documentation for arc4random. this is out of memory, might need

some corrections.

2 files changed, 85 insertions, 2 deletions

diff --git a/lib/libc/crypt/Makefile.inc b/lib/libc/crypt/Makefile.inc
index af67278f440..d3532362319 100644
--- a/lib/libc/crypt/Makefile.inc
+++ b/lib/libc/crypt/Makefile.inc
@@ -1,11 +1,12 @@
-#	$OpenBSD: Makefile.inc,v 1.7 1997/02/16 20:58:11 provos Exp $
+#	$OpenBSD: Makefile.inc,v 1.8 1997/04/15 13:06:54 provos Exp $
 
 .PATH: ${.CURDIR}/arch/${MACHINE_ARCH}/crypt ${.CURDIR}/crypt
 
 SRCS+=	crypt.c morecrypt.c md5crypt.c arc4random.c blowfish.c
 SRCS+=  bcrypt.c
 
-MAN+=	crypt.3 blowfish.3
+MAN+=	crypt.3 blowfish.3 arc4random.3
 MLINKS+=crypt.3 encrypt.3 crypt.3 setkey.3 crypt.3 des_cipher.3
 MLINKS+=crypt.3 des_setkey.3 blowfish.3 blf_key.3 blowfish.3 blf_enc.3
 MLINKS+=blowfish.3 blf_dec.3
+MLINKS+=arc4ranom.3 arc4random_stir.3 arc4random.3 arc4random_addrandom.3
diff --git a/lib/libc/crypt/arc4random.3 b/lib/libc/crypt/arc4random.3
new file mode 100644
index 00000000000..71a3c003f6f
--- /dev/null
+++ b/lib/libc/crypt/arc4random.3
@@ -0,0 +1,82 @@
+.\" $OpenBSD: arc4random.3,v 1.1 1997/04/15 13:06:54 provos 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 April 15, 1997
+.Dt ARC4RANDOM 3
+.Os "OpenBSD 2.0"
+.Sh NAME
+.Nm arc4random,
+.Nm arc4random_stir,
+.Nm arc4random_addrandom
+.Nd arc4 random number generator.
+.Sh SYNOPSIS
+.Fd #include <stdlib.h>
+.Ft void
+.Fn arc4random "void"
+.Ft void
+.Fn arc4random_stir "void"
+.Ft void
+.Fn arc4random_addrandom "u_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.
+.Pp
+The
+.Fn arc4random_stir
+function reads data from 
+.Pa /dev/arandom
+and uses it to permutate 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 initalizes itself.
+.Sh SEE ALSO
+.Xr rand 3 ,
+.Xr random 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 by a trade secret, the cipher is now refered to as 
+.Pa ARC4 .