B4X

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. B4X

Dim success As Boolean = 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"
'           },
'  ...
'  ...

Dim sb As ChilkatStringBuilder
sb.Initialize
success = sb.LoadFile("my_invoice.json", "utf-8")
If success = False Then
    Log("Failed to load input file.")
    Return
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
Log(sb.GetAsString)

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