>Aren't there already CRC32 classes out there you could use without reinventing the wheel? e.g. Google [.net crc32 class] yields http://blogs.msdn.com/b/delay/archive/2009/01/14/free-hash-a-reusable-crc-32-hashalgorithm-implementation-for-net.aspx , amongst others.

The one I use is simply the official polynomial used by CRC32 in PKZip. This is a common class used across the net. I checked the other one you mentioned. That one, I never saw it before. Did you find any advantage in using that one?

>http://msdn.microsoft.com/en-us/library/system.security.cryptography.sha1.aspx

I went into that link and was unable to find anything in regards to CRC32. Is there?