81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/* knuth-lfib.h
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The "lagged fibonacci" pseudorandomness generator, described in
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Knuth, TAoCP, 3.6
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This file is part of GNU Nettle.
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GNU Nettle is free software: you can redistribute it and/or
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modify it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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or both in parallel, as here.
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GNU Nettle is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see http://www.gnu.org/licenses/.
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*/
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/* NOTE: This generator is totally inappropriate for cryptographic
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* applications. It is useful for generating deterministic but
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* random-looking test data, and is used by the Nettle testsuite. */
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#ifndef NETTLE_KNUTH_LFIB_H_INCLUDED
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#define NETTLE_KNUTH_LFIB_H_INCLUDED
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#include "nettle-types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Namespace mangling */
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#define knuth_lfib_init nettle_knuth_lfib_init
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#define knuth_lfib_get nettle_knuth_lfib_get
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#define knuth_lfib_get_array nettle_knuth_lfib_get_array
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#define knuth_lfib_random nettle_knuth_lfib_random
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#define _KNUTH_LFIB_KK 100
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struct knuth_lfib_ctx
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{
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uint32_t x[_KNUTH_LFIB_KK];
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unsigned index;
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};
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void
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knuth_lfib_init(struct knuth_lfib_ctx *ctx, uint32_t seed);
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/* Get's a single number in the range 0 ... 2^30-1 */
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uint32_t
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knuth_lfib_get(struct knuth_lfib_ctx *ctx);
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/* Get an array of numbers */
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void
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knuth_lfib_get_array(struct knuth_lfib_ctx *ctx,
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size_t n, uint32_t *a);
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/* Get an array of octets. */
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void
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knuth_lfib_random(struct knuth_lfib_ctx *ctx,
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size_t n, uint8_t *dst);
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#ifdef __cplusplus
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}
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#endif
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#endif /* NETTLE_KNUTH_LFIB_H_INCLUDED */
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