1.\" 2.\" Copyright (c) 2004 Bruce M. Simpson <bms@spc.org> 3.\" Copyright (c) 2004 Darron Broad <darron@kewl.org> 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.\" $FreeBSD$ 28.\" $Id: ieee80211_crypto.9,v 1.3 2004/03/04 10:42:56 bruce Exp $ 29.\" 30.Dd March 2, 2004 31.Dt ieee80211_crypto 9 32.Os 33.Sh NAME 34.Nm ieee80211_crypto 35.Nd 802.11 WEP encryption functions 36.Sh SYNOPSIS 37.Ft void 38.Fn ieee80211_crypto_attach "struct ifnet *ifp" 39.Ft void 40.Fn ieee80211_crypto_detach "struct ifnet *ifp" 41.Ft struct mbuf * 42.Fn ieee80211_wep_crypt "struct ifnet *ifp" "struct mbuf *m0" "int txflag" 43.Sh DESCRIPTION 44The 45.Nm 46collection of functions provide software encryption support 47for 802.11 device drivers. 48.Pp 49.\" 50The 51.Fn ieee80211_crypto_attach 52function initializes crypto support for the interface 53.Fa ifp , 54and sets the initialization vector (IV) for WEP encryption to 55a random number derived from a secure PRNG. 56.Pp 57.\" 58The 59.Fn ieee80211_crypto_detach 60function frees data structures associated with crypto support 61for the interface 62.Fa ifp . 63.Pp 64.\" 65The 66.Fn ieee80211_wep_crypt 67function runs the appropriate WEP encryption algorithm over the 802.11 68encapsulated frame held in the mbuf chain 69.Fa m0 , 70for transmission or reception on the interface 71.Fa ifp . 72The 73.Fa txflag 74argument specifies whether the frame is being received or transmitted. 75A value of 0 indicates that the frame is being received and should 76therefore be decrypted; a non-zero value indicates that the frame 77and should be encrypted. 78.\" 79.Sh IMPLEMENTATION NOTES 80The 81.Fn ieee80211_wep_crypt 82function stores its IV in the interface's embedded 83.Vt struct ieee80211com 84instance. 85.Sh SEE ALSO 86.Xr awi 4 , 87.Xr wi 4 , 88.Xr arc4random 9 , 89.Xr ieee80211 9 , 90.Xr ifnet 9 91.Sh HISTORY 92The 93.Nm 94series of functions first appeared in 95.Nx 1.5 , 96and were later ported to 97.Fx 4.6 . 98.Sh AUTHORS 99This man page was written by 100.An Bruce M. Simpson Aq bms@FreeBSD.org 101and 102.An Darron Broad Aq darron@kewl.org . 103