[proxmark3-svn] / client / cmdhflist.c

//-----------------------------------------------------------------------------
// Copyright (C) Merlok - 2017
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Command: hf mf list. It shows data from arm buffer.
//-----------------------------------------------------------------------------

#include "cmdhflist.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include "util.h"
#include "data.h"
#include "ui.h"
#include "iso14443crc.h"
#include "parity.h"
#include "protocols.h"
#include "crapto1/crapto1.h"
#include "mifarehost.h"
#include "mifaredefault.h"


enum MifareAuthSeq {
	masNone,
	masNt,
	masNrAr,
	masAt,
	masAuthComplete,
	masFirstData,
	masData,
	masError,
};
static enum MifareAuthSeq MifareAuthState;
static TAuthData AuthData;

void ClearAuthData() {
	AuthData.uid = 0;
	AuthData.nt = 0;
	AuthData.first_auth = true;
}

/**
 * @brief iso14443A_CRC_check Checks CRC in command or response
 * @param isResponse
 * @param data
 * @param len
 * @return  0 : CRC-command, CRC not ok
 *          1 : CRC-command, CRC ok
 *          2 : Not crc-command
 */
uint8_t iso14443A_CRC_check(bool isResponse, uint8_t* data, uint8_t len)
{
	uint8_t b1,b2;

	if(len <= 2) return 2;

	if(isResponse & (len < 6)) return 2;
	
	ComputeCrc14443(CRC_14443_A, data, len-2, &b1, &b2);
	if (b1 != data[len-2] || b2 != data[len-1]) {
		return 0;
	} else {
		return 1;
	}
}

uint8_t mifare_CRC_check(bool isResponse, uint8_t* data, uint8_t len)
{
	switch(MifareAuthState) {
		case masNone:
		case masError:
			return iso14443A_CRC_check(isResponse, data, len);
		default:
			return 2;
	}
}

void annotateIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
{
	switch(cmd[0])
	{
	case ISO14443A_CMD_WUPA:        
		snprintf(exp,size,"WUPA"); 
		MifareAuthState = masNone;
		break;
	case ISO14443A_CMD_ANTICOLL_OR_SELECT:{
		// 93 20 = Anticollision (usage: 9320 - answer: 4bytes UID+1byte UID-bytes-xor)
		// 93 70 = Select (usage: 9370+5bytes 9320 answer - answer: 1byte SAK)
		if(cmd[1] == 0x70)
		{
			snprintf(exp,size,"SELECT_UID"); break;
		}else
		{
			snprintf(exp,size,"ANTICOLL"); break;
		}
	}
	case ISO14443A_CMD_ANTICOLL_OR_SELECT_2:{
		//95 20 = Anticollision of cascade level2
		//95 70 = Select of cascade level2
		if(cmd[2] == 0x70)
		{
			snprintf(exp,size,"SELECT_UID-2"); break;
		}else
		{
			snprintf(exp,size,"ANTICOLL-2"); break;
		}
	}
	case ISO14443A_CMD_REQA:		
		snprintf(exp,size,"REQA"); 
		MifareAuthState = masNone;
		break;
	case ISO14443A_CMD_READBLOCK:	snprintf(exp,size,"READBLOCK(%d)",cmd[1]); break;
	case ISO14443A_CMD_WRITEBLOCK:	snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]); break;
	case ISO14443A_CMD_HALT:		
		snprintf(exp,size,"HALT"); 
		MifareAuthState = masNone;
		break;
	case ISO14443A_CMD_RATS:		snprintf(exp,size,"RATS"); break;
	case MIFARE_CMD_INC:			snprintf(exp,size,"INC(%d)",cmd[1]); break;
	case MIFARE_CMD_DEC:			snprintf(exp,size,"DEC(%d)",cmd[1]); break;
	case MIFARE_CMD_RESTORE:		snprintf(exp,size,"RESTORE(%d)",cmd[1]); break;
	case MIFARE_CMD_TRANSFER:		snprintf(exp,size,"TRANSFER(%d)",cmd[1]); break;
	case MIFARE_AUTH_KEYA:
		if ( cmdsize > 3) {
			snprintf(exp,size,"AUTH-A(%d)",cmd[1]); 
			MifareAuthState = masNt;
		} else {
			//	case MIFARE_ULEV1_VERSION :  both 0x60.
			snprintf(exp,size,"EV1 VERSION");
		}
		break;
	case MIFARE_AUTH_KEYB:
		MifareAuthState = masNt;
		snprintf(exp,size,"AUTH-B(%d)",cmd[1]); 
		break;
	case MIFARE_MAGICWUPC1:			snprintf(exp,size,"MAGIC WUPC1"); break;
	case MIFARE_MAGICWUPC2:			snprintf(exp,size,"MAGIC WUPC2"); break;
	case MIFARE_MAGICWIPEC:			snprintf(exp,size,"MAGIC WIPEC"); break;
	case MIFARE_ULC_AUTH_1:		snprintf(exp,size,"AUTH "); break;
	case MIFARE_ULC_AUTH_2:		snprintf(exp,size,"AUTH_ANSW"); break;
	case MIFARE_ULEV1_AUTH:
		if ( cmdsize == 7 )
			snprintf(exp,size,"PWD-AUTH KEY: 0x%02x%02x%02x%02x", cmd[1], cmd[2], cmd[3], cmd[4] );
		else
			snprintf(exp,size,"PWD-AUTH");
		break;
	case MIFARE_ULEV1_FASTREAD:{
		if ( cmdsize >=3 && cmd[2] <= 0xE6)
			snprintf(exp,size,"READ RANGE (%d-%d)",cmd[1],cmd[2]); 
		else
			snprintf(exp,size,"?");
		break;
	}
	case MIFARE_ULC_WRITE:{
		if ( cmd[1] < 0x21 )
			snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]); 
		else
			snprintf(exp,size,"?");
		break;
	}
	case MIFARE_ULEV1_READ_CNT:{
		if ( cmd[1] < 5 )
			snprintf(exp,size,"READ CNT(%d)",cmd[1]);
		else
			snprintf(exp,size,"?");
		break;
	}
	case MIFARE_ULEV1_INCR_CNT:{
		if ( cmd[1] < 5 )
			snprintf(exp,size,"INCR(%d)",cmd[1]);
		else
			snprintf(exp,size,"?");
		break;
	}
	case MIFARE_ULEV1_READSIG:		snprintf(exp,size,"READ_SIG"); break;
	case MIFARE_ULEV1_CHECKTEAR:	snprintf(exp,size,"CHK_TEARING(%d)",cmd[1]); break;
	case MIFARE_ULEV1_VCSL:		snprintf(exp,size,"VCSL"); break;
	default:						snprintf(exp,size,"?"); break;
	}
	return;
}

void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8_t* parity, uint8_t paritysize, bool isResponse) {
	// get UID
	if (MifareAuthState == masNone) {
		if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && cmd[1] == 0x70) {
			ClearAuthData();
			AuthData.uid = bytes_to_num(&cmd[2], 4);
		}
		if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && cmd[1] == 0x70) {
			ClearAuthData();
			AuthData.uid = bytes_to_num(&cmd[2], 4);
		}
	}
	
	switch(MifareAuthState) {
		case masNt:
			if (cmdsize == 4 && isResponse) {
				snprintf(exp,size,"AUTH: nt %s", (AuthData.first_auth) ? "" : "(enc)");
				MifareAuthState = masNrAr;
				if (AuthData.first_auth)
					AuthData.nt = bytes_to_num(cmd, 4);
				else
					AuthData.nt_enc = bytes_to_num(cmd, 4);
					AuthData.nt_enc_par = parity[0];
				return;
			} else {
				MifareAuthState = masError;
			}
			break;
		case masNrAr:
			if (cmdsize == 8 && !isResponse) {
				snprintf(exp,size,"AUTH: nr ar (enc)");
				MifareAuthState = masAt;
				AuthData.nr_enc = bytes_to_num(cmd, 4);
				AuthData.ar_enc = bytes_to_num(&cmd[4], 4);
				AuthData.ar_enc_par = parity[0] << 4;
				return;
			} else {
				MifareAuthState = masError;
			}
			break;
		case masAt:
			if (cmdsize == 4 && isResponse) {
				snprintf(exp,size,"AUTH: at (enc)");
				MifareAuthState = masAuthComplete;
				AuthData.at_enc = bytes_to_num(cmd, 4);
				AuthData.at_enc_par = parity[0];
				return;
			} else {
				MifareAuthState = masError;
			}
			break;
		default:
			break;
	}
	
	if (!isResponse && ((MifareAuthState == masNone) || (MifareAuthState == masError)))
		annotateIso14443a(exp, size, cmd, cmdsize);
	
}

bool DecodeMifareData(uint8_t *cmd, uint8_t cmdsize, bool isResponse, uint8_t *mfData, size_t *mfDataLen) {
	static struct Crypto1State *traceCrypto1;	
	static uint64_t mfLastKey;
	
	*mfDataLen = 0;
	
	if (MifareAuthState == masAuthComplete) {
		if (traceCrypto1) {
			crypto1_destroy(traceCrypto1);
		}

		MifareAuthState = masFirstData;
		return false;
	}
	
	if (cmdsize > 32)
		return false;
	
	if (MifareAuthState == masFirstData) {
		if (AuthData.first_auth) {
			uint32_t ks2 = AuthData.ar_enc ^ prng_successor(AuthData.nt, 64);
			uint32_t ks3 = AuthData.at_enc ^ prng_successor(AuthData.nt, 96);
			struct Crypto1State *revstate = lfsr_recovery64(ks2, ks3);
			lfsr_rollback_word(revstate, 0, 0);
			lfsr_rollback_word(revstate, 0, 0);
			lfsr_rollback_word(revstate, AuthData.nr_enc, 1);
			lfsr_rollback_word(revstate, AuthData.uid ^ AuthData.nt, 0);

			uint64_t lfsr = 0;
			crypto1_get_lfsr(revstate, &lfsr);
			crypto1_destroy(revstate);
			mfLastKey = lfsr;
			PrintAndLog("            |          * | key | probable key:%x%x Prng:%s   ks2:%08x ks3:%08x |     |", 
				(unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF), 
				validate_prng_nonce(AuthData.nt) ? "WEAK": "HARD",
				ks2,
				ks3);
			
			AuthData.first_auth = false;

			traceCrypto1 = lfsr_recovery64(ks2, ks3);
		} else {
			printf("uid:%x nt:%x ar_enc:%x at_enc:%x\n", AuthData.uid, AuthData.nt, AuthData.ar_enc, AuthData.at_enc);
			
			// check last used key
			if (mfLastKey) {
				if (NestedCheckKey(mfLastKey, &AuthData, cmd, cmdsize)) {
				};
			}
			
			// check default keys
			if (!traceCrypto1) {
				for (int defaultKeyCounter = 0; defaultKeyCounter < MifareDefaultKeysSize; defaultKeyCounter++){
					if (NestedCheckKey(MifareDefaultKeys[defaultKeyCounter], &AuthData, cmd, cmdsize)) {
						
						break;
					};
				}
			}
			
			// nested
			if (!traceCrypto1 && validate_prng_nonce(AuthData.nt)) {
				uint32_t ntx = prng_successor(AuthData.nt, 90);
				for (int i = 0; i < 16383; i++) {
					ntx = prng_successor(ntx, 1);
					if (NTParityChk(&AuthData, ntx)){

						uint32_t ks2 = AuthData.ar_enc ^ prng_successor(ntx, 64);
						uint32_t ks3 = AuthData.at_enc ^ prng_successor(ntx, 96);
						struct Crypto1State *pcs = lfsr_recovery64(ks2, ks3);
						memcpy(mfData, cmd, cmdsize);
						mf_crypto1_decrypt(pcs, mfData, cmdsize, 0);
				
						crypto1_destroy(pcs);
						if (CheckCrc14443(CRC_14443_A, mfData, cmdsize)) {
							traceCrypto1 = lfsr_recovery64(ks2, ks3);
							break;
						}
					}						
				}
				if (traceCrypto1)
					printf("key> nt=%08x nonce distance=%d \n", ntx, nonce_distance(AuthData.nt, ntx));
				else
					printf("key> don't have any valid nt( \n");					
			}
			
			//hardnested
			if (!traceCrypto1) {
			}
		}
		
		
		MifareAuthState = masData;
	}
	
	if (MifareAuthState == masData && traceCrypto1) {
		memcpy(mfData, cmd, cmdsize);
		mf_crypto1_decrypt(traceCrypto1, mfData, cmdsize, 0);
		*mfDataLen = cmdsize;
	}
	
	return *mfDataLen > 0;
}

bool NTParityChk(TAuthData *ad, uint32_t ntx) {
	if (
		(oddparity8(ntx >> 8 & 0xff) ^ (ntx & 0x01) ^ ((ad->nt_enc_par >> 5) & 0x01) ^ (ad->nt_enc & 0x01)) ||
		(oddparity8(ntx >> 16 & 0xff) ^ (ntx >> 8 & 0x01) ^ ((ad->nt_enc_par >> 6) & 0x01) ^ (ad->nt_enc >> 8 & 0x01)) ||
		(oddparity8(ntx >> 24 & 0xff) ^ (ntx >> 16 & 0x01) ^ ((ad->nt_enc_par >> 7) & 0x01) ^ (ad->nt_enc >> 16 & 0x01))
		)
		return false;
	
	uint32_t ar = prng_successor(ntx, 64);
	if (
		(oddparity8(ar >> 8 & 0xff) ^ (ar & 0x01) ^ ((ad->ar_enc_par >> 5) & 0x01) ^ (ad->ar_enc & 0x01)) ||
		(oddparity8(ar >> 16 & 0xff) ^ (ar >> 8 & 0x01) ^ ((ad->ar_enc_par >> 6) & 0x01) ^ (ad->ar_enc >> 8 & 0x01)) ||
		(oddparity8(ar >> 24 & 0xff) ^ (ar >> 16 & 0x01) ^ ((ad->ar_enc_par >> 7) & 0x01) ^ (ad->ar_enc >> 16 & 0x01))
		)
		return false;

	uint32_t at = prng_successor(ntx, 96);
	if (
		(oddparity8(ar & 0xff) ^ (at >> 24 & 0x01) ^ ((ad->ar_enc_par >> 4) & 0x01) ^ (ad->at_enc >> 24 & 0x01)) ||
		(oddparity8(at >> 8 & 0xff) ^ (at & 0x01) ^ ((ad->at_enc_par >> 5) & 0x01) ^ (ad->at_enc & 0x01)) ||
		(oddparity8(at >> 16 & 0xff) ^ (at >> 8 & 0x01) ^ ((ad->at_enc_par >> 6) & 0x01) ^ (ad->at_enc >> 8 & 0x01)) ||
		(oddparity8(at >> 24 & 0xff) ^ (at >> 16 & 0x01) ^ ((ad->at_enc_par >> 7) & 0x01) ^ (ad->at_enc >> 16 & 0x01))
		)
		return false;
		
	return true;
}

bool NestedCheckKey(uint64_t key, TAuthData *ad, uint8_t *cmd, uint8_t cmdsize) {
	uint8_t buf[32] = {0};
	struct Crypto1State *pcs;
	
	pcs = crypto1_create(key);
	uint32_t nt1 = crypto1_word(pcs, ad->nt_enc ^ ad->uid, 1) ^ ad->nt_enc;
	uint32_t ar = prng_successor(nt1, 64);
	uint32_t at = prng_successor(nt1, 96);
	printf("key> nested auth uid: %08x nt: %08x nt_parity: %s ar: %08x at: %08x\n", ad->uid, nt1, printBitsPar(&ad->nt_enc_par, 4), ar, at);
	uint32_t nr1 = crypto1_word(pcs, ad->nr_enc, 1) ^ ad->nr_enc;
	uint32_t ar1 = crypto1_word(pcs, 0, 0) ^ ad->ar_enc;
	uint32_t at1 = crypto1_word(pcs, 0, 0) ^ ad->at_enc;
	printf("key> the same key test. nr1: %08x ar1: %08x at1: %08x \n", nr1, ar1, at1);

	if (NTParityChk(ad, nt1))
		printf("key> the same key test OK. key=%x%x\n", (unsigned int)((key & 0xFFFFFFFF00000000) >> 32), (unsigned int)(key & 0xFFFFFFFF));
	else {
		printf("key> the same key test. check nt parity error.\n");
		return false;
	}

	memcpy(buf, cmd, cmdsize);
	mf_crypto1_decrypt(pcs, buf, cmdsize, 0);
	
	crypto1_destroy(pcs);
	
	return CheckCrc14443(CRC_14443_A, buf, cmdsize);
}
Commit	Line	Data
4f131b53	1	//-----------------------------------------------------------------------------
	2	// Copyright (C) Merlok - 2017
	3	//
	4	// This code is licensed to you under the terms of the GNU GPL, version 2 or,
	5	// at your option, any later version. See the LICENSE.txt file for the text of
	6	// the license.
	7	//-----------------------------------------------------------------------------
	8	// Command: hf mf list. It shows data from arm buffer.
	9	//-----------------------------------------------------------------------------
	10
	11	#include "cmdhflist.h"
	12
	13	#include <stdlib.h>
	14	#include <stdio.h>
	15	#include <string.h>
6612a5a2	16	#include <stdint.h>
	17	#include <stdbool.h>
	18	#include "util.h"
	19	#include "data.h"
	20	#include "ui.h"
	21	#include "iso14443crc.h"
	22	#include "parity.h"
	23	#include "protocols.h"
7b215d14 OM	24	#include "crapto1/crapto1.h"
7b215d14 OM	25	#include "mifarehost.h"
c6a886fb	26	#include "mifaredefault.h"
4f131b53	27
4f131b53	28
6612a5a2	29	enum MifareAuthSeq {
	30	masNone,
	31	masNt,
	32	masNrAr,
	33	masAt,
747885a6	34	masAuthComplete,
aadc6bf1	35	masFirstData,
6612a5a2	36	masData,
6612a5a2	37	masError,
	38	};
	39	static enum MifareAuthSeq MifareAuthState;
aadc6bf1 OM	40	static TAuthData AuthData;
	41
	42	void ClearAuthData() {
	43	AuthData.uid = 0;
	44	AuthData.nt = 0;
7b215d14	45	AuthData.first_auth = true;
aadc6bf1	46	}
6612a5a2	47
	48	/**
	49	* @brief iso14443A_CRC_check Checks CRC in command or response
	50	* @param isResponse
	51	* @param data
	52	* @param len
	53	* @return 0 : CRC-command, CRC not ok
	54	* 1 : CRC-command, CRC ok
	55	* 2 : Not crc-command
	56	*/
	57	uint8_t iso14443A_CRC_check(bool isResponse, uint8_t* data, uint8_t len)
	58	{
	59	uint8_t b1,b2;
	60
	61	if(len <= 2) return 2;
	62
	63	if(isResponse & (len < 6)) return 2;
	64
	65	ComputeCrc14443(CRC_14443_A, data, len-2, &b1, &b2);
	66	if (b1 != data[len-2] \|\| b2 != data[len-1]) {
	67	return 0;
	68	} else {
	69	return 1;
	70	}
	71	}
	72
	73	uint8_t mifare_CRC_check(bool isResponse, uint8_t* data, uint8_t len)
	74	{
	75	switch(MifareAuthState) {
	76	case masNone:
6612a5a2	77	case masError:
	78	return iso14443A_CRC_check(isResponse, data, len);
	79	default:
	80	return 2;
	81	}
6612a5a2	82	}
	83
	84	void annotateIso14443a(char exp, size_t size, uint8_t cmd, uint8_t cmdsize)
	85	{
	86	switch(cmd[0])
	87	{
a31f7f89 OM	88	case ISO14443A_CMD_WUPA:
	89	snprintf(exp,size,"WUPA");
	90	MifareAuthState = masNone;
	91	break;
6612a5a2	92	case ISO14443A_CMD_ANTICOLL_OR_SELECT:{
	93	// 93 20 = Anticollision (usage: 9320 - answer: 4bytes UID+1byte UID-bytes-xor)
	94	// 93 70 = Select (usage: 9370+5bytes 9320 answer - answer: 1byte SAK)
	95	if(cmd[1] == 0x70)
	96	{
	97	snprintf(exp,size,"SELECT_UID"); break;
	98	}else
	99	{
	100	snprintf(exp,size,"ANTICOLL"); break;
	101	}
	102	}
	103	case ISO14443A_CMD_ANTICOLL_OR_SELECT_2:{
	104	//95 20 = Anticollision of cascade level2
	105	//95 70 = Select of cascade level2
	106	if(cmd[2] == 0x70)
	107	{
	108	snprintf(exp,size,"SELECT_UID-2"); break;
	109	}else
	110	{
	111	snprintf(exp,size,"ANTICOLL-2"); break;
	112	}
	113	}
a31f7f89 OM	114	case ISO14443A_CMD_REQA:
	115	snprintf(exp,size,"REQA");
	116	MifareAuthState = masNone;
	117	break;
6612a5a2	118	case ISO14443A_CMD_READBLOCK: snprintf(exp,size,"READBLOCK(%d)",cmd[1]); break;
	119	case ISO14443A_CMD_WRITEBLOCK: snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]); break;
	120	case ISO14443A_CMD_HALT:
	121	snprintf(exp,size,"HALT");
	122	MifareAuthState = masNone;
	123	break;
	124	case ISO14443A_CMD_RATS: snprintf(exp,size,"RATS"); break;
	125	case MIFARE_CMD_INC: snprintf(exp,size,"INC(%d)",cmd[1]); break;
	126	case MIFARE_CMD_DEC: snprintf(exp,size,"DEC(%d)",cmd[1]); break;
	127	case MIFARE_CMD_RESTORE: snprintf(exp,size,"RESTORE(%d)",cmd[1]); break;
	128	case MIFARE_CMD_TRANSFER: snprintf(exp,size,"TRANSFER(%d)",cmd[1]); break;
	129	case MIFARE_AUTH_KEYA:
	130	if ( cmdsize > 3) {
	131	snprintf(exp,size,"AUTH-A(%d)",cmd[1]);
	132	MifareAuthState = masNt;
	133	} else {
	134	// case MIFARE_ULEV1_VERSION : both 0x60.
	135	snprintf(exp,size,"EV1 VERSION");
	136	}
	137	break;
	138	case MIFARE_AUTH_KEYB:
	139	MifareAuthState = masNt;
	140	snprintf(exp,size,"AUTH-B(%d)",cmd[1]);
	141	break;
	142	case MIFARE_MAGICWUPC1: snprintf(exp,size,"MAGIC WUPC1"); break;
	143	case MIFARE_MAGICWUPC2: snprintf(exp,size,"MAGIC WUPC2"); break;
	144	case MIFARE_MAGICWIPEC: snprintf(exp,size,"MAGIC WIPEC"); break;
	145	case MIFARE_ULC_AUTH_1: snprintf(exp,size,"AUTH "); break;
	146	case MIFARE_ULC_AUTH_2: snprintf(exp,size,"AUTH_ANSW"); break;
	147	case MIFARE_ULEV1_AUTH:
	148	if ( cmdsize == 7 )
	149	snprintf(exp,size,"PWD-AUTH KEY: 0x%02x%02x%02x%02x", cmd[1], cmd[2], cmd[3], cmd[4] );
	150	else
	151	snprintf(exp,size,"PWD-AUTH");
	152	break;
	153	case MIFARE_ULEV1_FASTREAD:{
	154	if ( cmdsize >=3 && cmd[2] <= 0xE6)
	155	snprintf(exp,size,"READ RANGE (%d-%d)",cmd[1],cmd[2]);
	156	else
	157	snprintf(exp,size,"?");
	158	break;
	159	}
	160	case MIFARE_ULC_WRITE:{
	161	if ( cmd[1] < 0x21 )
	162	snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]);
	163	else
	164	snprintf(exp,size,"?");
	165	break;
	166	}
	167	case MIFARE_ULEV1_READ_CNT:{
	168	if ( cmd[1] < 5 )
	169	snprintf(exp,size,"READ CNT(%d)",cmd[1]);
	170	else
	171	snprintf(exp,size,"?");
	172	break;
	173	}
	174	case MIFARE_ULEV1_INCR_CNT:{
	175	if ( cmd[1] < 5 )
	176	snprintf(exp,size,"INCR(%d)",cmd[1]);
	177	else
	178	snprintf(exp,size,"?");
	179	break;
	180	}
	181	case MIFARE_ULEV1_READSIG: snprintf(exp,size,"READ_SIG"); break;
182	case MIFARE_ULEV1_CHECKTEAR: snprintf(exp,size,"CHK_TEARING(%d)",cmd[1]); break;
183	case MIFARE_ULEV1_VCSL: snprintf(exp,size,"VCSL"); break;
184	default: snprintf(exp,size,"?"); break;
185	}
186	return;
187	}
188
b957bcd3	189	void annotateMifare(char exp, size_t size, uint8_t cmd, uint8_t cmdsize, uint8_t* parity, uint8_t paritysize, bool isResponse) {
aadc6bf1 OM	190	// get UID
aadc6bf1 OM	191	if (MifareAuthState == masNone) {
7b215d14	192	if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && cmd[1] == 0x70) {
aadc6bf1 OM	193	ClearAuthData();
	194	AuthData.uid = bytes_to_num(&cmd[2], 4);
	195	}
7b215d14	196	if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && cmd[1] == 0x70) {
aadc6bf1 OM	197	ClearAuthData();
	198	AuthData.uid = bytes_to_num(&cmd[2], 4);
	199	}
	200	}
	201
6612a5a2	202	switch(MifareAuthState) {
6612a5a2	203	case masNt:
fb30f5a1	204	if (cmdsize == 4 && isResponse) {
aadc6bf1	205	snprintf(exp,size,"AUTH: nt %s", (AuthData.first_auth) ? "" : "(enc)");
6612a5a2	206	MifareAuthState = masNrAr;
aadc6bf1	207	if (AuthData.first_auth)
7b215d14	208	AuthData.nt = bytes_to_num(cmd, 4);
aadc6bf1	209	else
7b215d14	210	AuthData.nt_enc = bytes_to_num(cmd, 4);
b957bcd3	211	AuthData.nt_enc_par = parity[0];
6612a5a2	212	return;
	213	} else {
	214	MifareAuthState = masError;
6612a5a2	215	}
	216	break;
	217	case masNrAr:
fb30f5a1	218	if (cmdsize == 8 && !isResponse) {
6c30a244	219	snprintf(exp,size,"AUTH: nr ar (enc)");
6612a5a2	220	MifareAuthState = masAt;
7b215d14 OM	221	AuthData.nr_enc = bytes_to_num(cmd, 4);
7b215d14 OM	222	AuthData.ar_enc = bytes_to_num(&cmd[4], 4);
b957bcd3	223	AuthData.ar_enc_par = parity[0] << 4;
6612a5a2	224	return;
	225	} else {
	226	MifareAuthState = masError;
	227	}
	228	break;
	229	case masAt:
fb30f5a1	230	if (cmdsize == 4 && isResponse) {
6c30a244	231	snprintf(exp,size,"AUTH: at (enc)");
747885a6	232	MifareAuthState = masAuthComplete;
7b215d14	233	AuthData.at_enc = bytes_to_num(cmd, 4);
b957bcd3	234	AuthData.at_enc_par = parity[0];
6612a5a2	235	return;
	236	} else {
	237	MifareAuthState = masError;
	238	}
	239	break;
	240	default:
	241	break;
	242	}
	243
747885a6	244	if (!isResponse && ((MifareAuthState == masNone) \|\| (MifareAuthState == masError)))
6612a5a2	245	annotateIso14443a(exp, size, cmd, cmdsize);
	246
	247	}
7b215d14 OM	248
7b215d14 OM	249	bool DecodeMifareData(uint8_t cmd, uint8_t cmdsize, bool isResponse, uint8_t mfData, size_t *mfDataLen) {
747885a6	250	static struct Crypto1State *traceCrypto1;
dca8220f	251	static uint64_t mfLastKey;
747885a6	252
7b215d14 OM	253	*mfDataLen = 0;
7b215d14 OM	254
747885a6 OM	255	if (MifareAuthState == masAuthComplete) {
	256	if (traceCrypto1) {
	257	crypto1_destroy(traceCrypto1);
	258	}
	259
	260	MifareAuthState = masFirstData;
	261	return false;
	262	}
	263
7b215d14 OM	264	if (cmdsize > 32)
	265	return false;
	266
	267	if (MifareAuthState == masFirstData) {
	268	if (AuthData.first_auth) {
	269	uint32_t ks2 = AuthData.ar_enc ^ prng_successor(AuthData.nt, 64);
	270	uint32_t ks3 = AuthData.at_enc ^ prng_successor(AuthData.nt, 96);
	271	struct Crypto1State *revstate = lfsr_recovery64(ks2, ks3);
	272	lfsr_rollback_word(revstate, 0, 0);
	273	lfsr_rollback_word(revstate, 0, 0);
	274	lfsr_rollback_word(revstate, AuthData.nr_enc, 1);
	275	lfsr_rollback_word(revstate, AuthData.uid ^ AuthData.nt, 0);
	276
	277	uint64_t lfsr = 0;
	278	crypto1_get_lfsr(revstate, &lfsr);
	279	crypto1_destroy(revstate);
747885a6	280	mfLastKey = lfsr;
28ee794f	281	PrintAndLog(" \| * \| key \| probable key:%x%x Prng:%s ks2:%08x ks3:%08x \| \|",
7b215d14	282	(unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF),
28ee794f	283	validate_prng_nonce(AuthData.nt) ? "WEAK": "HARD",
7b215d14 OM	284	ks2,
	285	ks3);
	286
	287	AuthData.first_auth = false;
747885a6 OM	288
747885a6 OM	289	traceCrypto1 = lfsr_recovery64(ks2, ks3);
7b215d14	290	} else {
28ee794f	291	printf("uid:%x nt:%x ar_enc:%x at_enc:%x\n", AuthData.uid, AuthData.nt, AuthData.ar_enc, AuthData.at_enc);
747885a6 OM	292
	293	// check last used key
	294	if (mfLastKey) {
c6a886fb OM	295	if (NestedCheckKey(mfLastKey, &AuthData, cmd, cmdsize)) {
c6a886fb OM	296	};
747885a6 OM	297	}
	298
	299	// check default keys
7bea1581 OM	300	if (!traceCrypto1) {
	301	for (int defaultKeyCounter = 0; defaultKeyCounter < MifareDefaultKeysSize; defaultKeyCounter++){
	302	if (NestedCheckKey(MifareDefaultKeys[defaultKeyCounter], &AuthData, cmd, cmdsize)) {
	303
	304	break;
	305	};
	306	}
c6a886fb	307	}
747885a6 OM	308
747885a6 OM	309	// nested
7bea1581 OM	310	if (!traceCrypto1 && validate_prng_nonce(AuthData.nt)) {
	311	uint32_t ntx = prng_successor(AuthData.nt, 90);
	312	for (int i = 0; i < 16383; i++) {
	313	ntx = prng_successor(ntx, 1);
	314	if (NTParityChk(&AuthData, ntx)){
	315
	316	uint32_t ks2 = AuthData.ar_enc ^ prng_successor(ntx, 64);
	317	uint32_t ks3 = AuthData.at_enc ^ prng_successor(ntx, 96);
	318	struct Crypto1State *pcs = lfsr_recovery64(ks2, ks3);
	319	memcpy(mfData, cmd, cmdsize);
	320	mf_crypto1_decrypt(pcs, mfData, cmdsize, 0);
	321
	322	crypto1_destroy(pcs);
	323	if (CheckCrc14443(CRC_14443_A, mfData, cmdsize)) {
	324	traceCrypto1 = lfsr_recovery64(ks2, ks3);
	325	break;
	326	}
	327	}
	328	}
	329	if (traceCrypto1)
	330	printf("key> nt=%08x nonce distance=%d \n", ntx, nonce_distance(AuthData.nt, ntx));
	331	else
	332	printf("key> don't have any valid nt( \n");
747885a6 OM	333	}
	334
	335	//hardnested
7bea1581 OM	336	if (!traceCrypto1) {
7bea1581 OM	337	}
7b215d14 OM	338	}
	339
	340
	341
	342	MifareAuthState = masData;
7b215d14 OM	343	}
7b215d14 OM	344
747885a6 OM	345	if (MifareAuthState == masData && traceCrypto1) {
	346	memcpy(mfData, cmd, cmdsize);
	347	mf_crypto1_decrypt(traceCrypto1, mfData, cmdsize, 0);
	348	*mfDataLen = cmdsize;
7b215d14 OM	349	}
	350
	351	return *mfDataLen > 0;
	352	}
	353
dca8220f OM	354	bool NTParityChk(TAuthData *ad, uint32_t ntx) {
	355	if (
	356	(oddparity8(ntx >> 8 & 0xff) ^ (ntx & 0x01) ^ ((ad->nt_enc_par >> 5) & 0x01) ^ (ad->nt_enc & 0x01)) \|\|
	357	(oddparity8(ntx >> 16 & 0xff) ^ (ntx >> 8 & 0x01) ^ ((ad->nt_enc_par >> 6) & 0x01) ^ (ad->nt_enc >> 8 & 0x01)) \|\|
	358	(oddparity8(ntx >> 24 & 0xff) ^ (ntx >> 16 & 0x01) ^ ((ad->nt_enc_par >> 7) & 0x01) ^ (ad->nt_enc >> 16 & 0x01))
	359	)
	360	return false;
	361
	362	uint32_t ar = prng_successor(ntx, 64);
	363	if (
	364	(oddparity8(ar >> 8 & 0xff) ^ (ar & 0x01) ^ ((ad->ar_enc_par >> 5) & 0x01) ^ (ad->ar_enc & 0x01)) \|\|
	365	(oddparity8(ar >> 16 & 0xff) ^ (ar >> 8 & 0x01) ^ ((ad->ar_enc_par >> 6) & 0x01) ^ (ad->ar_enc >> 8 & 0x01)) \|\|
	366	(oddparity8(ar >> 24 & 0xff) ^ (ar >> 16 & 0x01) ^ ((ad->ar_enc_par >> 7) & 0x01) ^ (ad->ar_enc >> 16 & 0x01))
	367	)
	368	return false;
	369
	370	uint32_t at = prng_successor(ntx, 96);
	371	if (
	372	(oddparity8(ar & 0xff) ^ (at >> 24 & 0x01) ^ ((ad->ar_enc_par >> 4) & 0x01) ^ (ad->at_enc >> 24 & 0x01)) \|\|
	373	(oddparity8(at >> 8 & 0xff) ^ (at & 0x01) ^ ((ad->at_enc_par >> 5) & 0x01) ^ (ad->at_enc & 0x01)) \|\|
	374	(oddparity8(at >> 16 & 0xff) ^ (at >> 8 & 0x01) ^ ((ad->at_enc_par >> 6) & 0x01) ^ (ad->at_enc >> 8 & 0x01)) \|\|
	375	(oddparity8(at >> 24 & 0xff) ^ (at >> 16 & 0x01) ^ ((ad->at_enc_par >> 7) & 0x01) ^ (ad->at_enc >> 16 & 0x01))
	376	)
	377	return false;
	378
	379	return true;
	380	}
	381
c6a886fb	382	bool NestedCheckKey(uint64_t key, TAuthData ad, uint8_t cmd, uint8_t cmdsize) {
dca8220f OM	383	uint8_t buf[32] = {0};
	384	struct Crypto1State *pcs;
	385
	386	pcs = crypto1_create(key);
	387	uint32_t nt1 = crypto1_word(pcs, ad->nt_enc ^ ad->uid, 1) ^ ad->nt_enc;
	388	uint32_t ar = prng_successor(nt1, 64);
	389	uint32_t at = prng_successor(nt1, 96);
	390	printf("key> nested auth uid: %08x nt: %08x nt_parity: %s ar: %08x at: %08x\n", ad->uid, nt1, printBitsPar(&ad->nt_enc_par, 4), ar, at);
	391	uint32_t nr1 = crypto1_word(pcs, ad->nr_enc, 1) ^ ad->nr_enc;
	392	uint32_t ar1 = crypto1_word(pcs, 0, 0) ^ ad->ar_enc;
	393	uint32_t at1 = crypto1_word(pcs, 0, 0) ^ ad->at_enc;
	394	printf("key> the same key test. nr1: %08x ar1: %08x at1: %08x \n", nr1, ar1, at1);
	395
	396	if (NTParityChk(ad, nt1))
	397	printf("key> the same key test OK. key=%x%x\n", (unsigned int)((key & 0xFFFFFFFF00000000) >> 32), (unsigned int)(key & 0xFFFFFFFF));
	398	else {
	399	printf("key> the same key test. check nt parity error.\n");
	400	return false;
	401	}
	402
	403	memcpy(buf, cmd, cmdsize);
	404	mf_crypto1_decrypt(pcs, buf, cmdsize, 0);
	405
e0158d33 OM	406	crypto1_destroy(pcs);
e0158d33 OM	407
dca8220f	408	return CheckCrc14443(CRC_14443_A, buf, cmdsize);
c6a886fb	409	}