3 * A "lagged fibonacci" pseudorandomness generator.
5 * Described in Knuth, TAOCP, 3.6
8 /* nettle, low-level cryptographics library
10 * Copyright (C) 2002 Niels Möller
12 * The nettle library is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Lesser General Public License as published by
14 * the Free Software Foundation; either version 2.1 of the License, or (at your
15 * option) any later version.
17 * The nettle library is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
19 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
20 * License for more details.
22 * You should have received a copy of the GNU Lesser General Public License
23 * along with the nettle library; see the file COPYING.LIB. If not, write to
24 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
28 /* NOTE: This generator is totally inappropriate for cryptographic
29 * applications. It is useful for generating deterministic but
30 * random-looking test data, and is used by the Nettle testsuite. */
31 #ifndef NETTLE_KNUTH_LFIB_H_INCLUDED
32 #define NETTLE_KNUTH_LFIB_H_INCLUDED
34 #include "nettle-types.h"
40 /* Namespace mangling */
41 #define knuth_lfib_init nettle_knuth_lfib_init
42 #define knuth_lfib_get nettle_knuth_lfib_get
43 #define knuth_lfib_get_array nettle_knuth_lfib_get_array
44 #define knuth_lfib_random nettle_knuth_lfib_random
46 #define _KNUTH_LFIB_KK 100
50 uint32_t x[_KNUTH_LFIB_KK];
55 knuth_lfib_init(struct knuth_lfib_ctx *ctx, uint32_t seed);
57 /* Get's a single number in the range 0 ... 2^30-1 */
59 knuth_lfib_get(struct knuth_lfib_ctx *ctx);
61 /* Get an array of numbers */
63 knuth_lfib_get_array(struct knuth_lfib_ctx *ctx,
64 unsigned n, uint32_t *a);
66 /* Get an array of octets. */
68 knuth_lfib_random(struct knuth_lfib_ctx *ctx,
69 unsigned n, uint8_t *dst);
75 #endif /* NETTLE_KNUTH_LFIB_H_INCLUDED */