Java

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

public class ChilkatExample {

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

        Imap imap = new Imap();

        imap.setSsl(true);
        imap.setPort(993);

        try {
            imap.connect("imap.example.com");

            imap.login("user@example.com", "myPassword");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

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

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

            // Use the cert and key to automatically decrypt subsequently downloaded S/MIME messages.
            imap.setDecryptCert2(cert, privKey);

            imap.disconnect();
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }
    }
}