// Copyright 2014 The BoringSSL 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

//

//     https://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.

#include <openssl/engine.h>

#include <assert.h>

#include <string.h>

#include <openssl/ec_key.h>

#include <openssl/err.h>

#include <openssl/mem.h>

#include <openssl/rsa.h>

#include "../internal.h"

#include "../mem_internal.h"

using namespace bssl;

struct engine_st {

  RSA_METHOD *rsa_method;

  ECDSA_METHOD *ecdsa_method;

};

ENGINE *ENGINE_new() { return New<ENGINE>(); }

int ENGINE_free(ENGINE *engine) {

  // Methods are currently required to be static so are not unref'ed.

  Delete(engine);

  return 1;

}

// set_method takes a pointer to a method and its given size and sets

// |*out_member| to point to it. This function might want to be extended in the

// future to support making a copy of the method so that a stable ABI for

// ENGINEs can be supported. But, for the moment, all *_METHODS must be

// static.

static int set_method(void **out_member, const void *method, size_t method_size,

                      size_t compiled_size) {

  const struct openssl_method_common_st *common =

      reinterpret_cast<const openssl_method_common_st *>(method);

  if (method_size != compiled_size || !common->is_static) {

    return 0;

  }

  *out_member = (void *)method;

  return 1;

}

int ENGINE_set_RSA_method(ENGINE *engine, const RSA_METHOD *method,

                          size_t method_size) {

  return set_method((void **)&engine->rsa_method, method, method_size,

                    sizeof(RSA_METHOD));

}

RSA_METHOD *ENGINE_get_RSA_method(const ENGINE *engine) {

  return engine->rsa_method;

}

int ENGINE_set_ECDSA_method(ENGINE *engine, const ECDSA_METHOD *method,

                            size_t method_size) {

  return set_method((void **)&engine->ecdsa_method, method, method_size,

                    sizeof(ECDSA_METHOD));

}

ECDSA_METHOD *ENGINE_get_ECDSA_method(const ENGINE *engine) {

  return engine->ecdsa_method;

}

void METHOD_ref(void *method_in) {

  assert(((struct openssl_method_common_st *)method_in)->is_static);

}

void METHOD_unref(void *method_in) {

  struct openssl_method_common_st *method =

      reinterpret_cast<openssl_method_common_st *>(method_in);

  if (method == nullptr) {

    return;

  }

  assert(method->is_static);

}

OPENSSL_DECLARE_ERROR_REASON(ENGINE, OPERATION_NOT_SUPPORTED)