using System;

using System.Text;

using System.Security.Cryptography;

using System.IO;

public class Program

{

    public static string EncryptionKey = "ibvrbank1986";

    private static byte[] ConvertHexStringToBytes(string hexString)

        {

            int numBytes = hexString.Length / 2;

            byte[] arrByte = new byte[numBytes];

            for (int i = 0; i < numBytes; ++i)

                arrByte[i] = byte.Parse(hexString.Substring(i * 2, 2),

                  System.Globalization.NumberStyles.HexNumber);

            return arrByte;

        }

     private static string ConvertBytesToHexString(byte[] data)

        {

            string hexString = "";

            foreach (byte b in data)

                hexString += String.Format("{0:X2}", b);

            return hexString;

        }

    public static string Decrypt(string stringToDecrypt, string sEncryptionKey)

        {

            byte[] key = { };

​

            byte[] IV = { 10, 20, 30, 40, 50, 60, 70, 80 };

            byte[] inputByteArray = new byte[stringToDecrypt.Length];

​

            try

            {

                //key = Encoding.UTF8.GetBytes(sEncryptionKey.Substring(0, 8));

                key = Encoding.GetEncoding("utf-8").GetBytes(sEncryptionKey.Substring(0, 8));

                DESCryptoServiceProvider des = new DESCryptoServiceProvider();

                //inputByteArray = Convert.FromBase64String(stringToDecrypt);

                //inputByteArray = Encoding.UTF8.GetBytes(stringToDecrypt);

                inputByteArray = ConvertHexStringToBytes(stringToDecrypt);

                MemoryStream ms = new MemoryStream();

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

​

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

​

                cs.FlushFinalBlock();

                //Encoding encoding = Encoding.UTF8;

                Encoding encoding = Encoding.GetEncoding("utf-8");

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

​

            }

            catch (System.Exception ex)

            {

                return ex.Message;

​

            }

        }

    public static string Encrypt(string stringToEncrypt, string sEncryptionKey)

        {

            byte[] key = { };

​

            byte[] IV = { 10, 20, 30, 40, 50, 60, 70, 80 };

​

            byte[] inputByteArray;

​

            try

            {

                //key = Encoding.UTF8.GetBytes(sEncryptionKey.Substring(0, 8));

                key = Encoding.GetEncoding("utf-8").GetBytes(sEncryptionKey.Substring(0, 8));

​

                DESCryptoServiceProvider des = new DESCryptoServiceProvider();

                //inputByteArray = Encoding.UTF8.GetBytes(stringToEncrypt);

                inputByteArray = Encoding.GetEncoding("utf-8").GetBytes(stringToEncrypt);

                MemoryStream ms = new MemoryStream();

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

​

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

​

                cs.FlushFinalBlock();

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

                return ConvertBytesToHexString(ms.ToArray());

​

            }

            catch (System.Exception ex)

            {

                return ex.Message;

​

            }

        }//end of Encrypt

    public static void Main()

    {

        Console.WriteLine(string.Format("args1 : {0}",Decrypt("DF876004139425A6FCF48B31059F5CD467053098FA3C2D2910DB6A230B6E0DF1A88DBEBD5717172993A3029843067617", EncryptionKey)));

        Console.WriteLine(string.Format("{0}",Encrypt("accinfo&type=loan&accnumber=103810005668888", EncryptionKey)));

    }

}