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36 lines
1.1 KiB
Python
36 lines
1.1 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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import hmac
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import warnings
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from cryptography import utils
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from cryptography.hazmat.bindings._constant_time import lib
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if hasattr(hmac, "compare_digest"):
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def bytes_eq(a, b):
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if not isinstance(a, bytes) or not isinstance(b, bytes):
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raise TypeError("a and b must be bytes.")
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return hmac.compare_digest(a, b)
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else:
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warnings.warn(
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"Support for your Python version is deprecated. The next version of "
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"cryptography will remove support. Please upgrade to a 2.7.x "
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"release that supports hmac.compare_digest as soon as possible.",
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utils.PersistentlyDeprecated2018,
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)
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def bytes_eq(a, b):
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if not isinstance(a, bytes) or not isinstance(b, bytes):
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raise TypeError("a and b must be bytes.")
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return lib.Cryptography_constant_time_bytes_eq(
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a, len(a), b, len(b)
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) == 1
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