Merge pull request #739 from skeuomorf/dsa-backend

DSA backend

1 files changed, 32 insertions, 1 deletions

diff --git a/tests/hazmat/backends/test_multibackend.py b/tests/hazmat/backends/test_multibackend.py
index f0be72b2..f46009d4 100644
--- a/tests/hazmat/backends/test_multibackend.py
+++ b/tests/hazmat/backends/test_multibackend.py
@@ -18,7 +18,8 @@ from cryptography.exceptions import (
     UnsupportedAlgorithm, _Reasons
 )
 from cryptography.hazmat.backends.interfaces import (
-    CipherBackend, HMACBackend, HashBackend, PBKDF2HMACBackend, RSABackend
+    CipherBackend, DSABackend, HMACBackend, HashBackend, PBKDF2HMACBackend,
+    RSABackend
 )
 from cryptography.hazmat.backends.multibackend import MultiBackend
 from cryptography.hazmat.primitives import hashes, hmac
@@ -98,6 +99,15 @@ class DummyRSABackend(object):
         pass
 
 
+@utils.register_interface(DSABackend)
+class DummyDSABackend(object):
+    def generate_dsa_parameters(self, key_size):
+        pass
+
+    def generate_dsa_private_key(self, parameters):
+        pass
+
+
 class TestMultiBackend(object):
     def test_ciphers(self):
         backend = MultiBackend([
@@ -193,3 +203,24 @@ class TestMultiBackend(object):
         ):
             backend.create_rsa_verification_ctx(
                 "public_key", "sig", padding.PKCS1v15(), hashes.MD5())
+
+    def test_dsa(self):
+        backend = MultiBackend([
+            DummyDSABackend()
+        ])
+
+        backend.generate_dsa_parameters(key_size=1024)
+
+        parameters = object()
+        backend.generate_dsa_private_key(parameters)
+
+        backend = MultiBackend([])
+        with raises_unsupported_algorithm(
+            _Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM
+        ):
+            backend.generate_dsa_parameters(key_size=1024)
+
+        with raises_unsupported_algorithm(
+            _Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM
+        ):
+            backend.generate_dsa_private_key(parameters)