support indexing in CDP

2 files changed, 29 insertions, 0 deletions

diff --git a/src/cryptography/x509/extensions.py b/src/cryptography/x509/extensions.py
index 7979ccb2..97a60a41 100644
--- a/src/cryptography/x509/extensions.py
+++ b/src/cryptography/x509/extensions.py
@@ -379,6 +379,9 @@ class CRLDistributionPoints(object):
     def __ne__(self, other):
         return not self == other
 
+    def __getitem__(self, idx):
+        return self._distribution_points[idx]
+
 
 class DistributionPoint(object):
     def __init__(self, full_name, relative_name, reasons, crl_issuer):
diff --git a/tests/test_x509_ext.py b/tests/test_x509_ext.py
index cfca5794..7e46e5a1 100644
--- a/tests/test_x509_ext.py
+++ b/tests/test_x509_ext.py
@@ -2938,6 +2938,32 @@ class TestCRLDistributionPoints(object):
         assert cdp != cdp4
         assert cdp != object()
 
+    def test_indexing(self):
+        ci = x509.CRLDistributionPoints([
+            x509.DistributionPoint(
+                None, None, None,
+                [x509.UniformResourceIdentifier(u"uri://thing")],
+            ),
+            x509.DistributionPoint(
+                None, None, None,
+                [x509.UniformResourceIdentifier(u"uri://thing2")],
+            ),
+            x509.DistributionPoint(
+                None, None, None,
+                [x509.UniformResourceIdentifier(u"uri://thing3")],
+            ),
+            x509.DistributionPoint(
+                None, None, None,
+                [x509.UniformResourceIdentifier(u"uri://thing4")],
+            ),
+            x509.DistributionPoint(
+                None, None, None,
+                [x509.UniformResourceIdentifier(u"uri://thing5")],
+            ),
+        ])
+        assert ci[-1] == ci[4]
+        assert ci[2:6:2] == [ci[2], ci[4]]
+
 
 @pytest.mark.requires_backend_interface(interface=RSABackend)
 @pytest.mark.requires_backend_interface(interface=X509Backend)