//加密

  public string DesEncrypt(string strText, string strEncrKey)

  {

   byte[] byKey=null;

   byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};

   try

   {

    byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0,8));

    DESCryptoServiceProvider des = new DESCryptoServiceProvider();

    byte[] inputByteArray =System.Text.Encoding.UTF8.GetBytes(strText);

    MemoryStream ms = new MemoryStream();

    CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write) ;

    cs.Write(inputByteArray, 0, inputByteArray.Length);

    cs.FlushFinalBlock();

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

   }

   catch(System.Exception error)

   {

    MessageBox.Show(error.Message);

    return "error:" +error.Message+"\r";

   }

  }

 

  //解密

  public string DesDecrypt(string strText,string sDecrKey)

  {

   byte[] byKey = null;

   byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};

   byte[] inputByteArray = new Byte[strText.Length];

   try

   {

    byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0,8));

    DESCryptoServiceProvider des = new DESCryptoServiceProvider();

    inputByteArray = Convert.FromBase64String(strText);

    MemoryStream ms = new MemoryStream();

    CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);

    cs.Write(inputByteArray, 0, inputByteArray.Length);

    cs.FlushFinalBlock();

    System.Text.Encoding encoding = new System.Text.UTF8Encoding();

    return encoding.GetString(ms.ToArray());

   }

   catch(System.Exception error)

   {

    MessageBox.Show(error.Message);

    return "error:"+error.Message+"\r";

   }

  }