- randomizer_t written and tested

2005-11-16 08:36:31 +00:00
parent d87cde0e07
commit 7f3824c557
2 changed files with 291 additions and 0 deletions
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+/**
+ * @file randomizer.h
+ * 
+ * @brief Class used to get random and pseudo random values
+ * 
+ */
+
+/*
+ * 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 RANDOMIZER_H_
+#define RANDOMIZER_H_
+
+#include "../types.h"
+
+/**
+ * Object representing an randomizer
+ * 
+ * This class is thread save as file system read calls are thread save...
+ */
+typedef struct randomizer_s randomizer_t;
+
+struct randomizer_s {
+	
+	/**
+	 * @brief Reads a specific number of bytes from random device.
+	 * 
+	 * @param this 					calling randomizer_t object
+	 * @param bytes					Number of bytes to read
+	 * @param[out] buffer			Pointer to buffer where to write the data in.
+	 * 								Size of buffer has to be at least bytes.
+	 * @return
+	 * 								- SUCCESS
+	 * 								- FAILED
+	 */
+	status_t (*get_random_bytes) (randomizer_t *this,size_t bytes, u_int8_t *buffer);
+	
+	/**
+	 * @brief Reads a specific number of bytes from pseudo random device.
+	 * 
+	 * @param this 					calling randomizer_t object
+	 * @param bytes					Number of bytes to read
+	 * @param[out] buffer			Pointer to buffer where to write the data in.
+	 * 								Size of buffer has to be at least bytes.
+	 * @return
+	 * 								- SUCCESS
+	 * 								- FAILED
+	 */
+	status_t (*get_pseudo_random_bytes) (randomizer_t *this,size_t bytes, u_int8_t *buffer);
+
+
+	/**
+	 * @brief Destroys a randomizer_t object.
+	 *
+	 * @param this 	randomizer_t object to destroy
+	 * @return 		
+	 * 				SUCCESS in any case
+	 */
+	status_t (*destroy) (randomizer_t *this);
+};
+
+/**
+ * @brief Create an randomizer_t object
+ * 
+ * @return			
+ * 					- created randomizer_t, or
+ * 					- NULL if failed
+ */
+randomizer_t *randomizer_create();
+
+/**
+ * @brief Create an randomizer_t object with specific random device names
+ * 
+ * @param random_dev_name	Device name for random values, etc /dev/random
+ * @param prandom_dev_name	Device name for pseudo random values, etc /dev/urandom
+ * @return					
+ *	 						- created randomizer_t, or
+ * 							- NULL if failed
+ */
+randomizer_t *randomizer_create_on_devices(char * random_dev_name,char * prandom_dev_name);
+
+#endif /*RANDOMIZER_H_*/