Dart

Set Cert and Private Key for S/MIME Decryption

Demonstrates the Chilkat Imap.SetDecryptCert2 method, which specifies a certificate together with a separately supplied private key for decrypting S/MIME messages. The first argument is the Cert and the second is the PrivateKey. This example loads the certificate and key from separate files.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: Sometimes the certificate (the public part) and the private key are stored separately — a .cer alongside a PEM key file, for instance. This method pairs them explicitly, whereas SetDecryptCert expects a single Cert that already provides its private key. After the pairing, subsequently downloaded S/MIME messages are decrypted automatically.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Imap.SetDecryptCert2 method, which specifies a certificate together with a
  // separately supplied private key for decrypting S/MIME messages.  The 1st argument is the
  // Cert and the 2nd is the PrivateKey.

  final imap = CkImap();

  imap.ssl = true;
  imap.port = 993;

  try {
    imap.connect('imap.example.com');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    imap.login('user@example.com', 'myPassword');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Load the certificate and its private key from separate files.
  final cert = CkCert();
  try {
    cert.loadFromFile('qa_data/smime.cer');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final privKey = CkPrivateKey();
  try {
    privKey.loadPemFile('qa_data/smime_privkey.pem');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Use the cert and key to automatically decrypt subsequently downloaded S/MIME messages.
  try {
    imap.setDecryptCert2(cert, privKey);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    imap.disconnect();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }
}