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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 "crypto/s2n_fips.h"
#include <openssl/crypto.h>
#if defined(S2N_INTERN_LIBCRYPTO) && defined(OPENSSL_FIPS)
#error "Interning with OpenSSL fips-validated libcrypto is not currently supported. See https://github.com/aws/s2n-tls/issues/2741"
#endif
static int s2n_fips_mode = 0;
/* FIPS mode can be checked if OpenSSL was configured and built for FIPS which then defines OPENSSL_FIPS.
*
* AWS-LC always defines FIPS_mode() that you can call and check what the library was built with. It does not define
* a public OPENSSL_FIPS/AWSLC_FIPS macro that we can (or need to) check here
*
* Safeguard with macro's, for example because Libressl dosn't define
* FIPS_mode() by default.
*
* Note: FIPS_mode() does not change the FIPS state of libcrypto. This only returns the current state. Applications
* using s2n must call FIPS_mode_set(1) prior to s2n_init.
* */
bool s2n_libcrypto_is_fips(void)
{
#if defined(OPENSSL_FIPS) || defined(OPENSSL_IS_AWSLC)
if (FIPS_mode() == 1) {
return true;
}
#endif
return false;
}
int s2n_fips_init(void)
{
s2n_fips_mode = 0;
if (s2n_libcrypto_is_fips()) {
s2n_fips_mode = 1;
}
return 0;
}
/* Return 1 if FIPS mode is enabled, 0 otherwise. FIPS mode must be enabled prior to calling s2n_init(). */
int s2n_is_in_fips_mode(void)
{
return s2n_fips_mode;
}
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