(Java) Extract XML from FatturaPA .p7m

Demonstrates how to verify the signature and extract the XML from a FatturaPA .p7m file.

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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[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkBinData bd = new CkBinData();
    boolean success = bd.LoadFile("qa_data/p7m/IT01879020517_abc.xml.p7m");
    if (success != true) {
        System.out.println("Failed to load the .p7m file");
        return;
        }

    CkCrypt2 crypt = new CkCrypt2();

    // Verify and extrct the payload contained within the .p7m.
    // In this case, the payload is the FatturaPA XML.
    // If successful, the resulting bd will contain only the XML.
    boolean bVerified = crypt.OpaqueVerifyBd(bd);
    if (bVerified != true) {
        System.out.println(crypt.lastErrorText());
        System.out.println("Failed to extract and verify.");
        return;
        }

    // Save the XML to a file.
    bd.WriteFile("qa_output/zIT01879020517_abc.xml");

    // Alternatively, load into an XML object and emit.
    CkXml xml = new CkXml();
    xml.LoadXml(bd.getString("utf-8"));

    System.out.println(xml.getXml());
  }
}