diff options
Diffstat (limited to 'src/cryptography/x509/extensions.py')
| -rw-r--r-- | src/cryptography/x509/extensions.py | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/src/cryptography/x509/extensions.py b/src/cryptography/x509/extensions.py index c78c76c2..5bef9945 100644 --- a/src/cryptography/x509/extensions.py +++ b/src/cryptography/x509/extensions.py @@ -48,17 +48,17 @@ def _key_identifier_from_public_key(public_key): serialization.PublicFormat.SubjectPublicKeyInfo ) - public_key_info = DERReader(serialized).read_single_element(SEQUENCE) - algorithm = public_key_info.read_element(SEQUENCE) - public_key = public_key_info.read_element(BIT_STRING) - public_key_info.check_empty() + reader = DERReader(serialized) + with reader.read_single_element(SEQUENCE) as public_key_info: + algorithm = public_key_info.read_element(SEQUENCE) + public_key = public_key_info.read_element(BIT_STRING) # Double-check the algorithm structure. - algorithm.read_element(OBJECT_IDENTIFIER) - if not algorithm.is_empty(): - # Skip the optional parameters field. - algorithm.read_any_element() - algorithm.check_empty() + with algorithm: + algorithm.read_element(OBJECT_IDENTIFIER) + if not algorithm.is_empty(): + # Skip the optional parameters field. + algorithm.read_any_element() # BIT STRING contents begin with the number of padding bytes added. It # must be zero for SubjectPublicKeyInfo structures. |