irnYPC2N

1package p;
2
3import java.util.concurrent.TimeUnit;
4
5import javax.crypto.*;
6import javax.crypto.spec.*;
7
8public class prueba {
9
10	static String alg = "HmacSHA1";
11
12	public static void main(String[] args) {
13		prueba();
14	}
15
16	public static void prueba() {
17		long startTime = System.currentTimeMillis();
18		for(int a=0;a<=255;a++) {
19			for(int b=0;b<=255;b++) {
20				for(int c=0;c<=255;c++) {
21					for(int d=0;d<=255;d++) {
22						String msg = "231456789 487654 500";
23						byte[] decodedKey = {(byte) a, (byte) b, (byte) c, (byte) d};
24						String resumen = performMACTest(msg, decodedKey);
25						
26						if(resumen.equals("1abe3f04cf4c96f6e94b7b81ef021c0a973e8983")) {
27							System.out.println("Mensaje         : " + msg);
28							System.out.println("Clave Byte      : "+ decodedKey + "\t\tClave Hex       : "+ byteArrayToHexString(decodedKey) + "\t\tString : " + new String(decodedKey));
29							System.out.println("HMAC generada   : " + resumen);
30							
31							long endTime = TimeUnit.MILLISECONDS.toMinutes(System.currentTimeMillis() - startTime);
32							System.out.println("Valores de los bytes: " + (byte)a + "-" + (byte)b + "-" + (byte)c + "-" + (byte)d);
33							System.out.println("Ha tardado "+endTime+" minutos en conseguir la clave.");
34				        	System.exit(0);
35						}
36					}
37				}
38			}
39		}
40	}
41		
42	public static String performMACTest(String s, byte[] decodedKey) {
43		String st = "";
44		try {
45			Mac mac = Mac.getInstance(alg);
46			SecretKey key = new SecretKeySpec(decodedKey, 0, decodedKey.length,
47					alg);
48			mac.init(key);
49			mac.update(s.getBytes());
50			byte[] b = mac.doFinal();
51			st = byteArrayToHexString(b);
52		} catch (Exception e) {
53			System.out.println(e.getMessage());
54		}
55		return st;
56	}
57
58	private static String[] hexDigits = { "0", "1", "2", "3", "4", "5", "6",
59			"7", "8", "9", "a", "b", "c", "d", "e", "f" };
60
61	// Convierte un byte a una cadena hexadecimal
62	public static String byteToHexString(byte b) {
63		int n = b;
64		if (n < 0)
65			n = 256 + n;
66		int d1 = n / 16;
67		int d2 = n % 16;
68		return hexDigits[d1] + hexDigits[d2];
69	}
70
71	// Convierte un array de bytes a una cadena hexadecimal
72	public static String byteArrayToHexString(byte[] b) {
73		String result = "";
74		for (int i = 0; i < b.length; ++i)
75			result += byteToHexString(b[i]);
76		return result;
77	}
78}