Added RSABackend to MultiBackend

1 files changed, 6 insertions, 1 deletions

diff --git a/cryptography/hazmat/backends/multibackend.py b/cryptography/hazmat/backends/multibackend.py
index 49a4014d..4de02026 100644
--- a/cryptography/hazmat/backends/multibackend.py
+++ b/cryptography/hazmat/backends/multibackend.py
@@ -16,7 +16,7 @@ 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, PBKDF2HMACBackend
+    CipherBackend, HashBackend, HMACBackend, PBKDF2HMACBackend, RSABackend
 )
 
 
@@ -101,3 +101,8 @@ class MultiBackend(object):
             except UnsupportedAlgorithm:
                 pass
         raise UnsupportedAlgorithm
+
+    def generate_rsa_private_key(self, public_exponent, key_size):
+        for b in self._filtered_backends(RSABackend):
+            return b.generate_rsa_private_key(public_exponent, key_size)
+        raise UnsupportedAlgorithm