Commit 33abdedc authored by Niels Möller's avatar Niels Möller

* tools/nettle-lfib-stream.c: New tool, which outputs a sequence

of pseudorandom (non-cryptographic) bytes, using Knuth's lagged
fibonacci generator.

Rev: src/nettle/tools/.cvsignore:1.3
Rev: src/nettle/tools/Makefile.am:1.6
Rev: src/nettle/tools/nettle-lfib-stream.c:1.1
parent 66fc4f00
.deps
Makefile
Makefile.in
nettle-lfib-stream
sexp-conv
/.deps
/Makefile
/Makefile.in
/nettle-lfib-stream
/sexp-conv
......@@ -5,7 +5,7 @@ AM_CFLAGS = -I$(top_srcdir)
# installed version.
AM_LDFLAGS = -L..
bin_PROGRAMS = sexp-conv
bin_PROGRAMS = sexp-conv nettle-lfib-stream
# libnettle.a is added at the end to make sure all programs depend on it.
# It seems there's no DEPENDENCIES variable that affects all programs.
......
/* lfib-stream.c
*
* Generates a pseudorandom stream, using the Knuth lfib
* (non-cryptographic) pseudorandom generator.
*
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2003 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.
*/
#include "knuth-lfib.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#define BUFSIZE 500
static void
usage(void)
{
fprintf(stderr, "Usage: lfib-stream [SEED]\n");
}
int
main(int argc, char **argv)
{
struct knuth_lfib_ctx ctx;
uint32_t seed;
if (argc == 1)
seed = time(NULL);
else if (argc == 2)
{
seed = atoi(argv[1]);
if (!seed)
{
usage();
return EXIT_FAILURE;
}
}
else
{
usage();
return EXIT_FAILURE;
}
knuth_lfib_init(&ctx, seed);
for (;;)
{
char buffer[BUFSIZE];
knuth_lfib_random(&ctx, BUFSIZE, buffer);
if (fwrite(buffer, 1, BUFSIZE, stdout) < BUFSIZE
|| fflush(stdout) < 0)
return EXIT_FAILURE;
}
/* Not reached. This program is usually terminated by SIGPIPE */
}
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