- implementation supporting SHA1

- UNtested
2005-11-22 07:45:49 +00:00
parent d532165026
commit 781fadcc33
2 changed files with 302 additions and 0 deletions
@@ -0,0 +1,90 @@
+/**
+ * @file hmac.h
+ * 
+ * @brief Implementation of message authentication
+ * using cryptographic hash functions (HMAC). See RFC2104.
+ * 
+ */
+
+/*
+ * 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 HMAC_H_
+#define HMAC_H_
+
+
+#include "hashers/hasher.h"
+
+
+/**
+ * Object representing a hmac
+ */
+typedef struct hmac_s hmac_t;
+
+struct hmac_s {
+	/**
+	 * @brief Generate message authentication code.
+	 * 
+	 * @param this			calling hmac
+	 * @param data			chunk of data to authenticate
+	 * @param [out]buffer	pointer where the generated bytes will be written
+	 * @return				
+	 * 						- SUCCESS in any case
+	 */
+	status_t (*get_mac) (hmac_t *this, chunk_t data, u_int8_t *buffer);
+	
+	/**
+	 * @brief Generates message authentication code and 
+	 * allocate space for them.
+	 * 
+	 * @param this			calling hmac
+	 * @param data			chunk of data to authenticate
+	 * @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_mac) (hmac_t *this, chunk_t data, chunk_t *chunk);
+	
+	/**
+	 * @brief get the block size of this hmac
+	 * 
+	 * @param this			calling hmac
+	 * @return				block size in bytes
+	 */
+	size_t (*get_block_size) (hmac_t *this);
+	
+	/**
+	 * @brief Destroys a hmac object.
+	 *
+	 * @param this 	hmac_t object to destroy
+	 * @return 		
+	 * 				SUCCESS in any case
+	 */
+	status_t (*destroy) (hmac_t *this);
+};
+
+/**
+ * Creates a new hmac_t object
+ * 
+ * @param hash_algorithm		hash algorithm to use
+ * @param key					A chunk containing the key
+ * @return
+ *								- hmac_t if successfully
+ *								- NULL if out of ressources or hash not supported
+ */
+hmac_t *hmac_create(hash_algorithm_t hash_algorithm, chunk_t key);
+
+#endif /*HMAC_H_*/