Remove deprecated cryptography backend param

Signed-off-by: Ivan Kanakarakis <[email protected]>

Author: c00kiemon5ter

setup.cfg

@@ -48,7 +48,7 @@ scripts =
     tools/parse_xsd2.py
 python_requires = >=3.6, <4
 install_requires =
-    cryptography >= 1.4
+    cryptography >= 3.1
     defusedxml
     pyOpenSSL
     python-dateutil

src/saml2/cryptography/asymmetric.py

@@ -1,15 +1,13 @@
 """This module provides methods for asymmetric cryptography."""
 
-import cryptography.hazmat.backends as _backends
 import cryptography.hazmat.primitives.asymmetric as _asymmetric
 import cryptography.hazmat.primitives.hashes as _hashes
 import cryptography.hazmat.primitives.serialization as _serialization
 
 
 def load_pem_private_key(data, password):
     """Load RSA PEM certificate."""
-    key = _serialization.load_pem_private_key(
-        data, password, _backends.default_backend())
+    key = _serialization.load_pem_private_key(data, password)
     return key
 
 

src/saml2/cryptography/pki.py

@@ -1,9 +1,8 @@
 """This module provides methods for PKI operations."""
 
-import cryptography.hazmat.backends as _backends
 import cryptography.x509 as _x509
 
 
 def load_pem_x509_certificate(data):
     """Load X.509 PEM certificate."""
-    return _x509.load_pem_x509_certificate(data, _backends.default_backend())
+    return _x509.load_pem_x509_certificate(data)

src/saml2/cryptography/symmetric.py

@@ -10,7 +10,6 @@
 from warnings import warn as _warn
 
 import cryptography.fernet as _fernet
-import cryptography.hazmat.backends as _backends
 import cryptography.hazmat.primitives.ciphers as _ciphers
 
 from .errors import SymmetricCryptographyError
@@ -158,10 +157,7 @@ def build_cipher(self, alg='aes_128_cbc'):
         except KeyError:
             raise Exception('Unsupported chaining mode: {}'.format(cmode))
 
-        cipher = _ciphers.Cipher(
-                _ciphers.algorithms.AES(self.key),
-                mode(iv),
-                backend=_backends.default_backend())
+        cipher = _ciphers.Cipher(_ciphers.algorithms.AES(self.key), mode(iv))
 
         return cipher, iv