//-----------------------------------------------------------------------------
//
// 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 00101101000001011 01000110010010000101101010011010110 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')
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);
return 1;
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;
}