[proxmark3-svn] / client / cmdlfnedap.c

//-----------------------------------------------------------------------------
//
// 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.
//-----------------------------------------------------------------------------
// Low frequency NEDAP tag commands
//-----------------------------------------------------------------------------
#include <string.h>
#include <inttypes.h>
#include "cmdlfnedap.h"
static int CmdHelp(const char *Cmd);

int usage_lf_nedap_clone(void){
	PrintAndLog("clone a NEDAP tag to a T55x7 tag.");
	PrintAndLog("");
	PrintAndLog("Usage: lf nedap clone <Card-Number>");
	PrintAndLog("Options :");
	PrintAndLog("  <Card Number>   : 24-bit value card number");
//	PrintAndLog("  Q5              : optional - clone to Q5 (T5555) instead of T55x7 chip");
	PrintAndLog("");
	PrintAndLog("Sample  : lf nedap clone 112233");
	return 0;
}

int usage_lf_nedap_sim(void) {
	PrintAndLog("Enables simulation of NEDAP card with specified card number.");
	PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
	PrintAndLog("");
	PrintAndLog("Usage:  lf nedap sim <Card-Number>");
	PrintAndLog("Options :");
	PrintAndLog("  <Card Number>   : 24-bit value card number");
	PrintAndLog("");
	PrintAndLog("Sample  : lf nedap sim 112233");
	return 0;
}

int GetNedapBits(uint32_t cn, uint8_t *nedapBits) {

	uint8_t pre[128];
	memset(pre, 0x00, sizeof(pre));

	// preamble  1111 1111 10 = 0XF8
	num_to_bytebits(0xF8, 10, pre);

	// fixed tagtype code?  0010 1101 = 0x2D
	num_to_bytebits(0x2D, 8, pre+10);
	
	// 46 encrypted bits - UNKNOWN ALGO
	//    -- 16 bits checksum. Should be 4x4 checksum,  based on UID and 2 constant values.
	//    -- 30 bits undocumented?  
	num_to_bytebits(cn, 46, pre+18);

	//----from this part, the UID in clear text, with a 1bit ZERO as separator between bytes.
	pre[64] = 0;

	// cardnumber
	num_to_bytebits(cn, 24, pre+64);

	pre[73] = 0;
	pre[82] = 0;
	pre[91] = 0;
	pre[100] = 0;
	pre[109] = 0;
	pre[118] = 0;
	
	// add paritybits	(bitsource, dest, sourcelen, paritylen, parityType (odd, even,)
	addParity(pre+64, pre+64, 128, 8, 1);

//1111111110001011010000010110100011001001000010110101001101011001000110011010010000000000100001110001001000000001000101011100111
	return 1;
}

//GetParity( uint8_t *bits, uint8_t type, int length)

//NEDAP demod - ASK/Biphase,  RF/64 with preamble of 1111111110  (always a 128 bit data stream)
//print NEDAP Prox ID, encoding, encrypted ID, 

int CmdLFNedapDemod(const char *Cmd) {
	//raw ask demod no start bit finding just get binary from wave
	uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
	size_t size = getFromGraphBuf(BitStream);
	if (size==0) return 0;

	//get binary from ask wave
	if (!ASKbiphaseDemod("0 64 0 0", FALSE)) {
		if (g_debugMode) PrintAndLog("Error NEDAP: ASKbiphaseDemod failed");
		return 0;
	}
	size = DemodBufferLen;
	int idx = NedapDemod(DemodBuffer, &size);
	if (idx < 0){
		if (g_debugMode){
			if (idx == -5)
				PrintAndLog("DEBUG: Error - not enough samples");
			else if (idx == -1)
				PrintAndLog("DEBUG: Error - only noise found");
			else if (idx == -2)
				PrintAndLog("DEBUG: Error - problem during ASK/Biphase demod");
			else if (idx == -3)
				PrintAndLog("DEBUG: Error - Size not correct: %d", size);
			else if (idx == -4)
				PrintAndLog("DEBUG: Error - NEDAP preamble not found");
			else
				PrintAndLog("DEBUG: Error - idx: %d",idx);
		}
		return 0;
	}

/* Index map                                                     O
 preamble    enc tag type         encrypted uid                  P   d    33    d    90    d    04    d    71    d    40    d    45    d    E7    P
1111111110 0010110100000101101000110010010000101101010011010110 0 1 0 00110011 0 10010000 0 00000100 0 01110001 0 01000000 0 01000101 0 11100111 1
                                                                         uid2       uid1       uid0         I          I          R           R    
	 Tag ID is 049033 
	 I = Identical on all tags
	 R = Random ?
	 UID2, UID1, UID0 == card number

*/
	//get raw ID before removing parities
	uint32_t rawLo = bytebits_to_byte(DemodBuffer+idx+96,32);
	uint32_t rawHi = bytebits_to_byte(DemodBuffer+idx+64,32);
	uint32_t rawHi2 = bytebits_to_byte(DemodBuffer+idx+32,32);
	uint32_t rawHi3 = bytebits_to_byte(DemodBuffer+idx,32);
	setDemodBuf(DemodBuffer,128,idx);

	// here 62 is length.
	uint8_t first63bit_parity = GetParity( DemodBuffer, ODD, 62);
	// Parity bits: 0-62 == 63
	// here 62 is pos in a zero based array
	if ( first63bit_parity != DemodBuffer[62]  ) {
		PrintAndLog("1st half parity check failed:  %d | %d ", DemodBuffer[62], first63bit_parity);
		return 0;
	}

	// uint8_t second63bit_parity = GetParity( DemodBuffer+64, ODD, 63);
	// if ( second63bit_parity != DemodBuffer[127]  ) {
		// PrintAndLog("2st half parity check failed:  %d | %d ", DemodBuffer[127], second63bit_parity);
		// return 0;
	// }

	// ok valid card found!
	uint32_t cardnum = bytebits_to_byte(DemodBuffer+81, 16);
	PrintAndLog("NEDAP ID Found - Card: %d - Raw: %08x%08x%08x%08x", cardnum, rawHi3, rawHi2, rawHi, rawLo);
	
	if (g_debugMode){
		PrintAndLog("DEBUG: idx: %d, Len: %d, Printing Demod Buffer:", idx, 128);
		printDemodBuff();
	}
 	PrintAndLog("BIN: %s", sprint_bin_break( DemodBuffer, 64, 64) );


	return 1;
}
/*
lf t55 wr b 1 d FF8B4168
lf t55 wr b 2 d C90B5359
lf t55 wr b 3 d 19A40087
lf t55 wr b 4 d 120115CF

0) 
lf t55 wr b 1 d FF8B6B20
lf t55 wr b 2 d F19B84A3
lf t55 wr b 3 d 18058007
lf t55 wr b 4 d 1200857C

*/

int CmdLFNedapRead(const char *Cmd) {
	CmdLFRead("s");
	getSamples("30000",false);
	return CmdLFNedapDemod("");
}
/*
int CmdLFNedapClone(const char *Cmd) {

	char cmdp = param_getchar(Cmd, 0);
	if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_nedap_clone();

	uint32_t cardnumber=0, cn = 0;
	uint32_t blocks[5];
	uint8_t i;
	uint8_t bs[128];
	memset(bs, 0x00, sizeof(bs));

	if (sscanf(Cmd, "%u", &cn ) != 1) return usage_lf_nedap_clone();

	cardnumber = (cn & 0x00FFFFFF);
	
	if ( !GetNedapBits(cardnumber, bs)) {
		PrintAndLog("Error with tag bitstream generation.");
		return 1;
	}	

	((ASK/biphase   data rawdemod ab 0 64 1 0
	//NEDAP - compat mode, ASK/Biphase, data rate 64, 4 data blocks
	blocks[0] = T55x7_MODULATION_BIPHASE | T55x7_BITRATE_RF_64 | 4<<T55x7_MAXBLOCK_SHIFT;

	if (param_getchar(Cmd, 3) == 'Q' || param_getchar(Cmd, 3) == 'q')
		//t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
		blocks[0] = T5555_MODULATION_BIPHASE | T5555_INVERT_OUTPUT | 64<<T5555_BITRATE_SHIFT | 4<<T5555_MAXBLOCK_SHIFT;

	blocks[1] = bytebits_to_byte(bs,32);
	blocks[2] = bytebits_to_byte(bs+32,32);
	blocks[3] = bytebits_to_byte(bs+64,32);
	blocks[4] = bytebits_to_byte(bs+96,32);

	PrintAndLog("Preparing to clone NEDAP to T55x7 with card number: %u", cardnumber);
	PrintAndLog("Blk | Data ");
	PrintAndLog("----+------------");
	for ( i = 0; i<5; ++i )
		PrintAndLog(" %02d | %08" PRIx32, i, blocks[i]);

	UsbCommand resp;
	UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};

	for ( i = 0; i<5; ++i ) {
		c.arg[0] = blocks[i];
		c.arg[1] = i;
		clearCommandBuffer();
		SendCommand(&c);
		if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){
			PrintAndLog("Error occurred, device did not respond during write operation.");
			return -1;
		}
	}
    return 0;
}
*/

int CmdLFNedapSim(const char *Cmd) {

	char cmdp = param_getchar(Cmd, 0);
	if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_nedap_sim();

	uint32_t cardnumber = 0, cn = 0;
	
	uint8_t bs[128];
	size_t size = sizeof(bs);
	memset(bs, 0x00, size);
	
	// NEDAP,  Bihase = 2, clock 64, inverted, 
	uint8_t encoding = 2, separator = 0, clk=64, invert=1;
	uint16_t arg1, arg2;
	arg1 = clk << 8 | encoding;
	arg2 = invert << 8 | separator;

	if (sscanf(Cmd, "%u", &cn ) != 2) return usage_lf_nedap_sim();
	cardnumber = (cn & 0x00FFFFFF);
	
	if ( !GetNedapBits(cardnumber, bs)) {
		PrintAndLog("Error with tag bitstream generation.");
		return 1;
	}	

	PrintAndLog("Simulating Nedap - CardNumber: %u", cardnumber );
	
	UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
	memcpy(c.d.asBytes, bs, size);
	clearCommandBuffer();
	SendCommand(&c);
	return 0;
}


int CmdLFNedapChk(const char *Cmd){
    
	uint8_t data[256] = { 0x30, 0x16, 0x00, 0x71, 0x40, 0x21, 0xBE};
	int len = 0;
	param_gethex_ex(Cmd, 0, data, &len);
	
	len = ( len == 0 ) ? 5 : len>>1;
	
	PrintAndLog("Input: [%d] %s", len, sprint_hex(data, len));
	
	//uint8_t last = GetParity(data, EVEN, 62);
	//PrintAndLog("TEST PARITY::  %d | %d ", DemodBuffer[62], last);

    uint8_t cl = 0x1D, ch = 0x1D, carry = 0;
    uint8_t al, bl, temp;
    
	for (int i = 0; i < len; ++i){
		al = data[i];
        for (int j = 8; j > 0; --j) {
			
            bl = al ^ ch;
			//printf("BL %02x | CH %02x \n", al, ch);
			
            carry = (cl & 0x80) ? 1 : 0;
            cl <<= 1;
            
            temp = (ch & 0x80) ? 1 : 0;
            ch = (ch << 1) | carry;
            carry = temp;
            
            carry = (al & 0x80) ? 1 : 0;
            al <<= 1;
            
            carry = (bl & 0x80) ? 1 : 0;
            bl <<= 1;
            
            if (carry) {
                cl ^= 0x21;
                ch ^= 0x10;
            }
        }
    }
	
	PrintAndLog("Nedap checksum: [ 0x21, 0xBE ] %x", ((ch << 8) | cl) );
	return 0;
}


static command_t CommandTable[] = {
    {"help",	CmdHelp,		1, "This help"},
	{"read",	CmdLFNedapRead, 0, "Attempt to read and extract tag data"},
//	{"clone",	CmdLFNedapClone,0, "<Card Number>  clone nedap tag"},
	{"sim",		CmdLFNedapSim,  0, "<Card Number>  simulate nedap tag"},
	{"chk",		CmdLFNedapChk,	1, "Calculate Nedap Checksum <uid bytes>"},
    {NULL, NULL, 0, NULL}
};

int CmdLFNedap(const char *Cmd) {
	clearCommandBuffer();
    CmdsParse(CommandTable, Cmd);
    return 0;
}

int CmdHelp(const char *Cmd) {
    CmdsHelp(CommandTable);
    return 0;
}
Commit	Line	Data
56bbb25a	1	//-----------------------------------------------------------------------------
	2	//
	3	// This code is licensed to you under the terms of the GNU GPL, version 2 or,
	4	// at your option, any later version. See the LICENSE.txt file for the text of
	5	// the license.
	6	//-----------------------------------------------------------------------------
	7	// Low frequency NEDAP tag commands
	8	//-----------------------------------------------------------------------------
	9	#include <string.h>
	10	#include <inttypes.h>
	11	#include "cmdlfnedap.h"
	12	static int CmdHelp(const char *Cmd);
	13
	14	int usage_lf_nedap_clone(void){
	15	PrintAndLog("clone a NEDAP tag to a T55x7 tag.");
	16	PrintAndLog("");
	17	PrintAndLog("Usage: lf nedap clone <Card-Number>");
	18	PrintAndLog("Options :");
	19	PrintAndLog(" <Card Number> : 24-bit value card number");
	20	// PrintAndLog(" Q5 : optional - clone to Q5 (T5555) instead of T55x7 chip");
	21	PrintAndLog("");
	22	PrintAndLog("Sample : lf nedap clone 112233");
	23	return 0;
	24	}
	25
	26	int usage_lf_nedap_sim(void) {
	27	PrintAndLog("Enables simulation of NEDAP card with specified card number.");
	28	PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
	29	PrintAndLog("");
	30	PrintAndLog("Usage: lf nedap sim <Card-Number>");
	31	PrintAndLog("Options :");
	32	PrintAndLog(" <Card Number> : 24-bit value card number");
	33	PrintAndLog("");
	34	PrintAndLog("Sample : lf nedap sim 112233");
	35	return 0;
	36	}
	37
	38	int GetNedapBits(uint32_t cn, uint8_t *nedapBits) {
	39
	40	uint8_t pre[128];
	41	memset(pre, 0x00, sizeof(pre));
	42
	43	// preamble 1111 1111 10 = 0XF8
	44	num_to_bytebits(0xF8, 10, pre);
	45
	46	// fixed tagtype code? 0010 1101 = 0x2D
	47	num_to_bytebits(0x2D, 8, pre+10);
	48
	49	// 46 encrypted bits - UNKNOWN ALGO
	50	// -- 16 bits checksum. Should be 4x4 checksum, based on UID and 2 constant values.
	51	// -- 30 bits undocumented?
	52	num_to_bytebits(cn, 46, pre+18);
	53
	54	//----from this part, the UID in clear text, with a 1bit ZERO as separator between bytes.
	55	pre[64] = 0;
	56
	57	// cardnumber
	58	num_to_bytebits(cn, 24, pre+64);
	59
	60	pre[73] = 0;
	61	pre[82] = 0;
	62	pre[91] = 0;
	63	pre[100] = 0;
	64	pre[109] = 0;
65	pre[118] = 0;
66
67	// add paritybits (bitsource, dest, sourcelen, paritylen, parityType (odd, even,)
68	addParity(pre+64, pre+64, 128, 8, 1);
c71f4da9	69
56bbb25a	70	//1111111110001011010000010110100011001001000010110101001101011001000110011010010000000000100001110001001000000001000101011100111
	71	return 1;
	72	}
	73
c71f4da9	74	//GetParity( uint8_t *bits, uint8_t type, int length)
c71f4da9	75
56bbb25a	76	//NEDAP demod - ASK/Biphase, RF/64 with preamble of 1111111110 (always a 128 bit data stream)
56bbb25a	77	//print NEDAP Prox ID, encoding, encrypted ID,
c71f4da9	78
c71f4da9	79	int CmdLFNedapDemod(const char *Cmd) {
56bbb25a	80	//raw ask demod no start bit finding just get binary from wave
	81	uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
	82	size_t size = getFromGraphBuf(BitStream);
	83	if (size==0) return 0;
	84
96faed21	85	//get binary from ask wave
c71f4da9	86	if (!ASKbiphaseDemod("0 64 0 0", FALSE)) {
96faed21	87	if (g_debugMode) PrintAndLog("Error NEDAP: ASKbiphaseDemod failed");
	88	return 0;
	89	}
d34a0b0c	90	size = DemodBufferLen;
c71f4da9	91	int idx = NedapDemod(DemodBuffer, &size);
56bbb25a	92	if (idx < 0){
	93	if (g_debugMode){
	94	if (idx == -5)
	95	PrintAndLog("DEBUG: Error - not enough samples");
	96	else if (idx == -1)
	97	PrintAndLog("DEBUG: Error - only noise found");
	98	else if (idx == -2)
	99	PrintAndLog("DEBUG: Error - problem during ASK/Biphase demod");
	100	else if (idx == -3)
	101	PrintAndLog("DEBUG: Error - Size not correct: %d", size);
	102	else if (idx == -4)
	103	PrintAndLog("DEBUG: Error - NEDAP preamble not found");
	104	else
	105	PrintAndLog("DEBUG: Error - idx: %d",idx);
	106	}
	107	return 0;
	108	}
	109
532bcd71	110	/* Index map O
532bcd71	111	preamble enc tag type encrypted uid P d 33 d 90 d 04 d 71 d 40 d 45 d E7 P
812513bf	112	1111111110 0010110100000101101000110010010000101101010011010110 0 1 0 00110011 0 10010000 0 00000100 0 01110001 0 01000000 0 01000101 0 11100111 1
532bcd71	113	uid2 uid1 uid0 I I R R
56bbb25a	114	Tag ID is 049033
	115	I = Identical on all tags
	116	R = Random ?
	117	UID2, UID1, UID0 == card number
532bcd71	118
56bbb25a	119	*/
56bbb25a	120	//get raw ID before removing parities
c71f4da9	121	uint32_t rawLo = bytebits_to_byte(DemodBuffer+idx+96,32);
	122	uint32_t rawHi = bytebits_to_byte(DemodBuffer+idx+64,32);
	123	uint32_t rawHi2 = bytebits_to_byte(DemodBuffer+idx+32,32);
	124	uint32_t rawHi3 = bytebits_to_byte(DemodBuffer+idx,32);
	125	setDemodBuf(DemodBuffer,128,idx);
56bbb25a	126
532bcd71	127	// here 62 is length.
	128	uint8_t first63bit_parity = GetParity( DemodBuffer, ODD, 62);
	129	// Parity bits: 0-62 == 63
	130	// here 62 is pos in a zero based array
	131	if ( first63bit_parity != DemodBuffer[62] ) {
	132	PrintAndLog("1st half parity check failed: %d \| %d ", DemodBuffer[62], first63bit_parity);
	133	return 0;
	134	}
	135
	136	// uint8_t second63bit_parity = GetParity( DemodBuffer+64, ODD, 63);
	137	// if ( second63bit_parity != DemodBuffer[127] ) {
	138	// PrintAndLog("2st half parity check failed: %d \| %d ", DemodBuffer[127], second63bit_parity);
	139	// return 0;
	140	// }
	141
56bbb25a	142	// ok valid card found!
c71f4da9	143	uint32_t cardnum = bytebits_to_byte(DemodBuffer+81, 16);
56bbb25a	144	PrintAndLog("NEDAP ID Found - Card: %d - Raw: %08x%08x%08x%08x", cardnum, rawHi3, rawHi2, rawHi, rawLo);
	145
	146	if (g_debugMode){
	147	PrintAndLog("DEBUG: idx: %d, Len: %d, Printing Demod Buffer:", idx, 128);
	148	printDemodBuff();
	149	}
532bcd71	150	PrintAndLog("BIN: %s", sprint_bin_break( DemodBuffer, 64, 64) );
532bcd71	151
c71f4da9	152
56bbb25a	153	return 1;
56bbb25a	154	}
c71f4da9	155	/*
	156	lf t55 wr b 1 d FF8B4168
	157	lf t55 wr b 2 d C90B5359
	158	lf t55 wr b 3 d 19A40087
	159	lf t55 wr b 4 d 120115CF
56bbb25a	160
c71f4da9	161	0)
	162	lf t55 wr b 1 d FF8B6B20
	163	lf t55 wr b 2 d F19B84A3
	164	lf t55 wr b 3 d 18058007
	165	lf t55 wr b 4 d 1200857C
	166
	167	*/
56bbb25a	168
	169	int CmdLFNedapRead(const char *Cmd) {
	170	CmdLFRead("s");
	171	getSamples("30000",false);
c71f4da9	172	return CmdLFNedapDemod("");
56bbb25a	173	}
	174	/*
	175	int CmdLFNedapClone(const char *Cmd) {
	176
	177	char cmdp = param_getchar(Cmd, 0);
	178	if (strlen(Cmd) == 0 \|\| cmdp == 'h' \|\| cmdp == 'H') return usage_lf_nedap_clone();
	179
	180	uint32_t cardnumber=0, cn = 0;
	181	uint32_t blocks[5];
	182	uint8_t i;
	183	uint8_t bs[128];
	184	memset(bs, 0x00, sizeof(bs));
	185
	186	if (sscanf(Cmd, "%u", &cn ) != 1) return usage_lf_nedap_clone();
	187
	188	cardnumber = (cn & 0x00FFFFFF);
	189
	190	if ( !GetNedapBits(cardnumber, bs)) {
	191	PrintAndLog("Error with tag bitstream generation.");
	192	return 1;
	193	}
	194
	195	((ASK/biphase data rawdemod ab 0 64 1 0
	196	//NEDAP - compat mode, ASK/Biphase, data rate 64, 4 data blocks
	197	blocks[0] = T55x7_MODULATION_BIPHASE \| T55x7_BITRATE_RF_64 \| 4<<T55x7_MAXBLOCK_SHIFT;
	198
	199	if (param_getchar(Cmd, 3) == 'Q' \|\| param_getchar(Cmd, 3) == 'q')
890ae3dd	200	//t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
56bbb25a	201	blocks[0] = T5555_MODULATION_BIPHASE \| T5555_INVERT_OUTPUT \| 64<<T5555_BITRATE_SHIFT \| 4<<T5555_MAXBLOCK_SHIFT;
	202
	203	blocks[1] = bytebits_to_byte(bs,32);
	204	blocks[2] = bytebits_to_byte(bs+32,32);
	205	blocks[3] = bytebits_to_byte(bs+64,32);
	206	blocks[4] = bytebits_to_byte(bs+96,32);
	207
	208	PrintAndLog("Preparing to clone NEDAP to T55x7 with card number: %u", cardnumber);
	209	PrintAndLog("Blk \| Data ");
	210	PrintAndLog("----+------------");
	211	for ( i = 0; i<5; ++i )
	212	PrintAndLog(" %02d \| %08" PRIx32, i, blocks[i]);
	213
	214	UsbCommand resp;
	215	UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
	216
	217	for ( i = 0; i<5; ++i ) {
	218	c.arg[0] = blocks[i];
	219	c.arg[1] = i;
	220	clearCommandBuffer();
	221	SendCommand(&c);
	222	if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){
	223	PrintAndLog("Error occurred, device did not respond during write operation.");
	224	return -1;
	225	}
	226	}
	227	return 0;
	228	}
	229	*/
	230
	231	int CmdLFNedapSim(const char *Cmd) {
	232
	233	char cmdp = param_getchar(Cmd, 0);
	234	if (strlen(Cmd) == 0 \|\| cmdp == 'h' \|\| cmdp == 'H') return usage_lf_nedap_sim();
	235
	236	uint32_t cardnumber = 0, cn = 0;
	237
	238	uint8_t bs[128];
	239	size_t size = sizeof(bs);
	240	memset(bs, 0x00, size);
	241
	242	// NEDAP, Bihase = 2, clock 64, inverted,
	243	uint8_t encoding = 2, separator = 0, clk=64, invert=1;
	244	uint16_t arg1, arg2;
	245	arg1 = clk << 8 \| encoding;
	246	arg2 = invert << 8 \| separator;
	247
	248	if (sscanf(Cmd, "%u", &cn ) != 2) return usage_lf_nedap_sim();
	249	cardnumber = (cn & 0x00FFFFFF);
	250
	251	if ( !GetNedapBits(cardnumber, bs)) {
	252	PrintAndLog("Error with tag bitstream generation.");
	253	return 1;
	254	}
	255
	256	PrintAndLog("Simulating Nedap - CardNumber: %u", cardnumber );
	257
	258	UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
	259	memcpy(c.d.asBytes, bs, size);
	260	clearCommandBuffer();
	261	SendCommand(&c);
	262	return 0;
	263	}
	264
812513bf	265
812513bf	266
c71f4da9	267	int CmdLFNedapChk(const char *Cmd){
c71f4da9	268
532bcd71	269	uint8_t data[256] = { 0x30, 0x16, 0x00, 0x71, 0x40, 0x21, 0xBE};
c71f4da9	270	int len = 0;
	271	param_gethex_ex(Cmd, 0, data, &len);
	272
	273	len = ( len == 0 ) ? 5 : len>>1;
	274
	275	PrintAndLog("Input: [%d] %s", len, sprint_hex(data, len));
	276
812513bf	277	//uint8_t last = GetParity(data, EVEN, 62);
812513bf	278	//PrintAndLog("TEST PARITY:: %d \| %d ", DemodBuffer[62], last);
532bcd71	279
c71f4da9	280	uint8_t cl = 0x1D, ch = 0x1D, carry = 0;
	281	uint8_t al, bl, temp;
	282
	283	for (int i = 0; i < len; ++i){
	284	al = data[i];
	285	for (int j = 8; j > 0; --j) {
	286
	287	bl = al ^ ch;
	288	//printf("BL %02x \| CH %02x \n", al, ch);
	289
	290	carry = (cl & 0x80) ? 1 : 0;
	291	cl <<= 1;
	292
	293	temp = (ch & 0x80) ? 1 : 0;
	294	ch = (ch << 1) \| carry;
	295	carry = temp;
	296
	297	carry = (al & 0x80) ? 1 : 0;
	298	al <<= 1;
	299
	300	carry = (bl & 0x80) ? 1 : 0;
	301	bl <<= 1;
	302
	303	if (carry) {
	304	cl ^= 0x21;
	305	ch ^= 0x10;
	306	}
	307	}
	308	}
	309
	310	PrintAndLog("Nedap checksum: [ 0x21, 0xBE ] %x", ((ch << 8) \| cl) );
	311	return 0;
	312	}
	313
	314
56bbb25a	315	static command_t CommandTable[] = {
56bbb25a	316	{"help", CmdHelp, 1, "This help"},
c71f4da9	317	{"read", CmdLFNedapRead, 0, "Attempt to read and extract tag data"},
	318	// {"clone", CmdLFNedapClone,0, "<Card Number> clone nedap tag"},
	319	{"sim", CmdLFNedapSim, 0, "<Card Number> simulate nedap tag"},
	320	{"chk", CmdLFNedapChk, 1, "Calculate Nedap Checksum <uid bytes>"},
56bbb25a	321	{NULL, NULL, 0, NULL}
	322	};
	323
	324	int CmdLFNedap(const char *Cmd) {
	325	clearCommandBuffer();
	326	CmdsParse(CommandTable, Cmd);
	327	return 0;
	328	}
	329
	330	int CmdHelp(const char *Cmd) {
	331	CmdsHelp(CommandTable);
	332	return 0;
	333	}