using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        public static void Main(string[] args)
        {
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            using (StreamWriter sw = new StreamWriter("PublicKey.xml"))//产生公匙
            {
                sw.WriteLine(rsa.ToXmlString(false));
            }
            using (StreamWriter sw = new StreamWriter("PrivateKey.xml"))//产生私匙（也包含私匙）
            {
                sw.WriteLine(rsa.ToXmlString(true));
            }

            var re = Encryption("aaa");


            var text = "";
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] palindata = Encoding.Default.GetBytes(text);//将要加密的字符串转换为字节数组
            byte[] encryptdata = md5.ComputeHash(palindata);//将字符串加密后也转换为字符数组
            var resultMd5 = Convert.ToBase64String(encryptdata);//将加密后的字节数组转换为加密字符串






            var bsStr = UnBase64String("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9");
            Console.WriteLine(bsStr);
            var enStr = ToBase64String(bsStr);
            Console.WriteLine(enStr);

            var result = MyHmac.CreateToken("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ", "123");
            Console.WriteLine(result);


            Console.ReadKey();
        }

        //加密
        private static string Encryption(string express)
        {
            CspParameters param = new CspParameters();
            param.KeyContainerName = "oa_erp_dowork";//密匙容器的名称，保持加密解密一致才能解密成功
            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(param))
            {
                byte[] plaindata = Encoding.Default.GetBytes(express);//将要加密的字符串转换为字节数组
                byte[] encryptdata = rsa.Encrypt(plaindata, false);//将加密后的字节数据转换为新的加密字节数组
                return Convert.ToBase64String(encryptdata);//将加密后的字节数组转换为字符串
            }
        }

        //解密
        private static string Decrypt(string ciphertext)
        {
            CspParameters param = new CspParameters();
            param.KeyContainerName = "oa_erp_dowork";
            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(param))
            {
                byte[] encryptdata = Convert.FromBase64String(ciphertext);
                byte[] decryptdata = rsa.Decrypt(encryptdata, false);
                return Encoding.Default.GetString(decryptdata);
            }
        }
        public static string UnBase64String(string value)
        {
            if (value == null || value == "")
            {
                return "";
            }
            byte[] bytes = Convert.FromBase64String(value);
            return Encoding.UTF8.GetString(bytes);
        }

        public static string ToBase64String(string value)
        {
            if (value == null || value == "")
            {
                return "";
            }
            byte[] bytes = Encoding.UTF8.GetBytes(value);
            return Convert.ToBase64String(bytes);
        }
    }


    public class MyHmac
    {
        public static string CreateToken(string message, string secret)
        {
            secret = secret ?? "";
            var encoding = new System.Text.ASCIIEncoding();
            byte[] keyByte = encoding.GetBytes(secret);
            byte[] messageBytes = encoding.GetBytes(message);
            using (var hmacsha256 = new HMACSHA256(keyByte))
            {
                byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
                return Convert.ToBase64String(hashmessage);
            }
        }
    }

}