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+.\"	$OpenBSD: random.4,v 1.36 2020/05/29 03:27:29 deraadt Exp $
+.\"
+.\" Copyright (c) 1996, 1997 Michael Shalayeff
+.\"
+.\" 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 REGENTS 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 REGENTS 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.
+.\"
+.Dd $Mdocdate: May 29 2020 $
+.Dt RANDOM 4
+.Os
+.Sh NAME
+.Nm random ,
+.Nm urandom
+.Nd random data source device
+.Sh DESCRIPTION
+The
+.Nm urandom
+device produces high quality pseudo-random output data without ever
+blocking.
+.Pp
+Entropy data stored previously is provided to the kernel during the
+boot sequence and used as inner-state of a stream cipher.
+High quality data is available immediately upon kernel startup.
+System activity (such as disk, network, and clock device interrupts),
+and hardware random generator output is collected, whitened with a crc
+and hash, then periodically folded together with stream cipher
+inner-state and outer-state to create a new inner state.
+Reads from all consumers (including the kernel itself, which makes many
+requests per second) are sliced from the same output stream, which carves
+the stream cipher output unpredictably and helps improve forward and
+backtracking protection beyond the strength of the stream cipher.
+.Pp
+The
+.Nm urandom
+device is intended to be used in scripts.
+In C programs, use the
+.Xr arc4random 3
+family of functions instead, which can be called in almost all
+coding environments, including
+.Xr pthreads 3 ,
+.Xr chroot 2 ,
+.Xr pledge 2 ,
+and
+.Xr unveil 2 ,
+and which avoids accessing a filesystem device every time.
+.Pp
+For portability reasons, never use
+.Pa /dev/random .
+On
+.Ox ,
+it is an alias for
+.Pa /dev/urandom ,
+but on many other systems misbehaves by blocking because their
+random number generators lack a robust boot-time initialization sequence.
+.Sh FILES
+.Bl -tag -width /dev/urandom -compact
+.It Pa /dev/urandom
+.El
+.Sh SEE ALSO
+.Xr arc4random 3 ,
+.Xr amdpm 4 ,
+.Xr glxsb 4 ,
+.Xr pchb 4 ,
+.Xr arc4random 9
+.Sh HISTORY
+A
+.Nm
+device first appeared in Linux in 1994.
+The
+.Nm random
+and
+.Nm urandom
+devices have been available since
+.Ox 2.0 .