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