hashImpl

ubyte[5] source = [0xff, 0xa1, 0x12, 0x22, 0xff];
ubyte[256 / 8] result;
ubyte[256 / 8] result2;
assert(hashImpl!(0x01, 256)(result[], source[]) == 0);
assert(keccakImpl!(256)(result2[], source[]) == 0);
assert(result[] == result2[]);