Xbase++

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. Xbase++

LOCAL nSuccess
LOCAL oSb

nSuccess := 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"
//           },
//  ...
//  ...

oSb := CreateObject("Chilkat.StringBuilder")
nSuccess := oSb:LoadFile("my_invoice.json", "utf-8")
IF (nSuccess == 0)
    ? "Failed to load input file."
    oSb:destroy()
    RETURN
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
? oSb:GetAsString()

//  Compute the SHA256 hash and show the SHA256 in hex format
? "SHA256 hash: " + oSb:GetHash("sha256", "hex", "utf-8")

oSb:destroy()