using System;

using System.Net;

​

public class Program

{

    public static void Main()

    {

        string xDateHeader = "2022-10-17T11:49:00.00-06:00";    //-03:00 when executing from montevideo

        string httpMethod = "GET";

        string contentTypeHeader = null;

        string requestUriAbsolutePath = "/FuelFinder/Locations";

        string hash = "qhb5/1oVrZUr3+3ZC3wvb//e0nU="; //User Hashed password (as in DB)

        System.DateTime xDate = System.Convert.ToDateTime(xDateHeader);

        System.Text.UTF8Encoding utf8Encoding = new System.Text.UTF8Encoding();

​

        System.Collections.Generic.IList<string> signatureComponents =

            new System.Collections.Generic.List<string>();

        signatureComponents.Add(httpMethod.ToUpperInvariant());

        if (contentTypeHeader != null &&

             !contentTypeHeader.ToUpperInvariant().Contains("multipart/form-data".ToUpperInvariant()))

         {

             signatureComponents.Add(contentTypeHeader);

         }

        signatureComponents.Add(requestUriAbsolutePath);

        signatureComponents.Add(xDateHeader);

        string stringToHash = string.Join("\n", signatureComponents);       

        byte[] stringToHashBytes = utf8Encoding.GetBytes(stringToHash);

        System.Security.Cryptography.HMACSHA512 hmacsha512_hashedPassword =

            new System.Security.Cryptography.HMACSHA512(utf8Encoding.GetBytes(hash));

        byte[] computedBytes = hmacsha512_hashedPassword.ComputeHash(stringToHashBytes);

        string computedBase64String = System.Convert.ToBase64String(computedBytes);

​

        Console.WriteLine(WebUtility.UrlEncode(computedBase64String));      

    }

}