Fixed #2121 -- added __eq__ and __ne__ to CSRs
diff --git a/src/cryptography/x509.py b/src/cryptography/x509.py
index afd28f2..b36258a 100644
--- a/src/cryptography/x509.py
+++ b/src/cryptography/x509.py
@@ -1391,6 +1391,18 @@
 
 @six.add_metaclass(abc.ABCMeta)
 class CertificateSigningRequest(object):
+    @abc.abstracmethod
+    def __eq__(self, other):
+        """
+        Checks equality.
+        """
+
+    @abc.abstractmethod
+    def __ne__(self, other):
+        """
+        Checks not equal.
+        """
+
     @abc.abstractmethod
     def public_key(self):
         """