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simulate/read
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tharexde
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297
armsrc/Standalone/lf_tharexde.c
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297
armsrc/Standalone/lf_tharexde.c
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//-----------------------------------------------------------------------------
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// Tharexde, 2020
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// main code for EM4x50 simulator and collector aka THAREXDE
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//-----------------------------------------------------------------------------
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#include <inttypes.h>
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#include "standalone.h"
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#include "proxmark3_arm.h"
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#include "appmain.h"
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#include "BigBuf.h"
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#include "fpgaloader.h"
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#include "util.h"
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#include "dbprint.h"
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#include "spiffs.h"
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#include "../em4x50.h"
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/*
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* `lf_tharexde` simulates hardcoded words/blocks, reads words of standard read
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* mode of EM4x50 tags and stores them in internal flash.
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* It requires RDV4 hardware (for flash and battery).
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*
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* On entering stand-alone mode, this module will start reading/record EM4x50 data.
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* Every found / collected data will be written/appended to the logfile in flash
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* as a text string.
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*
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* LEDs:
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* - LED A: simulating
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* - LED B: reading / record
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* - LED C: writing to flash
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* - LED D: unmounting/sync'ing flash (normally < 100ms)
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*
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* To retrieve log file from flash:
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*
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* 1. mem spiffs dump o lf_em4x50collect.log f lf_em4x50collect.log
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* Copies log file from flash to your client.
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*
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* 2. exit the Proxmark3 client
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*
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* 3. more lf_tharexdecollect.log
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*
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* This module emits debug strings during normal operation -- so try it out in
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* the lab connected to PM3 client before taking it into the field.
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*
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* To delete the log file from flash:
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*
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* 1. mem spiffs remove lf_tharexdecollect.log
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*/
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#define STATE_SIM 0
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#define STATE_READ 1
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#define LF_EM4X50SIMULATE_INPUTFILE "lf_em4x50simulate.eml"
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#define LF_EM4X50COLLECT_LOGFILE "lf_em4x50collect.log"
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#define EM4X50_TAG_WORD 45
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bool input_exists;
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bool log_exists;
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static void LoadDataInstructions(void) {
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Dbprintf("");
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Dbprintf("[=] To load datafile into flash and display it:");
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Dbprintf("[=] " _YELLOW_("1.") " edit inputfile "LF_EM4X50SIMULATE_INPUTFILE);
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Dbprintf("[=] " _YELLOW_("2.") " start proxmark3 client");
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Dbprintf("[=] " _YELLOW_("3.") " mem spiffs load f "LF_EM4X50SIMULATE_INPUTFILE" o "LF_EM4X50SIMULATE_INPUTFILE);
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Dbprintf("[=] " _YELLOW_("4.") " start standalone mode");
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}
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static void DownloadLogInstructions(void) {
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Dbprintf("");
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Dbprintf("[=] To get the logfile from flash and display it:");
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Dbprintf("[=] " _YELLOW_("1.") " mem spiffs dump o "LF_EM4X50COLLECT_LOGFILE" f "LF_EM4X50COLLECT_LOGFILE);
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Dbprintf("[=] " _YELLOW_("2.") " exit proxmark3 client");
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Dbprintf("[=] " _YELLOW_("3.") " cat "LF_EM4X50COLLECT_LOGFILE);
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}
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static bool strip_check_parities(uint64_t data, uint32_t *word) {
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uint8_t rparity = 0, cparity = 0;
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uint8_t rparity_m = 0, cparity_m = 0, stop_bit_m = 0;
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// strip parities
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 8; j++) {
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*word <<= 1;
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*word += (data >> (EM4X50_TAG_WORD - 1 - 9 * i - j)) & 1;
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}
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}
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// calculate row parities
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for (int i = 0; i < 4; i++) {
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rparity <<= 1;
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for (int j = 0; j < 8; j++) {
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rparity ^= (*word >> (31 - 8 * i - j)) & 1;
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}
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}
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// calculate column parities
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for (int i = 0; i < 8; i++) {
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cparity <<= 1;
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for (int j = 0; j < 4; j++) {
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cparity ^= (*word >> (31 - 8 * j - i)) & 1;
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}
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}
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// measured row parities
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for (int i = 0; i < 4; i++) {
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rparity_m <<= 1;
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rparity_m += (data >> (EM4X50_TAG_WORD - 9 * (i + 1))) & 1;
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}
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// measured column parities
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cparity_m = (data >> 1) & 0xFF;
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// measured stop bit
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stop_bit_m = data & 1;
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if ((cparity_m == cparity) && (rparity_m == rparity) && (stop_bit_m == 0))
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return true;
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return false;
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}
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static int get_input_data_from_file(uint32_t *words) {
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size_t now = 0;
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if (exists_in_spiffs(LF_EM4X50SIMULATE_INPUTFILE)) {
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uint32_t size = size_in_spiffs((char *)LF_EM4X50SIMULATE_INPUTFILE);
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uint8_t *mem = BigBuf_malloc(size);
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Dbprintf(_YELLOW_("[=] found input file %s"), LF_EM4X50SIMULATE_INPUTFILE);
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rdv40_spiffs_read_as_filetype((char *)LF_EM4X50SIMULATE_INPUTFILE, mem, size, RDV40_SPIFFS_SAFETY_SAFE);
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now = size / 9;
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for (int i = 0; i < now; i++)
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for (int j = 0; j < 4; j++)
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words[i] |= (hex2int(mem[2 * j + 9 * i]) << 4 | hex2int(mem[2 * j + 1 + 9 * i])) << ((3 - j) * 8);
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Dbprintf(_YELLOW_("[=] read data from input file"));
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}
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BigBuf_free();
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return (now > 0) ? now : 0;
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}
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static void append(uint8_t *entry, size_t entry_len) {
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LED_C_ON();
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if (log_exists == false) {
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rdv40_spiffs_write(LF_EM4X50COLLECT_LOGFILE, entry, entry_len, RDV40_SPIFFS_SAFETY_SAFE);
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log_exists = true;
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} else {
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rdv40_spiffs_append(LF_EM4X50COLLECT_LOGFILE, entry, entry_len, RDV40_SPIFFS_SAFETY_SAFE);
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}
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LED_C_OFF();
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}
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void ModInfo(void) {
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DbpString(_YELLOW_(" LF EM4x50 collector mode") " - a.k.a tharexde");
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}
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void RunMod(void) {
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bool state_change = true;
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uint8_t state = STATE_SIM;
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// declarations for simulating
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uint32_t words[33] = {0x0};
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size_t now = 0;
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// declarations for reading
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int no_words = 0;
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uint64_t data[EM4X50_TAG_WORD];
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uint32_t word = 0;
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uint8_t entry[81];
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rdv40_spiffs_lazy_mount();
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StandAloneMode();
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Dbprintf(_YELLOW_("[=] Standalone mode THAREXDE started"));
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for (;;) {
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WDT_HIT();
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if (data_available()) break;
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// press button - toggle between SIM and READ
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// hold button - exit
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int button_pressed = BUTTON_CLICKED(1000);
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if (button_pressed == BUTTON_SINGLE_CLICK) {
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SpinUp(100);
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state = (state == STATE_SIM) ? STATE_READ : STATE_SIM;
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state_change = true;
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} else if (button_pressed == BUTTON_HOLD) {
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SpinDown(100);
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break;
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}
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if (state == STATE_SIM) {
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if (state_change) {
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FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
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FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT);
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FpgaSendCommand(FPGA_CMD_SET_DIVISOR, LF_DIVISOR_125);
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AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT | GPIO_SSC_CLK;
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AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
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AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_CLK;
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LED_A_ON();
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LED_B_OFF();
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Dbprintf(_YELLOW_("[=] switched to EM4x50 simulating mode"));
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now = get_input_data_from_file(words);
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if (now > 0) {
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Dbprintf(_YELLOW_("[=] simulating %i blocks"), now);
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for (int i = 0; i < now; i++)
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Dbprintf(_YELLOW_("[=] %2i -> %lx"), i + 1, words[i]);
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} else {
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Dbprintf(_RED_("[!] error in input data"));
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}
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state_change = false;
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}
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em4x50_sim_send_listen_window2();
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for (int i = 0; i < now; i++) {
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em4x50_sim_send_listen_window2();
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em4x50_sim_send_word3(words[i]);
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}
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} else if (state == STATE_READ) {
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if (state_change) {
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LED_B_ON();
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LED_A_OFF();
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Dbprintf(_YELLOW_("[=] switched to EM4x50 reading mode"));
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memset(entry, 0, sizeof(entry));
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memset(data, 0, sizeof(data));
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log_exists = exists_in_spiffs(LF_EM4X50COLLECT_LOGFILE);
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state_change = false;
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}
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no_words = em4x50_standalone_read(data);
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if (no_words > 0) {
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memset(entry, 0, sizeof(entry));
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sprintf((char *)entry, "found new EM4x50 tag:");
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Dbprintf("%s", entry);
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strcat((char *)entry, "\n");
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append(entry, strlen((char *)entry));
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for (int i = 0; i < no_words; i++) {
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if (strip_check_parities(data[i], &word))
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sprintf((char *)entry, " %2i -> 0x%08"PRIx32" (parity check ok)", i + 1, word);
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else
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sprintf((char *)entry, " %2i -> 0x%08"PRIx32" (parity check failed)", i + 1, word);
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Dbprintf("%s", entry);
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strcat((char *)entry, "\n");
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append(entry, strlen((char *)entry));
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}
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}
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}
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}
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if (state == STATE_READ)
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DownloadLogInstructions();
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else
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LoadDataInstructions();
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LED_D_ON();
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rdv40_spiffs_lazy_unmount();
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LED_D_OFF();
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FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
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LEDsoff();
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Dbprintf(_YELLOW_("[=] Standalone mode THAREXDE stopped"));
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}
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