File size: 1,526 Bytes
5c59a6a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | 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, 0x61, 0x6d, 0x37, 0x6d, 0x6d, 0x6d,
};
for (int i=0; i<32; i++) {
if (((passBytes[i] ^ 0x55) - myBytes[i]) != 0) {
return false;
}
}
return true;
}
}
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