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diff --git a/src/libstrongswan/crypto/hmac.h b/src/libstrongswan/crypto/hmac.h
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+/**
+ * @file hmac.h
+ * 
+ * @brief Interface of hmac_t.
+ */
+
+/*
+ * Copyright (C) 2005-2006 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * 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 HMAC_H_
+#define HMAC_H_
+
+typedef struct hmac_t hmac_t;
+
+#include <crypto/hashers/hasher.h>
+
+/**
+ * @brief Message authentication using hash functions.
+ *
+ * This class implements the message authenticaion algorithm
+ * described in RFC2104. It uses a hash function, wich must
+ * be implemented as a hasher_t class.
+ *
+ * See http://www.faqs.org/rfcs/rfc2104.html for RFC.
+ * @see 	
+ * 			- hasher_t
+ * 			- prf_hmac_t
+ *
+ * @b Constructors:
+ *  - hmac_create()
+ *
+ * @ingroup transforms
+ */
+struct hmac_t {
+	/**
+	 * @brief 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
+	 * state of the hmac_t is reseted.
+	 * 
+	 * @param this			calling object
+	 * @param data			chunk of data to authenticate
+	 * @param[out] buffer	pointer where the generated bytes will be written
+	 */
+	void (*get_mac) (hmac_t *this, chunk_t data, u_int8_t *buffer);
+	
+	/**
+	 * @brief Generates message authentication code and 
+	 * allocate space for them.
+	 * 
+	 * If chunk is NULL, no result is given back. A next call will
+	 * append the data to already supplied. If chunk is not NULL, 
+	 * the mac of all apended data is calculated, returned and the
+	 * state of the hmac_t reset;
+	 * 
+	 * @param this			calling object
+	 * @param data			chunk of data to authenticate
+	 * @param[out] chunk	chunk which will hold generated bytes
+	 */
+	void (*allocate_mac) (hmac_t *this, chunk_t data, chunk_t *chunk);
+	
+	/**
+	 * @brief Get the block size of this hmac_t object.
+	 * 
+	 * @param this			calling object
+	 * @return				block size in bytes
+	 */
+	size_t (*get_block_size) (hmac_t *this);	
+	
+	/**
+	 * @brief Set the key for this hmac_t object.
+	 * 
+	 * Any key length is accepted.
+	 * 
+	 * @param this			calling object
+	 * @param key			key to set
+	 */
+	void (*set_key) (hmac_t *this, chunk_t key);
+	
+	/**
+	 * @brief Destroys a hmac_t object.
+	 *
+	 * @param this 			calling object
+	 */
+	void (*destroy) (hmac_t *this);
+};
+
+/**
+ * @brief Creates a new hmac_t object.
+ * 
+ * Creates a hasher_t object internally.
+ * 
+ * @param hash_algorithm		hash algorithm to use
+ * @return
+ *								- hmac_t object
+ *								- NULL if hash algorithm is not supported
+ * 
+ * @ingroup transforms
+ */
+hmac_t *hmac_create(hash_algorithm_t hash_algorithm);
+
+#endif /*HMAC_H_*/