diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/cryptography/hazmat/backends/__init__.py | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/src/cryptography/hazmat/backends/__init__.py b/src/cryptography/hazmat/backends/__init__.py index e66f9e10..161a1879 100644 --- a/src/cryptography/hazmat/backends/__init__.py +++ b/src/cryptography/hazmat/backends/__init__.py @@ -16,7 +16,7 @@ def _available_backends(): global _available_backends_list if _available_backends_list is None: - _available_backends_list = [ + entry_point_backends = [ # DeprecatedIn16 # setuptools 11.3 deprecated support for the require parameter to # load(), and introduced the new resolve() method instead. @@ -29,8 +29,38 @@ def _available_backends(): ) ] + _available_backends_list = _backend_import_fallback( + entry_point_backends + ) + return _available_backends_list + +def _backend_import_fallback(backends): + # If backends already exist just return them. This branch is here + # to get full line coverage from our tests. + if backends: + return backends + + # if iter_entry_points fails to find any backends then manually try to + # import our current backends as a workaround for issues with application + # bundlers like pyinstaller, cx_freeze, etc + + # OpenSSL is guaranteed to be present until we unbundle the backends. + from cryptography.hazmat.backends.openssl.backend import backend as be_ossl + backends = [be_ossl] + try: + from cryptography.hazmat.backends.commoncrypto.backend import ( + backend as be_cc + ) + except ImportError: + pass + else: + backends.append(be_cc) + + return backends + + _default_backend = None |