MD5的加密解密c#代码

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using JeqeeExericse.CMS.Core.Security;

namespace JeqeeExericse.CMS.Core.Models
{
    public class MD5EncryptionManager:IEncryptionManager
    {
        private const string KEY = "Gold926!";
        private readonly byte[] _vector = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

        public string Encode(string encryptString)
        {
            try
            {
                var rgbKey = Encoding.UTF8.GetBytes(KEY.Substring(0, 8));
                var des = new DESCryptoServiceProvider();

                var inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                var ms = new MemoryStream();
                var cs = new CryptoStream(ms, des.CreateEncryptor(rgbKey, _vector), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();

                return Convert.ToBase64String(ms.ToArray());
            }