Delphi DLL Requires Chilkat v11.5.0+

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.

Delphi DLL

var
success: Boolean;
pdf: HCkPdf;
json: HCkJsonObject;
cert: HCkCert;
jsonArss: HCkJsonObject;

begin
success := False;

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

pdf := CkPdf_Create();

//  Load the PDF that will be digitally signed.
success := CkPdf_LoadFile(pdf,'qa_data/pdf/hello.pdf');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;

//  Signing options are specified in a JSON object.
json := CkJsonObject_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.
CkJsonObject_UpdateBool(json,'ltvOcsp',True);

//  Specify the visual appearance of the signature on the PDF page.
CkJsonObject_UpdateInt(json,'page',1);
CkJsonObject_UpdateString(json,'appearance.y','top');
CkJsonObject_UpdateString(json,'appearance.x','left');
CkJsonObject_UpdateString(json,'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.
CkJsonObject_UpdateString(json,'appearance.text[0]','Digitally signed by: cert_cn');
CkJsonObject_UpdateString(json,'appearance.text[1]','current_dt');
CkJsonObject_UpdateString(json,'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 := CkCert_Create();
success := CkCert_LoadFromFile(cert,'qa_data/certs/myCert.cer');
if (success = False) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    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 := CkJsonObject_Create();

//  Required.  Indicates that the cloud signing provider is ARSS.
CkJsonObject_UpdateString(jsonArss,'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.
CkJsonObject_UpdateString(jsonArss,'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.
CkJsonObject_UpdateString(jsonArss,'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.
CkJsonObject_UpdateString(jsonArss,'typeOtpAuth','demoprod');

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

//  ARSS account password.
CkJsonObject_UpdateString(jsonArss,'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.
CkJsonObject_UpdateString(jsonArss,'endpoint','https://app1.firma-remota.it/ArubaSignerService/webresources/signerservice');

success := CkCert_SetCloudSigner(cert,jsonArss);
if (success = False) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

//  Associate the certificate with the PDF object.
//  All subsequent signing operations will use this certificate.
success := CkPdf_SetSigningCert(pdf,cert);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    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 := CkPdf_SignPdf(pdf,json,'qa_output/hello_ltv_signed.pdf');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;

Memo1.Lines.Add('The PDF has been successfully cryptographically signed with long-term validation.');

CkPdf_Dispose(pdf);
CkJsonObject_Dispose(json);
CkCert_Dispose(cert);
CkJsonObject_Dispose(jsonArss);