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proxmark3/client/src/cmdlfgallagher.c
iceman1001 d7c5f0cac2 text
2021-04-24 14:39:27 +02:00

484 lines
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//-----------------------------------------------------------------------------
// Iceman, 2019
//
// 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 GALLAGHER tag commands
// ASK/MAN, RF/32, 96 bits long (unknown cs) (0x00088060)
// sample Q5 , ASK RF/32, STT, 96 bits (3blocks) ( 0x9000F006)
//-----------------------------------------------------------------------------
#include "cmdlfgallagher.h"
#include <string.h> // memcpy
#include <ctype.h> // tolower
#include <stdio.h>
#include "commonutil.h" // ARRAYLEN
#include "common.h"
#include "cmdparser.h" // command_t
#include "comms.h"
#include "ui.h"
#include "cmddata.h"
#include "cmdlf.h"
#include "lfdemod.h" // preamble test
#include "protocols.h" // t55xx defines
#include "cmdlft55xx.h" // clone..
#include "crc.h" // CRC8/Cardx
#include "cmdlfem4x05.h" //
#include "cliparser.h"
static int CmdHelp(const char *Cmd);
static void scramble(uint8_t *arr, uint8_t len) {
uint8_t lut[] = {
0xa3, 0xb0, 0x80, 0xc6, 0xb2, 0xf4, 0x5c, 0x6c, 0x81, 0xf1, 0xbb, 0xeb, 0x55, 0x67, 0x3c, 0x05,
0x1a, 0x0e, 0x61, 0xf6, 0x22, 0xce, 0xaa, 0x8f, 0xbd, 0x3b, 0x1f, 0x5e, 0x44, 0x04, 0x51, 0x2e,
0x4d, 0x9a, 0x84, 0xea, 0xf8, 0x66, 0x74, 0x29, 0x7f, 0x70, 0xd8, 0x31, 0x7a, 0x6d, 0xa4, 0x00,
0x82, 0xb9, 0x5f, 0xb4, 0x16, 0xab, 0xff, 0xc2, 0x39, 0xdc, 0x19, 0x65, 0x57, 0x7c, 0x20, 0xfa,
0x5a, 0x49, 0x13, 0xd0, 0xfb, 0xa8, 0x91, 0x73, 0xb1, 0x33, 0x18, 0xbe, 0x21, 0x72, 0x48, 0xb6,
0xdb, 0xa0, 0x5d, 0xcc, 0xe6, 0x17, 0x27, 0xe5, 0xd4, 0x53, 0x42, 0xf3, 0xdd, 0x7b, 0x24, 0xac,
0x2b, 0x58, 0x1e, 0xa7, 0xe7, 0x86, 0x40, 0xd3, 0x98, 0x97, 0x71, 0xcb, 0x3a, 0x0f, 0x01, 0x9b,
0x6e, 0x1b, 0xfc, 0x34, 0xa6, 0xda, 0x07, 0x0c, 0xae, 0x37, 0xca, 0x54, 0xfd, 0x26, 0xfe, 0x0a,
0x45, 0xa2, 0x2a, 0xc4, 0x12, 0x0d, 0xf5, 0x4f, 0x69, 0xe0, 0x8a, 0x77, 0x60, 0x3f, 0x99, 0x95,
0xd2, 0x38, 0x36, 0x62, 0xb7, 0x32, 0x7e, 0x79, 0xc0, 0x46, 0x93, 0x2f, 0xa5, 0xba, 0x5b, 0xaf,
0x52, 0x1d, 0xc3, 0x75, 0xcf, 0xd6, 0x4c, 0x83, 0xe8, 0x3d, 0x30, 0x4e, 0xbc, 0x08, 0x2d, 0x09,
0x06, 0xd9, 0x25, 0x9e, 0x89, 0xf2, 0x96, 0x88, 0xc1, 0x8c, 0x94, 0x0b, 0x28, 0xf0, 0x47, 0x63,
0xd5, 0xb3, 0x68, 0x56, 0x9c, 0xf9, 0x6f, 0x41, 0x50, 0x85, 0x8b, 0x9d, 0x59, 0xbf, 0x9f, 0xe2,
0x8e, 0x6a, 0x11, 0x23, 0xa1, 0xcd, 0xb5, 0x7d, 0xc7, 0xa9, 0xc8, 0xef, 0xdf, 0x02, 0xb8, 0x03,
0x6b, 0x35, 0x3e, 0x2c, 0x76, 0xc9, 0xde, 0x1c, 0x4b, 0xd1, 0xed, 0x14, 0xc5, 0xad, 0xe9, 0x64,
0x4a, 0xec, 0x8d, 0xf7, 0x10, 0x43, 0x78, 0x15, 0x87, 0xe4, 0xd7, 0x92, 0xe1, 0xee, 0xe3, 0x90
};
for (int i = 0; i < len; i++) {
arr[i] = lut[arr[i]];
}
}
static void descramble(uint8_t *arr, uint8_t len) {
uint8_t lut[] = {
0x2f, 0x6e, 0xdd, 0xdf, 0x1d, 0x0f, 0xb0, 0x76, 0xad, 0xaf, 0x7f, 0xbb, 0x77, 0x85, 0x11, 0x6d,
0xf4, 0xd2, 0x84, 0x42, 0xeb, 0xf7, 0x34, 0x55, 0x4a, 0x3a, 0x10, 0x71, 0xe7, 0xa1, 0x62, 0x1a,
0x3e, 0x4c, 0x14, 0xd3, 0x5e, 0xb2, 0x7d, 0x56, 0xbc, 0x27, 0x82, 0x60, 0xe3, 0xae, 0x1f, 0x9b,
0xaa, 0x2b, 0x95, 0x49, 0x73, 0xe1, 0x92, 0x79, 0x91, 0x38, 0x6c, 0x19, 0x0e, 0xa9, 0xe2, 0x8d,
0x66, 0xc7, 0x5a, 0xf5, 0x1c, 0x80, 0x99, 0xbe, 0x4e, 0x41, 0xf0, 0xe8, 0xa6, 0x20, 0xab, 0x87,
0xc8, 0x1e, 0xa0, 0x59, 0x7b, 0x0c, 0xc3, 0x3c, 0x61, 0xcc, 0x40, 0x9e, 0x06, 0x52, 0x1b, 0x32,
0x8c, 0x12, 0x93, 0xbf, 0xef, 0x3b, 0x25, 0x0d, 0xc2, 0x88, 0xd1, 0xe0, 0x07, 0x2d, 0x70, 0xc6,
0x29, 0x6a, 0x4d, 0x47, 0x26, 0xa3, 0xe4, 0x8b, 0xf6, 0x97, 0x2c, 0x5d, 0x3d, 0xd7, 0x96, 0x28,
0x02, 0x08, 0x30, 0xa7, 0x22, 0xc9, 0x65, 0xf8, 0xb7, 0xb4, 0x8a, 0xca, 0xb9, 0xf2, 0xd0, 0x17,
0xff, 0x46, 0xfb, 0x9a, 0xba, 0x8f, 0xb6, 0x69, 0x68, 0x8e, 0x21, 0x6f, 0xc4, 0xcb, 0xb3, 0xce,
0x51, 0xd4, 0x81, 0x00, 0x2e, 0x9c, 0x74, 0x63, 0x45, 0xd9, 0x16, 0x35, 0x5f, 0xed, 0x78, 0x9f,
0x01, 0x48, 0x04, 0xc1, 0x33, 0xd6, 0x4f, 0x94, 0xde, 0x31, 0x9d, 0x0a, 0xac, 0x18, 0x4b, 0xcd,
0x98, 0xb8, 0x37, 0xa2, 0x83, 0xec, 0x03, 0xd8, 0xda, 0xe5, 0x7a, 0x6b, 0x53, 0xd5, 0x15, 0xa4,
0x43, 0xe9, 0x90, 0x67, 0x58, 0xc0, 0xa5, 0xfa, 0x2a, 0xb1, 0x75, 0x50, 0x39, 0x5c, 0xe6, 0xdc,
0x89, 0xfc, 0xcf, 0xfe, 0xf9, 0x57, 0x54, 0x64, 0xa8, 0xee, 0x23, 0x0b, 0xf1, 0xea, 0xfd, 0xdb,
0xbd, 0x09, 0xb5, 0x5b, 0x05, 0x86, 0x13, 0xf3, 0x24, 0xc5, 0x3f, 0x44, 0x72, 0x7c, 0x7e, 0x36
};
for (int i = 0; i < len; i++) {
arr[i] = lut[arr[i]];
}
}
//see ASK/MAN Demod for what args are accepted
int demodGallagher(bool verbose) {
(void) verbose; // unused so far
bool st = true;
if (ASKDemod_ext(32, 0, 100, 0, false, false, false, 1, &st) != PM3_SUCCESS) {
PrintAndLogEx(DEBUG, "DEBUG: Error - GALLAGHER: ASKDemod failed");
return PM3_ESOFT;
}
size_t size = DemodBufferLen;
int ans = detectGallagher(DemodBuffer, &size);
if (ans < 0) {
if (ans == -1)
PrintAndLogEx(DEBUG, "DEBUG: Error - GALLAGHER: too few bits found");
else if (ans == -2)
PrintAndLogEx(DEBUG, "DEBUG: Error - GALLAGHER: preamble not found");
else if (ans == -3)
PrintAndLogEx(DEBUG, "DEBUG: Error - GALLAGHER: Size not correct: %zu", size);
else
PrintAndLogEx(DEBUG, "DEBUG: Error - GALLAGHER: ans: %d", ans);
return PM3_ESOFT;
}
setDemodBuff(DemodBuffer, 96, ans);
setClockGrid(g_DemodClock, g_DemodStartIdx + (ans * g_DemodClock));
// got a good demod
uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
uint32_t raw2 = bytebits_to_byte(DemodBuffer + 32, 32);
uint32_t raw3 = bytebits_to_byte(DemodBuffer + 64, 32);
// bytes
uint8_t arr[8] = {0};
for (int i = 0, pos = 0; i < ARRAYLEN(arr); i++) {
pos = 16 + (9 * i);
arr[i] = bytebits_to_byte(DemodBuffer + pos, 8);
}
// crc
uint8_t crc = bytebits_to_byte(DemodBuffer + 16 + (9 * 8), 8);
uint8_t calc_crc = CRC8Cardx(arr, ARRAYLEN(arr));
descramble(arr, ARRAYLEN(arr));
// 4bit region code
uint8_t rc = (arr[3] & 0x1E) >> 1;
// 16bit FC
uint16_t fc = (arr[5] & 0x0F) << 12 | arr[1] << 4 | ((arr[7] >> 4) & 0x0F);
// 24bit CN
uint32_t cn = arr[0] << 16 | (arr[4] & 0x1F) << 11 | arr[2] << 3 | (arr[3] & 0xE0) >> 5;
// 4bit issue level
uint8_t il = arr[7] & 0x0F;
PrintAndLogEx(SUCCESS, "GALLAGHER - Region: " _GREEN_("%u") " FC: " _GREEN_("%u") " CN: " _GREEN_("%u") " Issue Level: " _GREEN_("%u"), rc, fc, cn, il);
PrintAndLogEx(SUCCESS, " Displayed: " _GREEN_("%C%u"), rc + 'A', fc);
PrintAndLogEx(SUCCESS, " Raw: %08X%08X%08X", raw1, raw2, raw3);
PrintAndLogEx(SUCCESS, " CRC: %02X - %02X (%s)", crc, calc_crc, (crc == calc_crc) ? "ok" : "fail");
return PM3_SUCCESS;
}
static int CmdGallagherDemod(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf gallagher demod",
"Try to find GALLAGHER preamble, if found decode / descramble data",
"lf gallagher demod"
);
void *argtable[] = {
arg_param_begin,
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, true);
CLIParserFree(ctx);
return demodGallagher(true);
}
static int CmdGallagherReader(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf gallagher reader",
"read a GALLAGHER tag",
"lf gallagher 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, 4096 * 2 + 20);
demodGallagher(!cm);
} while (cm && !kbd_enter_pressed());
return PM3_SUCCESS;
}
static bool isValidGallagherParams(int8_t rc, int32_t fc, int32_t cn, int8_t il) {
bool isValid = true;
// if one is set, all must be set
if (rc < 0 || fc < 0 || cn < 0 || il < 0) {
PrintAndLogEx(FAILED, "If rc/fc/cn/il is specified, all must be set");
isValid = false;
}
// validate input
if (rc > 0x0f) {
PrintAndLogEx(FAILED, "Region code must be less than 16 (4 bits)");
isValid = false;
}
if (fc > 0xffff) {
PrintAndLogEx(FAILED, "Facility code must be less than 65536 (2 bytes)");
isValid = false;
}
if (cn > 0xffffff) {
PrintAndLogEx(FAILED, "Card number must be less than 16777216 (3 bytes)");
isValid = false;
}
if (il > 0x0f) {
PrintAndLogEx(FAILED, "Issue level must be less than 16 (4 bits)");
isValid = false;
}
return isValid;
}
static void setBitsInBlocks(uint32_t *blocks, uint8_t *pos, uint32_t data, uint8_t data_len) {
for (int i = data_len - 1; i >= 0; i--) {
uint8_t blk = *pos / 32;
uint8_t bitPos = 31 - *pos % 32; // fill from left
uint8_t bit = (data >> i) & 1;
blocks[blk] |= bit << bitPos;
(*pos)++;
}
}
static void createBlocks(uint32_t *blocks, uint8_t rc, uint16_t fc, uint32_t cn, uint8_t il) {
// put data into the correct places (Gallagher obfuscation)
uint8_t arr[8] = {0};
arr[0] = (cn & 0xffffff) >> 16;
arr[1] = (fc & 0xfff) >> 4;
arr[2] = (cn & 0x7ff) >> 3;
arr[3] = (cn & 0x7) << 5 | (rc & 0xf) << 1;
arr[4] = (cn & 0xffff) >> 11;
arr[5] = (fc & 0xffff) >> 12;
arr[6] = 0;
arr[7] = (fc & 0xf) << 4 | (il & 0xf);
// more obfuscation
scramble(arr, ARRAYLEN(arr));
blocks[0] = blocks[1] = blocks[2] = 0;
uint8_t pos = 0;
// magic prefix
setBitsInBlocks(blocks, &pos, 0x7fea, 16);
for (int i = 0; i < ARRAYLEN(arr); i++) {
// data byte
setBitsInBlocks(blocks, &pos, arr[i], 8);
// every byte is followed by a bit which is the inverse of the last bit
setBitsInBlocks(blocks, &pos, !(arr[i] & 0x1), 1);
}
// checksum
uint8_t crc = CRC8Cardx(arr, ARRAYLEN(arr));
setBitsInBlocks(blocks, &pos, crc, 8);
}
static int CmdGallagherClone(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf gallagher clone",
"clone a GALLAGHER tag to a T55x7, Q5/T5555 or EM4305/4469 tag.",
"lf gallagher clone --raw 0FFD5461A9DA1346B2D1AC32\n"
"lf gallagher clone --q5 --raw 0FFD5461A9DA1346B2D1AC32 -> encode for Q5/T5555 tag\n"
"lf gallagher clone --em --raw 0FFD5461A9DA1346B2D1AC32 -> encode for EM4305/4469\n"
"lf gallagher clone --rc 0 --fc 9876 --cn 1234 --il 1"
);
void *argtable[] = {
arg_param_begin,
arg_str0("r", "raw", "<hex>", "raw hex data. 12 bytes max"),
arg_lit0(NULL, "q5", "optional - specify writing to Q5/T5555 tag"),
arg_lit0(NULL, "em", "optional - specify writing to EM4305/4469 tag"),
arg_int0(NULL, "rc", "<decimal>", "Region code. 4 bits max"),
arg_int0(NULL, "fc", "<decimal>", "Facility code. 2 bytes max"),
arg_int0(NULL, "cn", "<decimal>", "Card number. 3 bytes max"),
arg_int0(NULL, "il", "<decimal>", "Issue level. 4 bits max"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, false);
int raw_len = 0;
// skip first block, 3*4 = 12 bytes left
uint8_t raw[12] = {0};
int res = CLIParamHexToBuf(arg_get_str(ctx, 1), raw, sizeof raw, &raw_len);
if (res) {
CLIParserFree(ctx);
return PM3_EINVARG;
}
bool q5 = arg_get_lit(ctx, 2);
bool em = arg_get_lit(ctx, 3);
int16_t region_code = arg_get_int_def(ctx, 4, -1);
int32_t facility_code = arg_get_int_def(ctx, 5, -1);
uint64_t card_number = arg_get_int_def(ctx, 6, -1);
uint32_t issue_level = arg_get_int_def(ctx, 7, -1);
CLIParserFree(ctx);
bool use_raw = raw_len > 0;
if (q5 && em) {
PrintAndLogEx(FAILED, "Can't specify both Q5 and EM4305 at the same time");
return PM3_EINVARG;
}
if (region_code == -1 && facility_code == -1 && card_number == -1 && issue_level == -1) {
if (!use_raw) {
PrintAndLogEx(FAILED, "Must specify either raw data to clone, or rc/fc/cn/il");
return PM3_EINVARG;
}
} else {
// --raw and --rc/fc/cn/il are mutually exclusive
if (use_raw) {
PrintAndLogEx(FAILED, "Can't specify both raw and rc/fc/cn/il at the same time");
return PM3_EINVARG;
}
if (!isValidGallagherParams(region_code, facility_code, card_number, issue_level)) {
return PM3_EINVARG;
}
}
uint32_t blocks[4];
if (use_raw) {
for (uint8_t i = 1; i < ARRAYLEN(blocks); i++) {
blocks[i] = bytes_to_num(raw + ((i - 1) * 4), sizeof(uint32_t));
}
} else {
// fill blocks 1 to 3 with Gallagher data
createBlocks(blocks + 1, region_code, facility_code, card_number, issue_level);
}
//Pac - compat mode, NRZ, data rate 40, 3 data blocks
blocks[0] = T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_32 | 3 << T55x7_MAXBLOCK_SHIFT;
char cardtype[16] = {"T55x7"};
// Q5
if (q5) {
blocks[0] = T5555_FIXED | T5555_MODULATION_MANCHESTER | T5555_SET_BITRATE(32) | 3 << T5555_MAXBLOCK_SHIFT;
snprintf(cardtype, sizeof(cardtype), "Q5/T5555");
}
// EM4305
if (em) {
blocks[0] = EM4305_GALLAGHER_CONFIG_BLOCK;
snprintf(cardtype, sizeof(cardtype), "EM4305/4469");
}
PrintAndLogEx(INFO, "Preparing to clone Gallagher to " _YELLOW_("%s") " from %s.",
cardtype, use_raw ? "raw hex" : "specified data");
print_blocks(blocks, ARRAYLEN(blocks));
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 gallagher reader`") " to verify");
return res;
}
static int CmdGallagherSim(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "lf gallagher sim",
"Enables simulation of GALLAGHER card with specified card number.\n"
"Simulation runs until the button is pressed or another USB command is issued.\n",
"lf gallagher sim --raw 0FFD5461A9DA1346B2D1AC32\n"
"lf gallagher sim --rc 0 --fc 9876 --cn 1234 --il 1"
);
void *argtable[] = {
arg_param_begin,
arg_str0("r", "raw", "<hex>", "raw hex data. 12 bytes max"),
arg_int0(NULL, "rc", "<decimal>", "Region code. 4 bits max"),
arg_int0(NULL, "fc", "<decimal>", "Facility code. 2 bytes max"),
arg_int0(NULL, "cn", "<decimal>", "Card number. 3 bytes max"),
arg_int0(NULL, "il", "<decimal>", "Issue level. 4 bits max"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, false);
int raw_len = 0;
// skip first block, 3*4 = 12 bytes left
uint8_t raw[12] = {0};
CLIGetHexWithReturn(ctx, 1, raw, &raw_len);
int res = CLIParamHexToBuf(arg_get_str(ctx, 1), raw, sizeof raw, &raw_len);
if (res) {
CLIParserFree(ctx);
return PM3_EINVARG;
}
int16_t region_code = arg_get_int_def(ctx, 2, -1);
int32_t facility_code = arg_get_int_def(ctx, 3, -1);
uint64_t card_number = arg_get_int_def(ctx, 4, -1);
uint32_t issue_level = arg_get_int_def(ctx, 5, -1);
CLIParserFree(ctx);
bool use_raw = raw_len > 0;
if (region_code == -1 && facility_code == -1 && card_number == -1 && issue_level == -1) {
if (!use_raw) {
PrintAndLogEx(FAILED, "Must specify either raw data to clone, or rc/fc/cn/il");
return PM3_EINVARG;
}
} else {
// --raw and --rc/fc/cn/il are mutually exclusive
if (use_raw) {
PrintAndLogEx(FAILED, "Can't specify both raw and rc/fc/cn/il at the same time");
return PM3_EINVARG;
}
if (!isValidGallagherParams(region_code, facility_code, card_number, issue_level)) {
return PM3_EINVARG;
}
}
if (!use_raw) {
// generate Gallagher data
uint32_t blocks[3];
createBlocks(blocks, region_code, facility_code, card_number, issue_level);
// convert to the normal 'raw' format
for (int i = 0; i < ARRAYLEN(blocks); i++) {
raw[(4 * i) + 0] = (blocks[i] >> 24) & 0xff;
raw[(4 * i) + 1] = (blocks[i] >> 16) & 0xff;
raw[(4 * i) + 2] = (blocks[i] >> 8) & 0xff;
raw[(4 * i) + 3] = (blocks[i]) & 0xff;
}
}
// ASK/MAN sim.
PrintAndLogEx(SUCCESS, "Simulating Gallagher - raw " _YELLOW_("%s"), sprint_hex_inrow(raw, sizeof(raw)));
uint8_t bs[sizeof(raw) * 8];
bytes_to_bytebits(raw, sizeof(raw), bs);
lf_asksim_t *payload = calloc(1, sizeof(lf_asksim_t) + sizeof(bs));
payload->encoding = 1;
payload->invert = 0;
payload->separator = 0;
payload->clock = 32;
memcpy(payload->data, bs, sizeof(bs));
clearCommandBuffer();
SendCommandNG(CMD_LF_ASK_SIMULATE, (uint8_t *)payload, sizeof(lf_asksim_t) + sizeof(bs));
free(payload);
return lfsim_wait_check(CMD_LF_ASK_SIMULATE);
}
static command_t CommandTable[] = {
{"help", CmdHelp, AlwaysAvailable, "This help"},
{"demod", CmdGallagherDemod, AlwaysAvailable, "demodulate an GALLAGHER tag from the GraphBuffer"},
{"reader", CmdGallagherReader, IfPm3Lf, "attempt to read and extract tag data"},
{"clone", CmdGallagherClone, IfPm3Lf, "clone GALLAGHER tag to T55x7"},
{"sim", CmdGallagherSim, IfPm3Lf, "simulate GALLAGHER 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 CmdLFGallagher(const char *Cmd) {
clearCommandBuffer();
return CmdsParse(CommandTable, Cmd);
}
// find Gallagher preamble in already demoded data
int detectGallagher(uint8_t *dest, size_t *size) {
if (*size < 96) return -1; //make sure buffer has data
size_t startIdx = 0;
uint8_t preamble[] = { 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0 };
if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
return -2; //preamble not found
if (*size != 96) return -3; //wrong demoded size
//return start position
return (int)startIdx;
}
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