- skeletons for:

- prf - prf_hmac_sha1 - hasher - hasher_sha1
2005-11-21 16:26:36 +00:00
parent e0d6093976
commit f0d14d2c56
8 changed files with 516 additions and 0 deletions
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+/**
+ * @file hasher.h
+ * 
+ * @brief Generic interface for hash functions
+ * 
+ */
+
+/*
+ * 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 HASHER_H_
+#define HASHER_H_
+
+
+#include "../../types.h"
+
+/**
+ * algorithms to use for hashing
+ */
+typedef enum hash_algorithm_e hash_algorithm_t;
+
+enum hash_algorithm_e {
+	SHA1,
+	MD5
+};
+
+
+/**
+ * Object representing a hasher
+ */
+typedef struct hasher_s hasher_t;
+
+struct hasher_s {
+	/**
+	 * @brief hash data and write it in the buffer
+	 * 
+	 * @param this			calling hasher
+	 * @param data			data to hash
+	 * @param [out]buffer	pointer where the hash will be written
+	 * @return				
+	 * 						- SUCCESS in any case
+	 */
+	status_t (*get_hash) (hasher_t *this, chunk_t data, u_int8_t *buffer);
+	
+	/**
+	 * @brief hash data and allocate space for the hash
+	 * 
+	 * @param this			calling hasher
+	 * @param seed			a chunk containing the seed for the next bytes
+	 * @param [out]hash		chunk which will hold allocated hash
+	 * @return				
+	 * 						- SUCCESS in any case
+	 * 						- OUT_OF_RES if space could not be allocated
+	 */
+	status_t (*allocate_hash) (hasher_t *this, chunk_t data, chunk_t *hash);
+	
+	/**
+	 * @brief get the block size of this hashing function
+	 * 
+	 * @param this			calling hasher
+	 * @return				block size in bytes
+	 */
+	size_t (*get_block_size) (hasher_t *this);
+	
+	/**
+	 * @brief Destroys a hasher object.
+	 *
+	 * @param this 	hasher_t object to destroy
+	 * @return 		
+	 * 				SUCCESS in any case
+	 */
+	status_t (*destroy) (hasher_t *this);
+};
+
+/**
+ * Creates a new hasher_t object
+ * 
+ * @param hash_algorithm			Algorithm to use for hashing
+ * @return
+ * 									- hasher_t if successfully
+ * 									- NULL if out of ressources 
+ */
+hasher_t *hasher_create(hash_algorithm_t hash_algorithm);
+
+#endif /*HASHER_H_*/