Commit 91a6ac38 authored by Niels Möller's avatar Niels Möller

(dsa_keypair_from_sexp_alist, dsa_keypair_from_sexp):

New file, new functions.

Rev: src/nettle/sexp2dsa.c:1.1
parent f3848a07
/* sexp2dsa.c
*
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2002 Niels Mller
*
* 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 WITH_PUBLIC_KEY
#include "dsa.h"
#include "bignum.h"
#include "sexp.h"
#include <string.h>
#define GET(x, l, v) \
do { if (!nettle_mpz_set_sexp((x), (l), (v))) return 0; } while(0)
/* Iterator should point past the algorithm tag, e.g.
*
* (public-key (dsa (p |xxxx|) ...)
* ^ here
*/
int
dsa_keypair_from_sexp_alist(struct dsa_public_key *pub,
struct dsa_private_key *priv,
unsigned limit,
struct sexp_iterator *i)
{
static const uint8_t *names[5]
= { "p", "q", "g", "y", "x" };
struct sexp_iterator values[5];
unsigned nvalues = priv ? 5 : 4;
if (!sexp_iterator_assoc(i, nvalues, names, values))
return 0;
if (priv)
GET(priv->x, limit, &values[4]);
GET(pub->p, limit, &values[0]);
GET(pub->q, DSA_Q_BITS, &values[1]);
GET(pub->g, limit, &values[2]);
GET(pub->y, limit, &values[3]);
return 1;
}
int
dsa_keypair_from_sexp(struct dsa_public_key *pub,
struct dsa_private_key *priv,
unsigned limit,
unsigned length, const uint8_t *expr)
{
struct sexp_iterator i;
return sexp_iterator_first(&i, length, expr)
&& sexp_iterator_check_type(&i, priv ? "private-key" : "public-key")
&& sexp_iterator_check_type(&i, "dsa")
&& dsa_keypair_from_sexp_alist(pub, priv, limit, &i);
}
#endif /* WITH_PUBLIC_KEY */
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment