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diff --git a/Source/lib/crypto/rsa/rsa_public_key.h b/Source/lib/crypto/rsa/rsa_public_key.h
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+/**
+ * @file rsa_public_key.h
+ * 
+ * @brief Interface of rsa_public_key_t.
+ * 
+ */
+
+/*
+ * 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 RSA_PUBLIC_KEY_H_
+#define RSA_PUBLIC_KEY_H_
+
+#include <gmp.h>
+
+#include <types.h>
+#include <definitions.h>
+
+
+typedef struct rsa_public_key_t rsa_public_key_t;
+
+/**
+ * @brief RSA public key with associated functions.
+ * 
+ * Currently only supports signature verification using
+ * the EMSA encoding (see PKCS1)
+ * 
+ * @b Constructors:
+ * - rsa_public_key_create_from_chunk()
+ * - rsa_public_key_create_from_file()
+ * - rsa_private_key_t.get_public_key()
+ * 
+ * @see rsa_private_key_t
+ * 
+ * @todo Implement getkey() and savekey()
+ * 
+ * @ingroup rsa
+ */
+struct rsa_public_key_t {
+
+	/**
+	 * @brief Verify a EMSA-PKCS1 encodined signature.
+	 * 
+	 * Processes the supplied signature with the RSAVP1 function,
+	 * selects the hash algorithm form the resultign ASN1-OID and
+	 * verifies the hash against the supplied data.
+	 * 
+	 * @param this				rsa_public_key to use
+	 * @param data				data to sign
+	 * @param signature			signature to verify
+	 * @return
+	 * 							- SUCCESS, if signature ok
+	 * 							- INVALID_STATE, if key not set
+	 * 							- NOT_SUPPORTED, if hash algorithm not supported
+	 * 							- INVALID_ARG, if signature is not a signature
+	 * 							- FAILED if signature invalid or unable to verify
+	 */
+	status_t (*verify_emsa_pkcs1_signature) (rsa_public_key_t *this, chunk_t data, chunk_t signature);
+	
+	/**
+	 * @brief Gets the key.
+	 * 
+	 * Currently uses a proprietary format which is only inteded
+	 * for testing. This should be replaced with a proper
+	 * ASN1 encoded key format, when charon gets the ASN1 
+	 * capabilities.
+	 * 
+	 * @param this				calling object
+	 * @param key				key (in a propriarity format)
+	 * @return					
+	 * 							- SUCCESS
+	 * 							- INVALID_STATE, if key not set
+	 */
+	status_t (*get_key) (rsa_public_key_t *this, chunk_t *key);
+	
+	/**
+	 * @brief Saves a key to a file.
+	 * 
+	 * Not implemented!
+	 * 
+	 * @param this				calling object
+	 * @param file				file to which the key should be written.
+	 * @return					NOT_SUPPORTED
+	 */
+	status_t (*save_key) (rsa_public_key_t *this, char *file);
+	
+	/**
+	 * @brief Get the modulus of the key.
+	 * 
+	 * @param this				calling object
+	 * @return					modulus (n) of the key
+	 */
+	mpz_t *(*get_modulus) (rsa_public_key_t *this);
+	
+	/**
+	 * @brief Clone the public key.
+	 * 
+	 * @param this				public key to clone
+	 * @return					clone of this
+	 */
+	rsa_public_key_t *(*clone) (rsa_public_key_t *this);
+	
+	/**
+	 * @brief Destroys the public key.
+	 * 
+	 * @param this				public key to destroy
+	 */
+	void (*destroy) (rsa_public_key_t *this);
+};
+
+/**
+ * @brief Load an RSA public key from a chunk.
+ * 
+ * Load a key from a chunk, encoded in the more frequently
+ * used PublicKeyInfo struct (ASN1 DER encoded).
+ * 
+ * @param chunk				chunk containing the DER encoded key
+ * @return 					loaded rsa_public_key_t, or NULL
+ * 
+ * @todo Check OID in PublicKeyInfo
+ * 
+ * @ingroup rsa
+ */
+rsa_public_key_t *rsa_public_key_create_from_chunk(chunk_t chunk);
+
+/**
+ * @brief Load an RSA public key from a file.
+ * 
+ * Load a key from a file, which is either in binary
+ * format (DER), or in PEM format. 
+ * 
+ * @param filename			filename which holds the key
+ * @return 					loaded rsa_public_key_t, or NULL
+ * 
+ * @todo Implement PEM file loading
+ * 
+ * @ingroup rsa
+ */
+rsa_public_key_t *rsa_public_key_create_from_file(char *filename);
+
+#endif /*RSA_PUBLIC_KEY_H_*/