Xbase++

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.

Xbase++

LOCAL nSuccess
LOCAL oCert
LOCAL cExtensionXmlStr
LOCAL oXml
LOCAL oSbDistPoint

nSuccess := 0

oCert := CreateObject("Chilkat.Cert")

nSuccess := oCert:LoadFromFile("qa_data/certs/test_haswdt.cer")
IF (nSuccess != 1)
    ? oCert:LastErrorText
    oCert:destroy()
    RETURN
ENDIF

//  Get the CRL Distribution Points extension, which is at OID 2.5.29.31
cExtensionXmlStr := oCert:GetExtensionAsXml("2.5.29.31")
IF (oCert:LastMethodSuccess == 0)
    ? "Certificate does not have the CDP extension."
    oCert:destroy()
    RETURN
ENDIF

oXml := CreateObject("Chilkat.Xml")
oXml:LoadXml(cExtensionXmlStr)

//  See what we have..
? oXml: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...
oSbDistPoint := CreateObject("Chilkat.StringBuilder")
nSuccess := oXml:GetChildContentSb("sequence|contextSpecific|contextSpecific|contextSpecific", oSbDistPoint)
IF (nSuccess == 1)
    oSbDistPoint:Decode("base64", "utf-8")
    ? "CRL Distribution Point:  " + oSbDistPoint:GetAsString()
ENDIF

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

oCert:destroy()
oXml:destroy()
oSbDistPoint:destroy()