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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 07:24:22 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 07:24:22 +0000 |
commit | 45d6379135504814ab723b57f0eb8be23393a51d (patch) | |
tree | d4f2ec4acca824a8446387a758b0ce4238a4dffa /bin/tests/optional/lfsr_test.c | |
parent | Initial commit. (diff) | |
download | bind9-upstream/1%9.16.44.tar.xz bind9-upstream/1%9.16.44.zip |
Adding upstream version 1:9.16.44.upstream/1%9.16.44upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | bin/tests/optional/lfsr_test.c | 93 |
1 files changed, 93 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..c1c99f0 --- /dev/null +++ b/bin/tests/optional/lfsr_test.c @@ -0,0 +1,93 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * SPDX-License-Identifier: MPL-2.0 + * + * 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 https://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + +/*! \file */ + +#include <inttypes.h> +#include <stdio.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 reproducible. + */ + 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); +} |