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84d4f509f0
There is no more TAILQ fifo to harvest the entropy; instead, there is a circular buffer of constant size (changeable by macro) that pretty dramatically improves the speed and fixes potential slowdowns- by-locking. Also gone are a slew of malloc(9) and free(9) calls; all harvesting buffers are static. All-in-all, this is a good performance improvement. Thanks-to: msmith for the circular buffer concept-code.
78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
/*-
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* Copyright (c) 2000 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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/* #define ENTROPYSOURCE nn entropy sources (actually classes)
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* This is properly defined in
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* an enum in sys/random.h
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*/
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#define HARVEST_RING_SIZE 1024 /* harvest ring buffer size */
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#define TIMEBIN 16 /* max value for Pt/t */
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#define HARVESTSIZE 16 /* max size of each harvested entropy unit */
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#define FAST 0
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#define SLOW 1
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int random_init(void);
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void random_deinit(void);
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void random_init_harvester(void (*)(u_int64_t, void *, u_int, u_int, u_int, enum esource), u_int (*)(void *, u_int));
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void random_deinit_harvester(void);
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void random_set_wakeup_exit(void *);
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void random_reseed(void);
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u_int read_random_real(void *, u_int);
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void write_random(void *, u_int);
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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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*/
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struct random_state {
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u_int64_t counter; /* C */
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struct yarrowkey key; /* K */
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int gengateinterval; /* Pg */
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int bins; /* Pt/t */
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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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int which; /* toggle - shows the current insertion pool */
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int seeded; /* 0 until first reseed, then 1 */
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struct selinfo rsel; /* For poll(2) */
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};
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extern struct random_state random_state;
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