(VB.NET) ITIDA Canonicalize JSON and Compute SHA256 Hash

See more Egypt ITIDA Examples

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

For more information, see https://sdk.invoicing.eta.gov.eg/signature-creation/

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

Dim sb As New Chilkat.StringBuilder
Dim success As Boolean = sb.LoadFile("my_invoice.json","utf-8")
If (success = False) Then
    Debug.WriteLine("Failed to load input file.")
    Exit Sub
End If


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

' Examine the canonicalized JSON
Debug.WriteLine(sb.GetAsString())

' Compute the SHA256 hash and show the SHA256 in hex format
Debug.WriteLine("SHA256 hash: " & sb.GetHash("sha256","hex","utf-8"))