using System;

using System.Collections.Generic;

using System.Configuration;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

using System.Threading.Tasks;

​

public class Program

{

    public static void Main()

    {

        ClsEncryption encrypt_decrypt = new ClsEncryption();

        string password;

        password = Console.ReadLine();

        String pwd = encrypt_decrypt.Decrypt(password, true);

        Console.WriteLine(pwd);

    }

}

​

public class ClsEncryption

{

    public string Encrypt(string toEncrypt, bool useHashing)

    {

        byte[] keyArray;

        byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

        System.Configuration.AppSettingsReader settingsReader = new AppSettingsReader();

        // Get the key from config file

        //string key = (string)settingsReader.GetValue("SecurityKey",

        //                                                 typeof(String));

        string key = "p$%^V12#$@%";

        //System.Windows.Forms.MessageBox.Show(key);

        //If hashing use get hashcode regards to your key

        if (useHashing)

        {

            MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();

            keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));

            //Always release the resources and flush data

            // of the Cryptographic service provide. Best Practice

            hashmd5.Clear();

        }

        else

            keyArray = UTF8Encoding.UTF8.GetBytes(key);

        TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();

        //set the secret key for the tripleDES algorithm

        tdes.Key = keyArray;

        //mode of operation. there are other 4 modes.

        //We choose ECB(Electronic code Book)

        tdes.Mode = CipherMode.ECB;

        //padding mode(if any extra byte added)

        tdes.Padding = PaddingMode.PKCS7;

        ICryptoTransform cTransform = tdes.CreateEncryptor();

        //transform the specified region of bytes array to resultArray

        byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

        //Release resources held by TripleDes Encryptor

        tdes.Clear();

        //Return the encrypted data into unreadable string format

        return Convert.ToBase64String(resultArray, 0, resultArray.Length);

    }

​

    public string Decrypt(string cipherString, bool useHashing)

    {

        byte[] keyArray;

        //get the byte code of the string

        byte[] toEncryptArray = Convert.FromBase64String(cipherString);

        System.Configuration.AppSettingsReader settingsReader = new AppSettingsReader();

        //Get your key from config file to open the lock!

        //string key = (string)settingsReader.GetValue("SecurityKey",

        //                                             typeof(String));

        string key = "p$%^V12#$@%";

        if (useHashing)

        {

            //if hashing was used get the hash code with regards to your key

            MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();

            keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));

            //release any resource held by the MD5CryptoServiceProvider

            hashmd5.Clear();

        }

        else

        {

            //if hashing was not implemented get the byte code of the key

            keyArray = UTF8Encoding.UTF8.GetBytes(key);

        }

​

        TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();

        //set the secret key for the tripleDES algorithm

        tdes.Key = keyArray;

        //mode of operation. there are other 4 modes. 

        //We choose ECB(Electronic code Book)

        tdes.Mode = CipherMode.ECB;

        //padding mode(if any extra byte added)

        tdes.Padding = PaddingMode.PKCS7;

        ICryptoTransform cTransform = tdes.CreateDecryptor();

        byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

        //Release resources held by TripleDes Encryptor                

        tdes.Clear();

        //return the Clear decrypted TEXT

        return UTF8Encoding.UTF8.GetString(resultArray);

    }

}