(Java) SII Chile - FRMA Signature Computation and Add to XML

Compute the FRMA signature of a <DA> element enclosed inside a <CAF> element of the XML to be signed.

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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 assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Also see:  Compute the FRMT Signature and Add to XML

    CkXml xml = new CkXml();

    // Load the unsigned XML that contains the following:

    // <DTE version="1.0">
    //   <Documento ID="F60T33">
    //         <TED version="1.0">
    //             <DD>
    // 		...
    //                 <CAF version="1.0">
    //                     <DA>
    // 			...
    //                     </DA>
    // 			... The FRMA will be added here ...
    //                 </CAF>
    //                 ...
    //             </DD>
    //             ... The FRMT will be added here in another example ...
    //         </TED>
    //   </Documento>
    // </DTE>

    boolean success = xml.LoadXmlFile("qa_data/xml_dsig/sii_cl/test_0.xml");
    if (success == false) {
        System.out.println("Failed to load initial XML file.");
        return;
        }

    // Get a reference to the "DA" element
    CkXml daXml = xml.FindChild("Documento|TED|DD|CAF|DA");
    if (xml.get_LastMethodSuccess() == false) {
        System.out.println("Failed to find DA element");
        return;
        }

    //  We need to get the "flattened" DA XML where:
    //    - No whitespace between elements.
    //    - The 5 pre-defined entities are converted.
    //    - The text is encoded in the ISO-8859-1 character set (Latin-1), 
    CkStringBuilder sbFlattened = new CkStringBuilder();
    daXml.put_EmitCompact(true);
    daXml.put_EmitXmlDecl(false);
    daXml.GetXmlSb(sbFlattened);

    // Compute the SHA-1 message digest of the iso-8859-1 byte representation, 
    // and sign it with our RSA private key, getting the result in base64 format.

    CkPrivateKey privKey = new CkPrivateKey();
    success = privKey.LoadAnyFormatFile("qa_data/rsa/rsaPrivKey_pkcs8.pem","");
    if (success == false) {
        System.out.println(privKey.lastErrorText());
        return;
        }

    CkRsa rsa = new CkRsa();
    rsa.ImportPrivateKeyObj(privKey);

    rsa.put_EncodingMode("base64");
    rsa.put_Charset("iso-8859-1");
    String sig = rsa.signStringENC(sbFlattened.getAsString(),"sha1");

    // Add the FRMA signature element to the XML.
    xml.UpdateChildContent("Documento|TED|DD|CAF|FRMA",sig);
    xml.UpdateAttrAt("Documento|TED|DD|CAF|FRMA",true,"algoritmo","SHA1withRSA");

    // See what we have:
    xml.put_EmitCompact(false);
    xml.put_EmitXmlDecl(true);
    System.out.println(xml.getXml());

    xml.SaveXml("qa_data/xml_dsig/sii_cl/test_1.xml");
  }
}