123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
/**
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* @file randomizer.h
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*
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* @brief Interface of randomizer_t.
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#ifndef RANDOMIZER_H_
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#define RANDOMIZER_H_
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#include <types.h>
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/**
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* Default random device used when no device is given.
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*/
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#define DEFAULT_RANDOM_DEVICE "/dev/random"
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/**
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* Pseudo random device used when no device is given.
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*/
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#define DEFAULT_PSEUDO_RANDOM_DEVICE "/dev/urandom"
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typedef struct randomizer_t randomizer_t;
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/**
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* @brief Class used to get random and pseudo random values.
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*
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* This class is thread save as file system read calls are thread save.
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*
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* @b Constructors:
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* - randomizer_create()
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* - randomizer_create_on_devices()
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*
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* @ingroup utils
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*/
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struct randomizer_t {
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/**
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* @brief Reads a specific number of bytes from random device.
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*
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* @param this calling randomizer_t object
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* @param bytes number of bytes to read
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* @param[out] buffer pointer to buffer where to write the data in.
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* Size of buffer has to be at least bytes.
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*/
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void (*get_random_bytes) (randomizer_t *this,size_t bytes, u_int8_t *buffer);
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/**
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* @brief Allocates space and writes in random bytes.
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*
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* @param this calling randomizer_t object
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* @param bytes number of bytes to allocate
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* @param[out] chunk chunk which will hold the allocated random bytes
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*/
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void (*allocate_random_bytes) (randomizer_t *this, size_t bytes, chunk_t *chunk);
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/**
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* @brief Reads a specific number of bytes from pseudo random device.
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*
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* @param this calling randomizer_t object
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* @param bytes number of bytes to read
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* @param[out] buffer pointer to buffer where to write the data in.
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* size of buffer has to be at least bytes.
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*/
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void (*get_pseudo_random_bytes) (randomizer_t *this,size_t bytes, u_int8_t *buffer);
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/**
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* @brief Allocates space and writes in pseudo random bytes.
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*
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* @param this calling randomizer_t object
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* @param bytes number of bytes to allocate
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* @param[out] chunk chunk which will hold the allocated random bytes
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*/
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void (*allocate_pseudo_random_bytes) (randomizer_t *this, size_t bytes, chunk_t *chunk);
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/**
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* @brief Destroys a randomizer_t object.
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*
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* @param this randomizer_t object to destroy
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*/
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void (*destroy) (randomizer_t *this);
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};
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/**
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* @brief Creates a randomizer_t object
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*
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* @return
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* - created randomizer_t, or
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* - NULL if failed
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*
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* @ingroup utils
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*/
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randomizer_t *randomizer_create();
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/**
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* @brief Creates an randomizer_t object with specific random device names.
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*
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* @param random_dev_name device name for random values, etc /dev/random
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* @param prandom_dev_name device name for pseudo random values, etc /dev/urandom
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* @return randomizer_t object
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*
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* @ingroup utils
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*/
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randomizer_t *randomizer_create_on_devices(char * random_dev_name,char * prandom_dev_name);
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#endif /*RANDOMIZER_H_*/
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