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/**
* @file gmp_helper.h
*
* @brief Interface of gmp_helper_t.
*
*/
/*
* Copyright (C) 1997 Angelos D. Keromytis.
* Copyright (C) 2005 Jan Hutter, Martin Willi
* 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.
*/
#ifndef GMP_HELPER_H_
#define GMP_HELPER_H_
#include <gmp.h>
#include <types.h>
typedef struct gmp_helper_t gmp_helper_t;
/**
* @brief Class with helper functions to manipulate gmp values.
*
* @ingroup utils
*/
struct gmp_helper_t {
/**
* Initialize an mpz_t to a random prime of specified size.
*
*
* @param this calling object
* @param[out] var pointer to mpz_t variable to initialize
* @param[in] bytes length of given prime in bytes
* @return
* - SUCCCESS
* - OUT_OF_RES
*/
status_t (*init_prime) (gmp_helper_t *this, mpz_t *var, int bytes);
/**
* Initialize an mpz_t to a random prime of specified size without using gmp
* next prime function.
*
*
* @param this calling object
* @param[out] var mpz_t variable to initialize
* @param[in] bytes length of given prime in bytes
* @return
* - SUCCCESS
* - FAILED if length of prime not as asked. Try again.
* - OUT_OF_RES
*/
status_t (*init_prime_fast) (gmp_helper_t *this, mpz_t *prime, int bytes);
/**
* Convert network form (binary bytes, big-endian) to mpz_t of gmp library.
*
* The given mpz_t gets initialized in this function.
*
* @param this calling private_gmp_helper_t object
* @param mpz_value pointer to a mpz_t value
* @param data chunk_t containing the network form of data
*/
void (*chunk_to_mpz) (gmp_helper_t *this,mpz_t *mpz_value, chunk_t data);
/**
* Convert mpz_t to network form (binary bytes, big-endian).
*
* @param this calling private_gmp_helper_t object
* @param mpz_value mpz_value to convert
* @param data chunk_t where the data are written to
* @param bytes number of bytes to copy
*
* @return
* - SUCCESS
* - OUT_OF_RES
* - FAILED if mpz_t value was longer then given bytes count
*/
status_t (*mpz_to_chunk) (gmp_helper_t *this,mpz_t *mpz_value, chunk_t *data,size_t bytes);
/**
* @brief Destroys an gmp_helper_t object.
*
* @param this gmp_helper_t object to destroy
* @return SUCCESS in any case
*/
status_t (*destroy) (gmp_helper_t *this);
};
/**
* Creates a new gmp_helper_t object
*
* @return
* - gmp_helper_t object
* - NULL if out of ressources
*
* @ingroup utils
*/
gmp_helper_t *gmp_helper_create();
#endif /*GMP_HELPER_H_*/
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