154 lines
3.8 KiB
C
154 lines
3.8 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_keypair.h
|
|
* Header for internal API of ntru_keypair.c.
|
|
* @brief header for ntru_keypair.c
|
|
*/
|
|
|
|
#ifndef NTRU_KEYPAIR_H
|
|
#define NTRU_KEYPAIR_H
|
|
|
|
|
|
#include "ntru_params.h"
|
|
|
|
#include <fmpz_poly.h>
|
|
#include <fmpz.h>
|
|
#include <stdbool.h>
|
|
|
|
|
|
typedef struct keypair keypair;
|
|
|
|
|
|
/**
|
|
* This struct holds the keypair,
|
|
* both private and public components.
|
|
*/
|
|
struct keypair {
|
|
/**
|
|
* First part of the private key,
|
|
* a random polynom.
|
|
*/
|
|
fmpz_poly_t priv;
|
|
/**
|
|
* Second part of the private key,
|
|
* the priv polynom inverted.
|
|
*/
|
|
fmpz_poly_t priv_inv;
|
|
/**
|
|
* The public key, computed as:
|
|
* h = p * (Fq * g) mod q
|
|
*/
|
|
fmpz_poly_t pub;
|
|
};
|
|
|
|
|
|
/**
|
|
* Creates an NTRU key pair,
|
|
* consisting of public and private
|
|
* components.
|
|
*
|
|
* @param pair store private and public components here (the
|
|
* polynomials inside the struct will be automatically
|
|
* initialized) [out]
|
|
* @param f a random ternary polynomial
|
|
* @param g a random ternary polynomial
|
|
* @param params the NTRU context
|
|
* @return true for success, false if f or g are not invertible
|
|
* (then the caller has to try different ones)
|
|
*/
|
|
bool
|
|
ntru_create_keypair(
|
|
keypair *pair,
|
|
const fmpz_poly_t f,
|
|
const fmpz_poly_t g,
|
|
const ntru_params *params);
|
|
|
|
/**
|
|
* Export the public key to a file.
|
|
*
|
|
* @param filename the file to save the public key into
|
|
* @param pub the public key
|
|
* @param params the NTRU context
|
|
* @return true for success, false if any of the file operations failed
|
|
*/
|
|
bool
|
|
export_public_key(char const * const filename,
|
|
const fmpz_poly_t pub,
|
|
const ntru_params *params);
|
|
|
|
/**
|
|
* Export the private key to a file.
|
|
*
|
|
* @param filename the file to save the private key into
|
|
* @param priv the private key
|
|
* @param params the NTRU context
|
|
* @return true for success, false if any of the file operations failed
|
|
*/
|
|
bool
|
|
export_priv_key(char const * const filename,
|
|
const fmpz_poly_t priv,
|
|
const ntru_params *params);
|
|
|
|
/**
|
|
* Import the public key from a file.
|
|
*
|
|
* @param pub where to save the public key, must be initialized [out]
|
|
* @param filename the file to get the public key from
|
|
* @param params the NTRU context
|
|
* @return true for success, false if any of the file operations failed
|
|
*/
|
|
bool
|
|
import_public_key(fmpz_poly_t pub,
|
|
char const * const filename,
|
|
const ntru_params *params);
|
|
|
|
/**
|
|
* Import the private key from a file and store him
|
|
* along with his inverse.
|
|
*
|
|
* @param priv where to save the private key, must be initialized [out]
|
|
* @param priv_inv where to save the inverse of the private key,
|
|
* must be initialized [out]
|
|
* @param filename the file to get the private key from
|
|
* @param params the NTRU context
|
|
* @return true for success, false if any of the file operations failed
|
|
*/
|
|
bool
|
|
import_priv_key(fmpz_poly_t priv,
|
|
fmpz_poly_t priv_inv,
|
|
char const * const filename,
|
|
const ntru_params *params);
|
|
|
|
/**
|
|
* Used to free the inner structure
|
|
* of a keypair. This will not call free()
|
|
* on the pair itself.
|
|
*
|
|
* @param pair the pair to free the inner structure of
|
|
*/
|
|
void
|
|
ntru_delete_keypair(keypair *pair);
|
|
|
|
|
|
#endif /* NTRU_KEYPAIR_H */
|