Add BLAKE2 support to Digest
BLAKE2 is a fast, modern hash function, based on improvements to the BLAKE function, which was a SHA3 finalist. BLAKE2 performs about twice as fast in software as SHA3 winner Keccak:
BLAKE2 has received an informational RFC 7693 from the IETF:
It was added to the Python standard library in Python 3.6:
If there's interest in supporting BLAKE2 in the Ruby standard library, I can put together a patch.