Pascal (Lazarus/Delphi)

Create a CAdES-T Signature

See more CAdES Examples

Demonstrates how to create a signature with an external timestamp that certifies the time of signing. This requires an online TSA (Time Stamping Authority) service that is capable of producing RFC 3161 compliant timestamps.

Note: This example requires Chilkat v9.5.0.78 or greater.

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.Cert,
  Chilkat.JsonObject,
  Chilkat.Crypt2;

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

procedure RunDemo;
var
  success: Boolean;
  crypt: TCrypt2;
  cert: TCert;
  pfxPath: string;
  pfxPassword: string;
  attrs: TJsonObject;
  inFile: string;
  outFile: string;

begin
  success := False;

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

  crypt := TCrypt2.Create;

  //  This example will use a certificate + private key from a .pfx/.p12 file.
  //  On Windows systems, it is also possible to use certs on smartcards/usb tokens or certs pre-installed in the Windows registry.
  cert := TCert.Create;

  pfxPath := 'qa_data/pfx/myCertAndKey.p12';
  pfxPassword := 'test123';

  success := cert.LoadPfxFile(pfxPath,pfxPassword);
  if (success <> True) then
    begin
      WriteLn(cert.LastErrorText);
      Exit;
    end;

  success := crypt.SetSigningCert(cert);

  //  Use SHA-256 rather than the default of SHA-1
  crypt.HashAlgorithm := 'sha256';

  //  Create JSON that tells Chilkat what signing attributes to include:
  attrs := TJsonObject.Create;
  attrs.UpdateBool('contentType',True);
  attrs.UpdateBool('signingTime',True);
  attrs.UpdateBool('messageDigest',True);
  attrs.UpdateBool('signingCertificateV2',True);

  //  A CAdES-T signature is one that includes a timestampToken created by an online TSA (time stamping authority).
  //  We must include the TSA's URL, as well as a few options to indicate what is desired.
  //  Except for the TSA URL, the options shown here are typically what you would need.
  attrs.UpdateBool('timestampToken.enabled',True);
  attrs.UpdateString('timestampToken.tsaUrl','https://freetsa.org/tsr');
  attrs.UpdateBool('timestampToken.addNonce',False);
  attrs.UpdateBool('timestampToken.requestTsaCert',True);
  attrs.UpdateString('timestampToken.hashAlg','sha256');

  crypt.SigningAttributes := attrs.Emit();

  inFile := 'qa_data/json/sample.json';
  outFile := 'qa_output/sample_cades_t.p7m';

  //  This creates the CAdES-T signature.  During the signature creation, it
  //  communicates with the TSA to get a timestampToken.
  success := crypt.CreateP7M(inFile,outFile);
  if (success <> True) then
    begin
      WriteLn(crypt.LastErrorText);
      Exit;
    end;

  WriteLn('Success.');


  crypt.Free;
  cert.Free;
  attrs.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.