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diff --git a/src/libstrongswan/crypto/prfs/fips_prf.h b/src/libstrongswan/crypto/prfs/fips_prf.h
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+++ b/src/libstrongswan/crypto/prfs/fips_prf.h
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+/**
+ * @file fips_prf.h
+ * 
+ * @brief Interface of fips_prf_t.
+ * 
+ */
+
+/*
+ * Copyright (C) 2006 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.
+ */
+
+#ifndef FIPS_PRF_H_
+#define FIPS_PRF_H_
+
+typedef struct fips_prf_t fips_prf_t;
+
+#include <library.h>
+#include <crypto/prfs/prf.h>
+#include <crypto/hashers/hasher.h>
+
+/**
+ * @brief Implementation of prf_t using the FIPS 186-2-change1 standard.
+ *
+ * FIPS defines a "General Purpose Random Number Generator" (Revised
+ * Algorithm for Computing m values of x (Appendix 3.1 of FIPS 186-2)). This
+ * implementation is not intended for private key generation and therefore does
+ * not include the "mod q" operation (see FIPS 186-2-change1 p74).
+ * The FIPS PRF is stateful; the key changes every time when bytes are acquired.
+ *
+ * @b Constructors:
+ *  - fips_prf_create()
+ *  - prf_create() using one of the FIPS algorithms
+ * 
+ * @ingroup prfs
+ */
+struct fips_prf_t {
+	
+	/**
+	 * Generic prf_t interface for this fips_prf_t class.
+	 */
+	prf_t prf_interface;
+};
+
+/**
+ * @brief Creates a new fips_prf_t object.
+ * 
+ * FIPS 186-2 defines G() functions used in the PRF function. It can
+ * be implemented either based on SHA1 or DES.
+ *
+ * @param b		size of b (in bytes, not bits)
+ * @param g		G() function to use (e.g. g_sha1)
+ * @return
+ *				- fips_prf_t object
+ *				- NULL if b invalid not supported
+ * 
+ * @ingroup prfs
+ */
+fips_prf_t *fips_prf_create(size_t b, void(*g)(u_int8_t[],chunk_t,u_int8_t[]));
+
+/**
+ * @brief Implementation of the G() function based on SHA1.
+ *
+ * @param t		initialization vector for SHA1 hasher, 20 bytes long
+ * @param c		value to hash, not longer than 512 bit
+ * @param res	result of G(), requries 20 bytes
+ */
+void g_sha1(u_int8_t t[], chunk_t c, u_int8_t res[]);
+
+#endif /* FIPS_PRF_H_ */