C#DES加密

using System;

using  System.Collections.Generic;
using  System.ComponentModel;
using  System.Data;
using  System.Text;
using  System.Windows.Forms;
using  System.Security.Cryptography; //加密部分
using  System.IO;

namespace  WindowsFormsApplication1
{
    public  partial  class  Form1 : Form
    {
        public  Form1()
        {
            InitializeComponent();
        }

        private  static  byte [] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
        private  static  string  keyUse = "12345678" ;
        private  static  string  keyDe = "12345678" ;
        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串
        /// <param name="encryptKey">加密密钥,要求为8位
        /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
        public  static  string  EncryptDES( string  encryptString, string  encryptKey)
        {
            try
            {
                byte [] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
                byte [] rgbIV = Keys;
                byte [] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new  DESCryptoServiceProvider();
                MemoryStream mStream = new  MemoryStream();
                CryptoStream cStream = new  CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return  Convert.ToBase64String(mStream.ToArray());
            }
            catch
            {
                return  encryptString;
            }
        }

        /// <summary>
        /// DES解密字符串
        /// </summary>
        /// <param name="decryptString">待解密的字符串
        /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同
        /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
        public  static  string  DecryptDES( string  decryptString, string  decryptKey)
        {
            try
            {
                byte [] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
                byte [] rgbIV = Keys;
                byte [] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new  DESCryptoServiceProvider();
                MemoryStream mStream = new  MemoryStream();
                CryptoStream cStream = new  CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return  Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return  decryptString;
            }
        }

        private  void  button1_Click( object  sender, EventArgs e)
        {
            string  strOrg = TB_ORG.Text;
            string  tmp = System.Text.Encoding.Default.GetString(Keys); //[].ToString();//BitConverter.ToString(Keys).Replace("-", string.Empty);// Keys.ToString();
            string  strEp = EncryptDES(strOrg, keyUse);
            TB_EP.Text = strEp;
        }

        private  void  button2_Click( object  sender, EventArgs e)
        {
            string  strEp = TB_EP.Text;
            string  tmp = System.Text.Encoding.Default.GetString(Keys); //BitConverter.ToString(Keys).Replace("-", string.Empty);// Keys.ToString();
            string  strDe = DecryptDES(strEp, keyDe);
            TB_DE.Text = strDe;
        }
    }
}