(MFC) 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.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkStringBuilder.h>
#include <CkXmlDSig.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // 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;
    bool success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/encapsulatedTimestamp_not_yet_added.xml","utf-8");
    if (success == false) {
        strOut.append("Failed to load the XML file.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkXmlDSig dsig;
    success = dsig.LoadSignatureSb(sbXml);
    if (success == false) {
        strOut.append(dsig.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    if (dsig.HasEncapsulatedTimeStamp() == true) {
        strOut.append("This signed XML already has an EncapsulatedTimeStamp");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Specify the timestamping authority URL
    CkJsonObject json;
    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;
    success = dsig.AddEncapsulatedTimeStamp(json,sbOut);
    if (success == false) {
        strOut.append(dsig.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        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;
    success = verifier.LoadSignatureSb(sbOut);
    if (success != true) {
        strOut.append(verifier.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        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);
        bool verified = verifier.VerifySignature(true);
        if (verified != true) {
            strOut.append(verifier.lastErrorText());
            strOut.append("\r\n");
            SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
            return;
        }

        verifyIdx = verifyIdx + 1;
    }

    strOut.append("All signatures were successfully verified.");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }