add UnrecognizedExtension class

2 files changed, 33 insertions, 1 deletions

diff --git a/src/cryptography/x509/__init__.py b/src/cryptography/x509/__init__.py
index dc19161e..a1deb7f4 100644
--- a/src/cryptography/x509/__init__.py
+++ b/src/cryptography/x509/__init__.py
@@ -21,7 +21,7 @@ from cryptography.x509.extensions import (
     InhibitAnyPolicy, InvalidityDate, IssuerAlternativeName, KeyUsage,
     NameConstraints, NoticeReference, OCSPNoCheck, PolicyInformation,
     ReasonFlags, SubjectAlternativeName, SubjectKeyIdentifier,
-    UnsupportedExtension, UserNotice
+    UnrecognizedExtension, UnsupportedExtension, UserNotice
 )
 from cryptography.x509.general_name import (
     DNSName, DirectoryName, GeneralName, IPAddress, OtherName, RFC822Name,
@@ -169,4 +169,5 @@ __all__ = [
     "CertificateIssuer",
     "CRLReason",
     "InvalidityDate",
+    "UnrecognizedExtension",
 ]
diff --git a/src/cryptography/x509/extensions.py b/src/cryptography/x509/extensions.py
index 4e7a53b6..0c5b5523 100644
--- a/src/cryptography/x509/extensions.py
+++ b/src/cryptography/x509/extensions.py
@@ -1065,3 +1065,34 @@ class InvalidityDate(object):
         return hash(self.invalidity_date)
 
     invalidity_date = utils.read_only_property("_invalidity_date")
+
+
+@utils.register_interface(ExtensionType)
+class UnrecognizedExtension(object):
+    def __init__(self, oid, value):
+        if not isinstance(oid, ObjectIdentifier):
+            raise TypeError("oid must be an ObjectIdentifier")
+        self._oid = oid
+        self._value = value
+
+    oid = utils.read_only_property("_oid")
+    value = utils.read_only_property("_value")
+
+    def __repr__(self):
+        return (
+            "<UnrecognizedExtension(oid={0.oid}, value={0.value!r})>".format(
+                self
+            )
+        )
+
+    def __eq__(self, other):
+        if not isinstance(other, UnrecognizedExtension):
+            return NotImplemented
+
+        return self.oid == other.oid and self.value == other.value
+
+    def __ne__(self, other):
+        return not self == other
+
+    def __hash__(self):
+        return hash((self.oid, self.value))