saves up to 72 bytes per context for SHA3-512
The SHA-3 winning algorithm's name is Keccak (pronounced "catch-ack"), not Kekkak. - <http://keccak.noekeon.org/> - <http://www.nist.gov/itl/csd/sha-100212.cfm> - <https://en.wikipedia.org/wiki/SHA-3>