crypto/rsa/rsa_backend.c

   1 /*
   2  * Copyright 2020-2022 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 <string.h>
  17 #include <openssl/core_names.h>
  18 #include <openssl/params.h>
  19 #include <openssl/err.h>
  20 #include <openssl/evp.h>
  21 #ifndef FIPS_MODULE
  22 # include <openssl/x509.h>
  23 # include "crypto/asn1.h"
  24 #endif
  25 #include "internal/sizes.h"
  26 #include "internal/param_build_set.h"
  27 #include "crypto/rsa.h"
  28 #include "rsa_local.h"
  29
  30 /*
  31  * The intention with the "backend" source file is to offer backend support
  32  * for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
  33  * implementations alike.
  34  */
  35
  36 DEFINE_STACK_OF(BIGNUM)
  37
  38 static int collect_numbers(STACK_OF(BIGNUM) *numbers,
  39                            const OSSL_PARAM params[], const char *names[])
  40 {
  41     const OSSL_PARAM *p = NULL;
  42     int i;
  43
  44     if (numbers == NULL)
  45         return 0;
  46
  47     for (i = 0; names[i] != NULL; i++) {
  48         p = OSSL_PARAM_locate_const(params, names[i]);
  49         if (p != NULL) {
  50             BIGNUM *tmp = NULL;
  51
  52             if (!OSSL_PARAM_get_BN(p, &tmp))
  53                 return 0;
  54             if (sk_BIGNUM_push(numbers, tmp) == 0) {
  55                 BN_clear_free(tmp);
  56                 return 0;
  57             }
  58         }
  59     }
  60
  61     return 1;
  62 }
  63
  64 int ossl_rsa_fromdata(RSA *rsa, const OSSL_PARAM params[], int include_private)
  65 {
  66     const OSSL_PARAM *param_n, *param_e,  *param_d = NULL;
  67     BIGNUM *n = NULL, *e = NULL, *d = NULL;
  68     STACK_OF(BIGNUM) *factors = NULL, *exps = NULL, *coeffs = NULL;
  69     int is_private = 0;
  70
  71     if (rsa == NULL)
  72         return 0;
  73
  74     param_n = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_N);
  75     param_e = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_E);
  76     if (include_private)
  77         param_d = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_D);
  78
  79     if ((param_n != NULL && !OSSL_PARAM_get_BN(param_n, &n))
  80         || (param_e != NULL && !OSSL_PARAM_get_BN(param_e, &e))
  81         || (param_d != NULL && !OSSL_PARAM_get_BN(param_d, &d)))
  82         goto err;
  83
  84     is_private = (d != NULL);
  85
  86     if (!RSA_set0_key(rsa, n, e, d))
  87         goto err;
  88     n = e = d = NULL;
  89
  90     if (is_private) {
  91         if (!collect_numbers(factors = sk_BIGNUM_new_null(), params,
  92                              ossl_rsa_mp_factor_names)
  93             || !collect_numbers(exps = sk_BIGNUM_new_null(), params,
  94                                 ossl_rsa_mp_exp_names)
  95             || !collect_numbers(coeffs = sk_BIGNUM_new_null(), params,
  96                                 ossl_rsa_mp_coeff_names))
  97             goto err;
  98
  99         /* It's ok if this private key just has n, e and d */
 100         if (sk_BIGNUM_num(factors) != 0
 101             && !ossl_rsa_set0_all_params(rsa, factors, exps, coeffs))
 102             goto err;
 103     }
 104
 105
 106     sk_BIGNUM_free(factors);
 107     sk_BIGNUM_free(exps);
 108     sk_BIGNUM_free(coeffs);
 109     return 1;
 110
 111  err:
 112     BN_free(n);
 113     BN_free(e);
 114     BN_free(d);
 115     sk_BIGNUM_pop_free(factors, BN_free);
 116     sk_BIGNUM_pop_free(exps, BN_free);
 117     sk_BIGNUM_pop_free(coeffs, BN_free);
 118     return 0;
 119 }
 120
 121 DEFINE_SPECIAL_STACK_OF_CONST(BIGNUM_const, BIGNUM)
 122
 123 int ossl_rsa_todata(RSA *rsa, OSSL_PARAM_BLD *bld, OSSL_PARAM params[],
 124                     int include_private)
 125 {
 126     int ret = 0;
 127     const BIGNUM *rsa_d = NULL, *rsa_n = NULL, *rsa_e = NULL;
 128     STACK_OF(BIGNUM_const) *factors = sk_BIGNUM_const_new_null();
 129     STACK_OF(BIGNUM_const) *exps = sk_BIGNUM_const_new_null();
 130     STACK_OF(BIGNUM_const) *coeffs = sk_BIGNUM_const_new_null();
 131
 132     if (rsa == NULL || factors == NULL || exps == NULL || coeffs == NULL)
 133         goto err;
 134
 135     RSA_get0_key(rsa, &rsa_n, &rsa_e, &rsa_d);
 136     ossl_rsa_get0_all_params(rsa, factors, exps, coeffs);
 137
 138     if (!ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_RSA_N, rsa_n)
 139         || !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_RSA_E, rsa_e))
 140         goto err;
 141
 142     /* Check private key data integrity */
 143     if (include_private && rsa_d != NULL) {
 144         int numprimes = sk_BIGNUM_const_num(factors);
 145         int numexps = sk_BIGNUM_const_num(exps);
 146         int numcoeffs = sk_BIGNUM_const_num(coeffs);
 147
 148         /*
 149          * It's permissible to have zero primes, i.e. no CRT params.
 150          * Otherwise, there must be at least two, as many exponents,
 151          * and one coefficient less.
 152          */
 153         if (numprimes != 0
 154             && (numprimes < 2 || numexps < 2 || numcoeffs < 1))
 155             goto err;
 156
 157         if (!ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_RSA_D,
 158                                      rsa_d)
 159             || !ossl_param_build_set_multi_key_bn(bld, params,
 160                                                   ossl_rsa_mp_factor_names,
 161                                                   factors)
 162             || !ossl_param_build_set_multi_key_bn(bld, params,
 163                                                   ossl_rsa_mp_exp_names, exps)
 164             || !ossl_param_build_set_multi_key_bn(bld, params,
 165                                                   ossl_rsa_mp_coeff_names,
 166                                                   coeffs))
 167         goto err;
 168     }
 169
 170 #if defined(FIPS_MODULE) && !defined(OPENSSL_NO_ACVP_TESTS)
 171     /* The acvp test results are not meant for export so check for bld == NULL */
 172     if (bld == NULL)
 173         ossl_rsa_acvp_test_get_params(rsa, params);
 174 #endif
 175     ret = 1;
 176  err:
 177     sk_BIGNUM_const_free(factors);
 178     sk_BIGNUM_const_free(exps);
 179     sk_BIGNUM_const_free(coeffs);
 180     return ret;
 181 }
 182
 183 int ossl_rsa_pss_params_30_todata(const RSA_PSS_PARAMS_30 *pss,
 184                                   OSSL_PARAM_BLD *bld, OSSL_PARAM params[])
 185 {
 186     if (!ossl_rsa_pss_params_30_is_unrestricted(pss)) {
 187         int hashalg_nid = ossl_rsa_pss_params_30_hashalg(pss);
 188         int maskgenalg_nid = ossl_rsa_pss_params_30_maskgenalg(pss);
 189         int maskgenhashalg_nid = ossl_rsa_pss_params_30_maskgenhashalg(pss);
 190         int saltlen = ossl_rsa_pss_params_30_saltlen(pss);
 191         int default_hashalg_nid = ossl_rsa_pss_params_30_hashalg(NULL);
 192         int default_maskgenalg_nid = ossl_rsa_pss_params_30_maskgenalg(NULL);
 193         int default_maskgenhashalg_nid =
 194                 ossl_rsa_pss_params_30_maskgenhashalg(NULL);
 195         const char *mdname =
 196             (hashalg_nid == default_hashalg_nid
 197              ? NULL : ossl_rsa_oaeppss_nid2name(hashalg_nid));
 198         const char *mgfname =
 199             (maskgenalg_nid == default_maskgenalg_nid
 200              ? NULL : ossl_rsa_oaeppss_nid2name(maskgenalg_nid));
 201         const char *mgf1mdname =
 202             (maskgenhashalg_nid == default_maskgenhashalg_nid
 203              ? NULL : ossl_rsa_oaeppss_nid2name(maskgenhashalg_nid));
 204         const char *key_md = OSSL_PKEY_PARAM_RSA_DIGEST;
 205         const char *key_mgf = OSSL_PKEY_PARAM_RSA_MASKGENFUNC;
 206         const char *key_mgf1_md = OSSL_PKEY_PARAM_RSA_MGF1_DIGEST;
 207         const char *key_saltlen = OSSL_PKEY_PARAM_RSA_PSS_SALTLEN;
 208
 209         /*
 210          * To ensure that the key isn't seen as unrestricted by the recipient,
 211          * we make sure that at least one PSS-related parameter is passed, even
 212          * if it has a default value; saltlen.
 213          */
 214         if ((mdname != NULL
 215              && !ossl_param_build_set_utf8_string(bld, params, key_md, mdname))
 216             || (mgfname != NULL
 217                 && !ossl_param_build_set_utf8_string(bld, params,
 218                                                      key_mgf, mgfname))
 219             || (mgf1mdname != NULL
 220                 && !ossl_param_build_set_utf8_string(bld, params,
 221                                                      key_mgf1_md, mgf1mdname))
 222             || (!ossl_param_build_set_int(bld, params, key_saltlen, saltlen)))
 223             return 0;
 224     }
 225     return 1;
 226 }
 227
 228 int ossl_rsa_pss_params_30_fromdata(RSA_PSS_PARAMS_30 *pss_params,
 229                                     int *defaults_set,
 230                                     const OSSL_PARAM params[],
 231                                     OSSL_LIB_CTX *libctx)
 232 {
 233     const OSSL_PARAM *param_md, *param_mgf, *param_mgf1md,  *param_saltlen;
 234     const OSSL_PARAM *param_propq;
 235     const char *propq = NULL;
 236     EVP_MD *md = NULL, *mgf1md = NULL;
 237     int saltlen;
 238     int ret = 0;
 239
 240     if (pss_params == NULL)
 241         return 0;
 242     param_propq =
 243         OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_DIGEST_PROPS);
 244     param_md =
 245         OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_DIGEST);
 246     param_mgf =
 247         OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_MASKGENFUNC);
 248     param_mgf1md =
 249         OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_MGF1_DIGEST);
 250     param_saltlen =
 251         OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_PSS_SALTLEN);
 252
 253     if (param_propq != NULL) {
 254         if (param_propq->data_type == OSSL_PARAM_UTF8_STRING)
 255             propq = param_propq->data;
 256     }
 257     /*
 258      * If we get any of the parameters, we know we have at least some
 259      * restrictions, so we start by setting default values, and let each
 260      * parameter override their specific restriction data.
 261      */
 262     if (!*defaults_set
 263         && (param_md != NULL || param_mgf != NULL || param_mgf1md != NULL
 264             || param_saltlen != NULL)) {
 265         if (!ossl_rsa_pss_params_30_set_defaults(pss_params))
 266             return 0;
 267         *defaults_set = 1;
 268     }
 269
 270     if (param_mgf != NULL) {
 271         int default_maskgenalg_nid = ossl_rsa_pss_params_30_maskgenalg(NULL);
 272         const char *mgfname = NULL;
 273
 274         if (param_mgf->data_type == OSSL_PARAM_UTF8_STRING)
 275             mgfname = param_mgf->data;
 276         else if (!OSSL_PARAM_get_utf8_ptr(param_mgf, &mgfname))
 277             return 0;
 278
 279         if (OPENSSL_strcasecmp(param_mgf->data,
 280                                ossl_rsa_mgf_nid2name(default_maskgenalg_nid)) != 0)
 281             return 0;
 282     }
 283
 284     /*
 285      * We're only interested in the NIDs that correspond to the MDs, so the
 286      * exact propquery is unimportant in the EVP_MD_fetch() calls below.
 287      */
 288
 289     if (param_md != NULL) {
 290         const char *mdname = NULL;
 291
 292         if (param_md->data_type == OSSL_PARAM_UTF8_STRING)
 293             mdname = param_md->data;
 294         else if (!OSSL_PARAM_get_utf8_ptr(param_mgf, &mdname))
 295             goto err;
 296
 297         if ((md = EVP_MD_fetch(libctx, mdname, propq)) == NULL
 298             || !ossl_rsa_pss_params_30_set_hashalg(pss_params,
 299                                                    ossl_rsa_oaeppss_md2nid(md)))
 300             goto err;
 301     }
 302
 303     if (param_mgf1md != NULL) {
 304         const char *mgf1mdname = NULL;
 305
 306         if (param_mgf1md->data_type == OSSL_PARAM_UTF8_STRING)
 307             mgf1mdname = param_mgf1md->data;
 308         else if (!OSSL_PARAM_get_utf8_ptr(param_mgf, &mgf1mdname))
 309             goto err;
 310
 311         if ((mgf1md = EVP_MD_fetch(libctx, mgf1mdname, propq)) == NULL
 312             || !ossl_rsa_pss_params_30_set_maskgenhashalg(
 313                     pss_params, ossl_rsa_oaeppss_md2nid(mgf1md)))
 314             goto err;
 315     }
 316
 317     if (param_saltlen != NULL) {
 318         if (!OSSL_PARAM_get_int(param_saltlen, &saltlen)
 319             || !ossl_rsa_pss_params_30_set_saltlen(pss_params, saltlen))
 320             goto err;
 321     }
 322
 323     ret = 1;
 324
 325  err:
 326     EVP_MD_free(md);
 327     EVP_MD_free(mgf1md);
 328     return ret;
 329 }
 330
 331 int ossl_rsa_is_foreign(const RSA *rsa)
 332 {
 333 #ifndef FIPS_MODULE
 334     if (rsa->engine != NULL || RSA_get_method(rsa) != RSA_PKCS1_OpenSSL())
 335         return 1;
 336 #endif
 337     return 0;
 338 }
 339
 340 static ossl_inline int rsa_bn_dup_check(BIGNUM **out, const BIGNUM *f)
 341 {
 342     if (f != NULL && (*out = BN_dup(f)) == NULL)
 343         return 0;
 344     return 1;
 345 }
 346
 347 RSA *ossl_rsa_dup(const RSA *rsa, int selection)
 348 {
 349     RSA *dupkey = NULL;
 350 #ifndef FIPS_MODULE
 351     int pnum, i;
 352 #endif
 353
 354     /* Do not try to duplicate foreign RSA keys */
 355     if (ossl_rsa_is_foreign(rsa))
 356         return NULL;
 357
 358     if ((dupkey = ossl_rsa_new_with_ctx(rsa->libctx)) == NULL)
 359         return NULL;
 360
 361     /* public key */
 362     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 363         if (!rsa_bn_dup_check(&dupkey->n, rsa->n))
 364             goto err;
 365         if (!rsa_bn_dup_check(&dupkey->e, rsa->e))
 366             goto err;
 367     }
 368
 369     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {
 370
 371         /* private key */
 372         if (!rsa_bn_dup_check(&dupkey->d, rsa->d))
 373             goto err;
 374
 375         /* factors and crt params */
 376         if (!rsa_bn_dup_check(&dupkey->p, rsa->p))
 377             goto err;
 378         if (!rsa_bn_dup_check(&dupkey->q, rsa->q))
 379             goto err;
 380         if (!rsa_bn_dup_check(&dupkey->dmp1, rsa->dmp1))
 381             goto err;
 382         if (!rsa_bn_dup_check(&dupkey->dmq1, rsa->dmq1))
 383             goto err;
 384         if (!rsa_bn_dup_check(&dupkey->iqmp, rsa->iqmp))
 385             goto err;
 386     }
 387
 388     dupkey->version = rsa->version;
 389     dupkey->flags = rsa->flags;
 390     /* we always copy the PSS parameters regardless of selection */
 391     dupkey->pss_params = rsa->pss_params;
 392
 393 #ifndef FIPS_MODULE
 394     /* multiprime */
 395     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0
 396         && (pnum = sk_RSA_PRIME_INFO_num(rsa->prime_infos)) > 0) {
 397         dupkey->prime_infos = sk_RSA_PRIME_INFO_new_reserve(NULL, pnum);
 398         if (dupkey->prime_infos == NULL)
 399             goto err;
 400         for (i = 0; i < pnum; i++) {
 401             const RSA_PRIME_INFO *pinfo = NULL;
 402             RSA_PRIME_INFO *duppinfo = NULL;
 403
 404             if ((duppinfo = OPENSSL_zalloc(sizeof(*duppinfo))) == NULL)
 405                 goto err;
 406             /* push first so cleanup in error case works */
 407             (void)sk_RSA_PRIME_INFO_push(dupkey->prime_infos, duppinfo);
 408
 409             pinfo = sk_RSA_PRIME_INFO_value(rsa->prime_infos, i);
 410             if (!rsa_bn_dup_check(&duppinfo->r, pinfo->r))
 411                 goto err;
 412             if (!rsa_bn_dup_check(&duppinfo->d, pinfo->d))
 413                 goto err;
 414             if (!rsa_bn_dup_check(&duppinfo->t, pinfo->t))
 415                 goto err;
 416         }
 417         if (!ossl_rsa_multip_calc_product(dupkey))
 418             goto err;
 419     }
 420
 421     if (rsa->pss != NULL) {
 422         dupkey->pss = RSA_PSS_PARAMS_dup(rsa->pss);
 423         if (rsa->pss->maskGenAlgorithm != NULL
 424             && dupkey->pss->maskGenAlgorithm == NULL) {
 425             dupkey->pss->maskHash = ossl_x509_algor_mgf1_decode(rsa->pss->maskGenAlgorithm);
 426             if (dupkey->pss->maskHash == NULL)
 427                 goto err;
 428         }
 429     }
 430     if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_RSA,
 431                             &dupkey->ex_data, &rsa->ex_data))
 432         goto err;
 433 #endif
 434
 435     return dupkey;
 436
 437  err:
 438     RSA_free(dupkey);
 439     return NULL;
 440 }
 441
 442 #ifndef FIPS_MODULE
 443 RSA_PSS_PARAMS *ossl_rsa_pss_decode(const X509_ALGOR *alg)
 444 {
 445     RSA_PSS_PARAMS *pss;
 446
 447     pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_PSS_PARAMS),
 448                                     alg->parameter);
 449
 450     if (pss == NULL)
 451         return NULL;
 452
 453     if (pss->maskGenAlgorithm != NULL) {
 454         pss->maskHash = ossl_x509_algor_mgf1_decode(pss->maskGenAlgorithm);
 455         if (pss->maskHash == NULL) {
 456             RSA_PSS_PARAMS_free(pss);
 457             return NULL;
 458         }
 459     }
 460
 461     return pss;
 462 }
 463
 464 static int ossl_rsa_sync_to_pss_params_30(RSA *rsa)
 465 {
 466     const RSA_PSS_PARAMS *legacy_pss = NULL;
 467     RSA_PSS_PARAMS_30 *pss = NULL;
 468
 469     if (rsa != NULL
 470         && (legacy_pss = RSA_get0_pss_params(rsa)) != NULL
 471         && (pss = ossl_rsa_get0_pss_params_30(rsa)) != NULL) {
 472         const EVP_MD *md = NULL, *mgf1md = NULL;
 473         int md_nid, mgf1md_nid, saltlen, trailerField;
 474         RSA_PSS_PARAMS_30 pss_params;
 475
 476         /*
 477          * We don't care about the validity of the fields here, we just
 478          * want to synchronise values.  Verifying here makes it impossible
 479          * to even read a key with invalid values, making it hard to test
 480          * a bad situation.
 481          *
 482          * Other routines use ossl_rsa_pss_get_param(), so the values will
 483          * be checked, eventually.
 484          */
 485         if (!ossl_rsa_pss_get_param_unverified(legacy_pss, &md, &mgf1md,
 486                                                &saltlen, &trailerField))
 487             return 0;
 488         md_nid = EVP_MD_get_type(md);
 489         mgf1md_nid = EVP_MD_get_type(mgf1md);
 490         if (!ossl_rsa_pss_params_30_set_defaults(&pss_params)
 491             || !ossl_rsa_pss_params_30_set_hashalg(&pss_params, md_nid)
 492             || !ossl_rsa_pss_params_30_set_maskgenhashalg(&pss_params,
 493                                                           mgf1md_nid)
 494             || !ossl_rsa_pss_params_30_set_saltlen(&pss_params, saltlen)
 495             || !ossl_rsa_pss_params_30_set_trailerfield(&pss_params,
 496                                                         trailerField))
 497             return 0;
 498         *pss = pss_params;
 499     }
 500     return 1;
 501 }
 502
 503 int ossl_rsa_pss_get_param_unverified(const RSA_PSS_PARAMS *pss,
 504                                       const EVP_MD **pmd, const EVP_MD **pmgf1md,
 505                                       int *psaltlen, int *ptrailerField)
 506 {
 507     RSA_PSS_PARAMS_30 pss_params;
 508
 509     /* Get the defaults from the ONE place */
 510     (void)ossl_rsa_pss_params_30_set_defaults(&pss_params);
 511
 512     if (pss == NULL)
 513         return 0;
 514     *pmd = ossl_x509_algor_get_md(pss->hashAlgorithm);
 515     if (*pmd == NULL)
 516         return 0;
 517     *pmgf1md = ossl_x509_algor_get_md(pss->maskHash);
 518     if (*pmgf1md == NULL)
 519         return 0;
 520     if (pss->saltLength)
 521         *psaltlen = ASN1_INTEGER_get(pss->saltLength);
 522     else
 523         *psaltlen = ossl_rsa_pss_params_30_saltlen(&pss_params);
 524     if (pss->trailerField)
 525         *ptrailerField = ASN1_INTEGER_get(pss->trailerField);
 526     else
 527         *ptrailerField = ossl_rsa_pss_params_30_trailerfield(&pss_params);
 528
 529     return 1;
 530 }
 531
 532 int ossl_rsa_param_decode(RSA *rsa, const X509_ALGOR *alg)
 533 {
 534     RSA_PSS_PARAMS *pss;
 535     const ASN1_OBJECT *algoid;
 536     const void *algp;
 537     int algptype;
 538
 539     X509_ALGOR_get0(&algoid, &algptype, &algp, alg);
 540     if (OBJ_obj2nid(algoid) != EVP_PKEY_RSA_PSS)
 541         return 1;
 542     if (algptype == V_ASN1_UNDEF)
 543         return 1;
 544     if (algptype != V_ASN1_SEQUENCE) {
 545         ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PSS_PARAMETERS);
 546         return 0;
 547     }
 548     if ((pss = ossl_rsa_pss_decode(alg)) == NULL
 549         || !ossl_rsa_set0_pss_params(rsa, pss)) {
 550         RSA_PSS_PARAMS_free(pss);
 551         return 0;
 552     }
 553     if (!ossl_rsa_sync_to_pss_params_30(rsa))
 554         return 0;
 555     return 1;
 556 }
 557
 558 RSA *ossl_rsa_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
 559                              OSSL_LIB_CTX *libctx, const char *propq)
 560 {
 561     const unsigned char *p;
 562     RSA *rsa;
 563     int pklen;
 564     const X509_ALGOR *alg;
 565
 566     if (!PKCS8_pkey_get0(NULL, &p, &pklen, &alg, p8inf))
 567         return 0;
 568     rsa = d2i_RSAPrivateKey(NULL, &p, pklen);
 569     if (rsa == NULL) {
 570         ERR_raise(ERR_LIB_RSA, ERR_R_RSA_LIB);
 571         return NULL;
 572     }
 573     if (!ossl_rsa_param_decode(rsa, alg)) {
 574         RSA_free(rsa);
 575         return NULL;
 576     }
 577
 578     RSA_clear_flags(rsa, RSA_FLAG_TYPE_MASK);
 579     switch (OBJ_obj2nid(alg->algorithm)) {
 580     case EVP_PKEY_RSA:
 581         RSA_set_flags(rsa, RSA_FLAG_TYPE_RSA);
 582         break;
 583     case EVP_PKEY_RSA_PSS:
 584         RSA_set_flags(rsa, RSA_FLAG_TYPE_RSASSAPSS);
 585         break;
 586     default:
 587         /* Leave the type bits zero */
 588         break;
 589     }
 590
 591     return rsa;
 592 }
 593 #endif