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freebsd-dev/lib/libc/gen/arc4random.3

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Add arc4random() functions from OpenBSD. They are almost same as our srandomdev(), but can be used inside libraries. random() can't be used inside libraries because it breaks its possible predictable sequence. arc4random() is true random as designed, so its usage is library-safe. Obtained from: OpenBSD
1997-06-14 01:15:41 +00:00
.\" $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
$Id$ -> $FreeBSD$
1999-08-28 00:22:10 +00:00
.\" $FreeBSD$
Add arc4random() functions from OpenBSD. They are almost same as our srandomdev(), but can be used inside libraries. random() can't be used inside libraries because it breaks its possible predictable sequence. arc4random() is true random as designed, so its usage is library-safe. Obtained from: OpenBSD
1997-06-14 01:15:41 +00:00
.\"
.Dd April 15, 1997
.Dt ARC4RANDOM 3
.Os
.Sh NAME
mdoc(7)'fy
1999-10-30 15:12:25 +00:00
.Nm arc4random ,
.Nm arc4random_stir ,
Add arc4random() functions from OpenBSD. They are almost same as our srandomdev(), but can be used inside libraries. random() can't be used inside libraries because it breaks its possible predictable sequence. arc4random() is true random as designed, so its usage is library-safe. Obtained from: OpenBSD
1997-06-14 01:15:41 +00:00
.Nm arc4random_addrandom
.Nd arc4 random number generator.
Introduce ".Lb" macro to libc manpages. More libraries manpages updates following.
2000-04-21 09:42:15 +00:00
.Sh LIBRARY
.Lb libc
Add arc4random() functions from OpenBSD. They are almost same as our srandomdev(), but can be used inside libraries. random() can't be used inside libraries because it breaks its possible predictable sequence. arc4random() is true random as designed, so its usage is library-safe. Obtained from: OpenBSD
1997-06-14 01:15:41 +00:00
.Sh SYNOPSIS
.Fd #include <stdlib.h>
.Ft u_int32_t
.Fn arc4random "void"
.Ft void
.Fn arc4random_stir "void"
.Ft void
Change u_char which require special include to unsigned char
1997-06-14 01:28:59 +00:00
.Fn arc4random_addrandom "unsigned char *dat" "int datlen"
Add arc4random() functions from OpenBSD. They are almost same as our srandomdev(), but can be used inside libraries. random() can't be used inside libraries because it breaks its possible predictable sequence. arc4random() is true random as designed, so its usage is library-safe. Obtained from: OpenBSD
1997-06-14 01:15:41 +00:00
.Sh DESCRIPTION
The
.Fn arc4random
function uses the key stream generator employed by the
Remove single-space hard sentence breaks. These degrade the quality of the typeset output, tend to make diffs harder to read and provide bad examples for new-comers to mdoc.
2000-03-02 09:14:21 +00:00
arc4 cipher, which uses 8*8 8 bit S-Boxes.
The S-Boxes
Add arc4random() functions from OpenBSD. They are almost same as our srandomdev(), but can be used inside libraries. random() can't be used inside libraries because it breaks its possible predictable sequence. arc4random() is true random as designed, so its usage is library-safe. Obtained from: OpenBSD
1997-06-14 01:15:41 +00:00
can be in about
.if t 2\u\s71700\s10\d
.if n (2**1700)
states.
.Pp
The
.Fn arc4random_stir
function reads data from
.Pa /dev/urandom
More typos.
1999-05-09 13:46:31 +00:00
and uses it to permute the S-Boxes via
Add arc4random() functions from OpenBSD. They are almost same as our srandomdev(), but can be used inside libraries. random() can't be used inside libraries because it breaks its possible predictable sequence. arc4random() is true random as designed, so its usage is library-safe. Obtained from: OpenBSD
1997-06-14 01:15:41 +00:00
.Fn arc4random_addrandom .
.Pp
There is no need to call
.Fn arc4random_stir
before using
.Fn arc4random ,
since
.Fn arc4random
More typos.
1999-05-09 13:46:31 +00:00
automatically initializes itself.
Add arc4random() functions from OpenBSD. They are almost same as our srandomdev(), but can be used inside libraries. random() can't be used inside libraries because it breaks its possible predictable sequence. arc4random() is true random as designed, so its usage is library-safe. Obtained from: OpenBSD
1997-06-14 01:15:41 +00:00
.Sh SEE ALSO
.Xr rand 3 ,
.Xr random 3 ,
.Xr srandomdev 3
.Sh HISTORY
.Pa RC4
Remove single-space hard sentence breaks. These degrade the quality of the typeset output, tend to make diffs harder to read and provide bad examples for new-comers to mdoc.
2000-03-02 09:14:21 +00:00
has been designed by RSA Data Security, Inc.
It was posted anonymously
Add arc4random() functions from OpenBSD. They are almost same as our srandomdev(), but can be used inside libraries. random() can't be used inside libraries because it breaks its possible predictable sequence. arc4random() is true random as designed, so its usage is library-safe. Obtained from: OpenBSD
1997-06-14 01:15:41 +00:00
to the USENET and was confirmed to be equivalent by several sources who
Remove single-space hard sentence breaks. These degrade the quality of the typeset output, tend to make diffs harder to read and provide bad examples for new-comers to mdoc.
2000-03-02 09:14:21 +00:00
had access to the original cipher.
Since
Add arc4random() functions from OpenBSD. They are almost same as our srandomdev(), but can be used inside libraries. random() can't be used inside libraries because it breaks its possible predictable sequence. arc4random() is true random as designed, so its usage is library-safe. Obtained from: OpenBSD
1997-06-14 01:15:41 +00:00
.Pa RC4
Typo. Obtained from: OpenBSD
1999-05-09 13:41:19 +00:00
used to be a trade secret, the cipher is now referred to as
Add arc4random() functions from OpenBSD. They are almost same as our srandomdev(), but can be used inside libraries. random() can't be used inside libraries because it breaks its possible predictable sequence. arc4random() is true random as designed, so its usage is library-safe. Obtained from: OpenBSD
1997-06-14 01:15:41 +00:00
.Pa ARC4 .
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