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Get Certificate Authority Information Access

See more Certificates Examples

Demonstrates how to get a certificate's Authority Information Access extension data (if it exists).

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 Authority Information Access extension, which is at OID 1.3.6.1.5.5.7.1.1
Local $sExtensionXmlStr = $oCert.GetExtensionAsXml("1.3.6.1.5.5.7.1.1")
If ($oCert.LastMethodSuccess = False) Then
    ConsoleWrite("Certificate does not have the AuthInfoAccess 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>
;          <oid>1.3.6.1.5.5.7.48.2</oid>
;          <contextSpecific tag="6" constructed="0">aHR0cDovL2NydC5jb21vZG9jYS5jb20vQ09NT0RPUlNBQ2xpZW50QXV0aGVudGljYXRpb25hbmRTZWN1
;  cmVFbWFpbENBLmNydA==</contextSpecific>
;      </sequence>
;      <sequence>
;          <oid>1.3.6.1.5.5.7.48.1</oid>
;          <contextSpecific tag="6" constructed="0">aHR0cDovL29jc3AuY29tb2RvY2EuY29t</contextSpecific>
;      </sequence>
;  </sequence>

;  Typically, a certificate AIA(Authority Information access) contains 2 parts:
;  
;      On-line Certificate Status Protocol (1.3.6.1.5.5.7.48.1)
;      Certification Authority Issuer (1.3.6.1.5.5.7.48.2)
;  
;  The base64 content for each OID (in this case) is just a string.  
;  The data can be accessed and decoded like this:

$oSbOcsp = ObjCreate("Chilkat.StringBuilder")
$bSuccess = $oXml.GetChildContentSb("/C/oid,1.3.6.1.5.5.7.48.1|++",$oSbOcsp)
If ($bSuccess = True) Then
    $oSbOcsp.Decode("base64","utf-8")
    ConsoleWrite("1.3.6.1.5.5.7.48.1:  " & $oSbOcsp.GetAsString() & @CRLF)
EndIf

$oSbIssuer = ObjCreate("Chilkat.StringBuilder")
$bSuccess = $oXml.GetChildContentSb("/C/oid,1.3.6.1.5.5.7.48.2|++",$oSbIssuer)
If ($bSuccess = True) Then
    $oSbIssuer.Decode("base64","utf-8")
    ConsoleWrite("1.3.6.1.5.5.7.48.2:  " & $oSbIssuer.GetAsString() & @CRLF)
EndIf

;  The output looks like this:

;  1.3.6.1.5.5.7.48.1:  http://ocsp.comodoca.com
;  1.3.6.1.5.5.7.48.2:  http://crt.comodoca.com/COMODORSAClientAuthenticationandSecureEmailCA.crt

;  -------------------------------------------------------------------------------
;  Note: The Chilkat path passed to GetChildContentSb is composed of two commands:
;  The first command is "/C/oid,1.3.6.1.5.5.7.48.1".   It says "traverse the XML tree from the caller
;  node and stop at the 1st node having tag = "oid" and content = "1.3.6.1.5.5.7.48.1".
;  The "|" char separates the 1st command from the 2nd.
;  The 2nd command is "++" and says "move to the next sibling".