Java

Convert ASN.1 to/from Binary DER, XML, and Base64

Demonstrates how to convert ASN.1 from and to any of the following formats: binary DER, Base64, and XML. Chilkat2 Java

import com.chilkatsoft.chilkat2.Asn;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Xml;

public class ChilkatExample {

    public static void main(String[] args) {
        Asn asn = new Asn();

        // Begin with loading ASN.1 from a binary DER/BER format file.
        String strXml;
        try {
            asn.loadBinaryFile("/Users/chilkat/testData/p7b/test.p7b");

            // Convert ASN.1 to XML:
            strXml = asn.asnToXml();
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // The XML returned by AsnToXml will be compact and not pretty-formatted.
        // Use Chilkat XML to format the XML better:
        Xml xml = new Xml();
        xml.loadXml(strXml);
        // Assuming success for this example..
        // This is formatted better for human viewing:
        System.out.println(xml.getXml());

        // Now get the ASN.1 in base64 format.  Any encoding supported
        // by Chilkat can be passed, such as "hex", "uu", "quoted-printable", "base32", "modbase64", etc.
        String strBase64 = asn.getEncodedDer("base64");

        // Load the ASN.1 from XML:
        Asn asn2 = new Asn();
        try {
            asn2.loadAsnXml(xml.getXml());
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Load the ASN.1 from an encoded string, such as base64:
        Asn asn3 = new Asn();
        try {
            asn3.loadEncoded(strBase64, "base64");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }
    }
}