SHA-2 is the collective name of one-way hash functions developed by the
NIST.  SHA-256, SHA-384, and SHA-512 pertain to hashes whose outputs are
256 bits, 384 bits and 512 bits, respectively.

WWW: http://search.cpan.org/dist/Digest-SHA2/

-- Sergey Skvortsov
skv@FreeBSD.org