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-.\"	$OpenBSD: arc4random.9,v 1.2 2003/04/17 13:41:30 mickey Exp $
-.\"
-.\" Copyright (c) 1996,2000 Michael Shalayeff
-.\" All rights reserved.
-.\"
-.\" 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.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"      This product includes software developed by Michael Shalayeff
-.\" 3. The name of the author may not be used to endorse or promote products
-.\"    derived from this software without specific prior written permission
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
-.\"
-.Dd March 26, 1996
-.Dt RANDOM 9
-.Os
-.Sh NAME
-.Nm random
-.Nd device kernel interface
-.Sh SYNOPSIS
-.Fd #include <dev/rndvar.h>
-.Ft void
-.Fn add_true_randomness "int"
-.Ft void
-.Fn add_timer_randomness "int"
-.Ft void
-.Fn add_mouse_randomness "int"
-.Ft void
-.Fn add_tty_randomness "int"
-.Ft void
-.Fn add_net_randomness "int"
-.Ft void
-.Fn add_disk_randomness "int"
-.Ft void
-.Fn add_audio_randomness "int"
-.Ft void
-.Fn get_random_bytes "void *buf" "size_t nbytes"
-.Ft u_int32_t
-.Fn arc4random "void"
-.br
-.Sh DESCRIPTION
-.Nm add_mouse_randomness ,
-.Nm add_tty_randomness ,
-.Nm add_net_randomness ,
-.Nm add_disk_randomness ,
-.Nm add_audio_randomness
-routines are used to
-supply data for the random data source device for further processing.
-The processing involves calculating inter-event time delta and measuring
-entropy contained in the resulting delta-T, supplied in argument data
-is just mixed into the pool and does not increase entropy counter.
-.br
-.Nm add_true_randomness
-does not involve usual timing calculations
-and causes supplied data argument added to the entropy pool
-increasing the entropy counter by 32 bits.
-.br
-.Nm add_timer_randomness
-will not cause entropy counter to rise, it
-is used to change the state of the pool periodically mostly
-by meaning of timing random driver's operations.
-.Pp
-.Nm get_random_bytes
-may be used to retrieve strong random data, just
-as it would by
-.Xr srandom 4
-device.
-.br
-.Nm arc4random
-will give random 32 bit numbers hashed with
-the ARC4 algorithm, which appears to be faster and less abusive
-to the entropy pool.
-.Sh SEE ALSO
-.Xr arc4random 3 ,
-.Xr pchb 4 ,
-.Xr random 4