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diff --git a/src/libstrongswan/crypto/mgf1/mgf1_bitspender.h b/src/libstrongswan/crypto/mgf1/mgf1_bitspender.h
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+++ b/src/libstrongswan/crypto/mgf1/mgf1_bitspender.h
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+/*
+ * Copyright (C) 2014 Andreas Steffen
+ * HSR 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 mgf1_bitspender mgf1_bitspender
+ * @{ @ingroup mgf1
+ */
+
+#ifndef MGF1_BITSPENDER_H_
+#define MGF1_BITSPENDER_H_
+
+#include <library.h>
+#include <crypto/hashers/hasher.h>
+
+typedef struct mgf1_bitspender_t mgf1_bitspender_t;
+
+/**
+ * Generates a given number of pseudo-random bits at a time using MGF1
+ */
+struct mgf1_bitspender_t {
+
+	/**
+	 * Get pseudo-random bits
+	 *
+	 * @param bits_needed	Number of needed bits (1..32)
+	 * @param bits			Pseudo-random bits
+	 * @result				FALSE if internal MGF1 error occurred
+	 */
+	bool (*get_bits)(mgf1_bitspender_t *this, int bits_needed, uint32_t *bits);
+
+	/**
+	 * Get a pseudo-random byte
+	 *
+	 * @param byte			Pseudo-random byte
+	 * @result				FALSE if internal MGF1 error occurred
+	 */
+	bool (*get_byte)(mgf1_bitspender_t *this, uint8_t *byte);
+
+	/**
+	 * Destroy mgf1_bitspender_t object
+	 */
+	void (*destroy)(mgf1_bitspender_t *this);
+};
+
+/**
+ * Create a mgf1_bitspender_t object
+ *
+ * @param alg				Hash algorithm to be used with MGF1
+ * @param seed				Seed used to initialize MGF1
+ * @param hash_seed			Hash seed before using it as a seed for MFG1
+ */
+mgf1_bitspender_t *mgf1_bitspender_create(hash_algorithm_t alg, chunk_t seed,
+										  bool hash_seed);
+
+#endif /** MGF1_BITSPENDER_H_ @}*/