diff options
Diffstat (limited to 'src/cryptography/hazmat/primitives/asymmetric/utils.py')
| -rw-r--r-- | src/cryptography/hazmat/primitives/asymmetric/utils.py | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/cryptography/hazmat/primitives/asymmetric/utils.py b/src/cryptography/hazmat/primitives/asymmetric/utils.py index 5b27654f..44bf59d1 100644 --- a/src/cryptography/hazmat/primitives/asymmetric/utils.py +++ b/src/cryptography/hazmat/primitives/asymmetric/utils.py @@ -13,6 +13,7 @@ from pyasn1.type import namedtype, univ import six from cryptography import utils +from cryptography.hazmat.primitives import hashes class _DSSSigValue(univ.Sequence): @@ -69,3 +70,14 @@ def encode_dss_signature(r, s): sig.setComponentByName('r', r) sig.setComponentByName('s', s) return encoder.encode(sig) + + +class Prehashed(object): + def __init__(self, algorithm): + if not isinstance(algorithm, hashes.HashAlgorithm): + raise TypeError("Expected instance of HashAlgorithm.") + + self._algorithm = algorithm + self._digest_size = algorithm.digest_size + + digest_size = utils.read_only_property("_digest_size") |