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diff --git a/Source/charon/transforms/signers/signer.h b/Source/charon/transforms/signers/signer.h
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+++ b/Source/charon/transforms/signers/signer.h
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+/**
+ * @file signer.h
+ * 
+ * @brief Generic interface for integrity algorithms
+ * 
+ */
+
+/*
+ * 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 SIGNER_H_
+#define SIGNER_H_
+
+#include "../../payloads/transform_substructure.h"
+
+
+/**
+ * Object representing a diffie hellman exchange
+ */
+typedef struct signer_s signer_t;
+
+struct signer_s {
+	/**
+	 * @brief generates pseudo random bytes and writes them
+	 * in the buffer
+	 * 
+	 * @param this			calling signer
+	 * @param seed			a chunk containing the seed for the next bytes
+	 * @param [out]buffer	pointer where the generated bytes will be written
+	 * @return				
+	 * 						- SUCCESS in any case
+	 */
+	status_t (*get_signature) (signer_t *this, chunk_t data, u_int8_t *buffer);
+	
+	/**
+	 * @brief generates pseudo random bytes and allocate space for them
+	 * 
+	 * @param this			calling signer
+	 * @param seed			a chunk containing the seed for the next bytes
+	 * @param [out]chunk	chunk which will hold generated bytes
+	 * @return				
+	 * 						- SUCCESS in any case
+	 * 						- OUT_OF_RES if space could not be allocated
+	 */
+	status_t (*allocate_signature) (signer_t *this, chunk_t data, chunk_t *chunk);
+	
+	/**
+	 * @brief generates pseudo random bytes and writes them
+	 * in the buffer
+	 * 
+	 * @param this			calling signer
+	 * @param seed			a chunk containing the seed for the next bytes
+	 * @param [out]buffer	pointer where the generated bytes will be written
+	 * @return				
+	 * 						- SUCCESS in any case
+	 */
+	status_t (*verify_signature) (signer_t *this, chunk_t data, chunk_t signature, bool *valid);
+	
+	/**
+	 * @brief get the block size of this signer
+	 * 
+	 * @param this			calling signer
+	 * @return				block size in bytes
+	 */
+	size_t (*get_block_size) (signer_t *this);
+	
+	/**
+	 * @brief Set the key for this signer
+	 * 
+	 * @param this			calling signer
+	 * @return				block size in bytes
+	 */
+	status_t (*set_key) (signer_t *this, chunk_t key);
+	
+	/**
+	 * @brief Destroys a signer object.
+	 *
+	 * @param this 	signer_t object to destroy
+	 * @return 		
+	 * 				SUCCESS in any case
+	 */
+	status_t (*destroy) (signer_t *this);
+};
+
+/**
+ * Creates a new signer_t object
+ * 
+ * @param pseudo_random_function	Algorithm to use
+ * @return
+ * 									- signer_t if successfully
+ * 									- NULL if out of ressources or signer not supported
+ */
+signer_t *signer_create(integrity_algorithm_t integrity_algorithm);
+
+#endif /*SIGNER_H_*/