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diff --git a/src/charon/config/backends/backend.h b/src/charon/config/backends/backend.h
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+++ b/src/charon/config/backends/backend.h
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+/**
+ * @file backend.h
+ * 
+ * @brief Interface backend_t.
+ *  
+ */
+
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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 General Public License
+ * for more details.
+ */
+
+#ifndef BACKEND_H_
+#define BACKEND_H_
+
+typedef struct backend_t backend_t;
+
+#include <library.h>
+#include <config/ike_cfg.h>
+#include <config/peer_cfg.h>
+#include <utils/linked_list.h>
+
+/**
+ * @brief The interface for a configuration backend.
+ *
+ * A configuration backend is loaded by the backend_manager. It does the actual
+ * configuration lookup for the method it implements. See backend_manager_t for
+ * more information.
+ *
+ * @b Constructors:
+ * - implementations constructors
+ * 
+ * @ingroup backends
+ */
+struct backend_t {
+
+	/**
+	 * @brief Get an ike_cfg identified by two hosts.
+	 *
+	 * @param this				calling object
+	 * @param my_host			address of own host
+	 * @param other_host		address of remote host
+	 * @return					matching ike_config, or NULL if none found
+	 */
+	ike_cfg_t *(*get_ike_cfg)(backend_t *this, 
+							  host_t *my_host, host_t *other_host);
+	
+	/**
+	 * @brief Get a peer_cfg identified by two IDs.
+	 * 
+	 * Select a config based on the two IDs and the other's certificate issuer
+	 *
+	 * @param this				calling object
+	 * @param my_id				own ID
+	 * @param other_id			peer ID
+	 * @param other_ca_info		info record on issuer of peer certificate
+	 * @return					matching peer_config, or NULL if none found
+	 */
+	peer_cfg_t *(*get_peer_cfg)(backend_t *this,
+								identification_t *my_id, identification_t *other_id,
+								ca_info_t *other_ca_info);
+	
+	/**
+	 * @brief Check if a backend is writable and implements writable_backend_t.
+	 *
+	 * @param this		calling object
+	 * @return			TRUE if backend implements writable_backend_t.
+	 */
+	bool (*is_writeable)(backend_t *this);
+	
+	/**
+	 * @brief Destroy a backend.
+	 *
+	 * @param this		calling object
+	 */
+	void (*destroy)(backend_t *this);
+};
+
+
+/**
+ * Construction to create a backend.
+ */
+typedef backend_t*(*backend_constructor_t)(void);
+
+#endif /* BACKEND_H_ */
+