What is CryptoKey as seen in log?

3/6/09 10:58:34 AM kernel AirPort: Link Up on en1
3/6/09 10:58:34 AM kernel SetCryptoKey T: len 16, idx 0
3/6/09 10:58:35 AM kernel SetCryptoKey R: len 32, idx 1
There's clearly a temporal association between the first mention (on boot) of AirPort and the CryptoKey, but I am hoping someone can (1) confirm that the AirPort interface is what is using this CryptoKey, and (2) explain what the different parameters (T/R, len, and idx) mean. Is this part of how WPA or some other wireless encryption routine works?
Thanks for the insight!
-Dan

For what it's worth, from sifting around. I found no reference in the kernel. But I did find something in the kernel extensions. Though it's not the exact message.
find /System/Library/Extensions -depth -type f -exec strings {} ; | fgrep 'SetCryptoKey'
SetCryptoKey: bad keylen = %d
find /System/Library/Extensions -depth -type f -exec fgrep -l SetCryptoKey {} ;
/System/Library/Extensions/IO80211Family.kext/Contents/PlugIns/AppleAirPortBrcm4311.kext/Contents/MacOS/AppleAirPortBrcm4311
nm /System/Library/Extensions/IO80211Family.kext/Contents/PlugIns/AppleAirPortBrcm4311.kext/Contents/MacOS/AppleAirPortBrcm4311 | less
00004b9c T _ZN16AirPort_Brcm43xx12SetCryptoKeyEPhiiS0_bP10etheraddr

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