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/* knuth-lfib.h
*
* A "lagged fibonacci" pseudorandomness generator.
*
* Described in Knuth, TAOCP, 3.6
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2002 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
/* NOTE: This generator is totally inappropriate for cryptographic
* applications. It is useful for generating deterministic but
* random-looking test data, and is used by the Nettle testsuite. */
#ifndef NETTLE_KNUTH_LFIB_H_INCLUDED
#define NETTLE_KNUTH_LFIB_H_INCLUDED
#include "nettle-types.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Namespace mangling */
#define knuth_lfib_init nettle_knuth_lfib_init
#define knuth_lfib_get nettle_knuth_lfib_get
#define knuth_lfib_get_array nettle_knuth_lfib_get_array
#define knuth_lfib_random nettle_knuth_lfib_random
#define _KNUTH_LFIB_KK 100
struct knuth_lfib_ctx
{
uint32_t x[_KNUTH_LFIB_KK];
unsigned index;
};
void
knuth_lfib_init(struct knuth_lfib_ctx *ctx, uint32_t seed);
/* Get's a single number in the range 0 ... 2^30-1 */
uint32_t
knuth_lfib_get(struct knuth_lfib_ctx *ctx);
/* Get an array of numbers */
void
knuth_lfib_get_array(struct knuth_lfib_ctx *ctx,
size_t n, uint32_t *a);
/* Get an array of octets. */
void
knuth_lfib_random(struct knuth_lfib_ctx *ctx,
size_t n, uint8_t *dst);
#ifdef __cplusplus
}
#endif
#endif /* NETTLE_KNUTH_LFIB_H_INCLUDED */
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