From d203710bba3f2eb15a2e2db38a20305540af2eea Mon Sep 17 00:00:00 2001
From: Alex Gaynor <alex.gaynor@gmail.com>
Date: Fri, 22 Nov 2013 13:12:02 -0800
Subject: Better, but still not covered

---
 cryptography/hazmat/bindings/openssl/backend.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cryptography/hazmat/bindings/openssl/backend.py b/cryptography/hazmat/bindings/openssl/backend.py
index 0071da5d..99f11f45 100644
--- a/cryptography/hazmat/bindings/openssl/backend.py
+++ b/cryptography/hazmat/bindings/openssl/backend.py
@@ -207,7 +207,9 @@ class Backend(object):
             elif func == self.lib.EVP_F_EVP_DECRYPTFINAL_EX:
                 if reason == self.lib.EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH:
                     raise IncorrectPadding
-        assert False
+        raise SystemError(
+            "Unknown error code from OpenSSL, you should probably file a bug"
+        )
 
 
 class GetCipherByName(object):
-- 
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