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diff --git a/src/libcharon/sa/ike_sa_id.h b/src/libcharon/sa/ike_sa_id.h
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+++ b/src/libcharon/sa/ike_sa_id.h
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+/*
+ * Copyright (C) 2005-2006 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * 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.
+ */
+
+/**
+ * @defgroup ike_sa_id ike_sa_id
+ * @{ @ingroup sa
+ */
+
+#ifndef IKE_SA_ID_H_
+#define IKE_SA_ID_H_
+
+typedef struct ike_sa_id_t ike_sa_id_t;
+
+#include <library.h>
+
+/**
+ * An object of type ike_sa_id_t is used to identify an IKE_SA.
+ *
+ * An IKE_SA is identified by its initiator and responder spi's.
+ * Additionaly it contains the role of the actual running IKEv2-Daemon
+ * for the specific IKE_SA (original initiator or responder).
+ */
+struct ike_sa_id_t {
+
+	/**
+	 * Set the SPI of the responder.
+	 *
+	 * This function is called when a request or reply of a IKE_SA_INIT is received.
+	 *
+	 * @param responder_spi 	SPI of responder to set
+	 */
+	void (*set_responder_spi) (ike_sa_id_t *this, u_int64_t responder_spi);
+
+	/**
+	 * Set the SPI of the initiator.
+	 *
+	 * @param initiator_spi 	SPI to set
+	 */
+	void (*set_initiator_spi) (ike_sa_id_t *this, u_int64_t initiator_spi);
+
+	/**
+	 * Get the initiator SPI.
+	 *
+	 * @return 					SPI of the initiator
+	 */
+	u_int64_t (*get_initiator_spi) (ike_sa_id_t *this);
+
+	/**
+	 * Get the responder SPI.
+	 *
+	 * @return 					SPI of the responder
+	 */
+	u_int64_t (*get_responder_spi) (ike_sa_id_t *this);
+
+	/**
+	 * Check if two ike_sa_id_t objects are equal.
+	 *
+	 * Two ike_sa_id_t objects are equal if both SPI values and the role matches.
+	 *
+	 * @param other 			ike_sa_id_t object to check if equal
+	 * @return 					TRUE if given ike_sa_id_t are equal, FALSE otherwise
+	 */
+	bool (*equals) (ike_sa_id_t *this, ike_sa_id_t *other);
+
+	/**
+	 * Replace all values of a given ike_sa_id_t object with values.
+	 * from another ike_sa_id_t object.
+	 *
+	 * After calling this function, both objects are equal.
+	 *
+	 * @param other 			ike_sa_id_t object from which values will be taken
+	 */
+	void (*replace_values) (ike_sa_id_t *this, ike_sa_id_t *other);
+
+	/**
+	 * Get the initiator flag.
+	 *
+	 * @return 					TRUE if we are the original initator
+	 */
+	bool (*is_initiator) (ike_sa_id_t *this);
+
+	/**
+	 * Switche the original initiator flag.
+	 *
+	 * @return 					TRUE if we are the original initator after switch, FALSE otherwise
+	 */
+	bool (*switch_initiator) (ike_sa_id_t *this);
+
+	/**
+	 * Clones a given ike_sa_id_t object.
+	 *
+	 * @return 					cloned ike_sa_id_t object
+	 */
+	ike_sa_id_t *(*clone) (ike_sa_id_t *this);
+
+	/**
+	 * Destroys an ike_sa_id_t object.
+	 */
+	void (*destroy) (ike_sa_id_t *this);
+};
+
+/**
+ * Creates an ike_sa_id_t object with specific SPI's and defined role.
+ *
+ * @param initiator_spi			initiators SPI
+ * @param responder_spi			responders SPI
+ * @param is_initiaor			TRUE if we are the original initiator
+ * @return						ike_sa_id_t object
+ */
+ike_sa_id_t * ike_sa_id_create(u_int64_t initiator_spi, u_int64_t responder_spi,
+							   bool is_initiaor);
+
+#endif /** IKE_SA_ID_H_ @}*/