JWTS Token encoding using .NET for Jersey

TestJWTS.cs

using System;
using System.Collections.Generic;
using System.IdentityModel.Tokens;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using System.Xml;

namespace TestAuth
{
    class Program
    {
        static void Main(string[] args)
        {
            String applicationKey= "f5GmsZVC48CoOt2p";
            String tokenHeaderName="X-Session-Token";
            long expiredTokenPeriod=4000000;

            String token = "eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJ7XCJkaWdlc3RcIjpcImQzZGE0MjFiZGJjMGU5MmRmNGVkYWI2MjhiMjA1M2ExXCIsXCJ1aWRcIjpcIjAxNTk5MjFcIixcInRva2VuR2VuZXJhdGlvblRpbWVcIjpcIjIwMTY6MDk6Mjk6MTY6NDE6MzFcIn0ifQ.SFQB8l7MpK7ojgarLW8ssvZPvhB9p_zEaZrE5kxCMOY91GoXjEZOMg64NqHj0tRGywXcsc4v9jMcYxL3lN0bDw";

            var handler = new JwtSecurityTokenHandler();
            var output = handler.ReadToken(token);

            string uid = "0159921";
            string time = "2016:09:29:16:41:31";
            string toMD5 = uid + time + applicationKey;
            string digest;
            using (MD5 md5 = MD5.Create())
            {
                digest = GetMd5Hash(md5, toMD5);
            }
            JwtHeader header = new JwtHeader
            {
                {"alg", "HS512"}
            };

            //string digest = "d3da421bdbc0e92df4edab628b2053a1";

            JwtPayload payload = new JwtPayload
            {
                {
                    "sub",
                    "{\"digest\":\""+digest+"\",\"uid\":\""+uid+"\",\"tokenGenerationTime\":\""+time+"\"}"
                }
            };
            var newToken = new JwtSecurityToken(header, payload);
            var newStringToken = handler.WriteToken(newToken);

        }

        static string GetMd5Hash(MD5 md5Hash, string input)
        {
            // Convert the input string to a byte array and compute the hash.
            byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input));

            // Create a new Stringbuilder to collect the bytes
            // and create a string.
            StringBuilder sBuilder = new StringBuilder();

            // Loop through each byte of the hashed data 
            // and format each one as a hexadecimal string.
            for (int i = 0; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }

            // Return the hexadecimal string.
            return sBuilder.ToString();
        }

    }
}