Lazarus Pascal

Get Certificates within XML Signature

See more XML Digital Signatures Examples

Demonstrates how to get the certificates contained within an XML signature. Lazarus Pascal

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.StringBuilder,
  Chilkat.StringArray,
  Chilkat.Cert,
  Chilkat.XmlDSig;

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

procedure RunDemo;
var
  success: Boolean;
  sbXml: TStringBuilder;
  dsig: TXmlDSig;
  i: Integer;
  saCerts: TStringArray;
  cert: TCert;
  bVerifyReferenceDigests: Boolean;
  bVerified: Boolean;
  j: Integer;

begin
  success := False;

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

  sbXml := TStringBuilder.Create;

  //  Load XML containing one or more signatures.
  success := sbXml.LoadFile('qa_data/xml_dsig_valid_samples/multipleSigners/sp.pdf.XAdES.xml','utf-8');
  if (success = False) then
    begin
      WriteLn('Failed to load the XML file..');
      Exit;
    end;

  dsig := TXmlDSig.Create;

  //  First load the XML containing the signatures to be verified.
  //  Note that this particular Signature already contains the RSA public key that will be used
  //  for verification.
  success := dsig.LoadSignatureSb(sbXml);
  if (success = False) then
    begin
      WriteLn(dsig.LastErrorText);
      Exit;
    end;

  //  For each signature, verify and also get the certificate(s) contained within each Signature.
  i := 0;
  saCerts := TStringArray.Create;
  cert := TCert.Create;

  WriteLn('numSignatures = ' + dsig.NumSignatures);

  while i < dsig.NumSignatures do
    begin
      //  Select the Nth signature by setting the Selector property.
      dsig.Selector := i;

      bVerifyReferenceDigests := True;
      bVerified := dsig.VerifySignature(bVerifyReferenceDigests);
      WriteLn('Signature ' + i + 1 + ' verified = ' + bVerified);

      //  Get the certificates embedded in this signature.
      saCerts.Clear();
      success := dsig.GetCerts(saCerts);
      if (success = True) then
        begin
          j := 0;
          while j < saCerts.Count do
            begin
              success := cert.LoadFromBase64(saCerts.GetString(j));
              if (success = True) then
                begin
                  WriteLn('    ' + cert.SubjectDN);
                end;
              j := j + 1;
            end;

        end;

      i := i + 1;
    end;



  sbXml.Free;
  dsig.Free;
  saCerts.Free;
  cert.Free;

end;

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

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.