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diff --git a/src/charon/encoding/payloads/auth_payload.h b/src/charon/encoding/payloads/auth_payload.h
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+++ b/src/charon/encoding/payloads/auth_payload.h
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+/**
+ * @file auth_payload.h
+ * 
+ * @brief Interface of auth_payload_t.
+ * 
+ */
+
+/*
+ * 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.
+ */
+
+#ifndef AUTH_PAYLOAD_H_
+#define AUTH_PAYLOAD_H_
+
+typedef struct auth_payload_t auth_payload_t;
+
+#include <library.h>
+#include <encoding/payloads/payload.h>
+#include <sa/authenticators/authenticator.h>
+
+/**
+ * Length of a auth payload without the auth data in bytes.
+ * 
+ * @ingroup payloads
+ */
+#define AUTH_PAYLOAD_HEADER_LENGTH 8
+
+/**
+ * @brief Class representing an IKEv2 AUTH payload.
+ *
+ * The AUTH payload format is described in RFC section 3.8.
+ *
+ * @b Constructors:
+ * - auth_payload_create()
+ *
+ * @ingroup payloads
+ */
+struct auth_payload_t {
+	
+	/**
+	 * The payload_t interface.
+	 */
+	payload_t payload_interface;
+
+	/**
+	 * @brief Set the AUTH method.
+	 *
+	 * @param this 			calling auth_payload_t object
+	 * @param method		auth_method_t to use
+	 */
+	void (*set_auth_method) (auth_payload_t *this, auth_method_t method);
+	
+	/**
+	 * @brief Get the AUTH method.
+	 *
+	 * @param this 			calling auth_payload_t object
+	 * @return				auth_method_t used
+	 */
+	auth_method_t (*get_auth_method) (auth_payload_t *this);
+	
+	/**
+	 * @brief Set the AUTH data.
+	 * 
+	 * Data are getting cloned.
+	 *
+	 * @param this 			calling auth_payload_t object
+	 * @param data			AUTH data as chunk_t
+	 */
+	void (*set_data) (auth_payload_t *this, chunk_t data);
+	
+	/**
+	 * @brief Get the AUTH data.
+	 * 
+	 * Returned data are a copy of the internal one.
+	 *
+	 * @param this 			calling auth_payload_t object
+	 * @return				AUTH data as chunk_t
+	 */
+	chunk_t (*get_data_clone) (auth_payload_t *this);
+	
+	/**
+	 * @brief Get the AUTH data.
+	 * 
+	 * Returned data are NOT copied
+	 *
+	 * @param this 			calling auth_payload_t object
+	 * @return				AUTH data as chunk_t
+	 */
+	chunk_t (*get_data) (auth_payload_t *this);
+	
+	/**
+	 * @brief Destroys an auth_payload_t object.
+	 *
+	 * @param this 			auth_payload_t object to destroy
+	 */
+	void (*destroy) (auth_payload_t *this);
+};
+
+/**
+ * @brief Creates an empty auth_payload_t object.
+ * 
+ * @return auth_payload_t object
+ * 
+ * @ingroup payloads
+ */
+auth_payload_t *auth_payload_create(void);
+
+
+#endif /* AUTH_PAYLOAD_H_ */