/*
 * Copyright 2017 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 <openssl/evp.h>

#include "crypto/s2n_openssl.h"

struct s2n_evp_digest {
    const EVP_MD *md;
    EVP_MD_CTX *ctx;
};

struct s2n_evp_hmac_state {
    struct s2n_evp_digest evp_digest;
    EVP_PKEY *mac_key;
};

/* Define API's that change based on the OpenSSL Major Version. */
#if S2N_OPENSSL_VERSION_AT_LEAST(1,1,0) && !defined(LIBRESSL_VERSION_NUMBER)
#define S2N_EVP_MD_CTX_NEW() (EVP_MD_CTX_new())
#define S2N_EVP_MD_CTX_RESET(md_ctx) (EVP_MD_CTX_reset(md_ctx))
#define S2N_EVP_MD_CTX_FREE(md_ctx) (EVP_MD_CTX_free(md_ctx))
#else
#define S2N_EVP_MD_CTX_NEW() (EVP_MD_CTX_create())
#define S2N_EVP_MD_CTX_RESET(md_ctx) (EVP_MD_CTX_cleanup(md_ctx))
#define S2N_EVP_MD_CTX_FREE(md_ctx) (EVP_MD_CTX_destroy(md_ctx))
#endif

extern int s2n_digest_allow_md5_for_fips(struct s2n_evp_digest *evp_digest);
extern int s2n_digest_is_md5_allowed_for_fips(struct s2n_evp_digest *evp_digest);