Unicode C++

Examine KeyInfo Certificate in XML Signature

See more XML Digital Signatures Examples

This example loads signed XML and gets the signing certificate, assuming the certificate is contained in X509Certificate within the KeyInfo. Unicode C++

#include <CkXmlDSigW.h>
#include <CkStringBuilderW.h>
#include <CkXmlW.h>
#include <CkCertW.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    CkXmlDSigW dsig;
    CkStringBuilderW sbXml;

    success = sbXml.LoadFile(L"c:/aaworkarea/elias/3/face_f09006808443a699d1b.xml",L"utf-8");
    if (success != true) {
        wprintf(L"Failed to load XML file.\n");
        return;
    }

    success = dsig.LoadSignatureSb(sbXml);
    if (success != true) {
        wprintf(L"%s\n",dsig.lastErrorText());
        return;
    }

    // Get the KeyInfo XML.
    CkXmlW *xmlKeyInfo = dsig.GetKeyInfo();
    if (dsig.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",dsig.lastErrorText());
        return;
    }

    wprintf(L"%s\n",xmlKeyInfo->getXml());
    wprintf(L"----\n");

    // Assuming the X509Certificate is in the KeyInfo, it will look like this:

    //   <ds:KeyInfo Id="...">
    //     <ds:KeyValue>
    //     ...  
    //     <ds:X509Data>
    //       <ds:X509Certificate>MIIHAz...</ds:X509Certificate>
    //     </ds:X509Data>
    //   </ds:KeyInfo>
    const wchar_t *certBase64 = xmlKeyInfo->getChildContent(L"*:X509Data|*:X509Certificate");
    if (xmlKeyInfo->get_LastMethodSuccess() != true) {
        wprintf(L"No X509Certificate found in the KeyInfo.\n");
        return;
    }

    // Load a certificate object w/ the base64.
    CkCertW cert;
    success = cert.LoadFromBase64(certBase64);
    if (success != true) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    // Examine the cert..
    wprintf(L"SubjectDN: %s\n",cert.subjectDN());
    wprintf(L"IssuerDN: %s\n",cert.issuerDN());
    wprintf(L"SerialNumber as Decimal: %s\n",cert.serialDecimal());

    delete xmlKeyInfo;
    }