(MFC) Load .crl, Convert to XML, Get Revoked Serial Numbers and Dates

Load a binary .crl file (Certificate Revocation List), converts to XML, and then gets the revoked certificate serial numbers and revocation dates.

Note: This example requires Chilkat v9.5.0.77 or greater.

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

See Also: Using MFC CString in Chilkat

#include <CkBinData.h>
#include <CkAsn.h>
#include <CkXml.h>
#include <CkDateTime.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 a binary .crl file.
    CkBinData bdCrl;
    bool success = bdCrl.LoadFile("qa_data/crl/ca1.crl");
    if (success != true) {
        strOut.append("Failed to load CRL file.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkAsn asn;
    success = asn.LoadBd(bdCrl);
    if (success != true) {
        strOut.append(asn.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Convert ASN.1 to XML and load into xml and re-emit for pretty printing..
    CkXml xml;
    xml.LoadXml(asn.asnToXml());
    success = xml.SaveXml("qa_output/crl.xml");

    // Use this online tool to generate parsing code from CRL XML: 
    // Generate Parsing Code from XML

    // Here's code to parse the XML.  This code was generated by the above tool,
    // and then we modified it by removing unneeded code and changing some names
    int i;
    int count_i;
    const char *tagPath = 0;
    int j;
    int count_j;
    int k;
    int count_k;

    const char *revokedCertSerialHex = 0;
    const char *dateRevoked = 0;

    CkDateTime dt;

    i = 0;
    count_i = xml.NumChildrenHavingTag("sequence");
    while (i < count_i) {
        xml.put_I(i);

        j = 0;
        count_j = xml.NumChildrenHavingTag("sequence[i]|sequence");
        while (j < count_j) {
            xml.put_J(j);

            k = 0;
            count_k = xml.NumChildrenHavingTag("sequence[i]|sequence[j]|sequence");
            while (k < count_k) {
                xml.put_K(k);

                // Get the revoked certificate's serial number in uppercase hex.
                revokedCertSerialHex = xml.getChildContent("sequence[i]|sequence[j]|sequence[k]|int");
                strOut.append("serial number: ");
                strOut.append(revokedCertSerialHex);
                strOut.append("\r\n");

                // Get the date/time revoked.  It will be a string formatted as "YYMMDDhhmmssZ", such as "181023093028Z"
                dateRevoked = xml.getChildContent("sequence[i]|sequence[j]|sequence[k]|utctime");

                // Starting in Chilkat v9.5.0.77, date/time strings formatted as YYMMDDhhmmssZ can be parsed as follows:
                dt.SetFromTimestamp(dateRevoked);
                strOut.append("date revoked: ");
                strOut.append(dt.getAsRfc822(false));
                strOut.append("\r\n");

                k = k + 1;
            }

            j = j + 1;
        }

        i = i + 1;
    }



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }