(Java) Add EncapsulatedTimestamp to Already-Signed XML

See more XML Digital Signatures Examples

Demonstrates how to add an EncapsulatedTimestamp to an existing XML signature.

Note: This example requires Chilkat v9.5.0.90 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.

    // Note: We cannot load the already-signed XML into a Chilkat XML object because it would re-format the XML when re-emitted.
    // (i.e. indentation and whitespace could change, and it would invalidate the existing signature.)
    // We must use a StringBuilder.
    CkStringBuilder sbXml = new CkStringBuilder();
    boolean success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/encapsulatedTimestamp_not_yet_added.xml","utf-8");
    if (success == false) {
        System.out.println("Failed to load the XML file.");
        return;
        }

    CkXmlDSig dsig = new CkXmlDSig();
    success = dsig.LoadSignatureSb(sbXml);
    if (success == false) {
        System.out.println(dsig.lastErrorText());
        return;
        }

    if (dsig.HasEncapsulatedTimeStamp() == true) {
        System.out.println("This signed XML already has an EncapsulatedTimeStamp");
        return;
        }

    // Specify the timestamping authority URL
    CkJsonObject json = new CkJsonObject();
    json.UpdateString("timestampToken.tsaUrl","http://timestamp.digicert.com");
    json.UpdateBool("timestampToken.requestTsaCert",true);

    // Call AddEncapsulatedTimeStamp to add the EncapsulatedTimeStamp to the signature.
    // Note: If the signed XML contains multiple signatures, the signature modified is the one 
    // indicated by the dsig.Selector property.
    CkStringBuilder sbOut = new CkStringBuilder();
    success = dsig.AddEncapsulatedTimeStamp(json,sbOut);
    if (success == false) {
        System.out.println(dsig.lastErrorText());
        return;
        }

    sbOut.WriteFile("qa_output/addedEncapsulatedTimeStamp.xml","utf-8",false);

    // The EncapsulatedTimeStamp can be validated when validating the signature by adding the VerifyEncapsulatedTimeStamp
    // keyword to UncommonOptions.  See here:

    // ----------------------------------------
    // Verify the signatures we just produced...
    CkXmlDSig verifier = new CkXmlDSig();
    success = verifier.LoadSignatureSb(sbOut);
    if (success != true) {
        System.out.println(verifier.lastErrorText());
        return;
        }

    // Add "VerifyEncapsulatedTimeStamp" to the UncommonOptions to also verify any EncapsulatedTimeStamps
    verifier.put_UncommonOptions("VerifyEncapsulatedTimeStamp");

    int numSigs = verifier.get_NumSignatures();
    int verifyIdx = 0;
    while (verifyIdx < numSigs) {
        verifier.put_Selector(verifyIdx);
        boolean verified = verifier.VerifySignature(true);
        if (verified != true) {
            System.out.println(verifier.lastErrorText());
            return;
            }

        verifyIdx = verifyIdx+1;
        }

    System.out.println("All signatures were successfully verified.");
  }
}