crypto/rsa/rsa_pmeth.c

   1 /*
   2  * Copyright 2006-2016 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     /* Keygen callback info */
  29     int gentmp[2];
  30     /* RSA padding mode */
  31     int pad_mode;
  32     /* message digest */
  33     const EVP_MD *md;
  34     /* message digest for MGF1 */
  35     const EVP_MD *mgf1md;
  36     /* PSS salt length */
  37     int saltlen;
  38     /* Minimum salt length or -1 if no PSS parameter restriction */
  39     int min_saltlen;
  40     /* Temp buffer */
  41     unsigned char *tbuf;
  42     /* OAEP label */
  43     unsigned char *oaep_label;
  44     size_t oaep_labellen;
  45 } RSA_PKEY_CTX;
  46
  47 /* True if PSS parameters are restricted */
  48 #define rsa_pss_restricted(rctx) (rctx->min_saltlen != -1)
  49
  50 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
  51 {
  52     RSA_PKEY_CTX *rctx = OPENSSL_zalloc(sizeof(*rctx));
  53     if (rctx == NULL)
  54         return 0;
  55     rctx->nbits = 1024;
  56     if (pkey_ctx_is_pss(ctx))
  57         rctx->pad_mode = RSA_PKCS1_PSS_PADDING;
  58     else
  59         rctx->pad_mode = RSA_PKCS1_PADDING;
  60     rctx->saltlen = -2;
  61     rctx->min_saltlen = -1;
  62     ctx->data = rctx;
  63     ctx->keygen_info = rctx->gentmp;
  64     ctx->keygen_info_count = 2;
  65
  66     return 1;
  67 }
  68
  69 static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
  70 {
  71     RSA_PKEY_CTX *dctx, *sctx;
  72
  73     if (!pkey_rsa_init(dst))
  74         return 0;
  75     sctx = src->data;
  76     dctx = dst->data;
  77     dctx->nbits = sctx->nbits;
  78     if (sctx->pub_exp) {
  79         dctx->pub_exp = BN_dup(sctx->pub_exp);
  80         if (!dctx->pub_exp)
  81             return 0;
  82     }
  83     dctx->pad_mode = sctx->pad_mode;
  84     dctx->md = sctx->md;
  85     dctx->mgf1md = sctx->mgf1md;
  86     if (sctx->oaep_label) {
  87         OPENSSL_free(dctx->oaep_label);
  88         dctx->oaep_label = OPENSSL_memdup(sctx->oaep_label, sctx->oaep_labellen);
  89         if (!dctx->oaep_label)
  90             return 0;
  91         dctx->oaep_labellen = sctx->oaep_labellen;
  92     }
  93     return 1;
  94 }
  95
  96 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
  97 {
  98     if (ctx->tbuf != NULL)
  99         return 1;
 100     ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
 101     if (ctx->tbuf == NULL)
 102         return 0;
 103     return 1;
 104 }
 105
 106 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
 107 {
 108     RSA_PKEY_CTX *rctx = ctx->data;
 109     if (rctx) {
 110         BN_free(rctx->pub_exp);
 111         OPENSSL_free(rctx->tbuf);
 112         OPENSSL_free(rctx->oaep_label);
 113         OPENSSL_free(rctx);
 114     }
 115 }
 116
 117 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
 118                          size_t *siglen, const unsigned char *tbs,
 119                          size_t tbslen)
 120 {
 121     int ret;
 122     RSA_PKEY_CTX *rctx = ctx->data;
 123     RSA *rsa = ctx->pkey->pkey.rsa;
 124
 125     if (rctx->md) {
 126         if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
 127             RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_INVALID_DIGEST_LENGTH);
 128             return -1;
 129         }
 130
 131         if (EVP_MD_type(rctx->md) == NID_mdc2) {
 132             unsigned int sltmp;
 133             if (rctx->pad_mode != RSA_PKCS1_PADDING)
 134                 return -1;
 135             ret = RSA_sign_ASN1_OCTET_STRING(0,
 136                                              tbs, tbslen, sig, &sltmp, rsa);
 137
 138             if (ret <= 0)
 139                 return ret;
 140             ret = sltmp;
 141         } else if (rctx->pad_mode == RSA_X931_PADDING) {
 142             if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
 143                 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
 144                 return -1;
 145             }
 146             if (!setup_tbuf(rctx, ctx)) {
 147                 RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
 148                 return -1;
 149             }
 150             memcpy(rctx->tbuf, tbs, tbslen);
 151             rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
 152             ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
 153                                       sig, rsa, RSA_X931_PADDING);
 154         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 155             unsigned int sltmp;
 156             ret = RSA_sign(EVP_MD_type(rctx->md),
 157                            tbs, tbslen, sig, &sltmp, rsa);
 158             if (ret <= 0)
 159                 return ret;
 160             ret = sltmp;
 161         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 162             if (!setup_tbuf(rctx, ctx))
 163                 return -1;
 164             if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
 165                                                 rctx->tbuf, tbs,
 166                                                 rctx->md, rctx->mgf1md,
 167                                                 rctx->saltlen))
 168                 return -1;
 169             ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
 170                                       sig, rsa, RSA_NO_PADDING);
 171         } else
 172             return -1;
 173     } else
 174         ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
 175                                   rctx->pad_mode);
 176     if (ret < 0)
 177         return ret;
 178     *siglen = ret;
 179     return 1;
 180 }
 181
 182 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
 183                                   unsigned char *rout, size_t *routlen,
 184                                   const unsigned char *sig, size_t siglen)
 185 {
 186     int ret;
 187     RSA_PKEY_CTX *rctx = ctx->data;
 188
 189     if (rctx->md) {
 190         if (rctx->pad_mode == RSA_X931_PADDING) {
 191             if (!setup_tbuf(rctx, ctx))
 192                 return -1;
 193             ret = RSA_public_decrypt(siglen, sig,
 194                                      rctx->tbuf, ctx->pkey->pkey.rsa,
 195                                      RSA_X931_PADDING);
 196             if (ret < 1)
 197                 return 0;
 198             ret--;
 199             if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
 200                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 201                        RSA_R_ALGORITHM_MISMATCH);
 202                 return 0;
 203             }
 204             if (ret != EVP_MD_size(rctx->md)) {
 205                 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
 206                        RSA_R_INVALID_DIGEST_LENGTH);
 207                 return 0;
 208             }
 209             if (rout)
 210                 memcpy(rout, rctx->tbuf, ret);
 211         } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
 212             size_t sltmp;
 213             ret = int_rsa_verify(EVP_MD_type(rctx->md),
 214                                  NULL, 0, rout, &sltmp,
 215                                  sig, siglen, ctx->pkey->pkey.rsa);
 216             if (ret <= 0)
 217                 return 0;
 218             ret = sltmp;
 219         } else
 220             return -1;
 221     } else
 222         ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
 223                                  rctx->pad_mode);
 224     if (ret < 0)
 225         return ret;
 226     *routlen = ret;
 227     return 1;
 228 }
 229
 230 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
 231                            const unsigned char *sig, size_t siglen,
 232                            const unsigned char *tbs, size_t tbslen)
 233 {
 234     RSA_PKEY_CTX *rctx = ctx->data;
 235     RSA *rsa = ctx->pkey->pkey.rsa;
 236     size_t rslen;
 237
 238     if (rctx->md) {
 239         if (rctx->pad_mode == RSA_PKCS1_PADDING)
 240             return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
 241                               sig, siglen, rsa);
 242         if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
 243             RSAerr(RSA_F_PKEY_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH);
 244             return -1;
 245         }
 246         if (rctx->pad_mode == RSA_X931_PADDING) {
 247             if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
 248                 return 0;
 249         } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
 250             int ret;
 251             if (!setup_tbuf(rctx, ctx))
 252                 return -1;
 253             ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 254                                      rsa, RSA_NO_PADDING);
 255             if (ret <= 0)
 256                 return 0;
 257             ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
 258                                             rctx->md, rctx->mgf1md,
 259                                             rctx->tbuf, rctx->saltlen);
 260             if (ret <= 0)
 261                 return 0;
 262             return 1;
 263         } else
 264             return -1;
 265     } else {
 266         if (!setup_tbuf(rctx, ctx))
 267             return -1;
 268         rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
 269                                    rsa, rctx->pad_mode);
 270         if (rslen == 0)
 271             return 0;
 272     }
 273
 274     if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
 275         return 0;
 276
 277     return 1;
 278
 279 }
 280
 281 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
 282                             unsigned char *out, size_t *outlen,
 283                             const unsigned char *in, size_t inlen)
 284 {
 285     int ret;
 286     RSA_PKEY_CTX *rctx = ctx->data;
 287
 288     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 289         int klen = RSA_size(ctx->pkey->pkey.rsa);
 290         if (!setup_tbuf(rctx, ctx))
 291             return -1;
 292         if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
 293                                              in, inlen,
 294                                              rctx->oaep_label,
 295                                              rctx->oaep_labellen,
 296                                              rctx->md, rctx->mgf1md))
 297             return -1;
 298         ret = RSA_public_encrypt(klen, rctx->tbuf, out,
 299                                  ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 300     } else
 301         ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 302                                  rctx->pad_mode);
 303     if (ret < 0)
 304         return ret;
 305     *outlen = ret;
 306     return 1;
 307 }
 308
 309 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
 310                             unsigned char *out, size_t *outlen,
 311                             const unsigned char *in, size_t inlen)
 312 {
 313     int ret;
 314     RSA_PKEY_CTX *rctx = ctx->data;
 315
 316     if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
 317         int i;
 318         if (!setup_tbuf(rctx, ctx))
 319             return -1;
 320         ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
 321                                   ctx->pkey->pkey.rsa, RSA_NO_PADDING);
 322         if (ret <= 0)
 323             return ret;
 324         for (i = 0; i < ret; i++) {
 325             if (rctx->tbuf[i])
 326                 break;
 327         }
 328         ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf + i,
 329                                                 ret - i, ret,
 330                                                 rctx->oaep_label,
 331                                                 rctx->oaep_labellen,
 332                                                 rctx->md, rctx->mgf1md);
 333     } else
 334         ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
 335                                   rctx->pad_mode);
 336     if (ret < 0)
 337         return ret;
 338     *outlen = ret;
 339     return 1;
 340 }
 341
 342 static int check_padding_md(const EVP_MD *md, int padding)
 343 {
 344     int mdnid;
 345
 346     if (!md)
 347         return 1;
 348
 349     mdnid = EVP_MD_type(md);
 350
 351     if (padding == RSA_NO_PADDING) {
 352         RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
 353         return 0;
 354     }
 355
 356     if (padding == RSA_X931_PADDING) {
 357         if (RSA_X931_hash_id(mdnid) == -1) {
 358             RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
 359             return 0;
 360         }
 361     } else {
 362         switch(mdnid) {
 363         /* List of all supported RSA digests */
 364         case NID_sha1:
 365         case NID_sha224:
 366         case NID_sha256:
 367         case NID_sha384:
 368         case NID_sha512:
 369         case NID_md5:
 370         case NID_md5_sha1:
 371         case NID_md2:
 372         case NID_md4:
 373         case NID_mdc2:
 374         case NID_ripemd160:
 375             return 1;
 376
 377         default:
 378             RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_DIGEST);
 379             return 0;
 380
 381         }
 382     }
 383
 384     return 1;
 385 }
 386
 387 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 388 {
 389     RSA_PKEY_CTX *rctx = ctx->data;
 390
 391     switch (type) {
 392     case EVP_PKEY_CTRL_RSA_PADDING:
 393         if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
 394             if (!check_padding_md(rctx->md, p1))
 395                 return 0;
 396             if (p1 == RSA_PKCS1_PSS_PADDING) {
 397                 if (!(ctx->operation &
 398                       (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
 399                     goto bad_pad;
 400                 if (!rctx->md)
 401                     rctx->md = EVP_sha1();
 402             } else if (pkey_ctx_is_pss(ctx)) {
 403                 goto bad_pad;
 404             }
 405             if (p1 == RSA_PKCS1_OAEP_PADDING) {
 406                 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
 407                     goto bad_pad;
 408                 if (!rctx->md)
 409                     rctx->md = EVP_sha1();
 410             }
 411             rctx->pad_mode = p1;
 412             return 1;
 413         }
 414  bad_pad:
 415         RSAerr(RSA_F_PKEY_RSA_CTRL,
 416                RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 417         return -2;
 418
 419     case EVP_PKEY_CTRL_GET_RSA_PADDING:
 420         *(int *)p2 = rctx->pad_mode;
 421         return 1;
 422
 423     case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
 424     case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
 425         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
 426             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
 427             return -2;
 428         }
 429         if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN) {
 430             *(int *)p2 = rctx->saltlen;
 431         } else {
 432             if (p1 < -2)
 433                 return -2;
 434             if (rsa_pss_restricted(rctx) && p1 < rctx->min_saltlen) {
 435                 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_PSS_SALTLEN_TOO_SMALL);
 436                 return 0;
 437             }
 438             rctx->saltlen = p1;
 439         }
 440         return 1;
 441
 442     case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
 443         if (p1 < 512) {
 444             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
 445             return -2;
 446         }
 447         rctx->nbits = p1;
 448         return 1;
 449
 450     case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
 451         if (p2 == NULL || !BN_is_odd((BIGNUM *)p2) || BN_is_one((BIGNUM *)p2)) {
 452             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_BAD_E_VALUE);
 453             return -2;
 454         }
 455         BN_free(rctx->pub_exp);
 456         rctx->pub_exp = p2;
 457         return 1;
 458
 459     case EVP_PKEY_CTRL_RSA_OAEP_MD:
 460     case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
 461         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 462             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 463             return -2;
 464         }
 465         if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
 466             *(const EVP_MD **)p2 = rctx->md;
 467         else
 468             rctx->md = p2;
 469         return 1;
 470
 471     case EVP_PKEY_CTRL_MD:
 472         if (!check_padding_md(p2, rctx->pad_mode))
 473             return 0;
 474         if (rsa_pss_restricted(rctx)) {
 475             if (EVP_MD_type(rctx->md) == EVP_MD_type(p2))
 476                 return 1;
 477             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_DIGEST_NOT_ALLOWED);
 478             return 0;
 479         }
 480         rctx->md = p2;
 481         return 1;
 482
 483     case EVP_PKEY_CTRL_GET_MD:
 484         *(const EVP_MD **)p2 = rctx->md;
 485         return 1;
 486
 487     case EVP_PKEY_CTRL_RSA_MGF1_MD:
 488     case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
 489         if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
 490             && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 491             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
 492             return -2;
 493         }
 494         if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
 495             if (rctx->mgf1md)
 496                 *(const EVP_MD **)p2 = rctx->mgf1md;
 497             else
 498                 *(const EVP_MD **)p2 = rctx->md;
 499         } else {
 500             if (rsa_pss_restricted(rctx)) {
 501                 if (EVP_MD_type(rctx->md) == EVP_MD_type(p2))
 502                     return 1;
 503                 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_MGF1_DIGEST_NOT_ALLOWED);
 504                 return 0;
 505             }
 506             rctx->mgf1md = p2;
 507         }
 508         return 1;
 509
 510     case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
 511         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 512             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 513             return -2;
 514         }
 515         OPENSSL_free(rctx->oaep_label);
 516         if (p2 && p1 > 0) {
 517             rctx->oaep_label = p2;
 518             rctx->oaep_labellen = p1;
 519         } else {
 520             rctx->oaep_label = NULL;
 521             rctx->oaep_labellen = 0;
 522         }
 523         return 1;
 524
 525     case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
 526         if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
 527             RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
 528             return -2;
 529         }
 530         *(unsigned char **)p2 = rctx->oaep_label;
 531         return rctx->oaep_labellen;
 532
 533     case EVP_PKEY_CTRL_DIGESTINIT:
 534     case EVP_PKEY_CTRL_PKCS7_SIGN:
 535 #ifndef OPENSSL_NO_CMS
 536     case EVP_PKEY_CTRL_CMS_SIGN:
 537 #endif
 538     return 1;
 539
 540     case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 541     case EVP_PKEY_CTRL_PKCS7_DECRYPT:
 542 #ifndef OPENSSL_NO_CMS
 543     case EVP_PKEY_CTRL_CMS_DECRYPT:
 544     case EVP_PKEY_CTRL_CMS_ENCRYPT:
 545     if (!pkey_ctx_is_pss(ctx))
 546         return 1;
 547 #endif
 548     case EVP_PKEY_CTRL_PEER_KEY:
 549         RSAerr(RSA_F_PKEY_RSA_CTRL,
 550                RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 551         return -2;
 552
 553     default:
 554         return -2;
 555
 556     }
 557 }
 558
 559 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
 560                              const char *type, const char *value)
 561 {
 562     if (value == NULL) {
 563         RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
 564         return 0;
 565     }
 566     if (strcmp(type, "rsa_padding_mode") == 0) {
 567         int pm;
 568         if (strcmp(value, "pkcs1") == 0)
 569             pm = RSA_PKCS1_PADDING;
 570         else if (strcmp(value, "sslv23") == 0)
 571             pm = RSA_SSLV23_PADDING;
 572         else if (strcmp(value, "none") == 0)
 573             pm = RSA_NO_PADDING;
 574         else if (strcmp(value, "oeap") == 0)
 575             pm = RSA_PKCS1_OAEP_PADDING;
 576         else if (strcmp(value, "oaep") == 0)
 577             pm = RSA_PKCS1_OAEP_PADDING;
 578         else if (strcmp(value, "x931") == 0)
 579             pm = RSA_X931_PADDING;
 580         else if (strcmp(value, "pss") == 0)
 581             pm = RSA_PKCS1_PSS_PADDING;
 582         else {
 583             RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
 584             return -2;
 585         }
 586         return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
 587     }
 588
 589     if (strcmp(type, "rsa_pss_saltlen") == 0) {
 590         int saltlen;
 591         saltlen = atoi(value);
 592         return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
 593     }
 594
 595     if (strcmp(type, "rsa_keygen_bits") == 0) {
 596         int nbits;
 597         nbits = atoi(value);
 598         return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
 599     }
 600
 601     if (strcmp(type, "rsa_keygen_pubexp") == 0) {
 602         int ret;
 603         BIGNUM *pubexp = NULL;
 604         if (!BN_asc2bn(&pubexp, value))
 605             return 0;
 606         ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
 607         if (ret <= 0)
 608             BN_free(pubexp);
 609         return ret;
 610     }
 611
 612     if (strcmp(type, "rsa_mgf1_md") == 0)
 613         return EVP_PKEY_CTX_md(ctx,
 614                                EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
 615                                EVP_PKEY_CTRL_RSA_MGF1_MD, value);
 616
 617     if (pkey_ctx_is_pss(ctx)) {
 618
 619         if (strcmp(type, "rsa_pss_keygen_mgf1_md") == 0)
 620             return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
 621                                    EVP_PKEY_CTRL_RSA_MGF1_MD, value);
 622
 623         if (strcmp(type, "rsa_pss_keygen_md") == 0)
 624             return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
 625                                    EVP_PKEY_CTRL_MD, value);
 626
 627         if (strcmp(type, "rsa_pss_keygen_saltlen") == 0) {
 628             int saltlen;
 629             saltlen = atoi(value);
 630             return EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(ctx, saltlen);
 631         }
 632     }
 633
 634     if (strcmp(type, "rsa_oaep_md") == 0)
 635         return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_TYPE_CRYPT,
 636                                EVP_PKEY_CTRL_RSA_OAEP_MD, value);
 637
 638     if (strcmp(type, "rsa_oaep_label") == 0) {
 639         unsigned char *lab;
 640         long lablen;
 641         int ret;
 642         lab = OPENSSL_hexstr2buf(value, &lablen);
 643         if (!lab)
 644             return 0;
 645         ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
 646         if (ret <= 0)
 647             OPENSSL_free(lab);
 648         return ret;
 649     }
 650
 651     return -2;
 652 }
 653
 654 /* Set PSS parameters when generating a key, if necessary */
 655 static int rsa_set_pss_param(RSA *rsa, EVP_PKEY_CTX *ctx)
 656 {
 657     RSA_PKEY_CTX *rctx = ctx->data;
 658
 659     if (!pkey_ctx_is_pss(ctx))
 660         return 1;
 661     /* If all parameters are default values don't set pss */
 662     if (rctx->md == NULL && rctx->mgf1md == NULL && rctx->saltlen == -2)
 663         return 1;
 664     rsa->pss = rsa_pss_params_create(rctx->md, rctx->mgf1md,
 665                                      rctx->saltlen == -2 ? 0 : rctx->saltlen);
 666     if (rsa->pss == NULL)
 667         return 0;
 668     return 1;
 669 }
 670
 671 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 672 {
 673     RSA *rsa = NULL;
 674     RSA_PKEY_CTX *rctx = ctx->data;
 675     BN_GENCB *pcb;
 676     int ret;
 677
 678     if (rctx->pub_exp == NULL) {
 679         rctx->pub_exp = BN_new();
 680         if (rctx->pub_exp == NULL || !BN_set_word(rctx->pub_exp, RSA_F4))
 681             return 0;
 682     }
 683     rsa = RSA_new();
 684     if (rsa == NULL)
 685         return 0;
 686     if (ctx->pkey_gencb) {
 687         pcb = BN_GENCB_new();
 688         if (pcb == NULL) {
 689             RSA_free(rsa);
 690             return 0;
 691         }
 692         evp_pkey_set_cb_translate(pcb, ctx);
 693     } else
 694         pcb = NULL;
 695     ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
 696     BN_GENCB_free(pcb);
 697     if (ret > 0 && !rsa_set_pss_param(rsa, ctx)) {
 698         RSA_free(rsa);
 699         return 0;
 700     }
 701     if (ret > 0)
 702         EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, rsa);
 703     else
 704         RSA_free(rsa);
 705     return ret;
 706 }
 707
 708 const EVP_PKEY_METHOD rsa_pkey_meth = {
 709     EVP_PKEY_RSA,
 710     EVP_PKEY_FLAG_AUTOARGLEN,
 711     pkey_rsa_init,
 712     pkey_rsa_copy,
 713     pkey_rsa_cleanup,
 714
 715     0, 0,
 716
 717     0,
 718     pkey_rsa_keygen,
 719
 720     0,
 721     pkey_rsa_sign,
 722
 723     0,
 724     pkey_rsa_verify,
 725
 726     0,
 727     pkey_rsa_verifyrecover,
 728
 729     0, 0, 0, 0,
 730
 731     0,
 732     pkey_rsa_encrypt,
 733
 734     0,
 735     pkey_rsa_decrypt,
 736
 737     0, 0,
 738
 739     pkey_rsa_ctrl,
 740     pkey_rsa_ctrl_str
 741 };
 742
 743 /*
 744  * Called for PSS sign or verify initialisation: checks PSS parameter
 745  * sanity and sets any restrictions on key usage.
 746  */
 747
 748 static int pkey_pss_init(EVP_PKEY_CTX *ctx)
 749 {
 750     RSA *rsa;
 751     RSA_PKEY_CTX *rctx = ctx->data;
 752     const EVP_MD *md;
 753     const EVP_MD *mgf1md;
 754     int min_saltlen;
 755
 756     /* Should never happen */
 757     if (!pkey_ctx_is_pss(ctx))
 758         return 0;
 759     rsa = ctx->pkey->pkey.rsa;
 760     /* If no restrictions just return */
 761     if (rsa->pss == NULL)
 762         return 1;
 763     /* Get and check parameters */
 764     if (!rsa_pss_get_param(rsa->pss, &md, &mgf1md, &min_saltlen))
 765         return 0;
 766
 767     rctx->min_saltlen = min_saltlen;
 768
 769     /*
 770      * Set PSS restrictions as defaults: we can then block any attempt to
 771      * use invalid values in pkey_rsa_ctrl
 772      */
 773
 774     rctx->md = md;
 775     rctx->mgf1md = mgf1md;
 776     rctx->saltlen = min_saltlen;
 777
 778     return 1;
 779 }
 780
 781 const EVP_PKEY_METHOD rsa_pss_pkey_meth = {
 782     EVP_PKEY_RSA_PSS,
 783     EVP_PKEY_FLAG_AUTOARGLEN,
 784     pkey_rsa_init,
 785     pkey_rsa_copy,
 786     pkey_rsa_cleanup,
 787
 788     0, 0,
 789
 790     0,
 791     pkey_rsa_keygen,
 792
 793     pkey_pss_init,
 794     pkey_rsa_sign,
 795
 796     pkey_pss_init,
 797     pkey_rsa_verify,
 798
 799     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 800
 801     pkey_rsa_ctrl,
 802     pkey_rsa_ctrl_str
 803 };