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diff --git a/src/charon/plugins/eap_sim/eap_sim.h b/src/charon/plugins/eap_sim/eap_sim.h
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+/*
+ * Copyright (C) 2007-2008 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.
+ */
+
+/**
+ * @defgroup eap_sim_i eap_sim
+ * @{ @ingroup eap_sim
+ */
+
+#ifndef EAP_SIM_H_
+#define EAP_SIM_H_
+
+typedef struct eap_sim_t eap_sim_t;
+
+#include <sa/authenticators/eap/eap_method.h>
+
+/** the library containing with the triplet functions */
+#ifndef SIM_READER_LIB
+#error SIM_READER_LIB not specified, use --with-sim-reader option
+#endif /* SIM_READER_LIB */
+
+/** 
+ * Cardreaders SIM function.
+ *
+ * @param rand			RAND to run algo with
+ * @param rand_length	length of value in rand
+ * @param sres			buffer to get SRES
+ * @param sres_length	size of buffer in sres, returns bytes written to SRES
+ * @param kc			buffer to get Kc
+ * @param kc_length		size of buffer in Kc, returns bytes written to Kc
+ * @return				zero on success
+ */
+typedef int (*sim_algo_t)(const unsigned char *rand, int rand_length,
+						  unsigned char *sres, int *sres_length, 
+						  unsigned char *kc, int *kc_length);
+
+#ifndef SIM_READER_ALG
+/** the SIM_READER_LIB's algorithm, uses sim_algo_t signature */
+#define SIM_READER_ALG "sim_run_alg"
+#endif /* SIM_READER_ALG */
+
+/** 
+ * Function to get a SIM triplet.
+ *
+ * @param identity		identity (imsi) to get a triplet for			
+ * @param rand			buffer to get RAND
+ * @param rand_length	size of buffer in rand, returns bytes written to RAND
+ * @param sres			buffer to get SRES
+ * @param sres_length	size of buffer in sres, returns bytes written to SRES
+ * @param kc			buffer to get Kc
+ * @param kc_length		size of buffer in Kc, returns bytes written to Kc
+ * @return				zero on success
+ */
+typedef int (*sim_get_triplet_t)(char *identity,
+								 unsigned char *rand, int *rand_length,
+								 unsigned char *sres, int *sres_length, 
+								 unsigned char *kc, int *kc_length);
+						  
+#ifndef SIM_READER_GET_TRIPLET
+/** the SIM_READER_LIB's get-triplet function, uses sim_get_triplet_t signature */
+#define SIM_READER_GET_TRIPLET "sim_get_triplet"
+#endif /* SIM_READER_GET_TRIPLET */
+
+/**
+ * Implementation of the eap_method_t interface using EAP-SIM.
+ *
+ * This EAP-SIM client implementation uses another pluggable library to
+ * access the SIM card/triplet provider. This module is specified using the
+ * SIM_READER_LIB definition. It has to privde a sim_run_alg() function to
+ * calculate a triplet (client), and/or a sim_get_triplet() function to get
+ * a triplet (server). These functions are named to the SIM_READER_ALG and
+ * the SIM_READER_GET_TRIPLET definitions.
+ */
+struct eap_sim_t {
+
+	/**
+	 * Implemented eap_method_t interface.
+	 */
+	eap_method_t eap_method_interface;
+};
+
+/**
+ * Creates the EAP method EAP-SIM acting as server.
+ *
+ * @param server	ID of the EAP server
+ * @param peer		ID of the EAP client
+ * @return			eap_sim_t object
+ */
+eap_sim_t *eap_sim_create_server(identification_t *server, identification_t *peer);
+
+/**
+ * Creates the EAP method EAP-SIM acting as peer.
+ *
+ * @param server	ID of the EAP server
+ * @param peer		ID of the EAP client
+ * @return			eap_sim_t object
+ */
+eap_sim_t *eap_sim_create_peer(identification_t *server, identification_t *peer);
+
+#endif /* EAP_SIM_H_ @}*/