package com.company;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Scanner;

public class Main {
    final static String API_URL = "http://172.16.11.21:8080/PadServer/decrypt.html?ID=1702843&MSG=";

    public static boolean get(String key) throws IOException {
        URL weather_url = new URL(API_URL + key);
        InputStream stream = (InputStream) weather_url.getContent();
        Scanner in = new Scanner(stream);
        while (in.hasNext()) {
            String line = in.nextLine();
            if (line.lastIndexOf("decryption correct") != -1)
                return true;
        }
        return false;
    }

    public static void main(String[] args) throws IOException {
        String begin = "a69721e942febfa6123deeb3e2906c430b6b429b72c1790cc374515613baf7d9";
        String end = "44f72997824d103c21f2e7910e96ce01";

        for (int i = 0; i < 16; i++) {

            int v = Integer.valueOf(begin.substring(64 - i*2 - 2, 64 - i*2));

            for (int i = 0; i < 256; i++) {
                int r = v ^ 2 ^ i;
                String hex = Integer.toHexString(r);
                if (get(begin + hex + end)) {
                    System.out.println(begin + hex + " " + end);
                    System.out.println((char) i);
                    System.out.println(Integer.toHexString(v ^ 3 ^ i));
                }
            }
        }
    }
}
// mo    a69721e942febfa6123deeb3e2906c43 0b6b429b72c1790cc374515613baf7d9 44f72997824d103c21f2e7910e96ce01 8883b4167bd671d5932f99631445ee8c