.\"	$OpenBSD: ieee80211_crypto.9,v 1.2 2005/04/04 13:58:25 jmc Exp $
.\"
.\" Copyright (c) 2004 Bruce M. Simpson <bms@spc.org>
.\" Copyright (c) 2004 Darron Broad <darron@kewl.org>
.\" All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" $FreeBSD: src/share/man/man9/ieee80211_crypto.9,v 1.2 2004/07/07 12:59:39 ru Exp $
.\" $Id: ieee80211_crypto.9,v 1.2 2005/04/04 13:58:25 jmc Exp $
.\"
.Dd March 2, 2004
.Dt IEEE80211_CRYPTO 9
.Os
.Sh NAME
.Nm ieee80211_crypto_attach , ieee80211_crypto_detach , ieee80211_wep_crypt
.Nd 802.11 WEP encryption functions
.Sh SYNOPSIS
.Ft void
.Fn ieee80211_crypto_attach "struct ifnet *ifp"
.Ft void
.Fn ieee80211_crypto_detach "struct ifnet *ifp"
.Ft struct mbuf *
.Fn ieee80211_wep_crypt "struct ifnet *ifp" "struct mbuf *m0" "int txflag"
.Sh DESCRIPTION
These functions provide software encryption support
for 802.11 device drivers.
.Pp
.\"
The
.Fn ieee80211_crypto_attach
function initializes crypto support for the interface
.Fa ifp ,
and sets the initialization vector (IV) for WEP encryption to
a random number derived from a secure PRNG.
.Pp
.\"
The
.Fn ieee80211_crypto_detach
function frees data structures associated with crypto support
for the interface
.Fa ifp .
.Pp
.\"
The
.Fn ieee80211_wep_crypt
function runs the appropriate WEP encryption algorithm over the 802.11
encapsulated frame held in the mbuf chain
.Fa m0 ,
for transmission or reception on the interface
.Fa ifp .
The
.Fa txflag
argument specifies whether the frame is being received or transmitted.
A value of 0 indicates that the frame is being received and should
therefore be decrypted; a non-zero value indicates that the frame
is being transmitted
and should be encrypted.
.\"
.Sh IMPLEMENTATION NOTES
The
.Fn ieee80211_wep_crypt
function stores its IV in the interface's embedded
.Vt struct ieee80211com
instance.
.Sh SEE ALSO
.Xr ieee80211 9
.Sh HISTORY
The
.Nm ieee80211
series of functions first appeared in
.Nx 1.5 ,
and were later ported to
.Fx 4.6
and
.Ox 3.6 .
.Sh AUTHORS
This man page was written by
.An Bruce M. Simpson Aq bms@FreeBSD.org
and
.An Darron Broad Aq darron@kewl.org .