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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 Allocates space and writes in random bytes
*
* @param this calling randomizer_t object
* @param bytes Number of bytes to allocate
* @param[out] chunk chunk which will hold the allocated random bytes
* @return
* - SUCCESS
* - OUT_OF_RES
* - FAILED
*/
status_t (*allocate_random_bytes) (randomizer_t *this, size_t bytes, chunk_t *chunk);
/**
* @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 Allocates space and writes in pseudo random bytes
*
* @param this calling randomizer_t object
* @param bytes Number of bytes to allocate
* @param[out] chunk chunk which will hold the allocated random bytes
* @return
* - SUCCESS
* - OUT_OF_RES
* - FAILED
*/
status_t (*allocate_pseudo_random_bytes) (randomizer_t *this, size_t bytes, chunk_t *chunk);
/**
* @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_*/
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