[bug] use scrypt lib if an old cryptography found

1 files changed, 7 insertions, 5 deletions

diff --git a/src/leap/soledad/client/_scrypt.py b/src/leap/soledad/client/_scrypt.py
index 2de3ab5e..03dcab40 100644
--- a/src/leap/soledad/client/_scrypt.py
+++ b/src/leap/soledad/client/_scrypt.py
@@ -15,11 +15,13 @@
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
-from cryptography.hazmat.backends.interfaces import ScryptBackend
-from cryptography.hazmat.backends import default_backend
-
-backend = default_backend()
-OPENSSL_HAS_SCRYPT = isinstance(backend, ScryptBackend)
+try:
+    from cryptography.hazmat.backends.interfaces import ScryptBackend
+    from cryptography.hazmat.backends import default_backend
+    backend = default_backend()
+    OPENSSL_HAS_SCRYPT = isinstance(backend, ScryptBackend)
+except ImportError:
+    OPENSSL_HAS_SCRYPT = False
 
 if OPENSSL_HAS_SCRYPT:
     from cryptography.hazmat.primitives.kdf.scrypt import Scrypt