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/*
* Copyright (C) 2014-2016 Andreas Steffen
* HSR 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.
*/
/**
* @defgroup xof_bitspender xof_bitspender
* @{ @ingroup mgf1
*/
#ifndef XOF_BITSPENDER_H_
#define XOF_BITSPENDER_H_
#include "xof.h"
#include <library.h>
typedef struct xof_bitspender_t xof_bitspender_t;
/**
* Generates a given number of pseudo-random bits at a time using an
* Extended Output Function (XOF)
*/
struct xof_bitspender_t {
/**
* Get pseudo-random bits
*
* @param bits_needed Number of needed bits (1..32)
* @param bits Pseudo-random bits
* @result FALSE if internal MGF1 error occurred
*/
bool (*get_bits)(xof_bitspender_t *this, int bits_needed, uint32_t *bits);
/**
* Get a pseudo-random byte
*
* @param byte Pseudo-random byte
* @result FALSE if internal MGF1 error occurred
*/
bool (*get_byte)(xof_bitspender_t *this, uint8_t *byte);
/**
* Destroy xof_bitspender_t object
*/
void (*destroy)(xof_bitspender_t *this);
};
/**
* Create a xof_bitspender_t object
*
* @param alg XOF to be used
* @param seed Seed used to initialize XOF
* @param hash_seed Hash seed before using it as a seed for MFG1
*/
xof_bitspender_t *xof_bitspender_create(ext_out_function_t alg, chunk_t seed,
bool hash_seed);
#endif /** XOF_BITSPENDER_H_ @}*/
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