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from Crypto.Util._raw_api import c_size_t
from Crypto.Hash.cSHAKE128 import cSHAKE_XOF


def _new(data, custom, function):
    # Use Keccak[512]
    return cSHAKE_XOF(data, custom, 512, function)


def new(data=None, custom=None):
    """Return a fresh instance of a cSHAKE256 object.

    Args:
       data (bytes/bytearray/memoryview):
        The very first chunk of the message to hash.
        It is equivalent to an early call to :meth:`update`.
        Optional.
       custom (bytes):
        Optional.
        A customization bytestring (``S`` in SP 800-185).

    :Return: A :class:`cSHAKE_XOF` object
    """

    # Use Keccak[512]
    return cSHAKE_XOF(data, custom, 512, b'')