Fixup how the digest algorithm is sent

1 files changed, 10 insertions, 4 deletions

diff --git a/cryptography/hazmat/primitives/interfaces.py b/cryptography/hazmat/primitives/interfaces.py
index 5bca9c52..a966d15a 100644
--- a/cryptography/hazmat/primitives/interfaces.py
+++ b/cryptography/hazmat/primitives/interfaces.py
@@ -508,14 +508,20 @@ class EllipticCurve(object):
 
 @six.add_metaclass(abc.ABCMeta)
 class EllipticCurveSignatureAlgorithm(object):
+    @abc.abstractproperty
+    def algorithm(self):
+        """
+        The digest algorithm used with this signature.
+        """
+
     @abc.abstractmethod
-    def signer(self, private_key, algorithm, backend):
+    def signer(self, private_key, backend):
         """
         Returns an AsymmetricSignatureContext used for signing data.
         """
 
     @abc.abstractmethod
-    def verifier(self, public_key, algorithm, backend):
+    def verifier(self, signature, public_key, backend):
         """
         Returns an AsymmetricVerificationContext used for signing data.
         """
@@ -524,7 +530,7 @@ class EllipticCurveSignatureAlgorithm(object):
 @six.add_metaclass(abc.ABCMeta)
 class EllipticCurvePrivateKey(object):
     @abc.abstractmethod
-    def signer(self, signature_algorithm, digest_algorithm, backend):
+    def signer(self, signature_algorithm, backend):
         """
         Returns an AsymmetricSignatureContext used for signing data.
         """
@@ -569,7 +575,7 @@ class EllipticCurvePrivateKey(object):
 @six.add_metaclass(abc.ABCMeta)
 class EllipticCurvePublicKey(object):
     @abc.abstractmethod
-    def verifier(self, signature_algorithm, digest_algorithm, backend):
+    def verifier(self, signature, signature_algorithm, backend):
         """
         Returns an AsymmetricVerificationContext used for signing data.
         """