Fast file digesting

Well, in case someone would ever try rock-solid digesting, here're my five cents on this matter:
Whirlpool is slow
Btw, the implemetation done by Paulo S.L.M. Barreto and Vincent Rijmen seems to be rarely used. There's no method to update with an array of bytes from a given offs position. Kinda ugly when you try to inject digesting amid a stack of Streams and/or ByteChannels.
I guess it's better to stick with CRC32, or something that very basic.

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