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. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

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

    CkAsn asn = new CkAsn();

    // Begin with loading ASN.1 from a binary DER/BER format file.
    success = asn.LoadBinaryFile("/Users/chilkat/testData/p7b/test.p7b");
    if (success != true) {
        System.out.println(asn.lastErrorText());
        return;
        }

    // Convert ASN.1 to XML:
    String strXml = asn.asnToXml();
    if (asn.get_LastMethodSuccess() != true) {
        System.out.println(asn.lastErrorText());
        return;
        }

    // The XML returned by AsnToXml will be compact and not pretty-formatted.
    // Use Chilkat XML to format the XML better:
    CkXml xml = new CkXml();
    success = 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:
    CkAsn asn2 = new CkAsn();
    success = asn2.LoadAsnXml(xml.getXml());
    if (success != true) {
        System.out.println(asn2.lastErrorText());
        return;
        }

    // Load the ASN.1 from an encoded string, such as base64:
    CkAsn asn3 = new CkAsn();
    success = asn3.LoadEncoded(strBase64,"base64");
    if (success != true) {
        System.out.println(asn3.lastErrorText());
        return;
        }
  }
}