The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/random/yarrow.h

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    1 /*-
    2  * Copyright (c) 2000-2004 Mark R V Murray
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/9.0/sys/dev/random/yarrow.h 128059 2004-04-09 15:47:10Z markm $
   27  */
   28 
   29 /* This contains Yarrow-specific declarations.
   30  * See http://www.counterpane.com/yarrow.html
   31  */
   32 
   33 #define TIMEBIN         16      /* max value for Pt/t */
   34 
   35 #define FAST            0
   36 #define SLOW            1
   37 
   38 /* This is the beastie that needs protecting. It contains all of the
   39  * state that we are excited about.
   40  * Exactly one will be instantiated.
   41  */
   42 struct random_state {
   43         u_int64_t counter[4];   /* C - 256 bits */
   44         struct yarrowkey key;   /* K */
   45         u_int gengateinterval;  /* Pg */
   46         u_int bins;             /* Pt/t */
   47         u_int outputblocks;     /* count output blocks for gates */
   48         u_int slowoverthresh;   /* slow pool overthreshhold reseed count */
   49         struct pool {
   50                 struct source {
   51                         u_int bits;     /* estimated bits of entropy */
   52                         u_int frac;     /* fractional bits of entropy
   53                                            (given as 1024/n) */
   54                 } source[ENTROPYSOURCE];
   55                 u_int thresh;   /* pool reseed threshhold */
   56                 struct yarrowhash hash; /* accumulated entropy */
   57         } pool[2];              /* pool[0] is fast, pool[1] is slow */
   58         u_int which;            /* toggle - sets the current insertion pool */
   59 };

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