]> cvs.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/iclass.c
BigBuf and tracing rework: allow much longer traces in in hf commands
[proxmark3-svn] / armsrc / iclass.c
index 9971b670c93778bb48086e4dfe6a386467e676b8..4436602cf7e0bc9f068815b36dfaa7b0d79a0504 100644 (file)
 
 static int timeout = 4096;
 
-// CARD TO READER
-// Sequence D: 11110000 modulation with subcarrier during first half
-// Sequence E: 00001111 modulation with subcarrier during second half
-// Sequence F: 00000000 no modulation with subcarrier
-// READER TO CARD
-// Sequence X: 00001100 drop after half a period
-// Sequence Y: 00000000 no drop
-// Sequence Z: 11000000 drop at start
-#define        SEC_X 0x0c
-#define        SEC_Y 0x00
-#define        SEC_Z 0xc0
 
 static int SendIClassAnswer(uint8_t *resp, int respLen, int delay);
 
@@ -82,14 +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)
@@ -148,11 +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;
@@ -234,11 +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;
                                                }
@@ -257,11 +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;
@@ -322,7 +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;
@@ -364,7 +338,6 @@ static struct {
     int     bitCount;
     int     posCount;
        int     syncBit;
-       int     parityBits;
     uint16_t    shiftReg;
        int     buffer;
        int     buffer2;
@@ -378,7 +351,7 @@ static struct {
                SUB_SECOND_HALF,
                SUB_BOTH
        }               sub;
-    uint8_t   *output;
+    uint8_t *output;
 } Demod;
 
 static RAMFUNC int ManchesterDecoding(int v)
@@ -431,7 +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...
@@ -461,7 +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;
 
@@ -496,8 +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;
@@ -578,11 +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;
@@ -619,11 +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;
                        }
@@ -668,12 +630,7 @@ static RAMFUNC int ManchesterDecoding(int v)
 //-----------------------------------------------------------------------------
 void RAMFUNC SnoopIClass(void)
 {
-// DEFINED ABOVE
-// #define RECV_CMD_OFFSET   3032
-// #define RECV_RES_OFFSET   3096
-// #define DMA_BUFFER_OFFSET 3160
-// #define DMA_BUFFER_SIZE   4096
-// #define TRACE_SIZE        3000
+
 
     // We won't start recording the frames that we acquire until we trigger;
     // a good trigger condition to get started is probably when we see a
@@ -683,23 +640,25 @@ void RAMFUNC SnoopIClass(void)
     // The command (reader -> tag) that we're receiving.
        // The length of a received command will in most cases be no more than 18 bytes.
        // So 32 should be enough!
-    uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
+       #define ICLASS_BUFFER_SIZE 32
+       uint8_t readerToTagCmd[ICLASS_BUFFER_SIZE];
     // The response (tag -> reader) that we're receiving.
-    uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET);
-
-    // As we receive stuff, we copy it from receivedCmd or receivedResponse
-    // into trace, along with its length and other annotations.
-    //uint8_t *trace = (uint8_t *)BigBuf;
-    
-    // reset traceLen to 0
+       uint8_t tagToReaderResponse[ICLASS_BUFFER_SIZE];
+       
+    FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+       // free all BigBuf memory
+       BigBuf_free();
+    // The DMA buffer, used to stream samples from the FPGA
+    uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
+       // reset traceLen to 0
     iso14a_set_tracing(TRUE);
     iso14a_clear_trace();
     iso14a_set_trigger(FALSE);
 
-    // The DMA buffer, used to stream samples from the FPGA
-    int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
-    int lastRxCounter;
-    int8_t *upTo;
+       int lastRxCounter;
+    uint8_t *upTo;
     int smpl;
     int maxBehindBy = 0;
 
@@ -708,10 +667,8 @@ void RAMFUNC SnoopIClass(void)
     int samples = 0;
     rsamples = 0;
 
-    memset(trace, 0x44, RECV_CMD_OFFSET);
-
     // Set up the demodulator for tag -> reader responses.
-    Demod.output = receivedResponse;
+       Demod.output = tagToReaderResponse;
     Demod.len = 0;
     Demod.state = DEMOD_UNSYNCD;
 
@@ -723,7 +680,7 @@ void RAMFUNC SnoopIClass(void)
 
     // And the reader -> tag commands
     memset(&Uart, 0, sizeof(Uart));
-    Uart.output = receivedCmd;
+       Uart.output = readerToTagCmd;
     Uart.byteCntMax = 32; // was 100 (greg)////////////////////////////////////////////////////////////////////////
     Uart.state = STATE_UNSYNCD;
 
@@ -733,6 +690,10 @@ void RAMFUNC SnoopIClass(void)
     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
     SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
+       uint32_t time_0 = GetCountSspClk();
+       uint32_t time_start = 0;
+       uint32_t time_stop  = 0;
+
     int div = 0;
     //int div2 = 0;
     int decbyte = 0;
@@ -746,7 +707,7 @@ void RAMFUNC SnoopIClass(void)
                                 (DMA_BUFFER_SIZE-1);
         if(behindBy > maxBehindBy) {
             maxBehindBy = behindBy;
-            if(behindBy > 400) {
+            if(behindBy > (9 * DMA_BUFFER_SIZE / 10)) {
                 Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
                 goto done;
             }
@@ -766,20 +727,13 @@ void RAMFUNC SnoopIClass(void)
 
         //samples += 4;
        samples += 1;
-       //div2++;       
 
-       //if(div2 > 3) {
-               //div2 = 0;
-       //decbyte ^= ((smpl & 0x01) << (3 - div));
-       //decbyte ^= (((smpl & 0x01) | ((smpl & 0x02) >> 1)) << (3 - div)); // better already...
-       //decbyte ^= (((smpl & 0x01) | ((smpl & 0x02) >> 1) | ((smpl & 0x04) >> 2)) << (3 - div)); // even better...
        if(smpl & 0xF) {
                decbyte ^= (1 << (3 - div));
        }
-       //decbyte ^= (MajorityNibble[(smpl & 0x0F)] << (3 - div));
        
        // FOR READER SIDE COMMUMICATION...
-       //decbyte ^=  ((smpl & 0x10) << (3 - div));
+
        decbyter <<= 2;
        decbyter ^= (smpl & 0x30);
 
@@ -789,28 +743,27 @@ void RAMFUNC SnoopIClass(void)
                smpl = decbyter;        
                if(OutOfNDecoding((smpl & 0xF0) >> 4)) {
                    rsamples = samples - Uart.samples;
+                       time_stop = (GetCountSspClk()-time_0) << 4;
                    LED_C_ON();
-                   //if(triggered) {
-                       trace[traceLen++] = ((rsamples >>  0) & 0xff);
-                       trace[traceLen++] = ((rsamples >>  8) & 0xff);
-                       trace[traceLen++] = ((rsamples >> 16) & 0xff);
-                       trace[traceLen++] = ((rsamples >> 24) & 0xff);
-                       trace[traceLen++] = ((Uart.parityBits >>  0) & 0xff);
-                       trace[traceLen++] = ((Uart.parityBits >>  8) & 0xff);
-                       trace[traceLen++] = ((Uart.parityBits >> 16) & 0xff);
-                       trace[traceLen++] = ((Uart.parityBits >> 24) & 0xff);
-                       trace[traceLen++] = Uart.byteCnt;
-                       memcpy(trace+traceLen, receivedCmd, Uart.byteCnt);
-                       traceLen += Uart.byteCnt;
-                       if(traceLen > TRACE_SIZE) break;
-                   //}
-                   /* And ready to receive another command. */
+
+                       //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)     {
+                               uint8_t parity[MAX_PARITY_SIZE];
+                               GetParity(Uart.output, Uart.byteCnt, parity);
+                               LogTrace(Uart.output,Uart.byteCnt, time_start, time_stop, parity, TRUE);
+                       }
+
+
+                       /* And ready to receive another command. */
                    Uart.state = STATE_UNSYNCD;
                    /* And also reset the demod code, which might have been */
                    /* false-triggered by the commands from the reader. */
                    Demod.state = DEMOD_UNSYNCD;
                    LED_B_OFF();
                    Uart.byteCnt = 0;
+               }else{
+                       time_start = (GetCountSspClk()-time_0) << 4;
                }
                decbyter = 0;
        }
@@ -818,31 +771,24 @@ void RAMFUNC SnoopIClass(void)
        if(div > 3) {
                smpl = decbyte;
                if(ManchesterDecoding(smpl & 0x0F)) {
-                   rsamples = samples - Demod.samples;
+                       time_stop = (GetCountSspClk()-time_0) << 4;
+
+                       rsamples = samples - Demod.samples;
                    LED_B_ON();
 
-                   // timestamp, as a count of samples
-                   trace[traceLen++] = ((rsamples >>  0) & 0xff);
-                   trace[traceLen++] = ((rsamples >>  8) & 0xff);
-                   trace[traceLen++] = ((rsamples >> 16) & 0xff);
-                   trace[traceLen++] = 0x80 | ((rsamples >> 24) & 0xff);
-                   trace[traceLen++] = ((Demod.parityBits >>  0) & 0xff);
-                   trace[traceLen++] = ((Demod.parityBits >>  8) & 0xff);
-                   trace[traceLen++] = ((Demod.parityBits >> 16) & 0xff);
-                   trace[traceLen++] = ((Demod.parityBits >> 24) & 0xff);
-                   // length
-                   trace[traceLen++] = Demod.len;
-                   memcpy(trace+traceLen, receivedResponse, Demod.len);
-                   traceLen += Demod.len;
-                   if(traceLen > TRACE_SIZE) break;
-
-                   //triggered = TRUE;
+                       if(tracing)     {
+                               uint8_t parity[MAX_PARITY_SIZE];
+                               GetParity(Demod.output, Demod.len, parity);
+                               LogTrace(Demod.output, Demod.len, time_start, time_stop, parity, FALSE);
+                       }
 
                    // And ready to receive another response.
                    memset(&Demod, 0, sizeof(Demod));
-                   Demod.output = receivedResponse;
+                       Demod.output = tagToReaderResponse;
                    Demod.state = DEMOD_UNSYNCD;
                    LED_C_OFF();
+               }else{
+                       time_start = (GetCountSspClk()-time_0) << 4;
                }
                
                div = 0;
@@ -906,10 +852,7 @@ 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;
@@ -918,53 +861,93 @@ static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
     }
 }
 
+static uint8_t encode4Bits(const uint8_t b)
+{
+       uint8_t c = b & 0xF;
+       // OTA, the least significant bits first
+       //         The columns are
+       //               1 - Bit value to send
+       //               2 - Reversed (big-endian)
+       //               3 - Encoded
+       //               4 - Hex values
+
+       switch(c){
+       //                          1       2         3         4
+         case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55
+         case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95
+         case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65
+         case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5
+         case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59
+         case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99
+         case 9:  return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69
+         case 8:  return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9
+         case 7:  return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56
+         case 6:  return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96
+         case 5:  return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66
+         case 4:  return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6
+         case 3:  return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a
+         case 2:  return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a
+         case 1:  return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a
+         default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa
+
+       }
+}
 
 //-----------------------------------------------------------------------------
 // Prepare tag messages
 //-----------------------------------------------------------------------------
 static void CodeIClassTagAnswer(const uint8_t *cmd, int len)
 {
+
+       /*
+        * SOF comprises 3 parts;
+        * * An unmodulated time of 56.64 us
+        * * 24 pulses of 423.75 KHz (fc/32)
+        * * A logic 1, which starts with an unmodulated time of 18.88us
+        *   followed by 8 pulses of 423.75kHz (fc/32)
+        *
+        *
+        * EOF comprises 3 parts:
+        * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated
+        *   time of 18.88us.
+        * - 24 pulses of fc/32
+        * - An unmodulated time of 56.64 us
+        *
+        *
+        * A logic 0 starts with 8 pulses of fc/32
+        * followed by an unmodulated time of 256/fc (~18,88us).
+        *
+        * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by
+        * 8 pulses of fc/32 (also 18.88us)
+        *
+        * The mode FPGA_HF_SIMULATOR_MODULATE_424K_8BIT which we use to simulate tag,
+        * works like this.
+        * - A 1-bit input to the FPGA becomes 8 pulses on 423.5kHz (fc/32) (18.88us).
+        * - A 0-bit inptu to the FPGA becomes an unmodulated time of 18.88us
+        *
+        * In this mode the SOF can be written as 00011101 = 0x1D
+        * The EOF can be written as 10111000 = 0xb8
+        * A logic 1 is 01
+        * A logic 0 is 10
+        *
+        * */
+
        int i;
 
        ToSendReset();
 
        // Send SOF
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0xff;
-       ToSend[++ToSendMax] = 0xff;
-       ToSend[++ToSendMax] = 0xff;
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0xff;
+       ToSend[++ToSendMax] = 0x1D;
 
        for(i = 0; i < len; i++) {
-               int j;
                uint8_t b = cmd[i];
-
-               // Data bits
-               for(j = 0; j < 8; j++) {
-                       if(b & 1) {
-                               ToSend[++ToSendMax] = 0x00;
-                               ToSend[++ToSendMax] = 0xff;
-                       } else {
-                               ToSend[++ToSendMax] = 0xff;
-                               ToSend[++ToSendMax] = 0x00;
-                       }
-                       b >>= 1;
-               }
+               ToSend[++ToSendMax] = encode4Bits(b & 0xF); //Least significant half
+               ToSend[++ToSendMax] = encode4Bits((b >>4) & 0xF);//Most significant half
        }
 
        // Send EOF
-       ToSend[++ToSendMax] = 0xff;
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0xff;
-       ToSend[++ToSendMax] = 0xff;
-       ToSend[++ToSendMax] = 0xff;
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0x00;
-
+       ToSend[++ToSendMax] = 0xB8;
+       //lastProxToAirDuration  = 8*ToSendMax - 3*8 - 3*8;//Not counting zeroes in the beginning or end
        // Convert from last byte pos to length
        ToSendMax++;
 }
@@ -972,48 +955,98 @@ static void CodeIClassTagAnswer(const uint8_t *cmd, int len)
 // Only SOF 
 static void CodeIClassTagSOF()
 {
-       ToSendReset();
+       //So far a dummy implementation, not used
+       //int lastProxToAirDuration =0;
 
+       ToSendReset();
        // Send SOF
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0xff;
-       ToSend[++ToSendMax] = 0xff;
-       ToSend[++ToSendMax] = 0xff;
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0xff;
-       
+       ToSend[++ToSendMax] = 0x1D;
+//     lastProxToAirDuration  = 8*ToSendMax - 3*8;//Not counting zeroes in the beginning
+
        // Convert from last byte pos to length
        ToSendMax++;
 }
 
-//-----------------------------------------------------------------------------
-// Simulate iClass Card
-// Only CSN (Card Serial Number)
-// 
-//-----------------------------------------------------------------------------
-void SimulateIClass(uint8_t arg0, uint8_t *datain)
+int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf);
+/**
+ * @brief SimulateIClass simulates an iClass card.
+ * @param arg0 type of simulation
+ *                     - 0 uses the first 8 bytes in usb data as CSN
+ *                     - 2 "dismantling iclass"-attack. This mode iterates through all CSN's specified
+ *                     in the usb data. This mode collects MAC from the reader, in order to do an offline
+ *                     attack on the keys. For more info, see "dismantling iclass" and proxclone.com.
+ *                     - Other : Uses the default CSN (031fec8af7ff12e0)
+ * @param arg1 - number of CSN's contained in datain (applicable for mode 2 only)
+ * @param arg2
+ * @param datain
+ */
+void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain)
 {
-       uint8_t simType = arg0;
+       uint32_t simType = arg0;
+       uint32_t numberOfCSNS = arg1;
+       FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 
-  // Enable and clear the trace
-       tracing = TRUE;
-       traceLen = 0;
-  memset(trace, 0x44, TRACE_SIZE);
+       // Enable and clear the trace
+       iso14a_set_tracing(TRUE);
+       iso14a_clear_trace();
+
+       uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
+       if(simType == 0) {
+               // Use the CSN from commandline
+               memcpy(csn_crc, datain, 8);
+               doIClassSimulation(csn_crc,0,NULL);
+       }else if(simType == 1)
+       {
+               doIClassSimulation(csn_crc,0,NULL);
+       }
+       else if(simType == 2)
+       {
+
+               uint8_t mac_responses[USB_CMD_DATA_SIZE] = { 0 };
+               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.
+               int i = 0;
+               for( ; i < numberOfCSNS && i*8+8 < USB_CMD_DATA_SIZE; i++)
+               {
+                       // 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+i*8))
+                       {
+                               cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);
+                               return; // Button pressed
+                       }
+               }
+               cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);
+
+       }
+       else{
+               // We may want a mode here where we hardcode the csns to use (from proxclone).
+               // That will speed things up a little, but not required just yet.
+               Dbprintf("The mode is not implemented, reserved for future use");
+       }
+       Dbprintf("Done...");
+
+}
+/**
+ * @brief Does the actual simulation
+ * @param csn - csn to use
+ * @param breakAfterMacReceived if true, returns after reader MAC has been received.
+ */
+int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf)
+{
 
        // CSN followed by two CRC bytes
+       uint8_t response1[] = { 0x0F} ;
        uint8_t response2[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
-       uint8_t response3[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
-
+       uint8_t response3[] = { 0,0,0,0,0,0,0,0,0,0};
+       memcpy(response3,csn,sizeof(response3));
+       Dbprintf("Simulating 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]);
        // e-Purse
        uint8_t response4[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 
-       if(simType == 0) {
-               // Use the CSN from commandline
-               memcpy(response3, datain, 8);
-       }
-
        // Construct anticollision-CSN
        rotateCSN(response3,response2);
 
@@ -1021,6 +1054,7 @@ void SimulateIClass(uint8_t arg0, uint8_t *datain)
        ComputeCrc14443(CRC_ICLASS, response2, 8, &response2[8], &response2[9]);
        ComputeCrc14443(CRC_ICLASS, response3, 8, &response3[8], &response3[9]);
 
+       int exitLoop = 0;
        // Reader 0a
        // Tag    0f
        // Reader 0c
@@ -1028,34 +1062,35 @@ void SimulateIClass(uint8_t arg0, uint8_t *datain)
        // Reader 81 anticoll. CSN
        // Tag    CSN
 
-       uint8_t *resp;
-       int respLen;
-       uint8_t* respdata = NULL;
-       int respsize = 0;
-       uint8_t sof = 0x0f;
+       uint8_t *modulated_response;
+       int modulated_response_size;
+       uint8_t* trace_data = NULL;
+       int trace_data_size = 0;
+       //uint8_t sof = 0x0f;
 
-       // Respond SOF -- takes 8 bytes
-       uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
+       // free eventually allocated BigBuf memory
+       BigBuf_free();
+       // Respond SOF -- takes 1 bytes
+       uint8_t *resp1 = BigBuf_malloc(2);
        int resp1Len;
 
        // Anticollision CSN (rotated CSN)
-       // 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit)
-       uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 10);
+       // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
+       uint8_t *resp2 = BigBuf_malloc(28);
        int resp2Len;
 
        // CSN
-       // 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit)
-       uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 190);
+       // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
+       uint8_t *resp3 = BigBuf_malloc(30);
        int resp3Len;
 
        // e-Purse
        // 144: Takes 16 bytes for SOF/EOF and 8 * 16 = 128 bytes (2 bytes/bit)
-       uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 370);
+       uint8_t *resp4 = BigBuf_malloc(150);
        int resp4Len;
 
-       // + 1720..
-  uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
-       memset(receivedCmd, 0x44, RECV_CMD_SIZE);
+       uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
+       memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
        int len;
 
        // Prepare card messages
@@ -1077,74 +1112,94 @@ void SimulateIClass(uint8_t arg0, uint8_t *datain)
        CodeIClassTagAnswer(response4, sizeof(response4));
        memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax;
 
+
+       // Start from off (no field generated)
+       //FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       //SpinDelay(200);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
+       SpinDelay(100);
+       StartCountSspClk();
        // We need to listen to the high-frequency, peak-detected path.
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
        FpgaSetupSsc();
 
        // To control where we are in the protocol
        int cmdsRecvd = 0;
+       uint32_t time_0 = GetCountSspClk();
+       uint32_t t2r_time =0;
+       uint32_t r2t_time =0;
 
        LED_A_ON();
-       for(;;) {
+       bool buttonPressed = false;
+
+       while(!exitLoop) {
+
                LED_B_OFF();
+               //Signal tracer
+               // Can be used to get a trigger for an oscilloscope..
+               LED_C_OFF();
+
                if(!GetIClassCommandFromReader(receivedCmd, &len, 100)) {
-                       DbpString("button press");
+                       buttonPressed = true;
                        break;
                }
+               r2t_time = GetCountSspClk();
+               //Signal tracer
+               LED_C_ON();
 
                // Okay, look at the command now.
-               if(receivedCmd[0] == 0x0a) {
+               if(receivedCmd[0] == 0x0a ) {
                        // Reader in anticollission phase
-                       resp = resp1; respLen = resp1Len; //order = 1;
-                       respdata = &sof;
-                       respsize = sizeof(sof);
-                       //resp = resp2; respLen = resp2Len; order = 2;
-                       //DbpString("Hello request from reader:");
+                       modulated_response = resp1; modulated_response_size = resp1Len; //order = 1;
+                       trace_data = response1;
+                       trace_data_size = sizeof(response1);
                } else if(receivedCmd[0] == 0x0c) {
                        // Reader asks for anticollission CSN
-                       resp = resp2; respLen = resp2Len; //order = 2;
-                       respdata = response2;
-                       respsize = sizeof(response2);
+                       modulated_response = resp2; modulated_response_size = resp2Len; //order = 2;
+                       trace_data = response2;
+                       trace_data_size = sizeof(response2);
                        //DbpString("Reader requests anticollission CSN:");
                } else if(receivedCmd[0] == 0x81) {
                        // Reader selects anticollission CSN.
                        // Tag sends the corresponding real CSN
-                       resp = resp3; respLen = resp3Len; //order = 3;
-                       respdata = response3;
-                       respsize = sizeof(response3);
+                       modulated_response = resp3; modulated_response_size = resp3Len; //order = 3;
+                       trace_data = response3;
+                       trace_data_size = sizeof(response3);
                        //DbpString("Reader selects anticollission CSN:");
                } else if(receivedCmd[0] == 0x88) {
                        // Read e-purse (88 02)
-                       resp = resp4; respLen = resp4Len; //order = 4;
-                       respdata = response4;
-                       respsize = sizeof(response4);
+                       modulated_response = resp4; modulated_response_size = resp4Len; //order = 4;
+                       trace_data = response4;
+                       trace_data_size = sizeof(response4);
                        LED_B_ON();
                } else if(receivedCmd[0] == 0x05) {
                        // Reader random and reader MAC!!!
-                       // Lets store this ;-)
-/*
-                       Dbprintf("                CSN: %02x %02x %02x %02x %02x %02x %02x %02x",
-                       response3[0], response3[1], response3[2],
-                       response3[3], response3[4], response3[5],
-                       response3[6], response3[7]);
-*/                     
-                       Dbprintf("READER AUTH (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",
-                       len,
-                       receivedCmd[0], receivedCmd[1], receivedCmd[2],
-                       receivedCmd[3], receivedCmd[4], receivedCmd[5],
-                       receivedCmd[6], receivedCmd[7], receivedCmd[8]);
-
                        // Do not respond
-                       // We do not know what to answer, so lets keep quit
-                       resp = resp1; respLen = 0; //order = 5;
-                       respdata = NULL;
-                       respsize = 0;
+            // We do not know what to answer, so lets keep quiet
+                       modulated_response = resp1; modulated_response_size = 0; //order = 5;
+                       trace_data = NULL;
+                       trace_data_size = 0;
+                       if (breakAfterMacReceived){
+                               // 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("RDR:  (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",len,
+                                               receivedCmd[0], receivedCmd[1], receivedCmd[2],
+                                               receivedCmd[3], receivedCmd[4], receivedCmd[5],
+                                               receivedCmd[6], receivedCmd[7], receivedCmd[8]);
+                               if (reader_mac_buf != NULL)
+                               {
+                                       memcpy(reader_mac_buf,receivedCmd+1,8);
+                               }
+                               exitLoop = true;
+                       }
                } else if(receivedCmd[0] == 0x00 && len == 1) {
                        // Reader ends the session
-                       resp = resp1; respLen = 0; //order = 0;
-                       respdata = NULL;
-                       respsize = 0;
+                       modulated_response = resp1; modulated_response_size = 0; //order = 0;
+                       trace_data = NULL;
+                       trace_data_size = 0;
                } else {
+                       //#db# Unknown command received from reader (len=5): 26 1 0 f6 a 44 44 44 44
                        // Never seen this command before
                        Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x",
                        len,
@@ -1152,79 +1207,88 @@ void SimulateIClass(uint8_t arg0, uint8_t *datain)
                        receivedCmd[3], receivedCmd[4], receivedCmd[5],
                        receivedCmd[6], receivedCmd[7], receivedCmd[8]);
                        // Do not respond
-                       resp = resp1; respLen = 0; //order = 0;
-                       respdata = NULL;
-                       respsize = 0;
+                       modulated_response = resp1; modulated_response_size = 0; //order = 0;
+                       trace_data = NULL;
+                       trace_data_size = 0;
                }
 
-               if(cmdsRecvd > 999) {
-                       DbpString("1000 commands later...");
-                       break;
+               if(cmdsRecvd >  100) {
+                       //DbpString("100 commands later...");
+                       //break;
                }
                else {
                        cmdsRecvd++;
                }
-
-               if(respLen > 0) {
-                       SendIClassAnswer(resp, respLen, 21);
+               /**
+               A legit tag has about 380us delay between reader EOT and tag SOF.
+               **/
+               if(modulated_response_size > 0) {
+                       SendIClassAnswer(modulated_response, modulated_response_size, 1);
+                       t2r_time = GetCountSspClk();
                }
-               
+
                if (tracing) {
-                       LogTrace(receivedCmd,len, rsamples, Uart.parityBits, TRUE);
-                       if (respdata != NULL) {
-                               LogTrace(respdata,respsize, rsamples, SwapBits(GetParity(respdata,respsize),respsize), FALSE);
+                       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 (trace_data != NULL) {
+                               GetParity(trace_data, trace_data_size, parity);
+                               LogTrace(trace_data, trace_data_size, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, FALSE);
                        }
-                       if(traceLen > TRACE_SIZE) {
+                       if(!tracing) {
                                DbpString("Trace full");
-                               break;
+                               //break;
                        }
-               }
 
-               memset(receivedCmd, 0x44, RECV_CMD_SIZE);
+               }
+               memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
        }
 
-       Dbprintf("%x", cmdsRecvd);
+       //Dbprintf("%x", cmdsRecvd);
        LED_A_OFF();
        LED_B_OFF();
+       LED_C_OFF();
+
+       if(buttonPressed)
+       {
+               DbpString("Button pressed");
+       }
+       return buttonPressed;
 }
 
 static int SendIClassAnswer(uint8_t *resp, int respLen, int delay)
 {
-       int i = 0, u = 0, d = 0;
+       int i = 0, d=0;//, u = 0, d = 0;
        uint8_t b = 0;
-       // return 0;
-       // Modulate Manchester
-       // FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD424);
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD);
+
+       //FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K_8BIT);
+
        AT91C_BASE_SSC->SSC_THR = 0x00;
        FpgaSetupSsc();
-       
-       // send cycle
-       for(;;) {
-               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-                       volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-                       (void)b;
+       while(!BUTTON_PRESS()) {
+               if((AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)){
+                       b = AT91C_BASE_SSC->SSC_RHR; (void) b;
                }
-               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)){
+                       b = 0x00;
                        if(d < delay) {
-                               b = 0x00;
                                d++;
                        }
-                       else if(i >= respLen) {
-                               b = 0x00;
-                               u++;
-                       } else {
-                               b = resp[i];
-                               u++;
-                               if(u > 1) { i++; u = 0; }
+                       else {
+                               if( i < respLen){
+                                       b = resp[i];
+                                       //Hack
+                                       //b = 0xAC;
+                               }
+                               i++;
                        }
                        AT91C_BASE_SSC->SSC_THR = b;
-
-                       if(u > 4) break;
-               }
-               if(BUTTON_PRESS()) {
-                       break;
                }
+
+//             if (i > respLen +4) break;
+               if (i > respLen +1) break;
        }
 
        return 0;
@@ -1238,26 +1302,28 @@ static int SendIClassAnswer(uint8_t *resp, int respLen, int delay)
 static void TransmitIClassCommand(const uint8_t *cmd, int len, int *samples, int *wait)
 {
   int c;
-
   FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
   AT91C_BASE_SSC->SSC_THR = 0x00;
   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;
@@ -1314,12 +1380,12 @@ void CodeIClassCommand(const uint8_t * cmd, int len)
     b = cmd[i];
     for(j = 0; j < 4; j++) {
       for(k = 0; k < 4; k++) {
-       if(k == (b & 3)) {
-           ToSend[++ToSendMax] = 0x0f;
-       }
-       else {
-           ToSend[++ToSendMax] = 0x00;
-       }
+                       if(k == (b & 3)) {
+                               ToSend[++ToSendMax] = 0x0f;
+                       }
+                       else {
+                               ToSend[++ToSendMax] = 0x00;
+                       }
       }
       b >>= 2;
     }
@@ -1337,21 +1403,23 @@ 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);
+       }
 }
 
 //-----------------------------------------------------------------------------
@@ -1393,10 +1461,7 @@ 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;
@@ -1410,85 +1475,176 @@ 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);
 
-       // Reset trace buffer
-       memset(trace, 0x44, RECV_CMD_OFFSET);
-       traceLen = 0;
+    SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
-       // 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);
+    // 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();
 
-       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);
+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
+}
 
-       LED_A_ON();
+/**
+ * @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[ICLASS_BUFFER_SIZE];
+
+       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;
+       }
 
-       for(;;) {
+       return read_status;
+}
+
+// Reader iClass Anticollission
+void ReaderIClass(uint8_t arg0) {
+
+    uint8_t card_data[24]={0};
+    uint8_t last_csn[8]={0};
        
-               if(traceLen > TRACE_SIZE) {
+    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 > BigBuf_max_traceLen()) {
                        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{
@@ -1499,223 +1655,114 @@ 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);
+       uint8_t resp[ICLASS_BUFFER_SIZE];
+       
+    setupIclassReader();
 
-       // 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();
-
-       for(int i=0;i<1;i++) {
+       while(!BUTTON_PRESS()) {
        
-               if(traceLen > TRACE_SIZE) {
+               WDT_HIT();
+
+               if(traceLen > BigBuf_max_traceLen()) {
                        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;
+               //first get configuration block (block 1)
+               crc = block_crc_LUT[1];
+               read[1]=1;
+               read[2] = crc >> 8;
+               read[3] = crc & 0xff;
 
-       // 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();
-
-       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. 
@@ -1733,7 +1780,7 @@ 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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