using System;

using System.Collections.Generic;

using System.Security.Cryptography;

using System.IdentityModel.Tokens.Jwt;

using System.Security.Claims;

using System.Text;

using Microsoft.IdentityModel.Tokens;

using System.Linq;

​

​

public class Program

{

    public static void Main()

    {

        string jwt2 = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0ZXN0Y2xhaW0iOiJ2YWx1ZSIsIm5iZiI6MTU3MTIzNzk4OSwiZXhwIjoxNTcxMzI0Mzg5LCJpYXQiOjE1NzEyMzc5ODl9.Ly89tGhQ5Zgc2RumzvYU3YyPGLtNFrORCQUf5leI04s";

        string jwt = "eyJhbGciOiJIUzI1NiJ9.eyJkZXBsb3ltZW50IjoieW91ci1kZXBsb3ltZW50Iiwib3JpZ2luSG9zdCI6InlvdXJzaXRlLmNvbSIsInB1YmxpY0lkIjoiVUJ0Q0gxcXYiLCJ1c2VyIjp7ImVtYWlsIjoidXNlckB5b3Vyc2l0ZS5jb20iLCJpZCI6IjEyMzQ1In19.mcA1maGgS0jAr0OX3FYl1nIUmKLVgYt6ELYS5m0Ixa8";

        var token = new System.IdentityModel.Tokens.Jwt.JwtSecurityToken(jwt);

        var claims = token.Claims;

        // var c = token.Claims;

        foreach (Claim c in token.Claims)

        {

            Console.WriteLine("RAB: " + c.GetType().ToString() + " -> " + c.ToString());

        }

        //  Now test the round-trip...

        var token2 = GenerateToken(claims);

        Console.WriteLine("RAB: token2 = " + token2);

    }

    private static byte[] StringToByteArray(string hex)

    {

        return Enumerable.Range(0, hex.Length).Where(x => x % 2 == 0).Select(x => Convert.ToByte(hex.Substring(x, 2), 16)).ToArray();

    }

    private static string GenerateToken(IEnumerable<Claim> claims)

    {

        string key = new string("your secret");

        byte[] bytes = Encoding.ASCII.GetBytes(key);

        var symmetricKey = bytes;

        var tokenHandler = new JwtSecurityTokenHandler();

        var now = DateTime.UtcNow;

        var later = now.AddSeconds(1200);

        SigningCredentials creds = new SigningCredentials(new SymmetricSecurityKey(symmetricKey), SecurityAlgorithms.HmacSha256Signature);

        //var tokenDescriptor = new SecurityTokenDescriptor{Subject = new ClaimsIdentity(claims), Expires = later, SigningCredentials = creds};

​

        var header = new JwtHeader();

        var payload = new JwtPayload(claims);

        var tok = new JwtSecurityToken(header, payload);

        return tok.EncodedPayload + "." + tok.EncodedHeader;

        //var tokenDescriptor = new SecurityTokenDescriptor();

        /*

        foreach (Claim c in claims)

        {

            tokenDescriptor.Claims.Add(new System.Collections.Generic.KeyValuePair<string, object>(c.Type, c.Value);

        }

        var stoken = tokenHandler.CreateToken(tokenDescriptor);

        var token = tokenHandler.WriteToken(stoken);

        return token;   

        */  

    }

}

​

​