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39 lines
1.1 KiB
Python
39 lines
1.1 KiB
Python
# 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 asn1crypto.algos import DSASignature
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import six
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from cryptography import utils
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from cryptography.hazmat.primitives import hashes
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def decode_dss_signature(signature):
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data = DSASignature.load(signature, strict=True).native
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return data['r'], data['s']
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def encode_dss_signature(r, s):
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if (
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not isinstance(r, six.integer_types) or
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not isinstance(s, six.integer_types)
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):
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raise ValueError("Both r and s must be integers")
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return DSASignature({'r': r, 's': s}).dump()
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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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