(Java) Get the Certificate with Private Key from a Java KeyStore

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Load a Chilkat certificate object from a Java KeyStore.

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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.

    // Most of the time a .jks contains one certificate with it's associated private key.
    // (Similar to how a .pfx/.p12 usually contains a particular certificate with private key.)
    // This example demonstrates how to get the certificate with private key such that it can be used
    // by other Chilkat classes wherever a cert w/ private key is needed.
    CkJavaKeyStore jks = new CkJavaKeyStore();
    String password = "secret";
    boolean success = jks.LoadFile(password,"qa_data/jks/test_secret.jks");
    if (success != true) {
        System.out.println(jks.lastErrorText());
        return;
        }

    // Make sure we have a private key.
    if (jks.get_NumPrivateKeys() < 1) {
        System.out.println("No private key available.");
        return;
        }

    // -------------------------------------------------------------------------
    // Get the certificate chain associated with the 1st (and probably only) private key in the JKS.
    CkCertChain chain = jks.GetCertChain(0);
    if (jks.get_LastMethodSuccess() != true) {
        System.out.println(jks.lastErrorText());
        return;
        }

    CkCert cert = chain.GetCert(0);
    if (chain.get_LastMethodSuccess() != true) {
        System.out.println(chain.lastErrorText());

        return;
        }

    // Verify again that this cert has a private key.
    if (cert.HasPrivateKey() != true) {
        System.out.println("Certificate has no associated private key.");

        return;
        }

    // We now have the cert object with it's associated private key, and it can be used in other Chilkat classes where needed.
    // For example..

    CkCrypt2 crypt = new CkCrypt2();
    success = crypt.SetSigningCert(cert);
    if (success == false) {
        System.out.println(crypt.lastErrorText());
        return;
        }

    // ...
    // ...
  }
}