Java

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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Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    //  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.

    CkEmail email = new CkEmail();

    //  Load the certificate (public) and the matching private key from separate files.
    CkCert cert = new CkCert();
    success = cert.LoadFromFile("qa_data/certs/recipient.cer");
    if (success == false) {
        System.out.println(cert.lastErrorText());
        return;
        }

    CkPrivateKey privKey = new CkPrivateKey();
    success = privKey.LoadPemFile("qa_data/certs/recipient_privkey.pem");
    if (success == false) {
        System.out.println(privKey.lastErrorText());
        return;
        }

    //  Provide the certificate and private key to use for decryption.
    success = email.SetDecryptCert2(cert,privKey);
    if (success == false) {
        System.out.println(email.lastErrorText());
        return;
        }

    //  Load the encrypted email; Chilkat decrypts it using the certificate and key.
    success = email.LoadEml("qa_data/eml/encrypted.eml");
    if (success == false) {
        System.out.println(email.lastErrorText());
        return;
        }

    System.out.println("Decrypted = " + email.get_Decrypted());

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