1 files changed, 35 insertions, 0 deletions
diff --git a/src/cryptography/hazmat/primitives/asymmetric/__init__.py b/src/cryptography/hazmat/primitives/asymmetric/__init__.py
index 4b540884..494a7a13 100644
--- a/src/cryptography/hazmat/primitives/asymmetric/__init__.py
+++ b/src/cryptography/hazmat/primitives/asymmetric/__init__.py
@@ -3,3 +3,38 @@
 # for complete details.
 
 from __future__ import absolute_import, division, print_function
+
+import abc
+
+import six
+
+
+@six.add_metaclass(abc.ABCMeta)
+class AsymmetricSignatureContext(object):
+    @abc.abstractmethod
+    def update(self, data):
+        """
+        Processes the provided bytes and returns nothing.
+        """
+
+    @abc.abstractmethod
+    def finalize(self):
+        """
+        Returns the signature as bytes.
+        """
+
+
+@six.add_metaclass(abc.ABCMeta)
+class AsymmetricVerificationContext(object):
+    @abc.abstractmethod
+    def update(self, data):
+        """
+        Processes the provided bytes and returns nothing.
+        """
+
+    @abc.abstractmethod
+    def verify(self):
+        """
+        Raises an exception if the bytes provided to update do not match the
+        signature or the signature does not match the public key.
+        """