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/**
* @file prf.h
*
* @brief Generic interface for pseudo-random-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 PRF_H_
#define PRF_H_
#include "../../payloads/transform_substructure.h"
/**
* Object representing a diffie hellman exchange
*/
typedef struct prf_s prf_t;
struct prf_s {
/**
* @brief generates pseudo random bytes and writes them
* in the buffer
*
* @param this calling prf
* @param seed a chunk containing the seed for the next bytes
* @param [out]buffer pointer where the generated bytes will be written
* @return
* - SUCCESS in any case
*/
status_t (*get_bytes) (prf_t *this, chunk_t seed, u_int8_t *buffer);
/**
* @brief generates pseudo random bytes and allocate space for them
*
* @param this calling prf
* @param seed a chunk containing the seed for the next bytes
* @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_bytes) (prf_t *this, chunk_t seed, chunk_t *chunk);
/**
* @brief get the block size of this prf
*
* @param this calling prf
* @return block size in bytes
*/
size_t (*get_block_size) (prf_t *this);
/**
* @brief Destroys a prf object.
*
* @param this prf_t object to destroy
* @return
* SUCCESS in any case
*/
status_t (*destroy) (prf_t *this);
};
/**
* Creates a new prf_t object
*
* @param pseudo_random_function Algorithm to use
* @param key A chunk containing the key
* @return
* - prf_t if successfully
* - NULL if out of ressources or prf not supported
*/
prf_t *prf_create(pseudo_random_function_t pseudo_random_function, chunk_t key);
#endif /*PRF_H_*/
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