//-----------------------------------------------------------------------------
//
// 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 Viking tag commands (AKA FDI Matalec Transit)
// ASK/Manchester, RF/32, 64 bits (complete)
//-----------------------------------------------------------------------------
#include "cmdlfviking.h"
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "common.h"
#include "cmdparser.h" // command_t
#include "comms.h"
#include "ui.h"
#include "cmddata.h"
#include "cmdlf.h"
#include "lfdemod.h"
#include "commonutil.h" // num_to_bytes
static int CmdHelp(const char *Cmd);
static int usage_lf_viking_clone(void) {
PrintAndLogEx(NORMAL, "clone a Viking AM tag to a T55x7 tag.");
PrintAndLogEx(NORMAL, "Usage: lf viking clone <Card ID - 8 hex digits> <Q5>");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " <Card Number> : 8 digit hex viking card number");
PrintAndLogEx(NORMAL, " <Q5> : specify write to Q5 (t5555 instead of t55x7)");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf viking clone 1A337 Q5");
return PM3_SUCCESS;
}
static int usage_lf_viking_sim(void) {
PrintAndLogEx(NORMAL, "Enables simulation of viking card with specified card number.");
PrintAndLogEx(NORMAL, "Simulation runs until the button is pressed or another USB command is issued.");
PrintAndLogEx(NORMAL, "Per viking format, the card number is 8 digit hex number. Larger values are truncated.");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Usage: lf viking sim <Card-Number>");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " <Card Number> : 8 digit hex viking card number");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf viking sim 1A337");
return PM3_SUCCESS;
}
//by marshmellow
//see ASKDemod for what args are accepted
static int CmdVikingDemod(const char *Cmd) {
if (ASKDemod(Cmd, false, false, 1) != PM3_SUCCESS) {
PrintAndLogEx(DEBUG, "DEBUG: Error - Viking ASKDemod failed");
return PM3_ESOFT;
}
size_t size = DemodBufferLen;
int ans = detectViking(DemodBuffer, &size);
if (ans < 0) {
PrintAndLogEx(DEBUG, "DEBUG: Error - Viking Demod %d %s", ans, (ans == -5) ? _RED_("[chksum error]") : "");
return PM3_ESOFT;
}
//got a good demod
uint32_t raw1 = bytebits_to_byte(DemodBuffer + ans, 32);
uint32_t raw2 = bytebits_to_byte(DemodBuffer + ans + 32, 32);
uint32_t cardid = bytebits_to_byte(DemodBuffer + ans + 24, 32);
uint8_t checksum = bytebits_to_byte(DemodBuffer + ans + 32 + 24, 8);
PrintAndLogEx(SUCCESS, "Viking Tag Found: Card ID " _YELLOW_("%08X")" checksum "_YELLOW_("%02X"), cardid, checksum);
PrintAndLogEx(SUCCESS, "Raw hex: %08X%08X", raw1, raw2);
setDemodBuff(DemodBuffer, 64, ans);
setClockGrid(g_DemodClock, g_DemodStartIdx + (ans * g_DemodClock));
return PM3_SUCCESS;
}
//by marshmellow
//see ASKDemod for what args are accepted
static int CmdVikingRead(const char *Cmd) {
lf_read(true, 10000);
return CmdVikingDemod(Cmd);
}
static int CmdVikingClone(const char *Cmd) {
uint32_t id = 0;
uint64_t rawID = 0;
bool Q5 = false;
char cmdp = tolower(param_getchar(Cmd, 0));
if (strlen(Cmd) == 0 || cmdp == 'h') return usage_lf_viking_clone();
id = param_get32ex(Cmd, 0, 0, 16);
if (id == 0) return usage_lf_viking_clone();
cmdp = tolower(param_getchar(Cmd, 1));
if (cmdp == 'q')
Q5 = true;
rawID = getVikingBits(id);
struct p {
bool Q5;
uint8_t blocks[8];
} PACKED payload;
payload.Q5 = Q5;
num_to_bytes(rawID, 8, &payload.blocks[0]);
PrintAndLogEx(INFO, "Preparing to clone Viking tag - ID " _YELLOW_("%08X")" raw " _YELLOW_("%s"), id, sprint_hex(payload.blocks, sizeof(payload.blocks)));
clearCommandBuffer();
SendCommandNG(CMD_LF_VIKING_CLONE, (uint8_t *)&payload, sizeof(payload));
PacketResponseNG resp;
if (!WaitForResponseTimeout(CMD_LF_VIKING_CLONE, &resp, T55XX_WRITE_TIMEOUT)) {
PrintAndLogEx(ERR, "Error occurred, device did not respond during write operation.");
return PM3_ETIMEOUT;
}
return resp.status;
}
static int CmdVikingSim(const char *Cmd) {
uint32_t id = 0;
uint64_t rawID = 0;
char cmdp = tolower(param_getchar(Cmd, 0));
if (strlen(Cmd) == 0 || cmdp == 'h') return usage_lf_viking_sim();
id = param_get32ex(Cmd, 0, 0, 16);
if (id == 0) return usage_lf_viking_sim();
rawID = getVikingBits(id);
PrintAndLogEx(SUCCESS, "Simulating Viking - ID " _YELLOW_("%08X")" raw "_YELLOW_("%08X%08X"), id, (uint32_t)(rawID >> 32), (uint32_t)(rawID & 0xFFFFFFFF));
uint8_t bs[64];
num_to_bytebits(rawID, sizeof(bs), 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);
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", CmdVikingDemod, AlwaysAvailable, "Demodulate a Viking tag from the GraphBuffer"},
{"read", CmdVikingRead, IfPm3Lf, "Attempt to read and Extract tag data from the antenna"},
{"clone", CmdVikingClone, IfPm3Lf, "<8 digit ID number> clone viking tag"},
{"sim", CmdVikingSim, IfPm3Lf, "<8 digit ID number> simulate viking 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 CmdLFViking(const char *Cmd) {
clearCommandBuffer();
return CmdsParse(CommandTable, Cmd);
}
// calc checksum
uint64_t getVikingBits(uint32_t id) {
uint8_t checksum = ((id >> 24) & 0xFF) ^ ((id >> 16) & 0xFF) ^ ((id >> 8) & 0xFF) ^ (id & 0xFF) ^ 0xF2 ^ 0xA8;
uint64_t ret = (uint64_t)0xF2 << 56;
ret |= (uint64_t)id << 8;
ret |= checksum;
return ret;
}
// by marshmellow
// find viking preamble 0xF200 in already demoded data
int detectViking(uint8_t *src, size_t *size) {
//make sure buffer has data
if (*size < 64) return -2;
size_t startIdx = 0;
uint8_t preamble[] = {1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
if (!preambleSearch(src, preamble, sizeof(preamble), size, &startIdx))
return -4; //preamble not found
uint32_t checkCalc = bytebits_to_byte(src + startIdx, 8) ^
bytebits_to_byte(src + startIdx + 8, 8) ^
bytebits_to_byte(src + startIdx + 16, 8) ^
bytebits_to_byte(src + startIdx + 24, 8) ^
bytebits_to_byte(src + startIdx + 32, 8) ^
bytebits_to_byte(src + startIdx + 40, 8) ^
bytebits_to_byte(src + startIdx + 48, 8) ^
bytebits_to_byte(src + startIdx + 56, 8);
if (checkCalc != 0xA8) return -5;
if (*size != 64) return -6;
//return start position
return (int)startIdx;
}
int demodViking(void) {
return CmdVikingDemod("");
}