4d0e6f79d6
with splhigh(). However, the entropy-harvesting routine needs pretty serious irq-protection, as it is called out of irq handlers etc. Clues given by: bde
74 lines
2.5 KiB
C
74 lines
2.5 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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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/linker.h>
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#include <sys/libkern.h>
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#include <sys/mbuf.h>
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#include <sys/random.h>
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#include <sys/time.h>
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#include <crypto/blowfish/blowfish.h>
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#include <dev/randomdev/yarrow.h>
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/* hold the address of the routine which is actually called if */
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/* the ramdomdev is loaded */
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static void (*reap)(struct timespec *, u_int64_t, u_int, u_int, u_int) = NULL;
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/* Initialise the harvester at load time */
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void
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random_init_harvester(void (*reaper)(struct timespec *, u_int64_t, u_int, u_int, u_int))
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{
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reap = reaper;
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}
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/* Deinitialise the harvester at unload time */
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void
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random_deinit_harvester(void)
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{
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reap = NULL;
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}
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/* Entropy harvesting routine. This is supposed to be fast; do */
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/* not do anything slow in here! */
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/* Implemented as in indirect call to allow non-inclusion of */
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/* the entropy device. */
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void
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random_harvest(u_int64_t entropy, u_int bits, u_int frac, u_int source)
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{
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struct timespec nanotime;
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if (reap) {
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getnanotime(&nanotime);
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(*reap)(&nanotime, entropy, bits, frac, source);
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}
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}
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