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diff --git a/Source/charon/sa/authenticator.h b/Source/charon/sa/authenticator.h
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+++ b/Source/charon/sa/authenticator.h
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+/**
+ * @file authenticator.h
+ *
+ * @brief Interface of authenticator.
+ *
+ */
+
+/*
+ * Copyright (C) 2005 Jan Hutter, 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 _AUTHENTICATOR_H_
+#define _AUTHENTICATOR_H_
+
+
+#include <types.h>
+#include <encoding/payloads/auth_payload.h>
+#include <utils/identification.h>
+#include <sa/ike_sa.h>
+
+
+typedef struct authenticator_t authenticator_t;
+
+
+/**
+ * @brief Class authenticator_t. Used to authenticate a peer.
+ * 
+ * Currently only preshared secret as auth_method supported!
+ * 
+ * @ingroup sa
+ */
+struct authenticator_t {
+
+	/**
+	 * @brief Verifying of given authentication data.
+	 *
+	 * TODO
+	 * @param this 			authenticator_t object
+	 * @return
+	 * 						- NOT_SUPPORTED if auth_method is not supported
+	 */
+	status_t (*verify_authentication) (authenticator_t *this,auth_method_t auth_method, chunk_t auth_data, chunk_t last_message, chunk_t other_nonce,identification_t *my_id,bool *verified);
+
+	/**
+	 * @brief Verifying of given authentication data.
+	 *
+	 * TODO
+	 * @param this 			authenticator_t object
+	 * @return
+	 * 						- NOT_SUPPORTED if auth_method is not supported
+	 */
+	status_t (*allocate_auth_data) (authenticator_t *this,auth_method_t auth_method,chunk_t last_message, chunk_t other_nonce,identification_t *my_id,chunk_t *auth_data);
+
+
+	/**
+	 * @brief Destroys a authenticator_t object.
+	 *
+	 * @param this 			authenticator_t object
+	 */
+	void (*destroy) (authenticator_t *this);
+};
+
+authenticator_t *authenticator_create(protected_ike_sa_t *ike_sa);
+
+#endif //_AUTHENTICATOR_H_