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Sign PDF using ARSS (Aruba Remote Signing Service)

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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.

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Local $bSuccess = False

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

$oPdf = ObjCreate("Chilkat.Pdf")

; Load the PDF that will be digitally signed.
$bSuccess = $oPdf.LoadFile("qa_data/pdf/hello.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

; Signing options are specified in a JSON object.
$oJson = ObjCreate("Chilkat.JsonObject")

; 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.
$oJson.UpdateBool("ltvOcsp",True)

; Specify the visual appearance of the signature on the PDF page.
$oJson.UpdateInt("page",1)
$oJson.UpdateString("appearance.y","top")
$oJson.UpdateString("appearance.x","left")
$oJson.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.
$oJson.UpdateString("appearance.text[0]","Digitally signed by: cert_cn")
$oJson.UpdateString("appearance.text[1]","current_dt")
$oJson.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.
$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadFromFile("qa_data/certs/myCert.cer")
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

; 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.
$oJsonArss = ObjCreate("Chilkat.JsonObject")

; Required.  Indicates that the cloud signing provider is ARSS.
$oJsonArss.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.
$oJsonArss.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.
$oJsonArss.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.
$oJsonArss.UpdateString("typeOtpAuth","demoprod")

; ARSS account username.
$oJsonArss.UpdateString("user","YOUR_ARSS_USERNAME")

; ARSS account password.
$oJsonArss.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.
$oJsonArss.UpdateString("endpoint","https://app1.firma-remota.it/ArubaSignerService/webresources/signerservice")

$bSuccess = $oCert.SetCloudSigner($oJsonArss)
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

; Associate the certificate with the PDF object.
; All subsequent signing operations will use this certificate.
$bSuccess = $oPdf.SetSigningCert($oCert)
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

; 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.
$bSuccess = $oPdf.SignPdf($oJson,"qa_output/hello_ltv_signed.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("The PDF has been successfully cryptographically signed with long-term validation." & @CRLF)