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diff --git a/src/libcharon/sa/eap/eap_inner_method.h b/src/libcharon/sa/eap/eap_inner_method.h
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+++ b/src/libcharon/sa/eap/eap_inner_method.h
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+/*
+ * Copyright (C) 2013 Andreas Steffen
+ * HSR 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 eap_inner_method eap_inner_method
+ * @{ @ingroup eap
+ */
+
+#ifndef EAP_INNER_METHOD_H_
+#define EAP_INNER_METHOD_H_
+
+typedef struct eap_inner_method_t eap_inner_method_t;
+
+#include <library.h>
+
+#include "eap_method.h"
+
+/**
+ * Interface of a weak inner EAP method like EAP-TNC or PT-EAP
+ * that must be encapsulated in a strong TLS-based EAP method 
+ */
+struct eap_inner_method_t {
+
+	/*
+	 * Public EAP method interface
+	 */
+	eap_method_t eap_method;
+
+	/*
+	 * Get type of outer EAP authentication method
+	 *
+	 * @return			outer EAP authentication type
+	 */
+	eap_type_t (*get_auth_type)(eap_inner_method_t *this); 
+
+	/*
+	 * Set type of outer EAP Client/Server authentication
+	 *
+	 * @param type		outer EAP authentication type
+	 */
+	void (*set_auth_type)(eap_inner_method_t *this, eap_type_t type); 
+
+};
+
+#endif /** EAP_INNER_METHOD_H_ @}*/