1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
|
/* sexp2bignum.c
*
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2002 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "sexp.h"
#include "bignum.h"
int
nettle_mpz_set_sexp(mpz_t x, unsigned limit, struct sexp_iterator *i)
{
if (i->type == SEXP_ATOM
&& i->atom_length
&& !i->display)
{
/* Allow some extra here, for leading sign octets. */
if (limit && (8 * i->atom_length > (16 + limit)))
return 0;
nettle_mpz_set_str_256_s(x, i->atom_length, i->atom);
/* FIXME: How to interpret a limit for negative numbers? */
if (limit && mpz_sizeinbase(x, 2) > limit)
return 0;
return sexp_iterator_next(i);
}
else
return 0;
}
|