57 lines
2.2 KiB
Python
57 lines
2.2 KiB
Python
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# ===================================================================
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#
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# Copyright (c) 2021, Legrandin <helderijs@gmail.com>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# ===================================================================
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from Cryptodome.Util._raw_api import c_size_t
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from Cryptodome.Hash.cSHAKE128 import cSHAKE_XOF
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def _new(data, custom, function):
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# Use Keccak[512]
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return cSHAKE_XOF(data, custom, 512, function)
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def new(data=None, custom=None):
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"""Return a fresh instance of a cSHAKE256 object.
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Args:
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data (bytes/bytearray/memoryview):
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The very first chunk of the message to hash.
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It is equivalent to an early call to :meth:`update`.
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Optional.
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custom (bytes):
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Optional.
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A customization bytestring (``S`` in SP 800-185).
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:Return: A :class:`cSHAKE_XOF` object
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"""
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# Use Keccak[512]
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return cSHAKE_XOF(data, custom, 512, b'')
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