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NAME

     ieee80211_crypto_attach, ieee80211_crypto_detach, ieee80211_wep_crypt -
     802.11 WEP encryption functions

SYNOPSIS

     void
     ieee80211_crypto_attach(struct ifnet *ifp);

     void
     ieee80211_crypto_detach(struct ifnet *ifp);

     struct mbuf *
     ieee80211_wep_crypt(struct ifnet *ifp, struct mbuf *m0, int txflag);

DESCRIPTION

     These functions provide software encryption support for 802.11 device
     drivers.

     The ieee80211_crypto_attach() function initializes crypto support for the
     interface ifp, and sets the initialization vector (IV) for WEP encryption
     to a random number derived from a secure PRNG.

     The ieee80211_crypto_detach() function frees data structures associated
     with crypto support for the interface ifp.

     The ieee80211_wep_crypt() function runs the appropriate WEP encryption
     algorithm over the 802.11 encapsulated frame held in the mbuf chain m0,
     for transmission or reception on the interface ifp.  The 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.

IMPLEMENTATION NOTES

     The ieee80211_wep_crypt() function stores its IV in the interface’s
     embedded struct ieee80211com instance.

SEE ALSO

     awi(4), wi(4), arc4random(9), ieee80211(9), ifnet(9)

HISTORY

     The ieee80211 series of functions first appeared in NetBSD 1.5, and were
     later ported to FreeBSD 4.6.

AUTHORS

     This manual page was written by Bruce M. Simpson 〈bms@FreeBSD.org〉 and
     Darron Broad 〈darron@kewl.org〉.