Add CertIssuerSource interface and CertIssuerSourceStatic implementation.

net/data/cert_issuer_source_static_unittest/generate-certs.py

+#!/usr/bin/env python
+# Copyright 2016 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.
+
+"""Certificates for testing issuer lookup.
+
+               Root
+             /|    |
+            / |    |
+           /  |    |
+          /   |    |
+         /    |    |
+        v     v    v
+      I1_1  i1_2   I2
+        |    |     |
+        |    |     |
+        |    |     |
+        |    |     |
+        v    v     v
+       C1    C2    D
+
+I1 (i1_1.pem) and i1 (i1_2.pem) have subjects that are equal after

[eroman, 2016/06/01 23:30:23]

are these names updated? (I don't see i1 in the diagram above)

[mattm, 2016/06/01 23:48:33]

That's i1_2 in the diagram. I can't have the diagram match both the subject name
and the file name at the same time due to case insensitive filesystems.

+normalization.
+
+C1 and C2 should (attempt to) chain up through both I1 and i1, since I1 and i1
+have the same the name (after normalization).
+"""
+
+import os
+import sys
+sys.path += [os.path.join('..', 'verify_certificate_chain_unittest')]
+
+import common
+
+
+def write_cert_to_file(cert, filename):
+  common.write_string_to_file(
+      "Generated by %s.\n"
+      "Refer to generator script docstring for details.\n%s" % (
+          sys.argv[0], cert.get_cert_pem()),
+      filename)
+
+
+# Self-signed root certificate
+root = common.create_self_signed_root_certificate('Root')
+write_cert_to_file(root, 'root.pem')
+
+
+# Intermediary certificates
+i1_1 = common.create_intermediary_certificate('I1', root)
+write_cert_to_file(i1_1, 'i1_1.pem')
+
+# same name (after normalization), different key
+i1_2 = common.create_intermediary_certificate('i1', root)
+write_cert_to_file(i1_2, 'i1_2.pem')
+
+# different name
+i2 = common.create_intermediary_certificate('I2', root)
+write_cert_to_file(i2, 'i2.pem')
+
+
+# target certs
+
+c1 = common.create_end_entity_certificate('C1', i1_1)
+write_cert_to_file(c1, 'c1.pem')
+
+c2 = common.create_end_entity_certificate('C2', i1_2)
+write_cert_to_file(c2, 'c2.pem')
+
+d = common.create_end_entity_certificate('D', i2)
+write_cert_to_file(d, 'd.pem')
+
+