diff options
| -rw-r--r-- | cryptography/hazmat/backends/multibackend.py | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/cryptography/hazmat/backends/multibackend.py b/cryptography/hazmat/backends/multibackend.py index 9b91ff45..210efbe8 100644 --- a/cryptography/hazmat/backends/multibackend.py +++ b/cryptography/hazmat/backends/multibackend.py @@ -15,10 +15,11 @@ from __future__ import absolute_import, division, print_function from cryptography import utils from cryptography.exceptions import UnsupportedAlgorithm -from cryptography.hazmat.backends.interfaces import CipherBackend +from cryptography.hazmat.backends.interfaces import CipherBackend, HashBackend @utils.register_interface(CipherBackend) +@utils.register_interface(HashBackend) class PrioritizedMultiBackend(object): name = "multibackend" @@ -43,3 +44,14 @@ class PrioritizedMultiBackend(object): except UnsupportedAlgorithm: pass raise UnsupportedAlgorithm + + def hash_supported(self, algorithm): + return any(b.hash_supported(algorithm) for b in self._backends) + + def create_hash_ctx(self, algorithm): + for b in self._backends: + try: + return b.create_hash_ctx(algorithm) + except UnsupportedAlgorithm: + pass + raise UnsupportedAlgorithm |