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diff --git a/Source/charon/utils/gmp_helper.h b/Source/charon/utils/gmp_helper.h
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+/**
+ * @file gmp_helper.c
+ * 
+ * @brief Class with helper functions for gmp operations
+ * 
+ */
+
+/*
+ * Copyright (C) 1997 Angelos D. Keromytis.
+ * Copyright (C) 2005 Jan Hutter, 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 GMP_HELPER_H_
+#define GMP_HELPER_H_
+
+#include <gmp.h>
+
+#include "../types.h"
+
+/**
+ * Class with helper functions to manipulate gmp values 
+ * 
+ */
+typedef struct gmp_helper_s gmp_helper_t;
+
+struct gmp_helper_s {
+
+	/**
+	 * @brief initialize an mpz_t to a random prime of specified size
+	 *
+	 *
+	 * @param			this calling object
+	 * @param[out] var 	mpz_t variable to initialize
+	 * @param[in] 		bytes length of given prime in bytes
+	 * @return 		
+	 * 				- SUCCCESS
+	 * 				- FAILED
+	 * 				- OUT_OF_RES
+	 */
+	status_t (*init_prime) (gmp_helper_t *this, mpz_t *var, int bytes);
+	
+	/* Convert network form (binary bytes, big-endian) to mpz_t of gmp library.
+	 * 
+	 * @param this				calling private_gmp_helper_t object
+	 * @param mpz_value 			pointer to a mpz_t value
+	 * @param data				chunk_t containing the network form of data
+	 */
+	void (*chunk_to_mpz) (gmp_helper_t *this,mpz_t *mpz_value, chunk_t data);
+	
+	/* Convert mpz_t to network form (binary bytes, big-endian).
+	 * 
+	 * @param this				calling private_gmp_helper_t object
+	 * @param mpz_value 			mpz_value to convert
+	 * @param data				chunk_t where the data are written to
+	 * @param bytes				number of bytes to copy 
+	 * 
+	 * @return					
+	 * 							- SUCCESS
+	 * 							- OUT_OF_RES
+	 * 							- FAILED if mpz_t value was longer then given bytes count
+	 */
+	status_t (*mpz_to_chunk) (gmp_helper_t *this,mpz_t *mpz_value, chunk_t *data,size_t bytes);
+
+	/**
+	 * @brief Destroys an gmp_helper_t object.
+	 *
+	 * @param this 	gmp_helper_t object to destroy
+	 * @return 		
+	 * 				SUCCESS in any case
+	 */
+	status_t (*destroy) (gmp_helper_t *this);
+};
+
+/**
+ * Creates a new gmp_helper_t object
+ * 
+ * @return
+ * 							- gmp_helper_t if successfully
+ * 							- NULL if out of ressources
+ */
+gmp_helper_t *gmp_helper_create();
+
+
+#endif /*GMP_HELPER_H_*/