b79ad7e642
exactly the same functionality via a sysctl, making this feature a run-time option. The default is 1(ON), which means that /dev/random device will NOT block at startup. setting kern.random.sys.seeded to 0(OFF) will cause /dev/random to block until the next reseed, at which stage the sysctl will be changed back to 1(ON). While I'm here, clean up the sysctls, and make them dynamic. Reviewed by: des Tested on Alpha by: obrien
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 causes blocking 1 allows normal output */
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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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