(MFC) Get Certificates within XML Signature

Demonstrates how to get the certificates contained within an XML signature.

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

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkStringBuilder sbXml;

    // Load XML containing one or more signatures.
    bool success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/multipleSigners/sp.pdf.XAdES.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;

    // First load the XML containing the signatures to be verified.
    // Note that this particular Signature already contains the RSA public key that will be used
    // for verification.
    success = dsig.LoadSignatureSb(sbXml);
    if (success != true) {
        strOut.append(dsig.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // For each signature, verify and also get the certificate(s) contained within each Signature.
    int i = 0;
    CkStringArray saCerts;
    CkCert cert;

    strOut.append("numSignatures = ");
    strOut.appendInt(dsig.get_NumSignatures());
    strOut.append("\r\n");

    while (i < dsig.get_NumSignatures()) {
        // Select the Nth signature by setting the Selector property.
        dsig.put_Selector(i);

        bool bVerifyReferenceDigests = true;
        bool bVerified = dsig.VerifySignature(bVerifyReferenceDigests);
        strOut.append("Signature ");
        strOut.appendInt(i + 1);
        strOut.append(" verified = ");
        strOut.appendInt(bVerified);
        strOut.append("\r\n");

        // Get the certificates embedded in this signature.
        saCerts.Clear();
        success = dsig.GetCerts(saCerts);
        if (success == true) {
            int j = 0;
            while (j < saCerts.get_Count()) {
                success = cert.LoadFromBase64(saCerts.getString(j));
                if (success == true) {
                    strOut.append("    ");
                    strOut.append(cert.subjectDN());
                    strOut.append("\r\n");
                }

                j = j + 1;
            }

        }

        i = i + 1;
    }



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }