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/* sexp2rsa.h
*
*/
/* 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., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#if HAVE_LIBGMP
#include "rsa.h"
#include "bignum.h"
#include "sexp.h"
#include <string.h>
static int
get_value(mpz_t x, struct sexp_iterator *i)
{
if (sexp_iterator_next(i)
&& i->type == SEXP_ATOM
&& !i->display)
{
nettle_mpz_set_str_256(x, i->atom_length, i->atom);
return 1;
}
else
return 0;
}
#define GET(x, v) do { if (!get_value(x, v)) return 0; } while(0)
int
rsa_keypair_from_sexp(struct rsa_public_key *pub,
struct rsa_private_key *priv,
unsigned length, const uint8_t *expr)
{
struct sexp_iterator i;
static const uint8_t *inner[8]
= { "n", "e", "d", "p", "q", "a", "b", "c" };
static const uint8_t *names[3]
= { "rsa", "rsa-pkcs1", "rsa-pkcs1-sha1" };
const uint8_t *outer;
struct sexp_iterator values[8];
unsigned nvalues;
sexp_iterator_init(&i, length, expr);
if (!sexp_iterator_next(&i))
return 0;
if (priv)
{
outer = "private-key";
nvalues = 8;
}
else
{
outer = "public-key";
nvalues = 2;
}
if (!sexp_iterator_check_type(&i, outer))
return 0;
if (!sexp_iterator_next(&i))
return 0;
if (!sexp_iterator_check_types(&i, 3, names))
return 0;
if (!sexp_iterator_assoc(&i, nvalues, inner, values))
return 0;
if (priv)
{
GET(priv->d, &values[2]);
GET(priv->p, &values[3]);
GET(priv->q, &values[4]);
GET(priv->a, &values[5]);
GET(priv->b, &values[6]);
GET(priv->c, &values[7]);
}
if (pub)
{
GET(pub->n, &values[0]);
GET(pub->e, &values[1]);
}
return 1;
}
#endif /* HAVE_LIBGMP */
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