//-----------------------------------------------------------------------------
//
// 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"
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include "cmdparser.h" // command_t
#include "comms.h"
#include "crc16.h"
#include "cmdlft55xx.h" // verifywrite
#include "ui.h"
#include "cmddata.h"
#include "cmdlf.h"
#include "lfdemod.h"
#define FIXED_71 0x71
#define FIXED_40 0x40
#define UNKNOWN_A 0x00
#define UNKNOWN_B 0x00
static int CmdHelp(const char *Cmd);
static int usage_lf_nedap_gen(void) {
PrintAndLogEx(NORMAL, "generate Nedap bitstream in DemodBuffer");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Usage: lf nedap generate [h] [s <subtype>] c <code> i <id> [l]");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h : This help");
PrintAndLogEx(NORMAL, " s <subtype> : optional, default=5");
PrintAndLogEx(NORMAL, " c <code> : customerCode");
PrintAndLogEx(NORMAL, " i <id> : ID (max 99999)");
PrintAndLogEx(NORMAL, " l : optional - long (128), default to short (64)");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf nedap generate s 1 c 123 i 12345");
return PM3_SUCCESS;
}
static 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] [s <subtype>] c <code> i <id> [l]");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h : This help");
PrintAndLogEx(NORMAL, " s <subtype> : optional, default=5");
PrintAndLogEx(NORMAL, " c <code> : customerCode");
PrintAndLogEx(NORMAL, " i <id> : ID (max 99999)");
PrintAndLogEx(NORMAL, " l : optional - long (128), default to short (64)");
// PrintAndLogEx(NORMAL, " Q5 : optional - clone to Q5 (T5555) instead of T55x7 chip");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf nedap clone s 1 c 123 i 12345");
return PM3_SUCCESS;
}
static int usage_lf_nedap_sim(void) {
PrintAndLogEx(NORMAL, "simulate Nedap card.");
PrintAndLogEx(NORMAL, "Simulation runs until the button is pressed or another USB command is issued.");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Usage: lf nedap sim [h] [s <subtype>] c <code> i <id> [l]");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h : This help");
PrintAndLogEx(NORMAL, " s <subtype> : subtype, default=5");
PrintAndLogEx(NORMAL, " c <code> : customerCode");
PrintAndLogEx(NORMAL, " i <id> : ID (max 99999)");
PrintAndLogEx(NORMAL, " l : long (128), default to short (64)");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
// TODO proper example?
PrintAndLogEx(NORMAL, " lf nedap sim s 1 c 7 i 1337");
return PM3_SUCCESS;
}
const uint8_t translateTable[10] = {8, 2, 1, 12, 4, 5, 10, 13, 0, 9};
const uint8_t invTranslateTable[16] = {8, 2, 1, 0xff, 4, 5, 0xff, 0xff, 0, 9, 6, 0xff, 3, 7, 0xff, 0xff};
const uint8_t preamble[] = {1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0}; // zero inside
static inline uint32_t bitcount(uint32_t a) {
#if defined __GNUC__
return __builtin_popcountl(a);
#else
a = a - ((a >> 1) & 0x55555555);
a = (a & 0x33333333) + ((a >> 2) & 0x33333333);
return (((a + (a >> 4)) & 0x0f0f0f0f) * 0x01010101) >> 24;
#endif
}
static uint8_t isEven_64_63(const uint8_t *data) { // 8
return (bitcount(*(uint32_t *) data) + (bitcount((*(uint32_t *)(data + 4)) & 0xfeffffff))) & 1;
}
//NEDAP demod - ASK/Biphase (or Diphase), RF/64 with preamble of 1111111110 (always a 128 bit data stream)
static int CmdLFNedapDemod(const char *Cmd) {
(void)Cmd; // Cmd is not used so far
uint8_t data[16], buffer[7], r0, r1, r2, r3, r4, r5, idxC1, idxC2, idxC3, idxC4, idxC5, fixed0, fixed1, unk1, unk2, subtype; // 4 bits
size_t size, offset = 0;
uint16_t checksum, customerCode; // 12 bits
uint32_t badgeId; // max 99999
if (ASKbiphaseDemod("0 64 1 0", false) != PM3_SUCCESS) {
if (g_debugMode) PrintAndLogEx(DEBUG, "DEBUG: Error - NEDAP: ASK/Biphase Demod failed");
return PM3_ESOFT;
}
size = DemodBufferLen;
if (!preambleSearch(DemodBuffer, (uint8_t *) preamble, sizeof(preamble), &size, &offset)) {
PrintAndLogEx(DEBUG, "DEBUG: Error - NEDAP: preamble not found");
return PM3_ESOFT;
}
// set plot
setDemodBuff(DemodBuffer, size, offset);
setClockGrid(g_DemodClock, g_DemodStartIdx + (g_DemodClock * offset));
// sanity checks
if ((size != 128) && (size != 64)) {
PrintAndLogEx(DEBUG, "DEBUG: Error - NEDAP: Size not correct: %zu", size);
return PM3_ESOFT;
}
if (bits_to_array(DemodBuffer, size, data) != PM3_SUCCESS) {
PrintAndLogEx(DEBUG, "DEBUG: Error - NEDAP: bits_to_array error\n");
return PM3_ESOFT;
}
int ret = PM3_SUCCESS;
// first part
// parity 1 check
if (isEven_64_63(data) != (data[7] & 0x01)) {
PrintAndLogEx(ERR, "Bad parity (%1u)", data[7] & 0x01);
ret = PM3_ESOFT;
}
// header 1 check
// (1111111110 0 -- zero inside)
if ((data[0] != 0xFF) && ((data[1] & 0xE0) != 0x80)) {
PrintAndLogEx(ERR, "Bad header");
ret = PM3_ESOFT;
}
buffer[0] = (data[0] << 7) | (data[1] >> 1);
buffer[1] = (data[1] << 7) | (data[2] >> 1);
buffer[2] = (data[2] << 7) | (data[3] >> 1);
buffer[3] = ((data[4] & 0x1e) << 3) | ((data[5] & 0x1e) >> 1);
buffer[4] = ((data[6] & 0x1e) << 3) | ((data[7] & 0x1e) >> 1);
// CHECKSUM
init_table(CRC_XMODEM);
checksum = crc16_xmodem(buffer, 5);
buffer[6] = (data[3] << 7) | ((data[4] & 0xe0) >> 1) | ((data[4] & 0x01) << 3) | ((data[5] & 0xe0) >> 5);
buffer[5] = (data[5] << 7) | ((data[6] & 0xe0) >> 1) | ((data[6] & 0x01) << 3) | ((data[7] & 0xe0) >> 5);
bool isValid = (checksum == *(uint16_t *)(buffer + 5));
subtype = (data[1] & 0x1e) >> 1;
customerCode = ((data[1] & 0x01) << 11) | (data[2] << 3) | ((data[3] & 0xe0) >> 5);
if (isValid == false) {
PrintAndLogEx(ERR, "Checksum : %s (calc 0x%04X != 0x%04X)", _RED_("failed"), checksum, *(uint16_t *)(buffer + 5));
ret = PM3_ESOFT;
}
idxC1 = invTranslateTable[(data[3] & 0x1e) >> 1];
idxC2 = invTranslateTable[(data[4] & 0x1e) >> 1];
idxC3 = invTranslateTable[(data[5] & 0x1e) >> 1];
idxC4 = invTranslateTable[(data[6] & 0x1e) >> 1];
idxC5 = invTranslateTable[(data[7] & 0x1e) >> 1];
// validation
if ((idxC1 != 0xFF) && (idxC2 != 0xFF) && (idxC3 != 0xFF) && (idxC4 != 0xFF) && (idxC5 != 0xFF)) {
r1 = idxC1;
r2 = ((10 + idxC2) - (idxC1 + 1)) % 10;
r3 = ((10 + idxC3) - (idxC2 + 1)) % 10;
r4 = ((10 + idxC4) - (idxC3 + 1)) % 10;
r5 = ((10 + idxC5) - (idxC4 + 1)) % 10;
badgeId = r1 * 10000 + r2 * 1000 + r3 * 100 + r4 * 10 + r5;
PrintAndLogEx(SUCCESS, "NEDAP Tag Found: Card ID "_YELLOW_("%05u")" subtype: "_YELLOW_("%1u")" customer code: "_YELLOW_("%03x"), badgeId, subtype, customerCode);
PrintAndLogEx(SUCCESS, "Checksum is %s (0x%04X)", _GREEN_("OK"), checksum);
PrintAndLogEx(SUCCESS, "Raw: %s", sprint_hex(data, size / 8));
} else {
PrintAndLogEx(ERR, "Invalid idx (1:%02x - 2:%02x - 3:%02x - 4:%02x - 5:%02x)", idxC1, idxC2, idxC3, idxC4, idxC5);
ret = PM3_ESOFT;
}
if (size > 64) {
// second part
PrintAndLogEx(DEBUG, "NEDAP Tag, second part found");
if (isEven_64_63(data + 8) != (data[15] & 0x01)) {
PrintAndLogEx(ERR, "Bad parity (%1u)", data[15] & 0x01);
return ret;
}
// validation
if ((data[8] & 0x80)
&& (data[9] & 0x40)
&& (data[10] & 0x20)
&& (data[11] & 0x10)
&& (data[12] & 0x08)
&& (data[13] & 0x04)
&& (data[14] & 0x02)) {
PrintAndLogEx(ERR, "Bad zeros");
return ret;
}
//
r4 = (data[8] >> 3) & 0x0F;
r5 = ((data[8] << 1) & 0x0F) | (data[9] >> 7);
r2 = (data[9] >> 2) & 0x0F;
r3 = ((data[9] << 2) & 0x0F) | (data[10] >> 6);
r0 = ((data[10] >> 1) & 0x0F);
r1 = ((data[10] << 3) & 0x0F) | (data[11] >> 5);
fixed0 = ((data[11] << 4) & 0xF0) | (data[12] >> 4);
fixed1 = ((data[12] << 5) & 0xE0) | (data[13] >> 3);
unk1 = ((data[13] << 6) & 0xC0) | (data[14] >> 2);
unk2 = ((data[14] << 7) & 0xC0) | (data[15] >> 1);
// validation 2
if (!r0 && (r1 < 10) && (r2 < 10) && (r3 < 10) && (r4 < 10) && (r5 < 10)) {
badgeId = r1 * 10000 + r2 * 1000 + r3 * 100 + r4 * 10 + r5;
PrintAndLogEx(SUCCESS, "Second Card Id " _YELLOW_("%05u"), badgeId);
if ((fixed0 == FIXED_71) && (fixed1 == FIXED_40))
PrintAndLogEx(DEBUG, "Fixed part {0 = 0x%02x, 1 = 0x%02x}", fixed0, fixed1);
else
PrintAndLogEx(DEBUG, "Bad fixed: {0 = 0x%02x (%0x02x), 1 = 0x%02x (%0x02x)}", fixed0, FIXED_71, fixed1, FIXED_40);
PrintAndLogEx(DEBUG, "Unknown part {1 = 0x%02x, 2 = 0x%02x}", unk1, unk2);
} else {
PrintAndLogEx(ERR, "Bad digits (0:%1x - 1:%1x - 2:%1x - 3:%1x - 4:%1x - 5:%1x)", r0, r1, r2, r3, r4, r5);
return ret;
}
}
return PM3_SUCCESS;
}
/* 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
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
*/
static int CmdLFNedapRead(const char *Cmd) {
lf_read(false, 16000);
return CmdLFNedapDemod(Cmd);
}
static void NedapGen(uint8_t subType, uint16_t customerCode, uint32_t id, bool isLong, uint8_t *data) { // 8 or 16
uint8_t buffer[7], r1, r2, r3, r4, r5, idxC1, idxC2, idxC3, idxC4, idxC5, i, tmp, carry, id2, id1, id0;
uint16_t checksum;
r1 = (uint8_t)(id / 10000);
r2 = (uint8_t)((id % 10000) / 1000);
r3 = (uint8_t)((id % 1000) / 100);
r4 = (uint8_t)((id % 100) / 10);
r5 = (uint8_t)(id % 10);
// first part
idxC1 = r1;
idxC2 = (idxC1 + 1 + r2) % 10;
idxC3 = (idxC2 + 1 + r3) % 10;
idxC4 = (idxC3 + 1 + r4) % 10;
idxC5 = (idxC4 + 1 + r5) % 10;
buffer[0] = 0xc0 | (subType & 0x0F);
buffer[1] = (customerCode & 0x0FF0) >> 4;
buffer[2] = ((customerCode & 0x000F) << 4) | translateTable[idxC1];
buffer[3] = (translateTable[idxC2] << 4) | translateTable[idxC3];
buffer[4] = (translateTable[idxC4] << 4) | translateTable[idxC5];
// checksum
init_table(CRC_XMODEM);
checksum = crc16_xmodem(buffer, 5);
buffer[6] = ((checksum & 0x000F) << 4) | (buffer[4] & 0x0F);
buffer[5] = (checksum & 0x00F0) | ((buffer[4] & 0xF0) >> 4);
buffer[4] = ((checksum & 0x0F00) >> 4) | (buffer[3] & 0x0F);
buffer[3] = ((checksum & 0xF000) >> 8) | ((buffer[3] & 0xF0) >> 4);
// carry calc
for (i = 0, carry = 0; i < sizeof(buffer); i++) {
tmp = buffer[sizeof(buffer) - 1 - i];
data[7 - i] = ((tmp & 0x7F) << 1) | carry;
carry = (tmp & 0x80) >> 7;
}
data[0] = 0xFE | carry;
data[7] |= isEven_64_63(data);
// second part
if (isLong) {
id0 = r1;
id1 = (r2 << 4) | r3;
id2 = (r4 << 4) | r5;
data[8] = (id2 >> 1);
data[9] = ((id2 & 0x01) << 7) | (id1 >> 2);
data[10] = ((id1 & 0x03) << 6) | (id0 >> 3);
data[11] = ((id0 & 0x07) << 5) | (FIXED_71 >> 4);
data[12] = ((FIXED_71 & 0x0F) << 4) | (FIXED_40 >> 5);
data[13] = ((FIXED_40 & 0x1F) << 3) | (UNKNOWN_A >> 6);
data[14] = ((UNKNOWN_A & 0x3F) << 2) | (UNKNOWN_B >> 7);
data[15] = ((UNKNOWN_B & 0x7F) << 1);
data[15] |= isEven_64_63(data + 8);
}
}
static int (*usage_to_be_displayed)(void) = NULL;
static int CmdLfNedapGen(const char *Cmd) {
uint8_t cmdp = 0, subType = 5, data[16], i, bin[128];
uint16_t customerCode = 0;
uint32_t id = 0;
bool isLong = false, errors = false;
int (*usage)(void) = usage_lf_nedap_gen;
if (usage_to_be_displayed != NULL) {
usage = usage_to_be_displayed;
usage_to_be_displayed = NULL;
}
while (param_getchar(Cmd, cmdp) != 0x00 && !errors) {
switch (tolower(param_getchar(Cmd, cmdp))) {
case 's':
subType = param_get8ex(Cmd, cmdp + 1, 5, 10);
cmdp += 2;
break;
case 'c':
customerCode = param_get32ex(Cmd, cmdp + 1, 0, 16);
cmdp += 2;
break;
case 'i':
id = param_get32ex(Cmd, cmdp + 1, 0, 10);
cmdp += 2;
break;
case 'l':
isLong = true;
cmdp++;
break;
default:
PrintAndLogEx(WARNING, "Unknown parameter '%c'", param_getchar(Cmd, cmdp));
errors = true;
break;
}
}
//Validations
if ((!customerCode) || (!id) || (subType > 0xF) || (customerCode > 0xFFF) || (id > 99999))
errors = true;
if (errors || cmdp == 0) {
usage();
return PM3_EINVARG;
}
PrintAndLogEx(SUCCESS,
"Tag - subtype: %1u , customer code: %03x , ID: %05u | %s"
, subType
, customerCode
, id
, isLong ? "(128b)" : "(64b)"
);
NedapGen(subType, customerCode, id, isLong, data);
for (i = 0; i < (isLong ? 16 : 8); i++)
num_to_bytebits(data[i], 8, bin + i * 8);
setDemodBuff(bin, (isLong ? 128 : 64), 0);
return PM3_SUCCESS;
}
static int CmdLFNedapClone(const char *Cmd) {
uint8_t max;
uint32_t blocks[5] = {0};
char cmdp = tolower(param_getchar(Cmd, 0));
if (strlen(Cmd) == 0 || cmdp == 'h') return usage_lf_nedap_clone();
usage_to_be_displayed = usage_lf_nedap_clone;
int ret = CmdLfNedapGen(Cmd);
if (ret != PM3_SUCCESS)
return ret;
if ((DemodBufferLen != 128) && (DemodBufferLen != 64)) {
PrintAndLogEx(ERR, "Error with tag bitstream generation.");
return PM3_ESOFT;
}
//CmdPrintDemodBuff("x");
// What we had before in commented code:
//NEDAP - compat mode, ASK/DIphase, data rate 64, 4 data blocks
// DI-phase (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;
if (DemodBufferLen == 64) {
max = 3;
blocks[0] = T55X7_NEDAP_64_CONFIG_BLOCK;
} else {
max = 5;
blocks[0] = T55X7_NEDAP_128_CONFIG_BLOCK;
}
for (uint8_t i = 1; i < max ; i++) {
blocks[i] = bytebits_to_byte(DemodBuffer + ((i - 1) * 32), 32);
}
PrintAndLogEx(SUCCESS, "Preparing to clone NEDAP to T55x7");
print_blocks(blocks, max);
int res = clone_t55xx_tag(blocks, max);
if (res == PM3_SUCCESS) {
PrintAndLogEx(INFO, "The block 0 was changed (eXtended) which can be hard to detect.");
PrintAndLogEx(INFO, " Configure it manually " _YELLOW_("`lf t55xx config b 64 d BI i 1 o 32`"));
} else {
PrintAndLogEx(NORMAL, "");
}
PrintAndLogEx(SUCCESS, "Done");
PrintAndLogEx(INFO, "Hint: try " _YELLOW_("`lf nedap read`") "to verify");
return res;
}
static int CmdLFNedapSim(const char *Cmd) {
char cmdp = tolower(param_getchar(Cmd, 0));
if (strlen(Cmd) == 0 || cmdp == 'h') return usage_lf_nedap_sim();
usage_to_be_displayed = usage_lf_nedap_sim;
int ret = CmdLfNedapGen(Cmd);
if (ret != PM3_SUCCESS)
return ret;
if ((DemodBufferLen != 128) && (DemodBufferLen != 64)) {
PrintAndLogEx(ERR, "Error with tag bitstream generation.");
return PM3_ESOFT;
}
PrintAndLogEx(SUCCESS, "Simulating NEDAP - Raw");
CmdPrintDemodBuff("x");
// NEDAP, Biphase = 2, clock 64, inverted, (DIPhase == inverted BIphase)
lf_asksim_t *payload = calloc(1, sizeof(lf_asksim_t) + DemodBufferLen);
payload->encoding = 2;
payload->invert = 1;
payload->separator = 0;
payload->clock = 64;
memcpy(payload->data, DemodBuffer, DemodBufferLen);
clearCommandBuffer();
SendCommandNG(CMD_LF_ASK_SIMULATE, (uint8_t *)payload, sizeof(lf_asksim_t) + DemodBufferLen);
free(payload);
PacketResponseNG resp;
WaitForResponse(CMD_LF_ASK_SIMULATE, &resp);
PrintAndLogEx(INFO, "Done");
if (resp.status != PM3_EOPABORTED)
return resp.status;
return PM3_SUCCESS;
}
static command_t CommandTable[] = {
{"help", CmdHelp, AlwaysAvailable, "This help"},
{"demod", CmdLFNedapDemod, AlwaysAvailable, "Demodulate Nedap tag from the GraphBuffer"},
{"generate", CmdLfNedapGen, AlwaysAvailable, "Generate Nedap bitstream in DemodBuffer"},
{"read", CmdLFNedapRead, IfPm3Lf, "Attempt to read and extract tag data from the antenna"},
{"clone", CmdLFNedapClone, IfPm3Lf, "Clone Nedap tag to T55x7"},
{"sim", CmdLFNedapSim, IfPm3Lf, "Simulate Nedap tag"},
{NULL, NULL, NULL, NULL}
};
static int CmdHelp(const char *Cmd) {
(void)Cmd; // Cmd is not used so far
CmdsHelp(CommandTable);
return PM3_SUCCESS;
}
int CmdLFNedap(const char *Cmd) {
clearCommandBuffer();
return CmdsParse(CommandTable, Cmd);
}
int demodNedap(void) {
return CmdLFNedapDemod("");
}