Atheros, the manufacturer of the wifi chip seems perfectly reasonable to me?
According to this discussion
http://logsoku.com/thread/hibari.2ch...98556348/1-100, it's the Google Framework Service. However, I don't have Google's certs lying around to sign the apk.
Found an udpate.zip over at xda. A few posts after this:
http://forum.xda-developers.com/show...915354&page=50. The zip actually supplies the sign keys itself.
So back to the recovery for now.