From Jouni Malinen <jkmaline@cc.hut.fi>

Added Michael MIC keyed digest for TKIP (IEEE 802.11i/WPA). This algorithm
is quite weak due to the requirements for compatibility with old legacy
wireless LAN hardware that does not have much CPU power. Consequently, this
should not really be used with anything else than TKIP.

Michael MIC is calculated over the payload of the IEEE 802.11 header which
makes it easier to add TKIP support for old wireless LAN cards. An additional
authenticated data area is used (but not send separately) to authenticate
source and destination addresses.