Lianja

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.

Lianja

llSuccess = .F.

loCert = createobject("CkCert")

llSuccess = loCert.LoadFromFile("qa_data/certs/test_haswdt.cer")
if (llSuccess <> .T.) then
    ? loCert.LastErrorText
    release loCert
    return
endif

// Get the CRL Distribution Points extension, which is at OID 2.5.29.31
lcExtensionXmlStr = loCert.GetExtensionAsXml("2.5.29.31")
if (loCert.LastMethodSuccess = .F.) then
    ? "Certificate does not have the CDP extension."
    release loCert
    return
endif

loXml = createobject("CkXml")
loXml.LoadXml(lcExtensionXmlStr)

// See what we have..
? loXml.GetXml()

// 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...
loSbDistPoint = createobject("CkStringBuilder")
llSuccess = loXml.GetChildContentSb("sequence|contextSpecific|contextSpecific|contextSpecific",loSbDistPoint)
if (llSuccess = .T.) then
    loSbDistPoint.Decode("base64","utf-8")
    ? "CRL Distribution Point:  " + loSbDistPoint.GetAsString()
endif

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


release loCert
release loXml
release loSbDistPoint