Java

Set the Decryption Certificate for an Email

Demonstrates the Chilkat Email.SetDecryptCert method, which explicitly provides a certificate (with access to its private key) for decrypting a received encrypted email. Set the certificate before loading the encrypted message so Chilkat can decrypt it automatically. This example loads the certificate from a PFX, sets it, and then loads an encrypted email.

Background: Decrypting S/MIME email requires the recipient's private key. On Windows and macOS, Chilkat can find an installed certificate automatically, but when the key lives in a standalone PFX file you provide it explicitly with SetDecryptCert. A PFX (PKCS#12) bundles the certificate and its private key in one password-protected file. If the certificate and key are in separate files, use SetDecryptCert2 instead.

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

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates the SetDecryptCert method, which explicitly provides a certificate (with
        // access to its private key) for decrypting a received encrypted email.  Set the cert
        // before loading the encrypted email so it can be decrypted automatically.

        Email email = new Email();

        // Load a certificate together with its private key from a PFX file.
        Cert cert = new Cert();
        try {
            cert.loadPfxFile("qa_data/certs/decryption.pfx", "pfx_password");

            // Provide the certificate to use for decryption.
            email.setDecryptCert(cert);

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

        System.out.println("ReceivedEncrypted = " + email.getReceivedEncrypted());
        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.
    }
}