package ssii;

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;

public class Test {

	public static void main(final String[] args) throws InvalidKeyException {
		// TODO Auto-generated method stub

		String aux = "18dd06c4ecb143659564c947e83a9f009254d533";
		String message = "34567891 987654 300";
		String base64_mac = aux.toUpperCase();
		int i = 0;
		int counter = 0;
		while (i == 0) {

			try {
				Mac mac1 = Mac.getInstance("HmacSHA1");

				KeyGenerator kg = KeyGenerator.getInstance("HmacSHA1");
				kg.init(32);
				SecretKey clave = kg.generateKey();

				mac1.init(clave);

				mac1.update(message.getBytes());

				byte[] b = mac1.doFinal();

				String s = javax.xml.bind.DatatypeConverter.printHexBinary(b);
				s.toUpperCase();
				if (base64_mac.getBytes().equals(b)) {
					System.out.println("true");
				}
				if (base64_mac.equals(s)) {
					i = 1;
					System.out.println("CLAVE ENCONTRADA: " + Base64.getEncoder().encodeToString(clave.getEncoded()));

					break;
				} else {
					counter++;
					if (counter % 1000000 == 0) {
						System.out.println("Iteración: " + counter);
						System.out.println("MAC ENCONTRADO   : " + javax.xml.bind.DatatypeConverter.printHexBinary(b));
						System.out.println("BUSCAMOS: " + base64_mac);
						System.out.println("CLAVE PROBADA: " + Base64.getEncoder().encodeToString(clave.getEncoded()));


					}
				}

			} catch (NoSuchAlgorithmException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

	}

}