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proxmark3/armsrc/Standalone/lf_em4100rsww.c
Philippe Teuwen c9984985fd make miscchecks
2023-01-14 22:23:40 +01:00

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//-----------------------------------------------------------------------------
// Copyright by Łukasz Jurczyk, 2021-2022
//
// This code is licensed to you under the terms of the GNU GPL, version 3.
// See the LICENSE.txt file for the text of the license.
//-----------------------------------------------------------------------------
// LF rsww - This mode can read EM4100 tag, save it to flash (RDV4 only), emulate it, clone it to T55xx tag, validate the write and wipe T55xx tag.
//
// To recall stored ID from flash execute:
// mem spiffs dump -s lf
// then from shell:
// hexdump lf.bin -e '5/1 "%02X" /0 "\n"'
//
// To recall only LAST stored ID from flash use lf-last instead of lf file.
//
//-----------------------------------------------------------------------------
// Modes of operation:
//
// --- Read ---
// Proxmark reads an EM4100 tag. LED A is turned on. When the tag is detected, it is saved to flash (RDV4 only) and proxmark enters the emulation mode.
// It's the default mode for non-RDV4 devices, and if no previous read is present in the flash it's the default mode for RDV4 devices.
// Pressing the button exists reading mode and enters emulation mode (only if any read is present in the memory).
// Double pressing the button enters wiping mode.
//
// --- Emulate ---
// Proxmark emulates last read tag. LED B is turned on.
// It's the default mode for RDV4 if lf-last file is present on the flash.
// Pressing the button enters writing mode and clones the emulated tag.
// Double pressing the button enters the validation mode.
// Holding the button enters the reading mode.
//
// --- Write ---
// Proxmarks writes the last read tag. LEDs A and B are turned on.
// When writing is complete LEDs A and B blink three times and proxmark enters the emulation mode.
//
// --- Validate ---
// Proxmark reads an EM4100 tag. LED C is turned on.
// If tag matches the last saved tag, LED C blinks three times. If it doesn't all LEDs blink three times. Proxmark enters the emulation mode afterwards.
// The result of the read is DISCARDED.
// Pressing the button enters the emulation mode.
//
// --- Wipe ---
// Proxmark continously wipes all approached T55xx tags. LED D is turned on, LEDs A-C are blinking.
// Pressing the button enters the default mode (reading or emulation).
//-----------------------------------------------------------------------------
#include "standalone.h"
#include "proxmark3_arm.h"
#include "appmain.h"
#include "fpgaloader.h"
#include "util.h"
#include "dbprint.h"
#include "ticks.h"
#include "string.h"
#include "BigBuf.h"
#include "spiffs.h"
#include "inttypes.h"
#include "parity.h"
#include "lfops.h"
#ifdef WITH_FLASH
#include "flashmem.h"
char *filename = "lf";
char *filenameLast = "lf-last";
#endif
#define LF_CLOCK 64 // for 125kHz
#define LF_RWSB_T55XX_TYPE 1 // Tag type: 0 - T5555, 1-T55x7
static uint64_t low = 0;
static uint64_t low2 = 0;
static uint32_t high = 0;
static uint32_t high2 = 0;
static unsigned char mode = 0;
static int buflen;
void ModInfo(void) {
DbpString("=== LF EM4100 read/sim/write/wipe/validate ===");
}
static uint64_t rev_quads(uint64_t bits) {
uint64_t result = 0;
for (int i = 0; i < 16; i++) {
result += ((bits >> (60 - 4 * i)) & 0xf) << (4 * i);
}
return result >> 24;
}
static void fill_buff(uint8_t bit) {
uint8_t *bba = BigBuf_get_addr();
memset(bba + buflen, bit, LF_CLOCK / 2);
buflen += (LF_CLOCK / 2);
memset(bba + buflen, bit ^ 1, LF_CLOCK / 2);
buflen += (LF_CLOCK / 2);
}
static void construct_EM410x_emul(uint64_t id) {
int i, j;
int binary[4] = {0, 0, 0, 0};
int parity[4] = {0, 0, 0, 0};
buflen = 0;
for (i = 0; i < 9; i++)
fill_buff(1);
for (i = 0; i < 10; i++) {
for (j = 3; j >= 0; j--, id /= 2)
binary[j] = id % 2;
for (j = 0; j < 4; j++)
fill_buff(binary[j]);
fill_buff(binary[0] ^ binary[1] ^ binary[2] ^ binary[3]);
for (j = 0; j < 4; j++)
parity[j] ^= binary[j];
}
for (j = 0; j < 4; j++)
fill_buff(parity[j]);
fill_buff(0);
}
#ifdef WITH_FLASH
static void SaveIDtoFlash(uint64_t id) {
uint8_t bt[5];
rdv40_spiffs_mount();
for (int i = 0; i < 5; i++) {
bt[4 - i] = (uint8_t)(id >> 8 * i & 0xff);
}
if (exists_in_spiffs(filename))
rdv40_spiffs_append(filename, &bt[0], 5, RDV40_SPIFFS_SAFETY_NORMAL);
else
rdv40_spiffs_write(filename, &bt[0], 5, RDV40_SPIFFS_SAFETY_NORMAL);
if (exists_in_spiffs(filenameLast))
rdv40_spiffs_remove(filenameLast, RDV40_SPIFFS_SAFETY_NORMAL);
rdv40_spiffs_write(filenameLast, &bt[0], 5, RDV40_SPIFFS_SAFETY_NORMAL);
}
static bool ReadFlash(void) {
if (exists_in_spiffs(filenameLast) == false)
return false;
uint8_t bt[5];
if (rdv40_spiffs_read(filenameLast, (uint8_t *) &bt, 5, RDV40_SPIFFS_SAFETY_NORMAL) < 0)
return false;
low = bt[0];
low <<= 32;
low |= (bt[1] << 24) | (bt[2] << 16) | (bt[3] << 8) | bt[4];
low2 = low;
high = 0;
high2 = 0;
return true;
}
#endif
static void Wipe(void) {
DbpString("Wipe mode");
LEDsoff();
for (;;) {
LED_A_ON();
LED_B_ON();
LED_C_ON();
LED_D_ON();
copy_em410x_to_t55xx(LF_RWSB_T55XX_TYPE, LF_CLOCK, (uint32_t) 0, (uint32_t) 0, false);
SpinDelay(60);
LEDsoff();
LED_D_ON();
int b = BUTTON_HELD(100);
if (b != BUTTON_NO_CLICK || data_available())
return;
SpinDelay(100);
b = BUTTON_HELD(100);
if (b != BUTTON_NO_CLICK || data_available())
return;
}
}
static void Read(void) {
mode = 0;
while (low2 == 0 || mode == 0) {
DbpString("Read");
LEDsoff();
LED_A_ON();
low2 = 0;
high2 = 0;
lf_em410x_watch(1, &high2, &low2, false);
if (low2 != 0) {
LED_B_ON();
low = low2;
high = high2;
mode = 1;
#ifdef WITH_FLASH
SaveIDtoFlash(low2);
#endif
SpinDelay(50);
LED_C_ON();
SpinDelay(50);
LED_D_ON();
SpinDelay(50);
LEDsoff();
return;
}
if (data_available())
return;
int b = BUTTON_CLICKED(1000);
if ((b == BUTTON_SINGLE_CLICK || b == BUTTON_HOLD) && low != 0) {
mode = 1;
return;
}
if (b == BUTTON_DOUBLE_CLICK) {
Wipe();
if (low != 0) {
mode = 1;
return;
}
}
}
}
static void Validate(void) {
DbpString("Validate");
LEDsoff();
LED_C_ON();
for (;;) {
low2 = 0;
high2 = 0;
lf_em410x_watch(1, &high2, &low2, false);
if (low == low2 && high == high2) {
LED_C_OFF();
SpinDelay(150);
for (int i = 0; i < 3; i++) {
LED_C_ON();
SpinDelay(150);
LED_C_OFF();
SpinDelay(150);
}
return;
} else if (low2 != 0 || high2 != 0) {
LEDsoff();
for (int i = 0; i < 3; i++) {
LED_A_ON();
LED_B_ON();
LED_C_ON();
LED_D_ON();
SpinDelay(250);
LEDsoff();
SpinDelay(150);
}
return;
} else
SpinDelay(200);
int b = BUTTON_HELD(200);
if (b != BUTTON_NO_CLICK || data_available())
return;
}
}
static void Write(void) {
DbpString("Write");
LED_A_ON();
LED_B_ON();
copy_em410x_to_t55xx(LF_RWSB_T55XX_TYPE, LF_CLOCK, (uint32_t)(low >> 32), (uint32_t)(low & 0xffffffff), false);
SpinDelay(75);
LEDsoff();
for (int i = 0; i < 3; i++) {
LED_A_ON();
LED_B_ON();
SpinDelay(75);
LED_A_OFF();
LED_B_OFF();
SpinDelay(75);
}
}
static void Emulate(void) {
DbpString("Emulate");
LEDsoff();
for (;;) {
int bx = BUTTON_HELD(50);
if (bx == BUTTON_NO_CLICK)
break;
SpinDelay(50);
}
LED_B_ON();
construct_EM410x_emul(rev_quads(low));
SimulateTagLowFrequencyEx(buflen, 0, false, -1);
int b = BUTTON_CLICKED(800);
if (b == BUTTON_NO_CLICK)
return;
for (;;) {
int bx = BUTTON_HELD(50);
if (bx == BUTTON_NO_CLICK)
break;
SpinDelay(50);
}
if (b == BUTTON_SINGLE_CLICK)
Write();
else if (b == BUTTON_HOLD)
mode = 0;
else if (b == BUTTON_DOUBLE_CLICK)
Validate();
}
void RunMod() {
StandAloneMode();
LEDsoff();
LED_D_ON();
FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
WDT_HIT();
#ifdef WITH_FLASH
if (ReadFlash())
mode = 1;
else Read();
#else
Read();
#endif
for (;;) {
WDT_HIT();
LEDsoff();
if (data_available()) return;
if (mode == 0)
Read();
else Emulate();
}
}
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