using System;

using System.Text;

using System.Security.Cryptography;

​

public class Program

{

    public static void Main()

    {

        var encr = Encrypt("+7(987)9879879",true);

        Console.WriteLine(encr);

        Console.WriteLine(Decrypt(encr,true));

    }

​

    public static string Encrypt(string toEncrypt, bool useHashing)

{

    byte[] keyArray;

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

​

    // Get the key from config file

​

    string key = "aa1e730dd0ac4161a72cda4763f0919b";

    //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 static string Decrypt(string cipherString, bool useHashing)

{

    byte[] keyArray;

    //get the byte code of the string

​

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

​

    string key = "aa1e730dd0ac4161a72cda4763f0919b";

    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);

}

}