his is wrong

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+.\"	$OpenBSD: random.9,v 1.14 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
+.\" 4. 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 RND 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