[proxmark3-svn] / armsrc / mifareutil.c

//-----------------------------------------------------------------------------\r
// Merlok, May 2011\r
// Many authors, that makes it possible\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
// code for work with mifare cards.\r
//-----------------------------------------------------------------------------\r
\r
#include "proxmark3.h"\r
#include "apps.h"\r
#include "util.h"\r
#include "string.h"\r
\r
#include "iso14443crc.h"\r
#include "iso14443a.h"\r
#include "crapto1.h"\r
#include "mifareutil.h"\r
\r
int MF_DBGLEVEL = MF_DBG_ALL;\r
\r
uint8_t* mifare_get_bigbufptr(void) {\r
	return (((uint8_t *)BigBuf) + 3560);	// was 3560 - tied to other size changes\r
}\r
\r
int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer)\r
{\r
	return mifare_sendcmd_shortex(pcs, crypted, cmd, data, answer, NULL);\r
}\r
\r
int mifare_sendcmd_shortex(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer, uint32_t * parptr)\r
{\r
	uint8_t dcmd[4], ecmd[4];\r
	uint32_t pos, par, res;\r
\r
	dcmd[0] = cmd;\r
	dcmd[1] = data;\r
	AppendCrc14443a(dcmd, 2);\r
	\r
	memcpy(ecmd, dcmd, sizeof(dcmd));\r
	\r
	if (crypted) {\r
		par = 0;\r
		for (pos = 0; pos < 4; pos++)\r
		{\r
			ecmd[pos] = crypto1_byte(pcs, 0x00, 0) ^ dcmd[pos];\r
			par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(dcmd[pos])) & 0x01) * 0x08 );\r
		}	\r
\r
		ReaderTransmitPar(ecmd, sizeof(ecmd), par);\r
\r
	} else {\r
		ReaderTransmit(dcmd, sizeof(dcmd));\r
	}\r
\r
	int len = ReaderReceivePar(answer, &par);\r
	\r
	if (parptr) *parptr = par;\r
\r
	if (crypted == CRYPT_ALL) {\r
		if (len == 1) {\r
			res = 0;\r
			for (pos = 0; pos < 4; pos++)\r
				res |= (crypto1_bit(pcs, 0, 0) ^ BIT(answer[0], pos)) << pos;\r
				\r
			answer[0] = res;\r
			\r
		} else {\r
			for (pos = 0; pos < len; pos++)\r
			{\r
				answer[pos] = crypto1_byte(pcs, 0x00, 0) ^ answer[pos];\r
			}\r
		}\r
	}\r
	\r
	return len;\r
}\r
\r
int mifare_classic_auth(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint64_t isNested) \r
{\r
	return mifare_classic_authex(pcs, uid, blockNo, keyType, ui64Key, isNested, NULL);\r
}\r
\r
int mifare_classic_authex(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint64_t isNested, uint32_t * ntptr) \r
{\r
	// variables\r
	int len;	\r
	uint32_t pos;\r
	uint8_t tmp4[4];\r
	byte_t par = 0;\r
	byte_t ar[4];\r
	uint32_t nt, ntpp; // Supplied tag nonce\r
	\r
	uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };\r
	uint8_t* receivedAnswer = mifare_get_bigbufptr();\r
\r
	// Transmit MIFARE_CLASSIC_AUTH\r
	len = mifare_sendcmd_short(pcs, isNested, 0x60 + (keyType & 0x01), blockNo, receivedAnswer);\r
  if (MF_DBGLEVEL >= 4)	Dbprintf("rand nonce len: %x", len);  \r
	if (len != 4) return 1;\r
	\r
	ar[0] = 0x55;\r
	ar[1] = 0x41;\r
	ar[2] = 0x49;\r
	ar[3] = 0x92; \r
	\r
	// Save the tag nonce (nt)\r
	nt = bytes_to_num(receivedAnswer, 4);\r
\r
	//  ----------------------------- crypto1 create\r
	if (isNested)\r
		crypto1_destroy(pcs);\r
\r
	// Init cipher with key\r
	crypto1_create(pcs, ui64Key);\r
\r
	if (isNested == AUTH_NESTED) {\r
		// decrypt nt with help of new key \r
		nt = crypto1_word(pcs, nt ^ uid, 1) ^ nt;\r
	} else {\r
		// Load (plain) uid^nt into the cipher\r
		crypto1_word(pcs, nt ^ uid, 0);\r
	}\r
\r
	// some statistic\r
	if (!ntptr && (MF_DBGLEVEL >= 3))\r
		Dbprintf("auth uid: %08x nt: %08x", uid, nt);  \r
	\r
	// save Nt\r
	if (ntptr)\r
		*ntptr = nt;\r
\r
	par = 0;\r
	// Generate (encrypted) nr+parity by loading it into the cipher (Nr)\r
	for (pos = 0; pos < 4; pos++)\r
	{\r
		mf_nr_ar[pos] = crypto1_byte(pcs, ar[pos], 0) ^ ar[pos];\r
		par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(ar[pos])) & 0x01) * 0x80 );\r
	}	\r
		\r
	// Skip 32 bits in pseudo random generator\r
	nt = prng_successor(nt,32);\r
\r
	//  ar+parity\r
	for (pos = 4; pos < 8; pos++)\r
	{\r
		nt = prng_successor(nt,8);\r
		mf_nr_ar[pos] = crypto1_byte(pcs,0x00,0) ^ (nt & 0xff);\r
		par = (par >> 1)| ( ((filter(pcs->odd) ^ oddparity(nt & 0xff)) & 0x01) * 0x80 );\r
	}	\r
		\r
	// Transmit reader nonce and reader answer\r
	ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par);\r
\r
	// Receive 4 bit answer\r
	len = ReaderReceive(receivedAnswer);\r
	if (!len)\r
	{\r
		if (MF_DBGLEVEL >= 1)	Dbprintf("Authentication failed. Card timeout.");\r
		return 2;\r
	}\r
	\r
	memcpy(tmp4, receivedAnswer, 4);\r
	ntpp = prng_successor(nt, 32) ^ crypto1_word(pcs, 0,0);\r
	\r
	if (ntpp != bytes_to_num(tmp4, 4)) {\r
		if (MF_DBGLEVEL >= 1)	Dbprintf("Authentication failed. Error card response.");\r
		return 3;\r
	}\r
\r
	return 0;\r
}\r
\r
int mifare_classic_readblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData) \r
{\r
	// variables\r
	int len;	\r
	uint8_t	bt[2];\r
	\r
	uint8_t* receivedAnswer = mifare_get_bigbufptr();\r
	\r
	// command MIFARE_CLASSIC_READBLOCK\r
	len = mifare_sendcmd_short(pcs, 1, 0x30, blockNo, receivedAnswer);\r
	if (len == 1) {\r
		if (MF_DBGLEVEL >= 1)	Dbprintf("Cmd Error: %02x", receivedAnswer[0]);  \r
		return 1;\r
	}\r
	if (len != 18) {\r
		if (MF_DBGLEVEL >= 1)	Dbprintf("Cmd Error: card timeout. len: %x", len);  \r
		return 2;\r
	}\r
\r
	memcpy(bt, receivedAnswer + 16, 2);\r
	AppendCrc14443a(receivedAnswer, 16);\r
	if (bt[0] != receivedAnswer[16] || bt[1] != receivedAnswer[17]) {\r
		if (MF_DBGLEVEL >= 1)	Dbprintf("Cmd CRC response error.");  \r
		return 3;\r
	}\r
	\r
	memcpy(blockData, receivedAnswer, 16);\r
	return 0;\r
}\r
\r
int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData) \r
{\r
	// variables\r
	int len, i;	\r
	uint32_t pos;\r
	uint32_t par = 0;\r
	byte_t res;\r
	\r
	uint8_t d_block[18], d_block_enc[18];\r
	uint8_t* receivedAnswer = mifare_get_bigbufptr();\r
	\r
	// command MIFARE_CLASSIC_WRITEBLOCK\r
	len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer);\r
\r
	if ((len != 1) || (receivedAnswer[0] != 0x0A)) {   //  0x0a - ACK\r
		if (MF_DBGLEVEL >= 1)	Dbprintf("Cmd Error: %02x", receivedAnswer[0]);  \r
		return 1;\r
	}\r
	\r
	memcpy(d_block, blockData, 16);\r
	AppendCrc14443a(d_block, 16);\r
	\r
	// crypto\r
	par = 0;\r
	for (pos = 0; pos < 18; pos++)\r
	{\r
		d_block_enc[pos] = crypto1_byte(pcs, 0x00, 0) ^ d_block[pos];\r
		par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(d_block[pos])) & 0x01) * 0x20000 );\r
	}	\r
\r
	ReaderTransmitPar(d_block_enc, sizeof(d_block_enc), par);\r
\r
	// Receive the response\r
	len = ReaderReceive(receivedAnswer);	\r
\r
	res = 0;\r
	for (i = 0; i < 4; i++)\r
		res |= (crypto1_bit(pcs, 0, 0) ^ BIT(receivedAnswer[0], i)) << i;\r
\r
	if ((len != 1) || (res != 0x0A)) {\r
		if (MF_DBGLEVEL >= 1)	Dbprintf("Cmd send data2 Error: %02x", res);  \r
		return 2;\r
	}\r
	\r
	return 0;\r
}\r
\r
int mifare_classic_halt(struct Crypto1State *pcs, uint32_t uid) \r
{\r
	// variables\r
	int len;	\r
	\r
	// Mifare HALT\r
	uint8_t* receivedAnswer = mifare_get_bigbufptr();\r
\r
	len = mifare_sendcmd_short(pcs, 1, 0x50, 0x00, receivedAnswer);\r
	if (len != 0) {\r
		if (MF_DBGLEVEL >= 1)	Dbprintf("halt error. response len: %x", len);  \r
		return 1;\r
	}\r
\r
	return 0;\r
}\r
Commit	Line	Data
20f9a2a1 M	1	//-----------------------------------------------------------------------------\r
	2	// Merlok, May 2011\r
	3	// Many authors, that makes it possible\r
	4	//\r
	5	// This code is licensed to you under the terms of the GNU GPL, version 2 or,\r
	6	// at your option, any later version. See the LICENSE.txt file for the text of\r
	7	// the license.\r
	8	//-----------------------------------------------------------------------------\r
	9	// code for work with mifare cards.\r
	10	//-----------------------------------------------------------------------------\r
	11	\r
	12	#include "proxmark3.h"\r
	13	#include "apps.h"\r
	14	#include "util.h"\r
	15	#include "string.h"\r
	16	\r
	17	#include "iso14443crc.h"\r
	18	#include "iso14443a.h"\r
	19	#include "crapto1.h"\r
	20	#include "mifareutil.h"\r
	21	\r
f397b5cc M	22	int MF_DBGLEVEL = MF_DBG_ALL;\r
f397b5cc M	23	\r
20f9a2a1 M	24	uint8_t* mifare_get_bigbufptr(void) {\r
	25	return (((uint8_t *)BigBuf) + 3560); // was 3560 - tied to other size changes\r
	26	}\r
	27	\r
	28	int mifare_sendcmd_short(struct Crypto1State pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t answer)\r
f89c7050 M	29	{\r
	30	return mifare_sendcmd_shortex(pcs, crypted, cmd, data, answer, NULL);\r
	31	}\r
	32	\r
	33	int mifare_sendcmd_shortex(struct Crypto1State pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t answer, uint32_t * parptr)\r
20f9a2a1 M	34	{\r
	35	uint8_t dcmd[4], ecmd[4];\r
	36	uint32_t pos, par, res;\r
	37	\r
	38	dcmd[0] = cmd;\r
	39	dcmd[1] = data;\r
	40	AppendCrc14443a(dcmd, 2);\r
	41	\r
	42	memcpy(ecmd, dcmd, sizeof(dcmd));\r
	43	\r
	44	if (crypted) {\r
	45	par = 0;\r
	46	for (pos = 0; pos < 4; pos++)\r
	47	{\r
	48	ecmd[pos] = crypto1_byte(pcs, 0x00, 0) ^ dcmd[pos];\r
	49	par = (par >> 1) \| ( ((filter(pcs->odd) ^ oddparity(dcmd[pos])) & 0x01) * 0x08 );\r
	50	} \r
	51	\r
	52	ReaderTransmitPar(ecmd, sizeof(ecmd), par);\r
	53	\r
	54	} else {\r
	55	ReaderTransmit(dcmd, sizeof(dcmd));\r
	56	}\r
	57	\r
f89c7050 M	58	int len = ReaderReceivePar(answer, &par);\r
	59	\r
	60	if (parptr) *parptr = par;\r
20f9a2a1	61	\r
4abe4f58	62	if (crypted == CRYPT_ALL) {\r
20f9a2a1 M	63	if (len == 1) {\r
	64	res = 0;\r
	65	for (pos = 0; pos < 4; pos++)\r
	66	res \|= (crypto1_bit(pcs, 0, 0) ^ BIT(answer[0], pos)) << pos;\r
	67	\r
	68	answer[0] = res;\r
	69	\r
	70	} else {\r
	71	for (pos = 0; pos < len; pos++)\r
	72	{\r
	73	answer[pos] = crypto1_byte(pcs, 0x00, 0) ^ answer[pos];\r
	74	}\r
	75	}\r
	76	}\r
	77	\r
	78	return len;\r
	79	}\r
	80	\r
	81	int mifare_classic_auth(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint64_t isNested) \r
f89c7050 M	82	{\r
	83	return mifare_classic_authex(pcs, uid, blockNo, keyType, ui64Key, isNested, NULL);\r
	84	}\r
	85	\r
	86	int mifare_classic_authex(struct Crypto1State pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint64_t isNested, uint32_t ntptr) \r
20f9a2a1 M	87	{\r
20f9a2a1 M	88	// variables\r
4abe4f58	89	int len; \r
20f9a2a1 M	90	uint32_t pos;\r
20f9a2a1 M	91	uint8_t tmp4[4];\r
4abe4f58 M	92	byte_t par = 0;\r
4abe4f58 M	93	byte_t ar[4];\r
20f9a2a1 M	94	uint32_t nt, ntpp; // Supplied tag nonce\r
	95	\r
	96	uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };\r
4abe4f58	97	uint8_t* receivedAnswer = mifare_get_bigbufptr();\r
20f9a2a1	98	\r
4abe4f58	99	// Transmit MIFARE_CLASSIC_AUTH\r
20f9a2a1	100	len = mifare_sendcmd_short(pcs, isNested, 0x60 + (keyType & 0x01), blockNo, receivedAnswer);\r
f397b5cc	101	if (MF_DBGLEVEL >= 4) Dbprintf("rand nonce len: %x", len); \r
4abe4f58	102	if (len != 4) return 1;\r
20f9a2a1 M	103	\r
	104	ar[0] = 0x55;\r
	105	ar[1] = 0x41;\r
	106	ar[2] = 0x49;\r
	107	ar[3] = 0x92; \r
	108	\r
	109	// Save the tag nonce (nt)\r
	110	nt = bytes_to_num(receivedAnswer, 4);\r
20f9a2a1 M	111	\r
20f9a2a1 M	112	// ----------------------------- crypto1 create\r
4abe4f58 M	113	if (isNested)\r
	114	crypto1_destroy(pcs);\r
	115	\r
	116	// Init cipher with key\r
20f9a2a1 M	117	crypto1_create(pcs, ui64Key);\r
20f9a2a1 M	118	\r
4abe4f58 M	119	if (isNested == AUTH_NESTED) {\r
	120	// decrypt nt with help of new key \r
	121	nt = crypto1_word(pcs, nt ^ uid, 1) ^ nt;\r
	122	} else {\r
	123	// Load (plain) uid^nt into the cipher\r
	124	crypto1_word(pcs, nt ^ uid, 0);\r
	125	}\r
	126	\r
	127	// some statistic\r
f397b5cc	128	if (!ntptr && (MF_DBGLEVEL >= 3))\r
f89c7050 M	129	Dbprintf("auth uid: %08x nt: %08x", uid, nt); \r
	130	\r
	131	// save Nt\r
	132	if (ntptr)\r
	133	*ntptr = nt;\r
20f9a2a1 M	134	\r
20f9a2a1 M	135	par = 0;\r
4abe4f58 M	136	// Generate (encrypted) nr+parity by loading it into the cipher (Nr)\r
	137	for (pos = 0; pos < 4; pos++)\r
	138	{\r
	139	mf_nr_ar[pos] = crypto1_byte(pcs, ar[pos], 0) ^ ar[pos];\r
20f9a2a1	140	par = (par >> 1) \| ( ((filter(pcs->odd) ^ oddparity(ar[pos])) & 0x01) * 0x80 );\r
4abe4f58	141	} \r
20f9a2a1	142	\r
4abe4f58 M	143	// Skip 32 bits in pseudo random generator\r
4abe4f58 M	144	nt = prng_successor(nt,32);\r
20f9a2a1 M	145	\r
20f9a2a1 M	146	// ar+parity\r
4abe4f58 M	147	for (pos = 4; pos < 8; pos++)\r
4abe4f58 M	148	{\r
20f9a2a1	149	nt = prng_successor(nt,8);\r
4abe4f58	150	mf_nr_ar[pos] = crypto1_byte(pcs,0x00,0) ^ (nt & 0xff);\r
20f9a2a1	151	par = (par >> 1)\| ( ((filter(pcs->odd) ^ oddparity(nt & 0xff)) & 0x01) * 0x80 );\r
4abe4f58	152	} \r
20f9a2a1	153	\r
4abe4f58 M	154	// Transmit reader nonce and reader answer\r
4abe4f58 M	155	ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par);\r
20f9a2a1	156	\r
4abe4f58	157	// Receive 4 bit answer\r
20f9a2a1	158	len = ReaderReceive(receivedAnswer);\r
4abe4f58 M	159	if (!len)\r
4abe4f58 M	160	{\r
f397b5cc	161	if (MF_DBGLEVEL >= 1) Dbprintf("Authentication failed. Card timeout.");\r
20f9a2a1	162	return 2;\r
4abe4f58	163	}\r
20f9a2a1	164	\r
4abe4f58	165	memcpy(tmp4, receivedAnswer, 4);\r
20f9a2a1 M	166	ntpp = prng_successor(nt, 32) ^ crypto1_word(pcs, 0,0);\r
	167	\r
	168	if (ntpp != bytes_to_num(tmp4, 4)) {\r
f397b5cc	169	if (MF_DBGLEVEL >= 1) Dbprintf("Authentication failed. Error card response.");\r
20f9a2a1 M	170	return 3;\r
	171	}\r
	172	\r
	173	return 0;\r
	174	}\r
	175	\r
	176	int mifare_classic_readblock(struct Crypto1State pcs, uint32_t uid, uint8_t blockNo, uint8_t blockData) \r
	177	{\r
	178	// variables\r
4abe4f58	179	int len; \r
20f9a2a1 M	180	uint8_t bt[2];\r
20f9a2a1 M	181	\r
4abe4f58	182	uint8_t* receivedAnswer = mifare_get_bigbufptr();\r
20f9a2a1	183	\r
4abe4f58	184	// command MIFARE_CLASSIC_READBLOCK\r
20f9a2a1 M	185	len = mifare_sendcmd_short(pcs, 1, 0x30, blockNo, receivedAnswer);\r
20f9a2a1 M	186	if (len == 1) {\r
f397b5cc	187	if (MF_DBGLEVEL >= 1) Dbprintf("Cmd Error: %02x", receivedAnswer[0]); \r
20f9a2a1 M	188	return 1;\r
	189	}\r
	190	if (len != 18) {\r
f397b5cc	191	if (MF_DBGLEVEL >= 1) Dbprintf("Cmd Error: card timeout. len: %x", len); \r
20f9a2a1 M	192	return 2;\r
	193	}\r
	194	\r
	195	memcpy(bt, receivedAnswer + 16, 2);\r
4abe4f58	196	AppendCrc14443a(receivedAnswer, 16);\r
20f9a2a1	197	if (bt[0] != receivedAnswer[16] \|\| bt[1] != receivedAnswer[17]) {\r
f397b5cc	198	if (MF_DBGLEVEL >= 1) Dbprintf("Cmd CRC response error."); \r
20f9a2a1 M	199	return 3;\r
	200	}\r
	201	\r
	202	memcpy(blockData, receivedAnswer, 16);\r
	203	return 0;\r
	204	}\r
	205	\r
	206	int mifare_classic_writeblock(struct Crypto1State pcs, uint32_t uid, uint8_t blockNo, uint8_t blockData) \r
	207	{\r
	208	// variables\r
4abe4f58	209	int len, i; \r
20f9a2a1	210	uint32_t pos;\r
4abe4f58 M	211	uint32_t par = 0;\r
4abe4f58 M	212	byte_t res;\r
20f9a2a1 M	213	\r
20f9a2a1 M	214	uint8_t d_block[18], d_block_enc[18];\r
4abe4f58	215	uint8_t* receivedAnswer = mifare_get_bigbufptr();\r
20f9a2a1	216	\r
4abe4f58	217	// command MIFARE_CLASSIC_WRITEBLOCK\r
20f9a2a1 M	218	len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer);\r
	219	\r
	220	if ((len != 1) \|\| (receivedAnswer[0] != 0x0A)) { // 0x0a - ACK\r
f397b5cc	221	if (MF_DBGLEVEL >= 1) Dbprintf("Cmd Error: %02x", receivedAnswer[0]); \r
20f9a2a1 M	222	return 1;\r
	223	}\r
	224	\r
	225	memcpy(d_block, blockData, 16);\r
	226	AppendCrc14443a(d_block, 16);\r
	227	\r
	228	// crypto\r
	229	par = 0;\r
4abe4f58 M	230	for (pos = 0; pos < 18; pos++)\r
	231	{\r
	232	d_block_enc[pos] = crypto1_byte(pcs, 0x00, 0) ^ d_block[pos];\r
20f9a2a1	233	par = (par >> 1) \| ( ((filter(pcs->odd) ^ oddparity(d_block[pos])) & 0x01) * 0x20000 );\r
4abe4f58	234	} \r
20f9a2a1	235	\r
4abe4f58	236	ReaderTransmitPar(d_block_enc, sizeof(d_block_enc), par);\r
20f9a2a1	237	\r
4abe4f58	238	// Receive the response\r
20f9a2a1 M	239	len = ReaderReceive(receivedAnswer); \r
	240	\r
	241	res = 0;\r
	242	for (i = 0; i < 4; i++)\r
	243	res \|= (crypto1_bit(pcs, 0, 0) ^ BIT(receivedAnswer[0], i)) << i;\r
	244	\r
	245	if ((len != 1) \|\| (res != 0x0A)) {\r
f397b5cc	246	if (MF_DBGLEVEL >= 1) Dbprintf("Cmd send data2 Error: %02x", res); \r
20f9a2a1 M	247	return 2;\r
	248	}\r
	249	\r
	250	return 0;\r
	251	}\r
	252	\r
	253	int mifare_classic_halt(struct Crypto1State *pcs, uint32_t uid) \r
	254	{\r
	255	// variables\r
4abe4f58	256	int len; \r
20f9a2a1 M	257	\r
20f9a2a1 M	258	// Mifare HALT\r
4abe4f58	259	uint8_t* receivedAnswer = mifare_get_bigbufptr();\r
20f9a2a1 M	260	\r
20f9a2a1 M	261	len = mifare_sendcmd_short(pcs, 1, 0x50, 0x00, receivedAnswer);\r
4abe4f58	262	if (len != 0) {\r
f397b5cc	263	if (MF_DBGLEVEL >= 1) Dbprintf("halt error. response len: %x", len); \r
20f9a2a1 M	264	return 1;\r
	265	}\r
	266	\r
	267	return 0;\r
	268	}\r