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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import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Email;
import com.chilkatsoft.chilkat2.PrivateKey;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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.

        Email email = new Email();

        // Load the certificate (public) and the matching private key from separate files.
        Cert cert = new Cert();
        try {
            cert.loadFromFile("qa_data/certs/recipient.cer");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        PrivateKey privKey = new PrivateKey();
        try {
            privKey.loadPemFile("qa_data/certs/recipient_privkey.pem");

            // Provide the certificate and private key to use for decryption.
            email.setDecryptCert2(cert, privKey);

            // Load the encrypted email; Chilkat decrypts it using the certificate and key.
            email.loadEml("qa_data/eml/encrypted.eml");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

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

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