X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/3fe4ff4f0329d6bde9585b77966d42dfc3f612f5..078e2bd238dfddb39c33de775f5e0a68657c4504:/armsrc/iclass.c?ds=inline

diff --git a/armsrc/iclass.c b/armsrc/iclass.c
index 625cf39b..f9aedc95 100644
--- a/armsrc/iclass.c
+++ b/armsrc/iclass.c
@@ -42,11 +42,15 @@
 #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"
 #include "iso15693tools.h"
+#include "protocols.h"
+#include "optimized_cipher.h"
+#include "usb_cdc.h" // for usb_poll_validate_length
 
 static int timeout = 4096;
 
@@ -640,21 +644,24 @@ void RAMFUNC SnoopIClass(void)
     // The command (reader -> tag) that we're receiving.
 	// The length of a received command will in most cases be no more than 18 bytes.
 	// So 32 should be enough!
-	uint8_t *readerToTagCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
+	#define ICLASS_BUFFER_SIZE 32
+	uint8_t readerToTagCmd[ICLASS_BUFFER_SIZE];
     // The response (tag -> reader) that we're receiving.
-	uint8_t *tagToReaderResponse = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
+	uint8_t tagToReaderResponse[ICLASS_BUFFER_SIZE];
 	
     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
  
-    // reset traceLen to 0
-    iso14a_set_tracing(TRUE);
-    iso14a_clear_trace();
+ 	// free all BigBuf memory
+	BigBuf_free();
+    // The DMA buffer, used to stream samples from the FPGA
+    uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
+ 
+	set_tracing(TRUE);
+	clear_trace();
     iso14a_set_trigger(FALSE);
 
-    // The DMA buffer, used to stream samples from the FPGA
-    int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
-    int lastRxCounter;
-    int8_t *upTo;
+	int lastRxCounter;
+    uint8_t *upTo;
     int smpl;
     int maxBehindBy = 0;
 
@@ -687,7 +694,8 @@ void RAMFUNC SnoopIClass(void)
     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;
@@ -702,7 +710,7 @@ void RAMFUNC SnoopIClass(void)
                                 (DMA_BUFFER_SIZE-1);
         if(behindBy > maxBehindBy) {
             maxBehindBy = behindBy;
-            if(behindBy > 400) {
+            if(behindBy > (9 * DMA_BUFFER_SIZE / 10)) {
                 Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
                 goto done;
             }
@@ -738,6 +746,7 @@ void RAMFUNC SnoopIClass(void)
 		smpl = decbyter;	
 		if(OutOfNDecoding((smpl & 0xF0) >> 4)) {
 		    rsamples = samples - Uart.samples;
+			time_stop = (GetCountSspClk()-time_0) << 4;
 		    LED_C_ON();
 
 			//if(!LogTrace(Uart.output,Uart.byteCnt, rsamples, Uart.parityBits,TRUE)) break;
@@ -745,7 +754,7 @@ void RAMFUNC SnoopIClass(void)
 			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);
+				LogTrace(Uart.output,Uart.byteCnt, time_start, time_stop, parity, TRUE);
 			}
 
 
@@ -756,6 +765,8 @@ void RAMFUNC SnoopIClass(void)
 		    Demod.state = DEMOD_UNSYNCD;
 		    LED_B_OFF();
 		    Uart.byteCnt = 0;
+		}else{
+			time_start = (GetCountSspClk()-time_0) << 4;
 		}
 		decbyter = 0;
 	}
@@ -763,21 +774,24 @@ void RAMFUNC SnoopIClass(void)
 	if(div > 3) {
 		smpl = decbyte;
 		if(ManchesterDecoding(smpl & 0x0F)) {
-		    rsamples = samples - Demod.samples;
+			time_stop = (GetCountSspClk()-time_0) << 4;
+
+			rsamples = samples - Demod.samples;
 		    LED_B_ON();
 
 			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);
+				LogTrace(Demod.output, Demod.len, time_start, time_stop, parity, FALSE);
 			}
 
-
 		    // And ready to receive another response.
 		    memset(&Demod, 0, sizeof(Demod));
 			Demod.output = tagToReaderResponse;
 		    Demod.state = DEMOD_UNSYNCD;
 		    LED_C_OFF();
+		}else{
+			time_start = (GetCountSspClk()-time_0) << 4;
 		}
 		
 		div = 0;
@@ -794,12 +808,12 @@ void RAMFUNC SnoopIClass(void)
     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);
-    Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
+	Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);
     LED_A_OFF();
     LED_B_OFF();
     LED_C_OFF();
@@ -850,57 +864,93 @@ static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
     }
 }
 
+static uint8_t encode4Bits(const uint8_t b)
+{
+	uint8_t c = b & 0xF;
+	// OTA, the least significant bits first
+	//         The columns are
+	//               1 - Bit value to send
+	//               2 - Reversed (big-endian)
+	//               3 - Encoded
+	//               4 - Hex values
+
+	switch(c){
+	//                          1       2         3         4
+	  case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55
+	  case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95
+	  case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65
+	  case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5
+	  case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59
+	  case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99
+	  case 9:  return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69
+	  case 8:  return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9
+	  case 7:  return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56
+	  case 6:  return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96
+	  case 5:  return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66
+	  case 4:  return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6
+	  case 3:  return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a
+	  case 2:  return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a
+	  case 1:  return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a
+	  default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa
+
+	}
+}
 
 //-----------------------------------------------------------------------------
 // Prepare tag messages
 //-----------------------------------------------------------------------------
 static void CodeIClassTagAnswer(const uint8_t *cmd, int len)
 {
-	//So far a dummy implementation, not used
-	//int lastProxToAirDuration =0;
+
+	/*
+	 * SOF comprises 3 parts;
+	 * * An unmodulated time of 56.64 us
+	 * * 24 pulses of 423.75 KHz (fc/32)
+	 * * A logic 1, which starts with an unmodulated time of 18.88us
+	 *   followed by 8 pulses of 423.75kHz (fc/32)
+	 *
+	 *
+	 * EOF comprises 3 parts:
+	 * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated
+	 *   time of 18.88us.
+	 * - 24 pulses of fc/32
+	 * - An unmodulated time of 56.64 us
+	 *
+	 *
+	 * A logic 0 starts with 8 pulses of fc/32
+	 * followed by an unmodulated time of 256/fc (~18,88us).
+	 *
+	 * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by
+	 * 8 pulses of fc/32 (also 18.88us)
+	 *
+	 * The mode FPGA_HF_SIMULATOR_MODULATE_424K_8BIT which we use to simulate tag,
+	 * works like this.
+	 * - A 1-bit input to the FPGA becomes 8 pulses on 423.5kHz (fc/32) (18.88us).
+	 * - A 0-bit inptu to the FPGA becomes an unmodulated time of 18.88us
+	 *
+	 * In this mode the SOF can be written as 00011101 = 0x1D
+	 * The EOF can be written as 10111000 = 0xb8
+	 * A logic 1 is 01
+	 * A logic 0 is 10
+	 *
+	 * */
+
 	int i;
 
 	ToSendReset();
 
 	// Send SOF
-	ToSend[++ToSendMax] = 0x00;
-	ToSend[++ToSendMax] = 0x00;
-	ToSend[++ToSendMax] = 0x00;
-	ToSend[++ToSendMax] = 0xff;//Proxtoair duration starts here
-	ToSend[++ToSendMax] = 0xff;
-	ToSend[++ToSendMax] = 0xff;
-	ToSend[++ToSendMax] = 0x00;
-	ToSend[++ToSendMax] = 0xff;
+	ToSend[++ToSendMax] = 0x1D;
 
 	for(i = 0; i < len; i++) {
-		int j;
 		uint8_t b = cmd[i];
-
-		// Data bits
-		for(j = 0; j < 8; j++) {
-			if(b & 1) {
-				ToSend[++ToSendMax] = 0x00;
-				ToSend[++ToSendMax] = 0xff;
-			} else {
-				ToSend[++ToSendMax] = 0xff;
-				ToSend[++ToSendMax] = 0x00;
-			}
-			b >>= 1;
-		}
+		ToSend[++ToSendMax] = encode4Bits(b & 0xF); //Least significant half
+		ToSend[++ToSendMax] = encode4Bits((b >>4) & 0xF);//Most significant half
 	}
 
 	// Send EOF
-	ToSend[++ToSendMax] = 0xff;
-	ToSend[++ToSendMax] = 0x00;
-	ToSend[++ToSendMax] = 0xff;
-	ToSend[++ToSendMax] = 0xff;
-	ToSend[++ToSendMax] = 0xff;	
-	ToSend[++ToSendMax] = 0x00;
-	ToSend[++ToSendMax] = 0x00;
-	ToSend[++ToSendMax] = 0x00;
-
+	ToSend[++ToSendMax] = 0xB8;
 	//lastProxToAirDuration  = 8*ToSendMax - 3*8 - 3*8;//Not counting zeroes in the beginning or end
-
 	// Convert from last byte pos to length
 	ToSendMax++;
 }
@@ -913,22 +963,17 @@ static void CodeIClassTagSOF()
 
 	ToSendReset();
 	// Send SOF
-	ToSend[++ToSendMax] = 0x00;
-	ToSend[++ToSendMax] = 0x00;
-	ToSend[++ToSendMax] = 0x00;
-	ToSend[++ToSendMax] = 0xff;
-	ToSend[++ToSendMax] = 0xff;
-	ToSend[++ToSendMax] = 0xff;
-	ToSend[++ToSendMax] = 0x00;
-	ToSend[++ToSendMax] = 0xff;
-
+	ToSend[++ToSendMax] = 0x1D;
 //	lastProxToAirDuration  = 8*ToSendMax - 3*8;//Not counting zeroes in the beginning
 
-	
 	// Convert from last byte pos to length
 	ToSendMax++;
 }
-int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf);
+#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
@@ -948,22 +993,27 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
 	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 
 	// Enable and clear the trace
-	iso14a_set_tracing(TRUE);
-	iso14a_clear_trace();
+	set_tracing(TRUE);
+	clear_trace();
+	//Use the emulator memory for SIM
+	uint8_t *emulator = BigBuf_get_EM_addr();
 
-	uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
 	if(simType == 0) {
 		// Use the CSN from commandline
-		memcpy(csn_crc, datain, 8);
-		doIClassSimulation(csn_crc,0,NULL);
+		memcpy(emulator, datain, 8);
+		doIClassSimulation(MODE_SIM_CSN,NULL);
 	}else if(simType == 1)
 	{
-		doIClassSimulation(csn_crc,0,NULL);
+		//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[64] = { 0 };
+		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
@@ -973,14 +1023,18 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
 		{
 			// The usb data is 512 bytes, fitting 65 8-byte CSNs in there.
 
-			memcpy(csn_crc, datain+(i*8), 8);
-			if(doIClassSimulation(csn_crc,1,mac_responses+i*8))
+			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).
@@ -990,27 +1044,54 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
 	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(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf)
+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 response2[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
-	uint8_t response3[] = { 0,0,0,0,0,0,0,0,0,0};
-	memcpy(response3,csn,sizeof(response3));
+	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]);
-	// e-Purse
-	uint8_t response4[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 
 	// Construct anticollision-CSN
-	rotateCSN(response3,response2);
+	rotateCSN(csn_data,anticoll_data);
 
 	// 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
@@ -1020,34 +1101,32 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
 	// Reader 81 anticoll. CSN
 	// Tag    CSN
 
-	uint8_t *resp;
-	int respLen;
-	uint8_t* respdata = NULL;
-	int respsize = 0;
-	uint8_t sof = 0x0f;
+	uint8_t *modulated_response;
+	int modulated_response_size = 0;
+	uint8_t* trace_data = NULL;
+	int trace_data_size = 0;
+
 
-	// Respond SOF -- takes 8 bytes
-	uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
-	int resp1Len;
+	// Respond SOF -- takes 1 bytes
+	uint8_t *resp_sof = BigBuf_malloc(2);
+	int resp_sof_Len;
 
 	// Anticollision CSN (rotated CSN)
-	// 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit)
-	uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 10);
-	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
-	// 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit)
-	uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 190);
-	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
-	// 144: Takes 16 bytes for SOF/EOF and 8 * 16 = 128 bytes (2 bytes/bit)
-	uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 370);
-	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) + RECV_CMD_OFFSET);
-	memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
+	uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
 	int len;
 
 	// Prepare card messages
@@ -1055,20 +1134,26 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
 
 	// First card answer: SOF
 	CodeIClassTagSOF();
-	memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
+	memcpy(resp_sof, ToSend, ToSendMax); resp_sof_Len = ToSendMax;
 
 	// 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
-	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
-	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);
@@ -1088,14 +1173,9 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
 
 	LED_A_ON();
 	bool buttonPressed = false;
-
-	/** Hack  for testing
-	memcpy(reader_mac_buf,csn,8);
-	exitLoop = true;
-	end hack **/
-
+	uint8_t response_delay = 1;
 	while(!exitLoop) {
-
+		response_delay = 1;
 		LED_B_OFF();
 		//Signal tracer
 		// Can be used to get a trigger for an oscilloscope..
@@ -1110,57 +1190,110 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
 		LED_C_ON();
 
 		// Okay, look at the command now.
-		if(receivedCmd[0] == 0x0a ) {
+		if(receivedCmd[0] == ICLASS_CMD_ACTALL ) {
 			// Reader in anticollission phase
-			resp = resp1; respLen = resp1Len; //order = 1;
-			respdata = &sof;
-			respsize = sizeof(sof);
-		} 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
-			resp = resp2; respLen = resp2Len; //order = 2;
-			respdata = response2;
-			respsize = sizeof(response2);
+			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:");
-		} else if(receivedCmd[0] == 0x81) {
+		} else if(receivedCmd[0] == ICLASS_CMD_SELECT) {
 			// Reader selects anticollission CSN.
 			// Tag sends the corresponding real CSN
-			resp = resp3; respLen = resp3Len; //order = 3;
-			respdata = response3;
-			respsize = sizeof(response3);
+			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:");
-		} else if(receivedCmd[0] == 0x88) {
+		} else if(receivedCmd[0] == ICLASS_CMD_READCHECK_KD) {
 			// Read e-purse (88 02)
-			resp = resp4; respLen = resp4Len; //order = 4;
-			respdata = response4;
-			respsize = sizeof(response4);
+			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();
-		} else if(receivedCmd[0] == 0x05) {
+		} else if(receivedCmd[0] == ICLASS_CMD_CHECK) {
 			// Reader random and reader MAC!!!
-			// Do not respond
-            // We do not know what to answer, so lets keep quiet
-			resp = resp1; respLen = 0; //order = 5;
-			respdata = NULL;
-			respsize = 0;
-			if (breakAfterMacReceived){
-				// dbprintf:ing ...
-				Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x"
-						   ,csn[0],csn[1],csn[2],csn[3],csn[4],csn[5],csn[6],csn[7]);
-				Dbprintf("RDR:  (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",len,
-						receivedCmd[0], receivedCmd[1], receivedCmd[2],
-						receivedCmd[3], receivedCmd[4], receivedCmd[5],
-						receivedCmd[6], receivedCmd[7], receivedCmd[8]);
-				if (reader_mac_buf != NULL)
-				{
-					memcpy(reader_mac_buf,receivedCmd+1,8);
+			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;
 				}
-				exitLoop = true;
 			}
-		} else if(receivedCmd[0] == 0x00 && len == 1) {
+
+		} else if(receivedCmd[0] == ICLASS_CMD_HALT && len == 1) {
 			// Reader ends the session
-			resp = resp1; respLen = 0; //order = 0;
-			respdata = NULL;
-			respsize = 0;
-		} 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",
@@ -1169,9 +1302,9 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
 			receivedCmd[3], receivedCmd[4], receivedCmd[5],
 			receivedCmd[6], receivedCmd[7], receivedCmd[8]);
 			// Do not respond
-			resp = resp1; respLen = 0; //order = 0;
-			respdata = NULL;
-			respsize = 0;
+			modulated_response = resp_sof; modulated_response_size = 0; //order = 0;
+			trace_data = NULL;
+			trace_data_size = 0;
 		}
 
 		if(cmdsRecvd >  100) {
@@ -1181,9 +1314,11 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
 		else {
 			cmdsRecvd++;
 		}
-
-		if(respLen > 0) {
-			SendIClassAnswer(resp, respLen, 21);
+		/**
+		A legit tag has about 380us delay between reader EOT and tag SOF.
+		**/
+		if(modulated_response_size > 0) {
+			SendIClassAnswer(modulated_response, modulated_response_size, response_delay);
 			t2r_time = GetCountSspClk();
 		}
 
@@ -1192,9 +1327,9 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
 			GetParity(receivedCmd, len, parity);
 			LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, (r2t_time-time_0) << 4, parity, TRUE);
 
-			if (respdata != NULL) {
-				GetParity(respdata, respsize, parity);
-				LogTrace(respdata, respsize, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, FALSE);
+			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(!tracing) {
 				DbpString("Trace full");
@@ -1202,12 +1337,13 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
 			}
 
 		}
-		memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
 	}
 
 	//Dbprintf("%x", cmdsRecvd);
 	LED_A_OFF();
 	LED_B_OFF();
+	LED_C_OFF();
+
 	if(buttonPressed)
 	{
 		DbpString("Button pressed");
@@ -1220,7 +1356,8 @@ static int SendIClassAnswer(uint8_t *resp, int respLen, int delay)
 	int i = 0, d=0;//, u = 0, d = 0;
 	uint8_t b = 0;
 
-	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
+	//FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K_8BIT);
 
 	AT91C_BASE_SSC->SSC_THR = 0x00;
 	FpgaSetupSsc();
@@ -1244,7 +1381,8 @@ static int SendIClassAnswer(uint8_t *resp, int respLen, int delay)
 			AT91C_BASE_SSC->SSC_THR = b;
 		}
 
-		if (i > respLen +4) break;
+//		if (i > respLen +4) break;
+		if (i > respLen +1) break;
 	}
 
 	return 0;
@@ -1311,7 +1449,7 @@ static void TransmitIClassCommand(const uint8_t *cmd, int len, int *samples, int
     }
     WDT_HIT();
   }
-  if (samples) *samples = (c + *wait) << 3;
+  if (samples && wait) *samples = (c + *wait) << 3;
 }
 
 
@@ -1337,7 +1475,7 @@ void CodeIClassCommand(const uint8_t * cmd, int len)
     for(j = 0; j < 4; j++) {
       for(k = 0; k < 4; k++) {
 			if(k == (b & 3)) {
-				ToSend[++ToSendMax] = 0x0f;
+				ToSend[++ToSendMax] = 0xf0;
 			}
 			else {
 				ToSend[++ToSendMax] = 0x00;
@@ -1444,8 +1582,8 @@ void setupIclassReader()
 {
     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
     // Reset trace buffer
-    iso14a_set_tracing(TRUE);
-    iso14a_clear_trace();
+	  set_tracing(TRUE);
+	  clear_trace();
 
     // Setup SSC
     FpgaSetupSsc();
@@ -1465,16 +1603,16 @@ void setupIclassReader()
 
 }
 
-size_t sendCmdGetResponseWithRetries(uint8_t* command, size_t cmdsize, uint8_t* resp, uint8_t expected_size, uint8_t retries)
+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 0;
+			return true;
 		}
 	}
-	return 1;//Error
+	return false;//Error
 }
 
 /**
@@ -1484,13 +1622,19 @@ size_t sendCmdGetResponseWithRetries(uint8_t* command, size_t cmdsize, uint8_t*
  *         1 = Got CSN
  *         2 = Got CSN and CC
  */
-uint8_t handshakeIclassTag(uint8_t *card_data)
+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 };
+	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 };
-	uint8_t *resp = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
+	if (use_credit_key)
+		readcheck_cc[0] = 0x18;
+	else
+		readcheck_cc[0] = 0x88;
+
+	uint8_t resp[ICLASS_BUFFER_SIZE];
 
 	uint8_t read_status = 0;
 
@@ -1519,73 +1663,137 @@ uint8_t handshakeIclassTag(uint8_t *card_data)
 	//Flag that we got to at least stage 1, read CSN
 	read_status = 1;
 
-	// Card selected, now read e-purse (cc)
+	// 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);
-
-		//Got both
-		read_status = 2;
+		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) {
 
-    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) {
+	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(!tracing) {
 			DbpString("Trace full");
 			break;
 		}
 		WDT_HIT();
 
-		read_status = handshakeIclassTag(card_data);
+		read_status = handshakeIclassTag_ext(card_data, use_credit_key);
 
 		if(read_status == 0) continue;
-		if(read_status == 1) datasize = 8;
-		if(read_status == 2) datasize = 16;
+		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");
+			}
+		}
+
+		//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");
+			}
+		}
+
+		// 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
+		//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(!get_cc || (get_cc && read_status == 2))
-			{
-				cmd_send(CMD_ACK,read_status,0,0,card_data,datasize);
+			// 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);
 			}
-			//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();
+		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();
 }
 
 void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
 
-	uint8_t card_data[24]={0};
+	uint8_t card_data[USB_CMD_DATA_SIZE]={0};
 	uint16_t block_crc_LUT[255] = {0};
 
 	{//Generate a lookup table for block crc
@@ -1611,16 +1819,16 @@ void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
 	  int keyaccess;
 	} memory;
 	
-	uint8_t* resp = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
+	uint8_t resp[ICLASS_BUFFER_SIZE];
 	
     setupIclassReader();
-
+	set_tracing(TRUE);
 
 	while(!BUTTON_PRESS()) {
 	
 		WDT_HIT();
 
-		if(traceLen > TRACE_SIZE) {
+		if(!tracing) {
 			DbpString("Trace full");
 			break;
 		}
@@ -1631,7 +1839,7 @@ void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
 		//for now replay captured auth (as cc not updated)
 		memcpy(check+5,MAC,4);
 
-		if(sendCmdGetResponseWithRetries(check, sizeof(check),resp, 4, 5))
+		if(!sendCmdGetResponseWithRetries(check, sizeof(check),resp, 4, 5))
 		{
 			Dbprintf("Error: Authentication Fail!");
 			continue;
@@ -1643,7 +1851,7 @@ void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
 		read[2] = crc >> 8;
 		read[3] = crc & 0xff;
 
-		if(sendCmdGetResponseWithRetries(read, sizeof(read),resp, 10, 10))
+		if(!sendCmdGetResponseWithRetries(read, sizeof(read),resp, 10, 10))
 		{
 			Dbprintf("Dump config (block 1) failed");
 			continue;
@@ -1658,7 +1866,10 @@ void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
 
 		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++){
 
@@ -1667,148 +1878,188 @@ void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
 			read[2] = crc >> 8;
 			read[3] = crc & 0xff;
 
-			if(!sendCmdGetResponseWithRetries(read, sizeof(read), resp, 10, 10))
+			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 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);
+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);
+}
 
-	// Reset trace buffer
-    memset(trace, 0x44, RECV_CMD_OFFSET);
-	traceLen = 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;
+}
 
-	// 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);
+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);
+}
 
-	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+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");
+		OnError(1);
+		return;
+	}
+	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();
+}
 
-	// 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);
+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;
+}
 
-	LED_A_ON();
+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);	
+}
 
-	for(int i=0;i<1;i++) {
-	
-		if(traceLen > TRACE_SIZE) {
-			DbpString("Trace full");
-			break;
-		}
-		
-		if (BUTTON_PRESS()) break;
-
-		// Send act_all
-		ReaderTransmitIClass(act_all, 1);
-		// Card present?
-		if(ReaderReceiveIClass(resp)) {
-			ReaderTransmitIClass(identify, 1);
-			if(ReaderReceiveIClass(resp) == 10) {
-				// Select card          
-				memcpy(&select[1],resp,8);
-				ReaderTransmitIClass(select, sizeof(select));
-
-				if(ReaderReceiveIClass(resp) == 10) {
-					Dbprintf("     Selected CSN: %02x %02x %02x %02x %02x %02x %02x %02x",
-					resp[0], resp[1], resp[2],
-					resp[3], resp[4], resp[5],
-					resp[6], resp[7]);
-				}
-				// Card selected
-				Dbprintf("Readcheck on Sector 2");
-				ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
-				if(ReaderReceiveIClass(resp) == 8) {
-				   Dbprintf("     CC: %02x %02x %02x %02x %02x %02x %02x %02x",
-					resp[0], resp[1], resp[2],
-					resp[3], resp[4], resp[5],
-					resp[6], resp[7]);
-				}else return;
-				Dbprintf("Authenticate");
-				//for now replay captured auth (as cc not updated)
-				memcpy(check+5,MAC,4);
-				Dbprintf("     AA: %02x %02x %02x %02x",
-					check[5], check[6], check[7],check[8]);
-				ReaderTransmitIClass(check, sizeof(check));
-				if(ReaderReceiveIClass(resp) == 4) {
-				   Dbprintf("     AR: %02x %02x %02x %02x",
-					resp[0], resp[1], resp[2],resp[3]);
-				}else {
-				  Dbprintf("Error: Authentication Fail!");
-				  return;
-				}
-				Dbprintf("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;
-				}
-			}//
+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);
+			}
 		}
-		WDT_HIT();
 	}
-	
-	LED_A_OFF();
-}*/
+	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();
+}