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+# ===================================================================
+#
+# Copyright (c) 2021, Legrandin <[email protected]>
+# 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 Cryptodome.Util.py3compat import is_bytes
+
+from .KMAC128 import KMAC_Hash
+from . import cSHAKE256
+
+
+def new(**kwargs):
+ """Create a new KMAC256 object.
+
+ Args:
+ key (bytes/bytearray/memoryview):
+ The key to use to compute the MAC.
+ It must be at least 256 bits long (32 bytes).
+ data (bytes/bytearray/memoryview):
+ Optional. The very first chunk of the message to authenticate.
+ It is equivalent to an early call to :meth:`KMAC_Hash.update`.
+ mac_len (integer):
+ Optional. The size of the authentication tag, in bytes.
+ Default is 64. Minimum is 8.
+ custom (bytes/bytearray/memoryview):
+ Optional. A customization byte string (``S`` in SP 800-185).
+
+ Returns:
+ A :class:`KMAC_Hash` hash object
+ """
+
+ key = kwargs.pop("key", None)
+ if not is_bytes(key):
+ raise TypeError("You must pass a key to KMAC256")
+ if len(key) < 32:
+ raise ValueError("The key must be at least 256 bits long (32 bytes)")
+
+ data = kwargs.pop("data", None)
+
+ mac_len = kwargs.pop("mac_len", 64)
+ if mac_len < 8:
+ raise ValueError("'mac_len' must be 8 bytes or more")
+
+ custom = kwargs.pop("custom", b"")
+
+ if kwargs:
+ raise TypeError("Unknown parameters: " + str(kwargs))
+
+ return KMAC_Hash(data, key, mac_len, custom, "20", cSHAKE256, 136)