add TraditionalOpenSSLSerializationBackend to MultiBackend

1 files changed, 14 insertions, 1 deletions

diff --git a/cryptography/hazmat/backends/multibackend.py b/cryptography/hazmat/backends/multibackend.py
index 6741f045..35e2a093 100644
--- a/cryptography/hazmat/backends/multibackend.py
+++ b/cryptography/hazmat/backends/multibackend.py
@@ -17,7 +17,8 @@ from cryptography import utils
 from cryptography.exceptions import UnsupportedAlgorithm, _Reasons
 from cryptography.hazmat.backends.interfaces import (
     CMACBackend, CipherBackend, DSABackend, EllipticCurveBackend, HMACBackend,
-    HashBackend, PBKDF2HMACBackend, PKCS8SerializationBackend, RSABackend
+    HashBackend, PBKDF2HMACBackend, PKCS8SerializationBackend,
+    RSABackend, TraditionalOpenSSLSerializationBackend
 )
 
 
@@ -28,6 +29,7 @@ from cryptography.hazmat.backends.interfaces import (
 @utils.register_interface(PBKDF2HMACBackend)
 @utils.register_interface(PKCS8SerializationBackend)
 @utils.register_interface(RSABackend)
+@utils.register_interface(TraditionalOpenSSLSerializationBackend)
 @utils.register_interface(DSABackend)
 @utils.register_interface(EllipticCurveBackend)
 class MultiBackend(object):
@@ -312,3 +314,14 @@ class MultiBackend(object):
             "This backend does not support this key serialization.",
             _Reasons.UNSUPPORTED_SERIALIZATION
         )
+
+    def load_traditional_openssl_pem_private_key(self, data, password):
+        for b in self._filtered_backends(
+            TraditionalOpenSSLSerializationBackend
+        ):
+            return b.load_traditional_openssl_pem_private_key(data, password)
+
+        raise UnsupportedAlgorithm(
+            "This backend does not support this key serialization.",
+            _Reasons.UNSUPPORTED_SERIALIZATION
+        )