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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include "tls/s2n_ecc_preferences.h"
#include "api/s2n.h"
#include "crypto/s2n_ecc_evp.h"
#include "tls/s2n_connection.h"
#include "utils/s2n_safety.h"
const struct s2n_ecc_named_curve *const s2n_ecc_pref_list_20140601[] = {
&s2n_ecc_curve_secp256r1,
&s2n_ecc_curve_secp384r1,
};
const struct s2n_ecc_named_curve *const s2n_ecc_pref_list_20200310[] = {
#if EVP_APIS_SUPPORTED
&s2n_ecc_curve_x25519,
#endif
&s2n_ecc_curve_secp256r1,
&s2n_ecc_curve_secp384r1,
};
/* Curve p256 is at the top of the list in order to minimize HRR */
const struct s2n_ecc_named_curve *const s2n_ecc_pref_list_20230623[] = {
&s2n_ecc_curve_secp256r1,
#if EVP_APIS_SUPPORTED
&s2n_ecc_curve_x25519,
#endif
&s2n_ecc_curve_secp384r1,
};
/*
* These curves were chosen based on the following specification:
* https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-52r2.pdf
*/
const struct s2n_ecc_named_curve *const s2n_ecc_pref_list_default_fips[] = {
&s2n_ecc_curve_secp256r1,
&s2n_ecc_curve_secp384r1,
};
const struct s2n_ecc_named_curve *const s2n_ecc_pref_list_20201021[] = {
&s2n_ecc_curve_secp256r1,
&s2n_ecc_curve_secp384r1,
&s2n_ecc_curve_secp521r1,
};
const struct s2n_ecc_named_curve *const s2n_ecc_pref_list_20210816[] = {
&s2n_ecc_curve_secp384r1,
};
const struct s2n_ecc_named_curve *const s2n_ecc_pref_list_test_all[] = {
#if EVP_APIS_SUPPORTED
&s2n_ecc_curve_x25519,
#endif
&s2n_ecc_curve_secp256r1,
&s2n_ecc_curve_secp384r1,
&s2n_ecc_curve_secp521r1,
};
const struct s2n_ecc_preferences s2n_ecc_preferences_20140601 = {
.count = s2n_array_len(s2n_ecc_pref_list_20140601),
.ecc_curves = s2n_ecc_pref_list_20140601,
};
const struct s2n_ecc_preferences s2n_ecc_preferences_20200310 = {
.count = s2n_array_len(s2n_ecc_pref_list_20200310),
.ecc_curves = s2n_ecc_pref_list_20200310,
};
const struct s2n_ecc_preferences s2n_ecc_preferences_20230623 = {
.count = s2n_array_len(s2n_ecc_pref_list_20230623),
.ecc_curves = s2n_ecc_pref_list_20230623,
};
const struct s2n_ecc_preferences s2n_ecc_preferences_default_fips = {
.count = s2n_array_len(s2n_ecc_pref_list_default_fips),
.ecc_curves = s2n_ecc_pref_list_default_fips,
};
const struct s2n_ecc_preferences s2n_ecc_preferences_20201021 = {
.count = s2n_array_len(s2n_ecc_pref_list_20201021),
.ecc_curves = s2n_ecc_pref_list_20201021,
};
const struct s2n_ecc_preferences s2n_ecc_preferences_20210816 = {
.count = s2n_array_len(s2n_ecc_pref_list_20210816),
.ecc_curves = s2n_ecc_pref_list_20210816,
};
const struct s2n_ecc_preferences s2n_ecc_preferences_test_all = {
.count = s2n_array_len(s2n_ecc_pref_list_test_all),
.ecc_curves = s2n_ecc_pref_list_test_all,
};
const struct s2n_ecc_preferences s2n_ecc_preferences_null = {
.count = 0,
.ecc_curves = NULL,
};
/* Checks if the ecc_curves present in s2n_ecc_preferences list is a subset of s2n_all_supported_curves_list
* maintained in s2n_ecc_evp.c */
int s2n_check_ecc_preferences_curves_list(const struct s2n_ecc_preferences *ecc_preferences)
{
int check = 1;
for (int i = 0; i < ecc_preferences->count; i++) {
const struct s2n_ecc_named_curve *named_curve = ecc_preferences->ecc_curves[i];
int curve_found = 0;
for (size_t j = 0; j < s2n_all_supported_curves_list_len; j++) {
if (named_curve->iana_id == s2n_all_supported_curves_list[j]->iana_id) {
curve_found = 1;
break;
}
}
check *= curve_found;
if (check == 0) {
POSIX_BAIL(S2N_ERR_ECDHE_UNSUPPORTED_CURVE);
}
}
return S2N_SUCCESS;
}
/* Determines if query_iana_id corresponds to a curve for these ECC preferences. */
bool s2n_ecc_preferences_includes_curve(const struct s2n_ecc_preferences *ecc_preferences, uint16_t query_iana_id)
{
if (ecc_preferences == NULL) {
return false;
}
for (size_t i = 0; i < ecc_preferences->count; i++) {
if (query_iana_id == ecc_preferences->ecc_curves[i]->iana_id) {
return true;
}
}
return false;
}
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