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opcodes.c

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  • knuth-lfib.h 2.02 KiB
    /* knuth-lfib.h
     *
     * A "lagged fibonacci" pseudorandomness generator.
     *
     * Described in Knuth, TAOCP, 3.6
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2002 Niels Mller
     *  
     * 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., 59 Temple Place - Suite 330, Boston,
     * MA 02111-1307, 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"
    
    /* 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,
    		     unsigned n, uint32_t *a);
    
    /* Get an array of octets. */
    void
    knuth_lfib_random(struct knuth_lfib_ctx *ctx,
    		  unsigned n, uint8_t *dst);
    
    #endif /* NETTLE_KNUTH_LFIB_H_INCLUDED */