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/*
* Copyright (C) 2001,2002,2003 Nikos Mavroyanopoulos
* Copyright (C) 2004 Free Software Foundation
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#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;
int generate_prime(int bits)
{
unsigned int i;
int ret;
gnutls_dh_params dh_params;
gnutls_datum p, g;
gnutls_dh_params_init( &dh_params);
fprintf(stderr, "Generating DH parameters...");
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);
}
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 */
int ret;
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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