DataFlex

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. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoSb
    String sTemp1

    Move False To iSuccess

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

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSb
    If (Not(IsComObjectCreated(hoSb))) Begin
        Send CreateComObject of hoSb
    End
    Get ComLoadFile Of hoSb "my_invoice.json" "utf-8" To iSuccess
    If (iSuccess = False) Begin
        Showln "Failed to load input file."
        Procedure_Return
    End

    // Convert the contents of sb to the ITIDA canonical form.
    // Always pass utf-8 for the 2nd arg.
    Get ComEncode Of hoSb "itida" "utf-8" To iSuccess

    // Examine the canonicalized JSON
    Get ComGetAsString Of hoSb To sTemp1
    Showln sTemp1

    // Compute the SHA256 hash and show the SHA256 in hex format
    Get ComGetHash Of hoSb "sha256" "hex" "utf-8" To sTemp1
    Showln "SHA256 hash: " sTemp1


End_Procedure