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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 <openssl/evp.h>
#include <openssl/hmac.h>
#include "crypto/s2n_openssl.h"
#include "utils/s2n_result.h"
struct s2n_evp_digest {
const EVP_MD *md;
EVP_MD_CTX *ctx;
};
struct s2n_evp_hmac_state {
struct s2n_evp_digest evp_digest;
union {
HMAC_CTX *hmac_ctx;
EVP_PKEY *evp_pkey;
} ctx;
};
/* 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
/* On some versions of OpenSSL, "EVP_PKEY_CTX_set_signature_md()" is just a macro that casts digest_alg to "void*",
* which fails to compile when the "-Werror=cast-qual" compiler flag is enabled. So we work around this OpenSSL
* issue by turning off this compiler check for this one function with a cast through.
*/
#define S2N_EVP_PKEY_CTX_set_signature_md(ctx, md) \
EVP_PKEY_CTX_set_signature_md(ctx, (EVP_MD*) (uintptr_t) md)
extern int s2n_digest_allow_md5_for_fips(struct s2n_evp_digest *evp_digest);
extern S2N_RESULT s2n_digest_is_md5_allowed_for_fips(struct s2n_evp_digest *evp_digest, bool *out);
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