Classic ASP

ITIDA Canonicalize JSON and Compute SHA256 Hash

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

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

' 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"
'          },
' ...
' ...

set sb = Server.CreateObject("Chilkat.StringBuilder")
success = sb.LoadFile("my_invoice.json","utf-8")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to load input file.") & "</pre>"
    Response.End
End If

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

' Examine the canonicalized JSON
Response.Write "<pre>" & Server.HTMLEncode( sb.GetAsString()) & "</pre>"

' Compute the SHA256 hash and show the SHA256 in hex format
Response.Write "<pre>" & Server.HTMLEncode( "SHA256 hash: " & sb.GetHash("sha256","hex","utf-8")) & "</pre>"

%>
</body>
</html>