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Sign PDF with Timestamp from TSA (Timestamp Server Authority)

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This example demonstrates how to a sign a PDF that is both long-term validation (LTV) enabled and includes a validating timestamp from a TSA (Timestamp Server Authority). AutoIt

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)

; Tell Chilkat to create an LTV-enabled (long term validation) signature.
; See PDF Long-Term Validation (LTV) Signature Example for more detailed comments about "ltvOcsp".
$oJson.UpdateBool("ltvOcsp",True)

; Tell Chilkat to request a timestamp from a TSA server and include the timestamp token (1.2.840.113549.1.9.16.2.14)
; in the CMS signature's authentication attributes
$oJson.UpdateBool("timestampToken.enabled",True)

; In this example, we'll use a free TSA server (timestamp.digicert.com), but you may want to use your own timestamp authority server.
$oJson.UpdateString("timestampToken.tsaUrl","http://timestamp.digicert.com")

; If the timestamp server requires a username/password, do the following.  Otherwise omit the following few lines of code.
$oJson.UpdateString("timestampToken.tsaUsername","the_tsa_username")
$oJson.UpdateString("timestampToken.tsaPassword","the_tsa_password")

; When requesting the timestamp token, ask the server to include its certificate in the timestamp token response.
; This allows for the timestamp server's certificate to be included in the LTV validation (i.e. if the timestamp server
; has an OCSP URL, then Chilkat will also do the OCSP request for the timestamp server's certificate.)
$oJson.UpdateBool("timestampToken.requestTsaCert",True)

; Define the appearance of the signature.
$oJson.UpdateInt("page",1)
$oJson.UpdateString("appearance.y","top")
$oJson.UpdateString("appearance.x","left")
$oJson.UpdateString("appearance.fontScale","10.0")
$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 with a TSA timestamp.")

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

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

; If you open the Signature Panel in Adobe Acrobat, it will indicate that the signature is LTV enabled
; and contains an embedded timestamp:
; (image:https://example-code.com/images/ltv_signature_with_timestamp.jpg/endImage)