From cd47c4ae14444ba0802d16fdb2960f7665dc9cbd Mon Sep 17 00:00:00 2001
From: Alex Gaynor <alex.gaynor@gmail.com>
Date: Thu, 31 Oct 2013 09:46:27 -0700
Subject: Extra assert

---
 cryptography/fernet.py | 1 +
 1 file changed, 1 insertion(+)

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:]
 
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