]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/hitag2.c
CHG: moved to header file. common.h has RAMFUNC definition
[proxmark3-svn] / armsrc / hitag2.c
index aa9ce237f8d0facb73b79137076a4e73f3515db4..0fab407f113af2c63348df04fcf57a2153dcd2c0 100644 (file)
 #include "util.h"
 #include "hitag2.h"
 #include "string.h"
+#include "BigBuf.h"
 
 static bool bQuiet;
-
-bool bCrypto;
-bool bAuthenticating;
-bool bPwd;
-bool bSuccessful;
-
-size_t nbytes(size_t nbits) {
-       return (nbits/8)+((nbits%8)>0);
-}
-
-int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int bReader)
-{
-  // Return when trace is full
-  if (traceLen >= TRACE_SIZE) return FALSE;
-  
-  // Trace the random, i'm curious
-  rsamples += iSamples;
-  trace[traceLen++] = ((rsamples >> 0) & 0xff);
-  trace[traceLen++] = ((rsamples >> 8) & 0xff);
-  trace[traceLen++] = ((rsamples >> 16) & 0xff);
-  trace[traceLen++] = ((rsamples >> 24) & 0xff);
-  if (!bReader) {
-    trace[traceLen - 1] |= 0x80;
-  }
-  trace[traceLen++] = ((dwParity >> 0) & 0xff);
-  trace[traceLen++] = ((dwParity >> 8) & 0xff);
-  trace[traceLen++] = ((dwParity >> 16) & 0xff);
-  trace[traceLen++] = ((dwParity >> 24) & 0xff);
-  trace[traceLen++] = iBits;
-  memcpy(trace + traceLen, btBytes, nbytes(iBits));
-  traceLen += nbytes(iBits);
-  return TRUE;
-}
+static bool bCrypto;
+static bool bAuthenticating;
+static bool bPwd;
+static bool bSuccessful;
 
 struct hitag2_tag {
        uint32_t uid;
@@ -89,21 +61,17 @@ static struct hitag2_tag tag = {
     },
 };
 
-//#define TRACE_LENGTH 3000
-//uint8_t *trace = (uint8_t *) BigBuf;
-//int traceLen = 0;
-//int rsamples = 0;
+// ToDo: define a meaningful maximum size for auth_table. The bigger this is, the lower will be the available memory for traces. 
+// Historically it used to be FREE_BUFFER_SIZE, which was 2744.
+#define AUTH_TABLE_LENGTH 2744
+static byte_t* auth_table;
+static size_t auth_table_pos = 0;
+static size_t auth_table_len = AUTH_TABLE_LENGTH;
 
-#define AUTH_TABLE_OFFSET FREE_BUFFER_OFFSET
-#define AUTH_TABLE_LENGTH FREE_BUFFER_SIZE
-byte_t* auth_table = (byte_t *)BigBuf+AUTH_TABLE_OFFSET;
-size_t auth_table_pos = 0;
-size_t auth_table_len = AUTH_TABLE_LENGTH;
-
-byte_t password[4];
-byte_t NrAr[8];
-byte_t key[8];
-uint64_t cipher_state;
+static byte_t password[4];
+static byte_t NrAr[8];
+static byte_t key[8];
+static uint64_t cipher_state;
 
 /* Following is a modified version of cryptolib.com/ciphers/hitag2/ */
 // Software optimized 48-bit Philips/NXP Mifare Hitag2 PCF7936/46/47/52 stream cipher algorithm by I.C. Wiener 2006-2007.
@@ -126,7 +94,6 @@ uint64_t cipher_state;
 #define rotl64(x, n)   ((((u64)(x))<<((n)&63))+(((u64)(x))>>((0-(n))&63)))
 
 // Single bit Hitag2 functions:
-
 #define i4(x,a,b,c,d)  ((u32)((((x)>>(a))&1)+(((x)>>(b))&1)*2+(((x)>>(c))&1)*4+(((x)>>(d))&1)*8))
 
 static const u32 ht2_f4a = 0x2C79;             // 0010 1100 0111 1001
@@ -135,7 +102,7 @@ static const u32 ht2_f5c = 0x7907287B;      // 0111 1001 0000 0111 0010 1000 0111 101
 
 static u32 _f20 (const u64 x)
 {
-       u32                                     i5;
+       u32     i5;
 
        i5 = ((ht2_f4a >> i4 (x, 1, 2, 4, 5)) & 1)* 1
           + ((ht2_f4b >> i4 (x, 7,11,13,14)) & 1)* 2
@@ -148,8 +115,8 @@ static u32 _f20 (const u64 x)
 
 static u64 _hitag2_init (const u64 key, const u32 serial, const u32 IV)
 {
-       u32                                     i;
-       u64                                     x = ((key & 0xFFFF) << 32) + serial;
+       u32     i;
+       u64     x = ((key & 0xFFFF) << 32) + serial;
 
        for (i = 0; i < 32; i++)
        {
@@ -161,7 +128,7 @@ static u64 _hitag2_init (const u64 key, const u32 serial, const u32 IV)
 
 static u64 _hitag2_round (u64 *state)
 {
-       u64                                     x = *state;
+       u64 x = *state;
 
        x = (x >>  1) +
         ((((x >>  0) ^ (x >>  2) ^ (x >>  3) ^ (x >>  6)
@@ -173,24 +140,31 @@ static u64 _hitag2_round (u64 *state)
        return _f20 (x);
 }
 
+// "MIKRON"             =  O  N  M  I  K  R
+// Key                  = 4F 4E 4D 49 4B 52             - Secret 48-bit key
+// Serial               = 49 43 57 69                   - Serial number of the tag, transmitted in clear
+// Random               = 65 6E 45 72                   - Random IV, transmitted in clear
+//~28~DC~80~31  = D7 23 7F CE                   - Authenticator value = inverted first 4 bytes of the keystream
+
+// The code below must print out "D7 23 7F CE 8C D0 37 A9 57 49 C1 E6 48 00 8A B6".
+// The inverse of the first 4 bytes is sent to the tag to authenticate.
+// The rest is encrypted by XORing it with the subsequent keystream.
+
 static u32 _hitag2_byte (u64 * x)
 {
-       u32                                     i, c;
+       u32     i, c;
 
        for (i = 0, c = 0; i < 8; i++) c += (u32) _hitag2_round (x) << (i^7);
        return c;
 }
 
-int hitag2_reset(void)
-{
+static int hitag2_reset(void) {
        tag.state = TAG_STATE_RESET;
        tag.crypto_active = 0;
        return 0;
 }
 
-int hitag2_init(void)
-{
-//     memcpy(&tag, &resetdata, sizeof(tag));
+static int hitag2_init(void) {
        hitag2_reset();
        return 0;
 }
@@ -252,16 +226,16 @@ static int hitag2_cipher_transcrypt(uint64_t* cs, byte_t *data, unsigned int byt
 #define HITAG_T_WAIT_2 90 /* T_wresp should be 199..206 */
 #define HITAG_T_WAIT_MAX 300 /* bit more than HITAG_T_WAIT_1 + HITAG_T_WAIT_2 */
 
-#define HITAG_T_TAG_ONE_HALF_PERIOD                    10
-#define HITAG_T_TAG_TWO_HALF_PERIOD                    25
-#define HITAG_T_TAG_THREE_HALF_PERIOD          41 
-#define HITAG_T_TAG_FOUR_HALF_PERIOD    57 
+#define HITAG_T_TAG_ONE_HALF_PERIOD            10
+#define HITAG_T_TAG_TWO_HALF_PERIOD            25
+#define HITAG_T_TAG_THREE_HALF_PERIOD  41 
+#define HITAG_T_TAG_FOUR_HALF_PERIOD   57 
 
-#define HITAG_T_TAG_HALF_PERIOD                                        16
-#define HITAG_T_TAG_FULL_PERIOD                                        32
+#define HITAG_T_TAG_HALF_PERIOD                        16
+#define HITAG_T_TAG_FULL_PERIOD                        32
 
-#define HITAG_T_TAG_CAPTURE_ONE_HALF           13
-#define HITAG_T_TAG_CAPTURE_TWO_HALF           25
+#define HITAG_T_TAG_CAPTURE_ONE_HALF   13
+#define HITAG_T_TAG_CAPTURE_TWO_HALF   25
 #define HITAG_T_TAG_CAPTURE_THREE_HALF 41 
 #define HITAG_T_TAG_CAPTURE_FOUR_HALF   57 
 
@@ -304,7 +278,8 @@ static void hitag_send_frame(const byte_t* frame, size_t frame_len)
        LOW(GPIO_SSC_DOUT);
 }
 
-void hitag2_handle_reader_command(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen)
+
+static void hitag2_handle_reader_command(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen)
 {
        byte_t rx_air[HITAG_FRAME_LEN];
        
@@ -439,7 +414,7 @@ static void hitag_reader_send_bit(int bit) {
        // Binary puls length modulation (BPLM) is used to encode the data stream
        // This means that a transmission of a one takes longer than that of a zero
        
-       // Enable modulation, which means, drop the the field
+       // Enable modulation, which means, drop the field
        HIGH(GPIO_SSC_DOUT);
        
        // Wait for 4-10 times the carrier period
@@ -452,15 +427,15 @@ static void hitag_reader_send_bit(int bit) {
        if(bit == 0) {
                // Zero bit: |_-|
                while(AT91C_BASE_TC0->TC_CV < T0*22);
-               //              SpinDelayUs(16*8);
+
        } else {
                // One bit: |_--|
                while(AT91C_BASE_TC0->TC_CV < T0*28);
-               //              SpinDelayUs(22*8);
        }
        LED_A_OFF();
 }
 
+
 static void hitag_reader_send_frame(const byte_t* frame, size_t frame_len)
 {
        // Send the content of the frame
@@ -469,7 +444,7 @@ static void hitag_reader_send_frame(const byte_t* frame, size_t frame_len)
        }
        // Send EOF 
        AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG;
-       // Enable modulation, which means, drop the the field
+       // Enable modulation, which means, drop the field
        HIGH(GPIO_SSC_DOUT);
        // Wait for 4-10 times the carrier period
        while(AT91C_BASE_TC0->TC_CV < T0*6);
@@ -479,7 +454,7 @@ static void hitag_reader_send_frame(const byte_t* frame, size_t frame_len)
 
 size_t blocknr;
 
-bool hitag2_password(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
+static bool hitag2_password(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
        // Reset the transmission frame length
        *txlen = 0;
        
@@ -502,26 +477,26 @@ bool hitag2_password(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen)
                                *txlen = 32;
                                memcpy(tx,password,4);
                                bPwd = true;
-        memcpy(tag.sectors[blocknr],rx,4);
-        blocknr++;
+                               memcpy(tag.sectors[blocknr],rx,4);
+                               blocknr++;
                        } else {
                                
-                       if(blocknr == 1){
-                               //store password in block1, the TAG answers with Block3, but we need the password in memory
-                               memcpy(tag.sectors[blocknr],tx,4);
-                       }else{
-                               memcpy(tag.sectors[blocknr],rx,4);
-                       }
-                       
-                       blocknr++;
-                       if (blocknr > 7) {
-                         DbpString("Read succesful!");
-        bSuccessful = true;
-                         return false;
-                       }
-                       *txlen = 10;
-                       tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2);
-                       tx[1] = ((blocknr^7) << 6);
+                               if(blocknr == 1){
+                                       //store password in block1, the TAG answers with Block3, but we need the password in memory
+                                       memcpy(tag.sectors[blocknr],tx,4);
+                               } else {
+                                       memcpy(tag.sectors[blocknr],rx,4);
+                               }
+                               
+                               blocknr++;
+                               if (blocknr > 7) {
+                                       DbpString("Read succesful!");
+                                       bSuccessful = true;
+                                       return false;
+                               }
+                               *txlen = 10;
+                               tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2);
+                               tx[1] = ((blocknr^7) << 6);
                        }
                } break;
                        
@@ -534,7 +509,7 @@ bool hitag2_password(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen)
        return true;
 }
 
-bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
+static bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
        // Reset the transmission frame length
        *txlen = 0;
        
@@ -571,9 +546,9 @@ bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
           bCrypto = false;
         }
                        } else {
-        *txlen = 5;
-        memcpy(tx,"\xc0",nbytes(*txlen));
-      }
+                               *txlen = 5;
+                               memcpy(tx,"\xc0",nbytes(*txlen));
+                       }
                } break;
                        
       // Received UID, crypto tag answer
@@ -587,20 +562,20 @@ bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
         hitag2_cipher_transcrypt(&cipher_state,tx+4,4,0);
                                *txlen = 64;
                                bCrypto = true;
-        bAuthenticating = true;
+                               bAuthenticating = true;
                        } else {
         // Check if we received answer tag (at)
         if (bAuthenticating) {
-          bAuthenticating = false;
+                       bAuthenticating = false;
         } else {
-          // Store the received block
-          memcpy(tag.sectors[blocknr],rx,4);
-          blocknr++;
+                       // Store the received block
+                       memcpy(tag.sectors[blocknr],rx,4);
+                       blocknr++;
         }
         if (blocknr > 7) {
-          DbpString("Read succesful!");
-          bSuccessful = true;
-          return false;
+                       DbpString("Read succesful!");
+                       bSuccessful = true;
+                       return false;
         }
         *txlen = 10;
         tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2);
@@ -616,18 +591,18 @@ bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
        }
        
   
-  if(bCrypto) {
-    // We have to return now to avoid double encryption
-    if (!bAuthenticating) {
-      hitag2_cipher_transcrypt(&cipher_state,tx,*txlen/8,*txlen%8);
-    }
+       if(bCrypto) {
+               // We have to return now to avoid double encryption
+               if (!bAuthenticating) {
+                 hitag2_cipher_transcrypt(&cipher_state, tx, *txlen/8, *txlen%8);
+               }
        }
 
        return true;
 }
 
 
-bool hitag2_authenticate(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
+static bool hitag2_authenticate(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
        // Reset the transmission frame length 
        *txlen = 0;
        
@@ -652,8 +627,7 @@ bool hitag2_authenticate(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txl
                                bCrypto = true;
                        } else {
                                DbpString("Authentication succesful!");
-                               // We are done... for now
-                               return false;
+                               return true;
                        }
                } break;
                        
@@ -667,7 +641,9 @@ bool hitag2_authenticate(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txl
        return true;
 }
 
-bool hitag2_test_auth_attempts(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
+
+static bool hitag2_test_auth_attempts(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
+
        // Reset the transmission frame length 
        *txlen = 0;
        
@@ -679,17 +655,17 @@ bool hitag2_test_auth_attempts(byte_t* rx, const size_t rxlen, byte_t* tx, size_
                        if (bCrypto) {
                                Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x Failed, removed entry!",NrAr[0],NrAr[1],NrAr[2],NrAr[3],NrAr[4],NrAr[5],NrAr[6],NrAr[7]);
 
-        // Removing failed entry from authentiations table
-        memcpy(auth_table+auth_table_pos,auth_table+auth_table_pos+8,8);
-        auth_table_len -= 8;
+                               // Removing failed entry from authentiations table
+                               memcpy(auth_table+auth_table_pos,auth_table+auth_table_pos+8,8);
+                               auth_table_len -= 8;
 
-        // Return if we reached the end of the authentiactions table
+                               // Return if we reached the end of the authentications table
                                bCrypto = false;
                                if (auth_table_pos == auth_table_len) {
                                        return false;
                                }
-        
-        // Copy the next authentication attempt in row (at the same position, b/c we removed last failed entry)
+
+                               // Copy the next authentication attempt in row (at the same position, b/c we removed last failed entry)
                                memcpy(NrAr,auth_table+auth_table_pos,8);
                        }
                        *txlen = 5;
@@ -722,6 +698,43 @@ bool hitag2_test_auth_attempts(byte_t* rx, const size_t rxlen, byte_t* tx, size_
        return true;
 }
 
+static bool hitag2_read_uid(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) {
+       // Reset the transmission frame length
+       *txlen = 0;
+
+       // Try to find out which command was send by selecting on length (in bits)
+       switch (rxlen) {
+               // No answer, try to resurrect
+               case 0: {
+                       // Just starting or if there is no answer
+                       *txlen = 5;
+                       memcpy(tx,"\xc0",nbytes(*txlen));
+               } break;
+               // Received UID
+               case 32: {
+                       // Check if we received answer tag (at)
+                       if (bAuthenticating) {
+                               bAuthenticating = false;
+                       } else {
+                               // Store the received block
+                               memcpy(tag.sectors[blocknr],rx,4);
+                               blocknr++;
+                       }
+                       if (blocknr > 0) {
+                               //DbpString("Read successful!");
+                               bSuccessful = true;
+                               return false;
+                       }
+               } break;
+               // Unexpected response
+               default: {
+                       Dbprintf("Uknown frame length: %d",rxlen);
+                       return false;
+               } break;
+       }
+       return true;
+}
+
 void SnoopHitag(uint32_t type) {
        int frame_count;
        int response;
@@ -734,12 +747,19 @@ void SnoopHitag(uint32_t type) {
        byte_t rx[HITAG_FRAME_LEN];
        size_t rxlen=0;
        
+       FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
+       
+       // free eventually allocated BigBuf memory
+       BigBuf_free(); BigBuf_Clear_ext(false);
+       
        // Clean up trace and prepare it for storing frames
-       iso14a_set_tracing(TRUE);
-       iso14a_clear_trace();
-
+       clear_trace();
+       set_tracing(TRUE);
+       
        auth_table_len = 0;
        auth_table_pos = 0;
+
+    auth_table = (byte_t *)BigBuf_malloc(AUTH_TABLE_LENGTH);
        memset(auth_table, 0x00, AUTH_TABLE_LENGTH);
        
        DbpString("Starting Hitag2 snoop");
@@ -747,7 +767,7 @@ void SnoopHitag(uint32_t type) {
        
        // Set up eavesdropping mode, frequency divisor which will drive the FPGA
        // and analog mux selection.
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT  | FPGA_LF_EDGE_DETECT_TOGGLE_MODE);
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
        SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
        RELAY_OFF();
@@ -763,7 +783,7 @@ void SnoopHitag(uint32_t type) {
        AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1);
        AT91C_BASE_PIOA->PIO_BSR = GPIO_SSC_FRAME;
        
-  // Disable timer during configuration        
+       // Disable timer during configuration   
        AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;
        
        // Capture mode, defaul timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger,
@@ -784,7 +804,7 @@ void SnoopHitag(uint32_t type) {
        bSkip = true;
        tag_sof = 4;
        
-       while(!BUTTON_PRESS()) {
+       while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
                // Watchdog hit
                WDT_HIT();
                
@@ -926,7 +946,7 @@ void SnoopHitag(uint32_t type) {
     AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS;
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
     LED_A_OFF();
-       
+       set_tracing(TRUE);
 //     Dbprintf("frame received: %d",frame_count);
 //     Dbprintf("Authentication Attempts: %d",(auth_table_len/8));
 //     DbpString("All done");
@@ -943,11 +963,20 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) {
        bool bQuitTraceFull = false;
        bQuiet = false;
        
+       FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
+
+       // free eventually allocated BigBuf memory
+       BigBuf_free(); BigBuf_Clear_ext(false);
+
        // Clean up trace and prepare it for storing frames
-  iso14a_set_tracing(TRUE);
-  iso14a_clear_trace();
+       clear_trace();
+       set_tracing(TRUE);
+       
        auth_table_len = 0;
        auth_table_pos = 0;
+    byte_t* auth_table;
+
+    auth_table = (byte_t *)BigBuf_malloc(AUTH_TABLE_LENGTH);
        memset(auth_table, 0x00, AUTH_TABLE_LENGTH);
 
        DbpString("Starting Hitag2 simulation");
@@ -970,7 +999,7 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) {
        
        // Set up simulator mode, frequency divisor which will drive the FPGA
        // and analog mux selection.
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD);
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
        SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
        RELAY_OFF();
@@ -989,23 +1018,23 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) {
        AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1);
        AT91C_BASE_PIOA->PIO_BSR = GPIO_SSC_FRAME;
        
-  // Disable timer during configuration        
+    // Disable timer during configuration      
        AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;
 
-       // Capture mode, defaul timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger,
+       // Capture mode, default timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger,
        // external trigger rising edge, load RA on rising edge of TIOA.
        AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK | AT91C_TC_ETRGEDG_RISING | AT91C_TC_ABETRG | AT91C_TC_LDRA_RISING;
        
-       // Enable and reset counter
-       AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
-
        // Reset the received frame, frame count and timing info
        memset(rx,0x00,sizeof(rx));
        frame_count = 0;
        response = 0;
        overflow = 0;
+
+       // Enable and reset counter
+       AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
        
-       while(!BUTTON_PRESS()) {
+       while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
                // Watchdog hit
                WDT_HIT();
                
@@ -1107,9 +1136,9 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) {
        AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;
        AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS;
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-//     Dbprintf("frame received: %d",frame_count);
-//     Dbprintf("Authentication Attempts: %d",(auth_table_len/8));
-//     DbpString("All done");
+       
+       DbpString("Sim Stopped");
+       set_tracing(TRUE);
 }
 
 void ReaderHitag(hitag_function htf, hitag_data* htd) {
@@ -1128,20 +1157,22 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
        bool bStop;
        bool bQuitTraceFull = false;
   
-  // Reset the return status
-  bSuccessful = false;
+       FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
+       // Reset the return status
+       bSuccessful = false;
   
        // Clean up trace and prepare it for storing frames
-  iso14a_set_tracing(TRUE);
-  iso14a_clear_trace();
-       DbpString("Starting Hitag reader family");
+       clear_trace();
+       set_tracing(TRUE);
+       
+       //DbpString("Starting Hitag reader family");
 
        // Check configuration
        switch(htf) {
                case RHT2F_PASSWORD: {
-      Dbprintf("List identifier in password mode");
+                       Dbprintf("List identifier in password mode");
                        memcpy(password,htd->pwd.password,4);
-      blocknr = 0;
+               blocknr = 0;
                        bQuitTraceFull = false;
                        bQuiet = false;
                        bPwd = false;
@@ -1153,32 +1184,39 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
                        Dbhexdump(8,NrAr,false);
                        bQuiet = false;
                        bCrypto = false;
-      bAuthenticating = false;
+                       bAuthenticating = false;
                        bQuitTraceFull = true;
                } break;
       
                case RHT2F_CRYPTO: {
                        DbpString("Authenticating using key:");
-                       memcpy(key,htd->crypto.key,6);
+                       memcpy(key,htd->crypto.key,6);    //HACK; 4 or 6??  I read both in the code.
                        Dbhexdump(6,key,false);
-      blocknr = 0;
+                       blocknr = 0;
                        bQuiet = false;
                        bCrypto = false;
-      bAuthenticating = false;
+                       bAuthenticating = false;
                        bQuitTraceFull = true;
                } break;
 
                case RHT2F_TEST_AUTH_ATTEMPTS: {
                        Dbprintf("Testing %d authentication attempts",(auth_table_len/8));
                        auth_table_pos = 0;
-                       memcpy(NrAr,auth_table,8);
+                       memcpy(NrAr, auth_table, 8);
                        bQuitTraceFull = false;
                        bQuiet = false;
                        bCrypto = false;
                } break;
-                       
+               case RHT2F_UID_ONLY: {
+                       blocknr = 0;
+                       bQuiet = false;
+                       bCrypto = false;
+                       bAuthenticating = false;
+                       bQuitTraceFull = true;
+               } break;
                default: {
                        Dbprintf("Error, unknown function: %d",htf);
+                       set_tracing(FALSE);
                        return;
                } break;
        }
@@ -1228,27 +1266,28 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
        lastbit = 1;
        bStop = false;
 
-  // Tag specific configuration settings (sof, timings, etc.)
-  if (htf < 10){
-    // hitagS settings
-    reset_sof = 1;
-    t_wait = 200;
-    DbpString("Configured for hitagS reader");
-  } else if (htf < 20) {
-    // hitag1 settings
-    reset_sof = 1;
-    t_wait = 200;
-    DbpString("Configured for hitag1 reader");
-  } else if (htf < 30) {
-    // hitag2 settings
-    reset_sof = 4;
-    t_wait = HITAG_T_WAIT_2;
-    DbpString("Configured for hitag2 reader");
+       // Tag specific configuration settings (sof, timings, etc.)
+       if (htf < 10){
+               // hitagS settings
+               reset_sof = 1;
+               t_wait = 200;
+    //DbpString("Configured for hitagS reader");
+       } else if (htf < 20) {
+               // hitag1 settings
+               reset_sof = 1;
+               t_wait = 200;
+    //DbpString("Configured for hitag1 reader");
+       } else if (htf < 30) {
+               // hitag2 settings
+               reset_sof = 4;
+               t_wait = HITAG_T_WAIT_2;
+    //DbpString("Configured for hitag2 reader");
        } else {
-    Dbprintf("Error, unknown hitag reader type: %d",htf);
-    return;
-  }
-               
+               Dbprintf("Error, unknown hitag reader type: %d",htf);
+               set_tracing(FALSE);     
+               return;
+       }
+       uint8_t attempt_count=0;
        while(!bStop && !BUTTON_PRESS()) {
                // Watchdog hit
                WDT_HIT();
@@ -1283,8 +1322,14 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
                        case RHT2F_TEST_AUTH_ATTEMPTS: {
                                bStop = !hitag2_test_auth_attempts(rx,rxlen,tx,&txlen);
                        } break;
+                       case RHT2F_UID_ONLY: {
+                               bStop = !hitag2_read_uid(rx, rxlen, tx, &txlen);
+                               attempt_count++; //attempt 3 times to get uid then quit
+                               if (!bStop && attempt_count == 3) bStop = true;
+                       } break;
                        default: {
                                Dbprintf("Error, unknown function: %d",htf);
+                               set_tracing(FALSE);
                                return;
                        } break;
                }
@@ -1328,6 +1373,8 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
                bSkip = true;
                tag_sof = reset_sof;
                response = 0;
+                       //Dbprintf("DEBUG: Waiting to receive frame");
+               uint32_t errorCount = 0;
                
                // Receive frame, watch for at most T0*EOF periods
                while (AT91C_BASE_TC1->TC_CV < T0*HITAG_T_WAIT_MAX) {
@@ -1377,10 +1424,13 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
                                                rxlen++;
                                        }
                                } else {
+                                               //Dbprintf("DEBUG: Wierd2");
+                                               errorCount++;
                                        // Ignore wierd value, is to small to mean anything
                                }
                        }
-
+                       //if we saw over 100 wierd values break it probably isn't hitag...
+                       if (errorCount >100) break;
                        // We can break this loop if we received the last bit from a frame
                        if (AT91C_BASE_TC1->TC_CV > T0*HITAG_T_EOF) {
                                if (rxlen>0) break;
@@ -1392,7 +1442,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
        AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;
        AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS;
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       Dbprintf("frame received: %d",frame_count);
-  DbpString("All done");
-  cmd_send(CMD_ACK,bSuccessful,0,0,(byte_t*)tag.sectors,48);
-}
+//     Dbprintf("DONE: frame received: %d",frame_count);
+       cmd_send(CMD_ACK,bSuccessful,0,0,(byte_t*)tag.sectors,48);
+       set_tracing(FALSE);
+}
\ No newline at end of file
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