React Native

Set the Decryption Certificate and Private Key

Demonstrates the Chilkat Email.SetDecryptCert2 method, which explicitly provides a certificate and its corresponding private key as separate objects for decrypting a received encrypted email. Set them before loading the encrypted message. This example loads a .cer certificate and a PEM private key, sets both, then loads an encrypted email.

Background: Sometimes the certificate and its private key are stored separately — a public .cer file plus a PEM (or other format) key file — rather than combined in a PFX. SetDecryptCert2 accepts the two objects individually, which is the natural fit for that arrangement. It is the two-object counterpart to SetDecryptCert, which takes a single certificate that already carries its private key.

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

function chilkatExample() {
  // Demonstrates the SetDecryptCert2 method, which explicitly provides a certificate and its
  // corresponding private key (as separate objects) for decrypting a received encrypted
  // email.  Set them before loading the encrypted email.

  const email = new Email();

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

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

  // Provide the certificate and private key to use for decryption.
  try {
    email.setDecryptCert2(cert, privKey);
  } catch {
    console.log(email.lastErrorText);
    return;
  }

  // Load the encrypted email; Chilkat decrypts it using the certificate and key.
  try {
    email.loadEml('qa_data/eml/encrypted.eml');
  } catch {
    console.log(email.lastErrorText);
    return;
  }

  console.log(`Decrypted = ${email.decrypted}`);

  // Note: Paths such as "qa_data/..." are relative local filesystem paths,
  // relative to the current working directory of the running application.
}