Broken Encoding Example

//UNITY SIDE
IEnumerator Foo()
    {
        var N = JSON.Parse("{}");
        N["input1"] = input1.text;
        N["input2"] = input2.text;
        string encrypted = Encrypt(N.ToString(), GenerateEncryptionKey);

        print("ENSEND: \n" + encrypted);
        using (UnityWebRequest www = UnityWebRequest.Post(targetURL, encrypted))
        {
            yield return www.SendWebRequest();

            if (www.isHttpError || www.isNetworkError)
            {
                Debug.LogError(www.error + "\n" + www.downloadHandler.text);
                onFail?.Invoke();
            }
            else
            {
                onSuccess?.Invoke();
                print(www.responseCode + " : " + www.downloadHandler.text);
            }

        }
        yield break;
    }

//FUNCTION SIDE
[FunctionName("UserAuthentication")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");

            string name = req.Query["name"];

            string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
            try
            {
                requestBody = Decrypt(requestBody, "Dracon");
            } catch (Exception e)
            {
//Throwing exception here due to escaped characters
                return new BadRequestObjectResult(e.Message + "\n" + requestBody + "\n" + Regex.Unescape(requestBody));
            }

            JSONNode N = null;
            try
            {
                N = JSON.Parse(requestBody);
                if (N["input1"] != "")
                {
                    name = N["username"];
                    return (ActionResult)new OkObjectResult($"Hello, {name}");
                } else if (name != "")
                {
                    return (ActionResult)new OkObjectResult($"Hello, {name}");
                } else
                {
                    return new BadRequestObjectResult("Invalid object syntax");
                }
            } catch (Exception e)
            {
                return new BadRequestObjectResult("Invalid JSON provided. N = " + (N != null).ToString() + "\n" + requestBody + "\n" + e.Message);
            }
        }