Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

Sources/OpenVPN3/openvpn/openssl/util/engine.hpp

@@ -0,0 +1,61 @@
+//    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