Unicode C

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

See more Certificates Examples

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.

Unicode C

#include <C_CkBinDataW.h>
#include <C_CkAsnW.h>
#include <C_CkXmlW.h>
#include <C_CkDateTimeW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkBinDataW bdCrl;
    HCkAsnW asn;
    HCkXmlW xml;
    int i;
    int count_i;
    const wchar_t *tagPath;
    int j;
    int count_j;
    int k;
    int count_k;
    const wchar_t *revokedCertSerialHex;
    const wchar_t *dateRevoked;
    HCkDateTimeW dt;

    success = FALSE;

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

    // Load a binary .crl file.
    bdCrl = CkBinDataW_Create();
    success = CkBinDataW_LoadFile(bdCrl,L"qa_data/crl/ca1.crl");
    if (success != TRUE) {
        wprintf(L"Failed to load CRL file.\n");
        CkBinDataW_Dispose(bdCrl);
        return;
    }

    asn = CkAsnW_Create();
    success = CkAsnW_LoadBd(asn,bdCrl);
    if (success != TRUE) {
        wprintf(L"%s\n",CkAsnW_lastErrorText(asn));
        CkBinDataW_Dispose(bdCrl);
        CkAsnW_Dispose(asn);
        return;
    }

    // Convert ASN.1 to XML and load into xml and re-emit for pretty printing..
    xml = CkXmlW_Create();
    CkXmlW_LoadXml(xml,CkAsnW_asnToXml(asn));
    success = CkXmlW_SaveXml(xml,L"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

    dt = CkDateTimeW_Create();

    i = 0;
    count_i = CkXmlW_NumChildrenHavingTag(xml,L"sequence");
    while (i < count_i) {
        CkXmlW_putI(xml,i);

        j = 0;
        count_j = CkXmlW_NumChildrenHavingTag(xml,L"sequence[i]|sequence");
        while (j < count_j) {
            CkXmlW_putJ(xml,j);

            k = 0;
            count_k = CkXmlW_NumChildrenHavingTag(xml,L"sequence[i]|sequence[j]|sequence");
            while (k < count_k) {
                CkXmlW_putK(xml,k);

                // Get the revoked certificate's serial number in uppercase hex.
                revokedCertSerialHex = CkXmlW_getChildContent(xml,L"sequence[i]|sequence[j]|sequence[k]|int");
                wprintf(L"serial number: %s\n",revokedCertSerialHex);

                // Get the date/time revoked.  It will be a string formatted as "YYMMDDhhmmssZ", such as "181023093028Z"
                dateRevoked = CkXmlW_getChildContent(xml,L"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:
                CkDateTimeW_SetFromTimestamp(dt,dateRevoked);
                wprintf(L"date revoked: %s\n",CkDateTimeW_getAsRfc822(dt,FALSE));

                k = k + 1;
            }

            j = j + 1;
        }

        i = i + 1;
    }



    CkBinDataW_Dispose(bdCrl);
    CkAsnW_Dispose(asn);
    CkXmlW_Dispose(xml);
    CkDateTimeW_Dispose(dt);

    }