Pascal (Lazarus/Delphi)

Verify XAdES with External File Reference

See more XML Digital Signatures Examples

Demonstrates how to validate an XML digital signature that contains a reference to an external file. (This is one way of doing it..) Pascal (Lazarus/Delphi)

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.XmlDSig,
  Chilkat.StringBuilder;

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

procedure RunDemo;
var
  success: Boolean;
  sbXml: TStringBuilder;
  validator: TXmlDSig;
  i: Integer;
  valid: Boolean;

begin
  success := False;

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

  //  Load the XAdES file to be validated..
  sbXml := TStringBuilder.Create;
  success := sbXml.LoadFile('qa_data/xml_dsig_valid_samples/externalFile/test.pdf.XAdES','utf-8');
  if (success = False) then
    begin
      WriteLn('Failed to load XAdES input file.');
      Exit;
    end;

  validator := TXmlDSig.Create;

  //  Specify a set of absolute or relative directory paths to be searched for any external file references.
  //  Directory paths are separated by semicolon chars.
  validator.ExternalRefDirs := 'qa_data/externalFiles;qa_data/xml_dsig_valid_samples/externalFile;c:/someOtherDir';

  success := validator.LoadSignatureSb(sbXml);
  if (success = False) then
    begin
      WriteLn(validator.LastErrorText);
      Exit;
    end;

  //  Validate signatures as usual..
  i := 0;
  while i < validator.NumSignatures do
    begin
      validator.Selector := i;

      valid := validator.VerifySignature(True);
      WriteLn('Signature ' + i + 1 + ' and all reference digests OK = ' + valid);

      i := i + 1;
    end;



  sbXml.Free;
  validator.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.