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C++

// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012-2017 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
// Method to set up a particular OpenSSL engine type
#ifndef OPENVPN_OPENSSL_UTIL_ENGINE_H
#define OPENVPN_OPENSSL_UTIL_ENGINE_H
#include <string>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#include <openvpn/common/exception.hpp>
#include <openvpn/openssl/util/error.hpp>
namespace openvpn {
OPENVPN_EXCEPTION(openssl_engine_error);
inline void openssl_setup_engine (const std::string& engine)
{
#ifndef OPENSSL_NO_ENGINE
ENGINE_load_builtin_engines ();
if (engine == "auto")
{
ENGINE_register_all_complete ();
return;
}
ENGINE *e = ENGINE_by_id (engine.c_str());
if (!e)
throw openssl_engine_error();
if (!ENGINE_set_default (e, ENGINE_METHOD_ALL))
throw openssl_engine_error();
#endif
}
} // namespace openvpn
#endif // OPENVPN_OPENSSL_UTIL_ENGINE_H