Implements secure sockets on Mac OS with SecureTransport API

sdk/lib/io/secure_socket.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.
 
 part of dart.io;
 
 /**
  * A high-level class for communicating securely over a TCP socket, using
  * TLS and SSL. The [SecureSocket] exposes both a [Stream] and an
  * [IOSink] interface, making it ideal for using together with
@@ skipping 952 matching lines @@
     args[0] = _filterPointer;
     args[1] = wasInHandshake;
     var bufs = _secureFilter.buffers;
     for (var i = 0; i < NUM_BUFFERS; ++i) {
       args[2 * i + 2] = bufs[i].start;
       args[2 * i + 3] = bufs[i].end;
     }
 
     return _IOService._dispatch(_SSL_PROCESS_FILTER, args).then((response) {
       if (response.length == 2) {
-        _reportError(new TlsException('${response[1]} error ${response[0]}'),
-                     null);
+        if (wasInHandshake) {
+          // If we're in handshake, throw a handshake error.
+          _reportError(
+              new HandshakeException('${response[1]} error ${response[0]}'),
+              null);
+        } else {
+          // If we're connected, throw a TLS error.
+          _reportError(new TlsException('${response[1]} error ${response[0]}'),
+                       null);
+        }
       }
       int start(int index) => response[2 * index];
       int end(int index) => response[2 * index + 1];
 
       _FilterStatus status = new _FilterStatus();
       // Compute writeEmpty as "write plaintext buffer and write encrypted
       // buffer were empty when we started and are empty now".
       status.writeEmpty = bufs[WRITE_PLAINTEXT].isEmpty &&
           start(WRITE_ENCRYPTED) == end(WRITE_ENCRYPTED);
       // If we were in handshake when this started, _writeEmpty may be false
@@ skipping 241 matching lines @@
 /**
  * An exception that happens in the handshake phase of establishing
  * a secure network connection, when looking up or verifying a
  * certificate.
  */
 class CertificateException extends TlsException {
   const CertificateException([String message = "",
                             OSError osError = null])
      : super._("CertificateException", message, osError);
 }