(Swift 2) Get Certificate Authority Information Access

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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func chilkatTest() {
    let cert = CkoCert()

    var success: Bool = cert.LoadFromFile("qa_data/certs/test_haswdt.cer")
    if success != true {
        print("\(cert.LastErrorText)")
        return
    }

    //  Get the Authority Information Access extension, which is at OID 1.3.6.1.5.5.7.1.1
    var extensionXmlStr: String? = cert.GetExtensionAsXml("1.3.6.1.5.5.7.1.1")
    if cert.LastMethodSuccess == false {
        print("Certificate does not have the AuthInfoAccess extension.")
        return
    }

    let xml = CkoXml()
    xml.LoadXml(extensionXmlStr)

    //  See what we have..
    print("\(xml.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:

    let sbOcsp = CkoStringBuilder()
    success = xml.GetChildContentSb("/C/oid,1.3.6.1.5.5.7.48.1|++", sb: sbOcsp)
    if success == true {
        sbOcsp.Decode("base64", charset: "utf-8")
        print("1.3.6.1.5.5.7.48.1:  \(sbOcsp.GetAsString())")
    }

    let sbIssuer = CkoStringBuilder()
    success = xml.GetChildContentSb("/C/oid,1.3.6.1.5.5.7.48.2|++", sb: sbIssuer)
    if success == true {
        sbIssuer.Decode("base64", charset: "utf-8")
        print("1.3.6.1.5.5.7.48.2:  \(sbIssuer.GetAsString())")
    }

    //  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".

}