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/*
* Copyright (C) 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 newhope_noise newhope_noise
* @{ @ingroup newhope_p
*/
#ifndef NEWHOPE_NOISE_H_
#define NEWHOPE_NOISE_H_
typedef struct newhope_noise_t newhope_noise_t;
#include <library.h>
/**
* Generate pseudo random noise using a ChaCha20 stream
* initialized with a 256 bit seed and an 8 bit nonce
*/
struct newhope_noise_t {
/**
* Return n pseudo random bytes with a uniform distribution
*
* @param nonce Nonce determining the pseudo random stream
* @param n Number of pseudo random bytes to be returned
* @return Return array with n peudo random bytes
*/
uint8_t* (*get_uniform_bytes)(newhope_noise_t *this, uint8_t nonce,
uint16_t n);
/**
* Return n pseudo random 32-bit words with a Psi16 binomial distribution
*
* @param nonce Nonce determining the pseudo random stream
* @param n Number of pseudo random Psi16 words to be returned
* @param q Prime number q determining the ring
* @return Return array with n pseudo random 32 bit words
*/
uint32_t* (*get_binomial_words)(newhope_noise_t *this, uint8_t nonce,
uint16_t n, uint16_t q);
/**
* Destroy a newhope_noise_t object
*/
void (*destroy)(newhope_noise_t *this);
};
/**
* Creates a new newhope_noise_t object.
*
* @param seed 256 bit seed (32 byte chunk)
* @return newhope_noise_t object, NULL if not supported
*/
newhope_noise_t *newhope_noise_create(chunk_t seed);
#endif /** NEWHOPE_NOISE_H_ @}*/
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