pqc/src/decrypt.h

81 lines
2.3 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 decrypt.h
* Header for the external API of decrypt.c.
* @brief header for decrypt.c
*/
#ifndef NTRU_DECRYPT_H
#define NTRU_DECRYPT_H
#include "ntru_string.h"
#include "params.h"
#include "poly.h"
#include <stdbool.h>
#include <fmpz_poly.h>
#include <fmpz.h>
/**
* Decryption of the given Polynom with the private key, its inverse
* and the fitting ntru_params
*
* @param encr_msg encrypted polynom with maximum length of N from
* the given context
* @param priv_key the polynom containing the private key to decrypt
* the message
* @param priv_key_inv the inverse polynome to the private key
* @param out_tern the resulting ternary polynom [out]
* @param params the ntru_params
* @return true/false for success/failure
*/
bool
ntru_decrypt_poly(
const fmpz_poly_t encr_msg,
const fmpz_poly_t priv_key,
const fmpz_poly_t priv_key_inv,
fmpz_poly_t out_tern,
const ntru_params *params);
/**
* Decryption of a given encrypted string.
*
* @param encr_msg the encrypted message in the form of a string
* @param priv_key the polynom containing the private key to decrypt
* the message
* @param priv_key_inv the inverse polynome to the private key
* @param params the ntru_params
* @return the decrypted string or NULL on failure
*/
string *
ntru_decrypt_string(
const string *encr_msg,
const fmpz_poly_t priv_key,
const fmpz_poly_t priv_key_inv,
const ntru_params *params);
#endif /* NTRU_DECRYPT */