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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 ntru_poly ntru_poly
* @{ @ingroup ntru_p
*/
#ifndef NTRU_POLY_H_
#define NTRU_POLY_H_
typedef struct ntru_poly_t ntru_poly_t;
#include <library.h>
#include <crypto/xofs/xof.h>
/**
* Implements a trinary polynomial storing the indices of non-zero coefficients
*/
struct ntru_poly_t {
/**
* Get the size of the indices array
*
* @return number of indices
*/
size_t (*get_size)(ntru_poly_t *this);
/**
* @return array containing the indices of the non-zero coefficients
*/
uint16_t* (*get_indices)(ntru_poly_t *this);
/**
* @param array array containing all N coefficients of the polynomial
*/
void (*get_array)(ntru_poly_t *this, uint16_t *array);
/**
* Multiply polynomial a with ntru_poly_t object b having sparse coeffients
* to form result polynomial c = a * b
*
* @param a input polynomial a
* @param b output polynomial c
*/
void (*ring_mult)(ntru_poly_t *this, uint16_t *a, uint16_t *c);
/**
* Destroy ntru_poly_t object
*/
void (*destroy)(ntru_poly_t *this);
};
/**
* Create a trits polynomial from a seed using MGF1
*
* @param alg MGF1 algorithm used(XOF_MGF1_SHA1 or XOF_MGF_SHA256)
* @param seed seed used by MGF1 to generate trits from
* @param N ring dimension, number of polynomial coefficients
* @param q large modulus
* @param c_bits number of bits for candidate index
* @param indices_len_p number of indices for +1 coefficients
* @param indices_len_m number of indices for -1 coefficients
* @param is_product_form generate multiple polynomials
*/
ntru_poly_t *ntru_poly_create_from_seed(ext_out_function_t alg, chunk_t seed,
uint8_t c_bits, uint16_t N, uint16_t q,
uint32_t indices_len_p,
uint32_t indices_len_m,
bool is_product_form);
/**
* Create a trits polynomial from an array of indices of non-zero coefficients
*
* @param data array of indices of non-zero coefficients
* @param N ring dimension, number of polynomial coefficients
* @param q large modulus
* @param indices_len_p number of indices for +1 coefficients
* @param indices_len_m number of indices for -1 coefficients
* @param is_product_form generate multiple polynomials
*/
ntru_poly_t *ntru_poly_create_from_data(uint16_t *data, uint16_t N, uint16_t q,
uint32_t indices_len_p,
uint32_t indices_len_m,
bool is_product_form);
#endif /** NTRU_POLY_H_ @}*/
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