diff --git a/cryptography/hazmat/primitives/interfaces.py b/cryptography/hazmat/primitives/interfaces.py
index d60f9e0..c7ad0cf 100644
--- a/cryptography/hazmat/primitives/interfaces.py
+++ b/cryptography/hazmat/primitives/interfaces.py
@@ -444,6 +444,15 @@
 
 
 @six.add_metaclass(abc.ABCMeta)
+class EllipticCurvePrivateKeyWithNumbers(EllipticCurvePrivateKey):
+    @abc.abstractmethod
+    def private_numbers(self):
+        """
+        Returns an EllipticCurvePrivateNumbers.
+        """
+
+
+@six.add_metaclass(abc.ABCMeta)
 class EllipticCurvePublicKey(object):
     @abc.abstractmethod
     def verifier(self, signature, signature_algorithm):
@@ -456,3 +465,12 @@
         """
         The EllipticCurve that this key is on.
         """
+
+
+@six.add_metaclass(abc.ABCMeta)
+class EllipticCurvePublicKeyWithNumbers(EllipticCurvePublicKey):
+    @abc.abstractmethod
+    def public_numbers(self):
+        """
+        Returns an EllipticCurvePublicNumbers.
+        """
diff --git a/docs/hazmat/primitives/interfaces.rst b/docs/hazmat/primitives/interfaces.rst
index ac47c1e..14be698 100644
--- a/docs/hazmat/primitives/interfaces.rst
+++ b/docs/hazmat/primitives/interfaces.rst
@@ -492,6 +492,23 @@
         The EllipticCurvePublicKey object for this private key.
 
 
+.. class:: EllipticCurvePrivateKeyWithNumbers
+
+    .. versionadded:: 0.6
+
+    Extends :class:`EllipticCurvePrivateKey`.
+
+    .. method:: private_numbers()
+
+        Create a
+        :class:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePrivateNumbers`
+        object.
+
+        :returns: An
+            :class:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePrivateNumbers`
+            instance.
+
+
 .. class:: EllipticCurvePublicKey
 
     .. versionadded:: 0.5
@@ -518,6 +535,23 @@
         The elliptic curve for this key.
 
 
+.. class:: EllipticCurvePublicKeyWithNumbers
+
+    .. versionadded:: 0.6
+
+    Extends :class:`EllipticCurvePublicKey`.
+
+    .. method:: private_numbers()
+
+        Create a
+        :class:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicNumbers`
+        object.
+
+        :returns: An
+            :class:`~cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePublicNumbers`
+            instance.
+
+
 Hash algorithms
 ---------------