C# JWT加密和解密

一、管理NuGet程序包：

二、新建一个Winform项目：

using JWT;
using JWT.Algorithms;
using JWT.Exceptions;
using JWT.Serializers;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            var payload = new Dictionary<string, object>
            {
                {"UserId",123 },
                {"UserName","admin" }
            };
            var secret = "GQDstc3214345345";

            IJwtAlgorithm algorithm = new HMACSHA256Algorithm();
            IJsonSerializer serializer = new JsonNetSerializer();
            IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
            IJwtEncoder encoder = new JwtEncoder(algorithm,serializer,urlEncoder);

            var token = encoder.Encode(payload,secret);
            //Console.WriteLine(token);
            textBox1.Text = token;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            var token = textBox1.Text;
            var secret = "GQDstc3214345345";
            try
            {
                IJwtAlgorithm algorithm = new HMACSHA256Algorithm();
                IJsonSerializer serializer = new JsonNetSerializer();
                IDateTimeProvider provider = new UtcDateTimeProvider();
                IJwtValidator validator = new JwtValidator(serializer,provider);
                IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
                IJwtDecoder decoder = new JwtDecoder(serializer,validator,urlEncoder, algorithm);

                var json = decoder.Decode(token,secret,verify:true);

                textBox2.Text = json;
                MessageBox.Show("解密成功！");
            }
            catch(TokenExpiredException)
            {
                MessageBox.Show("Token 已经过期！");
            }
            catch(SignatureVerificationException)
            {
                MessageBox.Show("签名校验失败，数据可能被篡改！");
            }
        }
    }
}

运行效果：

备注：增加Token过期时间：

private void button1_Click(object sender, EventArgs e)
        {
            double exp = (DateTime.UtcNow.AddSeconds(10) - new DateTime(1970, 1, 1)).TotalSeconds;//10秒后过期
            var payload = new Dictionary<string, object>
            {
                {"UserId",123 },
                {"UserName","admin" },
                {"exp",exp }
            };
            var secret = "GQDstc3214345345";

            IJwtAlgorithm algorithm = new HMACSHA256Algorithm();
            IJsonSerializer serializer = new JsonNetSerializer();
            IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
            IJwtEncoder encoder = new JwtEncoder(algorithm,serializer,urlEncoder);

            var token = encoder.Encode(payload,secret);
            //Console.WriteLine(token);
            textBox1.Text = token;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            var token = textBox1.Text;
            var secret = "GQDstc3214345345";
            try
            {
                IJwtAlgorithm algorithm = new HMACSHA256Algorithm();
                IJsonSerializer serializer = new JsonNetSerializer();
                IDateTimeProvider provider = new UtcDateTimeProvider();
                IJwtValidator validator = new JwtValidator(serializer,provider);
                IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
                IJwtDecoder decoder = new JwtDecoder(serializer,validator,urlEncoder, algorithm);

                var json = decoder.Decode(token,secret,verify:true);

                textBox2.Text = json;
                MessageBox.Show("解密成功！");
            }
            catch(TokenExpiredException)
            {
                MessageBox.Show("Token 已经过期！");
            }
            catch(SignatureVerificationException)
            {
                MessageBox.Show("签名校验失败，数据可能被篡改！");
            }
        }