TL;DR

10x faster than https://github.com/ebfe/keccak

Usage

import "github.com/steakknife/keccak"

...

h := keccak.New256()
h.Write([]byte("Awesome"))
keccakhash := h.Sum(nil)

keccak cgo

PASS
BenchmarkKeccak224Write1MiB      100      11056848 ns/op
BenchmarkKeccak224Sum         500000          3870 ns/op
BenchmarkKeccak256Write1MiB      100      10845596 ns/op
BenchmarkKeccak256Sum         500000          4010 ns/op
BenchmarkKeccak384Write1MiB      100      15315352 ns/op
BenchmarkKeccak384Sum         500000          4004 ns/op
BenchmarkKeccak512Write1MiB      100      21881999 ns/op
BenchmarkKeccak512Sum         500000          3807 ns/op
ok

https://github.com/ebfe/keccak

PASS
BenchmarkKeccak224Write1MiB       20     116710461 ns/op
BenchmarkKeccak224Sum         100000         17185 ns/op
BenchmarkKeccak256Write1MiB       20     117566765 ns/op
BenchmarkKeccak256Sum         100000         17011 ns/op
BenchmarkKeccak384Write1MiB       10     160507004 ns/op
BenchmarkKeccak384Sum         100000         17076 ns/op
BenchmarkKeccak512Write1MiB       10     229374464 ns/op
BenchmarkKeccak512Sum         100000         17011 ns/op
ok

optimized 64-bit implementation borrowed from http://csrc.nist.gov/groups/ST/hash/sha-3/Round3/documents/Keccak_FinalRnd.zip

tests borrowed from https://github.com/ebfe/keccak