2069f00ef1
can more easily be used INSTEAD OF the hard-working Yarrow. The only hardware source used at this point is the one inside the VIA C3 Nehemiah (Stepping 3 and above) CPU. More sources will be added in due course. Contributions welcome!
60 lines
2.3 KiB
C
60 lines
2.3 KiB
C
/*-
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* Copyright (c) 2000-2004 Mark R V Murray
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/* This contains Yarrow-specific declarations.
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* See http://www.counterpane.com/yarrow.html
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*/
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#define TIMEBIN 16 /* max value for Pt/t */
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#define FAST 0
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#define SLOW 1
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/* This is the beastie that needs protecting. It contains all of the
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* state that we are excited about.
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* Exactly one will be instantiated.
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*/
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struct random_state {
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u_int64_t counter[4]; /* C - 256 bits */
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struct yarrowkey key; /* K */
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u_int gengateinterval; /* Pg */
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u_int bins; /* Pt/t */
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u_int outputblocks; /* count output blocks for gates */
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u_int slowoverthresh; /* slow pool overthreshhold reseed count */
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struct pool {
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struct source {
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u_int bits; /* estimated bits of entropy */
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u_int frac; /* fractional bits of entropy
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(given as 1024/n) */
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} source[ENTROPYSOURCE];
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u_int thresh; /* pool reseed threshhold */
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struct yarrowhash hash; /* accumulated entropy */
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} pool[2]; /* pool[0] is fast, pool[1] is slow */
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u_int which; /* toggle - sets the current insertion pool */
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};
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