Bug

[vinaychandra]

Would not work with CRCccitt

You are setting xor as "" in setCRCccitt and then raising an exception in compute when xor is empty.
You would get an Invalid Parameters exception

[killercode]

Hi, thanks for the feed back. Feel free to make a pull request with correction and contribute

[timredfern]

I see the same issue. however the results of the calculations aren't correct when the bug is fixed so I can't really be bothered to constribute