Java

Specify a Certificate for Encrypted Email

Demonstrates the Chilkat Email.AddEncryptCert method, which explicitly specifies a certificate to use when sending encrypted email. Call it once per recipient certificate; ClearEncryptCerts clears the list. This example loads a recipient certificate, registers it, and enables encrypted sending.

Background: When encrypting to multiple people, each recipient needs to be able to decrypt with their own private key. S/MIME handles this by encrypting the message's one-time content key separately under each recipient's public certificate and including all of those wrapped keys in the message. AddEncryptCert is how you build that recipient list — one call per certificate — giving explicit control over exactly whose certificates are used rather than relying on automatic lookup.

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Chilkat2 Java

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 AddEncryptCert method, which explicitly specifies a certificate for
        // sending encrypted email.  Call it once per recipient certificate.  Use ClearEncryptCerts
        // to clear the list.

        Email email = new Email();
        email.setSubject("Encrypted email");
        email.setBody("Encrypted to the specified recipient certificate(s).");
        email.setFrom("alice@example.com");
        email.addTo("Bob", "bob@example.com");

        // Load a recipient certificate (public key) and add it to the encryption cert list.
        Cert cert = new Cert();
        try {
            cert.loadFromFile("qa_data/certs/recipient.cer");

            email.addEncryptCert(cert);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Request encrypted sending.
        email.setSendEncrypted(true);

        System.out.println("Added the recipient's encryption certificate.");

        // Note: The path "qa_data/certs/recipient.cer" is a relative local filesystem path,
        // relative to the current working directory of the running application.
    }
}