https://sergworks.wordpress.com/2015/11/24/any-crc-algorithm/

https://sergworks.wordpress.com/2015/11/24/any-crc-algorithm/

Now TCRC class is documented.

If you have installation problems on "latest and greatest" (actually on any version above Delphi XE) please let me know. 
https://sergworks.wordpress.com/2015/11/24/any-crc-algorithm