434             return 1;
 435         }
 436  bad_pad:
 437         RSAerr(RSA_F_PKEY_RSA_CTRL,
 438                RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 439         return -2;
 440
 441     case EVP_PKEY_CTRL_GET_RSA_PADDING:
 442         *(int *)p2 = rctx->pad_mode;
 443         return 1;
 444
 445     case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
 446     case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
 447         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
 448             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 449             return -2;
 450         }
 451         if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN) {
 452             *(int *)p2 = rctx->saltlen;
 453         } else {
 454             if (p1 < RSA_PSS_SALTLEN_MAX)
 455                 return -2;
 456             if (rsa_pss_restricted(rctx)) {
 457                 if (p1 == RSA_PSS_SALTLEN_AUTO
 458                     && ctx->operation == EVP_PKEY_OP_VERIFY) {
 459                     RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 460                     return -2;
 461                 }
 462                 if ((p1 == RSA_PSS_SALTLEN_DIGEST
 463                      && rctx->min_saltlen > EVP_MD_size(rctx->md))
 464                     || (p1 >= 0 && p1 < rctx->min_saltlen)) {
 465                     RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_PSS_SALTLEN_TOO_SMALL);
 466                     return 0;
 467                 }
 468             }
 469             rctx->saltlen = p1;
 470         }
 471         return 1;
 472
 473     case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
 474         if (p1 < RSA_MIN_MODULUS_BITS) {
 475             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
 476             return -2;
 477         }
 478         rctx->nbits = p1;
 479         return 1;
 480
 481     case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
 482         if (p2 == NULL || !BN_is_odd((BIGNUM *)p2) || BN_is_one((BIGNUM *)p2)) {
 483             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_BAD_E_VALUE);
 484             return -2;
 485         }
 486         BN_free(rctx->pub_exp);
 487         rctx->pub_exp = p2;
 488         return 1;
 489
 490     case EVP_PKEY_CTRL_RSA_KEYGEN_PRIMES:
 491         if (p1 < RSA_DEFAULT_PRIME_NUM || p1 > RSA_MAX_PRIME_NUM) {
 492             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_PRIME_NUM_INVALID);
 493             return -2;
 494         }
 495         rctx->primes = p1;
 496         return 1;
 497
 498     case EVP_PKEY_CTRL_RSA_OAEP_MD:
 499     case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
 500         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 501             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 502             return -2;
 503         }
 504         if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
 505             *(const EVP_MD **)p2 = rctx->md;
 506         else
 507             rctx->md = p2;
 508         return 1;
 509
 510     case EVP_PKEY_CTRL_MD:
 511         if (!check_padding_md(p2, rctx->pad_mode))
 512             return 0;
 513         if (rsa_pss_restricted(rctx)) {
 514             if (EVP_MD_type(rctx->md) == EVP_MD_type(p2))
 515                 return 1;
 516             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_DIGEST_NOT_ALLOWED);
 517             return 0;
 518         }
 519         rctx->md = p2;
 520         return 1;
 521
 522     case EVP_PKEY_CTRL_GET_MD:
 523         *(const EVP_MD **)p2 = rctx->md;
 524         return 1;
 525
 526     case EVP_PKEY_CTRL_RSA_MGF1_MD:
 527     case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
 528         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
 529             && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 530             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
 531             return -2;
 532         }
 533         if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
 534             if (rctx->mgf1md)
 535                 *(const EVP_MD **)p2 = rctx->mgf1md;
 536             else
 537                 *(const EVP_MD **)p2 = rctx->md;
 538         } else {
 539             if (rsa_pss_restricted(rctx)) {
 540                 if (EVP_MD_type(rctx->mgf1md) == EVP_MD_type(p2))
 541                     return 1;
 542                 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_MGF1_DIGEST_NOT_ALLOWED);
 543                 return 0;
 544             }
 545             rctx->mgf1md = p2;
 546         }
 547         return 1;
 548
 549     case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
 550         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 551             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 552             return -2;
 553         }
 554         OPENSSL_free(rctx->oaep_label);
 555         if (p2 && p1 > 0) {
 556             rctx->oaep_label = p2;
 557             rctx->oaep_labellen = p1;
 558         } else {
 559             rctx->oaep_label = NULL;
 560             rctx->oaep_labellen = 0;
 561         }
 562         return 1;
 563
 564     case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
 565         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 566             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 567             return -2;
 568         }
 569         *(unsigned char **)p2 = rctx->oaep_label;
 570         return rctx->oaep_labellen;
 571
 572     case EVP_PKEY_CTRL_DIGESTINIT:
 573     case EVP_PKEY_CTRL_PKCS7_SIGN:
 574 #ifndef OPENSSL_NO_CMS
 575     case EVP_PKEY_CTRL_CMS_SIGN:
 576 #endif
 577     return 1;
 578
 579     case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 580     case EVP_PKEY_CTRL_PKCS7_DECRYPT:
 581 #ifndef OPENSSL_NO_CMS
 582     case EVP_PKEY_CTRL_CMS_DECRYPT:
 583     case EVP_PKEY_CTRL_CMS_ENCRYPT:
 584 #endif
 585     if (!pkey_ctx_is_pss(ctx))
 586         return 1;
 587     /* fall through */
 588     case EVP_PKEY_CTRL_PEER_KEY:
 589         RSAerr(RSA_F_PKEY_RSA_CTRL,
 590                RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 591         return -2;
 592
 593     default:
 594         return -2;
 595
 596     }
 597 }
 598
 599 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 600                              const char *type, const char *value)
 601 {
 602     if (value == NULL) {
 603         RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
 604         return 0;
 605     }
 606     if (strcmp(type, "rsa_padding_mode") == 0) {
 607         int pm;
 608
 609         if (strcmp(value, "pkcs1") == 0) {
 610             pm = RSA_PKCS1_PADDING;
 611         } else if (strcmp(value, "sslv23") == 0) {
 612             pm = RSA_SSLV23_PADDING;
 613         } else if (strcmp(value, "none") == 0) {
 614             pm = RSA_NO_PADDING;
 615         } else if (strcmp(value, "oeap") == 0) {
 616             pm = RSA_PKCS1_OAEP_PADDING;
 617         } else if (strcmp(value, "oaep") == 0) {
 618             pm = RSA_PKCS1_OAEP_PADDING;
 619         } else if (strcmp(value, "x931") == 0) {
 620             pm = RSA_X931_PADDING;
 621         } else if (strcmp(value, "pss") == 0) {
 622             pm = RSA_PKCS1_PSS_PADDING;
 623         } else {
 624             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
 625             return -2;
 626         }
 627         return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 628     }
 629
 630     if (strcmp(type, "rsa_pss_saltlen") == 0) {
 631         int saltlen;
 632
 633         if (!strcmp(value, "digest"))
 634             saltlen = RSA_PSS_SALTLEN_DIGEST;
 635         else if (!strcmp(value, "max"))
 636             saltlen = RSA_PSS_SALTLEN_MAX;
 637         else if (!strcmp(value, "auto"))
 638             saltlen = RSA_PSS_SALTLEN_AUTO;
 639         else
 640             saltlen = atoi(value);
 641         return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 642     }
 643
 644     if (strcmp(type, "rsa_keygen_bits") == 0) {
 645         int nbits = atoi(value);
 646
 647         return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
 648     }
 649
 650     if (strcmp(type, "rsa_keygen_pubexp") == 0) {
 651         int ret;
 652
 653         BIGNUM *pubexp = NULL;
 654         if (!BN_asc2bn(&pubexp, value))
 655             return 0;
 656         ret = EVP_PKEY_CTX_set1_rsa_keygen_pubexp(ctx, pubexp);
 657         BN_free(pubexp);
 658         return ret;
 659     }
 660
 661     if (strcmp(type, "rsa_keygen_primes") == 0) {
 662         int nprimes = atoi(value);
 663
 664         return EVP_PKEY_CTX_set_rsa_keygen_primes(ctx, nprimes);
 665     }
 666
 667     if (strcmp(type, "rsa_mgf1_md") == 0)
 668         return EVP_PKEY_CTX_md(ctx,
 669                                EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
 670                                EVP_PKEY_CTRL_RSA_MGF1_MD, value);
 671
 672     if (pkey_ctx_is_pss(ctx)) {
 673
 674         if (strcmp(type, "rsa_pss_keygen_mgf1_md") == 0)
 675             return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
 676                                    EVP_PKEY_CTRL_RSA_MGF1_MD, value);
 677
 678         if (strcmp(type, "rsa_pss_keygen_md") == 0)
 679             return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
 680                                    EVP_PKEY_CTRL_MD, value);
 681
 682         if (strcmp(type, "rsa_pss_keygen_saltlen") == 0) {
 683             int saltlen = atoi(value);
 684
 685             return EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(ctx, saltlen);
 686         }
 687     }
 688
 689     if (strcmp(type, "rsa_oaep_md") == 0)
 690         return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_TYPE_CRYPT,
 691                                EVP_PKEY_CTRL_RSA_OAEP_MD, value);
 692
 693     if (strcmp(type, "rsa_oaep_label") == 0) {
 694         unsigned char *lab;
 695         long lablen;
 696         int ret;
 697
 698         lab = OPENSSL_hexstr2buf(value, &lablen);
 699         if (!lab)
 700             return 0;
 701         ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
 702         if (ret <= 0)
 703             OPENSSL_free(lab);
 704         return ret;
 705     }
 706
 707     return -2;
 708 }
 709
 710 /* Set PSS parameters when generating a key, if necessary */
 711 static int rsa_set_pss_param(RSA *rsa, EVP_PKEY_CTX *ctx)
 712 {
 713     RSA_PKEY_CTX *rctx = ctx->data;
 714
 715     if (!pkey_ctx_is_pss(ctx))
 716         return 1;
 717     /* If all parameters are default values don't set pss */
 718     if (rctx->md == NULL && rctx->mgf1md == NULL && rctx->saltlen == -2)
 719         return 1;
 720     rsa->pss = rsa_pss_params_create(rctx->md, rctx->mgf1md,
 721                                      rctx->saltlen == -2 ? 0 : rctx->saltlen);
 722     if (rsa->pss == NULL)
 723         return 0;
 724     return 1;
 725 }
 726
 727 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 728 {
 729     RSA *rsa = NULL;
 730     RSA_PKEY_CTX *rctx = ctx->data;
 731     BN_GENCB *pcb;
 732     int ret;
 733
 734     if (rctx->pub_exp == NULL) {
 735         rctx->pub_exp = BN_new();
 736         if (rctx->pub_exp == NULL || !BN_set_word(rctx->pub_exp, RSA_F4))
 737             return 0;
 738     }
 739     rsa = RSA_new();
 740     if (rsa == NULL)
 741         return 0;
 742     if (ctx->pkey_gencb) {
 743         pcb = BN_GENCB_new();
 744         if (pcb == NULL) {
 745             RSA_free(rsa);
 746             return 0;
 747         }
 748         evp_pkey_set_cb_translate(pcb, ctx);
 749     } else {
 750         pcb = NULL;
 751     }
 752     ret = RSA_generate_multi_prime_key(rsa, rctx->nbits, rctx->primes,
 753                                        rctx->pub_exp, pcb);
 754     BN_GENCB_free(pcb);
 755     if (ret > 0 && !rsa_set_pss_param(rsa, ctx)) {
 756         RSA_free(rsa);
 757         return 0;
 758     }
 759     if (ret > 0)
 760         EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, rsa);
 761     else
 762         RSA_free(rsa);
 763     return ret;
 764 }
 765
 766 static const EVP_PKEY_METHOD rsa_pkey_meth = {
 767     EVP_PKEY_RSA,
 768     EVP_PKEY_FLAG_AUTOARGLEN,
 769     pkey_rsa_init,
 770     pkey_rsa_copy,
 771     pkey_rsa_cleanup,
 772
 773     0, 0,
 774
 775     0,
 776     pkey_rsa_keygen,
 777
 778     0,
 779     pkey_rsa_sign,
 780
 781     0,
 782     pkey_rsa_verify,
 783
 784     0,
 785     pkey_rsa_verifyrecover,
 786
 787     0, 0, 0, 0,
 788
 789     0,
 790     pkey_rsa_encrypt,
 791
 792     0,
 793     pkey_rsa_decrypt,
 794
 795     0, 0,
 796
 797     pkey_rsa_ctrl,
 798     pkey_rsa_ctrl_str
 799 };
 800
 801 const EVP_PKEY_METHOD *rsa_pkey_method(void)
 802 {
 803     return &rsa_pkey_meth;
 804 }
 805
 806 /*
 807  * Called for PSS sign or verify initialisation: checks PSS parameter
 808  * sanity and sets any restrictions on key usage.
 809  */
 810
 811 static int pkey_pss_init(EVP_PKEY_CTX *ctx)
 812 {
 813     RSA *rsa;
 814     RSA_PKEY_CTX *rctx = ctx->data;
 815     const EVP_MD *md;
 816     const EVP_MD *mgf1md;
 817     int min_saltlen, max_saltlen;
 818
 819     /* Should never happen */
 820     if (!pkey_ctx_is_pss(ctx))
 821         return 0;
 822     rsa = ctx->pkey->pkey.rsa;
 823     /* If no restrictions just return */
 824     if (rsa->pss == NULL)
 825         return 1;
 826     /* Get and check parameters */
 827     if (!rsa_pss_get_param(rsa->pss, &md, &mgf1md, &min_saltlen))
 828         return 0;
 829
 830     /* See if minimum salt length exceeds maximum possible */
 831     max_saltlen = RSA_size(rsa) - EVP_MD_size(md);
 832     if ((RSA_bits(rsa) & 0x7) == 1)
 833         max_saltlen--;
 834     if (min_saltlen > max_saltlen) {
 835         RSAerr(RSA_F_PKEY_PSS_INIT, RSA_R_INVALID_SALT_LENGTH);
 836         return 0;
 837     }
 838
 839     rctx->min_saltlen = min_saltlen;
 840
 841     /*
 842      * Set PSS restrictions as defaults: we can then block any attempt to
 843      * use invalid values in pkey_rsa_ctrl
 844      */
 845
 846     rctx->md = md;
 847     rctx->mgf1md = mgf1md;
 848     rctx->saltlen = min_saltlen;
 849
 850     return 1;
 851 }
 852
 853 static const EVP_PKEY_METHOD rsa_pss_pkey_meth = {
 854     EVP_PKEY_RSA_PSS,
 855     EVP_PKEY_FLAG_AUTOARGLEN,
 856     pkey_rsa_init,
 857     pkey_rsa_copy,
 858     pkey_rsa_cleanup,
 859
 860     0, 0,
 861
 862     0,
 863     pkey_rsa_keygen,
 864
 865     pkey_pss_init,
 866     pkey_rsa_sign,
 867
 868     pkey_pss_init,
 869     pkey_rsa_verify,
 870
 871     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 872
 873     pkey_rsa_ctrl,
 874     pkey_rsa_ctrl_str
 875 };
 876
 877 const EVP_PKEY_METHOD *rsa_pss_pkey_method(void)
 878 {
 879     return &rsa_pss_pkey_meth;
 880 }