107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
/*
|
|
* Copyright (C) 2014 FH Bielefeld
|
|
*
|
|
* This file is part of a FH Bielefeld project.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
|
* MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file ntru_encrypt.c
|
|
* This file handles the NTRU encryption
|
|
* algorithm.
|
|
* @brief NTRU encryption
|
|
*/
|
|
|
|
#include "ntru_ascii_poly.h"
|
|
#include "ntru_encrypt.h"
|
|
#include "ntru_mem.h"
|
|
#include "ntru_params.h"
|
|
#include "ntru_poly.h"
|
|
#include "ntru_poly_ascii.h"
|
|
#include "ntru_string.h"
|
|
|
|
#include <string.h>
|
|
|
|
#include <fmpz_poly.h>
|
|
#include <fmpz.h>
|
|
|
|
|
|
/*------------------------------------------------------------------------*/
|
|
|
|
void
|
|
ntru_encrypt_poly(
|
|
fmpz_poly_t out,
|
|
const fmpz_poly_t msg_bin,
|
|
const fmpz_poly_t pub_key,
|
|
const fmpz_poly_t rnd,
|
|
const ntru_params *params)
|
|
{
|
|
fmpz_poly_t tmp_poly_msg;
|
|
|
|
if (!msg_bin || !pub_key || !rnd || !out || !params)
|
|
NTRU_ABORT_DEBUG("Unexpected NULL parameters");
|
|
|
|
/* allow aliasing */
|
|
fmpz_poly_init(tmp_poly_msg);
|
|
fmpz_poly_set(tmp_poly_msg, msg_bin);
|
|
|
|
fmpz_poly_zero(out);
|
|
poly_starmultiply(out, pub_key, rnd, params, params->q);
|
|
|
|
fmpz_poly_add(out, out, tmp_poly_msg);
|
|
fmpz_poly_mod_unsigned(out, params->q);
|
|
|
|
fmpz_poly_clear(tmp_poly_msg);
|
|
}
|
|
|
|
/*------------------------------------------------------------------------*/
|
|
|
|
string *
|
|
ntru_encrypt_string(
|
|
const string *msg,
|
|
const fmpz_poly_t pub_key,
|
|
const fmpz_poly_t rnd,
|
|
const ntru_params *params)
|
|
{
|
|
uint32_t i = 0;
|
|
string *enc_msg;
|
|
fmpz_poly_t **poly_array;
|
|
|
|
if (!msg || !msg->len)
|
|
NTRU_ABORT_DEBUG("Unexpected NULL parameters");
|
|
|
|
poly_array = ascii_to_bin_poly_arr(msg, params);
|
|
|
|
while (*poly_array[i]) {
|
|
ntru_encrypt_poly(*poly_array[i],
|
|
*poly_array[i],
|
|
pub_key,
|
|
rnd,
|
|
params);
|
|
i++;
|
|
}
|
|
|
|
enc_msg = poly_arr_to_base64((const fmpz_poly_t **)poly_array,
|
|
i, params);
|
|
|
|
poly_delete_array(poly_array);
|
|
|
|
return enc_msg;
|
|
}
|
|
|
|
/*------------------------------------------------------------------------*/
|