CRLNumber needs to be a class for reasons.
diff --git a/src/cryptography/x509/extensions.py b/src/cryptography/x509/extensions.py
index 71ce8a1..15feb71 100644
--- a/src/cryptography/x509/extensions.py
+++ b/src/cryptography/x509/extensions.py
@@ -109,6 +109,31 @@
@utils.register_interface(ExtensionType)
+class CRLNumber(object):
+ oid = ExtensionOID.CRL_NUMBER
+
+ def __init__(self, crl_number):
+ if not isinstance(crl_number, six.integer_types):
+ raise TypeError("crl_number must be an integer")
+
+ self._crl_number = crl_number
+
+ def __eq__(self, other):
+ if not isinstance(other, CRLNumber):
+ return NotImplemented
+
+ return self.crl_number == other.crl_number
+
+ def __ne__(self, other):
+ return not self == other
+
+ def __repr__(self):
+ return "<CRLNumber({0})>".format(self.crl_number)
+
+ crl_number = utils.read_only_property("_crl_number")
+
+
+@utils.register_interface(ExtensionType)
class AuthorityKeyIdentifier(object):
oid = ExtensionOID.AUTHORITY_KEY_IDENTIFIER