from sha3 import keccak_256


def keccak(value):
    return keccak_256(value).digest()


assert keccak(b'') == b"\xc5\xd2F\x01\x86\xf7#<\x92~}\xb2\xdc\xc7\x03\xc0\xe5\x00\xb6S\xca\x82';{\xfa\xd8\x04]\x85\xa4p", "Incorrect sha3.  Make sure it's keccak"  # noqa: E501
