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+.\"	$OpenBSD: arc4random.9,v 1.15 2020/05/29 03:19:43 deraadt 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.
+.\"
+.\" 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 $Mdocdate: May 29 2020 $
+.Dt ARC4RANDOM 9
+.Os
+.Sh NAME
+.Nm arc4random ,
+.Nm arc4random_buf ,
+.Nm arc4random_uniform ,
+.Nm enqueue_randomness
+.Nd kernel random subsystem
+.Sh SYNOPSIS
+.In sys/systm.h
+.Ft u_int32_t
+.Fn arc4random "void"
+.Ft void
+.Fn arc4random_buf "void *buf" "size_t nbytes"
+.Ft u_int32_t
+.Fn arc4random_uniform "u_int32_t upper_bound"
+.Ft void
+.Fn enqueue_randomness "int"
+.Sh DESCRIPTION
+.Fn arc4random
+and
+.Fn arc4random_buf
+provide random numbers and are intended to be called in any
+circumstance where random numbers are required.
+.Pp
+.Fn arc4random_uniform
+will return a uniformly distributed random number less than
+.Fa upper_bound ,
+avoiding "modulo bias" when the upper bound is not a power of two.
+In the worst case, this function may consume multiple iterations
+to ensure uniformity; see the source code to understand the problem
+and solution.
+.Pp
+.Fn enqueue_randomness
+causes the supplied data argument to be added to the entropy pool.
+.Sh SEE ALSO
+.Xr arc4random 3 ,
+.Xr random 4