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Sign PDF in the Cloud using AWS CloudHSM

See more Signing in the Cloud Examples

Demonstrates how to sign a PDF using AWS CloudHSM. The signing of the hash happens on a hardware token in AWS CloudHSM. Everything else involving the updating the PDF to add the signature happens locally within Chilkat.

Note: This example requires Chilkat v9.5.0.96 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.

; Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

$oPkcs11 = ObjCreate("Chilkat.Pkcs11")

; Provide the path to the AWS CloudHSM PKCS11 driver.
; This example runs on Windows, so we'll provide the CloudHSM DLL.
; If your code runs on Linux, the CloudHSM driver might be at /opt/cloudhsm/lib/libcloudhsm_pkcs11.so
$oPkcs11.SharedLibPath = "C:\Program Files\Amazon\CloudHSM\lib\cloudhsm_pkcs11.dll"

; Your PIN should be a string containing your crypto user's login and password, with a colon char delimiting.
; See https://docs.aws.amazon.com/cloudhsm/latest/userguide/pkcs11-pin.html
Local $sPin = "user:password"
Local $iUserType = 1

; Establish a PKCS logged-on session using the driver (.so, .dylib, or .dll) as specified in the SharedLibPath above.
$bSuccess = $oPkcs11.QuickSession($iUserType,$sPin)
If ($bSuccess = False) Then
    ConsoleWrite($oPkcs11.LastErrorText & @CRLF)
    Exit
EndIf

$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadFromFile("qa_data/certs/myCert.cer")
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

; Tell the certificate to link with the PKCS11 session.
; The cert's private key should be installed on the CloudHSM.
; If there are multiple private keys on the CloudHSM, then Chilkat will automatically
; locate and use the private key corresponding to the certificate.
$bSuccess = $oCert.LinkPkcs11($oPkcs11)
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

; --------------------------------------------------------------------------
; At this point, we have the cert to be used for signing.
; Our PDF signing code is the same as for a cert obtained from any other source..

$oPdf = ObjCreate("Chilkat.Pdf")

; Load a PDF to be signed.
$bSuccess = $oPdf.LoadFile("qa_data/pdf/hello.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    $bSuccess = $oPkcs11.CloseSession()
    Exit
EndIf

$oJson = ObjCreate("Chilkat.JsonObject")

$oJson.UpdateInt("page",1)
$oJson.UpdateString("appearance.y","top")
$oJson.UpdateString("appearance.x","left")
$oJson.UpdateString("appearance.fontScale","10.0")
$oJson.UpdateString("signingAlgorithm","pss")
$oJson.UpdateString("hashAlgorithm","sha256")

Local $i = 0
$oJson.I = $i
$oJson.UpdateString("appearance.text[i]","Digitaly signed by: Xyz Widgets, Inc.")
$i = $i + 1
$oJson.I = $i
$oJson.UpdateString("appearance.text[i]","current_dt")
$i = $i + 1
$oJson.I = $i
$oJson.UpdateString("appearance.text[i]","blah blah blah")

; The certificate is internally linked to the Pkcs11 object, which is currently in an authenticated session.
$bSuccess = $oPdf.SetSigningCert($oCert)

$bSuccess = $oPdf.SignPdf($oJson,"qa_output/out.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    $bSuccess = $oPkcs11.CloseSession()
    Exit
EndIf

; --------------------------------------------------------------------------

; Revert to an unauthenticated session by calling Logout.
$bSuccess = $oPkcs11.Logout()
If ($bSuccess = False) Then
    ConsoleWrite($oPkcs11.LastErrorText & @CRLF)
    $bSuccess = $oPkcs11.CloseSession()
    Exit
EndIf

; When finished, close the session.
; It is important to close the session (memory leaks will occur if the session is not properly closed).
$bSuccess = $oPkcs11.CloseSession()
If ($bSuccess = False) Then
    ConsoleWrite($oPkcs11.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Success." & @CRLF)