Xbase++

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.

Xbase++

LOCAL nSuccess
LOCAL oCert
LOCAL cExtensionXmlStr
LOCAL oXml
LOCAL oSbOcsp
LOCAL oSbIssuer

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 Authority Information Access extension, which is at OID 1.3.6.1.5.5.7.1.1
cExtensionXmlStr := oCert:GetExtensionAsXml("1.3.6.1.5.5.7.1.1")
IF (oCert:LastMethodSuccess == 0)
    ? "Certificate does not have the AuthInfoAccess 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>
//          <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 := CreateObject("Chilkat.StringBuilder")
nSuccess := oXml:GetChildContentSb("/C/oid,1.3.6.1.5.5.7.48.1|++", oSbOcsp)
IF (nSuccess == 1)
    oSbOcsp:Decode("base64", "utf-8")
    ? "1.3.6.1.5.5.7.48.1:  " + oSbOcsp:GetAsString()
ENDIF

oSbIssuer := CreateObject("Chilkat.StringBuilder")
nSuccess := oXml:GetChildContentSb("/C/oid,1.3.6.1.5.5.7.48.2|++", oSbIssuer)
IF (nSuccess == 1)
    oSbIssuer:Decode("base64", "utf-8")
    ? "1.3.6.1.5.5.7.48.2:  " + oSbIssuer:GetAsString()
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".

oCert:destroy()
oXml:destroy()
oSbOcsp:destroy()
oSbIssuer:destroy()