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# This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. from __future__ import absolute_import, division, print_function import hmac import warnings from cryptography import utils from cryptography.hazmat.bindings._constant_time import lib if hasattr(hmac, "compare_digest"): def bytes_eq(a, b): if not isinstance(a, bytes) or not isinstance(b, bytes): raise TypeError("a and b must be bytes.") return hmac.compare_digest(a, b) else: warnings.warn( "Support for your Python version is deprecated. The next version of " "cryptography will remove support. Please upgrade to a 2.7.x " "release that supports hmac.compare_digest as soon as possible.", utils.DeprecatedIn23, ) def bytes_eq(a, b): if not isinstance(a, bytes) or not isinstance(b, bytes): raise TypeError("a and b must be bytes.") return lib.Cryptography_constant_time_bytes_eq( a, len(a), b, len(b) ) == 1
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