[SLUG] fast hashing/checksumming tool

[Dave Kempe <dave@xxxxxxxxxxxxxxxxxxxxx>]

Hi,
I need to checksum recursively alot of data, and store the checksums in 
a database. I can do most via a shell script, but was wondering if 
anyone could recommend a checksumming tool that was the fastest.
I know about md5sum, sha1sum, cfv (not recursive enough). I want to be 
able to produce a checksum of many files (2.1TB worth) for verification 
against other copies of the files in various locations. I need the 
fastest available algorithm, not necessarily the most secure etc.
Any suggestions?

Dave