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diff --git a/src/libstrongswan/crypto/prf_plus.h b/src/libstrongswan/crypto/prf_plus.h
new file mode 100644
index 000000000..90f9ce2eb
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+++ b/src/libstrongswan/crypto/prf_plus.h
@@ -0,0 +1,92 @@
+/**
+ * @file prf_plus.h
+ * 
+ * @brief Interface for prf_plus.h.
+ * 
+ */
+
+/*
+ * 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_PLUS_H_
+#define PRF_PLUS_H_
+
+typedef struct prf_plus_t prf_plus_t;
+
+#include <crypto/prfs/prf.h>
+
+/**
+ * @brief Implementation of the prf+ function described in IKEv2 RFC.
+ *
+ * This class implements the prf+ algorithm. Internally it uses a pseudo random
+ * function, which implements the prf_t interface.
+ * 
+ * See IKEv2 RFC 2.13.
+ * 
+ * @b Constructors:
+ *  - prf_plus_create()
+ * 
+ * @ingroup transforms
+ */
+struct prf_plus_t {
+	/**
+	 * @brief Get pseudo random bytes.
+	 * 
+	 * Get the next few bytes of the prf+ output. Space
+	 * must be allocated by the caller.
+	 * 
+	 * @param this			calling object
+	 * @param length		number of bytes to get
+	 * @param[out] buffer	pointer where the generated bytes will be written
+	 */
+	void (*get_bytes) (prf_plus_t *this, size_t length, u_int8_t *buffer);
+	
+	/**
+	 * @brief Allocate pseudo random bytes.
+	 * 
+	 * Get the next few bytes of the prf+ output. This function
+	 * will allocate the required space.
+	 * 
+	 * @param this			calling object
+	 * @param length		number of bytes to get
+	 * @param[out] chunk	chunk which will hold generated bytes
+	 */
+	void (*allocate_bytes) (prf_plus_t *this, size_t length, chunk_t *chunk);
+	
+	/**
+	 * @brief Destroys a prf_plus_t object.
+	 *
+	 * @param this 			calling object
+	 */
+	void (*destroy) (prf_plus_t *this);
+};
+
+/**
+ * @brief Creates a new prf_plus_t object.
+ * 
+ * Seed will be cloned. prf will
+ * not be cloned, must be destroyed outside after
+ * prf_plus_t usage.
+ * 
+ * @param prf				prf object to use
+ * @param seed				input seed for prf
+ * @return					prf_plus_t object
+ * 
+ * @ingroup transforms
+ */
+prf_plus_t *prf_plus_create(prf_t *prf, chunk_t seed);
+
+#endif /*PRF_PLUS_H_*/