diff options
Diffstat (limited to 'cryptography/hazmat')
| -rw-r--r-- | cryptography/hazmat/backends/openssl/backend.py | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/cryptography/hazmat/backends/openssl/backend.py b/cryptography/hazmat/backends/openssl/backend.py index 7cfdd284..11731133 100644 --- a/cryptography/hazmat/backends/openssl/backend.py +++ b/cryptography/hazmat/backends/openssl/backend.py @@ -556,8 +556,11 @@ class Backend(object): return self._ffi.buffer(buf)[:res] def cmac_algorithm_supported(self, algorithm): - return (backend._lib.Cryptography_HAS_CMAC == 1 - and backend.cipher_supported(algorithm, CBC(0))) + return ( + backend._lib.Cryptography_HAS_CMAC == 1 + and backend.cipher_supported(algorithm, CBC( + b"\x00" * algorithm.block_size)) + ) def create_cmac_ctx(self, algorithm): return _CMACContext(self, algorithm) |