//-----------------------------------------------------------------------------
//
// 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 "cmdlfnedap.h"
static int CmdHelp(const char *Cmd);
int usage_lf_nedap_clone(void){
PrintAndLogEx(NORMAL, "clone a NEDAP tag to a T55x7 tag.");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Usage: lf nedap clone [h] <Card-Number>");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h : This help");
PrintAndLogEx(NORMAL, " <Card Number> : 24-bit value card number");
// PrintAndLogEx(NORMAL, " Q5 : optional - clone to Q5 (T5555) instead of T55x7 chip");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf nedap clone 112233");
return 0;
}
int usage_lf_nedap_sim(void) {
PrintAndLogEx(NORMAL, "Enables simulation of NEDAP card with specified card number.");
PrintAndLogEx(NORMAL, "Simulation runs until the button is pressed or another USB command is issued.");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Usage: lf nedap sim [h] <Card-Number>");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h : This help");
PrintAndLogEx(NORMAL, " <Card Number> : 24-bit value card number");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf nedap sim 112233");
return 0;
}
// find nedap preamble in already demoded data
int detectNedap(uint8_t *dest, size_t *size) {
//make sure buffer has data
if (*size < 128) return -3;
size_t startIdx = 0;
//uint8_t preamble[] = {1,1,1,1,1,1,1,1,1,0,0,0,1};
uint8_t preamble[] = {1,1,1,1,1,1,1,1,1,0};
if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
return -4; //preamble not found
return (int) startIdx;
}
int GetNedapBits(uint32_t cn, uint8_t *nedapBits) {
uint8_t pre[128];
memset(pre, 0x00, sizeof(pre));
// preamble 1111 1111 10 = 0xFF8
num_to_bytebits(0xFF8, 12, 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;
pre[73] = 0;
pre[82] = 0;
pre[91] = 0;
pre[100] = 0;
pre[109] = 0;
pre[118] = 0;
// cardnumber (uid)
num_to_bytebits( (cn >> 0) & 0xFF, 8, pre+65);
num_to_bytebits( (cn >> 8) & 0xFF, 8, pre+74);
num_to_bytebits( (cn >> 16) & 0xFF, 8, pre+83);
// two ?
num_to_bytebits( 0, 8, pre+92);
num_to_bytebits( 0, 8, pre+101);
// chksum
num_to_bytebits( (0 >> 0) & 0xFF, 8, pre+110);
num_to_bytebits( (0 >> 8) & 0xFF, 8, pre+119);
// add paritybits (bitsource, dest, sourcelen, paritylen, parityType (odd, even,)
addParity(pre, pre+64, 64, 8, 1);
addParity(pre+64, pre+64, 64, 8, 1);
pre[63] = GetParity( DemodBuffer, EVEN, 63);
pre[127] = GetParity( DemodBuffer+64, EVEN, 63);
memcpy(nedapBits, pre, 128);
// 1111111110001011010000010110100011001001000010110101001101011001000110011010010000000000100001110001001000000001000101011100111
return 1;
}
/*
- UID: 001630
- i: 4071
- Checksum2 BE21
*/
//GetParity( uint8_t *bits, uint8_t type, int length)
//NEDAP demod - ASK/Biphase (or Diphase), 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
if (!ASKbiphaseDemod("0 64 1 0", false)) {
if (g_debugMode) PrintAndLogEx(DEBUG, "DEBUG: Error - Nedap ASKbiphaseDemod failed");
return 0;
}
size_t size = DemodBufferLen;
int idx = detectNedap(DemodBuffer, &size);
if (idx < 0){
if (g_debugMode){
// if (idx == -5)
// PrintAndLogEx(DEBUG, "DEBUG: Error - not enough samples");
// else if (idx == -1)
// PrintAndLogEx(DEBUG, "DEBUG: Error - only noise found");
// else if (idx == -2)
// PrintAndLogEx(DEBUG, "DEBUG: Error - problem during ASK/Biphase demod");
if (idx == -3)
PrintAndLogEx(DEBUG, "DEBUG: Error - Nedap Size not correct: %d", size);
else if (idx == -4)
PrintAndLogEx(DEBUG, "DEBUG: Error - Nedap preamble not found");
else
PrintAndLogEx(DEBUG, "DEBUG: Error - Nedap idx: %d",idx);
}
return 0;
}
/* Index map E E
preamble enc tag type encrypted uid P d 33 d 90 d 04 d 71 d 40 d 45 d E7 P
1111111110 00101101000001011010001100100100001011010100110101100 1 0 00110011 0 10010000 0 00000100 0 01110001 0 01000000 0 01000101 0 11100111 1
uid2 uid1 uid0 I I R R
1111111110 00101101000001011010001100100100001011010100110101100 1
0 00110011
0 10010000
0 00000100
0 01110001
0 01000000
0 01000101
0 11100111
1
Tag ID is 049033
I = Identical on all tags
R = Random ?
UID2, UID1, UID0 == card number
*/
//get raw ID before removing parities
uint32_t raw[4] = {0,0,0,0};
raw[0] = bytebits_to_byte(DemodBuffer+idx+96,32);
raw[1] = bytebits_to_byte(DemodBuffer+idx+64,32);
raw[2] = bytebits_to_byte(DemodBuffer+idx+32,32);
raw[3] = bytebits_to_byte(DemodBuffer+idx,32);
setDemodBuf(DemodBuffer, 128, idx);
setClockGrid(g_DemodClock, g_DemodStartIdx + (idx*g_DemodClock));
uint8_t firstParity = GetParity( DemodBuffer, EVEN, 63);
if ( firstParity != DemodBuffer[63] ) {
PrintAndLogEx(DEBUG, "DEBUG: Error - Nedap 1st 64bit parity check failed: %d|%d ", DemodBuffer[63], firstParity);
return 0;
}
uint8_t secondParity = GetParity( DemodBuffer+64, EVEN, 63);
if ( secondParity != DemodBuffer[127] ) {
PrintAndLogEx(DEBUG, "DEBUG: Error - Nedap 2st 64bit parity check failed: %d|%d ", DemodBuffer[127], secondParity);
return 0;
}
// ok valid card found!
uint32_t uid = 0;
uid = bytebits_to_byte(DemodBuffer+65, 8);
uid |= bytebits_to_byte(DemodBuffer+74, 8) << 8;
uid |= bytebits_to_byte(DemodBuffer+83, 8) << 16;
uint16_t two = 0;
two = bytebits_to_byte(DemodBuffer+92, 8);
two |= bytebits_to_byte(DemodBuffer+101, 8) << 8;
uint16_t chksum2 = 0;
chksum2 = bytebits_to_byte(DemodBuffer+110, 8);
chksum2 |= bytebits_to_byte(DemodBuffer+119, 8) << 8;
PrintAndLogEx(SUCCESS, "NEDAP ID Found - Raw: %08x%08x%08x%08x", raw[3], raw[2], raw[1], raw[0]);
PrintAndLogEx(SUCCESS, " - UID: %06X", uid);
PrintAndLogEx(SUCCESS, " - i: %04X", two);
PrintAndLogEx(SUCCESS, " - Checksum2 %04X", chksum2);
if (g_debugMode){
PrintAndLogEx(DEBUG, "DEBUG: idx: %d, Len: %d, Printing Demod Buffer:", idx, 128);
printDemodBuff();
PrintAndLogEx(DEBUG, "BIN:\n%s", sprint_bin_break( DemodBuffer, 128, 64) );
}
return 1;
}
/*
configuration
lf t55xx wr b 0 d 00170082
1) uid 049033
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
2) uid 001630
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
3) uid 39feff
lf t55xx wr b 1 d ffbfa73e
lf t55xx wr b 2 d 4c0003ff
lf t55xx wr b 3 d ffbfa73e
lf t55xx wr b 4 d 4c0003ff
*/
int CmdLFNedapRead(const char *Cmd) {
lf_read(true, 12000);
return CmdLFNedapDemod(Cmd);
}
/*
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 bits[128];
memset(bits, 0x00, sizeof(bits));
if (sscanf(Cmd, "%u", &cn ) != 1) return usage_lf_nedap_clone();
cardnumber = (cn & 0x00FFFFFF);
if ( !GetNedapBits(cardnumber, bits)) {
PrintAndLogEx(WARNING, "Error with tag bitstream generation.");
return 1;
}
((ASK/DIphase data rawdemod ab 0 64 1 0
//NEDAP - compat mode, ASK/DIphase, data rate 64, 4 data blocks
// DI-pahse (CDP) T55x7_MODULATION_DIPHASE
blocks[0] = T55x7_MODULATION_DIPHASE | T55x7_BITRATE_RF_64 | 7 << T55x7_MAXBLOCK_SHIFT;
if (param_getchar(Cmd, 3) == 'Q' || param_getchar(Cmd, 3) == 'q')
blocks[0] = T5555_MODULATION_BIPHASE | T5555_INVERT_OUTPUT | T5555_SET_BITRATE(64) | 7 <<T5555_MAXBLOCK_SHIFT;
blocks[1] = bytebits_to_byte(bits, 32);
blocks[2] = bytebits_to_byte(bits + 32, 32);
blocks[3] = bytebits_to_byte(bits + 64, 32);
blocks[4] = bytebits_to_byte(bits + 96, 32);
PrintAndLogEx(INFO, "Preparing to clone NEDAP to T55x7 with card number: %u", cardnumber);
print_blocks(blocks, 5);
UsbCommand resp;
UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
for (uint8_t i = 0; i<5; ++i ) {
c.arg[0] = blocks[i];
c.arg[1] = i;
clearCommandBuffer();
SendCommand(&c);
if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)){
PrintAndLogEx(WARNING, "Error occurred, device did not respond during write operation.");
return -1;
}
}
return 0;
}
*/
int CmdLFNedapSim(const char *Cmd) {
uint32_t cardnumber = 0, cn = 0;
char cmdp = param_getchar(Cmd, 0);
if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_nedap_sim();
if (sscanf(Cmd, "%u", &cn ) != 1) return usage_lf_nedap_sim();
cardnumber = (cn & 0x00FFFFFF);
uint8_t bs[128];
size_t size = sizeof(bs);
memset(bs, 0x00, size);
// NEDAP, Biphase = 2, clock 64, inverted, (DIPhase == inverted BIphase
uint8_t clk = 64, encoding = 2, separator = 0, invert = 1;
uint16_t arg1, arg2;
arg1 = clk << 8 | encoding;
arg2 = invert << 8 | separator;
if ( !GetNedapBits(cardnumber, bs)) {
PrintAndLogEx(WARNING, "Error with tag bitstream generation.");
return 1;
}
PrintAndLogEx(SUCCESS, "bin %s", sprint_bin_break(bs, 128, 32));
PrintAndLogEx(SUCCESS, "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){
//301600714021BE
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;
PrintAndLogEx(SUCCESS, "Input: [%d] %s", len, sprint_hex(data, len));
//uint8_t last = GetParity(data, EVEN, 62);
//PrintAndLogEx(NORMAL, "TEST PARITY:: %d | %d ", DemodBuffer[62], last);
uint8_t cl = 0x1D, ch = 0x1D, carry = 0;
uint8_t al, bl, temp;
for (int i =len; i >= 0; --i){
al = data[i];
for (int j = 8; j > 0; --j) {
bl = al ^ ch;
//PrintAndLogEx(NORMAL, "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;
}
}
}
PrintAndLogEx(SUCCESS, "Nedap checksum: 0x%X", ((ch << 8) | cl) );
return 0;
}
static command_t CommandTable[] = {
{"help", CmdHelp, 1, "this help"},
{"demod", CmdLFNedapDemod,0, "demodulate an Nedap tag from the GraphBuffer"},
{"read", CmdLFNedapRead, 0, "attempt to read and extract tag data"},
// {"clone", CmdLFNedapClone,0, "<Card Number> clone nedap tag"},
{"sim", CmdLFNedapSim, 0, "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;
}