ieee80211_crypto(9)

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 transmit

ted. 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 be

ing transmitted
and should be encrypted.

IMPLEMENTATION NOTES

The ieee80211_wep_crypt() function stores its IV in the in

terface'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@FreeB

SD.org> and
Darron Broad <darron@kewl.org>.

BSD March 2, 2004

BSD