43 lines
1.5 KiB
Java
Executable File
43 lines
1.5 KiB
Java
Executable File
import java.util.*;
|
|
|
|
class VaultDoor6 {
|
|
public static void main(String args[]) {
|
|
VaultDoor6 vaultDoor = new VaultDoor6();
|
|
Scanner scanner = new Scanner(System.in);
|
|
System.out.print("Enter vault password: ");
|
|
String userInput = scanner.next();
|
|
String input = userInput.substring("picoCTF{".length(),userInput.length()-1);
|
|
if (vaultDoor.checkPassword(input)) {
|
|
System.out.println("Access granted.");
|
|
} else {
|
|
System.out.println("Access denied!");
|
|
}
|
|
}
|
|
|
|
// Dr. Evil gave me a book called Applied Cryptography by Bruce Schneier,
|
|
// and I learned this really cool encryption system. This will be the
|
|
// strongest vault door in Dr. Evil's entire evil volcano compound for sure!
|
|
// Well, I didn't exactly read the *whole* book, but I'm sure there's
|
|
// nothing important in the last 750 pages.
|
|
//
|
|
// -Minion #3091
|
|
public boolean checkPassword(String password) {
|
|
if (password.length() != 32) {
|
|
return false;
|
|
}
|
|
byte[] passBytes = password.getBytes();
|
|
byte[] myBytes = {
|
|
0x3b, 0x65, 0x21, 0xa , 0x38, 0x0 , 0x36, 0x1d,
|
|
0xa , 0x3d, 0x61, 0x27, 0x11, 0x66, 0x27, 0xa ,
|
|
0x21, 0x1d, 0x61, 0x3b, 0xa , 0x2d, 0x65, 0x27,
|
|
0xa , 0x6c, 0x60, 0x37, 0x30, 0x60, 0x31, 0x36,
|
|
};
|
|
for (int i=0; i<32; i++) {
|
|
if (((passBytes[i] ^ 0x55) - myBytes[i]) != 0) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
}
|