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-.\" $OpenBSD: arc4random.3,v 1.37 2019/09/29 16:30:35 jmc Exp $
-.\"
-.\" Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
-.\" 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 Niels Provos.
-.\" 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.
-.\"
-.\" Manual page, using -mandoc macros
-.\"
-.Dd $Mdocdate: September 29 2019 $
-.Dt ARC4RANDOM 3
-.Os
-.Sh NAME
-.Nm arc4random ,
-.Nm arc4random_buf ,
-.Nm arc4random_uniform
-.Nd random number generator
-.Sh SYNOPSIS
-.In stdlib.h
-.Ft uint32_t
-.Fn arc4random "void"
-.Ft void
-.Fn arc4random_buf "void *buf" "size_t nbytes"
-.Ft uint32_t
-.Fn arc4random_uniform "uint32_t upper_bound"
-.Sh DESCRIPTION
-This family of functions provides higher quality data than those
-described in
-.Xr rand 3 ,
-.Xr random 3 ,
-and
-.Xr rand48 3 .
-.Pp
-Use of these functions is encouraged for almost all random number
-consumption because the other interfaces are deficient in either
-quality, portability, standardization, or availability.
-These functions can be called in almost all coding environments,
-including
-.Xr pthreads 3
-and
-.Xr chroot 2 .
-.Pp
-High quality 32-bit pseudo-random numbers are generated very quickly.
-On each call, a cryptographic pseudo-random number generator is used
-to generate a new result.
-One data pool is used for all consumers in a process, so that consumption
-under program flow can act as additional stirring.
-The subsystem is re-seeded from the kernel
-.Xr random 4
-subsystem using
-.Xr getentropy 2
-on a regular basis, and also upon
-.Xr fork 2 .
-.Pp
-The
-.Fn arc4random
-function returns a single 32-bit value.
-.Pp
-.Fn arc4random_buf
-fills the region
-.Fa buf
-of length
-.Fa nbytes
-with random data.
-.Pp
-.Fn arc4random_uniform
-will return a single 32-bit value, uniformly distributed but less than
-.Fa upper_bound .
-This is recommended over constructions like
-.Dq Li arc4random() % upper_bound
-as it avoids "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.
-.Sh RETURN VALUES
-These functions are always successful, and no return value is
-reserved to indicate an error.
-.Sh SEE ALSO
-.Xr rand 3 ,
-.Xr rand48 3 ,
-.Xr random 3
-.Sh HISTORY
-These functions first appeared in
-.Ox 2.1 .
-.Pp
-The original version of this random number generator used the
-RC4 (also known as ARC4) algorithm.
-In
-.Ox 5.5
-it was replaced with the ChaCha20 cipher, and it may be replaced
-again in the future as cryptographic techniques advance.
-A good mnemonic is
-.Dq A Replacement Call for Random .