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diff --git a/Source/charon/transforms/diffie_hellman.h b/Source/charon/transforms/diffie_hellman.h
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+/**
+ * @file diffie_hellman.h
+ * 
+ * @brief Class to represent a diffie hellman exchange.
+ * 
+ */
+
+/*
+ * 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 DIFFIE_HELLMAN_H_
+#define DIFFIE_HELLMAN_H_
+
+#include "../types.h"
+
+/**
+ * Object representing a diffie hellman exchange
+ * 
+ */
+typedef struct diffie_hellman_s diffie_hellman_t;
+
+struct diffie_hellman_s {
+		
+	/**
+	 * @brief Returns the shared secret of this diffie hellman exchange
+	 * 	
+	 * @warning Space for returned secret is allocated and has to get freed by the caller
+	 * 
+	 * @param this 			calling diffie_hellman_t object
+	 * @param[out] secret 	shared secret will be written into this chunk
+	 * @return 				
+	 * 						- SUCCESS
+	 * 						- FAILED if not both DH values are set
+	 * 						- OUT_OF_RES if out of ressources
+	 */
+	status_t (*get_shared_secret) (diffie_hellman_t *this, chunk_t *secret);
+	
+	/**
+	 * @brief Sets the public value of partner
+	 * 	
+	 * @warning chunk gets copied
+	 * 
+	 * @param this 			calling diffie_hellman_t object
+	 * @param public_value 	public value of partner
+	 * @return 				
+	 * 						- SUCCESS
+	 * 						- OUT_OF_RES if out of ressources
+	 */
+	status_t (*set_other_public_value) (diffie_hellman_t *this, chunk_t public_value);
+	
+	/**
+	 * @brief Gets the public value of partner
+	 * 	
+	 * @warning chunk gets copied
+	 * 
+	 * @param this 				calling diffie_hellman_t object
+	 * @param[out] public_value 	public value of partner is stored at this location
+	 * @return 				
+	 * 							- SUCCESS
+	 * 							- OUT_OF_RES if out of ressources
+	 * 							- FAILED if other public value not set
+	 */
+	status_t (*get_other_public_value) (diffie_hellman_t *this, chunk_t *public_value);
+	
+	/**
+	 * @brief Gets the public value of caller
+	 * 	
+	 * @warning chunk gets copied
+	 * 
+	 * @param this 				calling diffie_hellman_t object
+	 * @param[out] public_value 	public value of caller is stored at this location
+	 * @return 				
+	 * 							- SUCCESS
+	 * 							- OUT_OF_RES if out of ressources
+	 */
+	status_t (*get_my_public_value) (diffie_hellman_t *this, chunk_t *public_value);
+
+	/**
+	 * @brief Destroys an diffie_hellman_t object.
+	 *
+	 * @param this 	diffie_hellman_t object to destroy
+	 * @return 		
+	 * 				SUCCESS in any case
+	 */
+	status_t (*destroy) (diffie_hellman_t *this);
+};
+
+/**
+ * Creates a new diffie_hellman_t object
+ * 
+ * The first diffie hellman public value gets automatically created
+ * 
+ * @param dh_group_number	Diffie Hellman group number to use
+ * @return
+ * 							- diffie_hellman_t if successfully
+ * 							- NULL if out of ressources or dh_group not supported
+ */
+diffie_hellman_t *diffie_hellman_create(u_int16_t dh_group_number);
+
+#endif /*DIFFIE_HELLMAN_H_*/