C#MD5 加密 解密

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

namespace ENPOT.Manufacture.Security.DL.DataLogic
{
    public class CryptUtil
    {
        static string encryptionKey = "12345678";
        static byte[] rgbKey = new byte[0];
        static byte[] rgbIV = new byte[] { 10, 20, 30, 40, 50, 60, 70, 80 };

      //編碼

        public static string Encrypt(string textToEncrypt)
        {
            rgbKey = Encoding.UTF8.GetBytes(encryptionKey.Substring(0, 8));
            DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
            byte[] bytes = Encoding.UTF8.GetBytes(textToEncrypt);
            MemoryStream stream = new MemoryStream();
            CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
            stream2.Write(bytes, 0, bytes.Length);
            stream2.FlushFinalBlock();
            return Convert.ToBase64String(stream.ToArray());
        }

 

       //解碼

        public static string Decrypt(string textToDecrypt)
        {
            byte[] buffer = new byte[textToDecrypt.Length];
            rgbKey = Encoding.UTF8.GetBytes(encryptionKey.Substring(0, 8));
            DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
            buffer = Convert.FromBase64String(textToDecrypt);
            MemoryStream stream = new MemoryStream();
            CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
            stream2.Write(buffer, 0, buffer.Length);
            stream2.FlushFinalBlock();
            return Encoding.UTF8.GetString(stream.ToArray());
        }
    }

}