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