engine.hpp

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//    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- OpenVPN Inc.
//
//    SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
 
// Method to set up a particular OpenSSL engine type
 
#ifndef OPENVPN_OPENSSL_UTIL_ENGINE_H
#define OPENVPN_OPENSSL_UTIL_ENGINE_H
 
#include <string>
 
#include <openssl/opensslv.h>
 
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
#define OPENSSL_NO_ENGINE
#endif
 
#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