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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.
*/
/*
* This feature probe checks if the linked libcrypto has ENGINE support.
* https://docs.openssl.org/1.0.2/man3/engine/
*/
/*
* We would always expect the `openssl/engine.h` header to be available.
* However, some platforms (CentOS 10, Fedora 41, and RHEL 10) have reportedly
* been removing the `openssl/engine.h` header.
*
* See the related issues:
* - https://github.com/aws/s2n-tls/pull/4705
* - https://github.com/aws/s2n-tls/pull/4873
*/
#include <openssl/engine.h>
/* LibreSSL requires <openssl/rand.h> include.
* https://github.com/aws/s2n-tls/issues/153#issuecomment-129651643
*/
#include <openssl/rand.h>
int s2n_noop_rand(unsigned char *buf, int num)
{
return 1;
}
int main()
{
/* Init usage in utils/s2n_random.c */
ENGINE *e = ENGINE_new();
ENGINE_set_id(e, "id");
ENGINE_set_name(e, "name");
ENGINE_set_flags(e, ENGINE_FLAGS_NO_REGISTER_ALL);
ENGINE_set_init_function(e, NULL);
ENGINE_set_RAND(e, NULL);
ENGINE_add(e);
ENGINE_init(e);
ENGINE_set_default(e, ENGINE_METHOD_RAND);
/* Cleanup usage in utils/s2n_random.c */
ENGINE_remove(e);
ENGINE_finish(e);
ENGINE_unregister_RAND(e);
ENGINE_free(e);
ENGINE_cleanup();
RAND_set_rand_engine(NULL);
RAND_set_rand_method(NULL);
/* RAND_METHOD is gated behind S2N_LIBCRYPTO_SUPPORTS_ENGINE because AWS-LC has
* a different signature for RAND_METHOD and fails to compile.
*
* - AWS-LC: https://github.com/aws/aws-lc/blob/main/include/openssl/rand.h#L124
* - OpenSSL: https://github.com/openssl/openssl/blob/master/include/openssl/rand.h#L42
*/
RAND_METHOD s2n_noop_rand_method = {
.seed = NULL,
.bytes = s2n_noop_rand,
.cleanup = NULL,
.add = NULL,
.pseudorand = s2n_noop_rand,
.status = NULL
};
return 0;
}
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