Add scripts to generate simple test data for certificate verification.

net/data/verify_certificate_chain_unittest/generate-intermediary-lacks-basic-constraints.py

Index: net/data/verify_certificate_chain_unittest/generate-intermediary-lacks-basic-constraints.py
diff --git a/net/data/verify_certificate_chain_unittest/generate-intermediary-lacks-basic-constraints.py b/net/data/verify_certificate_chain_unittest/generate-intermediary-lacks-basic-constraints.py
new file mode 100755
index 0000000000000000000000000000000000000000..2c9b53484a012e9eb0b24c3337024d80b199ba72
--- /dev/null
+++ b/net/data/verify_certificate_chain_unittest/generate-intermediary-lacks-basic-constraints.py
@@ -0,0 +1,27 @@
+#!/usr/bin/python
+# Copyright (c) 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Certificate chain with 1 intermediary and a trusted root. The intermediary
+lacks the basic constraints extension, and hence is expected to fail validation
+(RFC 5280 requires v3 signing certificates have a BasicConstaints)."""
+
+import common
+
+# Self-signed root certificate (part of trust store).
+root = common.CreateSelfSignedRootCertificate('Root')
+
+# Intermediary that lacks basic constraints.
+intermediary = common.CreateIntermediaryCertificate('Intermediary', root)
+intermediary.GetExtensions().RemoveProperty('basicConstraints')
+
+# Target certificate.
+target = common.CreateEndEntityCertificate('Target', intermediary)
+
+chain = [target, intermediary]
+trusted = [root]
+time = common.DEFAULT_TIME
+verify_result = False
+
+common.WriteTestFile(__doc__, chain, trusted, time, verify_result)