React Native

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.

Chilkat React Native Downloads

Download Chilkat for React Native

React Native

import { Cert, Imap, PrivateKey } from '@chilkat/react-native'

async function chilkatExample() {
  // 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.

  const imap = new Imap();

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

  try {
    await imap.connectAsync('imap.example.com');
  } catch {
    console.log(imap.lastErrorText);
    return;
  }

  try {
    await imap.loginAsync('user@example.com', 'myPassword');
  } catch {
    console.log(imap.lastErrorText);
    return;
  }

  // Load the certificate and its private key from separate files.
  const cert = new Cert();
  try {
    cert.loadFromFile('qa_data/smime.cer');
  } catch {
    console.log(cert.lastErrorText);
    return;
  }

  const privKey = new PrivateKey();
  try {
    privKey.loadPemFile('qa_data/smime_privkey.pem');
  } catch {
    console.log(privKey.lastErrorText);
    return;
  }

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

  try {
    await imap.disconnectAsync();
  } catch {
    console.log(imap.lastErrorText);
    return;
  }
}