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package ehabshhadat;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

/**
 *
 * @author cslab3
 */
public class Ehabshhadat {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws FileNotFoundException, InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IOException {
        // TODO code application logic here

        FileInputStream fis=new FileInputStream("ehab.txt");
        FileOutputStream fos=new FileOutputStream("we.txt");
        String key=" welcome";
        DESKeySpec des=new DESKeySpec(key.getBytes());
        SecretKeyFactory s= SecretKeyFactory.getInstance("DES");
        SecretKey key1= s.generateSecret(des);



        Cipher c= Cipher.getInstance("DES");
        c.init(Cipher.ENCRYPT_MODE,key1);
        CipherInputStream cin= new CipherInputStream(fis, c);
        while(true)
        {
            int b=cin.read();
            if(b==-1)
                break;
            fos.write(b);
        }
        cin.close();
        fos.close();


        FileInputStream is=new FileInputStream("we.txt");
        FileOutputStream os=new FileOutputStream("ehab1.txt");

        String key2=" welcome";
        DESKeySpec des1=new DESKeySpec(key.getBytes());
        SecretKeyFactory s1= SecretKeyFactory.getInstance("DES");
        SecretKey key3= s.generateSecret(des);




        Cipher c1= Cipher.getInstance("DES");
        c1.init(Cipher.DECRYPT_MODE,key1);
        CipherInputStream cin1= new CipherInputStream(is, c1);
         while(true)
        {
            int b=cin1.read();
            if(b==-1)
                break;
            os.write(b);
        }
        cin1.close();
        os.close();


    }

}