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/* run-genrandom.c - Test tool for the genrandom function
* Copyright (C) 2025 g10 Code GmbH
*
* This file is part of GPGME.
*
* GPGME 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.
*
* GPGME 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 program; if not, see <https://gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
/* We need to include config.h so that we know whether we are building
with large file system (LFS) support. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <stdint.h>
#include <gpgme.h>
#define PGM "run-genrandom"
#include "run-support.h"
static int verbose;
static int
show_usage (int ex)
{
fputs ("usage: " PGM " [options] [LIMIT]\n\n"
"Options:\n"
" --verbose run in verbose mode\n"
" --zbase32 generate 30 zbase32 characters\n"
" --hex return a hex value in LIMIT mode\n"
"\n"
"With LIMIT return a decimal value in the range [0,LIMIT)\n"
, stderr);
exit (ex);
}
int
main (int argc, char **argv)
{
int last_argc = -1;
gpgme_error_t err;
gpgme_ctx_t ctx;
gpgme_protocol_t protocol = GPGME_PROTOCOL_OPENPGP;
gpgme_random_mode_t mode = 0;
char buffer[128];
int hexmode = 0;
int valuemode = 0;
if (argc)
{ argc--; argv++; }
while (argc && last_argc != argc )
{
last_argc = argc;
if (!strcmp (*argv, "--"))
{
argc--; argv++;
break;
}
else if (!strcmp (*argv, "--help"))
show_usage (0);
else if (!strcmp (*argv, "--verbose"))
{
verbose = 1;
argc--; argv++;
}
else if (!strcmp (*argv, "--zbase32"))
{
mode = GPGME_RANDOM_MODE_ZBASE32;
argc--; argv++;
}
else if (!strcmp (*argv, "--hex"))
{
hexmode = 1;
argc--; argv++;
}
else if (!strncmp (*argv, "--", 2))
show_usage (1);
}
if (argc == 1)
valuemode = 1;
else if (argc)
show_usage (1);
if ((valuemode && mode) || (!valuemode && hexmode))
show_usage (1);
init_gpgme (protocol);
err = gpgme_new (&ctx);
fail_if_err (err);
gpgme_set_protocol (ctx, protocol);
if (valuemode)
{
size_t limit, value;
errno = 0;
limit = strtoul (*argv, NULL, 0);
if (errno)
{
fprintf (stderr, PGM ": error parsing LIMIT arg: %s\n",
strerror (errno));
exit (1);
}
if (limit > SIZE_MAX)
{
fprintf (stderr, PGM ": error parsing LIMIT arg: %s\n",
"too large for size_t");
exit (1);
}
err = gpgme_op_random_value (ctx, limit, &value);
if (err)
{
fprintf (stderr, PGM ": error getting random: %s\n",
gpg_strerror (err));
exit (1);
}
if (hexmode)
printf ("%zx\n", value);
else
printf ("%zu\n", value);
}
else
{
err = gpgme_op_random_bytes (ctx, mode, buffer, sizeof buffer);
if (err)
{
fprintf (stderr, PGM ": error getting random: %s\n",
gpg_strerror (err));
exit (1);
}
if (mode == GPGME_RANDOM_MODE_ZBASE32)
puts (buffer);
else
{
int i;
for (i=0; i < sizeof buffer; i++)
{
if (i && !(i%32))
putchar ('\n');
printf ("%02x", ((unsigned char *)buffer)[i]);
}
putchar ('\n');
}
}
gpgme_release (ctx);
return 0;
}
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