(Java) S/MIME Encrypt using Certificate in Apple Keychain

See more Apple Keychain Examples

Encrypts MIME to creates S/MIME using a certificate found in the Apple Keychain.

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

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[])
  {
    CkCert cert = new CkCert();

    // Load the certificate by the Subject Common Name
    // On MacOS and iOS, Chilkat will search the Keychain(s) for the matching certificate.
    boolean success = cert.LoadByCommonName("My Cert");
    if (success == false) {
        System.out.println(cert.lastErrorText());
        return;
        }

    // Note: The private key is not needed for encryption.
    // Only the certificate is needed.

    // Create a simple MIME message to encrypt.
    CkMime mime = new CkMime();
    mime.AddHeaderField("Subject","test");
    mime.AddHeaderField("SomeHeader","123");
    mime.AddHeaderField("Content-Type","text/plain");
    mime.SetBody("This is the body.");

    System.out.println(mime.getMime());
    System.out.println("----");

    // Here's the MIME to be encrypted:

    // Subject: test
    // SomeHeader: 123
    // Content-Type: text/plain
    // 
    // This is the body.

    // -------------------------------------
    // Encrypt the MIME.
    success = mime.Encrypt(cert);
    if (success == false) {
        System.out.println(mime.lastErrorText());
        return;
        }

    // Show the encrypted MIME (S/MIME)
    System.out.println(mime.getMime());

    // Save the encrypted MIME to a file.
    mime.SaveMime("./encrypted.mime");

    // Here's the S/MIME

    // Subject: test
    // SomeHeader: 123
    // Content-Type: application/x-pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data"
    // Content-Disposition: attachment; filename="smime.p7m"
    // Content-Transfer-Encoding: base64
    // 
    // MIICSwYJKoZIhvcNAQcDoIICPDCCAjgCAQAxggGzMIIBrwIBADCBljCBgTELMAkGA1UEBhMCSVQx
    // EDAOBgNVBAgMB0JlcmdhbW8xGTAXBgNVBAcMEFBvbnRlIFNhbiBQaWV0cm8xFzAVBgNVBAoMDkFj
    // dGFsaXMgUy5wLkEuMSwwKgYDVQQDDCNBY3RhbGlzIENsaWVudCBBdXRoZW50aWNhdGlvbiBDQSBH
    // MwIQPCWvkSv8oQ7xRmEHJ6TzEDANBgkqhkiG9w0BAQEFAASCAQB3VZvHRE5EWxug7Sckpcz1ucDZ
    // YiTKiqmyPt75MhzNRQLtKFx/jWwlemUwnPMzeu6yutCkZ74Bdn7MBsfDqV3bUz43wAu+fRBteGvF
    // mTc00MfY8L7o8dkpj4AqAOCj4hKQzbSE99GvSzyXcPE2Gm5NrOPtKxqfFqbBRTCb4fBZP84LaL+x
    // rnYfrM4qXTppixyN8iFYCd4maEbMu/GA5o+j0BkDDnx42pILDoAGV/ERyx55Y3Nc2Mhm/cITBMNn
    // g7uS9KPrlYizNaqVu09Hi9jg4gdZaRiTjUqg05tSOk/YqIQxTgfscwSPY92/ewpI6e1EHtLt8Q33
    // gWCbERptSntUMHwGCSqGSIb3DQEHATAdBglghkgBZQMEAQIEENm1AxeXlEMx7p6McjHIj5CAUEQj
    // 0GuJ5LnTqiqIjOiwmwNidl1N1TRluxX5vAQvwBuYE6bQK4+i04yn2Av3cucW4kvxgP2Nmni+XgQt
    // aPPKlasaVceEeZ15IYjw77/m3YYn
  }
}