Where do you get 7AEE840000187A011B80C001001100119103F3267D000000000000FF00000000 from, how do you know what its supposed to CRC8 as?

If you go to Cyclic redundancy check you'll see a bunch

CRC-8-CCITT
CRC-8-Dallas/Maxim
CRC-8
CRC-8-SAE J1850
CRC-8-WCDMA
[download]

Digest::CRC mentions CRC-CCITT which I assume is CRC-8-CCITT

This is as far as I looked :) because I couldn't find sample values -- I despise bit shifting and pointless word problems