XOR in Java: Compile it: javac -cp commons-codec-1.8/commons-codec-1.8.jar StringXORer.java Run it: java -cp ".:commons-codec-1.8/commons-codec-1.8.jar" StringXORer

StringXORer.java

import org.apache.commons.codec.binary.Base64;

public class StringXORer {

    public static void main(String[] args) {

        StringXORer x = new StringXORer();
        String a="hello";
        String b="world";
        System.out.println(a);
        System.out.println(b);
        String c = x.encode(a, b);
        System.out.println(c);
        String d = x.decode(c, b);
        System.out.println(d);
    }

    public String encode(String s, String key) {
        return Base64.encodeBase64String(xorWithKey(s.getBytes(), key.getBytes()));
    }

    public String decode(String s, String key) {
        return new String(xorWithKey(Base64.decodeBase64(s), key.getBytes()));
    }

    private byte[] xorWithKey(byte[] a, byte[] key) {
        byte[] out = new byte[a.length];
        for (int i = 0; i < a.length; i++) {
            out[i] = (byte) (a[i] ^ key[i%key.length]);
        }
        return out;
    }
}

Compile it: javac -cp commons-codec-1.8/commons-codec-1.8.jar StringXORer.java
Run it: java -cp ".:commons-codec-1.8/commons-codec-1.8.jar" StringXORer

cool