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# All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. """ Secret utilities. .. versionadded:: 3.5 """ import hashlib import hmac def _constant_time_compare(first, second): """Return True if both string or binary inputs are equal, otherwise False. This function should take a constant amount of time regardless of how many characters in the strings match. This function uses an approach designed to prevent timing analysis by avoiding content-based short circuiting behaviour, making it appropriate for cryptography. """ first = str(first) second = str(second) if len(first) != len(second): return False result = 0 for x, y in zip(first, second): result |= ord(x) ^ ord(y) return result == 0 try: constant_time_compare = hmac.compare_digest except AttributeError: constant_time_compare = _constant_time_compare try: _ = hashlib.md5(usedforsecurity=False) # nosec def md5(string=b'', usedforsecurity=True): """Return an md5 hashlib object using usedforsecurity parameter For python distributions that support the usedforsecurity keyword parameter, this passes the parameter through as expected. See https://bugs.python.org/issue9216 """ return hashlib.md5(string, usedforsecurity=usedforsecurity) # nosec except TypeError: def md5(string=b'', usedforsecurity=True): """Return an md5 hashlib object without usedforsecurity parameter For python distributions that do not yet support this keyword parameter, we drop the parameter """ return hashlib.md5(string) # nosec
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