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ITIDA Canonicalize JSON and Compute SHA256 Hash

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Demonstrates creating the canonical (ITIDA) version of a JSON document, and then computes the SHA256 hash of the canonicalized JSON. AutoIt

Local $bSuccess = False

; This example assumes the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.

; Load the JSON containing the document to be signed.

; The JSON file should look like this:
; NOTE: The JSON should NOT begin with "{ "documents" : [ ..."

;       {
;          "issuer":{
;             "address":{
;                "branchID":"0",
;                "country":"EG",
;                "regionCity":"Cairo",
;                "postalCode":"",
;                "buildingNumber":"0",
;                "street":"123rd Street",
;                "governate":"GOVERNATE"
;             },
;             "type":"B",
;             "id":"209999899",
;             "name":"Xyz SAE"
;          },
; ...
; ...

$oSb = ObjCreate("Chilkat.StringBuilder")
$bSuccess = $oSb.LoadFile("my_invoice.json","utf-8")
If ($bSuccess = False) Then
    ConsoleWrite("Failed to load input file." & @CRLF)
    Exit
EndIf

; Convert the contents of sb to the ITIDA canonical form.
; Always pass utf-8 for the 2nd arg.
$oSb.Encode("itida","utf-8")

; Examine the canonicalized JSON
ConsoleWrite($oSb.GetAsString() & @CRLF)

; Compute the SHA256 hash and show the SHA256 in hex format
ConsoleWrite("SHA256 hash: " & $oSb.GetHash("sha256","hex","utf-8") & @CRLF)