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/* sexp2rsa.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 <string.h>
#include "rsa.h"
#include "bignum.h"
#include "sexp.h"
#define GET(x, l, v) \
do { \
if (!nettle_mpz_set_sexp((x), (l), (v)) \
|| mpz_sgn(x) <= 0) \
return 0; \
} while(0)
/* Iterator should point past the algorithm tag, e.g.
*
* (public-key (rsa (n |xxxx|) (e |xxxx|))
* ^ here
*/
int
rsa_keypair_from_sexp_alist(struct rsa_public_key *pub,
struct rsa_private_key *priv,
unsigned limit,
struct sexp_iterator *i)
{
static const uint8_t * const names[8]
= { "n", "e", "d", "p", "q", "a", "b", "c" };
struct sexp_iterator values[8];
unsigned nvalues = priv ? 8 : 2;
if (!sexp_iterator_assoc(i, nvalues, names, values))
return 0;
if (priv)
{
GET(priv->d, limit, &values[2]);
GET(priv->p, limit, &values[3]);
GET(priv->q, limit, &values[4]);
GET(priv->a, limit, &values[5]);
GET(priv->b, limit, &values[6]);
GET(priv->c, limit, &values[7]);
if (!rsa_private_key_prepare(priv))
return 0;
}
if (pub)
{
GET(pub->n, limit, &values[0]);
GET(pub->e, limit, &values[1]);
if (!rsa_public_key_prepare(pub))
return 0;
}
return 1;
}
int
rsa_keypair_from_sexp(struct rsa_public_key *pub,
struct rsa_private_key *priv,
unsigned limit,
size_t length, const uint8_t *expr)
{
struct sexp_iterator i;
static const uint8_t * const names[3]
= { "rsa", "rsa-pkcs1", "rsa-pkcs1-sha1" };
if (!sexp_iterator_first(&i, length, expr))
return 0;
if (!sexp_iterator_check_type(&i, priv ? "private-key" : "public-key"))
return 0;
if (!sexp_iterator_check_types(&i, 3, names))
return 0;
return rsa_keypair_from_sexp_alist(pub, priv, limit, &i);
}
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