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-rw-r--r--cryptography/fernet.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/cryptography/fernet.py b/cryptography/fernet.py
index ef747b7c..e4ee059c 100644
--- a/cryptography/fernet.py
+++ b/cryptography/fernet.py
@@ -13,6 +13,7 @@ from cryptography.hazmat.primitives.block import BlockCipher, ciphers, modes
class Fernet(object):
def __init__(self, key):
super(Fernet, self).__init__()
+ assert len(key) == 32
self.signing_key = key[:16]
self.encryption_key = key[16:]