Go

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.

Go

    success := false

    cert := chilkat.NewCert()

    success = cert.LoadFromFile("qa_data/certs/test_haswdt.cer")
    if success != true {
        fmt.Println(cert.LastErrorText())
        cert.DisposeCert()
        return
    }

    // Get the CRL Distribution Points extension, which is at OID 2.5.29.31
    extensionXmlStr := cert.GetExtensionAsXml("2.5.29.31")
    if cert.LastMethodSuccess() == false {
        fmt.Println("Certificate does not have the CDP extension.")
        cert.DisposeCert()
        return
    }

    xml := chilkat.NewXml()
    xml.LoadXml(*extensionXmlStr)

    // See what we have..
    fmt.Println(*xml.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...
    sbDistPoint := chilkat.NewStringBuilder()
    success = xml.GetChildContentSb("sequence|contextSpecific|contextSpecific|contextSpecific",sbDistPoint)
    if success == true {
        sbDistPoint.Decode("base64","utf-8")
        fmt.Println("CRL Distribution Point:  ", *sbDistPoint.GetAsString())
    }

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

    cert.DisposeCert()
    xml.DisposeXml()
    sbDistPoint.DisposeStringBuilder()