(Delphi DLL) SII XML Digital Signature

Example for SII XML Digital Signature.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, StringBuilder, XmlDSigGen, Xml, XmlDSig, Cert;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
xmlToSign: HCkXml;
gen: HCkXmlDSigGen;
xml1: HCkXml;
cert: HCkCert;
sbXml: HCkStringBuilder;
verifier: HCkXmlDSig;
numSigs: Integer;
verifyIdx: Integer;
verified: Boolean;

begin
success := True;

// Load the XML to be signed.
xmlToSign := CkXml_Create();
success := CkXml_LoadXmlFile(xmlToSign,'c:/aaworkarea/eduardo/sii_unsigned.xml');
if (success = False) then
  begin
    Memo1.Lines.Add(CkXml__lastErrorText(xmlToSign));
    Exit;
  end;

// The sample XML to be signed looks like this:

// <?xml version="1.0" encoding="ISO-8859-1"?>
// <EnvioDTE xmlns="http://www.sii.cl/SiiDte" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sii.cl/SiiDte EnvioDTE_v10.xsd" version="1.0">
// <SetDTE ID="SetDocF0T33_20240425_170512">
//  <Caratula version="1.0">
//   <RutEmisor>99999999-4</RutEmisor>
//   <RutEnvia>12345678-6</RutEnvia>
//   <RutReceptor>888888000-K</RutReceptor>
//   <FchResol>2014-08-22</FchResol>
//   <NroResol>80</NroResol>
//   <TmstFirmaEnv>2024-04-25T17:05:13</TmstFirmaEnv>
//   <SubTotDTE>
//    <TpoDTE>33</TpoDTE>
//    <NroDTE>1</NroDTE>
//   </SubTotDTE>
//  </Caratula>
// <DTE version="1.0">
// <Documento ID="F555T55">
// ...
// </Documento>
// </EnvioDTE>

gen := CkXmlDSigGen_Create();

CkXmlDSigGen_putSigLocation(gen,'EnvioDTE|SetDTE|DTE');
CkXmlDSigGen_putSigLocationMod(gen,0);
CkXmlDSigGen_putSigNamespacePrefix(gen,'');
CkXmlDSigGen_putSigNamespaceUri(gen,'http://www.w3.org/2000/09/xmldsig#');
CkXmlDSigGen_putSignedInfoCanonAlg(gen,'C14N');
CkXmlDSigGen_putSignedInfoDigestMethod(gen,'sha1');

// -------- Reference 1 --------
xml1 := CkXml_Create();
CkXml_putTag(xml1,'Transforms');
CkXml_UpdateAttrAt(xml1,'Transform',True,'Algorithm','http://www.w3.org/TR/2001/REC-xml-c14n-20010315');

CkXmlDSigGen_AddSameDocRef2(gen,'F511T33','sha1',xml1,'');

// Provide a certificate + private key. (PFX password is test123)
cert := CkCert_Create();
success := CkCert_LoadPfxFile(cert,'qa_data/pfx/cert_test123.pfx','test123');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;
CkXmlDSigGen_SetX509Cert(gen,cert,True);

CkXmlDSigGen_putKeyInfoType(gen,'X509Data+KeyValue');
CkXmlDSigGen_putX509Type(gen,'Certificate');

// Load XML to be signed...
sbXml := CkStringBuilder_Create();
CkXml_GetXmlSb(xmlToSign,sbXml);

CkXmlDSigGen_putBehaviors(gen,'IndentedSignature');

// Sign the XML...
success := CkXmlDSigGen_CreateXmlDSigSb(gen,sbXml);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkXmlDSigGen__lastErrorText(gen));
    Exit;
  end;

// -----------------------------------------------

// Save the signed XML to a file.
success := CkStringBuilder_WriteFile(sbXml,'c:/temp/qa_output/signedXml.xml','utf-8',False);

Memo1.Lines.Add(CkStringBuilder__getAsString(sbXml));

// ----------------------------------------
// Verify the signatures we just produced...
verifier := CkXmlDSig_Create();
success := CkXmlDSig_LoadSignatureSb(verifier,sbXml);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkXmlDSig__lastErrorText(verifier));
    Exit;
  end;

numSigs := CkXmlDSig_getNumSignatures(verifier);
verifyIdx := 0;
while verifyIdx < numSigs do
  begin
    CkXmlDSig_putSelector(verifier,verifyIdx);
    verified := CkXmlDSig_VerifySignature(verifier,True);
    if (verified <> True) then
      begin
        Memo1.Lines.Add(CkXmlDSig__lastErrorText(verifier));
        Exit;
      end;
    verifyIdx := verifyIdx + 1;
  end;

Memo1.Lines.Add('All signatures were successfully verified.');

CkXml_Dispose(xmlToSign);
CkXmlDSigGen_Dispose(gen);
CkXml_Dispose(xml1);
CkCert_Dispose(cert);
CkStringBuilder_Dispose(sbXml);
CkXmlDSig_Dispose(verifier);

end;