(Java) DKIM Signature using Windows Current User Certificate Store

This is a Windows-specific example to load a certificate from the Current User (registry-based) certificate store, and then use the certificate's associated private key for a DKIM signature.

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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[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkCert cert = new CkCert();

    // The LoadByCommonName method searches the Windows Local Machine and Current User 
    // registry-based certificate stores for a certificate having the common name specified. 
    // If found, the certificate is loaded and ready for use.
    boolean success = cert.LoadByCommonName("My Certificate ABC");
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
        }

    // The certificate must have an associated private key installed, and it must be a
    // private key that has been marked "exportable" when it was originally installed.
    if (!cert.HasPrivateKey()) {
        System.out.println("This certificate does not have a private key available.");
        return;
        }

    CkPrivateKey privKey;

    privKey = cert.ExportPrivateKey();
    if (cert.get_LastMethodSuccess() == false) {
        System.out.println(cert.lastErrorText());
        return;
        }

    CkDkim dkim = new CkDkim();

    // Load the private key into the DKIM object:
    success = dkim.LoadDkimPk(privKey.getPkcs8Pem(),"");
    if (success != true) {
        System.out.println(dkim.lastErrorText());
        return;
        }

    // The private key has been loaded into the DKIM object.  See the other DKIM
    // examples for guidance on how to create a DKIM signature...
  }
}