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.\"
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.\" Copyright (c) 2004 Bruce M. Simpson <bms@spc.org>
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.\" Copyright (c) 2004 Darron Broad <darron@kewl.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\" $Id: ieee80211_crypto.9,v 1.3 2004/03/04 10:42:56 bruce Exp $
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.\"
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.Dd March 2, 2004
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2004-07-07 12:59:39 +00:00
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.Dt IEEE80211_CRYPTO 9
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.Os
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.Sh NAME
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.Nm ieee80211_crypto_attach , ieee80211_crypto_detach , ieee80211_wep_crypt
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.Nd 802.11 WEP encryption functions
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.Sh SYNOPSIS
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.Ft void
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.Fn ieee80211_crypto_attach "struct ifnet *ifp"
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.Ft void
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.Fn ieee80211_crypto_detach "struct ifnet *ifp"
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.Ft struct mbuf *
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.Fn ieee80211_wep_crypt "struct ifnet *ifp" "struct mbuf *m0" "int txflag"
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.Sh DESCRIPTION
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These functions provide software encryption support
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for 802.11 device drivers.
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.Pp
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.\"
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The
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.Fn ieee80211_crypto_attach
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function initializes crypto support for the interface
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.Fa ifp ,
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and sets the initialization vector (IV) for WEP encryption to
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a random number derived from a secure PRNG.
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.Pp
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.\"
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The
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.Fn ieee80211_crypto_detach
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function frees data structures associated with crypto support
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for the interface
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.Fa ifp .
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.Pp
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.\"
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The
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.Fn ieee80211_wep_crypt
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function runs the appropriate WEP encryption algorithm over the 802.11
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encapsulated frame held in the mbuf chain
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.Fa m0 ,
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for transmission or reception on the interface
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.Fa ifp .
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The
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.Fa txflag
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argument specifies whether the frame is being received or transmitted.
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A value of 0 indicates that the frame is being received and should
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therefore be decrypted; a non-zero value indicates that the frame
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is being transmitted
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and should be encrypted.
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.\"
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.Sh IMPLEMENTATION NOTES
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The
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.Fn ieee80211_wep_crypt
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function stores its IV in the interface's embedded
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.Vt struct ieee80211com
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instance.
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.Sh SEE ALSO
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.Xr awi 4 ,
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.Xr wi 4 ,
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.Xr arc4random 9 ,
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.Xr ieee80211 9 ,
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.Xr ifnet 9
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.Sh HISTORY
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The
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.Nm ieee80211
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series of functions first appeared in
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.Nx 1.5 ,
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and were later ported to
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.Fx 4.6 .
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.Sh AUTHORS
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.An -nosplit
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2005-06-28 20:15:19 +00:00
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This manual page was written by
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2004-03-04 12:52:10 +00:00
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.An Bruce M. Simpson Aq bms@FreeBSD.org
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and
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.An Darron Broad Aq darron@kewl.org .
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