X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/94ad01bfba1c29747f9c42942bbec6b834695ef2..4888b2819574627efea9bd7d23444d785c5a2077:/armsrc/iclass.c

diff --git a/armsrc/iclass.c b/armsrc/iclass.c
index 7289abbc..ea9af7d4 100644
--- a/armsrc/iclass.c
+++ b/armsrc/iclass.c
@@ -41,10 +41,12 @@
 #include "util.h"
 #include "string.h"
 #include "common.h"
+#include "cmd.h"
 // Needed for CRC in emulation mode;
 // same construction as in ISO 14443;
 // different initial value (CRC_ICLASS)
 #include "iso14443crc.h"
+#include "iso15693tools.h"
 
 static int timeout = 4096;
 
@@ -69,14 +71,13 @@ static struct {
     int     nOutOfCnt;
     int     OutOfCnt;
     int     syncBit;
-    int     parityBits;
     int     samples;
     int     highCnt;
     int     swapper;
     int     counter;
     int     bitBuffer;
     int     dropPosition;
-    uint8_t   *output;
+    uint8_t *output;
 } Uart;
 
 static RAMFUNC int OutOfNDecoding(int bit)
@@ -135,11 +136,8 @@ static RAMFUNC int OutOfNDecoding(int bit)
 					if(Uart.byteCnt == 0) {
 						// Its not straightforward to show single EOFs
 						// So just leave it and do not return TRUE
-						Uart.output[Uart.byteCnt] = 0xf0;
+						Uart.output[0] = 0xf0;
 						Uart.byteCnt++;
-
-						// Calculate the parity bit for the client...
-						Uart.parityBits = 1;
 					}
 					else {
 						return TRUE;
@@ -221,11 +219,6 @@ static RAMFUNC int OutOfNDecoding(int bit)
 						if(Uart.bitCnt == 8) {
 							Uart.output[Uart.byteCnt] = (Uart.shiftReg & 0xff);
 							Uart.byteCnt++;
-
-							// Calculate the parity bit for the client...
-							Uart.parityBits <<= 1;
-							Uart.parityBits ^= OddByteParity[(Uart.shiftReg & 0xff)];
-
 							Uart.bitCnt = 0;
 							Uart.shiftReg = 0;
 						}
@@ -244,11 +237,6 @@ static RAMFUNC int OutOfNDecoding(int bit)
 					Uart.dropPosition--;
 					Uart.output[Uart.byteCnt] = (Uart.dropPosition & 0xff);
 					Uart.byteCnt++;
-
-					// Calculate the parity bit for the client...
-					Uart.parityBits <<= 1;
-					Uart.parityBits ^= OddByteParity[(Uart.dropPosition & 0xff)];
-
 					Uart.bitCnt = 0;
 					Uart.shiftReg = 0;
 					Uart.nOutOfCnt = 0;
@@ -309,7 +297,6 @@ static RAMFUNC int OutOfNDecoding(int bit)
 				Uart.state = STATE_START_OF_COMMUNICATION;
 				Uart.bitCnt = 0;
 				Uart.byteCnt = 0;
-				Uart.parityBits = 0;
 				Uart.nOutOfCnt = 0;
 				Uart.OutOfCnt = 4; // Start at 1/4, could switch to 1/256
 				Uart.dropPosition = 0;
@@ -351,7 +338,6 @@ static struct {
     int     bitCount;
     int     posCount;
 	int     syncBit;
-	int     parityBits;
     uint16_t    shiftReg;
 	int     buffer;
 	int     buffer2;
@@ -365,7 +351,7 @@ static struct {
 		SUB_SECOND_HALF,
 		SUB_BOTH
 	}		sub;
-    uint8_t   *output;
+    uint8_t *output;
 } Demod;
 
 static RAMFUNC int ManchesterDecoding(int v)
@@ -418,7 +404,6 @@ static RAMFUNC int ManchesterDecoding(int v)
 			Demod.sub = SUB_FIRST_HALF;
 			Demod.bitCount = 0;
 			Demod.shiftReg = 0;
-			Demod.parityBits = 0;
 			Demod.samples = 0;
 			if(Demod.posCount) {
 				//if(trigger) LED_A_OFF();  // Not useful in this case...
@@ -448,7 +433,6 @@ static RAMFUNC int ManchesterDecoding(int v)
 	else {
 		modulation = bit & Demod.syncBit;
 		modulation |= ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
-		//modulation = ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
 
 		Demod.samples += 4;
 
@@ -483,8 +467,6 @@ static RAMFUNC int ManchesterDecoding(int v)
 				if(Demod.state == DEMOD_SOF_COMPLETE) {
 					Demod.output[Demod.len] = 0x0f;
 					Demod.len++;
-					Demod.parityBits <<= 1;
-					Demod.parityBits ^= OddByteParity[0x0f];
 					Demod.state = DEMOD_UNSYNCD;
 //					error = 0x0f;
 					return TRUE;
@@ -565,11 +547,9 @@ static RAMFUNC int ManchesterDecoding(int v)
 					// Tag response does not need to be a complete byte!
 					if(Demod.len > 0 || Demod.bitCount > 0) {
 						if(Demod.bitCount > 1) {  // was > 0, do not interpret last closing bit, is part of EOF
-							Demod.shiftReg >>= (9 - Demod.bitCount);
+							Demod.shiftReg >>= (9 - Demod.bitCount);	// right align data
 							Demod.output[Demod.len] = Demod.shiftReg & 0xff;
 							Demod.len++;
-							// No parity bit, so just shift a 0
-							Demod.parityBits <<= 1;
 						}
 
 						Demod.state = DEMOD_UNSYNCD;
@@ -606,11 +586,6 @@ static RAMFUNC int ManchesterDecoding(int v)
 				Demod.shiftReg >>= 1;
 				Demod.output[Demod.len] = (Demod.shiftReg & 0xff);
 				Demod.len++;
-
-				// FOR ISO15639 PARITY NOT SEND OTA, JUST CALCULATE IT FOR THE CLIENT
-				Demod.parityBits <<= 1;
-				Demod.parityBits ^= OddByteParity[(Demod.shiftReg & 0xff)];
-
 				Demod.bitCount = 0;
 				Demod.shiftReg = 0;
 			}
@@ -667,8 +642,10 @@ void RAMFUNC SnoopIClass(void)
 	// So 32 should be enough!
 	uint8_t *readerToTagCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
     // The response (tag -> reader) that we're receiving.
-	uint8_t *tagToReaderResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET);
-
+	uint8_t *tagToReaderResponse = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
+	
+    FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+ 
     // reset traceLen to 0
     iso14a_set_tracing(TRUE);
     iso14a_clear_trace();
@@ -765,10 +742,10 @@ void RAMFUNC SnoopIClass(void)
 
 			//if(!LogTrace(Uart.output,Uart.byteCnt, rsamples, Uart.parityBits,TRUE)) break;
 			//if(!LogTrace(NULL, 0, Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, 0, TRUE)) break;
-			if(tracing)
-			{
-				LogTrace(Uart.output,Uart.byteCnt, (GetCountSspClk()-time_0) << 4, Uart.parityBits,TRUE);
-				LogTrace(NULL, 0, (GetCountSspClk()-time_0) << 4, 0, TRUE);
+			if(tracing)	{
+				uint8_t parity[MAX_PARITY_SIZE];
+				GetParity(Uart.output, Uart.byteCnt, parity);
+				LogTrace(Uart.output,Uart.byteCnt, (GetCountSspClk()-time_0) << 4, (GetCountSspClk()-time_0) << 4, parity, TRUE);
 			}
 
 
@@ -789,10 +766,10 @@ void RAMFUNC SnoopIClass(void)
 		    rsamples = samples - Demod.samples;
 		    LED_B_ON();
 
-			if(tracing)
-			{
-				LogTrace(Demod.output,Demod.len, (GetCountSspClk()-time_0) << 4 , Demod.parityBits,FALSE);
-				LogTrace(NULL, 0, (GetCountSspClk()-time_0) << 4, 0, FALSE);
+			if(tracing)	{
+				uint8_t parity[MAX_PARITY_SIZE];
+				GetParity(Demod.output, Demod.len, parity);
+				LogTrace(Demod.output, Demod.len, (GetCountSspClk()-time_0) << 4, (GetCountSspClk()-time_0) << 4, parity, FALSE);
 			}
 
 
@@ -864,10 +841,7 @@ static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
         }
         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
             uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-			/*if(OutOfNDecoding((b & 0xf0) >> 4)) {
-				*len = Uart.byteCnt;
-				return TRUE;
-			}*/
+
 			if(OutOfNDecoding(b & 0x0f)) {
 				*len = Uart.byteCnt;
 				return TRUE;
@@ -954,7 +928,7 @@ static void CodeIClassTagSOF()
 	// Convert from last byte pos to length
 	ToSendMax++;
 }
-
+int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf);
 /**
  * @brief SimulateIClass simulates an iClass card.
  * @param arg0 type of simulation
@@ -971,43 +945,49 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
 {
 	uint32_t simType = arg0;
 	uint32_t numberOfCSNS = arg1;
+	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 
 	// Enable and clear the trace
 	iso14a_set_tracing(TRUE);
 	iso14a_clear_trace();
 
 	uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
-
 	if(simType == 0) {
 		// Use the CSN from commandline
 		memcpy(csn_crc, datain, 8);
-		doIClassSimulation(csn_crc,0);
+		doIClassSimulation(csn_crc,0,NULL);
 	}else if(simType == 1)
 	{
-		doIClassSimulation(csn_crc,0);
+		doIClassSimulation(csn_crc,0,NULL);
 	}
 	else if(simType == 2)
 	{
-		Dbprintf("Going into attack mode");
+
+		uint8_t mac_responses[64] = { 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.
-		for(int i = 0 ; i < numberOfCSNS && i*8+8 < USB_CMD_DATA_SIZE; i++)
+		int i = 0;
+		for( ; i < numberOfCSNS && i*8+8 < USB_CMD_DATA_SIZE; i++)
 		{
 			// The usb data is 512 bytes, fitting 65 8-byte CSNs in there.
 
 			memcpy(csn_crc, datain+(i*8), 8);
-			if(doIClassSimulation(csn_crc,1))
+			if(doIClassSimulation(csn_crc,1,mac_responses+i*8))
 			{
 				return; // Button pressed
 			}
 		}
+		cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);
+
 	}
 	else{
 		// We may want a mode here where we hardcode the csns to use (from proxclone).
 		// That will speed things up a little, but not required just yet.
 		Dbprintf("The mode is not implemented, reserved for future use");
 	}
+	Dbprintf("Done...");
 
 }
 /**
@@ -1015,9 +995,8 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
  * @param csn - csn to use
  * @param breakAfterMacReceived if true, returns after reader MAC has been received.
  */
-int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived)
+int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf)
 {
-
 	// CSN followed by two CRC bytes
 	uint8_t response2[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 	uint8_t response3[] = { 0,0,0,0,0,0,0,0,0,0};
@@ -1068,7 +1047,7 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived)
 
 	// + 1720..
 	uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
-	memset(receivedCmd, 0x44, RECV_CMD_SIZE);
+	memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
 	int len;
 
 	// Prepare card messages
@@ -1092,10 +1071,11 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived)
 
 
 	// Start from off (no field generated)
-	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-	SpinDelay(200);
-
-
+	//FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+	//SpinDelay(200);
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
+	SpinDelay(100);
+	StartCountSspClk();
 	// We need to listen to the high-frequency, peak-detected path.
 	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 	FpgaSetupSsc();
@@ -1107,10 +1087,14 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived)
 	uint32_t r2t_time =0;
 
 	LED_A_ON();
-	bool displayDebug = true;
 	bool buttonPressed = false;
+
+	/** Hack  for testing
+	memcpy(reader_mac_buf,csn,8);
+	exitLoop = true;
+	end hack **/
+
 	while(!exitLoop) {
-		displayDebug = true;
 
 		LED_B_OFF();
 		//Signal tracer
@@ -1131,13 +1115,11 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived)
 			resp = resp1; respLen = resp1Len; //order = 1;
 			respdata = &sof;
 			respsize = sizeof(sof);
-			displayDebug = false;
 		} else if(receivedCmd[0] == 0x0c) {
 			// Reader asks for anticollission CSN
 			resp = resp2; respLen = resp2Len; //order = 2;
 			respdata = response2;
 			respsize = sizeof(response2);
-			//displayDebug = false;
 			//DbpString("Reader requests anticollission CSN:");
 		} else if(receivedCmd[0] == 0x81) {
 			// Reader selects anticollission CSN.
@@ -1155,18 +1137,22 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived)
 		} else if(receivedCmd[0] == 0x05) {
 			// Reader random and reader MAC!!!
 			// Do not respond
-			// We do not know what to answer, so lets keep quit
+            // We do not know what to answer, so lets keep quiet
 			resp = resp1; respLen = 0; //order = 5;
 			respdata = NULL;
 			respsize = 0;
 			if (breakAfterMacReceived){
-				// TODO, actually return this to the caller instead of just
 				// dbprintf:ing ...
-				Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x");
+				Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x"
+						   ,csn[0],csn[1],csn[2],csn[3],csn[4],csn[5],csn[6],csn[7]);
 				Dbprintf("RDR:  (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",len,
-						 receivedCmd[0], receivedCmd[1], receivedCmd[2],
+						receivedCmd[0], receivedCmd[1], receivedCmd[2],
 						receivedCmd[3], receivedCmd[4], receivedCmd[5],
 						receivedCmd[6], receivedCmd[7], receivedCmd[8]);
+				if (reader_mac_buf != NULL)
+				{
+					memcpy(reader_mac_buf,receivedCmd+1,8);
+				}
 				exitLoop = true;
 			}
 		} else if(receivedCmd[0] == 0x00 && len == 1) {
@@ -1190,7 +1176,7 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived)
 
 		if(cmdsRecvd >  100) {
 			//DbpString("100 commands later...");
-			break;
+			//break;
 		}
 		else {
 			cmdsRecvd++;
@@ -1199,33 +1185,16 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived)
 		if(respLen > 0) {
 			SendIClassAnswer(resp, respLen, 21);
 			t2r_time = GetCountSspClk();
-
-//			}
-			if(displayDebug) Dbprintf("R2T:(len=%d): %x %x %x %x %x %x %x %x %x\nT2R: (total/data =%d/%d): %x %x %x %x %x %x %x %x %x",
-			len,
-			receivedCmd[0], receivedCmd[1], receivedCmd[2],
-			receivedCmd[3], receivedCmd[4], receivedCmd[5],
-			receivedCmd[6], receivedCmd[7], receivedCmd[8],
-			respLen,respsize,
-			resp[0], resp[1], resp[2],
-			resp[3], resp[4], resp[5],
-			resp[6], resp[7], resp[8]);
-
 		}
 
 		if (tracing) {
-			//LogTrace(receivedCmd,len, rsamples, Uart.parityBits, TRUE);
-
-			LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, Uart.parityBits,TRUE);
-			LogTrace(NULL,0, (r2t_time-time_0) << 4, 0,TRUE);
+			uint8_t parity[MAX_PARITY_SIZE];
+			GetParity(receivedCmd, len, parity);
+			LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, (r2t_time-time_0) << 4, parity, TRUE);
 
 			if (respdata != NULL) {
-				//LogTrace(respdata,respsize, rsamples, SwapBits(GetParity(respdata,respsize),respsize), FALSE);
-				//if(!LogTrace(resp,respLen, rsamples,SwapBits(GetParity(respdata,respsize),respsize),FALSE))
-				LogTrace(respdata,respsize, (t2r_time-time_0) << 4,SwapBits(GetParity(respdata,respsize),respsize),FALSE);
-				LogTrace(NULL,0, (t2r_time-time_0) << 4,0,FALSE);
-
-
+				GetParity(respdata, respsize, parity);
+				LogTrace(respdata, respsize, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, FALSE);
 			}
 			if(!tracing) {
 				DbpString("Trace full");
@@ -1233,10 +1202,10 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived)
 			}
 
 		}
-		memset(receivedCmd, 0x44, RECV_CMD_SIZE);
+		memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
 	}
 
-	Dbprintf("%x", cmdsRecvd);
+	//Dbprintf("%x", cmdsRecvd);
 	LED_A_OFF();
 	LED_B_OFF();
 	if(buttonPressed)
@@ -1294,20 +1263,23 @@ static void TransmitIClassCommand(const uint8_t *cmd, int len, int *samples, int
   FpgaSetupSsc();
 
    if (wait)
-    if(*wait < 10)
-      *wait = 10;
+   {
+     if(*wait < 10) *wait = 10;
+     
+     for(c = 0; c < *wait;) {
+       if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+         AT91C_BASE_SSC->SSC_THR = 0x00;		// For exact timing!
+         c++;
+       }
+       if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+         volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
+         (void)r;
+       }
+       WDT_HIT();
+     }
+
+   }
 
-  for(c = 0; c < *wait;) {
-    if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
-      AT91C_BASE_SSC->SSC_THR = 0x00;		// For exact timing!
-      c++;
-    }
-    if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-      volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
-      (void)r;
-    }
-    WDT_HIT();
-  }
 
   uint8_t sendbyte;
   bool firstpart = TRUE;
@@ -1387,21 +1359,23 @@ void CodeIClassCommand(const uint8_t * cmd, int len)
 
 void ReaderTransmitIClass(uint8_t* frame, int len)
 {
-  int wait = 0;
-  int samples = 0;
-  int par = 0;
-
-  // This is tied to other size changes
-  // 	uint8_t* frame_addr = ((uint8_t*)BigBuf) + 2024;
-  CodeIClassCommand(frame,len);
-
-  // Select the card
-  TransmitIClassCommand(ToSend, ToSendMax, &samples, &wait);
-  if(trigger)
-  	LED_A_ON();
-
-  // Store reader command in buffer
-  if (tracing) LogTrace(frame,len,rsamples,par,TRUE);
+	int wait = 0;
+	int samples = 0;
+
+	// This is tied to other size changes
+	CodeIClassCommand(frame,len);
+
+	// Select the card
+	TransmitIClassCommand(ToSend, ToSendMax, &samples, &wait);
+	if(trigger)
+		LED_A_ON();
+
+	// Store reader command in buffer
+	if (tracing) {
+		uint8_t par[MAX_PARITY_SIZE];
+		GetParity(frame, len, par);
+		LogTrace(frame, len, rsamples, rsamples, par, TRUE);
+	}
 }
 
 //-----------------------------------------------------------------------------
@@ -1443,10 +1417,7 @@ static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples,
 			b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
 			skip = !skip;
 			if(skip) continue;
-			/*if(ManchesterDecoding((b>>4) & 0xf)) {
-				*samples = ((c - 1) << 3) + 4;
-				return TRUE;
-			}*/
+		
 			if(ManchesterDecoding(b & 0x0f)) {
 				*samples = c << 3;
 				return  TRUE;
@@ -1460,21 +1431,315 @@ int ReaderReceiveIClass(uint8_t* receivedAnswer)
   int samples = 0;
   if (!GetIClassAnswer(receivedAnswer,160,&samples,0)) return FALSE;
   rsamples += samples;
-  if (tracing) LogTrace(receivedAnswer,Demod.len,rsamples,Demod.parityBits,FALSE);
+  if (tracing) {
+	uint8_t parity[MAX_PARITY_SIZE];
+	GetParity(receivedAnswer, Demod.len, parity);
+	LogTrace(receivedAnswer,Demod.len,rsamples,rsamples,parity,FALSE);
+  }
   if(samples == 0) return FALSE;
   return Demod.len;
 }
 
+void setupIclassReader()
+{
+    FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+    // Reset trace buffer
+    iso14a_set_tracing(TRUE);
+    iso14a_clear_trace();
+
+    // Setup SSC
+    FpgaSetupSsc();
+    // Start from off (no field generated)
+    // Signal field is off with the appropriate LED
+    LED_D_OFF();
+    FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+    SpinDelay(200);
+
+    SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+
+    // Now give it time to spin up.
+    // Signal field is on with the appropriate LED
+    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
+    SpinDelay(200);
+    LED_A_ON();
+
+}
+
+size_t sendCmdGetResponseWithRetries(uint8_t* command, size_t cmdsize, uint8_t* resp, uint8_t expected_size, uint8_t retries)
+{
+	while(retries-- > 0)
+	{
+		ReaderTransmitIClass(command, cmdsize);
+		if(expected_size == ReaderReceiveIClass(resp)){
+			return 0;
+		}
+	}
+	return 1;//Error
+}
+
+/**
+ * @brief Talks to an iclass tag, sends the commands to get CSN and CC.
+ * @param card_data where the CSN and CC are stored for return
+ * @return 0 = fail
+ *         1 = Got CSN
+ *         2 = Got CSN and CC
+ */
+uint8_t handshakeIclassTag(uint8_t *card_data)
+{
+	static uint8_t act_all[]     = { 0x0a };
+	static uint8_t identify[]    = { 0x0c };
+	static uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+	static uint8_t readcheck_cc[]= { 0x88, 0x02 };
+	uint8_t *resp = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
+
+	uint8_t read_status = 0;
+
+	// Send act_all
+	ReaderTransmitIClass(act_all, 1);
+	// Card present?
+	if(!ReaderReceiveIClass(resp)) return read_status;//Fail
+	//Send Identify
+	ReaderTransmitIClass(identify, 1);
+	//We expect a 10-byte response here, 8 byte anticollision-CSN and 2 byte CRC
+	uint8_t len  = ReaderReceiveIClass(resp);
+	if(len != 10) return read_status;//Fail
+
+	//Copy the Anti-collision CSN to our select-packet
+	memcpy(&select[1],resp,8);
+	//Select the card
+	ReaderTransmitIClass(select, sizeof(select));
+	//We expect a 10-byte response here, 8 byte CSN and 2 byte CRC
+	len  = ReaderReceiveIClass(resp);
+	if(len != 10) return read_status;//Fail
+
+	//Success - level 1, we got CSN
+	//Save CSN in response data
+	memcpy(card_data,resp,8);
+
+	//Flag that we got to at least stage 1, read CSN
+	read_status = 1;
+
+	// Card selected, now read e-purse (cc)
+	ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
+	if(ReaderReceiveIClass(resp) == 8) {
+		//Save CC (e-purse) in response data
+		memcpy(card_data+8,resp,8);
+
+		//Got both
+		read_status = 2;
+	}
+
+	return read_status;
+}
+
 // Reader iClass Anticollission
 void ReaderIClass(uint8_t arg0) {
+
+    uint8_t card_data[24]={0};
+    uint8_t last_csn[8]={0};
+	
+    int read_status= 0;
+    bool abort_after_read = arg0 & FLAG_ICLASS_READER_ONLY_ONCE;
+	bool get_cc = arg0 & FLAG_ICLASS_READER_GET_CC;
+
+    setupIclassReader();
+
+    size_t datasize = 0;
+    while(!BUTTON_PRESS())
+    {
+
+		if(traceLen > TRACE_SIZE) {
+			DbpString("Trace full");
+			break;
+		}
+		WDT_HIT();
+
+		read_status = handshakeIclassTag(card_data);
+
+		if(read_status == 0) continue;
+		if(read_status == 1) datasize = 8;
+		if(read_status == 2) datasize = 16;
+
+		LED_B_ON();
+		//Send back to client, but don't bother if we already sent this
+		if(memcmp(last_csn, card_data, 8) != 0)
+		{
+
+			if(!get_cc || (get_cc && read_status == 2))
+			{
+				cmd_send(CMD_ACK,read_status,0,0,card_data,datasize);
+				if(abort_after_read) {
+					LED_A_OFF();
+					return;
+				}
+				//Save that we already sent this....
+				memcpy(last_csn, card_data, 8);
+			}
+			//If 'get_cc' was specified and we didn't get a CC, we'll just keep trying...
+		}
+		LED_B_OFF();
+    }
+    cmd_send(CMD_ACK,0,0,0,card_data, 0);
+    LED_A_OFF();
+}
+
+void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
+
+	uint8_t card_data[USB_CMD_DATA_SIZE]={0};
+	uint16_t block_crc_LUT[255] = {0};
+
+	{//Generate a lookup table for block crc
+		for(int block = 0; block < 255; block++){
+			char bl = block;
+			block_crc_LUT[block] = iclass_crc16(&bl ,1);
+		}
+	}
+	//Dbprintf("Lookup table: %02x %02x %02x" ,block_crc_LUT[0],block_crc_LUT[1],block_crc_LUT[2]);
+
+	uint8_t check[]       = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+	uint8_t read[]        = { 0x0c, 0x00, 0x00, 0x00 };
+	
+    uint16_t crc = 0;
+	uint8_t cardsize=0;
+	uint8_t mem=0;
+	
+	static struct memory_t{
+	  int k16;
+	  int book;
+	  int k2;
+	  int lockauth;
+	  int keyaccess;
+	} memory;
+	
+	uint8_t* resp = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
+	
+    setupIclassReader();
+
+
+	while(!BUTTON_PRESS()) {
+	
+		WDT_HIT();
+
+		if(traceLen > TRACE_SIZE) {
+			DbpString("Trace full");
+			break;
+		}
+		
+		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;
+		}
+
+		mem=resp[5];
+		memory.k16= (mem & 0x80);
+		memory.book= (mem & 0x20);
+		memory.k2= (mem & 0x8);
+		memory.lockauth= (mem & 0x2);
+		memory.keyaccess= (mem & 0x1);
+
+		cardsize = memory.k16 ? 255 : 32;
+		WDT_HIT();
+		//Set card_data to all zeroes, we'll fill it with data
+		memset(card_data,0x0,USB_CMD_DATA_SIZE);
+		uint8_t failedRead =0;
+		uint8_t stored_data_length =0;
+		//then loop around remaining blocks
+		for(int block=0; block < cardsize; block++){
+
+			read[1]= block;
+			crc = block_crc_LUT[block];
+			read[2] = crc >> 8;
+			read[3] = crc & 0xff;
+
+			if(!sendCmdGetResponseWithRetries(read, sizeof(read), resp, 10, 10))
+			{
+				Dbprintf("     %02x: %02x %02x %02x %02x %02x %02x %02x %02x",
+						 block, resp[0], resp[1], resp[2],
+						resp[3], resp[4], resp[5],
+						resp[6], resp[7]);
+
+				//Fill up the buffer
+				memcpy(card_data+stored_data_length,resp,8);
+				stored_data_length += 8;
+
+				if(stored_data_length +8 > USB_CMD_DATA_SIZE)
+				{//Time to send this off and start afresh
+					cmd_send(CMD_ACK,
+							 stored_data_length,//data length
+							 failedRead,//Failed blocks?
+							 0,//Not used ATM
+							 card_data, stored_data_length);
+					//reset
+					stored_data_length = 0;
+					failedRead = 0;
+				}
+
+			}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;
+	}
+	//Signal end of transmission
+	cmd_send(CMD_ACK,
+			 0,//data length
+			 0,//Failed blocks?
+			 0,//Not used ATM
+			 card_data, 0);
+
+	LED_A_OFF();
+}
+
+//2. Create Read method (cut-down from above) based off responses from 1. 
+//   Since we have the MAC could continue to use replay function.
+//3. Create Write method
+/*
+void IClass_iso14443A_write(uint8_t arg0, uint8_t blockNo, uint8_t *data, uint8_t *MAC) {
 	uint8_t act_all[]     = { 0x0a };
 	uint8_t identify[]    = { 0x0c };
 	uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
-
-	uint8_t* resp = (((uint8_t *)BigBuf) + 3560);	// was 3560 - tied to other size changes
+	uint8_t readcheck_cc[]= { 0x88, 0x02 };
+	uint8_t check[]       = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+	uint8_t read[]        = { 0x0c, 0x00, 0x00, 0x00 };
+	uint8_t write[]       = { 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+	
+    uint16_t crc = 0;
+	
+	uint8_t* resp = (((uint8_t *)BigBuf) + 3560);
 
 	// Reset trace buffer
-	memset(trace, 0x44, RECV_CMD_OFFSET);
+    memset(trace, 0x44, RECV_CMD_OFFSET);
 	traceLen = 0;
 
 	// Setup SSC
@@ -1494,7 +1759,7 @@ void ReaderIClass(uint8_t arg0) {
 
 	LED_A_ON();
 
-	for(;;) {
+	for(int i=0;i<1;i++) {
 	
 		if(traceLen > TRACE_SIZE) {
 			DbpString("Trace full");
@@ -1519,13 +1784,67 @@ void ReaderIClass(uint8_t arg0) {
 					resp[3], resp[4], resp[5],
 					resp[6], resp[7]);
 				}
-				// Card selected, whats next... ;-)
-			}
+				// Card selected
+				Dbprintf("Readcheck on Sector 2");
+				ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
+				if(ReaderReceiveIClass(resp) == 8) {
+				   Dbprintf("     CC: %02x %02x %02x %02x %02x %02x %02x %02x",
+					resp[0], resp[1], resp[2],
+					resp[3], resp[4], resp[5],
+					resp[6], resp[7]);
+				}else return;
+				Dbprintf("Authenticate");
+				//for now replay captured auth (as cc not updated)
+				memcpy(check+5,MAC,4);
+				Dbprintf("     AA: %02x %02x %02x %02x",
+					check[5], check[6], check[7],check[8]);
+				ReaderTransmitIClass(check, sizeof(check));
+				if(ReaderReceiveIClass(resp) == 4) {
+				   Dbprintf("     AR: %02x %02x %02x %02x",
+					resp[0], resp[1], resp[2],resp[3]);
+				}else {
+				  Dbprintf("Error: Authentication Fail!");
+				  return;
+				}
+				Dbprintf("Write Block");
+				
+				//read configuration for max block number
+				read_success=false;
+				read[1]=1;
+				uint8_t *blockno=&read[1];
+				crc = iclass_crc16((char *)blockno,1);
+				read[2] = crc >> 8;
+				read[3] = crc & 0xff;
+				while(!read_success){
+				      ReaderTransmitIClass(read, sizeof(read));
+				      if(ReaderReceiveIClass(resp) == 10) {
+					 read_success=true;
+					 mem=resp[5];
+					 memory.k16= (mem & 0x80);
+					 memory.book= (mem & 0x20);
+					 memory.k2= (mem & 0x8);
+					 memory.lockauth= (mem & 0x2);
+					 memory.keyaccess= (mem & 0x1);
+
+				      }
+				}
+				if (memory.k16){
+				  cardsize=255;
+				}else cardsize=32;
+				//check card_size
+				
+				memcpy(write+1,blockNo,1);
+				memcpy(write+2,data,8);
+				memcpy(write+10,mac,4);
+				while(!send_success){
+				  ReaderTransmitIClass(write, sizeof(write));
+				  if(ReaderReceiveIClass(resp) == 10) {
+				    write_success=true;
+				}
+			}//
 		}
 		WDT_HIT();
 	}
 	
 	LED_A_OFF();
-}
-
-
+}*/