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/*
*
* Copyright 2020 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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 is a sample openSSL engine which tests the openSSL
// engine plugability with gRPC.
// This sample engine expects KeyId to be actual PEM encoded
// key itself and just calls standard openSSL functions.
#include <openssl/bio.h>
#include <openssl/engine.h>
#include <openssl/pem.h>
#ifndef OPENSSL_IS_BORINGSSL
#include <stdio.h>
#include <string.h>
extern "C" {
static const char engine_id[] = "libengine_passthrough";
static const char engine_name[] = "A passthrough engine for private keys";
static int e_passthrough_idx = -1;
static int e_passthrough_init(ENGINE* e) {
if (e_passthrough_idx < 0) {
e_passthrough_idx = ENGINE_get_ex_new_index(0, NULL, NULL, NULL, 0);
if (e_passthrough_idx < 0) return 0;
}
return 1;
}
EVP_PKEY* e_passthrough_load_privkey(ENGINE* eng, const char* key_id,
UI_METHOD* ui_method,
void* callback_data) {
EVP_PKEY* pkey = NULL;
BIO* pem = BIO_new_mem_buf((void*)key_id, (int)(strlen(key_id)));
if (pem == NULL) return NULL;
pkey = PEM_read_bio_PrivateKey(pem, NULL, NULL, (void*)"");
BIO_free(pem);
return pkey;
}
int passthrough_bind_helper(ENGINE* e, const char* id) {
if (id && strcmp(id, engine_id)) {
return 0;
}
if (!ENGINE_set_id(e, engine_id) || !ENGINE_set_name(e, engine_name) ||
!ENGINE_set_flags(e, ENGINE_FLAGS_NO_REGISTER_ALL) ||
!ENGINE_set_init_function(e, e_passthrough_init) ||
!ENGINE_set_load_privkey_function(e, e_passthrough_load_privkey)) {
return 0;
}
return 1;
}
IMPLEMENT_DYNAMIC_BIND_FN(passthrough_bind_helper)
IMPLEMENT_DYNAMIC_CHECK_FN()
}
#endif // OPENSSL_IS_BORINGSSL
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