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proxmark3/armsrc/Standalone/lf_em4100rswb.c
Philippe Teuwen 4d264fa63c Preparing EM4100 clone to EM4305
2022-04-29 16:44:38 +02:00

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//-----------------------------------------------------------------------------
// Copyright (C) 2020 Dmitriy Loginoov
// Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// See LICENSE.txt for the text of the license.
//-----------------------------------------------------------------------------
// LF rswb - This mode can simulate ID from selected slot, read ID to
// selected slot, write from selected slot to T5555/T55x7 tag and store
// read ID to flash (only RDV4).
// Predefining it is not recommended because you can incidentally rewrite your MANDATORY tag data.
//
// To recall stored ID from flash execute:
// mem spifss dump o emdump p
// or:
// mem spifss dump o emdump f emdump
// then from shell:
// hexdump emdump -e '5/1 "%02X" /0 "\n"'
//
// Mode list (switched by single click):
//
// 0 - READ Read source card ID and store it to current slot
// Will switch to SIM mode automatically.
//
// 1 - SIM Simulate read ID
//
// 2 - WRITE(CLONE) Write read ID to T55x7 card
// !!! Warning, card id WILL BE OVERWRITTEN
//
// 3 - BRUTE Brute upper or down from read card)
// You can PRESS SINGLE to exit brute mode OR
// PRESS DOUBLE to save bruted ID to current slot (will automatically switch to SIM mode) AND
// Also You can HOLD button to change brute speeds.
//
// Slots are switched by HOLD (LONG PRESS)
//-----------------------------------------------------------------------------
#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"
#endif
#define LF_CLOCK 64 // for 125kHz
#define LF_RWSB_T55XX_TYPE 1 // Tag type: 0 - T5555, 1-T55x7, 2-EM4x05
#define LF_RWSB_UNKNOWN_RESULT 0
#define LF_RWSB_BRUTE_STOPED 1
#define LF_RWSB_BRUTE_SAVED 2
//modes
#define LF_RWSB_MODE_READ 0
#define LF_RWSB_MODE_SIM 1
#define LF_RWSB_MODE_WRITE 2
#define LF_RWSB_MODE_BRUTE 3
// Predefined bruteforce speed
// avg: 1s, 1.2s, 1.5s, 2s
static int em4100rswb_bruteforceSpeedCurrent = 1;
static int em4100rswb_bruteforceSpeed[] = {10, 12, 14, 16};
// em4100rswb_low & em4100rswb_high - array for storage IDs. Its length must be equal.
// Predefined IDs must be stored in em4100rswb_low[].
// In em4100rswb_high[] must be nulls
static uint64_t em4100rswb_low[] = {0, 0, 0, 0};
static uint32_t em4100rswb_high[] = {0, 0, 0, 0};
static int em4100rswb_buflen;
void ModInfo(void) {
DbpString(" LF EM4100 read/sim/write/brute mode");
}
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 + em4100rswb_buflen, bit, LF_CLOCK / 2);
em4100rswb_buflen += (LF_CLOCK / 2);
memset(bba + em4100rswb_buflen, bit ^ 1, LF_CLOCK / 2);
em4100rswb_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};
em4100rswb_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);
}
static void LED_Update(int mode, int slot) {
LEDsoff();
switch (mode) {
case 0:
break;
case 1:
LED_A_ON();
break;
case 2:
LED_B_ON();
break;
case 3:
LED_A_ON();
LED_B_ON();
break;
}
switch (slot) {
case 0:
break;
case 1:
LED_C_ON();
break;
case 2:
LED_D_ON();
break;
case 3:
LED_C_ON();
LED_D_ON();
break;
}
}
static void FlashLEDs(uint32_t speed, uint8_t times) {
for (int i = 0; i < times * 2; i++) {
LED_A_INV();
LED_B_INV();
LED_C_INV();
LED_D_INV();
SpinDelay(speed);
}
}
#ifdef WITH_FLASH
static void SaveIDtoFlash(int addr, uint64_t id) {
uint8_t bt[5];
char *filename = "emdump";
rdv40_spiffs_mount();
for (int i = 0; i < 5; i++) {
bt[4 - i] = (uint8_t)(id >> 8 * i & 0xff);
}
if (exists_in_spiffs(filename) == false) {
rdv40_spiffs_write(filename, &bt[0], 5, RDV40_SPIFFS_SAFETY_NORMAL);
} else {
rdv40_spiffs_append(filename, &bt[0], 5, RDV40_SPIFFS_SAFETY_NORMAL);
}
}
#endif
static uint64_t PackEmID(uint64_t original, int newCardNum) {
uint64_t buf = original;
//clear pairity bits
buf &= ~(1 << 0);
buf &= ~(1 << 25);
//clear card number
for (int i = 1; i <= 16; i++) {
buf &= ~(1 << i);
}
buf |= (newCardNum & 0xFFFF) << 1;
buf |= oddparity32((buf >> 1) & 0xFFF);
buf |= (evenparity32((buf >> 13) & 0xFFF)) << 25;
uint32_t cardnumNew = (buf >> 1) & 0xFFFF;
uint32_t fcNew = (buf >> 17) & 0xFF;
Dbprintf("[=] RECONSTRUCT TAG ID: %"PRIx64" - FC: %u - Card: %u\n", buf, fcNew, cardnumNew);
return buf;
}
static void PrintFcAndCardNum(uint64_t lowData) {
// Calculate Facility Code and Card Number from high and low
uint32_t fc = (lowData >> 17) & 0xFF;
uint32_t cardnum = (lowData >> 1) & 0xFFFF;
Dbprintf("[=] READ TAG ID: %"PRIx64" - FC: %u - Card: %u", lowData, fc, cardnum);
}
static int BruteEMTag(uint64_t originalCard, int slot) {
int speed_count = 4;
int direction = 1;
uint32_t cardnum = (originalCard >> 1) & 0xFFFF;
if (cardnum > 32767) {
direction = -1;
}
while (cardnum > 1 && cardnum < 65535) {
WDT_HIT();
if (data_available()) break;
cardnum = cardnum + direction;
uint64_t currentCard = PackEmID(originalCard, cardnum);
Dbprintf("[=] >> Simulating card id %"PRIx64" <<", currentCard);
construct_EM410x_emul(rev_quads(currentCard));
SimulateTagLowFrequencyEx(em4100rswb_buflen, 0, 1, em4100rswb_bruteforceSpeed[em4100rswb_bruteforceSpeedCurrent] * 10000);
int button_pressed = BUTTON_CLICKED(1000);
if (button_pressed == BUTTON_SINGLE_CLICK) {
Dbprintf("[=] >> Exit bruteforce mode without saving. <<");
return LF_RWSB_BRUTE_STOPED;
} else if (button_pressed == BUTTON_DOUBLE_CLICK) {
FlashLEDs(100, 10);
Dbprintf("[=] >> Saving bruteforced card to current slot <<");
em4100rswb_low[slot] = currentCard;
#ifdef WITH_FLASH
SaveIDtoFlash(slot, em4100rswb_low[slot]);
#endif
return LF_RWSB_BRUTE_SAVED;
} else if (button_pressed == BUTTON_HOLD) {
FlashLEDs(100, 1);
WAIT_BUTTON_RELEASED();
em4100rswb_bruteforceSpeedCurrent = (em4100rswb_bruteforceSpeedCurrent + 1) % speed_count;
FlashLEDs(100, em4100rswb_bruteforceSpeedCurrent + 1);
Dbprintf("[=] >> Setting speed to %d (%d) <<", em4100rswb_bruteforceSpeedCurrent, em4100rswb_bruteforceSpeed[em4100rswb_bruteforceSpeedCurrent]);
}
}
return LF_RWSB_BRUTE_STOPED;
}
static int ExecuteMode(int mode, int slot) {
LED_Update(mode, slot);
WDT_HIT();
switch (mode) {
//default first mode is simulate
case LF_RWSB_MODE_READ:
Dbprintf("[=] >> Read mode started <<");
lf_em410x_watch(1, &em4100rswb_high[slot], &em4100rswb_low[slot], true);
LED_Update(mode, slot);
Dbprintf("[=] >> Tag found. Saving. <<");
FlashLEDs(100, 5);
PrintFcAndCardNum(em4100rswb_low[slot]);
#ifdef WITH_FLASH
SaveIDtoFlash(slot, em4100rswb_low[slot]);
#endif
return LF_RWSB_UNKNOWN_RESULT;
case LF_RWSB_MODE_SIM:
Dbprintf("[=] >> Sim mode started <<");
construct_EM410x_emul(rev_quads(em4100rswb_low[slot]));
SimulateTagLowFrequency(em4100rswb_buflen, 0, true);
return LF_RWSB_UNKNOWN_RESULT;
case LF_RWSB_MODE_WRITE:
Dbprintf("[!!] >> Write mode started <<");
copy_em410x_to_t55xx(LF_RWSB_T55XX_TYPE, LF_CLOCK, (uint32_t)(em4100rswb_low[slot] >> 32), (uint32_t)(em4100rswb_low[slot] & 0xffffffff), true);
return LF_RWSB_UNKNOWN_RESULT;
case LF_RWSB_MODE_BRUTE:
Dbprintf("[=] >> Bruteforce mode started <<");
return BruteEMTag(em4100rswb_low[slot], slot);
}
return LF_RWSB_UNKNOWN_RESULT;
}
static int SwitchMode(int mode, int slot) {
WDT_HIT();
ExecuteMode(mode, slot);
if (mode == LF_RWSB_MODE_READ) {
//After read mode we need to switch to sim mode automatically
Dbprintf("[=] >> automatically switch to sim mode after read <<");
return SwitchMode(LF_RWSB_MODE_SIM, slot);
} else if (mode == LF_RWSB_MODE_BRUTE) {
//We have already have a click inside brute mode. Lets switch next mode
Dbprintf("[=] >> automatically switch to read mode after brute <<");
return SwitchMode(LF_RWSB_MODE_READ, slot);
}
return mode;
}
void RunMod() {
StandAloneMode();
FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
Dbprintf("[=] >> LF EM4100 read/write/clone/brute started <<");
int slots_count = 4;
int mode_count = 4;
int mode = 0;
int slot = 0;
mode = SwitchMode(mode, slot);
for (;;) {
WDT_HIT();
if (data_available()) break;
int button_pressed = BUTTON_CLICKED(1000);
LED_Update(mode, slot);
//press button - switch mode
//hold button - switch slot
if (button_pressed == BUTTON_SINGLE_CLICK) {
Dbprintf("[=] >> Single click <<");
mode = (mode + 1) % mode_count;
SpinDown(100);
mode = SwitchMode(mode, slot);
} else if (button_pressed == BUTTON_HOLD) {
Dbprintf("[=] >> Button hold <<");
slot = (slot + 1) % slots_count;
SpinUp(100);
SpinDelay(300);
//automatically switch to SIM mode on slot selection
mode = LF_RWSB_MODE_SIM;
mode = SwitchMode(mode, slot);
}
}
}
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