(MFC) Verify XAdES with External File Reference

Demonstrates how to validate an XML digital signature that contains a reference to an external file. (This is one way of doing it..)

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

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Load the XAdES file to be validated..
    CkStringBuilder sbXml;
    bool success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/externalFile/test.pdf.XAdES","utf-8");
    if (success == false) {
        strOut.append("Failed to load XAdES input file.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkXmlDSig validator;

    // Specify a set of absolute or relative directory paths to be searched for any external file references.
    // Directory paths are separated by semicolon chars.
    validator.put_ExternalRefDirs("qa_data/externalFiles;qa_data/xml_dsig_valid_samples/externalFile;c:/someOtherDir");

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

    // Validate signatures as usual..
    int i = 0;
    while (i < validator.get_NumSignatures()) {
        validator.put_Selector(i);

        bool valid = validator.VerifySignature(true);
        strOut.append("Signature ");
        strOut.appendInt(i + 1);
        strOut.append(" and all reference digests OK = ");
        strOut.appendInt(valid);
        strOut.append("\r\n");

        i = i + 1;
    }



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }