Added PBKDF2HMAC support

1 files changed, 16 insertions, 1 deletions

diff --git a/cryptography/hazmat/backends/multibackend.py b/cryptography/hazmat/backends/multibackend.py
index 035517ea..e560c7df 100644
--- a/cryptography/hazmat/backends/multibackend.py
+++ b/cryptography/hazmat/backends/multibackend.py
@@ -16,13 +16,14 @@ from __future__ import absolute_import, division, print_function
 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 @@ class PrioritizedMultiBackend(object):
             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