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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.

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Local $bSuccess = False

$oCert = ObjCreate("Chilkat.Cert")

$bSuccess = $oCert.LoadFromFile("qa_data/certs/test_haswdt.cer")
If ($bSuccess <> True) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

; Get the CRL Distribution Points extension, which is at OID 2.5.29.31
Local $sExtensionXmlStr = $oCert.GetExtensionAsXml("2.5.29.31")
If ($oCert.LastMethodSuccess = False) Then
    ConsoleWrite("Certificate does not have the CDP extension." & @CRLF)
    Exit
EndIf

$oXml = ObjCreate("Chilkat.Xml")
$oXml.LoadXml($sExtensionXmlStr)

; See what we have..
ConsoleWrite($oXml.GetXml() & @CRLF)

; 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 = ObjCreate("Chilkat.StringBuilder")
$bSuccess = $oXml.GetChildContentSb("sequence|contextSpecific|contextSpecific|contextSpecific",$oSbDistPoint)
If ($bSuccess = True) Then
    $oSbDistPoint.Decode("base64","utf-8")
    ConsoleWrite("CRL Distribution Point:  " & $oSbDistPoint.GetAsString() & @CRLF)
EndIf

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