import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.*;
 
public class Encryptor
{   
   public static void main(String [] args)
   {   
       FileOutputStream fos = null;
       String secret = "Шифруемый текст.";
       try
       {
           String keyfile = "file.txt";
           String algorithm = "DESede";
 
            KeyGenerator kg = KeyGenerator.getInstance(algorithm);
           SecretKey key = kg.generateKey();
           Cipher cipher = Cipher.getInstance(algorithm);
           cipher.init(Cipher.ENCRYPT_MODE, key);
 
                      ObjectOutputStream oos = new ObjectOutputStream(new CipherOutputStream(new FileOutputStream("files.txt"), cipher));
                       oos.writeObject(secret);
                                  fos = new FileOutputStream(keyfile);
           SecretKeyFactory skf = SecretKeyFactory.getInstance(algorithm);
           DESedeKeySpec keyspec = (DESedeKeySpec) skf.getKeySpec(key, DESedeKeySpec.class);
           fos.write(keyspec.getKey());
           fos.close();
           oos.close();
       }
       catch (Exception e) 
       {
           e.printStackTrace();
       }
   }
}