The firmware work has begun.

The AES code has been imported from an old branch of Orthrus. Layered on top of that is an AES based PRNG, CMAC and OFB mode.

Layered on top of that is the message cryptography. There's a method to create an encrypted version of the message, and one to decrypt and verify a message (returning a true or false depending on whether the message is valid or not).

The next job is to write the IR serial I/O functionality, and then the user interface.

The GitHub repo is linked in the project.

Of course, there's that one method that remains off-limits. Remember that reverse engineering the key protection method is a violation of title 17, section 1201 of US federal law.