Java

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.

Chilkat2 Java

import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.StringBuilder;
import com.chilkatsoft.chilkat2.Xml;

public class ChilkatExample {

    public static void main(String[] args) {
        boolean success = false;

        Cert cert = new Cert();

        try {
            cert.loadFromFile("qa_data/certs/test_haswdt.cer");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Get the Authority Information Access extension, which is at OID 1.3.6.1.5.5.7.1.1
        String extensionXmlStr;
        try {
            extensionXmlStr = cert.getExtensionAsXml("1.3.6.1.5.5.7.1.1");
        } catch (ChilkatException e) {
            System.out.println("Certificate does not have the AuthInfoAccess extension.");
            return;
        }

        Xml xml = new Xml();
        xml.loadXml(extensionXmlStr);

        // See what we have..
        System.out.println(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:

        StringBuilder sbOcsp = new StringBuilder();
        try {
            xml.getChildContentSb("/C/oid,1.3.6.1.5.5.7.48.1|++", sbOcsp);
            success = true;
        } catch (ChilkatException e) {
            success = false;
        }
        if (success) {
            sbOcsp.decode("base64", "utf-8");
            System.out.println("1.3.6.1.5.5.7.48.1:  " + sbOcsp.getAsString());
        }

        StringBuilder sbIssuer = new StringBuilder();
        try {
            xml.getChildContentSb("/C/oid,1.3.6.1.5.5.7.48.2|++", sbIssuer);
            success = true;
        } catch (ChilkatException e) {
            success = false;
        }
        if (success) {
            sbIssuer.decode("base64", "utf-8");
            System.out.println("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".
    }
}