Information about CRC calculations

Can someone point me to the file scattered around the docs described as

See protocol.hpp for CRC details

I see one, but it does not provide much info about CRC and how to test for valid calculations.

I would prefer a pointer to the file in github…

Thanks
-John

This is about all I got sorry https://github.com/madcowswe/ODrive/blob/master/Firmware/fibre/cpp/include/fibre/crc.hpp