Merge pull request #634 from reaperhulk/rsa-signing-interfaces

RSA Sign/Verify Interfaces

2 files changed, 52 insertions, 0 deletions

diff --git a/cryptography/hazmat/backends/interfaces.py b/cryptography/hazmat/backends/interfaces.py
index b867f26a..a543ba1f 100644
--- a/cryptography/hazmat/backends/interfaces.py
+++ b/cryptography/hazmat/backends/interfaces.py
@@ -90,3 +90,18 @@ class RSABackend(six.with_metaclass(abc.ABCMeta)):
         Generate an RSAPrivateKey instance with public_exponent and a modulus
         of key_size bits.
         """
+
+    @abc.abstractmethod
+    def create_rsa_signature_ctx(self, private_key, padding, algorithm):
+        """
+        Returns an object conforming to the AsymmetricSignatureContext
+        interface.
+        """
+
+    @abc.abstractmethod
+    def create_rsa_verification_ctx(self, public_key, signature, padding,
+                                    algorithm):
+        """
+        Returns an object conforming to the AsymmetricVerificationContext
+        interface.
+        """
diff --git a/cryptography/hazmat/primitives/interfaces.py b/cryptography/hazmat/primitives/interfaces.py
index 5ef469d0..11696160 100644
--- a/cryptography/hazmat/primitives/interfaces.py
+++ b/cryptography/hazmat/primitives/interfaces.py
@@ -287,6 +287,43 @@ class RSAPublicKey(six.with_metaclass(abc.ABCMeta)):
         """
 
 
+class AsymmetricSignatureContext(six.with_metaclass(abc.ABCMeta)):
+    @abc.abstractmethod
+    def update(self, data):
+        """
+        Processes the provided bytes and returns nothing.
+        """
+
+    @abc.abstractmethod
+    def finalize(self):
+        """
+        Returns the signature as bytes.
+        """
+
+
+class AsymmetricVerificationContext(six.with_metaclass(abc.ABCMeta)):
+    @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.
+        """
+
+
+class AsymmetricPadding(six.with_metaclass(abc.ABCMeta)):
+    @abc.abstractproperty
+    def name(self):
+        """
+        A string naming this padding (e.g. "PSS", "PKCS1").
+        """
+
+
 class KeyDerivationFunction(six.with_metaclass(abc.ABCMeta)):
     @abc.abstractmethod
     def derive(self, key_material):