mirror of
https://gitlab.isc.org/isc-projects/bind9
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95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/*
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* Copyright (C) 1999, 2000 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
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* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: lfsr_test.c,v 1.8 2000/07/27 09:38:04 tale Exp $ */
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#include <config.h>
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#include <stdio.h>
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#include <isc/lfsr.h>
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#include <isc/util.h>
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isc_uint32_t state[1024 * 64];
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int
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main(int argc, char **argv) {
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isc_lfsr_t lfsr1, lfsr2;
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int i;
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isc_uint32_t temp;
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UNUSED(argc);
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UNUSED(argv);
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/*
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* Verify that returned values are reproducable.
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*/
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isc_lfsr_init(&lfsr1, 0, 32, 0x80000057U, 0, NULL, NULL);
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for (i = 0 ; i < 32 ; i++) {
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isc_lfsr_generate(&lfsr1, &state[i], 4);
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printf("lfsr1: state[%2d] = %08x\n", i, state[i]);
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}
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isc_lfsr_init(&lfsr1, 0, 32, 0x80000057U, 0, NULL, NULL);
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for (i = 0 ; i < 32 ; i++) {
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isc_lfsr_generate(&lfsr1, &temp, 4);
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if (state[i] != temp)
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printf("lfsr1: state[%2d] = %08x, "
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"but new state is %08x\n",
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i, state[i], temp);
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}
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/*
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* Now do the same with skipping.
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*/
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isc_lfsr_init(&lfsr1, 0, 32, 0x80000057U, 0, NULL, NULL);
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for (i = 0 ; i < 32 ; i++) {
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isc_lfsr_generate(&lfsr1, &state[i], 4);
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isc_lfsr_skip(&lfsr1, 32);
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printf("lfsr1: state[%2d] = %08x\n", i, state[i]);
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}
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isc_lfsr_init(&lfsr1, 0, 32, 0x80000057U, 0, NULL, NULL);
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for (i = 0 ; i < 32 ; i++) {
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isc_lfsr_generate(&lfsr1, &temp, 4);
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isc_lfsr_skip(&lfsr1, 32);
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if (state[i] != temp)
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printf("lfsr1: state[%2d] = %08x, "
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"but new state is %08x\n",
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i, state[i], temp);
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}
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/*
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* Try to find the period of the LFSR.
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*
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* x^16 + x^5 + x^3 + x^2 + 1
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*/
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isc_lfsr_init(&lfsr2, 0, 16, 0x00008016U, 0, NULL, NULL);
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for (i = 0 ; i < 32 ; i++) {
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isc_lfsr_generate(&lfsr2, &state[i], 4);
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printf("lfsr2: state[%2d] = %08x\n", i, state[i]);
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}
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isc_lfsr_init(&lfsr2, 0, 16, 0x00008016U, 0, NULL, NULL);
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for (i = 0 ; i < 32 ; i++) {
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isc_lfsr_generate(&lfsr2, &temp, 4);
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if (state[i] != temp)
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printf("lfsr2: state[%2d] = %08x, "
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"but new state is %08x\n",
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i, state[i], temp);
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}
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return (0);
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}
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