C#des encryption

usingSystem;

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;          }      } }

C#des encryption