(Unicode C) 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.

For more information, see https://sdk.invoicing.eta.gov.eg/signature-creation/

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#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    HCkStringBuilderW sb;
    BOOL success;

    // 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 = CkStringBuilderW_Create();
    success = CkStringBuilderW_LoadFile(sb,L"my_invoice.json",L"utf-8");
    if (success == FALSE) {
        wprintf(L"Failed to load input file.\n");
        CkStringBuilderW_Dispose(sb);
        return;
    }

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

    // Examine the canonicalized JSON
    wprintf(L"%s\n",CkStringBuilderW_getAsString(sb));

    // Compute the SHA256 hash and show the SHA256 in hex format
    wprintf(L"SHA256 hash: %s\n",CkStringBuilderW_getHash(sb,L"sha256",L"hex",L"utf-8"));


    CkStringBuilderW_Dispose(sb);

    }