98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/* $NetBSD: lfsr_test.c,v 1.1.1.4 2007/01/27 21:04:02 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 2004, 2005 Internet Systems Consortium, Inc. ("ISC")
|
|
* Copyright (C) 1999-2001 Internet Software Consortium.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
|
|
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
|
|
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
|
|
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
|
|
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
|
|
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
* PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
/* Id: lfsr_test.c,v 1.12.18.2 2005/04/29 00:15:46 marka Exp */
|
|
|
|
/*! \file */
|
|
#include <config.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <isc/lfsr.h>
|
|
#include <isc/util.h>
|
|
|
|
isc_uint32_t state[1024 * 64];
|
|
|
|
int
|
|
main(int argc, char **argv) {
|
|
isc_lfsr_t lfsr1, lfsr2;
|
|
int i;
|
|
isc_uint32_t temp;
|
|
|
|
UNUSED(argc);
|
|
UNUSED(argv);
|
|
|
|
/*
|
|
* Verify that returned values are reproducable.
|
|
*/
|
|
isc_lfsr_init(&lfsr1, 0, 32, 0x80000057U, 0, NULL, NULL);
|
|
for (i = 0; i < 32; i++) {
|
|
isc_lfsr_generate(&lfsr1, &state[i], 4);
|
|
printf("lfsr1: state[%2d] = %08x\n", i, state[i]);
|
|
}
|
|
isc_lfsr_init(&lfsr1, 0, 32, 0x80000057U, 0, NULL, NULL);
|
|
for (i = 0; i < 32; i++) {
|
|
isc_lfsr_generate(&lfsr1, &temp, 4);
|
|
if (state[i] != temp)
|
|
printf("lfsr1: state[%2d] = %08x, "
|
|
"but new state is %08x\n",
|
|
i, state[i], temp);
|
|
}
|
|
|
|
/*
|
|
* Now do the same with skipping.
|
|
*/
|
|
isc_lfsr_init(&lfsr1, 0, 32, 0x80000057U, 0, NULL, NULL);
|
|
for (i = 0; i < 32; i++) {
|
|
isc_lfsr_generate(&lfsr1, &state[i], 4);
|
|
isc_lfsr_skip(&lfsr1, 32);
|
|
printf("lfsr1: state[%2d] = %08x\n", i, state[i]);
|
|
}
|
|
isc_lfsr_init(&lfsr1, 0, 32, 0x80000057U, 0, NULL, NULL);
|
|
for (i = 0; i < 32; i++) {
|
|
isc_lfsr_generate(&lfsr1, &temp, 4);
|
|
isc_lfsr_skip(&lfsr1, 32);
|
|
if (state[i] != temp)
|
|
printf("lfsr1: state[%2d] = %08x, "
|
|
"but new state is %08x\n",
|
|
i, state[i], temp);
|
|
}
|
|
|
|
/*
|
|
* Try to find the period of the LFSR.
|
|
*
|
|
* x^16 + x^5 + x^3 + x^2 + 1
|
|
*/
|
|
isc_lfsr_init(&lfsr2, 0, 16, 0x00008016U, 0, NULL, NULL);
|
|
for (i = 0; i < 32; i++) {
|
|
isc_lfsr_generate(&lfsr2, &state[i], 4);
|
|
printf("lfsr2: state[%2d] = %08x\n", i, state[i]);
|
|
}
|
|
isc_lfsr_init(&lfsr2, 0, 16, 0x00008016U, 0, NULL, NULL);
|
|
for (i = 0; i < 32; i++) {
|
|
isc_lfsr_generate(&lfsr2, &temp, 4);
|
|
if (state[i] != temp)
|
|
printf("lfsr2: state[%2d] = %08x, "
|
|
"but new state is %08x\n",
|
|
i, state[i], temp);
|
|
}
|
|
|
|
return (0);
|
|
}
|