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PDF Signature with Background Image (Seal/Stamp/etc.)

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Demonstrates how to sign a PDF with an appearance that includes a background image, such as a seal, stamp, etc.

Note: This example requires Chilkat v9.5.0.85 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.")

; Load a JPG image to be shown with 30% opacity in the background.
; (the image must be in the JPG format)
; The sample university.jpb is available at https://example-code.com/images/university.jpg

$oJpgData = ObjCreate("Chilkat.BinData")
$bSuccess = $oJpgData.LoadFile("qa_data/jpg/university.jpg")
If ($bSuccess = False) Then
    ConsoleWrite("Failed to load the JPG image." & @CRLF)
    Exit
EndIf

$bSuccess = $oPdf.SetSignatureJpeg($oJpgData)
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

; Specify that we want to display the JPG image in the center with 30% opacity.
$oJson.UpdateString("appearance.image","custom-jpg")
$oJson.UpdateString("appearance.imagePlacement","center")
$oJson.UpdateString("appearance.imageOpacity","30")

; Load the signing certificate. (Use your own certificate.)
$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","secret")
If ($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.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

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

; The appearance of the signature appears in Adobe Acrobat as shown below.
; The JPG is automatically scaled to the size of the signature based on the signature's font scale
; and number of text lines.
; (image:https://example-code.com/images/signature2.jpg/endImage)