using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace FileFish
{
    class Program
    {
        public static void Main()
        {
            AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
            aes.GenerateIV();
            Console.WriteLine(Decrypt(Encoding.UTF8.GetBytes("APPLEAPPLEAPPLEAPPLEAPPLEAPPLEAP"), aes.IV, Encrypt(Encoding.UTF8.GetBytes("APPLEAPPLEAPPLEAPPLEAPPLEAPPLEAP"), aes.IV, "cheese")));
            Console.ReadKey(true);
        }

        private static byte[] Encrypt(byte[] key, byte[] iv, string plaintext)
        {
            AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
            aes.Key = key;
            aes.IV = iv;
            ICryptoTransform encryptor = aes.CreateEncryptor();
            MemoryStream ms = new MemoryStream();
            StreamWriter sw = new StreamWriter(new CryptoStream(ms, encryptor, CryptoStreamMode.Write));
            sw.Write(plaintext);
            return ms.ToArray();
        }

        private static string Decrypt(byte[] key, byte[] iv, byte[] ciphertext)
        {
            AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
            aes.Key = key;
            aes.IV = iv;
            ICryptoTransform decryptor = aes.CreateEncryptor();
            MemoryStream ms = new MemoryStream(ciphertext);
            StreamReader sr = new StreamReader(new CryptoStream(ms, decryptor, CryptoStreamMode.Read));
            return sr.ReadToEnd();
        }
    }
}