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
.Vt struct ieee80211com instance.
SEE ALSO
awi(4), wi(4), arc4random(9), ieee80211(9), ifnet(9)
HISTORY
AUTHORS
