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/*
* Copyright (C) 2003, 2004, 2005 Free Software Foundation
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GNUTLS.
*
* The GNUTLS 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.
*
* This 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
/* This file contains code for DSA keys.
*/
#include <gnutls_int.h>
#include <gnutls_errors.h>
#include <gnutls_datum.h>
#include <debug.h>
/* resarr will contain: p(0), q(1), g(2), y(3), x(4).
*/
int
_gnutls_dsa_generate_params (mpi_t * resarr, int *resarr_len, int bits)
{
int ret;
gcry_sexp_t parms, key, list;
/* FIXME: Remove me once we depend on 1.3.1 */
if (bits > 1024 && gcry_check_version ("1.3.1") == NULL)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
if (bits < 512)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
ret = gcry_sexp_build (&parms, NULL, "(genkey(dsa(nbits %d)))", bits);
if (ret != 0)
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
/* generate the DSA key
*/
ret = gcry_pk_genkey (&key, parms);
gcry_sexp_release (parms);
if (ret != 0)
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
list = gcry_sexp_find_token (key, "p", 0);
if (list == NULL)
{
gnutls_assert ();
gcry_sexp_release (key);
return GNUTLS_E_INTERNAL_ERROR;
}
resarr[0] = gcry_sexp_nth_mpi (list, 1, 0);
gcry_sexp_release (list);
list = gcry_sexp_find_token (key, "q", 0);
if (list == NULL)
{
gnutls_assert ();
gcry_sexp_release (key);
return GNUTLS_E_INTERNAL_ERROR;
}
resarr[1] = gcry_sexp_nth_mpi (list, 1, 0);
gcry_sexp_release (list);
list = gcry_sexp_find_token (key, "g", 0);
if (list == NULL)
{
gnutls_assert ();
gcry_sexp_release (key);
return GNUTLS_E_INTERNAL_ERROR;
}
resarr[2] = gcry_sexp_nth_mpi (list, 1, 0);
gcry_sexp_release (list);
list = gcry_sexp_find_token (key, "y", 0);
if (list == NULL)
{
gnutls_assert ();
gcry_sexp_release (key);
return GNUTLS_E_INTERNAL_ERROR;
}
resarr[3] = gcry_sexp_nth_mpi (list, 1, 0);
gcry_sexp_release (list);
list = gcry_sexp_find_token (key, "x", 0);
if (list == NULL)
{
gnutls_assert ();
gcry_sexp_release (key);
return GNUTLS_E_INTERNAL_ERROR;
}
resarr[4] = gcry_sexp_nth_mpi (list, 1, 0);
gcry_sexp_release (list);
gcry_sexp_release (key);
_gnutls_dump_mpi ("p: ", resarr[0]);
_gnutls_dump_mpi ("q: ", resarr[1]);
_gnutls_dump_mpi ("g: ", resarr[2]);
_gnutls_dump_mpi ("y: ", resarr[3]);
_gnutls_dump_mpi ("x: ", resarr[4]);
*resarr_len = 5;
return 0;
}
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