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-.\" $OpenBSD: arc4random.3,v 1.27 2008/12/23 18:31:02 deraadt 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: December 23 2008 $
-.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 SYNOPSIS
-.Fd #include <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 "u_char *dat" "int datlen"
-.Sh DESCRIPTION
-The
-.Fn arc4random
-function provides a high quality 32-bit pseudo-random
-number very quickly.
-.Fn arc4random
-seeds itself on a regular basis from the kernel strong random number
-subsystem described in
-.Xr random 4 .
-On each call, an ARC4 generator is used to generate a new result.
-The
-.Fn arc4random
-function uses the ARC4 cipher key stream generator,
-which uses 8*8 8-bit S-Boxes.
-The S-Boxes can be in about (2**1700) states.
-.Pp
-.Fn arc4random
-fits into a middle ground not covered by other subsystems such as
-the strong, slow, and resource expensive random
-devices described in
-.Xr random 4
-versus the fast but poor quality interfaces described in
-.Xr rand 3 ,
-.Xr random 3 ,
-and
-.Xr drand48 3 .
-.Pp
-.Fn arc4random_buf
-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 using
-.Xr sysctl 3
-from
-.Va kern.arandom
-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 ,
-since
-.Fn arc4random
-automatically initializes itself.
-.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
-An algorithm called
-.Pa RC4
-was designed by RSA Data Security, Inc.
-It was considered a trade secret.
-Because it was a trade secret, it obviously could not be patented.
-A clone of this was posted anonymously to USENET and confirmed to
-be equivalent by several sources who had access to the original cipher.
-Because of the trade secret situation, RSA Data Security, Inc. could
-do nothing about the release of the
-.Ql Alleged RC4
-algorithm.
-Since
-.Pa RC4
-was trademarked, the cipher is now referred to as
-.Pa ARC4 .
-.Pp
-These functions first appeared in
-.Ox 2.1 .