add create_x509_crl interface

3 files changed, 19 insertions, 0 deletions

diff --git a/src/cryptography/hazmat/backends/interfaces.py b/src/cryptography/hazmat/backends/interfaces.py
index 92d9653a..a1d6f812 100644
--- a/src/cryptography/hazmat/backends/interfaces.py
+++ b/src/cryptography/hazmat/backends/interfaces.py
@@ -292,6 +292,13 @@ class X509Backend(object):
         Create and sign an X.509 certificate from a CertificateBuilder object.
         """
 
+    @abc.abstractmethod
+    def create_x509_crl(self, builder, private_key, algorithm):
+        """
+        Create and sign an X.509 CertificateRevocationList from a
+        CertificateRevocationListBuilder object.
+        """
+
 
 @six.add_metaclass(abc.ABCMeta)
 class DHBackend(object):
diff --git a/src/cryptography/hazmat/backends/multibackend.py b/src/cryptography/hazmat/backends/multibackend.py
index bbaaf424..ebecb364 100644
--- a/src/cryptography/hazmat/backends/multibackend.py
+++ b/src/cryptography/hazmat/backends/multibackend.py
@@ -384,3 +384,12 @@ class MultiBackend(object):
             "This backend does not support X.509.",
             _Reasons.UNSUPPORTED_X509
         )
+
+    def create_x509_crl(self, builder, private_key, algorithm):
+        for b in self._filtered_backends(X509Backend):
+            return b.create_x509_crl(builder, private_key, algorithm)
+
+        raise UnsupportedAlgorithm(
+            "This backend does not support X.509.",
+            _Reasons.UNSUPPORTED_X509
+        )
diff --git a/src/cryptography/hazmat/backends/openssl/backend.py b/src/cryptography/hazmat/backends/openssl/backend.py
index e69554f9..74f4285d 100644
--- a/src/cryptography/hazmat/backends/openssl/backend.py
+++ b/src/cryptography/hazmat/backends/openssl/backend.py
@@ -1455,6 +1455,9 @@ class Backend(object):
 
         return _Certificate(self, x509_cert)
 
+    def create_x509_crl(self, builder, private_key, algorithm):
+        pass
+
     def load_pem_private_key(self, data, password):
         return self._load_key(
             self._lib.PEM_read_bio_PrivateKey,