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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. 
 */ 
 
#pragma once 
 
#include <s2n.h> 
#include <strings.h> 
 
#include "crypto/s2n_hash.h" 
#include "crypto/s2n_signature.h" 
#include "crypto/s2n_ecc_evp.h" 
 
struct s2n_signature_scheme { 
    uint16_t iana_value; 
    s2n_hash_algorithm hash_alg; 
    s2n_signature_algorithm sig_alg; 
    uint8_t minimum_protocol_version; 
    uint8_t maximum_protocol_version; 
    uint16_t libcrypto_nid; 
 
    /* Curve is only specified for ECDSA Signatures */ 
    struct s2n_ecc_named_curve const *signature_curve; 
}; 
 
struct s2n_signature_preferences{ 
    uint8_t count; 
    const struct s2n_signature_scheme *const *signature_schemes; 
}; 
 
/* RSA PKCS1 */ 
/* s2n_rsa_pkcs1_md5_sha1 is not in any preference list, but it is needed since it's the default for TLS 1.0 and 1.1 if 
 * no SignatureScheme is sent. */ 
extern const struct s2n_signature_scheme s2n_rsa_pkcs1_md5_sha1; 
extern const struct s2n_signature_scheme s2n_rsa_pkcs1_sha1; 
extern const struct s2n_signature_scheme s2n_rsa_pkcs1_sha224; 
extern const struct s2n_signature_scheme s2n_rsa_pkcs1_sha256; 
extern const struct s2n_signature_scheme s2n_rsa_pkcs1_sha384; 
extern const struct s2n_signature_scheme s2n_rsa_pkcs1_sha512; 
 
/* TLS 1.2 Compatible ECDSA Schemes */ 
extern const struct s2n_signature_scheme s2n_ecdsa_sha1; 
extern const struct s2n_signature_scheme s2n_ecdsa_sha224; 
extern const struct s2n_signature_scheme s2n_ecdsa_sha256; 
extern const struct s2n_signature_scheme s2n_ecdsa_sha384; 
extern const struct s2n_signature_scheme s2n_ecdsa_sha512; 
 
/* TLS 1.3 Compatible ECDSA Schemes */ 
extern const struct s2n_signature_scheme s2n_ecdsa_secp256r1_sha256; 
extern const struct s2n_signature_scheme s2n_ecdsa_secp384r1_sha384; 
extern const struct s2n_signature_scheme s2n_ecdsa_secp521r1_sha512; 
 
/* RSA PSS */ 
/* 
 * Use RSA-PSS-RSAE instead of RSA-PSS-PSS in order to work with older certificates. 
 * For more info see: https://crypto.stackexchange.com/a/58708 
 */ 
extern const struct s2n_signature_scheme s2n_rsa_pss_pss_sha256; 
extern const struct s2n_signature_scheme s2n_rsa_pss_pss_sha384; 
extern const struct s2n_signature_scheme s2n_rsa_pss_pss_sha512; 
extern const struct s2n_signature_scheme s2n_rsa_pss_rsae_sha256; 
extern const struct s2n_signature_scheme s2n_rsa_pss_rsae_sha384; 
extern const struct s2n_signature_scheme s2n_rsa_pss_rsae_sha512; 
 
extern const struct s2n_signature_preferences s2n_signature_preferences_20140601; 
extern const struct s2n_signature_preferences s2n_signature_preferences_20200207; 
extern const struct s2n_signature_preferences s2n_signature_preferences_20201021; 
extern const struct s2n_signature_preferences s2n_signature_preferences_null; 
 
extern const struct s2n_signature_preferences s2n_certificate_signature_preferences_20201110;