//-----------------------------------------------------------------------------
//
// 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 KERI tag commands
// PSK1, RF/128, RF/2, 64 bits long
//-----------------------------------------------------------------------------
#include "cmdlfkeri.h"
static int CmdHelp(const char *Cmd);
int usage_lf_keri_clone(void) {
PrintAndLogEx(NORMAL, "clone a KERI tag to a T55x7 tag.");
PrintAndLogEx(NORMAL, "Usage: lf keri clone [h] <id> <Q5>");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h : This help");
PrintAndLogEx(NORMAL, " <id> : Keri Internal ID");
PrintAndLogEx(NORMAL, " <Q5> : specify write to Q5 (t5555 instead of t55x7)");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf keri clone 112233");
return 0;
}
int usage_lf_keri_sim(void) {
PrintAndLogEx(NORMAL, "Enables simulation of KERI card with specified card number.");
PrintAndLogEx(NORMAL, "Simulation runs until the button is pressed or another USB command is issued.");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Usage: lf keri sim [h] <id>");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h : This help");
PrintAndLogEx(NORMAL, " <id> : Keri Internal ID");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf keri sim 112233");
return 0;
}
// find KERI preamble in already demoded data
int detectKeri(uint8_t *dest, size_t *size, bool *invert) {
uint8_t preamble[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
uint8_t preamble_i[] = {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0};
// sanity check.
if (*size < sizeof(preamble) + 100) return -1;
size_t startIdx = 0;
if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx)) {
// if didn't find preamble try again inverting
if (!preambleSearch(DemodBuffer, preamble_i, sizeof(preamble_i), size, &startIdx))
return -2;
*invert ^= 1;
}
if (*size != 64) return -3; //wrong demoded size
return (int)startIdx;
}
int CmdKeriDemod(const char *Cmd) {
if (!PSKDemod("", false)) {
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: PSK1 Demod failed");
return 0;
}
bool invert = false;
size_t size = DemodBufferLen;
int idx = detectKeri(DemodBuffer, &size, &invert);
if (idx < 0) {
if (idx == -1)
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: too few bits found");
else if (idx == -2)
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: preamble not found");
else if (idx == -3)
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: Size not correct: 64 != %d", size);
else
PrintAndLogEx(DEBUG, "DEBUG: Error - KERI: ans: %d", idx);
return 0;
}
setDemodBuf(DemodBuffer, size, idx);
setClockGrid(g_DemodClock, g_DemodStartIdx + (idx * g_DemodClock));
//got a good demod
uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
uint32_t raw2 = bytebits_to_byte(DemodBuffer + 32, 32);
//get internal id
uint32_t ID = bytebits_to_byte(DemodBuffer + 29, 32);
ID &= 0x7FFFFFFF;
/*
000000000000000000000000000001XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX111
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^1###############################^^^
Preamble block 29 bits of ZEROS
32 bit Internal ID (First bit always 1)
3 bit of 1s in the end
How this is decoded to Facility ID, Card number is unknown
Facility ID = 0-31 (indicates 5 bits)
Card number = up to 10 digits
Might be a hash of FC & CN to generate Internal ID
*/
PrintAndLogEx(SUCCESS, "KERI Tag Found -- Internal ID: %u", ID);
PrintAndLogEx(SUCCESS, "Raw: %08X%08X", raw1, raw2);
if (invert) {
PrintAndLogEx(INFO, "Had to Invert - probably KERI");
for (size_t i = 0; i < size; i++)
DemodBuffer[i] ^= 1;
CmdPrintDemodBuff("x");
}
return 1;
}
int CmdKeriRead(const char *Cmd) {
lf_read(true, 10000);
return CmdKeriDemod(Cmd);
}
int CmdKeriClone(const char *Cmd) {
uint32_t internalid = 0;
uint32_t blocks[3] = {
T55x7_TESTMODE_DISABLED |
T55x7_X_MODE |
T55x7_MODULATION_PSK1 |
T55x7_PSKCF_RF_2 |
2 << T55x7_MAXBLOCK_SHIFT,
0,
0
};
// dynamic bitrate used
blocks[0] |= 0xF << 18;
char cmdp = tolower(param_getchar(Cmd, 0));
if (strlen(Cmd) == 0 || cmdp == 'h') return usage_lf_keri_clone();
internalid = param_get32ex(Cmd, 0, 0, 10);
//Q5
if (tolower(param_getchar(Cmd, 1)) == 'q') {
blocks[0] =
T5555_MODULATION_PSK1 |
T5555_SET_BITRATE(128) |
T5555_PSK_RF_2 |
2 << T5555_MAXBLOCK_SHIFT;
}
// MSB is ONE
internalid |= 0x80000000;
// 3 LSB is ONE
uint64_t data = ((uint64_t)internalid << 3) + 7;
//
blocks[1] = data >> 32;
blocks[2] = data & 0xFFFFFFFF;
PrintAndLogEx(INFO, "Preparing to clone KERI to T55x7 with Internal Id: %u", internalid);
print_blocks(blocks, 3);
UsbCommand resp;
UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0, 0, 0}};
for (uint8_t i = 0; i < 3; i++) {
c.arg[0] = blocks[i];
c.arg[1] = i;
clearCommandBuffer();
SendCommand(&c);
if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)) {
PrintAndLogEx(WARNING, "Error occurred, device did not respond during write operation.");
return -1;
}
}
return 0;
}
int CmdKeriSim(const char *Cmd) {
char cmdp = tolower(param_getchar(Cmd, 0));
if (strlen(Cmd) == 0 || cmdp == 'h') return usage_lf_keri_sim();
uint64_t internalid = param_get32ex(Cmd, 0, 0, 10);
internalid |= 0x80000000;
internalid <<= 3;
internalid += 7;
uint8_t bits[64] = {0x00};
// loop to bits
uint8_t j = 0;
for (int8_t i = 63; i >= 0; --i) {
bits[j++] = ((internalid >> i) & 1);
}
uint8_t clk = 32, carrier = 2, invert = 0;
uint16_t arg1, arg2;
size_t size = 64;
arg1 = clk << 8 | carrier;
arg2 = invert;
PrintAndLogEx(SUCCESS, "Simulating KERI - Internal Id: %u", internalid);
UsbCommand c = {CMD_PSK_SIM_TAG, {arg1, arg2, size}};
memcpy(c.d.asBytes, bits, size);
clearCommandBuffer();
SendCommand(&c);
return 0;
}
static command_t CommandTable[] = {
{"help", CmdHelp, 1, "This help"},
{"demod", CmdKeriDemod, 1, "Demodulate an KERI tag from the GraphBuffer"},
{"read", CmdKeriRead, 0, "Attempt to read and extract tag data from the antenna"},
{"clone", CmdKeriClone, 0, "clone KERI to T55x7"},
{"sim", CmdKeriSim, 0, "simulate KERI tag"},
{NULL, NULL, 0, NULL}
};
int CmdLFKeri(const char *Cmd) {
clearCommandBuffer();
CmdsParse(CommandTable, Cmd);
return 0;
}
int CmdHelp(const char *Cmd) {
CmdsHelp(CommandTable);
return 0;
}