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diff --git a/src/libsimaka/simaka_hooks.h b/src/libsimaka/simaka_hooks.h
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+++ b/src/libsimaka/simaka_hooks.h
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+/*
+ * Copyright (C) 2008-2011 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 simaka_hooks simaka_hooks
+ * @{ @ingroup libsimaka
+ */
+
+#ifndef SIMAKA_HOOKS_H_
+#define SIMAKA_HOOKS_H_
+
+typedef struct simaka_hooks_t simaka_hooks_t;
+
+#include "simaka_message.h"
+
+/**
+ * Additional hooks invoked during EAP-SIM/AKA message processing.
+ */
+struct simaka_hooks_t {
+
+	/**
+	 * SIM/AKA message parsing.
+	 *
+	 * As a SIM/AKA optionally contains encrypted attributes, the hook
+	 * might get invoked twice, once before and once after decryption.
+	 *
+	 * @param message	SIM/AKA message
+	 * @param inbound	TRUE for incoming messages, FALSE for outgoing
+	 * @param decrypted	TRUE if AT_ENCR_DATA has been decrypted
+	 */
+	void (*message)(simaka_hooks_t *this, simaka_message_t *message,
+					bool inbound, bool decrypted);
+
+	/**
+	 * SIM/AKA encryption/authentication key hooks.
+	 *
+	 * @param k_encr	derived SIM/AKA encryption key k_encr
+	 * @param k_auth	derived SIM/AKA authentication key k_auth
+	 */
+	void (*keys)(simaka_hooks_t *this, chunk_t k_encr, chunk_t k_auth);
+};
+
+#endif /** SIMAKA_HOOKS_H_ @}*/