A practical incremental and one-pass, pure API to the SHA-256 hash algorithm
(including HMAC support) with performance close to the fastest implementations
available in other languages.
NOTE: This package has been forked off 'cryptohash-0.11.7' because the
'cryptohash' package has been deprecated and so this package continues to
satisfy the need for a lightweight package providing the SHA256 hash algorithm
without any dependencies on packages other than 'base' and 'bytestring'.
Consequently, this package can be used as a drop-in replacement for
cryptohash's "Crypto.Hash.SHA256" module, though with a clearly smaller
footprint.
