(Java) Add a Document Timestamp Signature to an already-signed PDF

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Demonstrates how to add a document timestamp signature to an already-signed PDF.

Note: This example requires Chilkat v9.5.0.99 or greater.

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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.

    CkPdf pdf = new CkPdf();

    // Load the PDF that has already been signed.
    boolean success = pdf.LoadFile("qa_data/pdf/helloWorld_signed.pdf");
    if (success == false) {
        System.out.println(pdf.lastErrorText());
        return;
        }

    CkJsonObject json = new CkJsonObject();

    json.UpdateBool("invisibleSignature",true);
    json.UpdateString("subFilter","/ETSI.RFC3161");

    json.UpdateBool("timestampToken.enabled",true);

    // In this example, we'll use a free TSA server (timestamp.digicert.com), but you may want to use your own timestamp authority server.
    json.UpdateString("timestampToken.tsaUrl","http://timestamp.digicert.com");

    // If the timestamp server requires a username/password, do the following.  Otherwise omit the following few lines of code.
    json.UpdateString("timestampToken.tsaUsername","the_tsa_username");
    json.UpdateString("timestampToken.tsaPassword","the_tsa_password");

    // When requesting the timestamp token, ask the server to include its certificate in the timestamp token response.
    // This allows for the timestamp server's certificate to be included in the LTV validation (i.e. if the timestamp server
    // has an OCSP URL, then Chilkat will also do the OCSP request for the timestamp server's certificate.)
    json.UpdateBool("timestampToken.requestTsaCert",true);

    success = pdf.SignPdf(json,"c:/temp/qa_output/helloWorld_signed_2.pdf");
    if (success == false) {
        System.out.println(pdf.lastErrorText());
        return;
        }

    System.out.println("Successfully added a Document Timestamp Signature to the PDF");
  }
}