Java Requires Chilkat v9.5.0.85+

Sign PDF with Timestamp from TSA (Timestamp Server Authority)

See more PDF Signatures Examples

This example demonstrates how to a sign a PDF that is both long-term validation (LTV) enabled and includes a validating timestamp from a TSA (Timestamp Server Authority). Chilkat2 Java

import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Pdf;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Pdf pdf = new Pdf();

        // Load a PDF to be signed.
        // The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
        try {
            pdf.loadFile("qa_data/pdf/hello.pdf");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Options for signing are specified in JSON.
        JsonObject json = new JsonObject();

        // In most cases, the signingCertificateV2 and signingTime attributes are required.
        json.updateInt("signingCertificateV2", 1);
        json.updateInt("signingTime", 1);

        // Tell Chilkat to create an LTV-enabled (long term validation) signature.
        // See PDF Long-Term Validation (LTV) Signature Example for more detailed comments about "ltvOcsp".
        json.updateBool("ltvOcsp", true);

        // Tell Chilkat to request a timestamp from a TSA server and include the timestamp token (1.2.840.113549.1.9.16.2.14)
        // in the CMS signature's authentication attributes
        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);

        // Define the appearance of the signature.
        json.updateInt("page", 1);
        json.updateString("appearance.y", "top");
        json.updateString("appearance.x", "left");
        json.updateString("appearance.fontScale", "10.0");
        json.updateString("appearance.text[0]", "Digitally signed by: cert_cn");
        json.updateString("appearance.text[1]", "current_dt");
        json.updateString("appearance.text[2]", "This is an LTV-enabled signature with a TSA timestamp.");

        // Load the signing certificate. (Use your own certificate.)
        Cert cert = new Cert();
        try {
            cert.loadPfxFile("qa_data/pfx/myPdfSigningCert.pfx", "pfxPassword");

            // Tell the pdf object to use the certificate for signing.
            pdf.setSigningCert(cert);

            pdf.signPdf(json, "qa_output/hello_ltv_signed_with_timestamp.pdf");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("The PDF has been successfully cryptographically signed with TSA timestamp and long-term validation.");

        // If you open the Signature Panel in Adobe Acrobat, it will indicate that the signature is LTV enabled
        // and contains an embedded timestamp:
        // 
    }
}