mirror of
https://github.com/PiBrewing/craftbeerpi4.git
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42 lines
1.2 KiB
Python
42 lines
1.2 KiB
Python
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# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
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from __future__ import absolute_import, division, print_function
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from cryptography import utils
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from cryptography.hazmat._der import (
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DERReader,
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INTEGER,
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SEQUENCE,
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encode_der,
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encode_der_integer,
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)
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from cryptography.hazmat.primitives import hashes
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def decode_dss_signature(signature):
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with DERReader(signature).read_single_element(SEQUENCE) as seq:
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r = seq.read_element(INTEGER).as_integer()
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s = seq.read_element(INTEGER).as_integer()
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return r, s
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def encode_dss_signature(r, s):
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return encode_der(
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SEQUENCE,
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encode_der(INTEGER, encode_der_integer(r)),
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encode_der(INTEGER, encode_der_integer(s)),
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)
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class Prehashed(object):
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def __init__(self, algorithm):
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if not isinstance(algorithm, hashes.HashAlgorithm):
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raise TypeError("Expected instance of HashAlgorithm.")
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self._algorithm = algorithm
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self._digest_size = algorithm.digest_size
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digest_size = utils.read_only_property("_digest_size")
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