Delphi DLL

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. Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, StringBuilder;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
sb: HCkStringBuilder;

begin
success := 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"
//          },
// ...
// ...

sb := CkStringBuilder_Create();
success := CkStringBuilder_LoadFile(sb,'my_invoice.json','utf-8');
if (success = False) then
  begin
    Memo1.Lines.Add('Failed to load input file.');
    Exit;
  end;

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

// Examine the canonicalized JSON
Memo1.Lines.Add(CkStringBuilder__getAsString(sb));

// Compute the SHA256 hash and show the SHA256 in hex format
Memo1.Lines.Add('SHA256 hash: ' + CkStringBuilder__getHash(sb,'sha256','hex','utf-8'));

CkStringBuilder_Dispose(sb);

end;