using System;

using System.IO;

using System.Text;

using System.Security.Cryptography;

public class Encrypt_Decrypt

{

    private static byte[] salt = Encoding.ASCII.GetBytes("CheckMarkInc");

    private static string HashAlgorithm = "SHA1";

    private static int passworditerations = 2;

    private static byte[] iv = Encoding.ASCII.GetBytes("HR$2pIjHR$2pIj12");

    private static int keysize = 256;

    public static void Main()

    {

        Console.WriteLine("Crittare '{0}' produce: {1}", "bindhu", EncryptText("bindhu","checkmark"));

    }

    public static string EncryptText(String text,String paswrd){

        string result;

        try{

            if(string.IsNullOrEmpty(text)){

                result = "";

            }

            else{

                byte[] byte1 = System.Text.Encoding.UTF8.GetBytes(text);    

                byte[] byte2 = System.Text.Encoding.UTF8.GetBytes(paswrd);

                byte[] inarray = Encrypt_Decrypt.AES_Encrypt(byte1, byte2);

                string s = System.Convert.ToBase64String(inarray);

                result = s;

            }

        }

        catch(System.Exception){

            result = "";

        }

        return null;

    }

    public static byte[] AES_Encrypt(byte[] inputtextbytes, byte[] paswrdbytes){

        byte[] result = null;

        PasswordDeriveBytes pdb = new PasswordDeriveBytes(paswrdbytes, salt);

        byte[] bytes3 = pdb.GetBytes(32);

        Console.WriteLine("ENCODED STRING IS:'{0}'", System.Convert.ToBase64String(bytes3));

        Console.WriteLine ("key\t{0}", BitConverter.ToString (bytes3));

        using (var rijndaelManaged =

                       new RijndaelManaged { Key = paswrdbytes, IV = iv, Mode = CipherMode.CBC })

                using (var memoryStream = new MemoryStream())

                using (var cryptoStream =

                       new CryptoStream(memoryStream,

                           rijndaelManaged.CreateEncryptor(paswrdbytes, iv),

                           CryptoStreamMode.Write))

                {

                    using (var ws = new StreamWriter(cryptoStream))

                    {

                        ws.Write(inputtextbytes);

                        result = memoryStream.ToArray();

                    }

                    Console.WriteLine("RESULT IS: '{0}'", Convert.ToBase64String(result));

                }   

        return result ;

    }

}