Unicode C

Get Certificate CRL Distribution Points

See more Certificates Examples

Demonstrates how to get a certificate's CRL Distribution Points extension data (assuming it exists). In the vast majority of cases, there will be one CRL Distribution Point.

Note: This example requires Chilkat v9.5.0.76 or greater.

Unicode C

#include <C_CkCertW.h>
#include <C_CkXmlW.h>
#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCertW cert;
    const wchar_t *extensionXmlStr;
    HCkXmlW xml;
    HCkStringBuilderW sbDistPoint;

    success = FALSE;

    cert = CkCertW_Create();

    success = CkCertW_LoadFromFile(cert,L"qa_data/certs/test_haswdt.cer");
    if (success != TRUE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkCertW_Dispose(cert);
        return;
    }

    // Get the CRL Distribution Points extension, which is at OID 2.5.29.31
    extensionXmlStr = CkCertW_getExtensionAsXml(cert,L"2.5.29.31");
    if (CkCertW_getLastMethodSuccess(cert) == FALSE) {
        wprintf(L"Certificate does not have the CDP extension.\n");
        CkCertW_Dispose(cert);
        return;
    }

    xml = CkXmlW_Create();
    CkXmlW_LoadXml(xml,extensionXmlStr);

    // See what we have..
    wprintf(L"%s\n",CkXmlW_getXml(xml));

    // We should get XML like this:

    // <?xml version="1.0" encoding="utf-8" ?>
    // <sequence>
    //     <sequence>
    //         <contextSpecific tag="0" constructed="1">
    //             <contextSpecific tag="0" constructed="1">
    //                 <contextSpecific tag="6" constructed="0">aHR0cDovL2NybC5jb21vZG9jYS5jb20vQ09NT0RPUlNBQ2xpZW50QXV0aGVudGljYXRpb25hbmRTZWN1
    // cmVFbWFpbENBLmNybA==</contextSpecific>
    //             </contextSpecific>
    //         </contextSpecific>
    //     </sequence>
    // </sequence>
    // 

    // Assuming there is one CRL Distribution Point...
    sbDistPoint = CkStringBuilderW_Create();
    success = CkXmlW_GetChildContentSb(xml,L"sequence|contextSpecific|contextSpecific|contextSpecific",sbDistPoint);
    if (success == TRUE) {
        CkStringBuilderW_Decode(sbDistPoint,L"base64",L"utf-8");
        wprintf(L"CRL Distribution Point:  %s\n",CkStringBuilderW_getAsString(sbDistPoint));
    }

    // Sample output:
    // CRL Distribution Point:  http://crl.comodoca.com/COMODORSAClientAuthenticationandSecureEmailCA.crl


    CkCertW_Dispose(cert);
    CkXmlW_Dispose(xml);
    CkStringBuilderW_Dispose(sbDistPoint);

    }