#region ========MD5加密========
    public  string  MD5Encryption(string userPassword)
    {
        string MD5EncrypPassword = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(userPassword, "MD5");//202CB962AC59075B964B07152D234B70
        return MD5EncrypPassword;

}
    #endregion
    #region ========SHA1加密========
    public string SHA1Encryption(string userPassword)
    {
        string SHA1EncrypPassword = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(userPassword, "SHA1");

return SHA1EncrypPassword;
    }
    #endregion
    #region ========DES加密========
    public string DESEncryption(string userPassword,byte[] Key,byte[] Iv)
    {
        Byte[] password = Encoding.ASCII.GetBytes(userPassword);
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        MemoryStream ms = new MemoryStream();
        ICryptoTransform iCryrt = des.CreateEncryptor(Key, Iv);
        CryptoStream cs = new CryptoStream(ms, iCryrt, CryptoStreamMode.Write);
        cs.Write(password, 0, userPassword.Length);
        cs.FlushFinalBlock();
        return Convert.ToBase64String(ms.ToArray());
    }
    #endregion
    #region ========TripleDES加密========
    public string TripleEncryption(string userPassword, string  Key)
    {
        byte[] bytes = Encoding.Unicode.GetBytes(userPassword);
        byte[] keys = ASCIIEncoding.ASCII.GetBytes(Key);
        TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
        tripleDES.Key = keys;  //长度必须为16位或则是24位
        tripleDES.Mode = CipherMode.ECB; //设置运算模式
        ICryptoTransform transform= tripleDES.CreateEncryptor();
        return Convert.ToBase64String(transform.TransformFinalBlock (bytes, 0, bytes.Length));
    }

#endregion

static void Main(string[] args)
        {
            string password = "123";
            Byte[] key={12,23,34,45,56,20,35,12};
            Byte[] iv={120,230,110,50,30,11,12,13};
            string  tt = "1234567890123456";
            Encryptions ss = new Encryptions();
            //string dnPword = ss.DESEncryption(password, key, iv);
            string ds = ss.TripleEncryption(password, tt);
        }