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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


_default_backend = None


def default_backend():
    global _default_backend

    if _default_backend is None:
        from cryptography.hazmat.backends.openssl.backend import backend

        _default_backend = backend

    return _default_backend


def _get_backend(backend):
    if backend is None:
        return default_backend()
    else:
        return backend