Dart

Use a PEM TLS Client Certificate

Demonstrates the Chilkat MailMan.SetSslClientCertPem method, which sets the client-side certificate for SSL/TLS connections, loading it from PEM data or from a PEM file. The first argument may contain the PEM text itself or a path to a PEM file; the second is the PEM password. This example loads the client certificate from a PEM file.

Background: PEM is the familiar Base64 text format bracketed by -----BEGIN CERTIFICATE----- lines, and a single PEM can hold both a certificate and its (optionally encrypted) private key. It is the common format in Unix/OpenSSL environments, whereas PFX is more typical on Windows. Because this method accepts either the PEM text or a filename, you can supply credentials straight from a config value or secret store without writing them to disk.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  var success = false;

  // Demonstrates the MailMan.SetSslClientCertPem method, which sets the client-side
  // certificate for SSL/TLS connections, loading it from PEM data or from a PEM file.  The
  // 1st argument may contain PEM text or a PEM file path; the 2nd is the PEM password.

  final mailman = CkMailMan();

  // Configure the SMTP server connection.
  mailman.smtpHost = 'smtp.example.com';
  mailman.smtpPort = 465;
  mailman.smtpSsl = true;
  mailman.smtpUsername = 'user@example.com';
  mailman.smtpPassword = 'myPassword';

  // Load the client certificate from a PEM file.
  try {
    mailman.setSslClientCertPem('qa_data/certs/client.pem', 'pem_password');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  success = mailman.verifySmtpLogin();
  if (!success) {
    print(mailman.lastErrorText);
    return;
  }

  print('Connected using a PEM TLS client certificate.');

  // Note: The path "qa_data/certs/client.pem" is a relative local filesystem path,
  // relative to the current working directory of the running application.
}