]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/iclass.c
Small lf bug fixes and threshold adjustments
[proxmark3-svn] / armsrc / iclass.c
index 017d5eff7dd1aec437391e072fd2db16566c056f..ea9af7d4f4fa11c9b84f15d4a8ea0ee6314bd02f 100644 (file)
@@ -71,14 +71,13 @@ static struct {
     int     nOutOfCnt;
     int     OutOfCnt;
     int     syncBit;
-    int     parityBits;
     int     samples;
     int     highCnt;
     int     swapper;
     int     counter;
     int     bitBuffer;
     int     dropPosition;
-    uint8_t   *output;
+    uint8_t *output;
 } Uart;
 
 static RAMFUNC int OutOfNDecoding(int bit)
@@ -137,11 +136,8 @@ static RAMFUNC int OutOfNDecoding(int bit)
                                        if(Uart.byteCnt == 0) {
                                                // Its not straightforward to show single EOFs
                                                // So just leave it and do not return TRUE
-                                               Uart.output[Uart.byteCnt] = 0xf0;
+                                               Uart.output[0] = 0xf0;
                                                Uart.byteCnt++;
-
-                                               // Calculate the parity bit for the client...
-                                               Uart.parityBits = 1;
                                        }
                                        else {
                                                return TRUE;
@@ -223,11 +219,6 @@ static RAMFUNC int OutOfNDecoding(int bit)
                                                if(Uart.bitCnt == 8) {
                                                        Uart.output[Uart.byteCnt] = (Uart.shiftReg & 0xff);
                                                        Uart.byteCnt++;
-
-                                                       // Calculate the parity bit for the client...
-                                                       Uart.parityBits <<= 1;
-                                                       Uart.parityBits ^= OddByteParity[(Uart.shiftReg & 0xff)];
-
                                                        Uart.bitCnt = 0;
                                                        Uart.shiftReg = 0;
                                                }
@@ -246,11 +237,6 @@ static RAMFUNC int OutOfNDecoding(int bit)
                                        Uart.dropPosition--;
                                        Uart.output[Uart.byteCnt] = (Uart.dropPosition & 0xff);
                                        Uart.byteCnt++;
-
-                                       // Calculate the parity bit for the client...
-                                       Uart.parityBits <<= 1;
-                                       Uart.parityBits ^= OddByteParity[(Uart.dropPosition & 0xff)];
-
                                        Uart.bitCnt = 0;
                                        Uart.shiftReg = 0;
                                        Uart.nOutOfCnt = 0;
@@ -311,7 +297,6 @@ static RAMFUNC int OutOfNDecoding(int bit)
                                Uart.state = STATE_START_OF_COMMUNICATION;
                                Uart.bitCnt = 0;
                                Uart.byteCnt = 0;
-                               Uart.parityBits = 0;
                                Uart.nOutOfCnt = 0;
                                Uart.OutOfCnt = 4; // Start at 1/4, could switch to 1/256
                                Uart.dropPosition = 0;
@@ -353,7 +338,6 @@ static struct {
     int     bitCount;
     int     posCount;
        int     syncBit;
-       int     parityBits;
     uint16_t    shiftReg;
        int     buffer;
        int     buffer2;
@@ -367,7 +351,7 @@ static struct {
                SUB_SECOND_HALF,
                SUB_BOTH
        }               sub;
-    uint8_t   *output;
+    uint8_t *output;
 } Demod;
 
 static RAMFUNC int ManchesterDecoding(int v)
@@ -420,7 +404,6 @@ static RAMFUNC int ManchesterDecoding(int v)
                        Demod.sub = SUB_FIRST_HALF;
                        Demod.bitCount = 0;
                        Demod.shiftReg = 0;
-                       Demod.parityBits = 0;
                        Demod.samples = 0;
                        if(Demod.posCount) {
                                //if(trigger) LED_A_OFF();  // Not useful in this case...
@@ -450,7 +433,6 @@ static RAMFUNC int ManchesterDecoding(int v)
        else {
                modulation = bit & Demod.syncBit;
                modulation |= ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
-               //modulation = ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
 
                Demod.samples += 4;
 
@@ -485,8 +467,6 @@ static RAMFUNC int ManchesterDecoding(int v)
                                if(Demod.state == DEMOD_SOF_COMPLETE) {
                                        Demod.output[Demod.len] = 0x0f;
                                        Demod.len++;
-                                       Demod.parityBits <<= 1;
-                                       Demod.parityBits ^= OddByteParity[0x0f];
                                        Demod.state = DEMOD_UNSYNCD;
 //                                     error = 0x0f;
                                        return TRUE;
@@ -567,11 +547,9 @@ static RAMFUNC int ManchesterDecoding(int v)
                                        // Tag response does not need to be a complete byte!
                                        if(Demod.len > 0 || Demod.bitCount > 0) {
                                                if(Demod.bitCount > 1) {  // was > 0, do not interpret last closing bit, is part of EOF
-                                                       Demod.shiftReg >>= (9 - Demod.bitCount);
+                                                       Demod.shiftReg >>= (9 - Demod.bitCount);        // right align data
                                                        Demod.output[Demod.len] = Demod.shiftReg & 0xff;
                                                        Demod.len++;
-                                                       // No parity bit, so just shift a 0
-                                                       Demod.parityBits <<= 1;
                                                }
 
                                                Demod.state = DEMOD_UNSYNCD;
@@ -608,11 +586,6 @@ static RAMFUNC int ManchesterDecoding(int v)
                                Demod.shiftReg >>= 1;
                                Demod.output[Demod.len] = (Demod.shiftReg & 0xff);
                                Demod.len++;
-
-                               // FOR ISO15639 PARITY NOT SEND OTA, JUST CALCULATE IT FOR THE CLIENT
-                               Demod.parityBits <<= 1;
-                               Demod.parityBits ^= OddByteParity[(Demod.shiftReg & 0xff)];
-
                                Demod.bitCount = 0;
                                Demod.shiftReg = 0;
                        }
@@ -669,8 +642,8 @@ void RAMFUNC SnoopIClass(void)
        // So 32 should be enough!
        uint8_t *readerToTagCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
     // The response (tag -> reader) that we're receiving.
-       uint8_t *tagToReaderResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET);
-
+       uint8_t *tagToReaderResponse = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
+       
     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
  
     // reset traceLen to 0
@@ -769,10 +742,10 @@ void RAMFUNC SnoopIClass(void)
 
                        //if(!LogTrace(Uart.output,Uart.byteCnt, rsamples, Uart.parityBits,TRUE)) break;
                        //if(!LogTrace(NULL, 0, Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, 0, TRUE)) break;
-                       if(tracing)
-                       {
-                               LogTrace(Uart.output,Uart.byteCnt, (GetCountSspClk()-time_0) << 4, Uart.parityBits,TRUE);
-                               LogTrace(NULL, 0, (GetCountSspClk()-time_0) << 4, 0, TRUE);
+                       if(tracing)     {
+                               uint8_t parity[MAX_PARITY_SIZE];
+                               GetParity(Uart.output, Uart.byteCnt, parity);
+                               LogTrace(Uart.output,Uart.byteCnt, (GetCountSspClk()-time_0) << 4, (GetCountSspClk()-time_0) << 4, parity, TRUE);
                        }
 
 
@@ -793,10 +766,10 @@ void RAMFUNC SnoopIClass(void)
                    rsamples = samples - Demod.samples;
                    LED_B_ON();
 
-                       if(tracing)
-                       {
-                               LogTrace(Demod.output,Demod.len, (GetCountSspClk()-time_0) << 4 , Demod.parityBits,FALSE);
-                               LogTrace(NULL, 0, (GetCountSspClk()-time_0) << 4, 0, FALSE);
+                       if(tracing)     {
+                               uint8_t parity[MAX_PARITY_SIZE];
+                               GetParity(Demod.output, Demod.len, parity);
+                               LogTrace(Demod.output, Demod.len, (GetCountSspClk()-time_0) << 4, (GetCountSspClk()-time_0) << 4, parity, FALSE);
                        }
 
 
@@ -868,10 +841,7 @@ static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
         }
         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
             uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-                       /*if(OutOfNDecoding((b & 0xf0) >> 4)) {
-                               *len = Uart.byteCnt;
-                               return TRUE;
-                       }*/
+
                        if(OutOfNDecoding(b & 0x0f)) {
                                *len = Uart.byteCnt;
                                return TRUE;
@@ -994,7 +964,7 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
        {
 
                uint8_t mac_responses[64] = { 0 };
-               Dbprintf("Going into attack mode");
+               Dbprintf("Going into attack mode, %d CSNS sent", numberOfCSNS);
                // In this mode, a number of csns are within datain. We'll simulate each one, one at a time
                // in order to collect MAC's from the reader. This can later be used in an offlne-attack
                // in order to obtain the keys, as in the "dismantling iclass"-paper.
@@ -1004,7 +974,7 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
                        // The usb data is 512 bytes, fitting 65 8-byte CSNs in there.
 
                        memcpy(csn_crc, datain+(i*8), 8);
-                       if(doIClassSimulation(csn_crc,1,mac_responses))
+                       if(doIClassSimulation(csn_crc,1,mac_responses+i*8))
                        {
                                return; // Button pressed
                        }
@@ -1027,8 +997,6 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
  */
 int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf)
 {
-
-
        // CSN followed by two CRC bytes
        uint8_t response2[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
        uint8_t response3[] = { 0,0,0,0,0,0,0,0,0,0};
@@ -1079,7 +1047,7 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
 
        // + 1720..
        uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
-       memset(receivedCmd, 0x44, RECV_CMD_SIZE);
+       memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
        int len;
 
        // Prepare card messages
@@ -1169,16 +1137,16 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
                } else if(receivedCmd[0] == 0x05) {
                        // Reader random and reader MAC!!!
                        // Do not respond
-                       // We do not know what to answer, so lets keep quit
+            // We do not know what to answer, so lets keep quiet
                        resp = resp1; respLen = 0; //order = 5;
                        respdata = NULL;
                        respsize = 0;
                        if (breakAfterMacReceived){
-                               // TODO, actually return this to the caller instead of just
                                // dbprintf:ing ...
-                               Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x",csn[0],csn[1],csn[2],csn[3],csn[4],csn[5],csn[6],csn[7]);
+                               Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x"
+                                                  ,csn[0],csn[1],csn[2],csn[3],csn[4],csn[5],csn[6],csn[7]);
                                Dbprintf("RDR:  (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",len,
-                                                receivedCmd[0], receivedCmd[1], receivedCmd[2],
+                                               receivedCmd[0], receivedCmd[1], receivedCmd[2],
                                                receivedCmd[3], receivedCmd[4], receivedCmd[5],
                                                receivedCmd[6], receivedCmd[7], receivedCmd[8]);
                                if (reader_mac_buf != NULL)
@@ -1220,14 +1188,13 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
                }
 
                if (tracing) {
-                       LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, Uart.parityBits,TRUE);
-                       LogTrace(NULL,0, (r2t_time-time_0) << 4, 0,TRUE);
+                       uint8_t parity[MAX_PARITY_SIZE];
+                       GetParity(receivedCmd, len, parity);
+                       LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, (r2t_time-time_0) << 4, parity, TRUE);
 
                        if (respdata != NULL) {
-                               LogTrace(respdata,respsize, (t2r_time-time_0) << 4,SwapBits(GetParity(respdata,respsize),respsize),FALSE);
-                               LogTrace(NULL,0, (t2r_time-time_0) << 4,0,FALSE);
-
-
+                               GetParity(respdata, respsize, parity);
+                               LogTrace(respdata, respsize, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, FALSE);
                        }
                        if(!tracing) {
                                DbpString("Trace full");
@@ -1235,7 +1202,7 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
                        }
 
                }
-               memset(receivedCmd, 0x44, RECV_CMD_SIZE);
+               memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
        }
 
        //Dbprintf("%x", cmdsRecvd);
@@ -1296,20 +1263,23 @@ static void TransmitIClassCommand(const uint8_t *cmd, int len, int *samples, int
   FpgaSetupSsc();
 
    if (wait)
-    if(*wait < 10)
-      *wait = 10;
+   {
+     if(*wait < 10) *wait = 10;
+     
+     for(c = 0; c < *wait;) {
+       if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+         AT91C_BASE_SSC->SSC_THR = 0x00;               // For exact timing!
+         c++;
+       }
+       if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+         volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
+         (void)r;
+       }
+       WDT_HIT();
+     }
+
+   }
 
-  for(c = 0; c < *wait;) {
-    if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
-      AT91C_BASE_SSC->SSC_THR = 0x00;          // For exact timing!
-      c++;
-    }
-    if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-      volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
-      (void)r;
-    }
-    WDT_HIT();
-  }
 
   uint8_t sendbyte;
   bool firstpart = TRUE;
@@ -1389,21 +1359,23 @@ void CodeIClassCommand(const uint8_t * cmd, int len)
 
 void ReaderTransmitIClass(uint8_t* frame, int len)
 {
-  int wait = 0;
-  int samples = 0;
-  int par = 0;
-
-  // This is tied to other size changes
-  //   uint8_t* frame_addr = ((uint8_t*)BigBuf) + 2024;
-  CodeIClassCommand(frame,len);
-
-  // Select the card
-  TransmitIClassCommand(ToSend, ToSendMax, &samples, &wait);
-  if(trigger)
-       LED_A_ON();
-
-  // Store reader command in buffer
-  if (tracing) LogTrace(frame,len,rsamples,par,TRUE);
+       int wait = 0;
+       int samples = 0;
+
+       // This is tied to other size changes
+       CodeIClassCommand(frame,len);
+
+       // Select the card
+       TransmitIClassCommand(ToSend, ToSendMax, &samples, &wait);
+       if(trigger)
+               LED_A_ON();
+
+       // Store reader command in buffer
+       if (tracing) {
+               uint8_t par[MAX_PARITY_SIZE];
+               GetParity(frame, len, par);
+               LogTrace(frame, len, rsamples, rsamples, par, TRUE);
+       }
 }
 
 //-----------------------------------------------------------------------------
@@ -1445,10 +1417,7 @@ static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples,
                        b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                        skip = !skip;
                        if(skip) continue;
-                       /*if(ManchesterDecoding((b>>4) & 0xf)) {
-                               *samples = ((c - 1) << 3) + 4;
-                               return TRUE;
-                       }*/
+               
                        if(ManchesterDecoding(b & 0x0f)) {
                                *samples = c << 3;
                                return  TRUE;
@@ -1462,87 +1431,176 @@ int ReaderReceiveIClass(uint8_t* receivedAnswer)
   int samples = 0;
   if (!GetIClassAnswer(receivedAnswer,160,&samples,0)) return FALSE;
   rsamples += samples;
-  if (tracing) LogTrace(receivedAnswer,Demod.len,rsamples,Demod.parityBits,FALSE);
+  if (tracing) {
+       uint8_t parity[MAX_PARITY_SIZE];
+       GetParity(receivedAnswer, Demod.len, parity);
+       LogTrace(receivedAnswer,Demod.len,rsamples,rsamples,parity,FALSE);
+  }
   if(samples == 0) return FALSE;
   return Demod.len;
 }
 
-// Reader iClass Anticollission
-void ReaderIClass(uint8_t arg0) {
-       uint8_t act_all[]     = { 0x0a };
-       uint8_t identify[]    = { 0x0c };
-       uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+void setupIclassReader()
+{
+    FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+    // Reset trace buffer
+    iso14a_set_tracing(TRUE);
+    iso14a_clear_trace();
 
-       uint8_t* resp = (((uint8_t *)BigBuf) + 3560);   // was 3560 - tied to other size changes
+    // Setup SSC
+    FpgaSetupSsc();
+    // Start from off (no field generated)
+    // Signal field is off with the appropriate LED
+    LED_D_OFF();
+    FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+    SpinDelay(200);
 
-    FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+    SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
-       // Reset trace buffer
-       memset(trace, 0x44, RECV_CMD_OFFSET);
-       traceLen = 0;
+    // Now give it time to spin up.
+    // Signal field is on with the appropriate LED
+    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
+    SpinDelay(200);
+    LED_A_ON();
 
-       // Setup SSC
-       FpgaSetupSsc();
-       // Start from off (no field generated)
-       // Signal field is off with the appropriate LED
-       LED_D_OFF();
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       SpinDelay(200);
+}
 
-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+size_t sendCmdGetResponseWithRetries(uint8_t* command, size_t cmdsize, uint8_t* resp, uint8_t expected_size, uint8_t retries)
+{
+       while(retries-- > 0)
+       {
+               ReaderTransmitIClass(command, cmdsize);
+               if(expected_size == ReaderReceiveIClass(resp)){
+                       return 0;
+               }
+       }
+       return 1;//Error
+}
 
-       // Now give it time to spin up.
-       // Signal field is on with the appropriate LED
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-       SpinDelay(200);
+/**
+ * @brief Talks to an iclass tag, sends the commands to get CSN and CC.
+ * @param card_data where the CSN and CC are stored for return
+ * @return 0 = fail
+ *         1 = Got CSN
+ *         2 = Got CSN and CC
+ */
+uint8_t handshakeIclassTag(uint8_t *card_data)
+{
+       static uint8_t act_all[]     = { 0x0a };
+       static uint8_t identify[]    = { 0x0c };
+       static uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+       static uint8_t readcheck_cc[]= { 0x88, 0x02 };
+       uint8_t *resp = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
+
+       uint8_t read_status = 0;
+
+       // Send act_all
+       ReaderTransmitIClass(act_all, 1);
+       // Card present?
+       if(!ReaderReceiveIClass(resp)) return read_status;//Fail
+       //Send Identify
+       ReaderTransmitIClass(identify, 1);
+       //We expect a 10-byte response here, 8 byte anticollision-CSN and 2 byte CRC
+       uint8_t len  = ReaderReceiveIClass(resp);
+       if(len != 10) return read_status;//Fail
+
+       //Copy the Anti-collision CSN to our select-packet
+       memcpy(&select[1],resp,8);
+       //Select the card
+       ReaderTransmitIClass(select, sizeof(select));
+       //We expect a 10-byte response here, 8 byte CSN and 2 byte CRC
+       len  = ReaderReceiveIClass(resp);
+       if(len != 10) return read_status;//Fail
+
+       //Success - level 1, we got CSN
+       //Save CSN in response data
+       memcpy(card_data,resp,8);
+
+       //Flag that we got to at least stage 1, read CSN
+       read_status = 1;
+
+       // Card selected, now read e-purse (cc)
+       ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
+       if(ReaderReceiveIClass(resp) == 8) {
+               //Save CC (e-purse) in response data
+               memcpy(card_data+8,resp,8);
+
+               //Got both
+               read_status = 2;
+       }
 
-       LED_A_ON();
+       return read_status;
+}
 
-       for(;;) {
+// Reader iClass Anticollission
+void ReaderIClass(uint8_t arg0) {
+
+    uint8_t card_data[24]={0};
+    uint8_t last_csn[8]={0};
        
+    int read_status= 0;
+    bool abort_after_read = arg0 & FLAG_ICLASS_READER_ONLY_ONCE;
+       bool get_cc = arg0 & FLAG_ICLASS_READER_GET_CC;
+
+    setupIclassReader();
+
+    size_t datasize = 0;
+    while(!BUTTON_PRESS())
+    {
+
                if(traceLen > TRACE_SIZE) {
                        DbpString("Trace full");
                        break;
                }
-               
-               if (BUTTON_PRESS()) break;
+               WDT_HIT();
 
-               // Send act_all
-               ReaderTransmitIClass(act_all, 1);
-               // Card present?
-               if(ReaderReceiveIClass(resp)) {
-                       ReaderTransmitIClass(identify, 1);
-                       if(ReaderReceiveIClass(resp) == 10) {
-                               // Select card          
-                               memcpy(&select[1],resp,8);
-                               ReaderTransmitIClass(select, sizeof(select));
+               read_status = handshakeIclassTag(card_data);
 
-                               if(ReaderReceiveIClass(resp) == 10) {
-                                       Dbprintf("     Selected CSN: %02x %02x %02x %02x %02x %02x %02x %02x",
-                                       resp[0], resp[1], resp[2],
-                                       resp[3], resp[4], resp[5],
-                                       resp[6], resp[7]);
+               if(read_status == 0) continue;
+               if(read_status == 1) datasize = 8;
+               if(read_status == 2) datasize = 16;
+
+               LED_B_ON();
+               //Send back to client, but don't bother if we already sent this
+               if(memcmp(last_csn, card_data, 8) != 0)
+               {
+
+                       if(!get_cc || (get_cc && read_status == 2))
+                       {
+                               cmd_send(CMD_ACK,read_status,0,0,card_data,datasize);
+                               if(abort_after_read) {
+                                       LED_A_OFF();
+                                       return;
                                }
-                               // Card selected, whats next... ;-)
+                               //Save that we already sent this....
+                               memcpy(last_csn, card_data, 8);
                        }
+                       //If 'get_cc' was specified and we didn't get a CC, we'll just keep trying...
                }
-               WDT_HIT();
-       }
-       
-       LED_A_OFF();
+               LED_B_OFF();
+    }
+    cmd_send(CMD_ACK,0,0,0,card_data, 0);
+    LED_A_OFF();
 }
 
 void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
-       uint8_t act_all[]     = { 0x0a };
-       uint8_t identify[]    = { 0x0c };
-       uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
-       uint8_t readcheck_cc[]= { 0x88, 0x02 };
+
+       uint8_t card_data[USB_CMD_DATA_SIZE]={0};
+       uint16_t block_crc_LUT[255] = {0};
+
+       {//Generate a lookup table for block crc
+               for(int block = 0; block < 255; block++){
+                       char bl = block;
+                       block_crc_LUT[block] = iclass_crc16(&bl ,1);
+               }
+       }
+       //Dbprintf("Lookup table: %02x %02x %02x" ,block_crc_LUT[0],block_crc_LUT[1],block_crc_LUT[2]);
+
        uint8_t check[]       = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
        uint8_t read[]        = { 0x0c, 0x00, 0x00, 0x00 };
        
     uint16_t crc = 0;
        uint8_t cardsize=0;
-       bool read_success=false;
        uint8_t mem=0;
        
        static struct memory_t{
@@ -1553,223 +1611,114 @@ void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
          int keyaccess;
        } memory;
        
-       uint8_t* resp = (((uint8_t *)BigBuf) + 3560);   // was 3560 - tied to other size changes
-
-       // Reset trace buffer
-    memset(trace, 0x44, RECV_CMD_OFFSET);
-       traceLen = 0;
-
-       // Setup SSC
-       FpgaSetupSsc();
-       // Start from off (no field generated)
-       // Signal field is off with the appropriate LED
-       LED_D_OFF();
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       SpinDelay(200);
-
-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-
-       // Now give it time to spin up.
-       // Signal field is on with the appropriate LED
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-       SpinDelay(200);
+       uint8_t* resp = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
+       
+    setupIclassReader();
 
-       LED_A_ON();
 
-       for(int i=0;i<1;i++) {
+       while(!BUTTON_PRESS()) {
        
+               WDT_HIT();
+
                if(traceLen > TRACE_SIZE) {
                        DbpString("Trace full");
                        break;
                }
                
-               if (BUTTON_PRESS()) break;
-
-               // Send act_all
-               ReaderTransmitIClass(act_all, 1);
-               // Card present?
-               if(ReaderReceiveIClass(resp)) {
-                       ReaderTransmitIClass(identify, 1);
-                       if(ReaderReceiveIClass(resp) == 10) {
-                               // Select card          
-                               memcpy(&select[1],resp,8);
-                               ReaderTransmitIClass(select, sizeof(select));
+               uint8_t read_status = handshakeIclassTag(card_data);
+               if(read_status < 2) continue;
 
-                               if(ReaderReceiveIClass(resp) == 10) {
-                                       Dbprintf("     Selected CSN: %02x %02x %02x %02x %02x %02x %02x %02x",
-                                       resp[0], resp[1], resp[2],
-                                       resp[3], resp[4], resp[5],
-                                       resp[6], resp[7]);
-                               }
-                               // Card selected
-                               Dbprintf("Readcheck on Sector 2");
-                               ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
-                               if(ReaderReceiveIClass(resp) == 8) {
-                                  Dbprintf("     CC: %02x %02x %02x %02x %02x %02x %02x %02x",
-                                       resp[0], resp[1], resp[2],
-                                       resp[3], resp[4], resp[5],
-                                       resp[6], resp[7]);
-                               }else return;
-                               Dbprintf("Authenticate");
-                               //for now replay captured auth (as cc not updated)
-                               memcpy(check+5,MAC,4);
-                               Dbprintf("     AA: %02x %02x %02x %02x",
-                                       check[5], check[6], check[7],check[8]);
-                               ReaderTransmitIClass(check, sizeof(check));
-                               if(ReaderReceiveIClass(resp) == 4) {
-                                  Dbprintf("     AR: %02x %02x %02x %02x",
-                                       resp[0], resp[1], resp[2],resp[3]);
-                               }else {
-                                 Dbprintf("Error: Authentication Fail!");
-                                 return;
-                               }
-                               Dbprintf("Dump Contents");
-                               //first get configuration block
-                               read_success=false;
-                               read[1]=1;
-                               uint8_t *blockno=&read[1];
-                               crc = iclass_crc16((char *)blockno,1);
-                               read[2] = crc >> 8;
-                               read[3] = crc & 0xff;
-                               while(!read_success){
-                                     ReaderTransmitIClass(read, sizeof(read));
-                                     if(ReaderReceiveIClass(resp) == 10) {
-                                        read_success=true;
-                                        mem=resp[5];
-                                        memory.k16= (mem & 0x80);
-                                        memory.book= (mem & 0x20);
-                                        memory.k2= (mem & 0x8);
-                                        memory.lockauth= (mem & 0x2);
-                                        memory.keyaccess= (mem & 0x1);
+               //for now replay captured auth (as cc not updated)
+               memcpy(check+5,MAC,4);
 
-                                     }
-                               }
-                               if (memory.k16){
-                                 cardsize=255;
-                               }else cardsize=32;
-                               //then loop around remaining blocks
-                               for(uint8_t j=0; j<cardsize; j++){
-                                   read_success=false;
-                                   uint8_t *blockno=&j;
-                                   //crc_data[0]=j;
-                                   read[1]=j;
-                                   crc = iclass_crc16((char *)blockno,1);
-                                   read[2] = crc >> 8;
-                                   read[3] = crc & 0xff;
-                                   while(!read_success){
-                                     ReaderTransmitIClass(read, sizeof(read));
-                                     if(ReaderReceiveIClass(resp) == 10) {
-                                        read_success=true;
-                                        Dbprintf("     %02x: %02x %02x %02x %02x %02x %02x %02x %02x",
-                                         j, resp[0], resp[1], resp[2],
-                                         resp[3], resp[4], resp[5],
-                                         resp[6], resp[7]);
-                                     }
-                                   }
-                               }
-                       }
+               if(sendCmdGetResponseWithRetries(check, sizeof(check),resp, 4, 5))
+               {
+                       Dbprintf("Error: Authentication Fail!");
+                       continue;
                }
-               WDT_HIT();
-       }
-       
-       LED_A_OFF();
-}
-
-//1. Create Method to Read sectors/blocks 0,1,2 and Send to client
-void IClass_iso14443A_GetPublic(uint8_t arg0) {
-       uint8_t act_all[]     = { 0x0a };
-       uint8_t identify[]    = { 0x0c };
-       uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
-       uint8_t readcheck_cc[]= { 0x88, 0x02 }; 
-       //uint8_t read[]        = { 0x0c, 0x00, 0x00, 0x00 };   
-       uint8_t card_data[24]={0};
-       
-       //bool read_success=false;
-       uint8_t* resp = (((uint8_t *)BigBuf) + 3560);   // was 3560 - tied to other size changes
-
-       // Reset trace buffer
-    memset(trace, 0x44, RECV_CMD_OFFSET);
-       traceLen = 0;
-
-       // Setup SSC
-       FpgaSetupSsc();
-       // Start from off (no field generated)
-       // Signal field is off with the appropriate LED
-       LED_D_OFF();
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       SpinDelay(200);
-
-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-
-       // Now give it time to spin up.
-       // Signal field is on with the appropriate LED
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-       SpinDelay(200);
 
-       LED_A_ON();
+               //first get configuration block (block 1)
+               crc = block_crc_LUT[1];
+               read[1]=1;
+               read[2] = crc >> 8;
+               read[3] = crc & 0xff;
 
-       for(int i=0;i<1;i++) {
-       
-               if(traceLen > TRACE_SIZE) {
-                       DbpString("Trace full");
-                       break;
+               if(sendCmdGetResponseWithRetries(read, sizeof(read),resp, 10, 10))
+               {
+                       Dbprintf("Dump config (block 1) failed");
+                       continue;
                }
-               
-               if (BUTTON_PRESS()) break;
 
-               // Send act_all
-               ReaderTransmitIClass(act_all, 1);
-               // Card present?
-               if(ReaderReceiveIClass(resp)) {
-                       ReaderTransmitIClass(identify, 1);
-                       if(ReaderReceiveIClass(resp) == 10) {
-                               // Select card          
-                               memcpy(&select[1],resp,8);
-                               ReaderTransmitIClass(select, sizeof(select));
+               mem=resp[5];
+               memory.k16= (mem & 0x80);
+               memory.book= (mem & 0x20);
+               memory.k2= (mem & 0x8);
+               memory.lockauth= (mem & 0x2);
+               memory.keyaccess= (mem & 0x1);
 
-                               if(ReaderReceiveIClass(resp) == 10) {
-                                       Dbprintf("     Selected CSN: %02x %02x %02x %02x %02x %02x %02x %02x",
-                                       resp[0], resp[1], resp[2],
-                                       resp[3], resp[4], resp[5],
-                                       resp[6], resp[7]);
-                               }
-                               memcpy(card_data,resp,8);
-                               // Card selected
-                               Dbprintf("Readcheck on Sector 2");
-                               ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
-                               if(ReaderReceiveIClass(resp) == 8) {
-                                  Dbprintf("     CC: %02x %02x %02x %02x %02x %02x %02x %02x",
-                                       resp[0], resp[1], resp[2],
-                                       resp[3], resp[4], resp[5],
-                                       resp[6], resp[7]);
+               cardsize = memory.k16 ? 255 : 32;
+               WDT_HIT();
+               //Set card_data to all zeroes, we'll fill it with data
+               memset(card_data,0x0,USB_CMD_DATA_SIZE);
+               uint8_t failedRead =0;
+               uint8_t stored_data_length =0;
+               //then loop around remaining blocks
+               for(int block=0; block < cardsize; block++){
+
+                       read[1]= block;
+                       crc = block_crc_LUT[block];
+                       read[2] = crc >> 8;
+                       read[3] = crc & 0xff;
+
+                       if(!sendCmdGetResponseWithRetries(read, sizeof(read), resp, 10, 10))
+                       {
+                               Dbprintf("     %02x: %02x %02x %02x %02x %02x %02x %02x %02x",
+                                                block, resp[0], resp[1], resp[2],
+                                               resp[3], resp[4], resp[5],
+                                               resp[6], resp[7]);
+
+                               //Fill up the buffer
+                               memcpy(card_data+stored_data_length,resp,8);
+                               stored_data_length += 8;
+
+                               if(stored_data_length +8 > USB_CMD_DATA_SIZE)
+                               {//Time to send this off and start afresh
+                                       cmd_send(CMD_ACK,
+                                                        stored_data_length,//data length
+                                                        failedRead,//Failed blocks?
+                                                        0,//Not used ATM
+                                                        card_data, stored_data_length);
+                                       //reset
+                                       stored_data_length = 0;
+                                       failedRead = 0;
                                }
-                               memcpy(card_data+8,resp,8);
-                               //prep to read config block
-                               /*  read card configuration block
-                                 while(!read_success){
-                                 uint8_t sector_config=0x01;
-                                 memcpy(read+1,&sector_config,1);
-                                 ReaderTransmitIClass(read, sizeof(read));
-                                 if(ReaderReceiveIClass(resp) == 8) {
-                                   Dbprintf("     CC: %02x %02x %02x %02x %02x %02x %02x %02x",
-                                       resp[0], resp[1], resp[2],
-                                       resp[3], resp[4], resp[5],
-                                       resp[6], resp[7]);
-                                       read_success=true;
-                    memcpy(card_data+16,resp,8);
-                                 }
-                               }*/
+
+                       }else{
+                               failedRead = 1;
+                               stored_data_length +=8;//Otherwise, data becomes misaligned
+                               Dbprintf("Failed to dump block %d", block);
                        }
                }
-               WDT_HIT();
+               //Send off any remaining data
+               if(stored_data_length > 0)
+               {
+                       cmd_send(CMD_ACK,
+                                        stored_data_length,//data length
+                                        failedRead,//Failed blocks?
+                                        0,//Not used ATM
+                                        card_data, stored_data_length);
+               }
+               //If we got here, let's break
+               break;
        }
-       //Dbprintf("DEBUG: %02x%02x%02x%02x%02x%02x%02x%02x",card_data[0],card_data[1],card_data[2],card_data[3],card_data[4],card_data[5],card_data[6],card_data[7]);
-       //Dbprintf("DEBUG: %02x%02x%02x%02x%02x%02x%02x%02x",card_data[8],card_data[9],card_data[10],card_data[11],card_data[12],card_data[13],card_data[14],card_data[15]);
+       //Signal end of transmission
+       cmd_send(CMD_ACK,
+                        0,//data length
+                        0,//Failed blocks?
+                        0,//Not used ATM
+                        card_data, 0);
+
        LED_A_OFF();
-       LED_B_ON();
-       //send data back to the client
-    cmd_send(CMD_ACK,0,0,0,card_data,16);
-       LED_B_OFF();
 }
 
 //2. Create Read method (cut-down from above) based off responses from 1. 
@@ -1787,7 +1736,7 @@ void IClass_iso14443A_write(uint8_t arg0, uint8_t blockNo, uint8_t *data, uint8_
        
     uint16_t crc = 0;
        
-       uint8_t* resp = (((uint8_t *)BigBuf) + 3560);   // was 3560 - tied to other size changes
+       uint8_t* resp = (((uint8_t *)BigBuf) + 3560);
 
        // Reset trace buffer
     memset(trace, 0x44, RECV_CMD_OFFSET);
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