/**//// 
    /// DES    /// 
    public class DES_    {        private DES mydes;        public string Key;        public string IV;        /**//// 
        /// 对称加密类的构造函数        /// 
        public DES_(string key)        {            mydes = new DESCryptoServiceProvider();            Key = key;            IV = "728#$$%^TyguyshdsufhsfwofnhKJHJKHIYhfiusf98*(^%$^&&(*&()$##@%%$RHGJJHHJ";        }        /**//// 
        /// 对称加密类的构造函数        /// 
        public DES_(string key, string iv)        {            mydes = new DESCryptoServiceProvider();            Key = key;            IV = iv;        }        /**//// 
        /// 获得密钥        /// 
        /// 
     
      密钥
             private byte[] GetLegalKey()        {            string sTemp = Key;            mydes.GenerateKey();            byte[] bytTemp = mydes.Key;            int KeyLength = bytTemp.Length;            if (sTemp.Length > KeyLength)                sTemp = sTemp.Substring(0, KeyLength);            else if (sTemp.Length < KeyLength)                sTemp = sTemp.PadRight(KeyLength, ' ');            return ASCIIEncoding.ASCII.GetBytes(sTemp);        }        /**//// 
        /// 获得初始向量IV        /// 
        /// 
     
      初试向量IV
             private byte[] GetLegalIV()        {            string sTemp = IV;            mydes.GenerateIV();            byte[] bytTemp = mydes.IV;            int IVLength = bytTemp.Length;            if (sTemp.Length > IVLength)                sTemp = sTemp.Substring(0, IVLength);            else if (sTemp.Length < IVLength)                sTemp = sTemp.PadRight(IVLength, ' ');            return ASCIIEncoding.ASCII.GetBytes(sTemp);        }        /**//// 
        /// 加密方法        /// 
        /// 待加密的串        /// 
     
      经过加密的串
             public string Encrypt(string Source)        {            try            {                byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);                MemoryStream ms = new MemoryStream();                mydes.Key = GetLegalKey();                mydes.IV = GetLegalIV();                ICryptoTransform encrypto = mydes.CreateEncryptor();                CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);                cs.Write(bytIn, 0, bytIn.Length);                cs.FlushFinalBlock();                ms.Close();                byte[] bytOut = ms.ToArray();                return Convert.ToBase64String(bytOut);            }            catch (Exception ex)            {                throw new Exception("在文件加密的时候出现错误！错误提示： " + ex.Message);            }        }        /**//// 
        /// 解密方法        /// 
        /// 待解密的串        /// 
     
      经过解密的串
             public string Decrypt(string Source)        {            try            {                byte[] bytIn = Convert.FromBase64String(Source);                MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);                mydes.Key = GetLegalKey();                mydes.IV = GetLegalIV();                ICryptoTransform encrypto = mydes.CreateDecryptor();                CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);                StreamReader sr = new StreamReader(cs);                return sr.ReadToEnd();            }            catch (Exception ex)            {                throw new Exception("在文件解密的时候出现错误！错误提示： " + ex.Message);            }        }        /**//// 
        /// 加密方法byte[] to byte[]        /// 
        /// 待加密的byte数组        /// 
     
      经过加密的byte数组
             public byte[] Encrypt(byte[] Source)        {            try            {                byte[] bytIn = Source;                MemoryStream ms = new MemoryStream();                mydes.Key = GetLegalKey();                mydes.IV = GetLegalIV();                ICryptoTransform encrypto = mydes.CreateEncryptor();                CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);                cs.Write(bytIn, 0, bytIn.Length);                cs.FlushFinalBlock();                ms.Close();                byte[] bytOut = ms.ToArray();                return bytOut;            }            catch (Exception ex)            {                throw new Exception("在文件加密的时候出现错误！错误提示： " + ex.Message);            }        }        /**//// 
        /// 解密方法byte[] to byte[]        /// 
        /// 待解密的byte数组        /// 
     
      经过解密的byte数组
             public byte[] Decrypt(byte[] Source)        {            try            {                byte[] bytIn = Source;                MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);                mydes.Key = GetLegalKey();                mydes.IV = GetLegalIV();                ICryptoTransform encrypto = mydes.CreateDecryptor();                CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);                StreamReader sr = new StreamReader(cs);                return UTF8Encoding.UTF8.GetBytes(sr.ReadToEnd());            }            catch (Exception ex)            {                throw new Exception("在文件解密的时候出现错误！错误提示： " + ex.Message);            }        }        /**//// 
        /// 加密方法File to File        /// 
        /// 待加密文件的路径        /// 待加密后文件的输出路径        public void Encrypt(string inFileName, string outFileName)        {            try            {                FileStream fin = new FileStream(inFileName, FileMode.Open, FileAccess.Read);                FileStream fout = new FileStream(outFileName, FileMode.OpenOrCreate, FileAccess.Write);                fout.SetLength(0);                mydes.Key = GetLegalKey();                mydes.IV = GetLegalIV();                byte[] bin = new byte[100];                long rdlen = 0;                long totlen = fin.Length;                int len;                ICryptoTransform encrypto = mydes.CreateEncryptor();                CryptoStream cs = new CryptoStream(fout, encrypto, CryptoStreamMode.Write);                while (rdlen < totlen)                {                    len = fin.Read(bin, 0, 100);                    cs.Write(bin, 0, len);                    rdlen = rdlen + len;                }                cs.Close();                fout.Close();                fin.Close();            }            catch (Exception ex)            {                throw new Exception("在文件加密的时候出现错误！错误提示： " + ex.Message);            }        }        /**//// 
        /// 解密方法File to File        /// 
        /// 待解密文件的路径        /// 待解密后文件的输出路径        public void Decrypt(string inFileName, string outFileName)        {            try            {                FileStream fin = new FileStream(inFileName, FileMode.Open, FileAccess.Read);                FileStream fout = new FileStream(outFileName, FileMode.OpenOrCreate, FileAccess.Write);                fout.SetLength(0);                byte[] bin = new byte[100];                long rdlen = 0;                long totlen = fin.Length;                int len;                mydes.Key = GetLegalKey();                mydes.IV = GetLegalIV();                ICryptoTransform encrypto = mydes.CreateDecryptor();                CryptoStream cs = new CryptoStream(fout, encrypto, CryptoStreamMode.Write);                while (rdlen < totlen)                {                    len = fin.Read(bin, 0, 100);                    cs.Write(bin, 0, len);                    rdlen = rdlen + len;                }                cs.Close();                fout.Close();                fin.Close();            }            catch (Exception ex)            {                throw new Exception("在文件解密的时候出现错误！错误提示： " + ex.Message);            }        }    }