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// 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.
#ifndef OPENSSL_HEADER_ENGINE_H
#define OPENSSL_HEADER_ENGINE_H
#include <contrib/restricted/google/boringssl/include/openssl/base.h> // IWYU pragma: export
#if defined(__cplusplus)
extern "C" {
#endif
// Engines are collections of methods. Methods are tables of function pointers,
// defined for certain algorithms, that allow operations on those algorithms to
// be overridden via a callback. This can be used, for example, to implement an
// RSA* that forwards operations to a hardware module.
//
// Methods are reference counted but |ENGINE|s are not. When creating a method,
// you should zero the whole structure and fill in the function pointers that
// you wish before setting it on an |ENGINE|. Any functions pointers that
// are NULL indicate that the default behaviour should be used.
// Allocation and destruction.
// ENGINE_new returns an empty ENGINE that uses the default method for all
// algorithms.
OPENSSL_EXPORT ENGINE *ENGINE_new(void);
// ENGINE_free decrements the reference counts for all methods linked from
// |engine| and frees |engine| itself. It returns one.
OPENSSL_EXPORT int ENGINE_free(ENGINE *engine);
// Method accessors.
//
// Method accessors take a method pointer and the size of the structure. The
// size allows for ABI compatibility in the case that the method structure is
// extended with extra elements at the end. Methods are always copied by the
// set functions.
//
// Set functions return one on success and zero on allocation failure.
OPENSSL_EXPORT int ENGINE_set_RSA_method(ENGINE *engine,
const RSA_METHOD *method,
size_t method_size);
OPENSSL_EXPORT RSA_METHOD *ENGINE_get_RSA_method(const ENGINE *engine);
OPENSSL_EXPORT int ENGINE_set_ECDSA_method(ENGINE *engine,
const ECDSA_METHOD *method,
size_t method_size);
OPENSSL_EXPORT ECDSA_METHOD *ENGINE_get_ECDSA_method(const ENGINE *engine);
// Generic method functions.
//
// These functions take a void* type but actually operate on all method
// structures.
// METHOD_ref increments the reference count of |method|. This is a no-op for
// now because all methods are currently static.
void METHOD_ref(void *method);
// METHOD_unref decrements the reference count of |method| and frees it if the
// reference count drops to zero. This is a no-op for now because all methods
// are currently static.
void METHOD_unref(void *method);
// Private functions.
// openssl_method_common_st contains the common part of all method structures.
// This must be the first member of all method structures.
struct openssl_method_common_st {
int references; // dummy – not used.
char is_static;
};
#if defined(__cplusplus)
} // extern C
extern "C++" {
BSSL_NAMESPACE_BEGIN
BORINGSSL_MAKE_DELETER(ENGINE, ENGINE_free)
BSSL_NAMESPACE_END
} // extern C++
#endif
#define ENGINE_R_OPERATION_NOT_SUPPORTED 100
#endif // OPENSSL_HEADER_ENGINE_H
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