commit 590692fe6a071b3c694ae8966b84b45ece9b1a07
author David Benjamin <davidben@davidben.net> Sat May 12 15:07:21 2018 -0400
committer Alex Gaynor <alex.gaynor@gmail.com> Sat May 12 15:07:21 2018 -0400
tree 9a41ccdca9bcb0feeffe172c2827f288ed28342d
parent 617825d026a933e355d644ba12a408c63b8fb20f

Check for CMAC_Init errors. (#4232)

src/cryptography/hazmat/backends/openssl/cmac.py

diff --git a/src/cryptography/hazmat/backends/openssl/cmac.py b/src/cryptography/hazmat/backends/openssl/cmac.py
index 5919017..e20f66d 100644
--- a/src/cryptography/hazmat/backends/openssl/cmac.py
+++ b/src/cryptography/hazmat/backends/openssl/cmac.py
@@ -36,10 +36,11 @@
             self._backend.openssl_assert(ctx != self._backend._ffi.NULL)
             ctx = self._backend._ffi.gc(ctx, self._backend._lib.CMAC_CTX_free)
 
-            self._backend._lib.CMAC_Init(
+            res = self._backend._lib.CMAC_Init(
                 ctx, self._key, len(self._key),
                 evp_cipher, self._backend._ffi.NULL
             )
+            self._backend.openssl_assert(res == 1)
 
         self._ctx = ctx