c# des方式加密解密完整代码,  创建class 类 ，讲下面代码粘贴进去就可以直接 使用

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

namespace DecryptCode
{
    public class Decrypt
    {
        private static readonly string DESIV = "itemperor";
        /// <summary>
        /// Des加密
        /// </summary>
        /// <param name="originalValue"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string DESEncrypt(string originalValue, string key)
        {
            string result;
            try
            {
                key += "51jrft";
                key = key.Substring(0, 8);
                ICryptoTransform transform = new DESCryptoServiceProvider
                {
                    Key = Encoding.UTF8.GetBytes(key),
                    IV = Encoding.UTF8.GetBytes(HisDecrypt.DESIV)
                }.CreateEncryptor();
                byte[] bytes = Encoding.UTF8.GetBytes(originalValue);
                MemoryStream memoryStream = new MemoryStream();
                CryptoStream cryptoStream = new CryptoStream(memoryStream, transform, CryptoStreamMode.Write);
                cryptoStream.Write(bytes, 0, bytes.Length);
                cryptoStream.FlushFinalBlock();
                cryptoStream.Close();
                result = Convert.ToBase64String(memoryStream.ToArray());
            }
            catch
            {
                result = originalValue;
            }
            return result;
        }
        /// <summary>
        /// Des解密
        /// </summary>
        /// <param name="originalValue"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string DESDecrypt(string encryptedValue, string key)
        {
            string result;
            try
            {
                key += "51jrft";
                key = key.Substring(0, 8);
                ICryptoTransform transform = new DESCryptoServiceProvider
                {
                    Key = Encoding.UTF8.GetBytes(key),
                    IV = Encoding.UTF8.GetBytes(HisDecrypt.DESIV)
                }.CreateDecryptor();
                byte[] array = Convert.FromBase64String(encryptedValue);
                MemoryStream memoryStream = new MemoryStream();
                CryptoStream cryptoStream = new CryptoStream(memoryStream, transform, CryptoStreamMode.Write);
                cryptoStream.Write(array, 0, array.Length);
                cryptoStream.FlushFinalBlock();
                cryptoStream.Close();
                result = Encoding.UTF8.GetString(memoryStream.ToArray());
            }
            catch
            {
                result = encryptedValue;
            }
            return result;
        }
    }
}
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