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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 pkg_resources
from cryptography.hazmat.backends.multibackend import MultiBackend
_available_backends_list = None
def _available_backends():
global _available_backends_list
if _available_backends_list is None:
_available_backends_list = [
# DeprecatedIn16
# setuptools 11.3 deprecated support for the require parameter to
# load(), and introduced the new resolve() method instead.
# We previously removed this fallback, but users are having issues
# where Python loads an older setuptools due to various syspath
# weirdness.
ep.resolve() if hasattr(ep, "resolve") else ep.load(require=False)
for ep in pkg_resources.iter_entry_points(
"cryptography.backends"
)
]
return _available_backends_list
_default_backend = None
def default_backend():
global _default_backend
if _default_backend is None:
_default_backend = MultiBackend(_available_backends())
return _default_backend
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