dart:io | Add SecureSocket.importPrivateCertificates, that reads a PKCS#12 file.

tests/standalone/io/certificate_test_client_database.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.
+//
+// Client that tests that a certificate authority certificate loaded
+// at runtime can be used to verify a certificate chain. The server it
+// connects to uses localhost_cert, signed by myauthority_cert, to connect
+// securely.  This client tests that addCertificate works if a certificate
+// database has been specified.
+
+import 'dart:io';
+
+void main() {
+  int port = int.parse(new Options().arguments[0]);
+  String certificate = new Options().arguments[1];
+  String database = new Options().arguments[2];
+  SecureSocket.initialize(database: database,
+                          password: 'dartdart',
+                          readOnly: false);
+  SecureSocket.removeCertificate('localhost_cert');
+  SecureSocket.removeCertificate('myauthority_cert');
+  var mycert = new File(certificate).readAsBytesSync();
+  SecureSocket.addCertificate(mycert,
+                              SecureSocket.TRUST_ISSUE_SERVER_CERTIFICATES);
+  if (null != SecureSocket.getCertificate('myauthority_cert')) {
+    throw "Expected getCertificate to return null";
+  }
+  SecureSocket.connect('localhost', port).then((SecureSocket socket) {
+    socket.writeln('hello world');
+    socket.listen((data) { });
+    return socket.close();
+  }).then((_) {
+    // The certificate is only in the in-memory cache, so cannot be removed.
+    try {
+      SecureSocket.removeCertificate('myauthority_cert');
+    } catch (e) {
+      if (e is! CertificateException) throw "error $e";
+    }
+  }).then((_) {
+    print('SUCCESS');  // Checked by parent process.
+  });
+}