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diff --git a/src/libstrongswan/plugins/cmac/cmac.h b/src/libstrongswan/plugins/cmac/cmac.h
new file mode 100644
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+++ b/src/libstrongswan/plugins/cmac/cmac.h
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+/*
+ * Copyright (C) 2012 Tobias Brunner
+ * 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 cmac cmac
+ * @{ @ingroup cmac_p
+ */
+
+#ifndef CMAC_H_
+#define CMAC_H_
+
+#include <crypto/crypters/crypter.h>
+
+typedef struct cmac_t cmac_t;
+
+/**
+ * Cipher-based Message Authentication Code (CMAC).
+ *
+ * This class implements the message authentication algorithm
+ * described in RFC 4493.
+ */
+struct cmac_t {
+
+	/**
+	 * Generate message authentication code.
+	 *
+	 * If buffer is NULL, no result is given back. A next call will
+	 * append the data to already supplied data. If buffer is not NULL,
+	 * the mac of all apended data is calculated, returned and the internal
+	 * state is reset.
+	 *
+	 * @param data		chunk of data to authenticate
+	 * @param buffer	pointer where the generated bytes will be written
+	 */
+	void (*get_mac) (cmac_t *this, chunk_t data, u_int8_t *buffer);
+
+	/**
+	 * Get the block size of this cmac_t object.
+	 *
+	 * @return			block size in bytes
+	 */
+	size_t (*get_block_size) (cmac_t *this);
+
+	/**
+	 * Set the key for this cmac_t object.
+	 *
+	 * @param key		key to set
+	 */
+	void (*set_key) (cmac_t *this, chunk_t key);
+
+	/**
+	 * Destroys a cmac_t object.
+	 */
+	void (*destroy) (cmac_t *this);
+};
+
+/**
+ * Creates a new cmac_t object.
+ *
+ * @param algo			underlying crypto algorithm
+ * @param key_size		key size to use, if required for algorithm
+ * @return				cmac_t object, NULL if not supported
+ */
+cmac_t *cmac_create(encryption_algorithm_t algo, size_t key_size);
+
+#endif /** CMAC_H_ @}*/