Implements secure sockets on Mac OS with SecureTransport API

tests/standalone/io/secure_server_client_certificate_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "dart:async";
 import "dart:io";
 
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
 
@@ skipping 48 matching lines @@
       }
     }
     Expect.fail("Connection succeeded with no required client certificate");
   }
   var serverEnd = await server.first;
   var clientEnd = await clientEndFuture;
 
   X509Certificate clientCertificate = serverEnd.peerCertificate;
   if (sendCert) {
     Expect.isNotNull(clientCertificate);
-    Expect.equals("/CN=user1", clientCertificate.subject);
-    Expect.equals("/CN=clientauthority", clientCertificate.issuer);
+    Expect.isTrue(clientCertificate.subject.contains("user1"));
+    Expect.isTrue(clientCertificate.issuer.contains("clientauthority"));
   } else {
     Expect.isNull(clientCertificate);
   }
   X509Certificate serverCertificate = clientEnd.peerCertificate;
   Expect.isNotNull(serverCertificate);
-  Expect.equals("/CN=localhost", serverCertificate.subject);
-  Expect.equals("/CN=intermediateauthority", serverCertificate.issuer);
+  Expect.isTrue(serverCertificate.subject.contains("localhost"));
+  Expect.isTrue(serverCertificate.issuer.contains("intermediateauthority"));
   clientEnd.close();
   serverEnd.close();
 }
 
 main() async {
   asyncStart();
   HOST = (await InternetAddress.lookup("localhost")).first;
   await testClientCertificate(
       required: false, sendCert: true, certType: 'pem', password: 'dartdart');
   await testClientCertificate(
       required: true, sendCert: true, certType: 'pem', password: 'dartdart');
   await testClientCertificate(
       required: false, sendCert: false, certType: 'pem', password: 'dartdart');
   await testClientCertificate(
       required: true, sendCert: false, certType: 'pem', password: 'dartdart');
 
   await testClientCertificate(
       required: false, sendCert: true, certType: 'p12', password: 'dartdart');
   await testClientCertificate(
       required: true, sendCert: true, certType: 'p12', password: 'dartdart');
   await testClientCertificate(
       required: false, sendCert: false, certType: 'p12', password: 'dartdart');
   await testClientCertificate(
       required: true, sendCert: false, certType: 'p12', password: 'dartdart');
   asyncEnd();
 }