X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/2da2e9283771f20e4fb809709ea1c97c0636e455..e98389b355020a7baa9a82aef200a2a25cc78f47:/armsrc/mifarecmd.c

diff --git a/armsrc/mifarecmd.c b/armsrc/mifarecmd.c
index 939c9002..3854b589 100644
--- a/armsrc/mifarecmd.c
+++ b/armsrc/mifarecmd.c
@@ -14,17 +14,22 @@
 //-----------------------------------------------------------------------------
 
 #include "mifarecmd.h"
+
 #include "apps.h"
 #include "util.h"
+#include "parity.h"
 #include "crc.h"
 
+#define HARDNESTED_AUTHENTICATION_TIMEOUT 848			// card times out 1ms after wrong authentication (according to NXP documentation)
+#define HARDNESTED_PRE_AUTHENTICATION_LEADTIME 400		// some (non standard) cards need a pause after select before they are ready for first authentication 
+
 // the block number for the ISO14443-4 PCB
-uint8_t pcb_blocknum = 0;
+static uint8_t pcb_blocknum = 0;
 // Deselect card by sending a s-block. the crc is precalced for speed
 static  uint8_t deselect_cmd[] = {0xc2,0xe0,0xb4};
 
 //-----------------------------------------------------------------------------
-// Select, Authenticate, Read a MIFARE tag. 
+// Select, Authenticate, Read a MIFARE tag.
 // read block
 //-----------------------------------------------------------------------------
 void MifareReadBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
@@ -34,7 +39,7 @@ void MifareReadBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 	uint8_t keyType = arg1;
 	uint64_t ui64Key = 0;
 	ui64Key = bytes_to_num(datain, 6);
-	
+
 	// variables
 	byte_t isOK = 0;
 	byte_t dataoutbuf[16];
@@ -44,16 +49,16 @@ void MifareReadBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 	struct Crypto1State *pcs;
 	pcs = &mpcs;
 
-	// clear trace
-	clear_trace();
 	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
 
+	clear_trace();
+
 	LED_A_ON();
 	LED_B_OFF();
 	LED_C_OFF();
 
 	while (true) {
-		if(!iso14443a_select_card(uid, NULL, &cuid)) {
+		if(!iso14443a_select_card(uid, NULL, &cuid, true, 0, true)) {
 			if (MF_DBGLEVEL >= 1)	Dbprintf("Can't select card");
 			break;
 		};
@@ -62,7 +67,7 @@ void MifareReadBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 			if (MF_DBGLEVEL >= 1)	Dbprintf("Auth error");
 			break;
 		};
-		
+
 		if(mifare_classic_readblock(pcs, cuid, blockNo, dataoutbuf)) {
 			if (MF_DBGLEVEL >= 1)	Dbprintf("Read block error");
 			break;
@@ -72,14 +77,14 @@ void MifareReadBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 			if (MF_DBGLEVEL >= 1)	Dbprintf("Halt error");
 			break;
 		};
-		
+
 		isOK = 1;
 		break;
 	}
-	
+
 	//  ----------------------------- crypto1 destroy
 	crypto1_destroy(pcs);
-	
+
 	if (MF_DBGLEVEL >= 2)	DbpString("READ BLOCK FINISHED");
 
 	LED_B_ON();
@@ -95,15 +100,17 @@ void MifareUC_Auth(uint8_t arg0, uint8_t *keybytes){
 	bool turnOffField = (arg0 == 1);
 
 	LED_A_ON(); LED_B_OFF(); LED_C_OFF();
-	clear_trace();
+
 	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
 
-	if(!iso14443a_select_card(NULL, NULL, NULL)) {
+	clear_trace();
+
+	if(!iso14443a_select_card(NULL, NULL, NULL, true, 0, true)) {
 		if (MF_DBGLEVEL >= MF_DBG_ERROR) Dbprintf("Can't select card");
 		OnError(0);
 		return;
 	};
-	
+
 	if(!mifare_ultra_auth(keybytes)){
 		if (MF_DBGLEVEL >= MF_DBG_ERROR) Dbprintf("Authentication failed");
 		OnError(1);
@@ -129,10 +136,11 @@ void MifareUReadBlock(uint8_t arg0, uint8_t arg1, uint8_t *datain)
 
 	LEDsoff();
 	LED_A_ON();
-	clear_trace();
 	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
 
-	int len = iso14443a_select_card(NULL, NULL, NULL);
+	clear_trace();
+
+	int len = iso14443a_select_card(NULL, NULL, NULL, true, 0, true);
 	if(!len) {
 		if (MF_DBGLEVEL >= MF_DBG_ERROR) Dbprintf("Can't select card (RC:%02X)",len);
 		OnError(1);
@@ -159,7 +167,7 @@ void MifareUReadBlock(uint8_t arg0, uint8_t arg1, uint8_t *datain)
 			OnError(1);
 			return;
 		}
-	}	
+	}
 
 	if( mifare_ultra_readblock(blockNo, dataout) ) {
 		if (MF_DBGLEVEL >= MF_DBG_ERROR) Dbprintf("Read block error");
@@ -179,7 +187,7 @@ void MifareUReadBlock(uint8_t arg0, uint8_t arg1, uint8_t *datain)
 }
 
 //-----------------------------------------------------------------------------
-// Select, Authenticate, Read a MIFARE tag. 
+// Select, Authenticate, Read a MIFARE tag.
 // read sector (data = 4 x 16 bytes = 64 bytes, or 16 x 16 bytes = 256 bytes)
 //-----------------------------------------------------------------------------
 void MifareReadSector(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
@@ -189,7 +197,7 @@ void MifareReadSector(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 	uint8_t keyType = arg1;
 	uint64_t ui64Key = 0;
 	ui64Key = bytes_to_num(datain, 6);
-	
+
 	// variables
 	byte_t isOK = 0;
 	byte_t dataoutbuf[16 * 16];
@@ -199,27 +207,26 @@ void MifareReadSector(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 	struct Crypto1State *pcs;
 	pcs = &mpcs;
 
-	// clear trace
-	clear_trace();
-
 	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
 
+	clear_trace();
+
 	LED_A_ON();
 	LED_B_OFF();
 	LED_C_OFF();
 
 	isOK = 1;
-	if(!iso14443a_select_card(uid, NULL, &cuid)) {
+	if(!iso14443a_select_card(uid, NULL, &cuid, true, 0, true)) {
 		isOK = 0;
 		if (MF_DBGLEVEL >= 1)	Dbprintf("Can't select card");
 	}
 
-	
+
 	if(isOK && mifare_classic_auth(pcs, cuid, FirstBlockOfSector(sectorNo), keyType, ui64Key, AUTH_FIRST)) {
 		isOK = 0;
 		if (MF_DBGLEVEL >= 1)	Dbprintf("Auth error");
 	}
-	
+
 	for (uint8_t blockNo = 0; isOK && blockNo < NumBlocksPerSector(sectorNo); blockNo++) {
 		if(mifare_classic_readblock(pcs, cuid, FirstBlockOfSector(sectorNo) + blockNo, dataoutbuf + 16 * blockNo)) {
 			isOK = 0;
@@ -227,14 +234,14 @@ void MifareReadSector(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 			break;
 		}
 	}
-		
+
 	if(mifare_classic_halt(pcs, cuid)) {
 		if (MF_DBGLEVEL >= 1)	Dbprintf("Halt error");
 	}
 
 	//  ----------------------------- crypto1 destroy
 	crypto1_destroy(pcs);
-	
+
 	if (MF_DBGLEVEL >= 2) DbpString("READ SECTOR FINISHED");
 
 	LED_B_ON();
@@ -252,6 +259,10 @@ void MifareReadSector(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 // datain = KEY bytes
 void MifareUReadCard(uint8_t arg0, uint16_t arg1, uint8_t arg2, uint8_t *datain)
 {
+	LEDsoff();
+	LED_A_ON();
+	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
+
 	// free eventually allocated BigBuf memory
 	BigBuf_free();
 	clear_trace();
@@ -269,11 +280,7 @@ void MifareUReadCard(uint8_t arg0, uint16_t arg1, uint8_t arg2, uint8_t *datain)
 		return;
 	}
 
-	LEDsoff();
-	LED_A_ON();
-	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
-
-	int len = iso14443a_select_card(NULL, NULL, NULL);
+	int len = iso14443a_select_card(NULL, NULL, NULL, true, 0, true);
 	if (!len) {
 		if (MF_DBGLEVEL >= MF_DBG_ERROR) Dbprintf("Can't select card (RC:%d)",len);
 		OnError(1);
@@ -299,7 +306,7 @@ void MifareUReadCard(uint8_t arg0, uint16_t arg1, uint8_t arg2, uint8_t *datain)
 
 		if (!mifare_ul_ev1_auth(pwd, pack)){
 			OnError(1);
-			return;			
+			return;
 		}
 	}
 
@@ -308,7 +315,7 @@ void MifareUReadCard(uint8_t arg0, uint16_t arg1, uint8_t arg2, uint8_t *datain)
 			Dbprintf("Data exceeds buffer!!");
 			break;
 		}
-	
+
 		len = mifare_ultra_readblock(blockNo + i, dataout + 4 * i);
 
 		if (len) {
@@ -344,7 +351,7 @@ void MifareUReadCard(uint8_t arg0, uint16_t arg1, uint8_t arg2, uint8_t *datain)
 }
 
 //-----------------------------------------------------------------------------
-// Select, Authenticate, Write a MIFARE tag. 
+// Select, Authenticate, Write a MIFARE tag.
 // read block
 //-----------------------------------------------------------------------------
 void MifareWriteBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
@@ -357,7 +364,7 @@ void MifareWriteBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 
 	ui64Key = bytes_to_num(datain, 6);
 	memcpy(blockdata, datain + 10, 16);
-	
+
 	// variables
 	byte_t isOK = 0;
 	uint8_t uid[10];
@@ -366,17 +373,16 @@ void MifareWriteBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 	struct Crypto1State *pcs;
 	pcs = &mpcs;
 
-	// clear trace
-	clear_trace();
-
 	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
 
+	clear_trace();
+
 	LED_A_ON();
 	LED_B_OFF();
 	LED_C_OFF();
 
 	while (true) {
-			if(!iso14443a_select_card(uid, NULL, &cuid)) {
+			if(!iso14443a_select_card(uid, NULL, &cuid, true, 0, true)) {
 			if (MF_DBGLEVEL >= 1)	Dbprintf("Can't select card");
 			break;
 		};
@@ -385,7 +391,7 @@ void MifareWriteBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 			if (MF_DBGLEVEL >= 1)	Dbprintf("Auth error");
 			break;
 		};
-		
+
 		if(mifare_classic_writeblock(pcs, cuid, blockNo, blockdata)) {
 			if (MF_DBGLEVEL >= 1)	Dbprintf("Write block error");
 			break;
@@ -395,14 +401,14 @@ void MifareWriteBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 			if (MF_DBGLEVEL >= 1)	Dbprintf("Halt error");
 			break;
 		};
-		
+
 		isOK = 1;
 		break;
 	}
-	
+
 	//  ----------------------------- crypto1 destroy
 	crypto1_destroy(pcs);
-	
+
 	if (MF_DBGLEVEL >= 2)	DbpString("WRITE BLOCK FINISHED");
 
 	LED_B_ON();
@@ -415,7 +421,7 @@ void MifareWriteBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 	LEDsoff();
 }
 
-/* // Command not needed but left for future testing 
+/* // Command not needed but left for future testing
 void MifareUWriteBlockCompat(uint8_t arg0, uint8_t *datain)
 {
 	uint8_t blockNo = arg0;
@@ -430,7 +436,7 @@ void MifareUWriteBlockCompat(uint8_t arg0, uint8_t *datain)
 	clear_trace();
 	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
 
-	if(!iso14443a_select_card(uid, NULL, NULL)) {
+	if(!iso14443a_select_card(uid, NULL, NULL, true, 0)) {
 		if (MF_DBGLEVEL >= 1)   Dbprintf("Can't select card");
 		OnError(0);
 		return;
@@ -469,13 +475,14 @@ void MifareUWriteBlock(uint8_t arg0, uint8_t arg1, uint8_t *datain)
 	byte_t blockdata[4] = {0x00};
 
 	memcpy(blockdata, datain,4);
-	
+
 	LEDsoff();
 	LED_A_ON();
-	clear_trace();
 	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
 
-	if(!iso14443a_select_card(NULL, NULL, NULL)) {
+	clear_trace();
+
+	if(!iso14443a_select_card(NULL, NULL, NULL, true, 0, true)) {
 		if (MF_DBGLEVEL >= 1) Dbprintf("Can't select card");
 		OnError(0);
 		return;
@@ -491,7 +498,7 @@ void MifareUWriteBlock(uint8_t arg0, uint8_t arg1, uint8_t *datain)
 			return;
 		}
 	}
-	
+
 	// UL-EV1 / NTAG authentication
 	if (usePwd) {
 		uint8_t pwd[4] = {0x00};
@@ -523,17 +530,18 @@ void MifareUWriteBlock(uint8_t arg0, uint8_t arg1, uint8_t *datain)
 }
 
 void MifareUSetPwd(uint8_t arg0, uint8_t *datain){
-	
+
 	uint8_t pwd[16] = {0x00};
 	byte_t blockdata[4] = {0x00};
-	
+
 	memcpy(pwd, datain, 16);
-	
+
 	LED_A_ON(); LED_B_OFF(); LED_C_OFF();
-	clear_trace();
 	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
 
-	if(!iso14443a_select_card(NULL, NULL, NULL)) {
+	clear_trace();
+
+	if(!iso14443a_select_card(NULL, NULL, NULL, true, 0, true)) {
 		if (MF_DBGLEVEL >= 1) Dbprintf("Can't select card");
 		OnError(0);
 		return;
@@ -577,7 +585,7 @@ void MifareUSetPwd(uint8_t arg0, uint8_t *datain){
 		if (MF_DBGLEVEL >= 1) Dbprintf("Write block error");
 		OnError(47);
 		return;
-	};	
+	};
 
 	if(mifare_ultra_halt()) {
 		if (MF_DBGLEVEL >= 1) Dbprintf("Halt error");
@@ -592,15 +600,145 @@ void MifareUSetPwd(uint8_t arg0, uint8_t *datain){
 
 // Return 1 if the nonce is invalid else return 0
 int valid_nonce(uint32_t Nt, uint32_t NtEnc, uint32_t Ks1, uint8_t *parity) {
-	return ((oddparity((Nt >> 24) & 0xFF) == ((parity[0]) ^ oddparity((NtEnc >> 24) & 0xFF) ^ BIT(Ks1,16))) & \
-	(oddparity((Nt >> 16) & 0xFF) == ((parity[1]) ^ oddparity((NtEnc >> 16) & 0xFF) ^ BIT(Ks1,8))) & \
-	(oddparity((Nt >> 8) & 0xFF) == ((parity[2]) ^ oddparity((NtEnc >> 8) & 0xFF) ^ BIT(Ks1,0)))) ? 1 : 0;
+	return ((oddparity8((Nt >> 24) & 0xFF) == ((parity[0]) ^ oddparity8((NtEnc >> 24) & 0xFF) ^ BIT(Ks1,16))) & \
+	(oddparity8((Nt >> 16) & 0xFF) == ((parity[1]) ^ oddparity8((NtEnc >> 16) & 0xFF) ^ BIT(Ks1,8))) & \
+	(oddparity8((Nt >> 8) & 0xFF) == ((parity[2]) ^ oddparity8((NtEnc >> 8) & 0xFF) ^ BIT(Ks1,0)))) ? 1 : 0;
+}
+
+
+//-----------------------------------------------------------------------------
+// acquire encrypted nonces in order to perform the attack described in
+// Carlo Meijer, Roel Verdult, "Ciphertext-only Cryptanalysis on Hardened
+// Mifare Classic Cards" in Proceedings of the 22nd ACM SIGSAC Conference on
+// Computer and Communications Security, 2015
+//-----------------------------------------------------------------------------
+void MifareAcquireEncryptedNonces(uint32_t arg0, uint32_t arg1, uint32_t flags, uint8_t *datain)
+{
+	uint64_t ui64Key = 0;
+	uint8_t uid[10];
+	uint32_t cuid;
+	uint8_t cascade_levels = 0;
+	struct Crypto1State mpcs = {0, 0};
+	struct Crypto1State *pcs;
+	pcs = &mpcs;
+	uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];
+	int16_t isOK = 0;
+	uint8_t par_enc[1];
+	uint8_t nt_par_enc = 0;
+	uint8_t buf[USB_CMD_DATA_SIZE];
+	uint32_t timeout;
+
+	uint8_t blockNo = arg0 & 0xff;
+	uint8_t keyType = (arg0 >> 8) & 0xff;
+	uint8_t targetBlockNo = arg1 & 0xff;
+	uint8_t targetKeyType = (arg1 >> 8) & 0xff;
+	ui64Key = bytes_to_num(datain, 6);
+	bool initialize = flags & 0x0001;
+	bool slow = flags & 0x0002;
+	bool field_off = flags & 0x0004;
+
+	LED_A_ON();
+	LED_C_OFF();
+
+	if (initialize) {
+		iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
+		clear_trace();
+		set_tracing(true);
+	}
+
+	LED_C_ON();
+
+	uint16_t num_nonces = 0;
+	bool have_uid = false;
+	for (uint16_t i = 0; i <= USB_CMD_DATA_SIZE - 9; ) {
+
+		// Test if the action was cancelled
+		if(BUTTON_PRESS()) {
+			isOK = 2;
+			field_off = true;
+			break;
+		}
+
+		if (!have_uid) { // need a full select cycle to get the uid first
+			iso14a_card_select_t card_info;
+			if(!iso14443a_select_card(uid, &card_info, &cuid, true, 0, true)) {
+				if (MF_DBGLEVEL >= 1)	Dbprintf("AcquireNonces: Can't select card (ALL)");
+				continue;
+			}
+			switch (card_info.uidlen) {
+				case 4 : cascade_levels = 1; break;
+				case 7 : cascade_levels = 2; break;
+				case 10: cascade_levels = 3; break;
+				default: break;
+			}
+			have_uid = true;
+		} else { // no need for anticollision. We can directly select the card
+			if(!iso14443a_select_card(uid, NULL, NULL, false, cascade_levels, true)) {
+				if (MF_DBGLEVEL >= 1)	Dbprintf("AcquireNonces: Can't select card (UID)");
+				continue;
+			}
+		}
+
+		if (slow) {
+			timeout = GetCountSspClk() + HARDNESTED_PRE_AUTHENTICATION_LEADTIME;
+			while(GetCountSspClk() < timeout);
+		}
+
+		uint32_t nt1;
+		if (mifare_classic_authex(pcs, cuid, blockNo, keyType, ui64Key, AUTH_FIRST, &nt1, NULL)) {
+			if (MF_DBGLEVEL >= 1)	Dbprintf("AcquireNonces: Auth1 error");
+			continue;
+		}
+
+		// nested authentication
+		uint16_t len = mifare_sendcmd_short(pcs, AUTH_NESTED, 0x60 + (targetKeyType & 0x01), targetBlockNo, receivedAnswer, par_enc, NULL);
+		if (len != 4) {
+			if (MF_DBGLEVEL >= 1)	Dbprintf("AcquireNonces: Auth2 error len=%d", len);
+			continue;
+		}
+
+		// send an incomplete dummy response in order to trigger the card's authentication failure timeout
+		uint8_t dummy_answer[1] = {0};
+		ReaderTransmit(dummy_answer, 1, NULL);
+
+		timeout = GetCountSspClk() + HARDNESTED_AUTHENTICATION_TIMEOUT;
+		
+		num_nonces++;
+		if (num_nonces % 2) {
+			memcpy(buf+i, receivedAnswer, 4);
+			nt_par_enc = par_enc[0] & 0xf0;
+		} else {
+			nt_par_enc |= par_enc[0] >> 4;
+			memcpy(buf+i+4, receivedAnswer, 4);
+			memcpy(buf+i+8, &nt_par_enc, 1);
+			i += 9;
+		}
+
+		// wait for the card to become ready again
+		while(GetCountSspClk() < timeout);
+
+	}
+
+	LED_C_OFF();
+
+	crypto1_destroy(pcs);
+
+	LED_B_ON();
+	cmd_send(CMD_ACK, isOK, cuid, num_nonces, buf, sizeof(buf));
+	LED_B_OFF();
+
+	if (MF_DBGLEVEL >= 3)	DbpString("AcquireEncryptedNonces finished");
+
+	if (field_off) {
+		FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+		LEDsoff();
+	}
 }
 
 
 //-----------------------------------------------------------------------------
-// MIFARE nested authentication. 
-// 
+// MIFARE nested authentication.
+//
 //-----------------------------------------------------------------------------
 void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *datain)
 {
@@ -612,7 +750,7 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
 	uint64_t ui64Key = 0;
 
 	ui64Key = bytes_to_num(datain, 6);
-	
+
 	// variables
 	uint16_t rtr, i, j, len;
 	uint16_t davg;
@@ -621,7 +759,7 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
 	uint32_t cuid, nt1, nt2, nttmp, nttest, ks1;
 	uint8_t par[1];
 	uint32_t target_nt[2], target_ks[2];
-	
+
 	uint8_t par_array[4];
 	uint16_t ncount = 0;
 	struct Crypto1State mpcs = {0, 0};
@@ -632,19 +770,20 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
 	uint32_t auth1_time, auth2_time;
 	static uint16_t delta_time;
 
-	// free eventually allocated BigBuf memory
-	BigBuf_free();
-	// clear trace
-	clear_trace();
-	set_tracing(false);
-	
-	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
-
 	LED_A_ON();
 	LED_C_OFF();
+	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
 
+	// free eventually allocated BigBuf memory
+	BigBuf_free();
+
+	if (calibrate) clear_trace();
+	set_tracing(true);
 
 	// statistics on nonce distance
+	int16_t isOK = 0;
+	#define NESTED_MAX_TRIES 12
+	uint16_t unsuccessfull_tries = 0;
 	if (calibrate) {	// for first call only. Otherwise reuse previous calibration
 		LED_B_ON();
 		WDT_HIT();
@@ -652,9 +791,15 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
 		davg = dmax = 0;
 		dmin = 2000;
 		delta_time = 0;
-		
+
 		for (rtr = 0; rtr < 17; rtr++) {
 
+			// Test if the action was cancelled
+			if(BUTTON_PRESS()) {
+				isOK = -2;
+				break;
+			}
+
 			// prepare next select. No need to power down the card.
 			if(mifare_classic_halt(pcs, cuid)) {
 				if (MF_DBGLEVEL >= 1)	Dbprintf("Nested: Halt error");
@@ -662,7 +807,7 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
 				continue;
 			}
 
-			if(!iso14443a_select_card(uid, NULL, &cuid)) {
+			if(!iso14443a_select_card(uid, NULL, &cuid, true, 0, true)) {
 				if (MF_DBGLEVEL >= 1)	Dbprintf("Nested: Can't select card");
 				rtr--;
 				continue;
@@ -702,42 +847,45 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
 					delta_time = auth2_time - auth1_time + 32;  // allow some slack for proper timing
 				}
 				if (MF_DBGLEVEL >= 3) Dbprintf("Nested: calibrating... ntdist=%d", i);
+			} else {
+				unsuccessfull_tries++;
+				if (unsuccessfull_tries > NESTED_MAX_TRIES) {	// card isn't vulnerable to nested attack (random numbers are not predictable)
+					isOK = -3;
+				}
 			}
 		}
-		
-		if (rtr <= 1)	return;
 
 		davg = (davg + (rtr - 1)/2) / (rtr - 1);
-		
-		if (MF_DBGLEVEL >= 3) Dbprintf("min=%d max=%d avg=%d, delta_time=%d", dmin, dmax, davg, delta_time);
+
+		if (MF_DBGLEVEL >= 3) Dbprintf("rtr=%d isOK=%d min=%d max=%d avg=%d, delta_time=%d", rtr, isOK, dmin, dmax, davg, delta_time);
 
 		dmin = davg - 2;
 		dmax = davg + 2;
-		
+
 		LED_B_OFF();
-	
+
 	}
-	//  -------------------------------------------------------------------------------------------------	
-	
+	//  -------------------------------------------------------------------------------------------------
+
 	LED_C_ON();
 
 	//  get crypted nonces for target sector
-	for(i=0; i < 2; i++) { // look for exactly two different nonces
+	for(i=0; i < 2 && !isOK; i++) { // look for exactly two different nonces
 
 		target_nt[i] = 0;
 		while(target_nt[i] == 0) { // continue until we have an unambiguous nonce
-		
+
 			// prepare next select. No need to power down the card.
 			if(mifare_classic_halt(pcs, cuid)) {
 				if (MF_DBGLEVEL >= 1)	Dbprintf("Nested: Halt error");
 				continue;
 			}
 
-			if(!iso14443a_select_card(uid, NULL, &cuid)) {
+			if(!iso14443a_select_card(uid, NULL, &cuid, true, 0, true)) {
 				if (MF_DBGLEVEL >= 1)	Dbprintf("Nested: Can't select card");
 				continue;
 			};
-		
+
 			auth1_time = 0;
 			if(mifare_classic_authex(pcs, cuid, blockNo, keyType, ui64Key, AUTH_FIRST, &nt1, &auth1_time)) {
 				if (MF_DBGLEVEL >= 1)	Dbprintf("Nested: Auth1 error");
@@ -751,15 +899,15 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
 				if (MF_DBGLEVEL >= 1)	Dbprintf("Nested: Auth2 error len=%d", len);
 				continue;
 			};
-		
-			nt2 = bytes_to_num(receivedAnswer, 4);		
+
+			nt2 = bytes_to_num(receivedAnswer, 4);
 			if (MF_DBGLEVEL >= 3) Dbprintf("Nonce#%d: Testing nt1=%08x nt2enc=%08x nt2par=%02x", i+1, nt1, nt2, par[0]);
-			
+
 			// Parity validity check
 			for (j = 0; j < 4; j++) {
-				par_array[j] = (oddparity(receivedAnswer[j]) != ((par[0] >> (7-j)) & 0x01));
+				par_array[j] = (oddparity8(receivedAnswer[j]) != ((par[0] >> (7-j)) & 0x01));
 			}
-			
+
 			ncount = 0;
 			nttest = prng_successor(nt1, dmin - 1);
 			for (j = dmin; j < dmax + 1; j++) {
@@ -788,99 +936,90 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat
 	}
 
 	LED_C_OFF();
-	
+
 	//  ----------------------------- crypto1 destroy
 	crypto1_destroy(pcs);
-	
+
 	byte_t buf[4 + 4 * 4];
 	memcpy(buf, &cuid, 4);
 	memcpy(buf+4, &target_nt[0], 4);
 	memcpy(buf+8, &target_ks[0], 4);
 	memcpy(buf+12, &target_nt[1], 4);
 	memcpy(buf+16, &target_ks[1], 4);
-	
+
 	LED_B_ON();
-	cmd_send(CMD_ACK, 0, 2, targetBlockNo + (targetKeyType * 0x100), buf, sizeof(buf));
+	cmd_send(CMD_ACK, isOK, 0, targetBlockNo + (targetKeyType * 0x100), buf, sizeof(buf));
 	LED_B_OFF();
 
 	if (MF_DBGLEVEL >= 3)	DbpString("NESTED FINISHED");
 
 	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
 	LEDsoff();
-	set_tracing(TRUE);
 }
 
 //-----------------------------------------------------------------------------
-// MIFARE check keys. key count up to 85. 
-// 
+// MIFARE check keys. key count up to 85.
+//
 //-----------------------------------------------------------------------------
-void MifareChkKeys(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
+void MifareChkKeys(uint16_t arg0, uint16_t arg1, uint8_t arg2, uint8_t *datain)
 {
-  // params
-	uint8_t blockNo = arg0;
-	uint8_t keyType = arg1;
+	uint8_t blockNo = arg0 & 0xff;
+	uint8_t keyType = (arg0 >> 8) & 0xff;
+	bool clearTrace = arg1 & 0x01;
+	bool multisectorCheck = arg1 & 0x02;
+	uint8_t set14aTimeout = (arg1 >> 8) & 0xff;
 	uint8_t keyCount = arg2;
-	uint64_t ui64Key = 0;
-	
-	// variables
-	int i;
-	byte_t isOK = 0;
-	uint8_t uid[10];
-	uint32_t cuid;
-	struct Crypto1State mpcs = {0, 0};
-	struct Crypto1State *pcs;
-	pcs = &mpcs;
-	
+
 	// clear debug level
-	int OLD_MF_DBGLEVEL = MF_DBGLEVEL;	
+	int OLD_MF_DBGLEVEL = MF_DBGLEVEL;
 	MF_DBGLEVEL = MF_DBG_NONE;
-	
-	// clear trace
-	clear_trace();
-	set_tracing(TRUE);
-
-	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
 
 	LED_A_ON();
 	LED_B_OFF();
 	LED_C_OFF();
+	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
 
-	for (i = 0; i < keyCount; i++) {
-		if(mifare_classic_halt(pcs, cuid)) {
-			if (MF_DBGLEVEL >= 1)	Dbprintf("ChkKeys: Halt error");
-		}
+	if (clearTrace) clear_trace();
+	set_tracing(true);
 
-		if(!iso14443a_select_card(uid, NULL, &cuid)) {
-			if (OLD_MF_DBGLEVEL >= 1)	Dbprintf("ChkKeys: Can't select card");
-			break;
-		};
+	if (set14aTimeout){
+		iso14a_set_timeout(set14aTimeout * 10); // timeout: ms = x/106  35-minimum, 50-OK 106-recommended 500-safe
+	}
+	
+	if (multisectorCheck) {
+		TKeyIndex keyIndex = {{0}};
+		uint8_t sectorCnt = blockNo;
+		int res = MifareMultisectorChk(datain, keyCount, sectorCnt, keyType, OLD_MF_DBGLEVEL, &keyIndex);
 
-		ui64Key = bytes_to_num(datain + i * 6, 6);
-		if(mifare_classic_auth(pcs, cuid, blockNo, keyType, ui64Key, AUTH_FIRST)) {
-			continue;
-		};
+		LED_B_ON();
+		if (res >= 0) {
+			cmd_send(CMD_ACK, 1, 0, 0, keyIndex, 80);
+		} else {
+			cmd_send(CMD_ACK, 0, 0, 0, NULL, 0);
+		}
+		LED_B_OFF();
+	} else {	
+		int res = MifareChkBlockKeys(datain, keyCount, blockNo, keyType, OLD_MF_DBGLEVEL);
 		
-		isOK = 1;
-		break;
+		LED_B_ON();
+		if (res > 0) {
+			cmd_send(CMD_ACK, 1, 0, 0, datain + (res - 1) * 6, 6);
+		} else {
+			cmd_send(CMD_ACK, 0, 0, 0, NULL, 0);
+		}
+		LED_B_OFF();
 	}
-	
-	//  ----------------------------- crypto1 destroy
-	crypto1_destroy(pcs);
-	
-	LED_B_ON();
-    cmd_send(CMD_ACK,isOK,0,0,datain + i * 6,6);
-	LED_B_OFF();
 
 	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
 	LEDsoff();
 
 	// restore debug level
-	MF_DBGLEVEL = OLD_MF_DBGLEVEL;	
+	MF_DBGLEVEL = OLD_MF_DBGLEVEL;
 }
 
 //-----------------------------------------------------------------------------
 // MIFARE commands set debug level
-// 
+//
 //-----------------------------------------------------------------------------
 void MifareSetDbgLvl(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain){
 	MF_DBGLEVEL = arg0;
@@ -889,17 +1028,24 @@ void MifareSetDbgLvl(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai
 
 //-----------------------------------------------------------------------------
 // Work with emulator memory
-// 
+//
+// Note: we call FpgaDownloadAndGo(FPGA_BITSTREAM_HF) here although FPGA is not
+// involved in dealing with emulator memory. But if it is called later, it might
+// destroy the Emulator Memory.
 //-----------------------------------------------------------------------------
+
 void MifareEMemClr(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain){
+	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 	emlClearMem();
 }
 
 void MifareEMemSet(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain){
+	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 	emlSetMem(datain, arg0, arg1); // data, block num, blocks count
 }
 
 void MifareEMemGet(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain){
+	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 	byte_t buf[USB_CMD_DATA_SIZE];
 	emlGetMem(buf, arg0, arg1); // data, block num, blocks count (max 4)
 
@@ -910,7 +1056,7 @@ void MifareEMemGet(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain)
 
 //-----------------------------------------------------------------------------
 // Load a card into the emulator memory
-// 
+//
 //-----------------------------------------------------------------------------
 void MifareECardLoad(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain){
 	uint8_t numSectors = arg0;
@@ -926,23 +1072,21 @@ void MifareECardLoad(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai
 	byte_t dataoutbuf2[16];
 	uint8_t uid[10];
 
-	// clear trace
-	clear_trace();
-	set_tracing(false);
-	
-	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
-
 	LED_A_ON();
 	LED_B_OFF();
 	LED_C_OFF();
-	
+	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
+
+	clear_trace();
+	set_tracing(false);
+
 	bool isOK = true;
 
-	if(!iso14443a_select_card(uid, NULL, &cuid)) {
+	if(!iso14443a_select_card(uid, NULL, &cuid, true, 0, true)) {
 		isOK = false;
 		if (MF_DBGLEVEL >= 1)	Dbprintf("Can't select card");
 	}
-		
+
 	for (uint8_t sectorNo = 0; isOK && sectorNo < numSectors; sectorNo++) {
 		ui64Key = emlGetKey(sectorNo, keyType);
 		if (sectorNo == 0){
@@ -958,7 +1102,7 @@ void MifareECardLoad(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai
 				break;
 			}
 		}
-		
+
 		for (uint8_t blockNo = 0; isOK && blockNo < NumBlocksPerSector(sectorNo); blockNo++) {
 			if(isOK && mifare_classic_readblock(pcs, cuid, FirstBlockOfSector(sectorNo) + blockNo, dataoutbuf)) {
 				isOK = false;
@@ -987,7 +1131,7 @@ void MifareECardLoad(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai
 
 	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
 	LEDsoff();
-	
+
 	if (MF_DBGLEVEL >= 2) DbpString("EMUL FILL SECTORS FINISHED");
 
 }
@@ -995,10 +1139,147 @@ void MifareECardLoad(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai
 
 //-----------------------------------------------------------------------------
 // Work with "magic Chinese" card (email him: ouyangweidaxian@live.cn)
-// 
+//
 //-----------------------------------------------------------------------------
+
+static bool isBlockTrailer(int blockN) {
+	if (blockN >= 0 && blockN < 128) {
+		return ((blockN & 0x03) == 0x03);
+	}
+	if (blockN >= 128 && blockN <= 256) {
+		return ((blockN & 0x0F) == 0x0F);
+	}
+	return FALSE;
+}
+
+void MifareCWipe(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain){
+	// var
+	byte_t isOK = 0;
+	uint32_t numBlocks = arg0;
+	// cmdParams:
+	// bit 0 - wipe gen1a
+	// bit 1 - fill card with default data
+	// bit 2 - gen1a = 0, gen1b = 1
+	uint8_t cmdParams = arg1;
+	bool needWipe = cmdParams & 0x01;
+	bool needFill = cmdParams & 0x02;
+	bool gen1b = cmdParams & 0x04;
+	
+	uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];
+	uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE];
+	
+	uint8_t block0[16] = {0x01, 0x02, 0x03, 0x04, 0x04, 0x08, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xBE, 0xAF};
+	uint8_t block1[16] = {0x00};
+	uint8_t blockK[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x08, 0x77, 0x8F, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+	uint8_t d_block[18] = {0x00};
+	
+	// card commands
+	uint8_t wupC1[]       = { 0x40 };
+	uint8_t wupC2[]       = { 0x43 };
+	uint8_t wipeC[]       = { 0x41 };
+	
+	// iso14443 setup
+	LED_A_ON();
+	LED_B_OFF();
+	LED_C_OFF();
+	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
+
+	// tracing
+	clear_trace();
+	set_tracing(true);
+		
+	while (true){
+		// wipe
+		if (needWipe){
+			ReaderTransmitBitsPar(wupC1,7,0, NULL);
+			if(!ReaderReceive(receivedAnswer, receivedAnswerPar) || (receivedAnswer[0] != 0x0a)) {
+				if (MF_DBGLEVEL >= 1)	Dbprintf("wupC1 error");
+				break;
+			};
+
+			ReaderTransmit(wipeC, sizeof(wipeC), NULL);
+			if(!ReaderReceive(receivedAnswer, receivedAnswerPar) || (receivedAnswer[0] != 0x0a)) {
+				if (MF_DBGLEVEL >= 1)	Dbprintf("wipeC error");
+				break;
+			};
+
+			if(mifare_classic_halt(NULL, 0)) {
+				if (MF_DBGLEVEL > 2)	Dbprintf("Halt error");
+			};
+		};
+	
+		// put default data
+		if (needFill){
+			// select commands
+			ReaderTransmitBitsPar(wupC1, 7, 0, NULL);
+
+			// gen1b magic tag : do no issue wupC2 and don't expect 0x0a response after SELECT_UID (after getting UID from chip in 'hf mf csetuid' command)
+			if (!gen1b) { 
+
+				if(!ReaderReceive(receivedAnswer, receivedAnswerPar) || (receivedAnswer[0] != 0x0a)) {
+					if (MF_DBGLEVEL >= 1)	Dbprintf("wupC1 error");
+					break;
+				};
+
+				ReaderTransmit(wupC2, sizeof(wupC2), NULL);
+				if(!ReaderReceive(receivedAnswer, receivedAnswerPar) || (receivedAnswer[0] != 0x0a)) {
+					if (MF_DBGLEVEL >= 1)	Dbprintf("wupC2 error");
+					break;
+				};
+			}
+
+			// send blocks command
+			for (int blockNo = 0; blockNo < numBlocks; blockNo++) {
+				if ((mifare_sendcmd_short(NULL, 0, 0xA0, blockNo, receivedAnswer, receivedAnswerPar, NULL) != 1) || (receivedAnswer[0] != 0x0a)) {
+					if (MF_DBGLEVEL >= 1)	Dbprintf("write block send command error");
+					break;
+				};
+				
+				// check type of block and add crc
+				if (!isBlockTrailer(blockNo)){
+					memcpy(d_block, block1, 16);
+				} else {
+					memcpy(d_block, blockK, 16);
+				}
+				if (blockNo == 0) {
+					memcpy(d_block, block0, 16);
+				}
+				AppendCrc14443a(d_block, 16);
+
+				// send write command
+				ReaderTransmit(d_block, sizeof(d_block), NULL);
+				if ((ReaderReceive(receivedAnswer, receivedAnswerPar) != 1) || (receivedAnswer[0] != 0x0a)) {
+					if (MF_DBGLEVEL >= 1)	Dbprintf("write block send data error");
+					break;
+				};
+			}
+			
+			// halt
+			// do no issue halt command for gen1b 
+			if (!gen1b) {
+				if (mifare_classic_halt(NULL, 0)) {
+					if (MF_DBGLEVEL > 2)	Dbprintf("Halt error");
+						break;
+				}
+			}
+		}
+		break;
+	}	
+
+	// send USB response
+	LED_B_ON();
+	cmd_send(CMD_ACK,isOK,0,0,NULL,0);
+	LED_B_OFF();
+	
+	// reset fpga
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+	LEDsoff();
+		
+	return;
+}
+
 void MifareCSetBlock(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain){
-  
+
   // params
 	uint8_t needWipe = arg0;
 	// bit 0 - need get UID
@@ -1006,20 +1287,21 @@ void MifareCSetBlock(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai
 	// bit 2 - need HALT after sequence
 	// bit 3 - need init FPGA and field before sequence
 	// bit 4 - need reset FPGA and LED
+	// bit 6 - gen1b backdoor type
 	uint8_t workFlags = arg1;
 	uint8_t blockNo = arg2;
-	
+
 	// card commands
-	uint8_t wupC1[]       = { 0x40 }; 
-	uint8_t wupC2[]       = { 0x43 }; 
-	uint8_t wipeC[]       = { 0x41 }; 
-	
+	uint8_t wupC1[]       = { 0x40 };
+	uint8_t wupC2[]       = { 0x43 };
+	uint8_t wipeC[]       = { 0x41 };
+
 	// variables
 	byte_t isOK = 0;
 	uint8_t uid[10] = {0x00};
 	uint8_t d_block[18] = {0x00};
 	uint32_t cuid;
-	
+
 	uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];
 	uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE];
 
@@ -1028,29 +1310,32 @@ void MifareCSetBlock(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai
 		LED_A_ON();
 		LED_B_OFF();
 		LED_C_OFF();
-	
-		clear_trace();
-		set_tracing(TRUE);
 		iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
+
+		clear_trace();
+		set_tracing(true);
 	}
 
 	while (true) {
 
 		// get UID from chip
 		if (workFlags & 0x01) {
-			if(!iso14443a_select_card(uid, NULL, &cuid)) {
+			if(!iso14443a_select_card(uid, NULL, &cuid, true, 0, true)) {
 				if (MF_DBGLEVEL >= 1)	Dbprintf("Can't select card");
-				break;
-			};
-
-			if(mifare_classic_halt(NULL, cuid)) {
-				if (MF_DBGLEVEL >= 1)	Dbprintf("Halt error");
-				break;
-			};
+				// Continue, if we set wrong UID or wrong UID checksum or some ATQA or SAK we will can't select card. But we need to write block 0 to make card work.
+				//break;
+				};
+
+				if(mifare_classic_halt(NULL, cuid)) {
+					if (MF_DBGLEVEL > 2)	Dbprintf("Halt error");
+					// Continue, some magic tags misbehavies and send an answer to it.
+					// break;
+				};
 		};
-	
+
 		// reset chip
-		if (needWipe){
+		// Wipe command don't work with gen1b
+		if (needWipe && !(workFlags & 0x40)){
 			ReaderTransmitBitsPar(wupC1,7,0, NULL);
 			if(!ReaderReceive(receivedAnswer, receivedAnswerPar) || (receivedAnswer[0] != 0x0a)) {
 				if (MF_DBGLEVEL >= 1)	Dbprintf("wupC1 error");
@@ -1063,52 +1348,62 @@ void MifareCSetBlock(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai
 				break;
 			};
 
-			if(mifare_classic_halt(NULL, cuid)) {
-				if (MF_DBGLEVEL >= 1)	Dbprintf("Halt error");
-				break;
+			if(mifare_classic_halt(NULL, 0)) {
+				if (MF_DBGLEVEL > 2)	Dbprintf("Halt error");
+				// Continue, some magic tags misbehavies and send an answer to it.
+                        	// break;
 			};
-		};	
+		};
 
 		// write block
 		if (workFlags & 0x02) {
 			ReaderTransmitBitsPar(wupC1,7,0, NULL);
-			if(!ReaderReceive(receivedAnswer, receivedAnswerPar) || (receivedAnswer[0] != 0x0a)) {
-				if (MF_DBGLEVEL >= 1)	Dbprintf("wupC1 error");
-				break;
-			};
 
-			ReaderTransmit(wupC2, sizeof(wupC2), NULL);
-			if(!ReaderReceive(receivedAnswer, receivedAnswerPar) || (receivedAnswer[0] != 0x0a)) {
-				if (MF_DBGLEVEL >= 1)	Dbprintf("wupC2 error");
-				break;
-			};
+			// gen1b magic tag : do no issue wupC2 and don't expect 0x0a response after SELECT_UID (after getting UID from chip in 'hf mf csetuid' command)
+			if (!(workFlags & 0x40)) {
+
+				if(!ReaderReceive(receivedAnswer, receivedAnswerPar) || (receivedAnswer[0] != 0x0a)) {
+					if (MF_DBGLEVEL >= 1)	Dbprintf("wupC1 error");
+					break;
+				};
+
+				ReaderTransmit(wupC2, sizeof(wupC2), NULL);
+				if(!ReaderReceive(receivedAnswer, receivedAnswerPar) || (receivedAnswer[0] != 0x0a)) {
+					if (MF_DBGLEVEL >= 1)	Dbprintf("wupC2 error");
+					break;
+				};
+			}
 		}
 
 		if ((mifare_sendcmd_short(NULL, 0, 0xA0, blockNo, receivedAnswer, receivedAnswerPar, NULL) != 1) || (receivedAnswer[0] != 0x0a)) {
 			if (MF_DBGLEVEL >= 1)	Dbprintf("write block send command error");
 			break;
 		};
-	
+
 		memcpy(d_block, datain, 16);
 		AppendCrc14443a(d_block, 16);
-	
+
 		ReaderTransmit(d_block, sizeof(d_block), NULL);
 		if ((ReaderReceive(receivedAnswer, receivedAnswerPar) != 1) || (receivedAnswer[0] != 0x0a)) {
 			if (MF_DBGLEVEL >= 1)	Dbprintf("write block send data error");
 			break;
-		};	
-	
+		};
+
 		if (workFlags & 0x04) {
-			if (mifare_classic_halt(NULL, cuid)) {
-				if (MF_DBGLEVEL >= 1)	Dbprintf("Halt error");
-				break;
-			};
+			// do no issue halt command for gen1b magic tag (#db# halt error. response len: 1)
+			if (!(workFlags & 0x40)) {
+				if (mifare_classic_halt(NULL, 0)) {
+					if (MF_DBGLEVEL > 2)	Dbprintf("Halt error");
+					// Continue, some magic tags misbehavies and send an answer to it.
+					// break;
+				}
+			}
 		}
-		
+
 		isOK = 1;
 		break;
 	}
-	
+
 	LED_B_ON();
 	cmd_send(CMD_ACK,isOK,0,0,uid,4);
 	LED_B_OFF();
@@ -1121,35 +1416,37 @@ void MifareCSetBlock(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai
 
 
 void MifareCGetBlock(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain){
-  
-  // params
+
+	// params
 	// bit 1 - need wupC
 	// bit 2 - need HALT after sequence
 	// bit 3 - need init FPGA and field before sequence
 	// bit 4 - need reset FPGA and LED
+	// bit 5 - need to set datain instead of issuing USB reply (called via ARM for StandAloneMode14a)
+	// bit 6 - gen1b backdoor type
 	uint8_t workFlags = arg0;
 	uint8_t blockNo = arg2;
-	
+
 	// card commands
-	uint8_t wupC1[]       = { 0x40 }; 
-	uint8_t wupC2[]       = { 0x43 }; 
-	
+	uint8_t wupC1[]       = { 0x40 };
+	uint8_t wupC2[]       = { 0x43 };
+
 	// variables
 	byte_t isOK = 0;
 	uint8_t data[18] = {0x00};
 	uint32_t cuid = 0;
-	
+
 	uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];
 	uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE];
-	
+
 	if (workFlags & 0x08) {
 		LED_A_ON();
 		LED_B_OFF();
 		LED_C_OFF();
-	
-		clear_trace();
-		set_tracing(TRUE);
 		iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
+
+		clear_trace();
+		set_tracing(true);
 	}
 
 	while (true) {
@@ -1158,14 +1455,16 @@ void MifareCGetBlock(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai
 			if(!ReaderReceive(receivedAnswer, receivedAnswerPar) || (receivedAnswer[0] != 0x0a)) {
 				if (MF_DBGLEVEL >= 1)	Dbprintf("wupC1 error");
 				break;
-			};
-
+		};
+		// do no issue for gen1b magic tag
+		if (!(workFlags & 0x40)) {
 			ReaderTransmit(wupC2, sizeof(wupC2), NULL);
 			if(!ReaderReceive(receivedAnswer, receivedAnswerPar) || (receivedAnswer[0] != 0x0a)) {
 				if (MF_DBGLEVEL >= 1)	Dbprintf("wupC2 error");
 				break;
 			};
 		}
+	}
 
 		// read block
 		if ((mifare_sendcmd_short(NULL, 0, 0x30, blockNo, receivedAnswer, receivedAnswerPar, NULL) != 18)) {
@@ -1173,20 +1472,29 @@ void MifareCGetBlock(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai
 			break;
 		};
 		memcpy(data, receivedAnswer, 18);
-		
+
 		if (workFlags & 0x04) {
-			if (mifare_classic_halt(NULL, cuid)) {
-				if (MF_DBGLEVEL >= 1)	Dbprintf("Halt error");
-				break;
-			};
+			// do no issue halt command for gen1b magic tag (#db# halt error. response len: 1)
+			if (!(workFlags & 0x40)) {
+				if (mifare_classic_halt(NULL, cuid)) {
+					if (MF_DBGLEVEL > 1)	Dbprintf("Halt error");
+					// Continue, some magic tags misbehavies and send an answer to it.
+					//		break;
+				}
+			}
 		}
-		
+
 		isOK = 1;
 		break;
 	}
-	
+
 	LED_B_ON();
-	cmd_send(CMD_ACK,isOK,0,0,data,18);
+	if (workFlags & 0x20) {
+		if (isOK)
+			memcpy(datain, data, 18);
+	}
+	else
+		cmd_send(CMD_ACK,isOK,0,0,data,18);
 	LED_B_OFF();
 
 	if ((workFlags & 0x10) || (!isOK)) {
@@ -1196,35 +1504,47 @@ void MifareCGetBlock(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai
 }
 
 void MifareCIdent(){
-  
+
 	// card commands
-	uint8_t wupC1[]       = { 0x40 }; 
-	uint8_t wupC2[]       = { 0x43 }; 
-	
+	uint8_t wupC1[]       = { 0x40 };
+	uint8_t wupC2[]       = { 0x43 };
+
 	// variables
-	byte_t isOK = 1;
-	
+	byte_t isOK = 0;
+
 	uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];
 	uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE];
+	
+	LED_A_ON();
+	LED_B_OFF();
+	LED_C_OFF();
+	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
 
-	ReaderTransmitBitsPar(wupC1,7,0, NULL);
-	if(!ReaderReceive(receivedAnswer, receivedAnswerPar) || (receivedAnswer[0] != 0x0a)) {
-		isOK = 0;
-	};
+	clear_trace();
+	set_tracing(true);	
 
-	ReaderTransmit(wupC2, sizeof(wupC2), NULL);
-	if(!ReaderReceive(receivedAnswer, receivedAnswerPar) || (receivedAnswer[0] != 0x0a)) {
-		isOK = 0;
-	};
+	ReaderTransmitBitsPar(wupC1,7,0, NULL);
+	if(ReaderReceive(receivedAnswer, receivedAnswerPar) && (receivedAnswer[0] == 0x0a)) {
+		isOK = 2;
 
-	if (mifare_classic_halt(NULL, 0)) {
-		isOK = 0;
+		ReaderTransmit(wupC2, sizeof(wupC2), NULL);
+		if(ReaderReceive(receivedAnswer, receivedAnswerPar) && (receivedAnswer[0] == 0x0a)) {
+			isOK = 1;
+		};
 	};
 
+	// From iceman1001: removed the if,  since some magic tags misbehavies and send an answer to it.
+	mifare_classic_halt(NULL, 0);
+	
+	LED_B_ON();
 	cmd_send(CMD_ACK,isOK,0,0,0,0);
+	LED_B_OFF();
+
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+	LEDsoff();	
 }
 
-			//
+//
 // DESFIRE
 //
 
@@ -1233,11 +1553,11 @@ void Mifare_DES_Auth1(uint8_t arg0, uint8_t *datain){
 	byte_t dataout[11] = {0x00};
 	uint8_t uid[10] = {0x00};
 	uint32_t cuid;
-    
-	clear_trace();
+
 	iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
+	clear_trace();
 
-	int len = iso14443a_select_card(uid, NULL, &cuid);
+	int len = iso14443a_select_card(uid, NULL, &cuid, true, 0, true);
 	if(!len) {
 		if (MF_DBGLEVEL >= MF_DBG_ERROR) Dbprintf("Can't select card");
 		OnError(1);
@@ -1260,13 +1580,13 @@ void Mifare_DES_Auth2(uint32_t arg0, uint8_t *datain){
 	uint8_t key[16] = {0x00};
 	byte_t isOK = 0;
 	byte_t dataout[12] = {0x00};
-    
+
 	memcpy(key, datain, 16);
-	
+
 	isOK = mifare_desfire_des_auth2(cuid, key, dataout);
-	
+
 	if( isOK) {
-		if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("Authentication part2: Failed");  
+		if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("Authentication part2: Failed");
 		OnError(4);
 		return;
 	}