Upgrade a Plain TCP Connection to TLS

See more Socket/SSL/TLS Examples

Demonstrates Socket.ConvertToSsl, which upgrades an already-connected plain TCP socket to TLS by performing a client-side TLS handshake over the existing connection.

import 'package:chilkat/chilkat.dart';

void main() {
  final socket = CkSocket();

  // Connect as plain TCP (no TLS yet).
  final bTls = false;
  final maxWaitMs = 5000;
  try {
    socket.connect('example.com', 5000, bTls, maxWaitMs);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // At the point where the application protocol permits a STARTTLS-style upgrade, perform any required
  // negotiation, then upgrade the existing connection to TLS with a client-side handshake.
  try {
    socket.convertToSsl();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Connection upgraded to TLS.');
}