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diff --git a/lib/Crypto/Hash/cSHAKE256.py b/lib/Crypto/Hash/cSHAKE256.py
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+++ b/lib/Crypto/Hash/cSHAKE256.py
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+# ===================================================================
+#
+# Copyright (c) 2021, Legrandin <helderijs@gmail.com>
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+# ===================================================================
+
+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'')