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

    CkEmail email = new CkEmail();
    email.put_Subject("Encrypted email");
    email.put_Body("Encrypted to the specified recipient certificate(s).");
    email.put_From("alice@example.com");
    email.AddTo("Bob","bob@example.com");

    //  Load a recipient certificate (public key) and add it to the encryption cert list.
    CkCert cert = new CkCert();
    success = cert.LoadFromFile("qa_data/certs/recipient.cer");
    if (success == false) {
        System.out.println(cert.lastErrorText());
        return;
        }

    success = email.AddEncryptCert(cert);
    if (success == false) {
        System.out.println(email.lastErrorText());
        return;
        }

    //  Request encrypted sending.
    email.put_SendEncrypted(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.
  }
}