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# coding: utf-8 from __future__ import unicode_literals, division, absolute_import, print_function import sys from ._errors import pretty_message from ._types import type_name, byte_cls if sys.platform == 'darwin': from ._mac.util import rand_bytes elif sys.platform == 'win32': from ._win.util import rand_bytes else: from ._openssl.util import rand_bytes __all__ = [ 'constant_compare', 'rand_bytes', ] def constant_compare(a, b): """ Compares two byte strings in constant time to see if they are equal :param a: The first byte string :param b: The second byte string :return: A boolean if the two byte strings are equal """ if not isinstance(a, byte_cls): raise TypeError(pretty_message( ''' a must be a byte string, not %s ''', type_name(a) )) if not isinstance(b, byte_cls): raise TypeError(pretty_message( ''' b must be a byte string, not %s ''', type_name(b) )) if len(a) != len(b): return False if sys.version_info < (3,): a = [ord(char) for char in a] b = [ord(char) for char in b] result = 0 for x, y in zip(a, b): result |= x ^ y return result == 0
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