rev/vault_door_4

rev/vault_door_4/VaultDoor4.java

@@ -0,0 +1,45 @@
+import java.util.*;
+
+class VaultDoor4 {
+    public static void main(String args[]) {
+        VaultDoor4 vaultDoor = new VaultDoor4();
+        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!");
+        }
+    }
+
+    // I made myself dizzy converting all of these numbers into different bases,
+    // so I just *know* that this vault will be impenetrable. This will make Dr.
+    // Evil like me better than all of the other minions--especially Minion
+    // #5620--I just know it!
+    //
+    //  .:::.   .:::.
+    // :::::::.:::::::
+    // :::::::::::::::
+    // ':::::::::::::'
+    //   ':::::::::'
+    //     ':::::'
+    //       ':'
+    // -Minion #7781
+    public boolean checkPassword(String password) {
+        byte[] passBytes = password.getBytes();
+        byte[] myBytes = {
+            106 , 85  , 53  , 116 , 95  , 52  , 95  , 98  ,
+            0x55, 0x6e, 0x43, 0x68, 0x5f, 0x30, 0x66, 0x5f,
+            0142, 0131, 0164, 063 , 0163, 0137, 061 , 063 ,
+            'd' , 'f' , '6' , '1' , '8' , 'a' , '2' , '3' ,
+        };
+        for (int i=0; i<32; i++) {
+            if (passBytes[i] != myBytes[i]) {
+                return false;
+            }
+        }
+        return true;
+    }
+}

rev/vault_door_4/solve.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+
+# byte[] myBytes = {
+#   106 , 85  , 53  , 116 , 95  , 52  , 95  , 98  ,
+#   0x55, 0x6e, 0x43, 0x68, 0x5f, 0x30, 0x66, 0x5f,
+#   0142, 0131, 0164, 063 , 0163, 0137, 061 , 063 ,
+#   'd' , 'f' , '6' , '1' , '8' , 'a' , '2' , '3' ,
+# };
+
+my_bytes = [
+  106 , 85  , 53  , 116 , 95  , 52  , 95  , 98  ,
+  0x55, 0x6e, 0x43, 0x68, 0x5f, 0x30, 0x66, 0x5f,
+  0o142, 0o131, 0o164, 0o63 , 0o163, 0o137, 0o61 , 0o63 ,
+  'd' , 'f' , '6' , '1' , '8' , 'a' , '2' , '3' ,
+]
+
+def main():
+    print('picoCTF{', end='')
+    for x in my_bytes:
+        if type(x) == int:
+            print(chr(x), end='')
+        else:
+            print(x, end='')
+    print('}')
+
+if __name__ == '__main__':
+    main()
+