NetBSD/sys/dev/rnd_private.h

59 lines
2.3 KiB
C

/* $NetBSD: rnd_private.h,v 1.1 2011/11/29 03:50:31 tls Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Michael Graff <explorer@flame.org>. This code uses ideas and
* algorithms from the Linux driver written by Ted Ts'o.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _DEV_RNDPRIVATE_H
#define _DEV_RNDPRIVATE_H
/*
* Number of bytes returned per hash. This value is used in both
* rnd.c and rndpool.c to decide when enough entropy exists to do a
* hash to extract it.
*/
#define RND_ENTROPY_THRESHOLD 10
/*
* Size of the event queue. This _MUST_ be a power of 2.
*/
#ifndef RND_EVENTQSIZE
#define RND_EVENTQSIZE 128
#endif
/*
* Used by rnd_extract_data() and rndpool_extract_data() to describe how
* "good" the data has to be.
*/
#define RND_EXTRACT_ANY 0 /* extract anything, even if no entropy */
#define RND_EXTRACT_GOOD 1 /* return as many good bytes
(short read ok) */
uint32_t rnd_extract_data(void *, uint32_t, uint32_t);
#endif