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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 "api/s2n.h"
#include "crypto/s2n_hash.h"
#include "crypto/s2n_signature.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_signature_scheme.h"
#include "crypto/s2n_ecc_evp.h"
#include "utils/s2n_safety.h"
/* RSA PKCS1 */
const struct s2n_signature_scheme s2n_rsa_pkcs1_md5_sha1 = {
.iana_value = TLS_SIGNATURE_SCHEME_PRIVATE_INTERNAL_RSA_PKCS1_MD5_SHA1,
.hash_alg = S2N_HASH_MD5_SHA1,
.sig_alg = S2N_SIGNATURE_RSA,
.libcrypto_nid = NID_md5_sha1,
.signature_curve = NULL, /* Elliptic Curve not needed for RSA */
.maximum_protocol_version = S2N_TLS12, /* TLS1.3 does not support pkcs1 or sha1 */
};
const struct s2n_signature_scheme s2n_rsa_pkcs1_sha1 = {
.iana_value = TLS_SIGNATURE_SCHEME_RSA_PKCS1_SHA1,
.hash_alg = S2N_HASH_SHA1,
.sig_alg = S2N_SIGNATURE_RSA,
.libcrypto_nid = NID_sha1WithRSAEncryption,
.signature_curve = NULL, /* Elliptic Curve not needed for RSA */
.maximum_protocol_version = S2N_TLS12, /* TLS1.3 does not support pkcs1 or sha1 */
};
const struct s2n_signature_scheme s2n_rsa_pkcs1_sha224 = {
.iana_value = TLS_SIGNATURE_SCHEME_RSA_PKCS1_SHA224,
.hash_alg = S2N_HASH_SHA224,
.sig_alg = S2N_SIGNATURE_RSA,
.libcrypto_nid = NID_sha224WithRSAEncryption,
.signature_curve = NULL, /* Elliptic Curve not needed for RSA */
.maximum_protocol_version = S2N_TLS12, /* TLS1.3 does not support pkcs1 */
};
const struct s2n_signature_scheme s2n_rsa_pkcs1_sha256 = {
.iana_value = TLS_SIGNATURE_SCHEME_RSA_PKCS1_SHA256,
.hash_alg = S2N_HASH_SHA256,
.sig_alg = S2N_SIGNATURE_RSA,
.libcrypto_nid = NID_sha256WithRSAEncryption,
.signature_curve = NULL, /* Elliptic Curve not needed for RSA */
.maximum_protocol_version = S2N_TLS12, /* TLS1.3 does not support pkcs1 */
};
const struct s2n_signature_scheme s2n_rsa_pkcs1_sha384 = {
.iana_value = TLS_SIGNATURE_SCHEME_RSA_PKCS1_SHA384,
.hash_alg = S2N_HASH_SHA384,
.sig_alg = S2N_SIGNATURE_RSA,
.libcrypto_nid = NID_sha384WithRSAEncryption,
.signature_curve = NULL, /* Elliptic Curve not needed for RSA */
.maximum_protocol_version = S2N_TLS12, /* TLS1.3 does not support pkcs1 */
};
const struct s2n_signature_scheme s2n_rsa_pkcs1_sha512 = {
.iana_value = TLS_SIGNATURE_SCHEME_RSA_PKCS1_SHA512,
.hash_alg = S2N_HASH_SHA512,
.sig_alg = S2N_SIGNATURE_RSA,
.libcrypto_nid = NID_sha512WithRSAEncryption,
.signature_curve = NULL, /* Elliptic Curve not needed for RSA */
.maximum_protocol_version = S2N_TLS12, /* TLS1.3 does not support pkcs1 */
};
/* TLS 1.2 Compatible ECDSA Signature Schemes */
const struct s2n_signature_scheme s2n_ecdsa_sha1 = {
.iana_value = TLS_SIGNATURE_SCHEME_ECDSA_SHA1,
.hash_alg = S2N_HASH_SHA1,
.sig_alg = S2N_SIGNATURE_ECDSA,
.libcrypto_nid = NID_ecdsa_with_SHA1,
.signature_curve = NULL, /* Decided by supported_groups Extension in TLS 1.2 and before */
.maximum_protocol_version = S2N_TLS12, /* TLS1.3 does not support sha1 and requires a signature curve */
};
const struct s2n_signature_scheme s2n_ecdsa_sha224 = {
.iana_value = TLS_SIGNATURE_SCHEME_ECDSA_SHA224,
.hash_alg = S2N_HASH_SHA224,
.sig_alg = S2N_SIGNATURE_ECDSA,
.libcrypto_nid = NID_ecdsa_with_SHA224,
.signature_curve = NULL, /* Decided by supported_groups Extension in TLS 1.2 and before */
.maximum_protocol_version = S2N_TLS12, /* TLS1.3 requires a signature curve */
};
const struct s2n_signature_scheme s2n_ecdsa_sha256 = {
.iana_value = TLS_SIGNATURE_SCHEME_ECDSA_SHA256,
.hash_alg = S2N_HASH_SHA256,
.sig_alg = S2N_SIGNATURE_ECDSA,
.libcrypto_nid = NID_ecdsa_with_SHA256,
.signature_curve = NULL, /* Decided by supported_groups Extension in TLS 1.2 and before */
.maximum_protocol_version = S2N_TLS12, /* TLS1.3 requires a signature curve */
};
const struct s2n_signature_scheme s2n_ecdsa_sha384 = {
.iana_value = TLS_SIGNATURE_SCHEME_ECDSA_SHA384,
.hash_alg = S2N_HASH_SHA384,
.sig_alg = S2N_SIGNATURE_ECDSA,
.libcrypto_nid = NID_ecdsa_with_SHA384,
.signature_curve = NULL, /* Decided by supported_groups Extension in TLS 1.2 and before */
.maximum_protocol_version = S2N_TLS12, /* TLS1.3 requires a signature curve */
};
const struct s2n_signature_scheme s2n_ecdsa_sha512 = {
.iana_value = TLS_SIGNATURE_SCHEME_ECDSA_SHA512,
.hash_alg = S2N_HASH_SHA512,
.sig_alg = S2N_SIGNATURE_ECDSA,
.libcrypto_nid = NID_ecdsa_with_SHA512,
.signature_curve = NULL, /* Decided by supported_groups Extension in TLS 1.2 and before */
.maximum_protocol_version = S2N_TLS12, /* TLS1.3 requires a signature curve */
};
/* TLS 1.3 Compatible ECDSA Schemes */
/* In TLS 1.3 the two byte IANA value also defines the Curve to use for signing */
const struct s2n_signature_scheme s2n_ecdsa_secp256r1_sha256 = {
.iana_value = TLS_SIGNATURE_SCHEME_ECDSA_SECP256R1_SHA256,
.hash_alg = S2N_HASH_SHA256,
.sig_alg = S2N_SIGNATURE_ECDSA,
.libcrypto_nid = NID_ecdsa_with_SHA256,
.signature_curve = &s2n_ecc_curve_secp256r1, /* Hardcoded as of TLS 1.3 */
.minimum_protocol_version = S2N_TLS13,
};
const struct s2n_signature_scheme s2n_ecdsa_secp384r1_sha384 = {
.iana_value = TLS_SIGNATURE_SCHEME_ECDSA_SECP384R1_SHA384,
.hash_alg = S2N_HASH_SHA384,
.sig_alg = S2N_SIGNATURE_ECDSA,
.libcrypto_nid = NID_ecdsa_with_SHA384,
.signature_curve = &s2n_ecc_curve_secp384r1, /* Hardcoded as of TLS 1.3 */
.minimum_protocol_version = S2N_TLS13,
};
const struct s2n_signature_scheme s2n_ecdsa_secp521r1_sha512 = {
.iana_value = TLS_SIGNATURE_SCHEME_ECDSA_SECP521R1_SHA512,
.hash_alg = S2N_HASH_SHA512,
.sig_alg = S2N_SIGNATURE_ECDSA,
.signature_curve = &s2n_ecc_curve_secp521r1, /* Hardcoded as of TLS 1.3 */
.minimum_protocol_version = S2N_TLS13,
};
/**
* RSA-PSS-RSAE
*/
const struct s2n_signature_scheme s2n_rsa_pss_rsae_sha256 = {
.iana_value = TLS_SIGNATURE_SCHEME_RSA_PSS_RSAE_SHA256,
.hash_alg = S2N_HASH_SHA256,
.sig_alg = S2N_SIGNATURE_RSA_PSS_RSAE,
.libcrypto_nid = NID_rsassaPss,
.signature_curve = NULL, /* Elliptic Curve not needed for RSA */
};
const struct s2n_signature_scheme s2n_rsa_pss_rsae_sha384 = {
.iana_value = TLS_SIGNATURE_SCHEME_RSA_PSS_RSAE_SHA384,
.hash_alg = S2N_HASH_SHA384,
.sig_alg = S2N_SIGNATURE_RSA_PSS_RSAE,
.libcrypto_nid = NID_rsassaPss,
.signature_curve = NULL, /* Elliptic Curve not needed for RSA */
};
const struct s2n_signature_scheme s2n_rsa_pss_rsae_sha512 = {
.iana_value = TLS_SIGNATURE_SCHEME_RSA_PSS_RSAE_SHA512,
.hash_alg = S2N_HASH_SHA512,
.sig_alg = S2N_SIGNATURE_RSA_PSS_RSAE,
.libcrypto_nid = NID_rsassaPss,
.signature_curve = NULL, /* Elliptic Curve not needed for RSA */
};
/**
* RSA-PSS-PSS
*/
const struct s2n_signature_scheme s2n_rsa_pss_pss_sha256 = {
.iana_value = TLS_SIGNATURE_SCHEME_RSA_PSS_PSS_SHA256,
.hash_alg = S2N_HASH_SHA256,
.sig_alg = S2N_SIGNATURE_RSA_PSS_PSS,
.libcrypto_nid = NID_rsassaPss,
.signature_curve = NULL, /* Elliptic Curve not needed for RSA */
.minimum_protocol_version = S2N_TLS13,
};
const struct s2n_signature_scheme s2n_rsa_pss_pss_sha384 = {
.iana_value = TLS_SIGNATURE_SCHEME_RSA_PSS_PSS_SHA384,
.hash_alg = S2N_HASH_SHA384,
.sig_alg = S2N_SIGNATURE_RSA_PSS_PSS,
.libcrypto_nid = NID_rsassaPss,
.signature_curve = NULL, /* Elliptic Curve not needed for RSA */
.minimum_protocol_version = S2N_TLS13,
};
const struct s2n_signature_scheme s2n_rsa_pss_pss_sha512 = {
.iana_value = TLS_SIGNATURE_SCHEME_RSA_PSS_PSS_SHA512,
.hash_alg = S2N_HASH_SHA512,
.sig_alg = S2N_SIGNATURE_RSA_PSS_PSS,
.libcrypto_nid = NID_rsassaPss,
.signature_curve = NULL, /* Elliptic Curve not needed for RSA */
.minimum_protocol_version = S2N_TLS13,
};
/* All Supported SignatureSchemes. */
/* No MD5 to avoid SLOTH Vulnerability */
const struct s2n_signature_scheme* const s2n_sig_scheme_pref_list_20140601[] = {
/* RSA PKCS1 */
&s2n_rsa_pkcs1_sha256,
&s2n_rsa_pkcs1_sha384,
&s2n_rsa_pkcs1_sha512,
&s2n_rsa_pkcs1_sha224,
/* ECDSA - TLS 1.2 */
&s2n_ecdsa_sha256, /* same iana value as TLS 1.3 s2n_ecdsa_secp256r1_sha256 */
&s2n_ecdsa_secp256r1_sha256,
&s2n_ecdsa_sha384, /* same iana value as TLS 1.3 s2n_ecdsa_secp384r1_sha384 */
&s2n_ecdsa_secp384r1_sha384,
&s2n_ecdsa_sha512,
&s2n_ecdsa_sha224,
/* SHA-1 Legacy */
&s2n_rsa_pkcs1_sha1,
&s2n_ecdsa_sha1,
};
/* The original preference list, but with rsa_pss supported. */
const struct s2n_signature_scheme* const s2n_sig_scheme_pref_list_20200207[] = {
/* RSA PSS */
&s2n_rsa_pss_pss_sha256,
&s2n_rsa_pss_pss_sha384,
&s2n_rsa_pss_pss_sha512,
&s2n_rsa_pss_rsae_sha256,
&s2n_rsa_pss_rsae_sha384,
&s2n_rsa_pss_rsae_sha512,
/* RSA PKCS1 */
&s2n_rsa_pkcs1_sha256,
&s2n_rsa_pkcs1_sha384,
&s2n_rsa_pkcs1_sha512,
&s2n_rsa_pkcs1_sha224,
/* ECDSA - TLS 1.2 */
&s2n_ecdsa_sha256, /* same iana value as TLS 1.3 s2n_ecdsa_secp256r1_sha256 */
&s2n_ecdsa_secp256r1_sha256,
&s2n_ecdsa_sha384, /* same iana value as TLS 1.3 s2n_ecdsa_secp384r1_sha384 */
&s2n_ecdsa_secp384r1_sha384,
&s2n_ecdsa_sha512,
&s2n_ecdsa_sha224,
/* SHA-1 Legacy */
&s2n_rsa_pkcs1_sha1,
&s2n_ecdsa_sha1,
};
/* Add s2n_ecdsa_secp521r1_sha512 */
const struct s2n_signature_scheme* const s2n_sig_scheme_pref_list_20201021[] = {
/* RSA PSS */
&s2n_rsa_pss_pss_sha256,
&s2n_rsa_pss_pss_sha384,
&s2n_rsa_pss_pss_sha512,
&s2n_rsa_pss_rsae_sha256,
&s2n_rsa_pss_rsae_sha384,
&s2n_rsa_pss_rsae_sha512,
/* RSA PKCS1 */
&s2n_rsa_pkcs1_sha256,
&s2n_rsa_pkcs1_sha384,
&s2n_rsa_pkcs1_sha512,
&s2n_rsa_pkcs1_sha224,
/* ECDSA - TLS 1.2 */
&s2n_ecdsa_sha256, /* same iana value as TLS 1.3 s2n_ecdsa_secp256r1_sha256 */
&s2n_ecdsa_secp256r1_sha256,
&s2n_ecdsa_sha384, /* same iana value as TLS 1.3 s2n_ecdsa_secp384r1_sha384 */
&s2n_ecdsa_secp384r1_sha384,
&s2n_ecdsa_sha512, /* same iana value as TLS 1.3 s2n_ecdsa_secp521r1_sha512 */
&s2n_ecdsa_secp521r1_sha512,
&s2n_ecdsa_sha224,
/* SHA-1 Legacy */
&s2n_rsa_pkcs1_sha1,
&s2n_ecdsa_sha1,
};
const struct s2n_signature_preferences s2n_signature_preferences_20140601 = {
.count = s2n_array_len(s2n_sig_scheme_pref_list_20140601),
.signature_schemes = s2n_sig_scheme_pref_list_20140601,
};
const struct s2n_signature_preferences s2n_signature_preferences_20200207 = {
.count = s2n_array_len(s2n_sig_scheme_pref_list_20200207),
.signature_schemes = s2n_sig_scheme_pref_list_20200207,
};
const struct s2n_signature_preferences s2n_signature_preferences_20201021 = {
.count = s2n_array_len(s2n_sig_scheme_pref_list_20201021),
.signature_schemes = s2n_sig_scheme_pref_list_20201021,
};
const struct s2n_signature_preferences s2n_signature_preferences_null = {
.count = 0,
.signature_schemes = NULL,
};
/* TLS1.3 supported signature schemes, without SHA-1 legacy algorithms */
const struct s2n_signature_scheme* const s2n_sig_scheme_pref_list_20201110[] = {
/* RSA PSS */
&s2n_rsa_pss_pss_sha256,
&s2n_rsa_pss_pss_sha384,
&s2n_rsa_pss_pss_sha512,
&s2n_rsa_pss_rsae_sha256,
&s2n_rsa_pss_rsae_sha384,
&s2n_rsa_pss_rsae_sha512,
/* RSA PKCS1 */
&s2n_rsa_pkcs1_sha256,
&s2n_rsa_pkcs1_sha384,
&s2n_rsa_pkcs1_sha512,
&s2n_rsa_pkcs1_sha224,
/* ECDSA - TLS 1.2 */
&s2n_ecdsa_sha256, /* same iana value as TLS 1.3 s2n_ecdsa_secp256r1_sha256 */
&s2n_ecdsa_secp256r1_sha256,
&s2n_ecdsa_sha384, /* same iana value as TLS 1.3 s2n_ecdsa_secp384r1_sha384 */
&s2n_ecdsa_secp384r1_sha384,
&s2n_ecdsa_sha512,
&s2n_ecdsa_sha224,
};
const struct s2n_signature_preferences s2n_certificate_signature_preferences_20201110 = {
.count = s2n_array_len(s2n_sig_scheme_pref_list_20201110),
.signature_schemes = s2n_sig_scheme_pref_list_20201110,
};
/* Based on s2n_sig_scheme_pref_list_20140601 but with all hashes < SHA-384 removed */
const struct s2n_signature_scheme* const s2n_sig_scheme_pref_list_20210816[] = {
/* RSA PKCS1 */
&s2n_rsa_pkcs1_sha384,
&s2n_rsa_pkcs1_sha512,
/* ECDSA - TLS 1.2 */
&s2n_ecdsa_sha384, /* same iana value as TLS 1.3 s2n_ecdsa_secp384r1_sha384 */
&s2n_ecdsa_sha512,
};
const struct s2n_signature_preferences s2n_signature_preferences_20210816 = {
.count = s2n_array_len(s2n_sig_scheme_pref_list_20210816),
.signature_schemes = s2n_sig_scheme_pref_list_20210816
};
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