加密：  调用时： Encrypt_DES16(“2AF349243535BCD3”, "1111111111111111");

public static string Encrypt_DES16(string str_in_data, string str_DES_KEY) //数据为十六进制        {            try            {                byte[] shuju = new byte[8];                byte[] keys = new byte[8];                for (int i = 0; i < 8; i++)                {                    shuju[i] = Convert.ToByte(str_in_data.Substring(i * 2, 2), 16);                    keys[i] = Convert.ToByte(str_DES_KEY.Substring(i * 2, 2), 16);                }                DES desEncrypt = new DESCryptoServiceProvider();                desEncrypt.Mode = CipherMode.ECB;                //desEncrypt.Key = ASCIIEncoding.ASCII.GetBytes(str_DES_KEY);                desEncrypt.Key = keys;                byte[] Buffer;                Buffer = shuju;//ASCIIEncoding.ASCII.GetBytes(str_in_data);                ICryptoTransform transForm = desEncrypt.CreateEncryptor();                byte[] R;                R = transForm.TransformFinalBlock(Buffer, 0, Buffer.Length);                string return_str = "";                foreach (byte b in R)                {                    return_str += b.ToString("X2");                }                return_str = return_str.Substring(0, 16);                return return_str;            }            catch (Exception e)            {                throw e;            }        }

解密：调用时： Encrypt_DES16(“C47EC89B0A247A47”, "1111111111111111");

//DES解密        public static string Decrypt_DES16(string str_in_data, string str_DES_KEY)//数据和密钥为十六进制        {            byte[] shuju = new byte[8];            byte[] keys = new byte[8];            for (int i = 0; i < 8; i++)            {                shuju[i] = Convert.ToByte(str_in_data.Substring(i * 2, 2), 16);                keys[i] = Convert.ToByte(str_DES_KEY.Substring(i * 2, 2), 16);            }            DES desDecrypt = new DESCryptoServiceProvider();            desDecrypt.Mode = CipherMode.ECB;            desDecrypt.Key = keys;            desDecrypt.Padding = System.Security.Cryptography.PaddingMode.None;            byte[] Buffer = shuju;            ICryptoTransform transForm = desDecrypt.CreateDecryptor();            byte[] R;            R = transForm.TransformFinalBlock(Buffer, 0, Buffer.Length);            string return_str = "";            foreach (byte b in R)            {                return_str += b.ToString("X2");            }            return return_str;        }