v0.1.7

author: Determinant <[email protected]> 2022-11-17 18:08:59 -0800
committer: Determinant <[email protected]> 2022-11-17 18:08:59 -0800
commit: 8154806fe2fccacdc3dafaa68181a07bcf8d6c4c (patch)
tree: f477e6a005599bb88c18db142c267b9297c6060b /frozen_deps/Cryptodome/Hash/TupleHash128.py
parent: be4dc086591c9bced04a507d127c83811c5700c4 (diff)
1 files changed, 138 insertions, 0 deletions
diff --git a/frozen_deps/Cryptodome/Hash/TupleHash128.py b/frozen_deps/Cryptodome/Hash/TupleHash128.py
new file mode 100644
index 0000000..5c910e4
--- /dev/null
+++ b/frozen_deps/Cryptodome/Hash/TupleHash128.py
@@ -0,0 +1,138 @@
+# ===================================================================
+#
+# 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 bord, is_bytes, tobytes
+
+from . import cSHAKE128
+from .cSHAKE128 import _encode_str, _right_encode
+
+
+class TupleHash(object):
+ """A Tuple hash object.
+ Do not instantiate directly.
+ Use the :func:`new` function.
+ """
+
+ def __init__(self, custom, cshake, digest_size):
+
+ self.digest_size = digest_size
+
+ self._cshake = cshake._new(b'', custom, b'TupleHash')
+ self._digest = None
+
+ def update(self, data):
+ """Authenticate the next byte string in the tuple.
+
+ Args:
+ data (bytes/bytearray/memoryview): The next byte string.
+ """
+
+ if self._digest is not None:
+ raise TypeError("You cannot call 'update' after 'digest' or 'hexdigest'")
+
+ if not is_bytes(data):
+ raise TypeError("You can only call 'update' on bytes")
+
+ self._cshake.update(_encode_str(tobytes(data)))
+
+ return self
+
+ def digest(self):
+ """Return the **binary** (non-printable) digest of the tuple of byte strings.
+
+ :return: The hash digest. Binary form.
+ :rtype: byte string
+ """
+
+ if self._digest is None:
+ self._cshake.update(_right_encode(self.digest_size * 8))
+ self._digest = self._cshake.read(self.digest_size)
+
+ return self._digest
+
+ def hexdigest(self):
+ """Return the **printable** digest of the tuple of byte strings.
+
+ :return: The hash digest. Hexadecimal encoded.
+ :rtype: string
+ """
+
+ return "".join(["%02x" % bord(x) for x in tuple(self.digest())])
+
+ def new(self, **kwargs):
+ """Return a new instance of a TupleHash object.
+ See :func:`new`.
+ """
+
+ if "digest_bytes" not in kwargs and "digest_bits" not in kwargs:
+ kwargs["digest_bytes"] = self.digest_size
+
+ return new(**kwargs)
+
+
+def new(**kwargs):
+ """Create a new TupleHash128 object.
+
+ Args:
+ digest_bytes (integer):
+ Optional. The size of the digest, in bytes.
+ Default is 64. Minimum is 8.
+ digest_bits (integer):
+ Optional and alternative to ``digest_bytes``.
+ The size of the digest, in bits (and in steps of 8).
+ Default is 512. Minimum is 64.
+ custom (bytes):
+ Optional.
+ A customization bytestring (``S`` in SP 800-185).
+
+ :Return: A :class:`TupleHash` object
+ """
+
+ digest_bytes = kwargs.pop("digest_bytes", None)
+ digest_bits = kwargs.pop("digest_bits", None)
+ if None not in (digest_bytes, digest_bits):
+ raise TypeError("Only one digest parameter must be provided")
+ if (None, None) == (digest_bytes, digest_bits):
+ digest_bytes = 64
+ if digest_bytes is not None:
+ if digest_bytes < 8:
+ raise ValueError("'digest_bytes' must be at least 8")
+ else:
+ if digest_bits < 64 or digest_bits % 8:
+ raise ValueError("'digest_bytes' must be at least 64 "
+ "in steps of 8")
+ digest_bytes = digest_bits // 8
+
+ custom = kwargs.pop("custom", b'')
+
+ if kwargs:
+ raise TypeError("Unknown parameters: " + str(kwargs))
+
+ return TupleHash(custom, cSHAKE128, digest_bytes)
author	Determinant <[email protected]>	2022-11-17 18:08:59 -0800
committer	Determinant <[email protected]>	2022-11-17 18:08:59 -0800
commit	8154806fe2fccacdc3dafaa68181a07bcf8d6c4c (patch)
tree	f477e6a005599bb88c18db142c267b9297c6060b /frozen_deps/Cryptodome/Hash/TupleHash128.py
parent	be4dc086591c9bced04a507d127c83811c5700c4 (diff)