mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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116 lines
3.5 KiB
C
116 lines
3.5 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) Artyom Gnatyuk, 2020
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// Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// See LICENSE.txt for the text of the license.
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//-----------------------------------------------------------------------------
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// LF emul - Very simple mode. Simulate only predefined in low[] IDs
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// Short click - select next slot and start simulation
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//-----------------------------------------------------------------------------
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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 "fpgaloader.h"
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#include "lfops.h"
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#include "util.h"
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#include "dbprint.h"
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#include "ticks.h"
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#include "string.h"
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#include "BigBuf.h"
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#include "commonutil.h"
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#define MAX_IND 16 // 4 LEDs - 2^4 combinations
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#define LF_CLOCK 64 // for 125kHz
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// Predefined IDs must be stored in em4100emul_low[].
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static uint64_t em4100emul_low[] = {0x565A1140BE, 0x365A398149, 0x5555555555, 0xFFFFFFFFFF};
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static uint8_t em4100emul_slots_count;
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static int em4100emul_buflen;
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void ModInfo(void) {
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DbpString(" LF EM4100 simulator standalone mode");
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}
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static uint64_t rev_quads(uint64_t bits) {
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uint64_t result = 0;
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for (int i = 0; i < 16; i++) {
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result += ((bits >> (60 - 4 * i)) & 0xf) << (4 * i);
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}
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return result >> 24;
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}
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static void fill_buff(uint8_t bit) {
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uint8_t *bba = BigBuf_get_addr();
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memset(bba + em4100emul_buflen, bit, LF_CLOCK / 2);
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em4100emul_buflen += (LF_CLOCK / 2);
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memset(bba + em4100emul_buflen, bit ^ 1, LF_CLOCK / 2);
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em4100emul_buflen += (LF_CLOCK / 2);
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}
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static void construct_EM410x_emul(uint64_t id) {
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int i, j;
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int binary[4] = {0, 0, 0, 0};
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int parity[4] = {0, 0, 0, 0};
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em4100emul_buflen = 0;
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for (i = 0; i < 9; i++)
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fill_buff(1);
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for (i = 0; i < 10; i++) {
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for (j = 3; j >= 0; j--, id /= 2)
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binary[j] = id % 2;
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for (j = 0; j < 4; j++)
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fill_buff(binary[j]);
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fill_buff(binary[0] ^ binary[1] ^ binary[2] ^ binary[3]);
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for (j = 0; j < 4; j++)
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parity[j] ^= binary[j];
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}
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for (j = 0; j < 4; j++)
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fill_buff(parity[j]);
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fill_buff(0);
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}
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static void LED_Slot(int i) {
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LEDsoff();
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if (em4100emul_slots_count > 4) {
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LED(i % MAX_IND, 0); //binary indication for em4100emul_slots_count > 4
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} else {
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LED(1 << i, 0); //simple indication for em4100emul_slots_count <=4
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}
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}
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void RunMod(void) {
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StandAloneMode();
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FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
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Dbprintf("[=] >> LF EM4100 simulator started <<");
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int selected = 0; //selected slot after start
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em4100emul_slots_count = ARRAYLEN(em4100emul_low);
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for (;;) {
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WDT_HIT();
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if (data_available()) break;
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SpinDelay(100);
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SpinUp(100);
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LED_Slot(selected);
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construct_EM410x_emul(rev_quads(em4100emul_low[selected]));
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SimulateTagLowFrequency(em4100emul_buflen, 0, true);
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selected = (selected + 1) % em4100emul_slots_count;
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}
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}
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