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@Svenito /GetIt.java Secret
Created Apr 24, 2014

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Get that egg
import java.awt.Graphics;
import java.util.Arrays;
import java.awt.image.BufferedImage;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.io.ByteArrayInputStream;
import java.security.*; //MessageDigest;
import javax.crypto.*;
import javax.crypto.spec.*;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.io.File;
import org.apache.commons.codec.binary.Base64;
class GetIt {
public static boolean checkMD5(String src, String target) throws NoSuchAlgorithmException {
MessageDigest digest = MessageDigest.getInstance("MD5");
byte t[] = Base64.decodeBase64(target);
byte b1[] = src.getBytes();
for (int i = 0; i <= 9999; i++) {
digest.update(b1);
b1 = digest.digest(b1);
if (Arrays.equals(b1, t)) {
System.out.printf("%s %d\n", src, i);
return true;
}
}
return false;
}
public static void checkSHA1(String src, String target) throws NoSuchAlgorithmException {
MessageDigest digest = MessageDigest.getInstance("SHA1");
byte t[] = Base64.decodeBase64(target);
byte b2[] = src.getBytes();
for (int i = 0; i <= 9999; i++) {
digest.update(b2);
b2 = digest.digest(b2);
b2[0] = 99;
b2 = digest.digest(b2);
if (Arrays.equals(b2, t)) {
System.out.printf("%d\n", i+1);
}
}
}
public static void checkAES(String src, String target) throws Exception {
byte t[] = Base64.decodeBase64(target);
byte b3[] = src.getBytes();
for (int i = 0; i <= 9999; i++) {
byte iv[] = new byte[16];
IvParameterSpec ips = new IvParameterSpec(iv);
Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");
String test = String.format("%04d", i);
SecretKeySpec k = new SecretKeySpec((new StringBuilder(String.valueOf(test))).append(test).append(test).append(test).toString().getBytes(), "AES");
c.init(1, k, ips);
byte out[] = c.doFinal(b3);
if (Arrays.equals(out, t)) {
System.out.printf("Found %d\n", i);
break;
}
}
}
private static byte[] decrypt(String pass, String file)
throws Exception {
byte data[] = Files.readAllBytes(Paths.get(file, new String[0]));
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
java.security.spec.KeySpec spec = new PBEKeySpec(pass.toCharArray(), SALT, 0x10000, 128);
SecretKey tmp = factory.generateSecret(spec);
SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secret, ips);
return cipher.doFinal(data);
}
private static String PATTERN = "([0-9]{4}-){3}[0-9]{4}";
private static byte SALT[] = {
4, 115, 33, -116, 126, -56, -114, -103
};
private static final byte iv[];
private static final IvParameterSpec ips;
private static final String f = "1453-9373-4587-8030";
static {
iv = new byte[16];
ips = new IvParameterSpec(iv);
}
public static void main(String[] args) throws Exception {
System.out.println("Getting parts 1 and 2");
for (int i = 0; i <= 9999; i++) {
String num = String.format("%04d", i);
if (checkMD5(num, "Q4jgwADL0QO0H7CNPMhxJw==")) {
break;
}
}
System.out.println("Getting part 3");
checkSHA1("8122", "KMZ9wInjZg0C4R0EkZSjKYsonN8=");
System.out.println("Getting part 4");
checkAES("8122","zG+hH0zVgJvd0aaUsoUXlg==");
byte imageData[] = decrypt("8122-4901-6001-2311", "1.png");
final BufferedImage image = ImageIO.read(new ByteArrayInputStream(imageData));
File outputfile = new File("image.jpg");
ImageIO.write(image, "png", outputfile);
}
}
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