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PDF Sign Unsigned Signature Field

See more PDF Signatures Examples

Demonstrates how to sign a PDF's unsigned signature field.

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 containing an unsigned signature field.
$bSuccess = $oPdf.LoadFile("qa_data/pdf/unsigned_sig_field/due_diligence.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

;  A PDF with an unsigned signature field appears in Adobe Acrobat as shown below.
;  (When the mouse pointer is hovered over the field, a tooltip will likely show a message
;  such as "Unsigned signature field (Click to sign)".  
;  This example code will automatically find the unsigned signature field,
;  and signs using your certificate.  It automatically sizes the text to the space alotted
;  for the signature.
;  (image:https://example-code.com/images/unsignedSigField.jpg/endImage)

;  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)

;  We don't specify the page or a specific location because Chilkat will automatically
;  find the unsigned signature field and use its location and size and will scale the
;  signatures visual appearance (text + graphics) to the correct size required to fit.
;  We only need to indicate the desire to fill the unsigned signature field.
$oJson.UpdateBool("appearance.fillUnsignedSignatureField",True)

;  Starting in Chilkat v9.5.0.90, if a PDF contains multiple unsigned signature fields,
;  the field to be signed can be chosen by name:
;  To list unsigned signature fields, see this example: List PDF Unsigned Signature Fields
$oJson.UpdateString("unsignedSignatureField","doctor_signature")

;  Note: If the PDF document contains multiple unsigned signature fields, Chilkat will 
;  sign the 1st one found. 

;  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.")

;  This signature will include one of the built-in SVG graphics (green-check-grey-circle).
$oJson.UpdateString("appearance.image","green-check-grey-circle")
$oJson.UpdateString("appearance.imagePlacement","left")

;  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/due_diligence_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.
;  (image:https://example-code.com/images/signature3.jpg/endImage)