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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)