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Sign a PDF using SmartCard or HSM (Hardware Security Module)

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This example demonstrates how to a sign a PDF using a smartcard or HSM (hardware security module).

Note: This example requires Chilkat v9.5.0.88 or greater.

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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 a PDF to be signed.
;  The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
$bSuccess = $oPdf.LoadFile("qa_data/pdf/hello.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

;  Options for signing are specified in JSON.
$oJson = ObjCreate("Chilkat.JsonObject")

;  In most cases, the signingCertificateV2 and signingTime attributes are required.
$oJson.UpdateInt("signingCertificateV2",1)
$oJson.UpdateInt("signingTime",1)

;  Put the signature on page 1, top left
$oJson.UpdateInt("page",1)
$oJson.UpdateString("appearance.y","top")
$oJson.UpdateString("appearance.x","left")

;  Use a font scale of 10.0
$oJson.UpdateString("appearance.fontScale","10.0")

;  In this example, the appearance of the digital signature will contain three lines:
;  1) The signing certificate's common name
;  2) The current date/time
;  3) Some arbitrary text.
;  The keyword "cert_cn" is replaced with the Certificate's Subject Common Name.
;  The keyword "current_dt" is replaced with the current date/time.
;  Any number of appearance text lines can be added.
$oJson.UpdateString("appearance.text[0]","Digitally signed by: cert_cn")
$oJson.UpdateString("appearance.text[1]","current_dt")
$oJson.UpdateString("appearance.text[2]","The crazy brown fox jumps over the lazy dog.")

;  Use a certificate on a smartcard or USB token.
$oCert = ObjCreate("Chilkat.Cert")

;  Provide the smartcard PIN.
;  Set the smartcard PIN prior to calling LoadFromSmartcard.
;  If the PIN is not explicitly provided here, the Windows OS should
;  display a dialog for the PIN.
$oCert.SmartCardPin = "123456"

;  Load the certificate on the smartcard currently in the reader (or on the USB token).
;  Pass an empty string to allow Chilkat to automatically choose the CSP (Cryptographi Service Provider).
;  See Load Certificate on Smartcard for information about explicitly selecting a particular CSP.
$bSuccess = $oCert.LoadFromSmartcard("")
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

;  Tell the pdf object to use the certificate for signing.
$bSuccess = $oPdf.SetSigningCert($oCert)
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

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

ConsoleWrite("The PDF has been successfully cryptographically signed using an HSM." & @CRLF)