2 * Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
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
11 #include <openssl/core_names.h>
12 #include <openssl/params.h>
13 #include <openssl/evp.h>
14 #include "internal/sizes.h"
15 #include "internal/param_build_set.h"
16 #include "crypto/rsa.h"
18 #include "e_os.h" /* strcasecmp for Windows() */
21 * The intention with the "backend" source file is to offer backend support
22 * for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
23 * implementations alike.
26 DEFINE_STACK_OF(BIGNUM)
28 static int collect_numbers(STACK_OF(BIGNUM) *numbers,
29 const OSSL_PARAM params[], const char *names[])
31 const OSSL_PARAM *p = NULL;
37 for (i = 0; names[i] != NULL; i++){
38 p = OSSL_PARAM_locate_const(params, names[i]);
42 if (!OSSL_PARAM_get_BN(p, &tmp)
43 || sk_BIGNUM_push(numbers, tmp) == 0)
51 int rsa_fromdata(RSA *rsa, const OSSL_PARAM params[])
53 const OSSL_PARAM *param_n, *param_e, *param_d;
54 BIGNUM *n = NULL, *e = NULL, *d = NULL;
55 STACK_OF(BIGNUM) *factors = NULL, *exps = NULL, *coeffs = NULL;
61 param_n = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_N);
62 param_e = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_E);
63 param_d = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_D);
65 if ((param_n != NULL && !OSSL_PARAM_get_BN(param_n, &n))
66 || (param_e != NULL && !OSSL_PARAM_get_BN(param_e, &e))
67 || (param_d != NULL && !OSSL_PARAM_get_BN(param_d, &d)))
70 is_private = (d != NULL);
72 if (!RSA_set0_key(rsa, n, e, d))
77 if (!collect_numbers(factors = sk_BIGNUM_new_null(), params,
79 || !collect_numbers(exps = sk_BIGNUM_new_null(), params,
81 || !collect_numbers(coeffs = sk_BIGNUM_new_null(), params,
85 /* It's ok if this private key just has n, e and d */
86 if (sk_BIGNUM_num(factors) != 0
87 && !rsa_set0_all_params(rsa, factors, exps, coeffs))
92 sk_BIGNUM_free(factors);
94 sk_BIGNUM_free(coeffs);
101 sk_BIGNUM_pop_free(factors, BN_free);
102 sk_BIGNUM_pop_free(exps, BN_free);
103 sk_BIGNUM_pop_free(coeffs, BN_free);
107 DEFINE_SPECIAL_STACK_OF_CONST(BIGNUM_const, BIGNUM)
109 int rsa_todata(RSA *rsa, OSSL_PARAM_BLD *bld, OSSL_PARAM params[])
112 const BIGNUM *rsa_d = NULL, *rsa_n = NULL, *rsa_e = NULL;
113 STACK_OF(BIGNUM_const) *factors = sk_BIGNUM_const_new_null();
114 STACK_OF(BIGNUM_const) *exps = sk_BIGNUM_const_new_null();
115 STACK_OF(BIGNUM_const) *coeffs = sk_BIGNUM_const_new_null();
117 if (rsa == NULL || factors == NULL || exps == NULL || coeffs == NULL)
120 RSA_get0_key(rsa, &rsa_n, &rsa_e, &rsa_d);
121 rsa_get0_all_params(rsa, factors, exps, coeffs);
123 /* Check private key data integrity */
125 int numprimes = sk_BIGNUM_const_num(factors);
126 int numexps = sk_BIGNUM_const_num(exps);
127 int numcoeffs = sk_BIGNUM_const_num(coeffs);
130 * It's permissible to have zero primes, i.e. no CRT params.
131 * Otherwise, there must be at least two, as many exponents,
132 * and one coefficient less.
135 && (numprimes < 2 || numexps < 2 || numcoeffs < 1))
139 if (!ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_RSA_N, rsa_n)
140 || !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_RSA_E, rsa_e)
141 || !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_RSA_D, rsa_d)
142 || !ossl_param_build_set_multi_key_bn(bld, params, rsa_mp_factor_names,
144 || !ossl_param_build_set_multi_key_bn(bld, params, rsa_mp_exp_names,
146 || !ossl_param_build_set_multi_key_bn(bld, params, rsa_mp_coeff_names,
149 #if defined(FIPS_MODULE) && !defined(OPENSSL_NO_ACVP_TESTS)
150 /* The acvp test results are not meant for export so check for bld == NULL */
152 rsa_acvp_test_get_params(rsa, params);
156 sk_BIGNUM_const_free(factors);
157 sk_BIGNUM_const_free(exps);
158 sk_BIGNUM_const_free(coeffs);
162 int rsa_pss_params_30_todata(const RSA_PSS_PARAMS_30 *pss, const char *propq,
163 OSSL_PARAM_BLD *bld, OSSL_PARAM params[])
165 if (!rsa_pss_params_30_is_unrestricted(pss)) {
166 int hashalg_nid = rsa_pss_params_30_hashalg(pss);
167 int maskgenalg_nid = rsa_pss_params_30_maskgenalg(pss);
168 int maskgenhashalg_nid = rsa_pss_params_30_maskgenhashalg(pss);
169 int saltlen = rsa_pss_params_30_saltlen(pss);
170 int default_hashalg_nid = rsa_pss_params_30_hashalg(NULL);
171 int default_maskgenalg_nid = rsa_pss_params_30_maskgenalg(NULL);
172 int default_maskgenhashalg_nid = rsa_pss_params_30_maskgenhashalg(NULL);
174 (hashalg_nid == default_hashalg_nid
175 ? NULL : rsa_oaeppss_nid2name(hashalg_nid));
176 const char *mgfname =
177 (maskgenalg_nid == default_maskgenalg_nid
178 ? NULL : rsa_oaeppss_nid2name(maskgenalg_nid));
179 const char *mgf1mdname =
180 (maskgenhashalg_nid == default_maskgenhashalg_nid
181 ? NULL : rsa_oaeppss_nid2name(maskgenhashalg_nid));
182 const char *key_md = OSSL_PKEY_PARAM_RSA_DIGEST;
183 const char *key_mgf = OSSL_PKEY_PARAM_RSA_MASKGENFUNC;
184 const char *key_mgf1_md = OSSL_PKEY_PARAM_RSA_MGF1_DIGEST;
185 const char *key_saltlen = OSSL_PKEY_PARAM_RSA_PSS_SALTLEN;
188 * To ensure that the key isn't seen as unrestricted by the recipient,
189 * we make sure that at least one PSS-related parameter is passed, even
190 * if it has a default value; saltlen.
193 && !ossl_param_build_set_utf8_string(bld, params, key_md, mdname))
195 && !ossl_param_build_set_utf8_string(bld, params,
197 || (mgf1mdname != NULL
198 && !ossl_param_build_set_utf8_string(bld, params,
199 key_mgf1_md, mgf1mdname))
200 || (!ossl_param_build_set_int(bld, params, key_saltlen, saltlen)))
206 int rsa_pss_params_30_fromdata(RSA_PSS_PARAMS_30 *pss_params,
207 const OSSL_PARAM params[], OPENSSL_CTX *libctx)
209 const OSSL_PARAM *param_md, *param_mgf, *param_mgf1md, *param_saltlen;
210 EVP_MD *md = NULL, *mgf1md = NULL;
214 if (pss_params == NULL)
218 OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_DIGEST);
220 OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_MASKGENFUNC);
222 OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_MGF1_DIGEST);
224 OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_PSS_SALTLEN);
227 * If we get any of the parameters, we know we have at least some
228 * restrictions, so we start by setting default values, and let each
229 * parameter override their specific restriction data.
231 if (param_md != NULL || param_mgf != NULL || param_mgf1md != NULL
232 || param_saltlen != NULL)
233 if (!rsa_pss_params_30_set_defaults(pss_params))
236 if (param_mgf != NULL) {
237 int default_maskgenalg_nid = rsa_pss_params_30_maskgenalg(NULL);
238 const char *mgfname = NULL;
240 if (param_mgf->data_type == OSSL_PARAM_UTF8_STRING)
241 mgfname = param_mgf->data;
242 else if (!OSSL_PARAM_get_utf8_ptr(param_mgf, &mgfname))
245 /* TODO Revisit this if / when a new MGF algorithm appears */
246 if (strcasecmp(param_mgf->data,
247 rsa_mgf_nid2name(default_maskgenalg_nid)) != 0)
252 * We're only interested in the NIDs that correspond to the MDs, so the
253 * exact propquery is unimportant in the EVP_MD_fetch() calls below.
256 if (param_md != NULL) {
257 const char *mdname = NULL;
259 if (param_md->data_type == OSSL_PARAM_UTF8_STRING)
260 mdname = param_md->data;
261 else if (!OSSL_PARAM_get_utf8_ptr(param_mgf, &mdname))
264 if ((md = EVP_MD_fetch(libctx, mdname, NULL)) == NULL
265 || !rsa_pss_params_30_set_hashalg(pss_params,
266 rsa_oaeppss_md2nid(md)))
270 if (param_mgf1md != NULL) {
271 const char *mgf1mdname = NULL;
273 if (param_mgf1md->data_type == OSSL_PARAM_UTF8_STRING)
274 mgf1mdname = param_mgf1md->data;
275 else if (!OSSL_PARAM_get_utf8_ptr(param_mgf, &mgf1mdname))
278 if ((mgf1md = EVP_MD_fetch(libctx, mgf1mdname, NULL)) == NULL
279 || !rsa_pss_params_30_set_maskgenhashalg(pss_params,
280 rsa_oaeppss_md2nid(mgf1md)))
284 if (param_saltlen != NULL) {
285 if (!OSSL_PARAM_get_int(param_saltlen, &saltlen)
286 || !rsa_pss_params_30_set_saltlen(pss_params, saltlen))