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diff --git a/src/libstrongswan/crypto/prfs/prf.h b/src/libstrongswan/crypto/prfs/prf.h
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+++ b/src/libstrongswan/crypto/prfs/prf.h
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+/**
+ * @file prf.h
+ * 
+ * @brief Interface prf_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 PRF_H_
+#define PRF_H_
+
+typedef enum pseudo_random_function_t pseudo_random_function_t;
+typedef struct prf_t prf_t;
+
+#include <library.h>
+
+/**
+ * @brief Pseudo random function, as in IKEv2 RFC 3.3.2.
+ *
+ * PRF algorithms not defined in IKEv2 are allocated in "private use"
+ * space.
+ *
+ * @ingroup prfs
+ */
+enum pseudo_random_function_t {
+	PRF_UNDEFINED = 1024,
+	/** Implemented via hmac_prf_t. */
+	PRF_HMAC_MD5 = 1,
+	/** Implemented via hmac_prf_t. */
+	PRF_HMAC_SHA1 = 2,
+	PRF_HMAC_TIGER = 3,
+	PRF_AES128_CBC = 4,
+	/** Implemented via hmac_prf_t. */
+	PRF_HMAC_SHA2_256 = 5,
+	/** Implemented via hmac_prf_t. */
+	PRF_HMAC_SHA2_384 = 6,
+	/** Implemented via hmac_prf_t. */
+	PRF_HMAC_SHA2_512 = 7,
+	/** Implemented via fips_prf_t, other output sizes would be possible */
+	PRF_FIPS_SHA1_160 = 1025,
+	/** Could be implemented via fips_prf_t, uses fixed output size of 160bit */
+	PRF_FIPS_DES = 1026,
+};
+
+/**
+ * enum name for encryption_algorithm_t.
+ */
+extern enum_name_t *pseudo_random_function_names;
+
+/**
+ * @brief Generic interface for pseudo-random-functions.
+ * 
+ * @b Constructors:
+ *  - prf_create()
+ *  - hmac_prf_create()
+ * 
+ * @todo Implement more prf algorithms
+ * 
+ * @ingroup prfs
+ */
+struct prf_t {
+	/**
+	 * @brief Generates pseudo random bytes and writes them in the buffer.
+	 *
+	 * @param this			calling object
+	 * @param seed			a chunk containing the seed for the next bytes
+	 * @param[out] buffer	pointer where the generated bytes will be written
+	 */
+	void (*get_bytes) (prf_t *this, chunk_t seed, u_int8_t *buffer);
+	
+	/**
+	 * @brief Generates pseudo random bytes and allocate space for them.
+	 * 
+	 * @param this			calling object
+	 * @param seed			a chunk containing the seed for the next bytes
+	 * @param[out] chunk	chunk which will hold generated bytes
+	 */
+	void (*allocate_bytes) (prf_t *this, chunk_t seed, chunk_t *chunk);
+	
+	/**
+	 * @brief Get the block size of this prf_t object.
+	 * 
+	 * @param this			calling object
+	 * @return				block size in bytes
+	 */
+	size_t (*get_block_size) (prf_t *this);
+	
+	/**
+	 * @brief Get the key size of this prf_t object.
+	 *
+	 * This is a suggestion only, all implemented PRFs accept variable key
+	 * length.
+	 * 
+	 * @param this			calling object
+	 * @return				key size in bytes
+	 */
+	size_t (*get_key_size) (prf_t *this);
+	
+	/**
+	 * @brief Set the key for this prf_t object.
+	 * 
+	 * @param this			calling object
+	 * @param key			key to set
+	 */
+	void (*set_key) (prf_t *this, chunk_t key);
+	
+	/**
+	 * @brief Destroys a prf object.
+	 *
+	 * @param this 			calling object
+	 */
+	void (*destroy) (prf_t *this);
+};
+
+/**
+ * @brief Generic constructor for a prf_t oject.
+ * 
+ * @param pseudo_random_function	Algorithm to use
+ * @return
+ * 									- prf_t object
+ * 									- NULL if prf algorithm not supported
+ *
+ * @ingroup prfs
+ */
+prf_t *prf_create(pseudo_random_function_t pseudo_random_function);
+
+#endif /*PRF_H_*/