Added PBKDF2HMAC support
diff --git a/cryptography/hazmat/backends/multibackend.py b/cryptography/hazmat/backends/multibackend.py
index 035517e..e560c7d 100644
--- a/cryptography/hazmat/backends/multibackend.py
+++ b/cryptography/hazmat/backends/multibackend.py
@@ -16,13 +16,14 @@
from cryptography import utils
from cryptography.exceptions import UnsupportedAlgorithm
from cryptography.hazmat.backends.interfaces import (
- CipherBackend, HashBackend, HMACBackend
+ CipherBackend, HashBackend, HMACBackend, PBKDF2HMACBackend
)
@utils.register_interface(CipherBackend)
@utils.register_interface(HashBackend)
@utils.register_interface(HMACBackend)
+@utils.register_interface(PBKDF2HMACBackend)
class PrioritizedMultiBackend(object):
name = "multibackend"
@@ -69,3 +70,17 @@
except UnsupportedAlgorithm:
pass
raise UnsupportedAlgorithm
+
+ def pbkdf2_hmac_supported(self, algorithm):
+ return any(b.pbkdf2_hmac_supported(algorithm) for b in self._backends)
+
+ def derive_pbkdf2_hmac(self, algorithm, length, salt, iterations,
+ key_material):
+ for b in self._backends:
+ try:
+ return b.derive_pbkdf2_hmac(
+ algorithm, length, salt, iterations, key_material
+ )
+ except UnsupportedAlgorithm:
+ pass
+ raise UnsupportedAlgorithm