package twomodul.encrypt;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

/**
 * Created by 1 on 20.12.2014.
 */
public class EncryptUtils {
    public static final String DEFAULT_ENCODING="UTF-8"; //кодировка
    static BASE64Encoder enc = new BASE64Encoder();
    static BASE64Decoder dec = new BASE64Decoder();

    public static String base64encode(String text){
        try {
            String rez = enc.encode(text.getBytes( DEFAULT_ENCODING ) );
            return rez;
        }
        catch ( UnsupportedEncodingException e ) {
            return null;
        }
    }

    public static String base64decode(String text){

        try {
            return new String(dec.decodeBuffer( text ),DEFAULT_ENCODING);
        }
        catch ( IOException e ) {
            return null;
        }

    }//base64decode

    public static void main(String[] args){
        String txt="отксореннаяфраза" ;
        String key="ключевое слово для ксора";
        System.out.println(txt + " отксорена в : " + (txt=xorMessage( txt, key )));
        String encoded=base64encode(txt);
        System.out.println( " is encoded to: "+ encoded +" and that is decoding to: "+ (txt = base64decode( encoded )));
        System.out.print( "XOR-ing back to original: " + xorMessage( txt, key ) );

    }

    public static String xorMessage(String message, String key){
        try {
            if (message==null || key==null ) {
                return null;
            }

            char[] keys = key.toCharArray();
            char[] messages = message.toCharArray();

            int ml = messages.length;
            int kl = keys.length;
            char[] newMsg = new char[ml];

            for (int i=0; i<ml; i++){
                newMsg[i]=(char)(messages[i]^keys[i%kl]);
            }
            return new String(newMsg);
        }
        catch ( Exception e ) {
            return null;
        }
    }

}