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/* bignum.h
*
* bignum operations that are missing from gmp.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 Niels Möller
*
* The nettle 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.
*
* The nettle 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 the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#ifndef NETTLE_BIGNUM_H_INCLUDED
#define NETTLE_BIGNUM_H_INCLUDED
#include "nettle-meta.h"
#include <gmp.h>
#include "nettle-types.h"
/* Size needed for signed encoding, including extra sign byte if
* necessary. */
unsigned
nettle_mpz_sizeinbase_256_s(const mpz_t x);
/* Size needed for unsigned encoding */
unsigned
nettle_mpz_sizeinbase_256_u(const mpz_t x);
/* Writes an integer as length octets, using big endian byte order,
* and two's complement for negative numbers. */
/* FIXME: Change order of arguments, putting the mpz_t first? */
void
nettle_mpz_get_str_256(unsigned length, uint8_t *s, const mpz_t x);
/* Reads a big endian, two's complement, integer. */
void
nettle_mpz_set_str_256_s(mpz_t x,
unsigned length, const uint8_t *s);
void
nettle_mpz_init_set_str_256_s(mpz_t x,
unsigned length, const uint8_t *s);
/* Similar, but for unsigned format. These function don't interpret
* the most significant bit as the sign. */
void
nettle_mpz_set_str_256_u(mpz_t x,
unsigned length, const uint8_t *s);
void
nettle_mpz_init_set_str_256_u(mpz_t x,
unsigned length, const uint8_t *s);
/* Returns a uniformly distributed random number 0 <= x < 2^n */
void
nettle_mpz_random_size(mpz_t x,
void *ctx, nettle_random_func random,
unsigned bits);
/* Returns a number x, almost uniformly random in the range
* 0 <= x < n. */
void
nettle_mpz_random(mpz_t x,
void *ctx, nettle_random_func random,
const mpz_t n);
struct sexp_iterator;
/* If LIMIT is non-zero, the number must be at most LIMIT bits.
* Implies sexp_iterator_next. */
int
nettle_mpz_set_sexp(mpz_t x, unsigned limit, struct sexp_iterator *i);
#endif /* NETTLE_BIGNUM_H_INCLUDED */
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