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41 results

yarrow256.c

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  • yarrow256.c 8.94 KiB
    /* yarrow256.c
    
       The yarrow pseudo-randomness generator.
    
       Copyright (C) 2001, 2008, 2013 Niels Möller
    
       This file is part of GNU Nettle.
    
       GNU Nettle is free software: you can redistribute it and/or
       modify it under the terms of either:
    
         * the GNU Lesser General Public License as published by the Free
           Software Foundation; either version 3 of the License, or (at your
           option) any later version.
    
       or
    
         * the GNU General Public License as published by the Free
           Software Foundation; either version 2 of the License, or (at your
           option) any later version.
    
       or both in parallel, as here.
    
       GNU Nettle 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
       General Public License for more details.
    
       You should have received copies of the GNU General Public License and
       the GNU Lesser General Public License along with this program.  If
       not, see http://www.gnu.org/licenses/.
    */
    
    #if HAVE_CONFIG_H
    # include "config.h"
    #endif
    
    #include <assert.h>
    #include <stdlib.h>
    #include <string.h>
    
    #include "yarrow.h"
    
    #include "macros.h"
    
    #ifndef YARROW_DEBUG
    #define YARROW_DEBUG 0
    #endif
    
    #if YARROW_DEBUG
    #include <stdio.h>
    #endif
    
    /* Parameters */
    
    /* An upper limit on the entropy (in bits) in one octet of sample
     * data. */
    #define YARROW_MULTIPLIER 4
    
    /* Entropy threshold for reseeding from the fast pool */
    #define YARROW_FAST_THRESHOLD 100
    
    /* Entropy threshold for reseeding from the fast pool */
    #define YARROW_SLOW_THRESHOLD 160
    
    /* Number of sources that must exceed the threshold for slow reseed */
    #define YARROW_SLOW_K 2
    
    /* The number of iterations when reseeding, P_t in the yarrow paper.
     * Should be chosen so that reseeding takes on the order of 0.1-1