crypto/rsa/rsa_ameth.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/bn.h>
  15 #include <openssl/cms.h>
  16 #include "internal/asn1_int.h"
  17 #include "internal/evp_int.h"
  18 #include "rsa_locl.h"
  19
  20 #ifndef OPENSSL_NO_CMS
  21 static int rsa_cms_sign(CMS_SignerInfo *si);
  22 static int rsa_cms_verify(CMS_SignerInfo *si);
  23 static int rsa_cms_decrypt(CMS_RecipientInfo *ri);
  24 static int rsa_cms_encrypt(CMS_RecipientInfo *ri);
  25 #endif
  26
  27 static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg);
  28
  29 /* Set any parameters associated with pkey */
  30 static int rsa_param_encode(const EVP_PKEY *pkey,
  31                             ASN1_STRING **pstr, int *pstrtype)
  32 {
  33     const RSA *rsa = pkey->pkey.rsa;
  34
  35     *pstr = NULL;
  36     /* If RSA it's just NULL type */
  37     if (pkey->ameth->pkey_id == EVP_PKEY_RSA) {
  38         *pstrtype = V_ASN1_NULL;
  39         return 1;
  40     }
  41     /* If no PSS parameters we omit parameters entirely */
  42     if (rsa->pss == NULL) {
  43         *pstrtype = V_ASN1_UNDEF;
  44         return 1;
  45     }
  46     /* Encode PSS parameters */
  47     if (ASN1_item_pack(rsa->pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), pstr) == NULL)
  48         return 0;
  49
  50     *pstrtype = V_ASN1_SEQUENCE;
  51     return 1;
  52 }
  53 /* Decode any parameters and set them in RSA structure */
  54 static int rsa_param_decode(RSA *rsa, const X509_ALGOR *alg)
  55 {
  56     const ASN1_OBJECT *algoid;
  57     const void *algp;
  58     int algptype;
  59
  60     X509_ALGOR_get0(&algoid, &algptype, &algp, alg);
  61     if (OBJ_obj2nid(algoid) == EVP_PKEY_RSA)
  62         return 1;
  63     if (algptype == V_ASN1_UNDEF)
  64         return 1;
  65     if (algptype != V_ASN1_SEQUENCE) {
  66         RSAerr(RSA_F_RSA_PARAM_DECODE, RSA_R_INVALID_PSS_PARAMETERS);
  67         return 0;
  68     }
  69     rsa->pss = rsa_pss_decode(alg);
  70     if (rsa->pss == NULL)
  71         return 0;
  72     return 1;
  73 }
  74
  75 static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
  76 {
  77     unsigned char *penc = NULL;
  78     int penclen;
  79     ASN1_STRING *str;
  80     int strtype;
  81
  82     if (!rsa_param_encode(pkey, &str, &strtype))
  83         return 0;
  84     penclen = i2d_RSAPublicKey(pkey->pkey.rsa, &penc);
  85     if (penclen <= 0)
  86         return 0;
  87     if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
  88                                strtype, str, penc, penclen))
  89         return 1;
  90
  91     OPENSSL_free(penc);
  92     return 0;
  93 }
  94
  95 static int rsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
  96 {
  97     const unsigned char *p;
  98     int pklen;
  99     X509_ALGOR *alg;
 100     RSA *rsa = NULL;
 101
 102     if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &alg, pubkey))
 103         return 0;
 104     if ((rsa = d2i_RSAPublicKey(NULL, &p, pklen)) == NULL) {
 105         RSAerr(RSA_F_RSA_PUB_DECODE, ERR_R_RSA_LIB);
 106         return 0;
 107     }
 108     if (!rsa_param_decode(rsa, alg)) {
 109         RSA_free(rsa);
 110         return 0;
 111     }
 112     EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa);
 113     return 1;
 114 }
 115
 116 static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 117 {
 118     if (BN_cmp(b->pkey.rsa->n, a->pkey.rsa->n) != 0
 119         || BN_cmp(b->pkey.rsa->e, a->pkey.rsa->e) != 0)
 120         return 0;
 121     return 1;
 122 }
 123
 124 static int old_rsa_priv_decode(EVP_PKEY *pkey,
 125                                const unsigned char **pder, int derlen)
 126 {
 127     RSA *rsa;
 128
 129     if ((rsa = d2i_RSAPrivateKey(NULL, pder, derlen)) == NULL) {
 130         RSAerr(RSA_F_OLD_RSA_PRIV_DECODE, ERR_R_RSA_LIB);
 131         return 0;
 132     }
 133     EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa);
 134     return 1;
 135 }
 136
 137 static int old_rsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
 138 {
 139     return i2d_RSAPrivateKey(pkey->pkey.rsa, pder);
 140 }
 141
 142 static int rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
 143 {
 144     unsigned char *rk = NULL;
 145     int rklen;
 146     ASN1_STRING *str;
 147     int strtype;
 148
 149     if (!rsa_param_encode(pkey, &str, &strtype))
 150         return 0;
 151     rklen = i2d_RSAPrivateKey(pkey->pkey.rsa, &rk);
 152
 153     if (rklen <= 0) {
 154         RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
 155         ASN1_STRING_free(str);
 156         return 0;
 157     }
 158
 159     if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
 160                          strtype, str, rk, rklen)) {
 161         RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
 162         ASN1_STRING_free(str);
 163         return 0;
 164     }
 165
 166     return 1;
 167 }
 168
 169 static int rsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
 170 {
 171     const unsigned char *p;
 172     RSA *rsa;
 173     int pklen;
 174     const X509_ALGOR *alg;
 175
 176     if (!PKCS8_pkey_get0(NULL, &p, &pklen, &alg, p8))
 177         return 0;
 178     rsa = d2i_RSAPrivateKey(NULL, &p, pklen);
 179     if (rsa == NULL) {
 180         RSAerr(RSA_F_RSA_PRIV_DECODE, ERR_R_RSA_LIB);
 181         return 0;
 182     }
 183     if (!rsa_param_decode(rsa, alg)) {
 184         RSA_free(rsa);
 185         return 0;
 186     }
 187     EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa);
 188     return 1;
 189 }
 190
 191 static int int_rsa_size(const EVP_PKEY *pkey)
 192 {
 193     return RSA_size(pkey->pkey.rsa);
 194 }
 195
 196 static int rsa_bits(const EVP_PKEY *pkey)
 197 {
 198     return BN_num_bits(pkey->pkey.rsa->n);
 199 }
 200
 201 static int rsa_security_bits(const EVP_PKEY *pkey)
 202 {
 203     return RSA_security_bits(pkey->pkey.rsa);
 204 }
 205
 206 static void int_rsa_free(EVP_PKEY *pkey)
 207 {
 208     RSA_free(pkey->pkey.rsa);
 209 }
 210
 211 static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg)
 212 {
 213     if (OBJ_obj2nid(alg->algorithm) != NID_mgf1)
 214         return NULL;
 215     return ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
 216                                      alg->parameter);
 217 }
 218
 219 static int rsa_pss_param_print(BIO *bp, int pss_key, RSA_PSS_PARAMS *pss,
 220                                int indent)
 221 {
 222     int rv = 0;
 223     X509_ALGOR *maskHash = NULL;
 224
 225     if (!BIO_indent(bp, indent, 128))
 226         goto err;
 227     if (pss_key) {
 228         if (pss == NULL) {
 229             if (BIO_puts(bp, "No PSS parameter restrictions\n") <= 0)
 230                 return 0;
 231             return 1;
 232         } else {
 233             if (BIO_puts(bp, "PSS parameter restrictions:") <= 0)
 234                 return 0;
 235         }
 236     } else if (pss == NULL) {
 237         if (BIO_puts(bp,"(INVALID PSS PARAMETERS)\n") <= 0)
 238             return 0;
 239         return 1;
 240     }
 241     if (BIO_puts(bp, "\n") <= 0)
 242         goto err;
 243     if (pss_key)
 244         indent += 2;
 245     if (!BIO_indent(bp, indent, 128))
 246         goto err;
 247     if (BIO_puts(bp, "Hash Algorithm: ") <= 0)
 248         goto err;
 249
 250     if (pss->hashAlgorithm) {
 251         if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0)
 252             goto err;
 253     } else if (BIO_puts(bp, "sha1 (default)") <= 0)
 254         goto err;
 255
 256     if (BIO_puts(bp, "\n") <= 0)
 257         goto err;
 258
 259     if (!BIO_indent(bp, indent, 128))
 260         goto err;
 261
 262     if (BIO_puts(bp, "Mask Algorithm: ") <= 0)
 263         goto err;
 264     if (pss->maskGenAlgorithm) {
 265         if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0)
 266             goto err;
 267         if (BIO_puts(bp, " with ") <= 0)
 268             goto err;
 269         maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
 270         if (maskHash != NULL) {
 271             if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0)
 272                 goto err;
 273         } else if (BIO_puts(bp, "INVALID") <= 0)
 274             goto err;
 275     } else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0)
 276         goto err;
 277     BIO_puts(bp, "\n");
 278
 279     if (!BIO_indent(bp, indent, 128))
 280         goto err;
 281     if (BIO_printf(bp, "%s Salt Length: 0x", pss_key ? "Minimum" : "") <= 0)
 282         goto err;
 283     if (pss->saltLength) {
 284         if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0)
 285             goto err;
 286     } else if (BIO_puts(bp, "14 (default)") <= 0)
 287         goto err;
 288     BIO_puts(bp, "\n");
 289
 290     if (!BIO_indent(bp, indent, 128))
 291         goto err;
 292     if (BIO_puts(bp, "Trailer Field: 0x") <= 0)
 293         goto err;
 294     if (pss->trailerField) {
 295         if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0)
 296             goto err;
 297     } else if (BIO_puts(bp, "BC (default)") <= 0)
 298         goto err;
 299     BIO_puts(bp, "\n");
 300
 301     rv = 1;
 302
 303  err:
 304     X509_ALGOR_free(maskHash);
 305     return rv;
 306
 307 }
 308
 309 static int pkey_rsa_print(BIO *bp, const EVP_PKEY *pkey, int off, int priv)
 310 {
 311     const RSA *x = pkey->pkey.rsa;
 312     char *str;
 313     const char *s;
 314     int ret = 0, mod_len = 0;
 315
 316     if (x->n != NULL)
 317         mod_len = BN_num_bits(x->n);
 318
 319     if (!BIO_indent(bp, off, 128))
 320         goto err;
 321
 322     if (BIO_printf(bp, "%s ", pkey_is_pss(pkey) ?  "RSA-PSS" : "RSA") <= 0)
 323         goto err;
 324
 325     if (priv && x->d) {
 326         if (BIO_printf(bp, "Private-Key: (%d bit)\n", mod_len) <= 0)
 327             goto err;
 328         str = "modulus:";
 329         s = "publicExponent:";
 330     } else {
 331         if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0)
 332             goto err;
 333         str = "Modulus:";
 334         s = "Exponent:";
 335     }
 336     if (!ASN1_bn_print(bp, str, x->n, NULL, off))
 337         goto err;
 338     if (!ASN1_bn_print(bp, s, x->e, NULL, off))
 339         goto err;
 340     if (priv) {
 341         if (!ASN1_bn_print(bp, "privateExponent:", x->d, NULL, off))
 342             goto err;
 343         if (!ASN1_bn_print(bp, "prime1:", x->p, NULL, off))
 344             goto err;
 345         if (!ASN1_bn_print(bp, "prime2:", x->q, NULL, off))
 346             goto err;
 347         if (!ASN1_bn_print(bp, "exponent1:", x->dmp1, NULL, off))
 348             goto err;
 349         if (!ASN1_bn_print(bp, "exponent2:", x->dmq1, NULL, off))
 350             goto err;
 351         if (!ASN1_bn_print(bp, "coefficient:", x->iqmp, NULL, off))
 352             goto err;
 353     }
 354     if (pkey_is_pss(pkey) && !rsa_pss_param_print(bp, 1, x->pss, off))
 355         goto err;
 356     ret = 1;
 357  err:
 358     return ret;
 359 }
 360
 361 static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 362                          ASN1_PCTX *ctx)
 363 {
 364     return pkey_rsa_print(bp, pkey, indent, 0);
 365 }
 366
 367 static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 368                           ASN1_PCTX *ctx)
 369 {
 370     return pkey_rsa_print(bp, pkey, indent, 1);
 371 }
 372
 373 static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg)
 374 {
 375     RSA_PSS_PARAMS *pss;
 376
 377     pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_PSS_PARAMS),
 378                                     alg->parameter);
 379
 380     if (pss == NULL)
 381         return NULL;
 382
 383     if (pss->maskGenAlgorithm != NULL) {
 384         pss->maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
 385         if (pss->maskHash == NULL) {
 386             RSA_PSS_PARAMS_free(pss);
 387             return NULL;
 388         }
 389     }
 390
 391     return pss;
 392 }
 393
 394 static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
 395                          const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
 396 {
 397     if (OBJ_obj2nid(sigalg->algorithm) == EVP_PKEY_RSA_PSS) {
 398         int rv;
 399         RSA_PSS_PARAMS *pss = rsa_pss_decode(sigalg);
 400
 401         rv = rsa_pss_param_print(bp, 0, pss, indent);
 402         RSA_PSS_PARAMS_free(pss);
 403         if (!rv)
 404             return 0;
 405     } else if (!sig && BIO_puts(bp, "\n") <= 0) {
 406         return 0;
 407     }
 408     if (sig)
 409         return X509_signature_dump(bp, sig, indent);
 410     return 1;
 411 }
 412
 413 static int rsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
 414 {
 415     X509_ALGOR *alg = NULL;
 416
 417     switch (op) {
 418
 419     case ASN1_PKEY_CTRL_PKCS7_SIGN:
 420         if (arg1 == 0)
 421             PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, NULL, &alg);
 422         break;
 423
 424     case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
 425         if (pkey_is_pss(pkey))
 426             return -2;
 427         if (arg1 == 0)
 428             PKCS7_RECIP_INFO_get0_alg(arg2, &alg);
 429         break;
 430 #ifndef OPENSSL_NO_CMS
 431     case ASN1_PKEY_CTRL_CMS_SIGN:
 432         if (arg1 == 0)
 433             return rsa_cms_sign(arg2);
 434         else if (arg1 == 1)
 435             return rsa_cms_verify(arg2);
 436         break;
 437
 438     case ASN1_PKEY_CTRL_CMS_ENVELOPE:
 439         if (pkey_is_pss(pkey))
 440             return -2;
 441         if (arg1 == 0)
 442             return rsa_cms_encrypt(arg2);
 443         else if (arg1 == 1)
 444             return rsa_cms_decrypt(arg2);
 445         break;
 446
 447     case ASN1_PKEY_CTRL_CMS_RI_TYPE:
 448         if (pkey_is_pss(pkey))
 449             return -2;
 450         *(int *)arg2 = CMS_RECIPINFO_TRANS;
 451         return 1;
 452 #endif
 453
 454     case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
 455         *(int *)arg2 = NID_sha256;
 456         return 1;
 457
 458     default:
 459         return -2;
 460
 461     }
 462
 463     if (alg)
 464         X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
 465
 466     return 1;
 467
 468 }
 469
 470 /* allocate and set algorithm ID from EVP_MD, default SHA1 */
 471 static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md)
 472 {
 473     if (md == NULL || EVP_MD_type(md) == NID_sha1)
 474         return 1;
 475     *palg = X509_ALGOR_new();
 476     if (*palg == NULL)
 477         return 0;
 478     X509_ALGOR_set_md(*palg, md);
 479     return 1;
 480 }
 481
 482 /* Allocate and set MGF1 algorithm ID from EVP_MD */
 483 static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md)
 484 {
 485     X509_ALGOR *algtmp = NULL;
 486     ASN1_STRING *stmp = NULL;
 487
 488     *palg = NULL;
 489     if (mgf1md == NULL || EVP_MD_type(mgf1md) == NID_sha1)
 490         return 1;
 491     /* need to embed algorithm ID inside another */
 492     if (!rsa_md_to_algor(&algtmp, mgf1md))
 493         goto err;
 494     if (ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp) == NULL)
 495          goto err;
 496     *palg = X509_ALGOR_new();
 497     if (*palg == NULL)
 498         goto err;
 499     X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp);
 500     stmp = NULL;
 501  err:
 502     ASN1_STRING_free(stmp);
 503     X509_ALGOR_free(algtmp);
 504     if (*palg)
 505         return 1;
 506     return 0;
 507 }
 508
 509 /* convert algorithm ID to EVP_MD, default SHA1 */
 510 static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg)
 511 {
 512     const EVP_MD *md;
 513
 514     if (!alg)
 515         return EVP_sha1();
 516     md = EVP_get_digestbyobj(alg->algorithm);
 517     if (md == NULL)
 518         RSAerr(RSA_F_RSA_ALGOR_TO_MD, RSA_R_UNKNOWN_DIGEST);
 519     return md;
 520 }
 521
 522 /*
 523  * Convert EVP_PKEY_CTX in PSS mode into corresponding algorithm parameter,
 524  * suitable for setting an AlgorithmIdentifier.
 525  */
 526
 527 static RSA_PSS_PARAMS *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx)
 528 {
 529     const EVP_MD *sigmd, *mgf1md;
 530     EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx);
 531     int saltlen;
 532
 533     if (EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) <= 0)
 534         return NULL;
 535     if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
 536         return NULL;
 537     if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen))
 538         return NULL;
 539     if (saltlen == -1)
 540         saltlen = EVP_MD_size(sigmd);
 541     else if (saltlen == -2) {
 542         saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
 543         if ((EVP_PKEY_bits(pk) & 0x7) == 1)
 544             saltlen--;
 545     }
 546
 547     return rsa_pss_params_create(sigmd, mgf1md, saltlen);
 548 }
 549
 550 RSA_PSS_PARAMS *rsa_pss_params_create(const EVP_MD *sigmd,
 551                                       const EVP_MD *mgf1md, int saltlen)
 552 {
 553     RSA_PSS_PARAMS *pss = RSA_PSS_PARAMS_new();
 554
 555     if (pss == NULL)
 556         goto err;
 557     if (saltlen != 20) {
 558         pss->saltLength = ASN1_INTEGER_new();
 559         if (pss->saltLength == NULL)
 560             goto err;
 561         if (!ASN1_INTEGER_set(pss->saltLength, saltlen))
 562             goto err;
 563     }
 564     if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd))
 565         goto err;
 566     if (mgf1md == NULL)
 567         mgf1md = sigmd;
 568     if (!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md))
 569         goto err;
 570     return pss;
 571  err:
 572     RSA_PSS_PARAMS_free(pss);
 573     return NULL;
 574 }
 575
 576 static ASN1_STRING *rsa_ctx_to_pss_string(EVP_PKEY_CTX *pkctx)
 577 {
 578     RSA_PSS_PARAMS *pss = rsa_ctx_to_pss(pkctx);
 579     ASN1_STRING *os;
 580
 581     if (pss == NULL)
 582         return NULL;
 583
 584     os = ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), NULL);
 585     RSA_PSS_PARAMS_free(pss);
 586     return os;
 587 }
 588
 589 /*
 590  * From PSS AlgorithmIdentifier set public key parameters. If pkey isn't NULL
 591  * then the EVP_MD_CTX is setup and initialised. If it is NULL parameters are
 592  * passed to pkctx instead.
 593  */
 594
 595 static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx,
 596                           X509_ALGOR *sigalg, EVP_PKEY *pkey)
 597 {
 598     int rv = -1;
 599     int saltlen;
 600     const EVP_MD *mgf1md = NULL, *md = NULL;
 601     RSA_PSS_PARAMS *pss;
 602
 603     /* Sanity check: make sure it is PSS */
 604     if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) {
 605         RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
 606         return -1;
 607     }
 608     /* Decode PSS parameters */
 609     pss = rsa_pss_decode(sigalg);
 610
 611     if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) {
 612         RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_PSS_PARAMETERS);
 613         goto err;
 614     }
 615
 616     /* We have all parameters now set up context */
 617     if (pkey) {
 618         if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey))
 619             goto err;
 620     } else {
 621         const EVP_MD *checkmd;
 622         if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0)
 623             goto err;
 624         if (EVP_MD_type(md) != EVP_MD_type(checkmd)) {
 625             RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_DIGEST_DOES_NOT_MATCH);
 626             goto err;
 627         }
 628     }
 629
 630     if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0)
 631         goto err;
 632
 633     if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0)
 634         goto err;
 635
 636     if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
 637         goto err;
 638     /* Carry on */
 639     rv = 1;
 640
 641  err:
 642     RSA_PSS_PARAMS_free(pss);
 643     return rv;
 644 }
 645
 646 int rsa_pss_get_param(const RSA_PSS_PARAMS *pss, const EVP_MD **pmd,
 647                       const EVP_MD **pmgf1md, int *psaltlen)
 648 {
 649     if (pss == NULL)
 650         return 0;
 651     *pmd = rsa_algor_to_md(pss->hashAlgorithm);
 652     if (*pmd == NULL)
 653         return 0;
 654     *pmgf1md = rsa_algor_to_md(pss->maskHash);
 655     if (*pmgf1md == NULL)
 656         return 0;
 657     if (pss->saltLength) {
 658         *psaltlen = ASN1_INTEGER_get(pss->saltLength);
 659         if (*psaltlen < 0) {
 660             RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_SALT_LENGTH);
 661             return 0;
 662         }
 663     } else {
 664         *psaltlen = 20;
 665     }
 666
 667     /*
 668      * low-level routines support only trailer field 0xbc (value 1) and
 669      * PKCS#1 says we should reject any other value anyway.
 670      */
 671     if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) {
 672         RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_TRAILER);
 673         return 0;
 674     }
 675
 676     return 1;
 677 }
 678
 679 #ifndef OPENSSL_NO_CMS
 680 static int rsa_cms_verify(CMS_SignerInfo *si)
 681 {
 682     int nid, nid2;
 683     X509_ALGOR *alg;
 684     EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
 685
 686     CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
 687     nid = OBJ_obj2nid(alg->algorithm);
 688     if (nid == EVP_PKEY_RSA_PSS)
 689         return rsa_pss_to_ctx(NULL, pkctx, alg, NULL);
 690     /* Only PSS allowed for PSS keys */
 691     if (pkey_ctx_is_pss(pkctx)) {
 692         RSAerr(RSA_F_RSA_CMS_VERIFY, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
 693         return 0;
 694     }
 695     if (nid == NID_rsaEncryption)
 696         return 1;
 697     /* Workaround for some implementation that use a signature OID */
 698     if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
 699         if (nid2 == NID_rsaEncryption)
 700             return 1;
 701     }
 702     return 0;
 703 }
 704 #endif
 705
 706 /*
 707  * Customised RSA item verification routine. This is called when a signature
 708  * is encountered requiring special handling. We currently only handle PSS.
 709  */
 710
 711 static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
 712                            X509_ALGOR *sigalg, ASN1_BIT_STRING *sig,
 713                            EVP_PKEY *pkey)
 714 {
 715     /* Sanity check: make sure it is PSS */
 716     if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) {
 717         RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
 718         return -1;
 719     }
 720     if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) {
 721         /* Carry on */
 722         return 2;
 723     }
 724     return -1;
 725 }
 726
 727 #ifndef OPENSSL_NO_CMS
 728 static int rsa_cms_sign(CMS_SignerInfo *si)
 729 {
 730     int pad_mode = RSA_PKCS1_PADDING;
 731     X509_ALGOR *alg;
 732     EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
 733     ASN1_STRING *os = NULL;
 734
 735     CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
 736     if (pkctx) {
 737         if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
 738             return 0;
 739     }
 740     if (pad_mode == RSA_PKCS1_PADDING) {
 741         X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
 742         return 1;
 743     }
 744     /* We don't support it */
 745     if (pad_mode != RSA_PKCS1_PSS_PADDING)
 746         return 0;
 747     os = rsa_ctx_to_pss_string(pkctx);
 748     if (!os)
 749         return 0;
 750     X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_PKEY_RSA_PSS), V_ASN1_SEQUENCE, os);
 751     return 1;
 752 }
 753 #endif
 754
 755 static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
 756                          X509_ALGOR *alg1, X509_ALGOR *alg2,
 757                          ASN1_BIT_STRING *sig)
 758 {
 759     int pad_mode;
 760     EVP_PKEY_CTX *pkctx = EVP_MD_CTX_pkey_ctx(ctx);
 761
 762     if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
 763         return 0;
 764     if (pad_mode == RSA_PKCS1_PADDING)
 765         return 2;
 766     if (pad_mode == RSA_PKCS1_PSS_PADDING) {
 767         ASN1_STRING *os1 = NULL;
 768         os1 = rsa_ctx_to_pss_string(pkctx);
 769         if (!os1)
 770             return 0;
 771         /* Duplicate parameters if we have to */
 772         if (alg2) {
 773             ASN1_STRING *os2 = ASN1_STRING_dup(os1);
 774             if (!os2) {
 775                 ASN1_STRING_free(os1);
 776                 return 0;
 777             }
 778             X509_ALGOR_set0(alg2, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
 779                             V_ASN1_SEQUENCE, os2);
 780         }
 781         X509_ALGOR_set0(alg1, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
 782                         V_ASN1_SEQUENCE, os1);
 783         return 3;
 784     }
 785     return 2;
 786 }
 787
 788 static int rsa_sig_info_set(X509_SIG_INFO *siginf, const X509_ALGOR *sigalg,
 789                             const ASN1_STRING *sig)
 790 {
 791     int rv = 0;
 792     int mdnid, saltlen;
 793     uint32_t flags;
 794     const EVP_MD *mgf1md = NULL, *md = NULL;
 795     RSA_PSS_PARAMS *pss;
 796
 797     /* Sanity check: make sure it is PSS */
 798     if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS)
 799         return 0;
 800     /* Decode PSS parameters */
 801     pss = rsa_pss_decode(sigalg);
 802     if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen))
 803         goto err;
 804     mdnid = EVP_MD_type(md);
 805     /*
 806      * For TLS need SHA256, SHA384 or SHA512, digest and MGF1 digest must
 807      * match and salt length must equal digest size
 808      */
 809     if ((mdnid == NID_sha256 || mdnid == NID_sha384 || mdnid == NID_sha512)
 810             && mdnid == EVP_MD_type(mgf1md) && saltlen == EVP_MD_size(md))
 811         flags = X509_SIG_INFO_TLS;
 812     else
 813         flags = 0;
 814     /* Note: security bits half number of digest bits */
 815     X509_SIG_INFO_set(siginf, mdnid, EVP_PKEY_RSA_PSS, EVP_MD_size(md) * 4,
 816                       flags);
 817     rv = 1;
 818     err:
 819     RSA_PSS_PARAMS_free(pss);
 820     return rv;
 821 }
 822
 823 #ifndef OPENSSL_NO_CMS
 824 static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg)
 825 {
 826     RSA_OAEP_PARAMS *oaep;
 827
 828     oaep = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS),
 829                                      alg->parameter);
 830
 831     if (oaep == NULL)
 832         return NULL;
 833
 834     if (oaep->maskGenFunc != NULL) {
 835         oaep->maskHash = rsa_mgf1_decode(oaep->maskGenFunc);
 836         if (oaep->maskHash == NULL) {
 837             RSA_OAEP_PARAMS_free(oaep);
 838             return NULL;
 839         }
 840     }
 841     return oaep;
 842 }
 843
 844 static int rsa_cms_decrypt(CMS_RecipientInfo *ri)
 845 {
 846     EVP_PKEY_CTX *pkctx;
 847     X509_ALGOR *cmsalg;
 848     int nid;
 849     int rv = -1;
 850     unsigned char *label = NULL;
 851     int labellen = 0;
 852     const EVP_MD *mgf1md = NULL, *md = NULL;
 853     RSA_OAEP_PARAMS *oaep;
 854
 855     pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
 856     if (pkctx == NULL)
 857         return 0;
 858     if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
 859         return -1;
 860     nid = OBJ_obj2nid(cmsalg->algorithm);
 861     if (nid == NID_rsaEncryption)
 862         return 1;
 863     if (nid != NID_rsaesOaep) {
 864         RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_ENCRYPTION_TYPE);
 865         return -1;
 866     }
 867     /* Decode OAEP parameters */
 868     oaep = rsa_oaep_decode(cmsalg);
 869
 870     if (oaep == NULL) {
 871         RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_OAEP_PARAMETERS);
 872         goto err;
 873     }
 874
 875     mgf1md = rsa_algor_to_md(oaep->maskHash);
 876     if (mgf1md == NULL)
 877         goto err;
 878     md = rsa_algor_to_md(oaep->hashFunc);
 879     if (md == NULL)
 880         goto err;
 881
 882     if (oaep->pSourceFunc != NULL) {
 883         X509_ALGOR *plab = oaep->pSourceFunc;
 884
 885         if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
 886             RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_LABEL_SOURCE);
 887             goto err;
 888         }
 889         if (plab->parameter->type != V_ASN1_OCTET_STRING) {
 890             RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_LABEL);
 891             goto err;
 892         }
 893
 894         label = plab->parameter->value.octet_string->data;
 895         /* Stop label being freed when OAEP parameters are freed */
 896         plab->parameter->value.octet_string->data = NULL;
 897         labellen = plab->parameter->value.octet_string->length;
 898     }
 899
 900     if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
 901         goto err;
 902     if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
 903         goto err;
 904     if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
 905         goto err;
 906     if (EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
 907         goto err;
 908     /* Carry on */
 909     rv = 1;
 910
 911  err:
 912     RSA_OAEP_PARAMS_free(oaep);
 913     return rv;
 914 }
 915
 916 static int rsa_cms_encrypt(CMS_RecipientInfo *ri)
 917 {
 918     const EVP_MD *md, *mgf1md;
 919     RSA_OAEP_PARAMS *oaep = NULL;
 920     ASN1_STRING *os = NULL;
 921     X509_ALGOR *alg;
 922     EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
 923     int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen;
 924     unsigned char *label;
 925
 926     CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg);
 927     if (pkctx) {
 928         if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
 929             return 0;
 930     }
 931     if (pad_mode == RSA_PKCS1_PADDING) {
 932         X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
 933         return 1;
 934     }
 935     /* Not supported */
 936     if (pad_mode != RSA_PKCS1_OAEP_PADDING)
 937         return 0;
 938     if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0)
 939         goto err;
 940     if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
 941         goto err;
 942     labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label);
 943     if (labellen < 0)
 944         goto err;
 945     oaep = RSA_OAEP_PARAMS_new();
 946     if (oaep == NULL)
 947         goto err;
 948     if (!rsa_md_to_algor(&oaep->hashFunc, md))
 949         goto err;
 950     if (!rsa_md_to_mgf1(&oaep->maskGenFunc, mgf1md))
 951         goto err;
 952     if (labellen > 0) {
 953         ASN1_OCTET_STRING *los;
 954         oaep->pSourceFunc = X509_ALGOR_new();
 955         if (oaep->pSourceFunc == NULL)
 956             goto err;
 957         los = ASN1_OCTET_STRING_new();
 958         if (los == NULL)
 959             goto err;
 960         if (!ASN1_OCTET_STRING_set(los, label, labellen)) {
 961             ASN1_OCTET_STRING_free(los);
 962             goto err;
 963         }
 964         X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified),
 965                         V_ASN1_OCTET_STRING, los);
 966     }
 967     /* create string with pss parameter encoding. */
 968     if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os))
 969          goto err;
 970     X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os);
 971     os = NULL;
 972     rv = 1;
 973  err:
 974     RSA_OAEP_PARAMS_free(oaep);
 975     ASN1_STRING_free(os);
 976     return rv;
 977 }
 978 #endif
 979
 980 const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[2] = {
 981     {
 982      EVP_PKEY_RSA,
 983      EVP_PKEY_RSA,
 984      ASN1_PKEY_SIGPARAM_NULL,
 985
 986      "RSA",
 987      "OpenSSL RSA method",
 988
 989      rsa_pub_decode,
 990      rsa_pub_encode,
 991      rsa_pub_cmp,
 992      rsa_pub_print,
 993
 994      rsa_priv_decode,
 995      rsa_priv_encode,
 996      rsa_priv_print,
 997
 998      int_rsa_size,
 999      rsa_bits,
1000      rsa_security_bits,
1001
1002      0, 0, 0, 0, 0, 0,
1003
1004      rsa_sig_print,
1005      int_rsa_free,
1006      rsa_pkey_ctrl,
1007      old_rsa_priv_decode,
1008      old_rsa_priv_encode,
1009      rsa_item_verify,
1010      rsa_item_sign,
1011      rsa_sig_info_set
1012     },
1013
1014     {
1015      EVP_PKEY_RSA2,
1016      EVP_PKEY_RSA,
1017      ASN1_PKEY_ALIAS}
1018 };
1019
1020 const EVP_PKEY_ASN1_METHOD rsa_pss_asn1_meth = {
1021      EVP_PKEY_RSA_PSS,
1022      EVP_PKEY_RSA_PSS,
1023      ASN1_PKEY_SIGPARAM_NULL,
1024
1025      "RSA-PSS",
1026      "OpenSSL RSA-PSS method",
1027
1028      rsa_pub_decode,
1029      rsa_pub_encode,
1030      rsa_pub_cmp,
1031      rsa_pub_print,
1032
1033      rsa_priv_decode,
1034      rsa_priv_encode,
1035      rsa_priv_print,
1036
1037      int_rsa_size,
1038      rsa_bits,
1039      rsa_security_bits,
1040
1041      0, 0, 0, 0, 0, 0,
1042
1043      rsa_sig_print,
1044      int_rsa_free,
1045      rsa_pkey_ctrl,
1046      0, 0,
1047      rsa_item_verify,
1048      rsa_item_sign,
1049 };