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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 18:37:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 18:37:14 +0000 |
commit | ea648e70a989cca190cd7403fe892fd2dcc290b4 (patch) | |
tree | e2b6b1c647da68b0d4d66082835e256eb30970e8 /bin/tests/optional/lfsr_test.c | |
parent | Initial commit. (diff) | |
download | bind9-ea648e70a989cca190cd7403fe892fd2dcc290b4.tar.xz bind9-ea648e70a989cca190cd7403fe892fd2dcc290b4.zip |
Adding upstream version 1:9.11.5.P4+dfsg.upstream/1%9.11.5.P4+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'bin/tests/optional/lfsr_test.c')
-rw-r--r-- | bin/tests/optional/lfsr_test.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/bin/tests/optional/lfsr_test.c b/bin/tests/optional/lfsr_test.c new file mode 100644 index 0000000..28303e0 --- /dev/null +++ b/bin/tests/optional/lfsr_test.c @@ -0,0 +1,89 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + +/*! \file */ +#include <config.h> + +#include <stdio.h> +#include <inttypes.h> + +#include <isc/lfsr.h> +#include <isc/print.h> +#include <isc/util.h> + +uint32_t state[1024 * 64]; + +int +main(int argc, char **argv) { + isc_lfsr_t lfsr1, lfsr2; + int i; + 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); +} |