Whirlpool-1 is a Whirlpool family algorithm invented in 2001 by Paulo S. L. M. Barreto, Vincent Rijmen . It is also known as Whirlpool and is mainly used in TrueCrypt- data encryption software.

The digest (hash generated by this algorithm) is 512 bits (64 Bytes) in length.

You can read more about it on this page.