Important files sourced from [here](https://gitlab.com/bettse/iclassreader/-/tree/master/include). Code [over here](https://github.com/flipperdevices/flipperzero-firmware/pull/1298). This is also helpful ([tweet](https://twitter.com/infosecfriends/status/799003935876870144)):

![iClass](https://user-images.githubusercontent.com/57457139/176918175-2bfae56d-3c40-497a-ae0d-1ccaaaac09d1.png)