//-----------------------------------------------------------------------------
//
// 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 Presco tag commands
//-----------------------------------------------------------------------------
#include "cmdlfpresco.h"
static int CmdHelp(const char *Cmd);
int usage_lf_presco_clone(void) {
PrintAndLogEx(NORMAL, "clone a Presco tag to a T55x7 tag.");
PrintAndLogEx(NORMAL, "Usage: lf presco clone [h] d <Card-ID> c <hex-ID> <Q5>");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h : this help");
PrintAndLogEx(NORMAL, " d <Card-ID> : 9 digit presco card ID");
PrintAndLogEx(NORMAL, " c <hex-ID> : 8 digit hex card number");
PrintAndLogEx(NORMAL, " <Q5> : specify write to Q5 (t5555 instead of t55x7)");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf presco clone d 123456789");
return 0;
}
int usage_lf_presco_sim(void) {
PrintAndLogEx(NORMAL, "Enables simulation of presco card with specified card number.");
PrintAndLogEx(NORMAL, "Simulation runs until the button is pressed or another USB command is issued.");
PrintAndLogEx(NORMAL, "Per presco format, the card number is 9 digit number and can contain *# chars. Larger values are truncated.");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Usage: lf presco sim [h] d <Card-ID> or c <hex-ID>");
PrintAndLogEx(NORMAL, "Options:");
PrintAndLogEx(NORMAL, " h : this help");
PrintAndLogEx(NORMAL, " d <Card-ID> : 9 digit presco card number");
PrintAndLogEx(NORMAL, " c <hex-ID> : 8 digit hex card number");
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(NORMAL, "Examples:");
PrintAndLogEx(NORMAL, " lf presco sim d 123456789");
return 0;
}
// find presco preamble 0x10D in already demoded data
int detectPresco(uint8_t *dest, size_t *size) {
if (*size < 128 * 2) return -1; //make sure buffer has data
size_t startIdx = 0;
uint8_t preamble[] = {0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
return -2; //preamble not found
if (*size != 128) return -3; //wrong demoded size
//return start position
return (int)startIdx;
}
// convert base 12 ID to sitecode & usercode & 8 bit other unknown code
int GetWiegandFromPresco(const char *Cmd, uint32_t *sitecode, uint32_t *usercode, uint32_t *fullcode, bool *Q5) {
uint8_t val = 0;
bool hex = false, errors = false;
uint8_t cmdp = 0;
char id[11];
int stringlen = 0;
memset(id, 0x00, sizeof(id));
while (param_getchar(Cmd, cmdp) != 0x00 && !errors) {
switch (tolower(param_getchar(Cmd, cmdp))) {
case 'h':
return -1;
case 'c':
hex = true;
//get hex
*fullcode = param_get32ex(Cmd, cmdp + 1, 0, 16);
cmdp += 2;
break;
case 'd':
//param get string int param_getstr(const char *line, int paramnum, char * str)
stringlen = param_getstr(Cmd, cmdp + 1, id, sizeof(id));
if (stringlen < 2) return -1;
cmdp += 2;
break;
case 'q':
*Q5 = true;
cmdp++;
break;
default:
PrintAndLogEx(WARNING, "Unknown parameter '%c'", param_getchar(Cmd, cmdp));
errors = 1;
break;
}
}
//Validations
if (errors || cmdp == 0) return -1;
if (!hex) {
for (int index = 0; index < strlen(id); ++index) {
// Get value from number string.
if (id[index] == '*')
val = 10;
if (id[index] == '#')
val = 11;
if (id[index] >= 0x30 && id[index] <= 0x39)
val = id[index] - 0x30;
*fullcode += val;
// last digit is only added, not multipled.
if (index < strlen(id) - 1)
*fullcode *= 12;
}
}
*usercode = *fullcode & 0x0000FFFF; //% 65566
*sitecode = (*fullcode >> 24) & 0x000000FF; // /= 16777216;
return 0;
}
// calc not certain - intended to get bitstream for programming / sim
int GetPrescoBits(uint32_t fullcode, uint8_t *prescoBits) {
num_to_bytebits(0x10D00000, 32, prescoBits);
num_to_bytebits(0x00000000, 32, prescoBits + 32);
num_to_bytebits(0x00000000, 32, prescoBits + 64);
num_to_bytebits(fullcode, 32, prescoBits + 96);
return 1;
}
//see ASKDemod for what args are accepted
int CmdPrescoDemod(const char *Cmd) {
bool st = true;
if (!ASKDemod_ext("32 0 0 0 0 a", false, false, 1, &st)) {
PrintAndLogEx(DEBUG, "DEBUG: Error Presco ASKDemod failed");
return 0;
}
size_t size = DemodBufferLen;
int ans = detectPresco(DemodBuffer, &size);
if (ans < 0) {
if (ans == -1)
PrintAndLogEx(DEBUG, "DEBUG: Error - Presco: too few bits found");
else if (ans == -2)
PrintAndLogEx(DEBUG, "DEBUG: Error - Presco: preamble not found");
else if (ans == -3)
PrintAndLogEx(DEBUG, "DEBUG: Error - Presco: Size not correct: %d", size);
else
PrintAndLogEx(DEBUG, "DEBUG: Error - Presco: ans: %d", ans);
return 0;
}
setDemodBuff(DemodBuffer, 128, 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);
uint32_t raw4 = bytebits_to_byte(DemodBuffer + 96, 32);
uint32_t cardid = raw4;
PrintAndLogEx(SUCCESS, "Presco Tag Found: Card ID %08X, Raw: %08X%08X%08X%08X", cardid, raw1, raw2, raw3, raw4);
uint32_t sitecode = 0, usercode = 0, fullcode = 0;
bool Q5 = false;
char cmd[12] = {0};
sprintf(cmd, "H %08X", cardid);
GetWiegandFromPresco(cmd, &sitecode, &usercode, &fullcode, &Q5);
PrintAndLogEx(SUCCESS, "SiteCode %u, UserCode %u, FullCode, %08X", sitecode, usercode, fullcode);
return 1;
}
//see ASKDemod for what args are accepted
int CmdPrescoRead(const char *Cmd) {
// Presco Number: 123456789 --> Sitecode 30 | usercode 8665
lf_read(true, 12000);
return CmdPrescoDemod(Cmd);
}
// takes base 12 ID converts to hex
// Or takes 8 digit hex ID
int CmdPrescoClone(const char *Cmd) {
bool Q5 = false;
uint32_t sitecode = 0, usercode = 0, fullcode = 0;
uint32_t blocks[5] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_32 | 4 << T55x7_MAXBLOCK_SHIFT | T55x7_ST_TERMINATOR, 0, 0, 0, 0};
// get wiegand from printed number.
if (GetWiegandFromPresco(Cmd, &sitecode, &usercode, &fullcode, &Q5) == -1) return usage_lf_presco_clone();
if (Q5)
blocks[0] = T5555_MODULATION_MANCHESTER | T5555_SET_BITRATE(32) | 4 << T5555_MAXBLOCK_SHIFT | T5555_ST_TERMINATOR;
if ((sitecode & 0xFF) != sitecode) {
sitecode &= 0xFF;
PrintAndLogEx(INFO, "Facility-Code Truncated to 8-bits (Presco): %u", sitecode);
}
if ((usercode & 0xFFFF) != usercode) {
usercode &= 0xFFFF;
PrintAndLogEx(INFO, "Card Number Truncated to 16-bits (Presco): %u", usercode);
}
blocks[1] = 0x10D00000; //preamble
blocks[2] = 0x00000000;
blocks[3] = 0x00000000;
blocks[4] = fullcode;
PrintAndLogEx(INFO, "Preparing to clone Presco to T55x7 with SiteCode: %u, UserCode: %u, FullCode: %08x", sitecode, usercode, fullcode);
print_blocks(blocks, 5);
UsbCommand resp;
UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0, 0, 0}};
for (uint8_t i = 0; i < 5; 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;
}
// takes base 12 ID converts to hex
// Or takes 8 digit hex ID
int CmdPrescoSim(const char *Cmd) {
uint32_t sitecode = 0, usercode = 0, fullcode = 0;
bool Q5 = false;
// get wiegand from printed number.
if (GetWiegandFromPresco(Cmd, &sitecode, &usercode, &fullcode, &Q5) == -1) return usage_lf_presco_sim();
uint8_t clk = 32, encoding = 1, separator = 1, invert = 0;
uint16_t arg1, arg2;
size_t size = 128;
arg1 = clk << 8 | encoding;
arg2 = invert << 8 | separator;
PrintAndLogEx(SUCCESS, "Simulating Presco - SiteCode: %u, UserCode: %u, FullCode: %08X", sitecode, usercode, fullcode);
UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
GetPrescoBits(fullcode, c.d.asBytes);
clearCommandBuffer();
SendCommand(&c);
return 0;
}
static command_t CommandTable[] = {
{"help", CmdHelp, 1, "This help"},
{"read", CmdPrescoRead, 0, "Attempt to read and Extract tag data"},
{"clone", CmdPrescoClone, 0, "clone presco tag"},
{"sim", CmdPrescoSim, 0, "simulate presco tag"},
{NULL, NULL, 0, NULL}
};
int CmdLFPresco(const char *Cmd) {
clearCommandBuffer();
CmdsParse(CommandTable, Cmd);
return 0;
}
int CmdHelp(const char *Cmd) {
CmdsHelp(CommandTable);
return 0;
}