(Visual FoxPro) ITIDA Canonicalize JSON and Compute SHA256 Hash
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/
LOCAL loSb
LOCAL lnSuccess
* 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"
* },
* ...
* ...
loSb = CreateObject('Chilkat_9_5_0.StringBuilder')
lnSuccess = loSb.LoadFile("my_invoice.json","utf-8")
IF (lnSuccess = 0) THEN
? "Failed to load input file."
RELEASE loSb
CANCEL
ENDIF
* Convert the contents of sb to the ITIDA canonical form.
* Always pass utf-8 for the 2nd arg.
loSb.Encode("itida","utf-8")
* Examine the canonicalized JSON
? loSb.GetAsString()
* Compute the SHA256 hash and show the SHA256 in hex format
? "SHA256 hash: " + loSb.GetHash("sha256","hex","utf-8")
RELEASE loSb
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