Delphi ActiveX Requires Chilkat v11.0.0+

SII Chile - FRMT Signature Computation and Add to XML

See more XML Digital Signatures Examples

Compute the FRMT signature and add to the XML. This is the RSA signature of the SHA-1 digest of the "flattened" DD element. Delphi ActiveX

var
success: Integer;
xml: TChilkatXml;
ddXml: IChilkatXml;
sbFlattened: TChilkatStringBuilder;
privKey: TPrivateKey;
rsa: TChilkatRsa;
sig: WideString;

begin
success := 0;

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

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

xml := TChilkatXml.Create(Self);

//  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>
//                      <FRMA algoritmo="SHA1withRSA">...</FRMA>
//                  </CAF>
//                  ...
//              </DD>
//              ... The FRMT will be added here in another example ...
//          </TED>
//    </Documento>
//  </DTE>

success := xml.LoadXmlFile('qa_data/xml_dsig/sii_cl/test_1.xml');
if (success = 0) then
  begin
    Memo1.Lines.Add('Failed to load initial XML file.');
    Exit;
  end;

//  Get a reference to the "DD" element
ddXml := xml.FindChild('Documento|TED|DD');
if (xml.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add('Failed to find DD element');
    Exit;
  end;

//   We need to get the "flattened" DD 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), 
sbFlattened := TChilkatStringBuilder.Create(Self);
ddXml.EmitCompact := 1;
ddXml.EmitXmlDecl := 0;
ddXml.GetXmlSb(sbFlattened.ControlInterface);

//  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.

privKey := TPrivateKey.Create(Self);
success := privKey.LoadAnyFormatFile('qa_data/rsa/rsaPrivKey_pkcs8.pem','');
if (success = 0) then
  begin
    Memo1.Lines.Add(privKey.LastErrorText);
    Exit;
  end;

rsa := TChilkatRsa.Create(Self);
rsa.UsePrivateKey(privKey.ControlInterface);

rsa.EncodingMode := 'base64';
rsa.Charset := 'iso-8859-1';
sig := rsa.SignStringENC(sbFlattened.GetAsString(),'sha1');

//  Add the FRMT signature element to the XML.
xml.UpdateChildContent('Documento|TED|FRMT',sig);
xml.UpdateAttrAt('Documento|TED|FRMT',1,'algoritmo','SHA1withRSA');

//  See what we have:
xml.EmitCompact := 0;
xml.EmitXmlDecl := 1;
Memo1.Lines.Add(xml.GetXml());