This project provides an implementation of the crypto1 cipher, as well as an implementation of the attack specified by the folks in Nijmegen in http://www.sos.cs.ru.nl/applications/rfid/2008-esorics.pdf

I'm not aware of any other public implementations at this time, I decided to write my own.

This code implements the cryptography needed, to decrypt captured communications between crypto1 based tags and readers. And even recover the shared secret.