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[proxmark3-svn] / armsrc / iclass.c

diff --git a/armsrc/iclass.c b/armsrc/iclass.c
index e4b1a48854d68cc083cd381e294748f6d8b2db0b..7ffac62d5cd3f296739c3e07663d0871f6c4081c 100644 (file)
--- a/armsrc/iclass.c
+++ b/armsrc/iclass.c
@@ -41,40 +41,20 @@
 #include "util.h"
 #include "string.h"
 #include "common.h"
 #include "util.h"
 #include "string.h"
 #include "common.h"

+#include "cmd.h"
+#include "iso14443a.h"

 // Needed for CRC in emulation mode;
 // same construction as in ISO 14443;
 // different initial value (CRC_ICLASS)
 #include "iso14443crc.h"
 // Needed for CRC in emulation mode;
 // same construction as in ISO 14443;
 // different initial value (CRC_ICLASS)
 #include "iso14443crc.h"

+#include "iso15693tools.h"
+#include "protocols.h"
+#include "optimized_cipher.h"
+#include "usb_cdc.h" // for usb_poll_validate_length
+#include "fpgaloader.h"

 
 static int timeout = 4096;
 
 
 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
-
-// SAME AS IN iso14443a.
-#define RECV_CMD_OFFSET   3032
-#define RECV_RES_OFFSET   3096
-#define DMA_BUFFER_OFFSET 3160
-#define DMA_BUFFER_SIZE   4096
-#define TRACE_LENGTH      3000
-
-uint32_t SwapBits(uint32_t value, int nrbits) {
-       int i;
-       uint32_t newvalue = 0;
-       for(i = 0; i < nrbits; i++) {
-               newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
-       }
-       return newvalue;
-}

 
 static int SendIClassAnswer(uint8_t *resp, int respLen, int delay);
 
 
 static int SendIClassAnswer(uint8_t *resp, int respLen, int delay);
 


@@ -96,14 +76,13 @@ static struct {
     int     nOutOfCnt;
     int     OutOfCnt;
     int     syncBit;
     int     nOutOfCnt;
     int     OutOfCnt;
     int     syncBit;

-    int     parityBits;

     int     samples;
     int     highCnt;
     int     swapper;
     int     counter;
     int     bitBuffer;
     int     dropPosition;
     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)
 } Uart;
 
 static RAMFUNC int OutOfNDecoding(int bit)


@@ -113,7 +92,7 @@ static RAMFUNC int OutOfNDecoding(int bit)
 
        if(!Uart.bitBuffer) {
                Uart.bitBuffer = bit ^ 0xFF0;
 
        if(!Uart.bitBuffer) {
                Uart.bitBuffer = bit ^ 0xFF0;

-               return FALSE;
+               return false;

        }
        else {
                Uart.bitBuffer <<= 4;
        }
        else {
                Uart.bitBuffer <<= 4;


@@ -124,7 +103,7 @@ static RAMFUNC int OutOfNDecoding(int bit)
                Uart.output[Uart.byteCnt] = Uart.bitBuffer & 0xFF;
                Uart.byteCnt++;
                Uart.swapper = 0;
                Uart.output[Uart.byteCnt] = Uart.bitBuffer & 0xFF;
                Uart.byteCnt++;
                Uart.swapper = 0;

-               if(Uart.byteCnt > 15) { return TRUE; }
+               if(Uart.byteCnt > 15) { return true; }

        }
        else {
                Uart.swapper = 1;
        }
        else {
                Uart.swapper = 1;


@@ -161,15 +140,12 @@ static RAMFUNC int OutOfNDecoding(int bit)
                                        Uart.highCnt = 0;
                                        if(Uart.byteCnt == 0) {
                                                // Its not straightforward to show single EOFs
                                        Uart.highCnt = 0;
                                        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;
+                                               // So just leave it and do not return true
+                                               Uart.output[0] = 0xf0;

                                                Uart.byteCnt++;
                                                Uart.byteCnt++;

-
-                                               // Calculate the parity bit for the client...
-                                               Uart.parityBits = 1;

                                        }
                                        else {
                                        }
                                        else {

-                                               return TRUE;
+                                               return true;

                                        }
                                }
                                else if(Uart.state != STATE_START_OF_COMMUNICATION) {
                                        }
                                }
                                else if(Uart.state != STATE_START_OF_COMMUNICATION) {


@@ -248,11 +224,6 @@ static RAMFUNC int OutOfNDecoding(int bit)
                                                if(Uart.bitCnt == 8) {
                                                        Uart.output[Uart.byteCnt] = (Uart.shiftReg & 0xff);
                                                        Uart.byteCnt++;
                                                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;
                                                }
                                                        Uart.bitCnt = 0;
                                                        Uart.shiftReg = 0;
                                                }


@@ -271,11 +242,6 @@ static RAMFUNC int OutOfNDecoding(int bit)
                                        Uart.dropPosition--;
                                        Uart.output[Uart.byteCnt] = (Uart.dropPosition & 0xff);
                                        Uart.byteCnt++;
                                        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;
                                        Uart.bitCnt = 0;
                                        Uart.shiftReg = 0;
                                        Uart.nOutOfCnt = 0;


@@ -298,7 +264,7 @@ static RAMFUNC int OutOfNDecoding(int bit)
                                Uart.byteCnt++;
                                Uart.output[Uart.byteCnt] = 0xAA;
                                Uart.byteCnt++;
                                Uart.byteCnt++;
                                Uart.output[Uart.byteCnt] = 0xAA;
                                Uart.byteCnt++;

-                               return TRUE;
+                               return true;

                        }*/
                }
 
                        }*/
                }
 


@@ -336,7 +302,6 @@ static RAMFUNC int OutOfNDecoding(int bit)
                                Uart.state = STATE_START_OF_COMMUNICATION;
                                Uart.bitCnt = 0;
                                Uart.byteCnt = 0;
                                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;
                                Uart.nOutOfCnt = 0;
                                Uart.OutOfCnt = 4; // Start at 1/4, could switch to 1/256
                                Uart.dropPosition = 0;


@@ -354,7 +319,7 @@ static RAMFUNC int OutOfNDecoding(int bit)
                }
        }
 
                }
        }
 

-    return FALSE;
+    return false;

 }
 
 //=============================================================================
 }
 
 //=============================================================================


@@ -378,7 +343,6 @@ static struct {
     int     bitCount;
     int     posCount;
        int     syncBit;
     int     bitCount;
     int     posCount;
        int     syncBit;

-       int     parityBits;

     uint16_t    shiftReg;
        int     buffer;
        int     buffer2;
     uint16_t    shiftReg;
        int     buffer;
        int     buffer2;


@@ -392,7 +356,7 @@ static struct {
                SUB_SECOND_HALF,
                SUB_BOTH
        }               sub;
                SUB_SECOND_HALF,
                SUB_BOTH
        }               sub;

-    uint8_t   *output;
+    uint8_t *output;

 } Demod;
 
 static RAMFUNC int ManchesterDecoding(int v)
 } Demod;
 
 static RAMFUNC int ManchesterDecoding(int v)


@@ -408,7 +372,7 @@ static RAMFUNC int ManchesterDecoding(int v)
 
        if(Demod.buff < 3) {
                Demod.buff++;
 
        if(Demod.buff < 3) {
                Demod.buff++;

-               return FALSE;
+               return false;

        }
 
        if(Demod.state==DEMOD_UNSYNCD) {
        }
 
        if(Demod.state==DEMOD_UNSYNCD) {


@@ -445,7 +409,6 @@ static RAMFUNC int ManchesterDecoding(int v)
                        Demod.sub = SUB_FIRST_HALF;
                        Demod.bitCount = 0;
                        Demod.shiftReg = 0;
                        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...
                        Demod.samples = 0;
                        if(Demod.posCount) {
                                //if(trigger) LED_A_OFF();  // Not useful in this case...


@@ -475,7 +438,6 @@ static RAMFUNC int ManchesterDecoding(int v)
        else {
                modulation = bit & Demod.syncBit;
                modulation |= ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
        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;
 
 
                Demod.samples += 4;
 


@@ -510,11 +472,9 @@ static RAMFUNC int ManchesterDecoding(int v)
                                if(Demod.state == DEMOD_SOF_COMPLETE) {
                                        Demod.output[Demod.len] = 0x0f;
                                        Demod.len++;
                                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;
                                        Demod.state = DEMOD_UNSYNCD;
 //                                     error = 0x0f;

-                                       return TRUE;
+                                       return true;

                                }
                                else {
                                        Demod.state = DEMOD_ERROR_WAIT;
                                }
                                else {
                                        Demod.state = DEMOD_ERROR_WAIT;


@@ -592,15 +552,13 @@ 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
                                        // 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++;
                                                        Demod.output[Demod.len] = Demod.shiftReg & 0xff;
                                                        Demod.len++;

-                                                       // No parity bit, so just shift a 0
-                                                       Demod.parityBits <<= 1;

                                                }
 
                                                Demod.state = DEMOD_UNSYNCD;
                                                }
 
                                                Demod.state = DEMOD_UNSYNCD;

-                                               return TRUE;
+                                               return true;

                                        }
                                        else {
                                                Demod.output[Demod.len] = 0xad;
                                        }
                                        else {
                                                Demod.output[Demod.len] = 0xad;


@@ -633,11 +591,6 @@ static RAMFUNC int ManchesterDecoding(int v)
                                Demod.shiftReg >>= 1;
                                Demod.output[Demod.len] = (Demod.shiftReg & 0xff);
                                Demod.len++;
                                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;
                        }
                                Demod.bitCount = 0;
                                Demod.shiftReg = 0;
                        }


@@ -660,14 +613,14 @@ static RAMFUNC int ManchesterDecoding(int v)
                                Demod.len++;
                                Demod.output[Demod.len] = 0xBB;
                                Demod.len++;
                                Demod.len++;
                                Demod.output[Demod.len] = 0xBB;
                                Demod.len++;

-                               return TRUE;
+                               return true;

                        }
 
                }
 
        } // end (state != UNSYNCED)
 
                        }
 
                }
 
        } // end (state != UNSYNCED)
 

-    return FALSE;
+    return false;

 }
 
 //=============================================================================
 }
 
 //=============================================================================


@@ -682,38 +635,34 @@ static RAMFUNC int ManchesterDecoding(int v)
 //-----------------------------------------------------------------------------
 void RAMFUNC SnoopIClass(void)
 {
 //-----------------------------------------------------------------------------
 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_LENGTH      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
     // response from the tag.
 
     // 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
     // response from the tag.

-    //int triggered = FALSE; // FALSE to wait first for card
+    //int triggered = false; // false to wait first for card

 
     // 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!
 
     // 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.
     // 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
-    iso14a_set_tracing(TRUE);
-    iso14a_clear_tracelen();
-    iso14a_set_trigger(FALSE);
-
+       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
     // The DMA buffer, used to stream samples from the FPGA

-    int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
-    int lastRxCounter;
-    int8_t *upTo;
+    uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
+ 
+       set_tracing(true);
+       clear_trace();
+    iso14a_set_trigger(false);
+
+       int lastRxCounter;
+    uint8_t *upTo;

     int smpl;
     int maxBehindBy = 0;
 
     int smpl;
     int maxBehindBy = 0;
 


@@ -722,22 +671,20 @@ void RAMFUNC SnoopIClass(void)
     int samples = 0;
     rsamples = 0;
 
     int samples = 0;
     rsamples = 0;
 

-    memset(trace, 0x44, RECV_CMD_OFFSET);
-

     // Set up the demodulator for tag -> reader responses.
     // Set up the demodulator for tag -> reader responses.

-    Demod.output = receivedResponse;
+       Demod.output = tagToReaderResponse;

     Demod.len = 0;
     Demod.state = DEMOD_UNSYNCD;
 
     // Setup for the DMA.
     Demod.len = 0;
     Demod.state = DEMOD_UNSYNCD;
 
     // Setup for the DMA.

-    FpgaSetupSsc();
+    FpgaSetupSsc(FPGA_MAJOR_MODE_HF_ISO14443A);

     upTo = dmaBuf;
     lastRxCounter = DMA_BUFFER_SIZE;
     FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
 
     // And the reader -> tag commands
     memset(&Uart, 0, sizeof(Uart));
     upTo = dmaBuf;
     lastRxCounter = DMA_BUFFER_SIZE;
     FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
 
     // 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;
 
     Uart.byteCntMax = 32; // was 100 (greg)////////////////////////////////////////////////////////////////////////
     Uart.state = STATE_UNSYNCD;
 


@@ -747,6 +694,10 @@ void RAMFUNC SnoopIClass(void)
     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
     SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
     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;
     int div = 0;
     //int div2 = 0;
     int decbyte = 0;


@@ -760,7 +711,7 @@ void RAMFUNC SnoopIClass(void)
                                 (DMA_BUFFER_SIZE-1);
         if(behindBy > maxBehindBy) {
             maxBehindBy = behindBy;
                                 (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;
             }
                 Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
                 goto done;
             }


@@ -780,20 +731,13 @@ void RAMFUNC SnoopIClass(void)
 
         //samples += 4;
        samples += 1;
 
         //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));
        }
        if(smpl & 0xF) {
                decbyte ^= (1 << (3 - div));
        }

-       //decbyte ^= (MajorityNibble[(smpl & 0x0F)] << (3 - div));

        
        // FOR READER SIDE COMMUMICATION...
        
        // FOR READER SIDE COMMUMICATION...

-       //decbyte ^=  ((smpl & 0x10) << (3 - div));
+

        decbyter <<= 2;
        decbyter ^= (smpl & 0x30);
 
        decbyter <<= 2;
        decbyter ^= (smpl & 0x30);
 


@@ -803,28 +747,24 @@ void RAMFUNC SnoopIClass(void)
                smpl = decbyter;        
                if(OutOfNDecoding((smpl & 0xF0) >> 4)) {
                    rsamples = samples - Uart.samples;
                smpl = decbyter;        
                if(OutOfNDecoding((smpl & 0xF0) >> 4)) {
                    rsamples = samples - Uart.samples;

+                       time_stop = (GetCountSspClk()-time_0) << 4;

                    LED_C_ON();
                    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_LENGTH) 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;
+                       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;
                    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;
        }
                }
                decbyter = 0;
        }


@@ -832,31 +772,22 @@ void RAMFUNC SnoopIClass(void)
        if(div > 3) {
                smpl = decbyte;
                if(ManchesterDecoding(smpl & 0x0F)) {
        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();
 
                    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_LENGTH) break;
-
-                   //triggered = TRUE;
+                       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));
 
                    // And ready to receive another response.
                    memset(&Demod, 0, sizeof(Demod));

-                   Demod.output = receivedResponse;
+                       Demod.output = tagToReaderResponse;

                    Demod.state = DEMOD_UNSYNCD;
                    LED_C_OFF();
                    Demod.state = DEMOD_UNSYNCD;
                    LED_C_OFF();

+               }else{
+                       time_start = (GetCountSspClk()-time_0) << 4;

                }
                
                div = 0;
                }
                
                div = 0;


@@ -873,16 +804,13 @@ void RAMFUNC SnoopIClass(void)
     DbpString("COMMAND FINISHED");
 
     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
     DbpString("COMMAND FINISHED");
 
     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);

-    Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
+       Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);

 
 done:
     AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
 
 done:
     AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);

-    Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
-    LED_A_OFF();
-    LED_B_OFF();
-    LED_C_OFF();
-    LED_D_OFF();
+       Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);
+    LEDsoff();

 }
 
 void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {
 }
 
 void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {


@@ -895,7 +823,7 @@ void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {
 //-----------------------------------------------------------------------------
 // Wait for commands from reader
 // Stop when button is pressed
 //-----------------------------------------------------------------------------
 // Wait for commands from reader
 // Stop when button is pressed

-// Or return TRUE when command is captured
+// Or return true when command is captured

 //-----------------------------------------------------------------------------
 static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
 {
 //-----------------------------------------------------------------------------
 static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
 {


@@ -913,72 +841,109 @@ static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
     for(;;) {
         WDT_HIT();
 
     for(;;) {
         WDT_HIT();
 

-        if(BUTTON_PRESS()) return FALSE;
+        if(BUTTON_PRESS()) return false;

 
         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
             AT91C_BASE_SSC->SSC_THR = 0x00;
         }
         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
             uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
 
         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
             AT91C_BASE_SSC->SSC_THR = 0x00;
         }
         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;
                        if(OutOfNDecoding(b & 0x0f)) {
                                *len = Uart.byteCnt;

-                               return TRUE;
+                               return true;

                        }
         }
     }
 }
 
                        }
         }
     }
 }
 

+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)
 {
 
 //-----------------------------------------------------------------------------
 // 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
        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++) {
 
        for(i = 0; i < len; i++) {

-               int j;

                uint8_t b = cmd[i];
                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
        }
 
        // 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++;
 }
        // Convert from last byte pos to length
        ToSendMax++;
 }


@@ -986,50 +951,142 @@ static void CodeIClassTagAnswer(const uint8_t *cmd, int len)
 // Only SOF 
 static void CodeIClassTagSOF()
 {
 // Only SOF 
 static void CodeIClassTagSOF()
 {

-       ToSendReset();
+       //So far a dummy implementation, not used
+       //int lastProxToAirDuration =0;

 
 

+       ToSendReset();

        // Send SOF
        // 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++;
 }
        // Convert from last byte pos to length
        ToSendMax++;
 }

-
-//-----------------------------------------------------------------------------
-// Simulate iClass Card
-// Only CSN (Card Serial Number)
-// 
-//-----------------------------------------------------------------------------
-void SimulateIClass(uint8_t arg0, uint8_t *datain)
+#define MODE_SIM_CSN        0
+#define MODE_EXIT_AFTER_MAC 1
+#define MODE_FULLSIM        2
+
+int doIClassSimulation(int simulationMode, 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);

 
 

-       // CSN followed by two CRC bytes
-       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 };
-
-       // e-Purse
-       uint8_t response4[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+       // Enable and clear the trace
+       set_tracing(true);
+       clear_trace();
+       //Use the emulator memory for SIM
+       uint8_t *emulator = BigBuf_get_EM_addr();

 
        if(simType == 0) {
                // Use the CSN from commandline
 
        if(simType == 0) {
                // Use the CSN from commandline

-               memcpy(response3, datain, 8);
+               memcpy(emulator, datain, 8);
+               doIClassSimulation(MODE_SIM_CSN,NULL);
+       }else if(simType == 1)
+       {
+               //Default CSN
+               uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
+               // Use the CSN from commandline
+               memcpy(emulator, csn_crc, 8);
+               doIClassSimulation(MODE_SIM_CSN,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(emulator, datain+(i*8), 8);
+                       if(doIClassSimulation(MODE_EXIT_AFTER_MAC,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 if(simType == 3){
+               //This is 'full sim' mode, where we use the emulator storage for data.
+               doIClassSimulation(MODE_FULLSIM, NULL);

        }
        }

+       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...");
+
+}
+void AppendCrc(uint8_t* data, int len)
+{
+       ComputeCrc14443(CRC_ICLASS,data,len,data+len,data+len+1);
+}
+
+/**
+ * @brief Does the actual simulation
+ * @param csn - csn to use
+ * @param breakAfterMacReceived if true, returns after reader MAC has been received.
+ */
+int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf)
+{
+       // free eventually allocated BigBuf memory
+       BigBuf_free_keep_EM();
+
+       State cipher_state;
+//     State cipher_state_reserve;
+       uint8_t *csn = BigBuf_get_EM_addr();
+       uint8_t *emulator = csn;
+       uint8_t sof_data[] = { 0x0F} ;
+       // CSN followed by two CRC bytes
+       uint8_t anticoll_data[10] = { 0 };
+       uint8_t csn_data[10] = { 0 };
+       memcpy(csn_data,csn,sizeof(csn_data));
+       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]);

 
        // Construct anticollision-CSN
 
        // Construct anticollision-CSN

-       rotateCSN(response3,response2);
+       rotateCSN(csn_data,anticoll_data);

 
        // Compute CRC on both CSNs
 
        // Compute CRC on both CSNs

-       ComputeCrc14443(CRC_ICLASS, response2, 8, &response2[8], &response2[9]);
-       ComputeCrc14443(CRC_ICLASS, response3, 8, &response3[8], &response3[9]);
+       ComputeCrc14443(CRC_ICLASS, anticoll_data, 8, &anticoll_data[8], &anticoll_data[9]);
+       ComputeCrc14443(CRC_ICLASS, csn_data, 8, &csn_data[8], &csn_data[9]);

 
 

+       uint8_t diversified_key[8] = { 0 };
+       // e-Purse
+       uint8_t card_challenge_data[8] = { 0x00 };
+       if(simulationMode == MODE_FULLSIM)
+       {
+               //The diversified key should be stored on block 3
+               //Get the diversified key from emulator memory
+               memcpy(diversified_key, emulator+(8*3),8);
+
+               //Card challenge, a.k.a e-purse is on block 2
+               memcpy(card_challenge_data,emulator + (8 * 2) , 8);
+               //Precalculate the cipher state, feeding it the CC
+               cipher_state = opt_doTagMAC_1(card_challenge_data,diversified_key);
+
+       }
+
+       int exitLoop = 0;

        // Reader 0a
        // Tag    0f
        // Reader 0c
        // Reader 0a
        // Tag    0f
        // Reader 0c


@@ -1037,31 +1094,32 @@ void SimulateIClass(uint8_t arg0, uint8_t *datain)
        // Reader 81 anticoll. CSN
        // Tag    CSN
 
        // Reader 81 anticoll. CSN
        // Tag    CSN
 

-        uint8_t *resp;
-        int respLen;
+       uint8_t *modulated_response;
+       int modulated_response_size = 0;
+       uint8_t* trace_data = NULL;
+       int trace_data_size = 0;
+

 
 

-       // Respond SOF -- takes 8 bytes
-       uint8_t *resp1 = (((uint8_t *)BigBuf) + 800);
-       int resp1Len;
+       // Respond SOF -- takes 1 bytes
+       uint8_t *resp_sof = BigBuf_malloc(2);
+       int resp_sof_Len;

 
        // Anticollision CSN (rotated CSN)
 
        // 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) + 810);
-       int resp2Len;
+       // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
+       uint8_t *resp_anticoll = BigBuf_malloc(28);
+       int resp_anticoll_len;

 
        // CSN
 
        // CSN

-       // 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit)
-       uint8_t *resp3 = (((uint8_t *)BigBuf) + 990);
-       int resp3Len;
+       // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
+       uint8_t *resp_csn = BigBuf_malloc(30);
+       int resp_csn_len;

 
        // e-Purse
 
        // e-Purse

-       // 144: Takes 16 bytes for SOF/EOF and 8 * 16 = 128 bytes (2 bytes/bit)
-       uint8_t *resp4 = (((uint8_t *)BigBuf) + 1170);
-       int resp4Len;
+       // 18: Takes 2 bytes for SOF/EOF and 8 * 2 = 16 bytes (2 bytes/bit)
+       uint8_t *resp_cc = BigBuf_malloc(20);
+       int resp_cc_len;

 
 

-       // + 1720..
-       uint8_t *receivedCmd = (uint8_t *)BigBuf;
-       memset(receivedCmd, 0x44, 400);
+       uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);

        int len;
 
        // Prepare card messages
        int len;
 
        // Prepare card messages


@@ -1069,79 +1127,167 @@ void SimulateIClass(uint8_t arg0, uint8_t *datain)
 
        // First card answer: SOF
        CodeIClassTagSOF();
 
        // First card answer: SOF
        CodeIClassTagSOF();

-       memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
+       memcpy(resp_sof, ToSend, ToSendMax); resp_sof_Len = ToSendMax;

 
        // Anticollision CSN
 
        // Anticollision CSN

-       CodeIClassTagAnswer(response2, sizeof(response2));
-       memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax;
+       CodeIClassTagAnswer(anticoll_data, sizeof(anticoll_data));
+       memcpy(resp_anticoll, ToSend, ToSendMax); resp_anticoll_len = ToSendMax;

 
        // CSN
 
        // CSN

-       CodeIClassTagAnswer(response3, sizeof(response3));
-       memcpy(resp3, ToSend, ToSendMax); resp3Len = ToSendMax;
+       CodeIClassTagAnswer(csn_data, sizeof(csn_data));
+       memcpy(resp_csn, ToSend, ToSendMax); resp_csn_len = ToSendMax;

 
        // e-Purse
 
        // e-Purse

-       CodeIClassTagAnswer(response4, sizeof(response4));
-       memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax;
+       CodeIClassTagAnswer(card_challenge_data, sizeof(card_challenge_data));
+       memcpy(resp_cc, ToSend, ToSendMax); resp_cc_len = ToSendMax;

 
 

+       //This is used for responding to READ-block commands or other data which is dynamically generated
+       //First the 'trace'-data, not encoded for FPGA
+       uint8_t *data_generic_trace = BigBuf_malloc(8 + 2);//8 bytes data + 2byte CRC is max tag answer
+       //Then storage for the modulated data
+       //Each bit is doubled when modulated for FPGA, and we also have SOF and EOF (2 bytes)
+       uint8_t *data_response = BigBuf_malloc( (8+2) * 2 + 2);
+
+       // 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);
        // We need to listen to the high-frequency, peak-detected path.
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);

-       FpgaSetupSsc();
+       FpgaSetupSsc(FPGA_MAJOR_MODE_HF_ISO14443A);

 
        // To control where we are in the protocol
        int cmdsRecvd = 0;
 
        // 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();
 
        LED_A_ON();

-       for(;;) {
+       bool buttonPressed = false;
+       uint8_t response_delay = 1;
+       while(!exitLoop) {
+               response_delay = 1;

                LED_B_OFF();
                LED_B_OFF();

+               //Signal tracer
+               // Can be used to get a trigger for an oscilloscope..
+               LED_C_OFF();
+

                if(!GetIClassCommandFromReader(receivedCmd, &len, 100)) {
                if(!GetIClassCommandFromReader(receivedCmd, &len, 100)) {

-                       DbpString("button press");
+                       buttonPressed = true;

                        break;
                        break;

-                       }
+               }
+               r2t_time = GetCountSspClk();
+               //Signal tracer
+               LED_C_ON();

 
 

-               // Okay, look at the command now.
-               if(receivedCmd[0] == 0x0a) {
+               // Okay, look at the command now.
+               if(receivedCmd[0] == ICLASS_CMD_ACTALL ) {

                        // Reader in anticollission phase
                        // Reader in anticollission phase

-                       resp = resp1; respLen = resp1Len; //order = 1;
-                       //resp = resp2; respLen = resp2Len; order = 2;
-                       //DbpString("Hello request from reader:");
-               } else if(receivedCmd[0] == 0x0c) {
+                       modulated_response = resp_sof; modulated_response_size = resp_sof_Len; //order = 1;
+                       trace_data = sof_data;
+                       trace_data_size = sizeof(sof_data);
+               } else if(receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 1) {

                        // Reader asks for anticollission CSN
                        // Reader asks for anticollission CSN

-                       resp = resp2; respLen = resp2Len; //order = 2;
+                       modulated_response = resp_anticoll; modulated_response_size = resp_anticoll_len; //order = 2;
+                       trace_data = anticoll_data;
+                       trace_data_size = sizeof(anticoll_data);

                        //DbpString("Reader requests anticollission CSN:");
                        //DbpString("Reader requests anticollission CSN:");

-               } else if(receivedCmd[0] == 0x81) {
+               } else if(receivedCmd[0] == ICLASS_CMD_SELECT) {

                        // Reader selects anticollission CSN.
                        // Tag sends the corresponding real CSN
                        // Reader selects anticollission CSN.
                        // Tag sends the corresponding real CSN

-                       resp = resp3; respLen = resp3Len; //order = 3;
+                       modulated_response = resp_csn; modulated_response_size = resp_csn_len; //order = 3;
+                       trace_data = csn_data;
+                       trace_data_size = sizeof(csn_data);

                        //DbpString("Reader selects anticollission CSN:");
                        //DbpString("Reader selects anticollission CSN:");

-               } else if(receivedCmd[0] == 0x88) {
+               } else if(receivedCmd[0] == ICLASS_CMD_READCHECK_KD) {

                        // Read e-purse (88 02)
                        // Read e-purse (88 02)

-                       resp = resp4; respLen = resp4Len; //order = 4;
+                       modulated_response = resp_cc; modulated_response_size = resp_cc_len; //order = 4;
+                       trace_data = card_challenge_data;
+                       trace_data_size = sizeof(card_challenge_data);

                        LED_B_ON();
                        LED_B_ON();

-               } else if(receivedCmd[0] == 0x05) {
+               } else if(receivedCmd[0] == ICLASS_CMD_CHECK) {

                        // Reader random and reader MAC!!!
                        // 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]);
+                       if(simulationMode == MODE_FULLSIM)
+                       {
+                               //NR, from reader, is in receivedCmd +1
+                               opt_doTagMAC_2(cipher_state,receivedCmd+1,data_generic_trace,diversified_key);
+
+                               trace_data = data_generic_trace;
+                               trace_data_size = 4;
+                               CodeIClassTagAnswer(trace_data , trace_data_size);
+                               memcpy(data_response, ToSend, ToSendMax);
+                               modulated_response = data_response;
+                               modulated_response_size = ToSendMax;
+                               response_delay = 0;//We need to hurry here...
+                               //exitLoop = true;
+                       }else
+                       {       //Not fullsim, we don't respond
+                               // We do not know what to answer, so lets keep quiet
+                               modulated_response = resp_sof; modulated_response_size = 0;
+                               trace_data = NULL;
+                               trace_data_size = 0;
+                               if (simulationMode == MODE_EXIT_AFTER_MAC){
+                                       // 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;
+                               }
+                       }

 
 

-                       // Do not respond
-                       // We do not know what to answer, so lets keep quit
-                       resp = resp1; respLen = 0; //order = 5;
-               } else if(receivedCmd[0] == 0x00 && len == 1) {
+               } else if(receivedCmd[0] == ICLASS_CMD_HALT && len == 1) {

                        // Reader ends the session
                        // Reader ends the session

-                       resp = resp1; respLen = 0; //order = 0;
-/*             } else if(receivedCmd[0] == 0x50) {
-                       // Received a HALT
-                       resp = resp1; respLen = 0; order = 5; // Do nothing
-                       DbpString("Reader requested we HALT!:");
-*/
-               } else {
+                       modulated_response = resp_sof; modulated_response_size = 0; //order = 0;
+                       trace_data = NULL;
+                       trace_data_size = 0;
+               } else if(simulationMode == MODE_FULLSIM && receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 4){
+                       //Read block
+                       uint16_t blk = receivedCmd[1];
+                       //Take the data...
+                       memcpy(data_generic_trace, emulator+(blk << 3),8);
+                       //Add crc
+                       AppendCrc(data_generic_trace, 8);
+                       trace_data = data_generic_trace;
+                       trace_data_size = 10;
+                       CodeIClassTagAnswer(trace_data , trace_data_size);
+                       memcpy(data_response, ToSend, ToSendMax);
+                       modulated_response = data_response;
+                       modulated_response_size = ToSendMax;
+               }else if(receivedCmd[0] == ICLASS_CMD_UPDATE && simulationMode == MODE_FULLSIM)
+               {//Probably the reader wants to update the nonce. Let's just ignore that for now.
+                       // OBS! If this is implemented, don't forget to regenerate the cipher_state
+                       //We're expected to respond with the data+crc, exactly what's already in the receivedcmd
+                       //receivedcmd is now UPDATE 1b | ADDRESS 1b| DATA 8b| Signature 4b or CRC 2b|
+
+                       //Take the data...
+                       memcpy(data_generic_trace, receivedCmd+2,8);
+                       //Add crc
+                       AppendCrc(data_generic_trace, 8);
+                       trace_data = data_generic_trace;
+                       trace_data_size = 10;
+                       CodeIClassTagAnswer(trace_data , trace_data_size);
+                       memcpy(data_response, ToSend, ToSendMax);
+                       modulated_response = data_response;
+                       modulated_response_size = ToSendMax;
+               }
+               else if(receivedCmd[0] == ICLASS_CMD_PAGESEL)
+               {//Pagesel
+                       //Pagesel enables to select a page in the selected chip memory and return its configuration block
+                       //Chips with a single page will not answer to this command
+                       // It appears we're fine ignoring this.
+                       //Otherwise, we should answer 8bytes (block) + 2bytes CRC
+               }
+               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,
                        // Never seen this command before
                        Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x",
                        len,


@@ -1149,66 +1295,84 @@ void SimulateIClass(uint8_t arg0, uint8_t *datain)
                        receivedCmd[3], receivedCmd[4], receivedCmd[5],
                        receivedCmd[6], receivedCmd[7], receivedCmd[8]);
                        // Do not respond
                        receivedCmd[3], receivedCmd[4], receivedCmd[5],
                        receivedCmd[6], receivedCmd[7], receivedCmd[8]);
                        // Do not respond

-                       resp = resp1; respLen = 0; //order = 0;
+                       modulated_response = resp_sof; modulated_response_size = 0; //order = 0;
+                       trace_data = NULL;
+                       trace_data_size = 0;

                }
 
                }
 

-               memset(receivedCmd, 0x44, 32);
-
-               if(cmdsRecvd > 999) {
-                       DbpString("1000 commands later...");
-                       break;
+               if(cmdsRecvd >  100) {
+                       //DbpString("100 commands later...");
+                       //break;

                }
                else {
                        cmdsRecvd++;
                }
                }
                else {
                        cmdsRecvd++;
                }

+               /**
+               A legit tag has about 380us delay between reader EOT and tag SOF.
+               **/
+               if(modulated_response_size > 0) {
+                       SendIClassAnswer(modulated_response, modulated_response_size, response_delay);
+                       t2r_time = GetCountSspClk();
+               }

 
 

-               if(respLen <= 0) continue;
+               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);

 
 

-               SendIClassAnswer(resp, respLen, 21);
-    }
+               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(!get_tracing()) {
+                       DbpString("Trace full");
+                       //break;
+               }
+       }

 
 

-       Dbprintf("%x", cmdsRecvd);
+       //Dbprintf("%x", cmdsRecvd);

        LED_A_OFF();
        LED_B_OFF();
        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)
 {
 }
 
 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;
        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;
        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;
+       FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR);
+       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) {
                        if(d < delay) {

-                               b = 0x00;

                                d++;
                        }
                                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;
                        }
                        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;
        }
 
        return 0;


@@ -1222,29 +1386,31 @@ 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;
 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;
   FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
   AT91C_BASE_SSC->SSC_THR = 0x00;

-  FpgaSetupSsc();
+  FpgaSetupSsc(FPGA_MAJOR_MODE_HF_ISO14443A);

 
    if (wait)
 
    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;
 
   uint8_t sendbyte;

-  bool firstpart = TRUE;
+  bool firstpart = true;

   c = 0;
   for(;;) {
     if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
   c = 0;
   for(;;) {
     if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {


@@ -1273,7 +1439,7 @@ static void TransmitIClassCommand(const uint8_t *cmd, int len, int *samples, int
     }
     WDT_HIT();
   }
     }
     WDT_HIT();
   }

-  if (samples) *samples = (c + *wait) << 3;
+  if (samples && wait) *samples = (c + *wait) << 3;

 }
 
 
 }
 
 


@@ -1298,12 +1464,12 @@ void CodeIClassCommand(const uint8_t * cmd, int len)
     b = cmd[i];
     for(j = 0; j < 4; j++) {
       for(k = 0; k < 4; k++) {
     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] = 0xf0;
+                       }
+                       else {
+                               ToSend[++ToSendMax] = 0x00;
+                       }

       }
       b >>= 2;
     }
       }
       b >>= 2;
     }


@@ -1321,27 +1487,27 @@ void CodeIClassCommand(const uint8_t * cmd, int len)
 
 void ReaderTransmitIClass(uint8_t* frame, int len)
 {
 
 void ReaderTransmitIClass(uint8_t* frame, int len)
 {

-  int wait = 0;
-  int samples = 0;
-  int par = 0;
+       int wait = 0;
+       int samples = 0;

 
 

-  // This is tied to other size changes
-  //   uint8_t* frame_addr = ((uint8_t*)BigBuf) + 2024;
-  CodeIClassCommand(frame,len);
+       // This is tied to other size changes
+       CodeIClassCommand(frame,len);

 
 

-  // Select the card
-  TransmitIClassCommand(ToSend, ToSendMax, &samples, &wait);
-  if(trigger)
-       LED_A_ON();
+       // Select the card
+       TransmitIClassCommand(ToSend, ToSendMax, &samples, &wait);
+       if(trigger)
+               LED_A_ON();

 
 

-  // Store reader command in buffer
-  if (tracing) LogTrace(frame,len,0,par,TRUE);
+       // Store reader command in buffer
+       uint8_t par[MAX_PARITY_SIZE];
+       GetParity(frame, len, par);
+       LogTrace(frame, len, rsamples, rsamples, par, true);

 }
 
 //-----------------------------------------------------------------------------
 // Wait a certain time for tag response
 }
 
 //-----------------------------------------------------------------------------
 // Wait a certain time for tag response

-//  If a response is captured return TRUE
-//  If it takes too long return FALSE
+//  If a response is captured return true
+//  If it takes too long return false

 //-----------------------------------------------------------------------------
 static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) //uint8_t *buffer
 {
 //-----------------------------------------------------------------------------
 static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) //uint8_t *buffer
 {


@@ -1360,30 +1526,27 @@ static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples,
        uint8_t b;
        if (elapsed) *elapsed = 0;
 
        uint8_t b;
        if (elapsed) *elapsed = 0;
 

-       bool skip = FALSE;
+       bool skip = false;

 
        c = 0;
        for(;;) {
                WDT_HIT();
 
 
        c = 0;
        for(;;) {
                WDT_HIT();
 

-               if(BUTTON_PRESS()) return FALSE;
+               if(BUTTON_PRESS()) return false;

 
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
                        AT91C_BASE_SSC->SSC_THR = 0x00;  // To make use of exact timing of next command from reader!!
                        if (elapsed) (*elapsed)++;
                }
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
 
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
                        AT91C_BASE_SSC->SSC_THR = 0x00;  // To make use of exact timing of next command from reader!!
                        if (elapsed) (*elapsed)++;
                }
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {

-                       if(c < timeout) { c++; } else { return FALSE; }
+                       if(c < timeout) { c++; } else { return false; }

                        b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                        skip = !skip;
                        if(skip) continue;
                        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;
                        if(ManchesterDecoding(b & 0x0f)) {
                                *samples = c << 3;

-                               return  TRUE;
+                               return  true;

                        }
                }
        }
                        }
                }
        }


@@ -1392,110 +1555,500 @@ static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples,
 int ReaderReceiveIClass(uint8_t* receivedAnswer)
 {
   int samples = 0;
 int ReaderReceiveIClass(uint8_t* receivedAnswer)
 {
   int samples = 0;

-  if (!GetIClassAnswer(receivedAnswer,160,&samples,0)) return FALSE;
-  if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE);
-  if(samples == 0) return FALSE;
+  if (!GetIClassAnswer(receivedAnswer,160,&samples,0)) return false;
+  rsamples += samples;
+  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;
 }
 
   return Demod.len;
 }
 

+void setupIclassReader()
+{
+    FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+    // Reset trace buffer
+         set_tracing(true);
+         clear_trace();
+
+    // Setup SSC
+    FpgaSetupSsc(FPGA_MAJOR_MODE_HF_ISO14443A);
+    // 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();
+
+}
+
+bool 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 true;
+               }
+       }
+       return false;//Error
+}
+
+/**
+ * @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_ext(uint8_t *card_data, bool use_credit_key)
+{
+       static uint8_t act_all[]     = { 0x0a };
+       //static uint8_t identify[]    = { 0x0c };
+       static uint8_t identify[]    = { 0x0c, 0x00, 0x73, 0x33 };
+       static uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+       static uint8_t readcheck_cc[]= { 0x88, 0x02 };
+       if (use_credit_key)
+               readcheck_cc[0] = 0x18;
+       else
+               readcheck_cc[0] = 0x88;
+
+       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) (only 8 bytes no CRC)
+       ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
+       if(ReaderReceiveIClass(resp) == 8) {
+               //Save CC (e-purse) in response data
+               memcpy(card_data+8,resp,8);
+               read_status++;
+       }
+
+       return read_status;
+}
+uint8_t handshakeIclassTag(uint8_t *card_data) {
+       return handshakeIclassTag_ext(card_data, false);
+}
+
+

 // Reader iClass Anticollission
 void ReaderIClass(uint8_t arg0) {
 // 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 };

 
 

-       uint8_t* resp = (((uint8_t *)BigBuf) + 3560);   // was 3560 - tied to other size changes
+       uint8_t card_data[6 * 8]={0};
+       memset(card_data, 0xFF, sizeof(card_data));
+       uint8_t last_csn[8]={0,0,0,0,0,0,0,0};
+       uint8_t resp[ICLASS_BUFFER_SIZE];
+       memset(resp, 0xFF, sizeof(resp));
+       //Read conf block CRC(0x01) => 0xfa 0x22
+       uint8_t readConf[] = { ICLASS_CMD_READ_OR_IDENTIFY,0x01, 0xfa, 0x22};
+       //Read App Issuer Area block CRC(0x05) => 0xde  0x64
+       uint8_t readAA[] = { ICLASS_CMD_READ_OR_IDENTIFY,0x05, 0xde, 0x64};
+
+       int read_status= 0;
+       uint8_t result_status = 0;
+       // flag to read until one tag is found successfully
+       bool abort_after_read = arg0 & FLAG_ICLASS_READER_ONLY_ONCE;
+       // flag to only try 5 times to find one tag then return
+       bool try_once = arg0 & FLAG_ICLASS_READER_ONE_TRY;
+       // if neither abort_after_read nor try_once then continue reading until button pressed.
+
+       bool use_credit_key = arg0 & FLAG_ICLASS_READER_CEDITKEY;
+       // test flags for what blocks to be sure to read
+       uint8_t flagReadConfig = arg0 & FLAG_ICLASS_READER_CONF;
+       uint8_t flagReadCC = arg0 & FLAG_ICLASS_READER_CC;
+       uint8_t flagReadAA = arg0 & FLAG_ICLASS_READER_AA;
+
+       set_tracing(true);
+       setupIclassReader();
+
+       uint16_t tryCnt=0;
+       bool userCancelled = BUTTON_PRESS() || usb_poll_validate_length();
+       while(!userCancelled)
+       {
+               // if only looking for one card try 2 times if we missed it the first time
+               if (try_once && tryCnt > 2) break; 
+               tryCnt++;
+               if(!get_tracing()) {
+                       DbpString("Trace full");
+                       break;
+               }
+               WDT_HIT();
+
+               read_status = handshakeIclassTag_ext(card_data, use_credit_key);
+
+               if(read_status == 0) continue;
+               if(read_status == 1) result_status = FLAG_ICLASS_READER_CSN;
+               if(read_status == 2) result_status = FLAG_ICLASS_READER_CSN|FLAG_ICLASS_READER_CC;
+
+               // handshakeIclass returns CSN|CC, but the actual block
+               // layout is CSN|CONFIG|CC, so here we reorder the data,
+               // moving CC forward 8 bytes
+               memcpy(card_data+16,card_data+8, 8);
+               //Read block 1, config
+               if(flagReadConfig) {
+                       if(sendCmdGetResponseWithRetries(readConf, sizeof(readConf), resp, 10, 10))
+                       {
+                               result_status |= FLAG_ICLASS_READER_CONF;
+                               memcpy(card_data+8, resp, 8);
+                       } else {
+                               Dbprintf("Failed to dump config block");
+                       }
+               }

 
 

-       // Reset trace buffer
-       memset(trace, 0x44, RECV_CMD_OFFSET);
-       traceLen = 0;
+               //Read block 5, AA
+               if(flagReadAA) {
+                       if(sendCmdGetResponseWithRetries(readAA, sizeof(readAA), resp, 10, 10))
+                       {
+                               result_status |= FLAG_ICLASS_READER_AA;
+                               memcpy(card_data+(8*5), resp, 8);
+                       } else {
+                               //Dbprintf("Failed to dump AA block");
+                       }
+               }

 
 

-       // 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);
+               // 0 : CSN
+               // 1 : Configuration
+               // 2 : e-purse
+               // (3,4 write-only, kc and kd)
+               // 5 Application issuer area
+               //
+               //Then we can 'ship' back the 8 * 6 bytes of data,
+               // with 0xFF:s in block 3 and 4.
+
+               LED_B_ON();
+               //Send back to client, but don't bother if we already sent this - 
+               //  only useful if looping in arm (not try_once && not abort_after_read)
+               if(memcmp(last_csn, card_data, 8) != 0)
+               {
+                       // If caller requires that we get Conf, CC, AA, continue until we got it
+                       if( (result_status ^ FLAG_ICLASS_READER_CSN ^ flagReadConfig ^ flagReadCC ^ flagReadAA) == 0) {
+                               cmd_send(CMD_ACK,result_status,0,0,card_data,sizeof(card_data));
+                               if(abort_after_read) {
+                                       LED_A_OFF();
+                                       LED_B_OFF();
+                                       return;
+                               }
+                               //Save that we already sent this....
+                               memcpy(last_csn, card_data, 8);
+                       }

 
 

-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+               }
+               LED_B_OFF();
+               userCancelled = BUTTON_PRESS() || usb_poll_validate_length();
+       }
+       if (userCancelled) {
+               cmd_send(CMD_ACK,0xFF,0,0,card_data, 0);
+       } else {
+               cmd_send(CMD_ACK,0,0,0,card_data, 0);
+       }
+       LED_A_OFF();
+}

 
 

-       // 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);
+void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {

 
 

-       LED_A_ON();
+       uint8_t card_data[USB_CMD_DATA_SIZE]={0};
+       uint16_t block_crc_LUT[255] = {0};

 
 

-       for(;;) {
-               if(traceLen > TRACE_LENGTH || BUTTON_PRESS()) break;
-
-               // Send act_all
-               ReaderTransmitIClass(act_all, 1);
-               // Card present?
-               if(ReaderReceiveIClass(resp)) {
-                       ReaderTransmitIClass(identify, 1);
-                       if(ReaderReceiveIClass(resp)) {
-                               //ReaderTransmitIClass(select, sizeof(select));
-                       }
+       {//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);

                }
                }

-               WDT_HIT();

        }
        }

+       //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 };

        
        

-       LED_A_OFF();
+    uint16_t crc = 0;
+       uint8_t cardsize=0;
+       uint8_t mem=0;
+       
+       static struct memory_t{
+         int k16;
+         int book;
+         int k2;
+         int lockauth;
+         int keyaccess;
+       } memory;
+       
+       uint8_t resp[ICLASS_BUFFER_SIZE];
+       
+    setupIclassReader();
+       set_tracing(true);

 
 

-/*     if(resp_data)
-               memcpy(resp_data->atqa, resp, 2);
+       while(!BUTTON_PRESS()) {

        
        

-       // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in
-       // which case we need to make a cascade 2 request and select - this is a long UID
-       // While the UID is not complete, the 3nd bit (from the right) is set in the SAK.
-       for(; sak & 0x04; cascade_level++)
-       {
-               // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97)
-               sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2;
+               WDT_HIT();

 
 

-               // SELECT_ALL
-               ReaderTransmit(sel_all,sizeof(sel_all));
-               if (!ReaderReceive(resp)) return 0;
-               if(uid_ptr) memcpy(uid_ptr + cascade_level*4, resp, 4);
+               if(!get_tracing()) {
+                       DbpString("Trace full");
+                       break;
+               }

                
                

-               // calculate crypto UID
-               if(cuid_ptr) *cuid_ptr = bytes_to_num(resp, 4);
+               uint8_t read_status = handshakeIclassTag(card_data);
+               if(read_status < 2) continue;
+
+               //for now replay captured auth (as cc not updated)
+               memcpy(check+5,MAC,4);
+
+               if(!sendCmdGetResponseWithRetries(check, sizeof(check),resp, 4, 5))
+               {
+                       Dbprintf("Error: Authentication Fail!");
+                       continue;
+               }
+
+               //first get configuration block (block 1)
+               crc = block_crc_LUT[1];
+               read[1]=1;
+               read[2] = crc >> 8;
+               read[3] = crc & 0xff;
+
+               if(!sendCmdGetResponseWithRetries(read, sizeof(read),resp, 10, 10))
+               {
+                       Dbprintf("Dump config (block 1) failed");
+                       continue;
+               }

 
 

-               // Construct SELECT UID command
-               memcpy(sel_uid+2,resp,5);
-               AppendCrc14443a(sel_uid,7);
-               ReaderTransmit(sel_uid,sizeof(sel_uid));
+               mem=resp[5];
+               memory.k16= (mem & 0x80);
+               memory.book= (mem & 0x20);
+               memory.k2= (mem & 0x8);
+               memory.lockauth= (mem & 0x2);
+               memory.keyaccess= (mem & 0x1);

 
 

-               // Receive the SAK
-               if (!ReaderReceive(resp)) return 0;
-               sak = resp[0];
+               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;
+               uint32_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;
+                               }
+
+                       }else{
+                               failedRead = 1;
+                               stored_data_length +=8;//Otherwise, data becomes misaligned
+                               Dbprintf("Failed to dump block %d", block);
+                       }
+               }
+
+               //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;

        }
        }

-       if(resp_data) {
-               resp_data->sak = sak;
-               resp_data->ats_len = 0;
+       //Signal end of transmission
+       cmd_send(CMD_ACK,
+                        0,//data length
+                        0,//Failed blocks?
+                        0,//Not used ATM
+                        card_data, 0);
+
+       LED_A_OFF();
+}
+
+void iClass_ReadCheck(uint8_t  blockNo, uint8_t keyType) {
+       uint8_t readcheck[] = { keyType, blockNo };
+       uint8_t resp[] = {0,0,0,0,0,0,0,0};
+       size_t isOK = 0;
+       isOK = sendCmdGetResponseWithRetries(readcheck, sizeof(readcheck), resp, sizeof(resp), 6);
+       cmd_send(CMD_ACK,isOK,0,0,0,0);
+}
+
+void iClass_Authentication(uint8_t *MAC) {
+       uint8_t check[] = { ICLASS_CMD_CHECK, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+       uint8_t resp[ICLASS_BUFFER_SIZE];
+       memcpy(check+5,MAC,4);
+       bool isOK;
+       isOK = sendCmdGetResponseWithRetries(check, sizeof(check), resp, 4, 6);
+       cmd_send(CMD_ACK,isOK,0,0,0,0);
+}
+bool iClass_ReadBlock(uint8_t blockNo, uint8_t *readdata) {
+       uint8_t readcmd[] = {ICLASS_CMD_READ_OR_IDENTIFY, blockNo, 0x00, 0x00}; //0x88, 0x00 // can i use 0C?
+       char bl = blockNo;
+       uint16_t rdCrc = iclass_crc16(&bl, 1);
+       readcmd[2] = rdCrc >> 8;
+       readcmd[3] = rdCrc & 0xff;
+       uint8_t resp[] = {0,0,0,0,0,0,0,0,0,0};
+       bool isOK = false;
+
+       //readcmd[1] = blockNo;
+       isOK = sendCmdGetResponseWithRetries(readcmd, sizeof(readcmd), resp, 10, 10);
+       memcpy(readdata, resp, sizeof(resp));
+
+       return isOK;
+}
+
+void iClass_ReadBlk(uint8_t blockno) {
+       uint8_t readblockdata[] = {0,0,0,0,0,0,0,0,0,0};
+       bool isOK = false;
+       isOK = iClass_ReadBlock(blockno, readblockdata);
+       cmd_send(CMD_ACK, isOK, 0, 0, readblockdata, 8);
+}
+
+void iClass_Dump(uint8_t blockno, uint8_t numblks) {
+       uint8_t readblockdata[] = {0,0,0,0,0,0,0,0,0,0};
+       bool isOK = false;
+       uint8_t blkCnt = 0;
+
+       BigBuf_free();
+       uint8_t *dataout = BigBuf_malloc(255*8);
+       if (dataout == NULL){
+               Dbprintf("out of memory");
+               FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+               LED_D_OFF();
+               cmd_send(CMD_ACK,0,1,0,0,0);
+               LED_A_OFF();
+               return;

        }
        }

-       //--  this byte not UID, it CT.  http://www.nxp.com/documents/application_note/AN10927.pdf  page 3
-       if (uid_ptr[0] == 0x88) {  
-               memcpy(uid_ptr, uid_ptr + 1, 7);
-               uid_ptr[7] = 0;
+       memset(dataout,0xFF,255*8);
+
+       for (;blkCnt < numblks; blkCnt++) {
+               isOK = iClass_ReadBlock(blockno+blkCnt, readblockdata);
+               if (!isOK || (readblockdata[0] == 0xBB || readblockdata[7] == 0xBB || readblockdata[2] == 0xBB)) { //try again
+                       isOK = iClass_ReadBlock(blockno+blkCnt, readblockdata);
+                       if (!isOK) {
+                               Dbprintf("Block %02X failed to read", blkCnt+blockno);
+                               break;
+                       }
+               }
+               memcpy(dataout+(blkCnt*8),readblockdata,8);

        }
        }

+       //return pointer to dump memory in arg3
+       cmd_send(CMD_ACK,isOK,blkCnt,BigBuf_max_traceLen(),0,0);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       LEDsoff();
+       BigBuf_free();
+}

 
 

-       if( (sak & 0x20) == 0)
-               return 2; // non iso14443a compliant tag
+bool iClass_WriteBlock_ext(uint8_t blockNo, uint8_t *data) {
+       uint8_t write[] = { ICLASS_CMD_UPDATE, blockNo, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+       //uint8_t readblockdata[10];
+       //write[1] = blockNo;
+       memcpy(write+2, data, 12); // data + mac
+       char *wrCmd = (char *)(write+1); 
+       uint16_t wrCrc = iclass_crc16(wrCmd, 13);
+       write[14] = wrCrc >> 8;
+       write[15] = wrCrc & 0xff;
+       uint8_t resp[] = {0,0,0,0,0,0,0,0,0,0};
+       bool isOK = false;
+
+       isOK = sendCmdGetResponseWithRetries(write,sizeof(write),resp,sizeof(resp),10);
+       if (isOK) { //if reader responded correctly
+               //Dbprintf("WriteResp: %02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",resp[0],resp[1],resp[2],resp[3],resp[4],resp[5],resp[6],resp[7],resp[8],resp[9]);
+               if (memcmp(write+2,resp,8)) {  //if response is not equal to write values
+                       if (blockNo != 3 && blockNo != 4) { //if not programming key areas (note key blocks don't get programmed with actual key data it is xor data)
+                               //error try again
+                               isOK = sendCmdGetResponseWithRetries(write,sizeof(write),resp,sizeof(resp),10);
+                       } 
+                       
+               }
+       }
+       return isOK;
+}

 
 

-       // Request for answer to select
-       if(resp_data) {  // JCOP cards - if reader sent RATS then there is no MIFARE session at all!!!
-               AppendCrc14443a(rats, 2);
-               ReaderTransmit(rats, sizeof(rats));
-               
-               if (!(len = ReaderReceive(resp))) return 0;
-               
-               memcpy(resp_data->ats, resp, sizeof(resp_data->ats));
-               resp_data->ats_len = len;
+void iClass_WriteBlock(uint8_t blockNo, uint8_t *data) {
+       bool isOK = iClass_WriteBlock_ext(blockNo, data);
+       if (isOK){
+               Dbprintf("Write block [%02x] successful",blockNo);
+       } else {
+               Dbprintf("Write block [%02x] failed",blockNo);          

        }
        }

-*/     
+       cmd_send(CMD_ACK,isOK,0,0,0,0); 

 }
 
 }
 

+void iClass_Clone(uint8_t startblock, uint8_t endblock, uint8_t *data) {
+       int i;
+       int written = 0;
+       int total_block = (endblock - startblock) + 1;
+       for (i = 0; i < total_block;i++){
+               // block number
+               if (iClass_WriteBlock_ext(i+startblock, data+(i*12))){
+                       Dbprintf("Write block [%02x] successful",i + startblock);
+                       written++;
+               } else {
+                       if (iClass_WriteBlock_ext(i+startblock, data+(i*12))){
+                               Dbprintf("Write block [%02x] successful",i + startblock);
+                               written++;
+                       } else {
+                               Dbprintf("Write block [%02x] failed",i + startblock);
+                       }
+               }
+       }
+       if (written == total_block)
+               Dbprintf("Clone complete");
+       else
+               Dbprintf("Clone incomplete");   

 
 

+       cmd_send(CMD_ACK,1,0,0,0,0);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       LEDsoff();
+}