Pascal (Lazarus/Delphi)

Sign PDF using ARSS (Aruba Remote Signing Service)

See more Signing in the Cloud Examples

Demonstrates how to digitally sign a PDF using the Aruba Remote Signing Service (ARSS). The example loads a local PDF and certificate, configures the ARSS cloud signer credentials, specifies the OTP authentication type with typeOtpAuth, and creates an LTV-enabled signed PDF where the private key remains protected on the Aruba signing server.

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.Pdf,
  Chilkat.Cert,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  pdf: TPdf;
  json: TJsonObject;
  cert: TCert;
  jsonArss: TJsonObject;

begin
  success := False;

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

  pdf := TPdf.Create;

  //  Load the PDF that will be digitally signed.
  success := pdf.LoadFile('qa_data/pdf/hello.pdf');
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;

  //  Signing options are specified in a JSON object.
  json := TJsonObject.Create;

  //  Enable LTV (Long-Term Validation).
  //  When ltvOcsp is true, OCSP validation information is embedded in the PDF
  //  so that signature validation can continue to succeed in the future,
  //  even if the original OCSP responder is no longer available.
  json.UpdateBool('ltvOcsp',True);

  //  Specify the visual appearance of the signature on the PDF page.
  json.UpdateInt('page',1);
  json.UpdateString('appearance.y','top');
  json.UpdateString('appearance.x','left');
  json.UpdateString('appearance.fontScale','10.0');

  //  Text lines displayed in the visible signature appearance.
  //  Special values such as "cert_cn" and "current_dt" are replaced
  //  with the certificate common name and current date/time.
  json.UpdateString('appearance.text[0]','Digitally signed by: cert_cn');
  json.UpdateString('appearance.text[1]','current_dt');
  json.UpdateString('appearance.text[2]','This is an LTV-enabled signature.');

  //  Load the signing certificate.
  //  
  //  The private key is NOT stored locally.  Instead, the private key is
  //  stored and protected on the Aruba Remote Signing Service (ARSS).
  //  
  //  Even though the signing operation will occur remotely, Chilkat still
  //  needs the corresponding public certificate locally so that it can
  //  construct the CMS/PAdES signature and embed the certificate chain
  //  in the signed PDF.
  cert := TCert.Create;
  success := cert.LoadFromFile('qa_data/certs/myCert.cer');
  if (success = False) then
    begin
      WriteLn(cert.LastErrorText);
      Exit;
    end;

  //  Configure Aruba Remote Signing Service (ARSS) credentials.
  //  
  //  When SetCloudSigner is called, Chilkat is instructed to perform
  //  cryptographic signing operations through the ARSS web service.
  //  The PDF is assembled locally, but the actual RSA signature operation
  //  is performed remotely using the private key held by Aruba.
  jsonArss := TJsonObject.Create;

  //  Required.  Indicates that the cloud signing provider is ARSS.
  jsonArss.UpdateString('service','ARSS');

  //  The ARSS certificate identifier (for example, "AS0").
  //  This identifies which remote certificate/private key pair should be used.
  //  The remote certificate should correspond to the certificate loaded above.
  jsonArss.UpdateString('certID','YOUR_ARSS_CERT_ID');

  //  OTP password associated with the Aruba remote-signing account.
  //  Depending on the ARSS configuration, an OTP may be required to
  //  authorize each signing operation.
  jsonArss.UpdateString('otpPwd','YOUR_OTP_PWD');

  //  Specifies the OTP authentication environment.
  //  
  //  Common values are:
  //    "demoprod" - Demo/Test environment
  //    "prod"     - Production environment
  //  
  //  This value is sent to the ARSS service and determines how the OTP
  //  authentication is validated.  The correct value depends on the type
  //  of Aruba account and environment that has been provisioned.
  //  
  //  If signing fails with an authentication-related error, verify that
  //  the typeOtpAuth value matches the environment associated with the
  //  ARSS account credentials being used.
  jsonArss.UpdateString('typeOtpAuth','demoprod');

  //  ARSS account username.
  jsonArss.UpdateString('user','YOUR_ARSS_USERNAME');

  //  ARSS account password.
  jsonArss.UpdateString('userPWD','YOUR_ARSS_PASSWORD');

  //  Beginning with Chilkat v11.5.0, the ARSS endpoint can be explicitly
  //  specified.  This allows the application to target a particular
  //  Aruba signing service endpoint when required.
  jsonArss.UpdateString('endpoint','https://app1.firma-remota.it/ArubaSignerService/webresources/signerservice');

  success := cert.SetCloudSigner(jsonArss);
  if (success = False) then
    begin
      WriteLn(cert.LastErrorText);
      Exit;
    end;

  //  Associate the certificate with the PDF object.
  //  All subsequent signing operations will use this certificate.
  success := pdf.SetSigningCert(cert);
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;

  //  Create the signed PDF.
  //  
  //  Chilkat performs all PDF processing locally.  When the time comes
  //  to generate the cryptographic signature value, Chilkat sends the
  //  hash to ARSS, which signs it using the remote private key and returns
  //  the signature.  The private key never leaves the Aruba service.
  success := pdf.SignPdf(json,'qa_output/hello_ltv_signed.pdf');
  if (success = False) then
    begin
      WriteLn(pdf.LastErrorText);
      Exit;
    end;

  WriteLn('The PDF has been successfully cryptographically signed with long-term validation.');


  pdf.Free;
  json.Free;
  cert.Free;
  jsonArss.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.