Rust

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. Rust

// 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"
//          },
// ...
// ...

let sb = chilkat::StringBuilder::new();
if sb.load_file("my_invoice.json", "utf-8").is_err() {
    println!("Failed to load input file.");
    return;
}

// Convert the contents of sb to the ITIDA canonical form.
// Always pass utf-8 for the 2nd arg.
let _ = sb.encode("itida", "utf-8");

// Examine the canonicalized JSON
println!("{}", sb.get_as_string().unwrap_or_default());

// Compute the SHA256 hash and show the SHA256 in hex format
println!("SHA256 hash: {}", sb.get_hash("sha256", "hex", "utf-8").unwrap_or_default());