using System;

using System.Security.Cryptography;

using System.Text;

using System.Web;

public class Program {

    public static void Main() {

        //константы

        var bankId = "250216f5-4ca1-4732-80a2-d90d52610d3f";

        var hashSecret = "VekF%6Wwt&C0gtrYNyaG#LKh#Iue31RvYry5If6VL$h!%xZ";

        //данные карты

        var userId = "a02d486f-d04b-43b0-8cf8-3ce7b43e5f49";

        var accountNumber = "12345678901234567890";

        var name = "Иванов Иван Иваныч";

        var stringToHash = hashSecret + bankId + hashSecret + accountNumber + hashSecret + userId + hashSecret + name + hashSecret;

        Console.WriteLine("string to hash: " + stringToHash);

        var hash = Sha256(stringToHash);

        Console.WriteLine("hash: " + hash);

        var postData = "bankId=" + bankId + "&userId=" + userId + "&accountNumber=" + accountNumber + "&name=" + UrlEncode(name) + "&hash=" + hash;

        Console.WriteLine("post data: " + postData);

        /*

        POST https://www.workle.ru/salary-card/set/ HTTP/1.1

        Content-Type: application/x-www-form-urlencoded

        Host: www.workle.ru

        bankId=250216f5-4ca1-4732-80a2-d90d52610d3f&userId=a02d486f-d04b-43b0-8cf8-3ce7b43e5f49&accountNumber=12345678901234567890&name=%d0%98%d0%b2%d0%b0%d0%bd%d0%be%d0%b2+%d0%98%d0%b2%d0%b0%d0%bd+%d0%98%d0%b2%d0%b0%d0%bd%d1%8b%d1%87&hash=3e1a0063d51a000e1200f2c9b1a42d9b15396d23e2b7ad46428ec5590ee5f4b6

        */

    }

    private static string Sha256(string input) {

        using (var hashAlgorithm = SHA256.Create()) {

            var data = hashAlgorithm.ComputeHash(Encoding.UTF8.GetBytes(input));

            var hashBuilder = new StringBuilder();

            for (int i = 0; i < data.Length; i++) {

                hashBuilder.Append(data[i].ToString("x2"));

            }

            return hashBuilder.ToString();

        }

    }

    private static string UrlEncode(string input) {

        return HttpUtility.UrlEncode(input);

    }

}