Add hid preamble handle function for standalone

armsrc/Standalone/lf_hidbrute.c

@@ -257,7 +257,7 @@ void hid_corporate_1000_calculate_checksum_and_set(uint32_t *high, uint32_t *low
 
     // Calculate new high and low base value from card number and facility code, without parity
     new_low = (fc << 21) | (cardnum << 1);
-    new_high = 0x28 | ((fc >> 11) & 1); // 0x28 is 101000
+    new_high = (fc >> 11) & 1;
 
     int n_ones;
     uint32_t i;
@@ -319,6 +319,7 @@ void hid_corporate_1000_calculate_checksum_and_set(uint32_t *high, uint32_t *low
         new_high = new_high | 0x4;
 
     // Setting new calculated values
+    add_HID_preamble(0, &new_high, &new_low, 35);
     *low = new_low;
     *high = new_high;
 }

armsrc/Standalone/lf_hidfcbrute.c

@@ -176,8 +176,7 @@ void hid_calculate_checksum_and_set(uint32_t *high, uint32_t *low, uint32_t card
     newlow |= oddparity32((newlow >> 1) & 0xFFF);
     newlow |= (evenparity32((newlow >> 13) & 0xFFF)) << 25;
 
-    newhigh |= 0x20; // Bit 37; standard header
+    add_HID_preamble(NULL, &newhigh, &newlow, 26);
-    newlow |= 1U << 26; // leading 1: start bit
 
     *low = newlow;
     *high = newhigh;

armsrc/Standalone/lf_prox2brute.c

@@ -16,8 +16,8 @@
 //-----------------------------------------------------------------------------
 // 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
+//     Following code is a trivial brute forcer (H10301 26-bit) when you know the
-//     code and want to find valid(s) card number(s). It will try all card
+//     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).
@@ -46,8 +46,7 @@ void RunMod(void) {
     StandAloneMode();
     Dbprintf(">>  LF HID proxII bruteforce v2 a.k.a Prox2Brute Started <<");
     FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
-
+    uint32_t high = 0, low = 0;
-    const uint32_t high = 0x20; // LF high value is always 0x20 here
 
     uint32_t fac = FACILITY_CODE, cardnum = 0;
 
@@ -79,9 +78,10 @@ void RunMod(void) {
         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
-        uint32_t low = (cardnum << 1) | (fac << 17);
+        low = (cardnum << 1) | (fac << 17);
         low |= oddparity32((low >> 1) & 0xFFF);
         low |= evenparity32((low >> 13) & 0xFFF) << 25;
+        add_HID_preamble(NULL, &high, &low, 26);
 
         Dbprintf("[=] trying Facility = %08x, Card = %08x, raw = %08x%08x",
                  fac, cardnum, high, low);

armsrc/lfops.c

@@ -944,6 +944,33 @@ static void fcAll(uint8_t fc, int *n, uint8_t clock, int16_t *remainder) {
     }
 }
 
+bool add_HID_preamble(uint32_t *hi2, uint32_t *hi, uint32_t *lo, uint8_t length){
+    // Invalid value
+    if (length > 84 || length == 0)
+        return false;
+
+    if (length == 48) {
+        *hi |= 1U << (length - 32); // Example leading 1: start bit
+        return true;
+    }
+    if (length >= 64) {
+        *hi2 |= 0x09e00000; // Extended-length header
+        *hi2 |= 1U << (length - 64); // leading 1: start bit
+    } else if (length > 37) {
+        *hi2 |= 0x09e00000; // Extended-length header
+        *hi |= 1U << (length - 32); // leading 1: start bit
+    } else if (length == 37) {
+        // No header bits added to 37-bit cards
+    } else if (length >= 32) {
+        *hi |= 0x20; // Bit 37; standard header
+       *hi |= 1U << (length - 32); // leading 1: start bit
+    } else {
+        *hi |= 0x20; // Bit 37; standard header
+        *lo |= 1U << length; // leading 1: start bit
+    }
+    return true;
+}
+
 // prepare a waveform pattern in the buffer based on the ID given then
 // simulate a HID tag until the button is pressed
 void CmdHIDsimTAGEx(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT, bool ledcontrol, int numcycles) {

armsrc/lfops.h

@@ -34,6 +34,7 @@ void SimulateTagLowFrequencyEx(int period, int gap, bool ledcontrol, int numcycl
 void SimulateTagLowFrequency(int period, int gap, bool ledcontrol);
 void SimulateTagLowFrequencyBidir(int divisor, int max_bitlen);
 
+bool add_HID_preamble(uint32_t *hi2, uint32_t *hi, uint32_t *lo, uint8_t length);
 void CmdHIDsimTAGEx(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT, bool ledcontrol, int numcycles);
 void CmdHIDsimTAG(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT, bool ledcontrol);