/// 
    /// AES加密    /// 
    public sealed class AESCrypt    {        /// 
        /// 加密        /// 
        ///         /// 
             static public string Encode(string text)        {            byte[] key = new byte[] { 132, 149, 17, 104, 128, 101, 170, 180, 191, 28, 127, 149, 144, 121, 200, 130 };            byte[] iv = new byte[] { 198, 12, 49, 123, 101, 128, 103, 212, 112, 122, 133, 35, 150, 130, 210, 181 };            try            {                RijndaelManaged rijn = new RijndaelManaged();                ICryptoTransform trans = rijn.CreateEncryptor(key, iv);                MemoryStream ms = new MemoryStream();                CryptoStream cs = new CryptoStream(ms, trans, CryptoStreamMode.Write);                StreamWriter sw = new StreamWriter(cs);                try                {                    sw.Write(text);                    sw.Flush();                }                finally                {                    sw.Close();                }                byte[] _text = ms.GetBuffer();                int k = 0;                for (k = _text.Length - 1; k >= 0; k--)                {                    if (_text[k] != 0)                    {                        break;                    }                }                int len = k + 1;                if (len % 2 != 0)                {
    //必须保证取的长度为偶数                    len += 1;                }                return Convert.ToBase64String(ms.GetBuffer(), 0, len);            }            catch            {                return string.Empty;            }        }        /// 
        /// 解密        /// 
        ///         /// 
             static public string Decode(string text)        {            byte[] key = new byte[] { 132, 149, 17, 104, 128, 101, 170, 180, 191, 28, 127, 149, 144, 121, 200, 130 };            byte[] iv = new byte[] { 198, 12, 49, 123, 101, 128, 103, 212, 112, 122, 133, 35, 150, 130, 210, 181 };            try            {                RijndaelManaged rijn = new RijndaelManaged();                ICryptoTransform trans = rijn.CreateDecryptor(key, iv);                byte[] data = Convert.FromBase64String(text);                MemoryStream ms = new MemoryStream(data);                CryptoStream cs = new CryptoStream(ms, trans, CryptoStreamMode.Read);                StreamReader sr = new StreamReader(cs);                string r_data = string.Empty;                try                {                    r_data = sr.ReadToEnd();                }                finally                {                    sr.Close();                }                return r_data;            }            catch (Exception ex)            {                return string.Empty;            }        }    }    /// 
    /// SHA1摘要    /// 
    public sealed class SHA1Crypt    {        /// 
        /// Base64编码        /// 
        ///         /// 
             static public string MakeCode(string text)        {            UTF8Encoding utf8 = new UTF8Encoding();            SHA1CryptoServiceProvider sha1 = new SHA1CryptoServiceProvider();            byte[] cb = utf8.GetBytes(text);            byte[] sb = sha1.ComputeHash(cb);            return Convert.ToBase64String(sb);        }    }    /// 
    /// MD5摘要    /// 
    public sealed class MD5Crypt    {        /// 
        /// 32位编码        /// 
        ///         /// 
             public string MakeCode(string text)        {            byte[] _bytes = MD5.Create().ComputeHash(Encoding.UTF8.GetBytes(text));            StringBuilder _result = new StringBuilder();            for (int i = 0; i < _bytes.Length; i++)            {                string _hex = _bytes[i].ToString("x");                if (_hex.Length == 1)                {                    _result.Append("0");                }                _result.Append(_hex);            }            return _result.ToString();        }    }