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-.\" $OpenBSD: arc4random.3,v 1.2 1997/04/27 22:40:25 angelos 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
-.\" $FreeBSD$
-.\"
-.Dd April 15, 1997
-.Dt ARC4RANDOM 3
-.Os
-.Sh NAME
-.Nm arc4random ,
-.Nm arc4random_buf ,
-.Nm arc4random_uniform ,
-.Nm arc4random_stir ,
-.Nm arc4random_addrandom
-.Nd arc4 random number generator
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In stdlib.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 arc4random_stir "void"
-.Ft void
-.Fn arc4random_addrandom "unsigned char *dat" "int datlen"
-.Sh DESCRIPTION
-The
-.Fn arc4random
-function uses the key stream generator employed by the
-arc4 cipher, which uses 8*8 8 bit S-Boxes.
-The S-Boxes
-can be in about
-.if t 2\u\s71700\s10\d
-.if n (2**1700)
-states.
-The
-.Fn arc4random
-function returns pseudo-random numbers in the range of 0 to
-.if t 2\u\s731\s10\d\(mi1,
-.if n (2**32)\(mi1,
-and therefore has twice the range of
-.Xr rand 3
-and
-.Xr random 3 .
-.Pp
-.Fn arc4random_buf
-function fills the region
-.Fa buf
-of length
-.Fa nbytes
-with ARC4-derived random data.
-.Pp
-.Fn arc4random_uniform
-will return a uniformly distributed random number less than
-.Fa upper_bound .
-.Fn arc4random_uniform
-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.
-.Pp
-The
-.Fn arc4random_stir
-function reads data from
-.Pa /dev/urandom
-and uses it to permute the S-Boxes via
-.Fn arc4random_addrandom .
-.Pp
-There is no need to call
-.Fn arc4random_stir
-before using
-.Fn arc4random
-functions family, since
-they automatically initialize themselves.
-.Sh EXAMPLES
-The following produces a drop-in replacement for the traditional
-.Fn rand
-and
-.Fn random
-functions using
-.Fn arc4random :
-.Pp
-.Dl "#define foo4random() (arc4random() % ((unsigned)RAND_MAX + 1))"
-.Sh SEE ALSO
-.Xr rand 3 ,
-.Xr random 3 ,
-.Xr srandomdev 3
-.Sh HISTORY
-.Pa RC4
-has been designed by RSA Data Security, Inc.
-It was posted anonymously
-to the USENET and was confirmed to be equivalent by several sources who
-had access to the original cipher.
-Since
-.Pa RC4
-used to be a trade secret, the cipher is now referred to as
-.Pa ARC4 .