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proxmark3/client/src/cmdlfawid.c
iceman1001 80817cea00 hf iclass chk - rework OLD -> NG. And textual
2021-05-03 09:31:51 +02:00

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//-----------------------------------------------------------------------------
// Authored by Craig Young <cyoung@tripwire.com> based on cmdlfhid.c structure
//
// cmdlfhid.c is Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
//
// 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 AWID26/50 commands
// FSK2a, RF/50, 96 bits (complete)
//-----------------------------------------------------------------------------
#include "cmdlfawid.h" // AWID function declarations
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "commonutil.h" // ARRAYLEN
#include "cmdparser.h" // command_t
#include "comms.h"
#include "graph.h"
#include "cmddata.h"
#include "ui.h" // PrintAndLog
#include "lfdemod.h" // parityTest
#include "cmdlf.h" // lf read
#include "protocols.h" // for T55xx config register definitions
#include "util_posix.h"
#include "cmdlft55xx.h" // verifywrite
#include "cliparser.h"
#include "cmdlfem4x05.h" // EM defines
static int CmdHelp(const char *Cmd);
static int sendPing(void) {
SendCommandNG(CMD_BREAK_LOOP, NULL, 0);
SendCommandNG(CMD_PING, NULL, 0);
clearCommandBuffer();
PacketResponseNG resp;
if (!WaitForResponseTimeout(CMD_PING, &resp, 1000))
return PM3_ETIMEOUT;
return PM3_SUCCESS;
}
static int sendTry(uint8_t fmtlen, uint32_t fc, uint32_t cn, uint32_t delay, uint8_t *bits, size_t bs_len, bool verbose) {
if (verbose)
PrintAndLogEx(INFO, "Trying FC: " _YELLOW_("%u") " CN: " _YELLOW_("%u"), fc, cn);
if (getAWIDBits(fmtlen, fc, cn, bits) != PM3_SUCCESS) {
PrintAndLogEx(ERR, "Error with tag bitstream generation.");
return PM3_ESOFT;
}
lf_fsksim_t *payload = calloc(1, sizeof(lf_fsksim_t) + bs_len);
payload->fchigh = 10;
payload->fclow = 8;
payload->separator = 1;
payload->clock = 50;
memcpy(payload->data, bits, bs_len);
clearCommandBuffer();
SendCommandNG(CMD_LF_FSK_SIMULATE, (uint8_t *)payload, sizeof(lf_fsksim_t) + bs_len);
free(payload);
msleep(delay);
return sendPing();
}
static void verify_values(uint8_t *fmtlen, uint32_t *fc, uint32_t *cn) {
switch (*fmtlen) {
case 50:
if ((*fc & 0xFFFF) != *fc) {
*fc &= 0xFFFF;
PrintAndLogEx(INFO, "Facility-Code Truncated to 16-bits (AWID50): %u", *fc);
}
break;
case 37:
if ((*fc & 0x1FFF) != *fc) {
*fc &= 0x1FFF;
PrintAndLogEx(INFO, "Facility-Code Truncated to 13-bits (AWID37): %u", *fc);
}
if ((*cn & 0x3FFFF) != *cn) {
*cn &= 0x3FFFF;
PrintAndLogEx(INFO, "Card Number Truncated to 18-bits (AWID37): %u", *cn);
}
break;
case 34:
if ((*fc & 0xFF) != *fc) {
*fc &= 0xFF;
PrintAndLogEx(INFO, "Facility-Code Truncated to 8-bits (AWID34): %u", *fc);
}
if ((*cn & 0xFFFFFF) != *cn) {
*cn &= 0xFFFFFF;
PrintAndLogEx(INFO, "Card Number Truncated to 24-bits (AWID34): %u", *cn);
}
break;
case 26:
default:
*fmtlen = 26;
if ((*fc & 0xFF) != *fc) {
*fc &= 0xFF;
PrintAndLogEx(INFO, "Facility-Code Truncated to 8-bits (AWID26): %u", *fc);
}
if ((*cn & 0xFFFF) != *cn) {
*cn &= 0xFFFF;
PrintAndLogEx(INFO, "Card Number Truncated to 16-bits (AWID26): %u", *cn);
}
break;
}
}
// this read loops on device side.
// uses the demod in lfops.c
static int CmdAWIDWatch(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf awid watch",
"Enables AWID compatible reader mode printing details of scanned AWID26 or AWID50 tags.\n"
"Run until the button is pressed or another USB command is issued.",
"lf awid watch"
);
void *argtable[] = {
arg_param_begin,
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, true);
CLIParserFree(ctx);
PrintAndLogEx(SUCCESS, "Watching for AWID cards - place tag on antenna");
PrintAndLogEx(INFO, "Press pm3-button to stop reading cards");
clearCommandBuffer();
SendCommandNG(CMD_LF_AWID_WATCH, NULL, 0);
return lfsim_wait_check(CMD_LF_AWID_WATCH);
}
//by marshmellow
//AWID Prox demod - FSK2a RF/50 with preamble of 00000001 (always a 96 bit data stream)
//print full AWID Prox ID and some bit format details if found
int demodAWID(bool verbose) {
(void) verbose; // unused so far
uint8_t *bits = calloc(MAX_GRAPH_TRACE_LEN, sizeof(uint8_t));
if (bits == NULL) {
PrintAndLogEx(DEBUG, "DEBUG: Error - AWID failed to allocate memory");
return PM3_EMALLOC;
}
size_t size = getFromGraphBuf(bits);
if (size == 0) {
PrintAndLogEx(DEBUG, "DEBUG: Error - AWID not enough samples");
free(bits);
return PM3_ENODATA;
}
//get binary from fsk wave
int waveIdx = 0;
int idx = detectAWID(bits, &size, &waveIdx);
if (idx <= 0) {
if (idx == -1)
PrintAndLogEx(DEBUG, "DEBUG: Error - AWID not enough samples");
else if (idx == -2)
PrintAndLogEx(DEBUG, "DEBUG: Error - AWID only noise found");
else if (idx == -3)
PrintAndLogEx(DEBUG, "DEBUG: Error - AWID problem during FSK demod");
else if (idx == -4)
PrintAndLogEx(DEBUG, "DEBUG: Error - AWID preamble not found");
else if (idx == -5)
PrintAndLogEx(DEBUG, "DEBUG: Error - AWID size not correct, size %zu", size);
else
PrintAndLogEx(DEBUG, "DEBUG: Error - AWID error demoding fsk %d", idx);
free(bits);
return PM3_ESOFT;
}
setDemodBuff(bits, size, idx);
setClockGrid(50, waveIdx + (idx * 50));
// Index map
// 0 10 20 30 40 50 60
// | | | | | | |
// 01234567 890 1 234 5 678 9 012 3 456 7 890 1 234 5 678 9 012 3 456 7 890 1 234 5 678 9 012 3 - to 96
// -----------------------------------------------------------------------------
// 00000001 000 1 110 1 101 1 011 1 101 1 010 0 000 1 000 1 010 0 001 0 110 1 100 0 000 1 000 1
// premable bbb o bbb o bbw o fff o fff o ffc o ccc o ccc o ccc o ccc o ccc o wxx o xxx o xxx o - to 96
// |---26 bit---| |-----117----||-------------142-------------|
// b = format bit len, o = odd parity of last 3 bits
// f = facility code, c = card number
// w = wiegand parity
// (26 bit format shown)
//get raw ID before removing parities
uint32_t rawLo = bytebits_to_byte(bits + idx + 64, 32);
uint32_t rawHi = bytebits_to_byte(bits + idx + 32, 32);
uint32_t rawHi2 = bytebits_to_byte(bits + idx, 32);
size = removeParity(bits, idx + 8, 4, 1, 88);
if (size != 66) {
PrintAndLogEx(DEBUG, "DEBUG: Error - AWID at parity check-tag size does not match AWID format");
free(bits);
return PM3_ESOFT;
}
// ok valid card found!
// Index map
// 0 10 20 30 40 50 60
// | | | | | | |
// 01234567 8 90123456 7890123456789012 3 456789012345678901234567890123456
// -----------------------------------------------------------------------------
// 00011010 1 01110101 0000000010001110 1 000000000000000000000000000000000
// bbbbbbbb w ffffffff cccccccccccccccc w xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
// |26 bit| |-117--| |-----142------|
//
// 00110010 0 0000111110100000 00000000000100010010100010000111 1 000000000
// bbbbbbbb w ffffffffffffffff cccccccccccccccccccccccccccccccc w xxxxxxxxx
// |50 bit| |----4000------| |-----------2248975------------|
// b = format bit len, o = odd parity of last 3 bits
// f = facility code, c = card number
// w = wiegand parity
uint32_t fc = 0;
uint32_t cardnum = 0;
uint32_t code1 = 0;
uint32_t code2 = 0;
uint8_t fmtLen = bytebits_to_byte(bits, 8);
switch (fmtLen) {
case 26:
fc = bytebits_to_byte(bits + 9, 8);
cardnum = bytebits_to_byte(bits + 17, 16);
code1 = bytebits_to_byte(bits + 8, fmtLen);
PrintAndLogEx(SUCCESS, "AWID - len: " _GREEN_("%d") " FC: " _GREEN_("%d") " Card: " _GREEN_("%u") " - Wiegand: " _GREEN_("%x") ", Raw: %08x%08x%08x", fmtLen, fc, cardnum, code1, rawHi2, rawHi, rawLo);
break;
case 34:
fc = bytebits_to_byte(bits + 9, 8);
cardnum = bytebits_to_byte(bits + 17, 24);
code1 = bytebits_to_byte(bits + 8, (fmtLen - 32));
code2 = bytebits_to_byte(bits + 8 + (fmtLen - 32), 32);
PrintAndLogEx(SUCCESS, "AWID - len: " _GREEN_("%d") " FC: " _GREEN_("%d") " Card: " _GREEN_("%u") " - Wiegand: " _GREEN_("%x%08x") ", Raw: %08x%08x%08x", fmtLen, fc, cardnum, code1, code2, rawHi2, rawHi, rawLo);
break;
case 37:
fc = bytebits_to_byte(bits + 9, 13);
cardnum = bytebits_to_byte(bits + 22, 18);
code1 = bytebits_to_byte(bits + 8, (fmtLen - 32));
code2 = bytebits_to_byte(bits + 8 + (fmtLen - 32), 32);
PrintAndLogEx(SUCCESS, "AWID - len: " _GREEN_("%d")" FC: " _GREEN_("%d")" Card: " _GREEN_("%u") " - Wiegand: " _GREEN_("%x%08x") ", Raw: %08x%08x%08x", fmtLen, fc, cardnum, code1, code2, rawHi2, rawHi, rawLo);
break;
// case 40:
// break;
case 50:
fc = bytebits_to_byte(bits + 9, 16);
cardnum = bytebits_to_byte(bits + 25, 32);
code1 = bytebits_to_byte(bits + 8, (fmtLen - 32));
code2 = bytebits_to_byte(bits + 8 + (fmtLen - 32), 32);
PrintAndLogEx(SUCCESS, "AWID - len: " _GREEN_("%d") " FC: " _GREEN_("%d") " Card: " _GREEN_("%u") " - Wiegand: " _GREEN_("%x%08x") ", Raw: %08x%08x%08x", fmtLen, fc, cardnum, code1, code2, rawHi2, rawHi, rawLo);
break;
default:
if (fmtLen > 32) {
cardnum = bytebits_to_byte(bits + 8 + (fmtLen - 17), 16);
code1 = bytebits_to_byte(bits + 8, fmtLen - 32);
code2 = bytebits_to_byte(bits + 8 + (fmtLen - 32), 32);
PrintAndLogEx(SUCCESS, "AWID - len: " _GREEN_("%d") " -unknown- (%u) - Wiegand: " _GREEN_("%x%08x") ", Raw: %08x%08x%08x", fmtLen, cardnum, code1, code2, rawHi2, rawHi, rawLo);
} else {
cardnum = bytebits_to_byte(bits + 8 + (fmtLen - 17), 16);
code1 = bytebits_to_byte(bits + 8, fmtLen);
PrintAndLogEx(SUCCESS, "AWID - len: " _GREEN_("%d") " -unknown- (%u) - Wiegand: " _GREEN_("%x") ", Raw: %08x%08x%08x", fmtLen, cardnum, code1, rawHi2, rawHi, rawLo);
}
break;
}
free(bits);
PrintAndLogEx(DEBUG, "DEBUG: AWID idx: %d, Len: %zu Printing Demod Buffer:", idx, size);
if (g_debugMode) {
printDemodBuff(0, false, false, true);
printDemodBuff(0, false, false, false);
}
return PM3_SUCCESS;
}
static int CmdAWIDDemod(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf awid demod",
"Try to find AWID Prox preamble, if found decode / descramble data",
"lf awid demod"
);
void *argtable[] = {
arg_param_begin,
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, true);
CLIParserFree(ctx);
return demodAWID(true);
}
// this read is the "normal" read, which download lf signal and tries to demod here.
static int CmdAWIDReader(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf awid reader",
"read a AWID Prox tag",
"lf awid reader -@ -> continuous reader mode"
);
void *argtable[] = {
arg_param_begin,
arg_lit0("@", NULL, "optional - continuous reader mode"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, true);
bool cm = arg_get_lit(ctx, 1);
CLIParserFree(ctx);
if (cm) {
PrintAndLogEx(INFO, "Press " _GREEN_("<Enter>") " to exit");
}
do {
lf_read(false, 12000);
demodAWID(!cm);
} while (cm && !kbd_enter_pressed());
return PM3_SUCCESS;
}
static int CmdAWIDClone(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf awid clone",
"clone a AWID Prox tag to a T55x7, Q5/T5555 or EM4305/4469 tag",
"lf awid clone --fmt 26 --fc 123 --cn 1337\n"
"lf awid clone --fmt 50 --fc 2001 --cn 13371337\n"
"lf awid clone --q5 --fmt 26 --fc 123 --cn 1337 -> encode for Q5/T5555 tag\n"
"lf awid clone --em --fmt 26 --fc 123 --cn 1337 -> encode for EM4305/4469"
);
void *argtable[] = {
arg_param_begin,
arg_u64_1(NULL, "fmt", "<dec>", "format length 26|34|37|50"),
arg_u64_1(NULL, "fc", "<dec>", "8|16bit value facility code"),
arg_u64_1(NULL, "cn", "<dec>", "16|32-bit value card number"),
arg_lit0(NULL, "q5", "optional - specify writing to Q5/T5555 tag"),
arg_lit0(NULL, "em", "optional - specify writing to EM4305/4469 tag"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, false);
uint8_t fmtlen = arg_get_u32_def(ctx, 1, 0);
uint32_t fc = arg_get_u32_def(ctx, 2, 0);
uint32_t cn = arg_get_u32_def(ctx, 3, 0);
bool q5 = arg_get_lit(ctx, 4);
bool em = arg_get_lit(ctx, 5);
CLIParserFree(ctx);
if (q5 && em) {
PrintAndLogEx(FAILED, "Can't specify both Q5 and EM4305 at the same time");
return PM3_EINVARG;
}
uint32_t blocks[4] = {T55x7_MODULATION_FSK2a | T55x7_BITRATE_RF_50 | 3 << T55x7_MAXBLOCK_SHIFT, 0, 0, 0};
char cardtype[16] = {"T55x7"};
// Q5
if (q5) {
//t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
blocks[0] = T5555_FIXED | T5555_MODULATION_FSK2 | T5555_INVERT_OUTPUT | T5555_SET_BITRATE(50) | 3 << T5555_MAXBLOCK_SHIFT;
snprintf(cardtype, sizeof(cardtype), "Q5/T5555");
}
// EM4305
if (em) {
blocks[0] = EM4305_AWID_CONFIG_BLOCK;
snprintf(cardtype, sizeof(cardtype), "EM4305/4469");
}
verify_values(&fmtlen, &fc, &cn);
uint8_t *bits = calloc(96, sizeof(uint8_t));
if (getAWIDBits(fmtlen, fc, cn, bits) != PM3_SUCCESS) {
PrintAndLogEx(ERR, "Error with tag bitstream generation.");
free(bits);
return PM3_ESOFT;
}
blocks[1] = bytebits_to_byte(bits, 32);
blocks[2] = bytebits_to_byte(bits + 32, 32);
blocks[3] = bytebits_to_byte(bits + 64, 32);
free(bits);
PrintAndLogEx(INFO, "Preparing to clone AWID %u to " _YELLOW_("%s") " with FC: " _GREEN_("%u") " CN: " _GREEN_("%u"), fmtlen, cardtype, fc, cn);
print_blocks(blocks, ARRAYLEN(blocks));
int res;
if (em) {
res = em4x05_clone_tag(blocks, ARRAYLEN(blocks), 0, false);
} else {
res = clone_t55xx_tag(blocks, ARRAYLEN(blocks));
}
PrintAndLogEx(SUCCESS, "Done");
PrintAndLogEx(HINT, "Hint: try " _YELLOW_("`lf awid reader`") " to verify");
return res;
}
static int CmdAWIDSim(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf awid sim",
"Enables simulation of AWID card with specified facility-code and card number.\n"
"Simulation runs until the button is pressed or another USB command is issued.",
"lf awid sim --fmt 26 --fc 123 --cn 1337\n"
"lf awid sim --fmt 50 --fc 2001 --cn 13371337"
);
void *argtable[] = {
arg_param_begin,
arg_u64_1(NULL, "fmt", "<dec>", "format length 26|32|36|40"),
arg_u64_1(NULL, "fc", "<dec>", "8-bit value facility code"),
arg_u64_1(NULL, "cn", "<dec>", "16-bit value card number"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, false);
uint8_t fmtlen = arg_get_u32_def(ctx, 1, 0);
uint32_t fc = arg_get_u32_def(ctx, 2, 0);
uint32_t cn = arg_get_u32_def(ctx, 3, 0);
CLIParserFree(ctx);
uint8_t bs[96];
memset(bs, 0x00, sizeof(bs));
verify_values(&fmtlen, &fc, &cn);
if (getAWIDBits(fmtlen, fc, cn, bs) != PM3_SUCCESS) {
PrintAndLogEx(ERR, "Error with tag bitstream generation.");
return PM3_ESOFT;
}
PrintAndLogEx(SUCCESS, "Simulating "_YELLOW_("AWID %u") " -- FC: " _YELLOW_("%u") " CN: " _YELLOW_("%u"), fmtlen, fc, cn);
// AWID uses: FSK2a fcHigh: 10, fcLow: 8, clk: 50, invert: 1
// arg1 --- fcHigh<<8 + fcLow
// arg2 --- Inversion and clk setting
// 96 --- Bitstream length: 96-bits == 12 bytes
lf_fsksim_t *payload = calloc(1, sizeof(lf_fsksim_t) + sizeof(bs));
payload->fchigh = 10;
payload->fclow = 8;
payload->separator = 1;
payload->clock = 50;
memcpy(payload->data, bs, sizeof(bs));
clearCommandBuffer();
SendCommandNG(CMD_LF_FSK_SIMULATE, (uint8_t *)payload, sizeof(lf_fsksim_t) + sizeof(bs));
free(payload);
return lfsim_wait_check(CMD_LF_FSK_SIMULATE);
}
static int CmdAWIDBrute(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf awid brute",
"Enables bruteforce of AWID reader with specified facility-code.\n"
"This is a attack against reader. if cardnumber is given, it starts with it and goes up / down one step\n"
"if cardnumber is not given, it starts with 1 and goes up to 65535",
"lf awid brute --fmt 26 --fc 224\n"
"lf awid brute --fmt 50 --fc 2001 --delay 2000\n"
"lf awid brute --fmt 50 --fc 2001 --cn 200 --delay 2000 -v"
);
void *argtable[] = {
arg_param_begin,
arg_u64_1(NULL, "fmt", "<dec>", "format length 26|50"),
arg_u64_1(NULL, "fc", "<dec>", "8|16bit value facility code"),
arg_u64_0(NULL, "cn", "<dec>", "optional - card number to start with, max 65535"),
arg_u64_0(NULL, "delay", "<dec>", "optional - delay betweens attempts in ms. Default 1000ms"),
arg_lit0("v", "verbose", "verbose logging, show all tries"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, false);
uint8_t fmtlen = arg_get_u32_def(ctx, 1, 0);
uint32_t fc = arg_get_u32_def(ctx, 2, 0);
uint32_t cn = arg_get_u32_def(ctx, 3, 0);
uint32_t delay = arg_get_u32_def(ctx, 4, 1000);
bool verbose = arg_get_lit(ctx, 5);
CLIParserFree(ctx);
// limit fc according to selected format
switch (fmtlen) {
case 50:
if ((fc & 0xFFFF) != fc) {
fc &= 0xFFFF;
PrintAndLogEx(INFO, "Facility-code truncated to 16-bits (AWID50): %u", fc);
}
break;
default:
if ((fc & 0xFF) != fc) {
fc &= 0xFF;
PrintAndLogEx(INFO, "Facility-code truncated to 8-bits (AWID26): %u", fc);
}
break;
}
// truncate card number
if ((cn & 0xFFFF) != cn) {
cn &= 0xFFFF;
PrintAndLogEx(INFO, "Card number truncated to 16-bits : %u", cn);
}
PrintAndLogEx(SUCCESS, "Bruteforceing AWID %d reader", fmtlen);
PrintAndLogEx(SUCCESS, "Press pm3-button to abort simulation or press Enter");
uint16_t up = cn;
uint16_t down = cn;
uint8_t bits[96];
size_t size = sizeof(bits);
memset(bits, 0x00, size);
// main loop
for (;;) {
if (!session.pm3_present) {
PrintAndLogEx(WARNING, "Device offline\n");
return PM3_ENODATA;
}
if (kbd_enter_pressed()) {
PrintAndLogEx(WARNING, "aborted via keyboard!");
return sendPing();
}
// Do one up
if (up < 0xFFFF) {
if (sendTry(fmtlen, fc, up++, delay, bits, size, verbose) != PM3_SUCCESS) {
return PM3_ESOFT;
}
}
// Do one down (if cardnumber is given)
if (cn > 1) {
if (down > 1) {
if (sendTry(fmtlen, fc, --down, delay, bits, size, verbose) != PM3_SUCCESS) {
return PM3_ESOFT;
}
}
}
}
return PM3_SUCCESS;
}
static command_t CommandTable[] = {
{"help", CmdHelp, AlwaysAvailable, "this help"},
{"demod", CmdAWIDDemod, AlwaysAvailable, "demodulate an AWID FSK tag from the GraphBuffer"},
{"reader", CmdAWIDReader, IfPm3Lf, "attempt to read and extract tag data"},
{"clone", CmdAWIDClone, IfPm3Lf, "clone AWID tag to T55x7 or Q5/T5555"},
{"sim", CmdAWIDSim, IfPm3Lf, "simulate AWID tag"},
{"brute", CmdAWIDBrute, IfPm3Lf, "bruteforce card number against reader"},
{"watch", CmdAWIDWatch, IfPm3Lf, "continuously watch for cards. Reader mode"},
{NULL, NULL, NULL, NULL}
};
static int CmdHelp(const char *Cmd) {
(void)Cmd; // Cmd is not used so far
CmdsHelp(CommandTable);
return PM3_SUCCESS;
}
int CmdLFAWID(const char *Cmd) {
clearCommandBuffer();
return CmdsParse(CommandTable, Cmd);
}
//refactored by marshmellow
int getAWIDBits(uint8_t fmtlen, uint32_t fc, uint32_t cn, uint8_t *bits) {
// the return bits, preamble 0000 0001
bits[7] = 1;
uint8_t pre[66];
memset(pre, 0, sizeof(pre));
// add formatlength
num_to_bytebits(fmtlen, 8, pre);
// add facilitycode, cardnumber and wiegand parity bits
switch (fmtlen) {
case 26: {
uint8_t wiegand[24];
num_to_bytebits(fc, 8, wiegand);
num_to_bytebits(cn, 16, wiegand + 8);
wiegand_add_parity(pre + 8, wiegand, sizeof(wiegand));
break;
}
case 34: {
uint8_t wiegand[32];
num_to_bytebits(fc, 8, wiegand);
num_to_bytebits(cn, 24, wiegand + 8);
wiegand_add_parity(pre + 8, wiegand, sizeof(wiegand));
break;
}
case 37: {
uint8_t wiegand[31];
num_to_bytebits(fc, 13, wiegand);
num_to_bytebits(cn, 18, wiegand + 13);
wiegand_add_parity(pre + 8, wiegand, sizeof(wiegand));
break;
}
case 50: {
uint8_t wiegand[48];
num_to_bytebits(fc, 16, wiegand);
num_to_bytebits(cn, 32, wiegand + 16);
wiegand_add_parity(pre + 8, wiegand, sizeof(wiegand));
break;
}
}
// add AWID 4bit parity
size_t bitLen = addParity(pre, bits + 8, 66, 4, 1);
if (bitLen != 88)
return PM3_ESOFT;
PrintAndLogEx(DEBUG, "awid raw bits:\n %s \n", sprint_bin(bits, bitLen));
return PM3_SUCCESS;
}
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