4 files changed, 7 insertions, 7 deletions
diff --git a/tests/hazmat/primitives/test_block.py b/tests/hazmat/primitives/test_block.py
index 53b87341..14f76758 100644
--- a/tests/hazmat/primitives/test_block.py
+++ b/tests/hazmat/primitives/test_block.py
@@ -44,7 +44,7 @@ class DummyMode(object):
 @utils.register_interface(interfaces.CipherAlgorithm)
 class DummyCipher(object):
     name = "dummy-cipher"
-    key_size = 128
+    key_size = None
 
 
 @pytest.mark.requires_backend_interface(interface=CipherBackend)
diff --git a/tests/hazmat/primitives/test_hashes.py b/tests/hazmat/primitives/test_hashes.py
index bab5bfca..4345a7f4 100644
--- a/tests/hazmat/primitives/test_hashes.py
+++ b/tests/hazmat/primitives/test_hashes.py
@@ -34,8 +34,8 @@ from ...utils import raises_unsupported_algorithm
 @utils.register_interface(interfaces.HashAlgorithm)
 class UnsupportedDummyHash(object):
     name = "unsupported-dummy-hash"
-    block_size = 128
-    digest_size = 128
+    block_size = None
+    digest_size = None
 
 
 @pytest.mark.requires_backend_interface(interface=HashBackend)
diff --git a/tests/hazmat/primitives/test_hmac.py b/tests/hazmat/primitives/test_hmac.py
index 01b1cdcb..3553632c 100644
--- a/tests/hazmat/primitives/test_hmac.py
+++ b/tests/hazmat/primitives/test_hmac.py
@@ -33,8 +33,8 @@ from ...utils import raises_unsupported_algorithm
 @utils.register_interface(interfaces.HashAlgorithm)
 class UnsupportedDummyHash(object):
     name = "unsupported-dummy-hash"
-    block_size = 128
-    digest_size = 128
+    block_size = None
+    digest_size = None
 
 
 @pytest.mark.supported(
diff --git a/tests/hazmat/primitives/test_pbkdf2hmac.py b/tests/hazmat/primitives/test_pbkdf2hmac.py
index fa925877..c140c14d 100644
--- a/tests/hazmat/primitives/test_pbkdf2hmac.py
+++ b/tests/hazmat/primitives/test_pbkdf2hmac.py
@@ -31,8 +31,8 @@ from ...utils import raises_unsupported_algorithm
 @utils.register_interface(interfaces.HashAlgorithm)
 class DummyHash(object):
     name = "dummy-hash"
-    block_size = 128
-    digest_size = 128
+    block_size = None
+    digest_size = None
 
 
 class TestPBKDF2HMAC(object):