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/*
* Copyright (C) 2004,2005,2007,2008 Free Software Foundation
* Copyright (C) 2001,2002,2003 Nikos Mavrogiannopoulos
*
* This file is part of GNUTLS.
*
* GNUTLS is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNUTLS 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#ifdef ENABLE_PKI
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <gnutls/gnutls.h>
/* Generates Diffie Hellman parameters (a prime and a generator
* of the group). Exports them in PKCS #3 format. Used by certtool.
*/
extern FILE *outfile;
extern FILE *infile;
extern unsigned char buffer[];
extern const int buffer_size;
static int cparams = 0;
/* If how is zero then the included parameters are used.
*/
int
generate_prime (int bits, int how)
{
unsigned int i;
int ret;
gnutls_dh_params_t dh_params;
gnutls_datum_t p, g;
gnutls_dh_params_init (&dh_params);
fprintf (stderr, "Generating DH parameters...");
if (how != 0)
{
ret = gnutls_dh_params_generate2 (dh_params, bits);
if (ret < 0)
{
fprintf (stderr, "Error generating parameters: %s\n",
gnutls_strerror (ret));
exit (1);
}
ret = gnutls_dh_params_export_raw (dh_params, &p, &g, NULL);
if (ret < 0)
{
fprintf (stderr, "Error exporting parameters: %s\n",
gnutls_strerror (ret));
exit (1);
}
}
else
{
#ifdef ENABLE_SRP
if (bits <= 1024)
{
p = gnutls_srp_1024_group_prime;
g = gnutls_srp_1024_group_generator;
}
else if (bits <= 1536)
{
p = gnutls_srp_1536_group_prime;
g = gnutls_srp_1536_group_generator;
}
else
{
p = gnutls_srp_2048_group_prime;
g = gnutls_srp_2048_group_generator;
}
ret = gnutls_dh_params_import_raw (dh_params, &p, &g);
if (ret < 0)
{
fprintf (stderr, "Error exporting parameters: %s\n",
gnutls_strerror (ret));
exit (1);
}
#else
fprintf (stderr, "Parameters unavailable as SRP disabled.\n");
#endif
}
if (cparams)
{
fprintf (outfile, "/* generator */\n");
fprintf (outfile, "\nconst uint8 g[%d] = { ", g.size);
for (i = 0; i < g.size; i++)
{
if (i % 7 == 0)
fprintf (outfile, "\n\t");
fprintf (outfile, "0x%.2x", g.data[i]);
if (i != g.size - 1)
fprintf (outfile, ", ");
}
fprintf (outfile, "\n};\n\n");
}
else
{
fprintf (outfile, "\nGenerator: ");
for (i = 0; i < g.size; i++)
{
if (i != 0 && i % 12 == 0)
fprintf (outfile, "\n\t");
else if (i != 0 && i != g.size)
fprintf (outfile, ":");
fprintf (outfile, "%.2x", g.data[i]);
}
fprintf (outfile, "\n\n");
}
/* print prime */
if (cparams)
{
fprintf (outfile, "/* prime - %d bits */\n", p.size * 8);
fprintf (outfile, "\nconst uint8 prime[%d] = { ", p.size);
for (i = 0; i < p.size; i++)
{
if (i % 7 == 0)
fprintf (outfile, "\n\t");
fprintf (outfile, "0x%.2x", p.data[i]);
if (i != p.size - 1)
fprintf (outfile, ", ");
}
fprintf (outfile, "\n};\n");
}
else
{
fprintf (outfile, "Prime: ");
for (i = 0; i < p.size; i++)
{
if (i != 0 && i % 12 == 0)
fprintf (outfile, "\n\t");
else if (i != 0 && i != p.size)
fprintf (outfile, ":");
fprintf (outfile, "%.2x", p.data[i]);
}
fprintf (outfile, "\n\n");
}
if (!cparams)
{ /* generate a PKCS#3 structure */
size_t len = buffer_size;
ret = gnutls_dh_params_export_pkcs3 (dh_params, GNUTLS_X509_FMT_PEM,
buffer, &len);
if (ret == 0)
{
fprintf (outfile, "\n%s", buffer);
}
else
{
fprintf (stderr, "Error: %s\n", gnutls_strerror (ret));
}
}
return 0;
}
#endif
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