So if I'm right, there's only 8 bytes that are used for encryption key in the Libre 2 protocol. 64-bit is not much for a key. Are they just using DES? I have the cyphertext, and what I _think_ is the correct cleartext. What's my best option to figure this out?
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If you know it's DES and the exact mode and don't have the key, you can crack the key for $30 at http://crack.sh . might get a bit pricy if you're guessing the format/parameters though.
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Unfortunately I can only _guess_ it's DES. What I have is (at least) 64-bit sent Host→Device and at least 2×64-bit sent Device→Host right now. I was trying to set up a second VM just to see if the parts I see constants are really constant, or generated at install.
End of conversation
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