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359 lines
12 KiB
C
359 lines
12 KiB
C
//-----------------------------------------------------------------------------
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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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// Low frequency Jablotron tag commands
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// Differential Biphase, RF/64, 64 bits long (complete)
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//-----------------------------------------------------------------------------
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#include "cmdlfjablotron.h"
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#include <string.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "cmdparser.h" // command_t
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#include "comms.h"
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#include "commonutil.h" // ARRAYLEN
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#include "ui.h"
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#include "cmddata.h"
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#include "cmdlf.h"
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#include "protocols.h" // for T55xx config register definitions
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#include "lfdemod.h" // parityTest
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#include "cmdlft55xx.h" // verifywrite
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#include "cliparser.h"
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#include "cmdlfem4x05.h" // EM defines
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#define JABLOTRON_ARR_LEN 64
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static int CmdHelp(const char *Cmd);
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static uint8_t jablontron_chksum(uint8_t *bits) {
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uint8_t chksum = 0;
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for (int i = 16; i < 56; i += 8) {
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chksum += bytebits_to_byte(bits + i, 8);
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}
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chksum ^= 0x3A;
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return chksum;
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}
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static uint64_t getJablontronCardId(uint64_t rawcode) {
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uint64_t id = 0;
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uint8_t bytes[] = {0, 0, 0, 0, 0};
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num_to_bytes(rawcode, 5, bytes);
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for (int i = 0; i < 5; i++) {
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id *= 100;
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id += NIBBLE_HIGH(bytes[i]) * 10 + NIBBLE_LOW(bytes[i]);
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}
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return id;
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}
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int demodJablotron(bool verbose) {
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(void) verbose; // unused so far
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//Differential Biphase / di-phase (inverted biphase)
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//get binary from ask wave
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if (ASKbiphaseDemod(0, 64, 1, 0, false) != PM3_SUCCESS) {
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if (g_debugMode) PrintAndLogEx(DEBUG, "DEBUG: Error - Jablotron ASKbiphaseDemod failed");
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return PM3_ESOFT;
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}
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size_t size = g_DemodBufferLen;
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int ans = detectJablotron(g_DemodBuffer, &size);
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if (ans < 0) {
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if (g_debugMode) {
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if (ans == -1)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Jablotron too few bits found");
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else if (ans == -2)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Jablotron preamble not found");
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else if (ans == -3)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Jablotron size not correct: %zu", size);
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else if (ans == -5)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Jablotron checksum failed");
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else
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PrintAndLogEx(DEBUG, "DEBUG: Error - Jablotron ans: %d", ans);
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}
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return PM3_ESOFT;
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}
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setDemodBuff(g_DemodBuffer, JABLOTRON_ARR_LEN, ans);
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setClockGrid(g_DemodClock, g_DemodStartIdx + (ans * g_DemodClock));
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//got a good demod
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uint32_t raw1 = bytebits_to_byte(g_DemodBuffer, 32);
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uint32_t raw2 = bytebits_to_byte(g_DemodBuffer + 32, 32);
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// bytebits_to_byte - uint32_t
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uint64_t rawid = ((uint64_t)(bytebits_to_byte(g_DemodBuffer + 16, 8) & 0xff) << 32) | bytebits_to_byte(g_DemodBuffer + 24, 32);
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uint64_t id = getJablontronCardId(rawid);
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PrintAndLogEx(SUCCESS, "Jablotron - Card: " _GREEN_("%"PRIx64) ", Raw: %08X%08X", id, raw1, raw2);
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uint8_t chksum = raw2 & 0xFF;
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bool isok = (chksum == jablontron_chksum(g_DemodBuffer));
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PrintAndLogEx(DEBUG, "Checksum: %02X ( %s )", chksum, isok ? _GREEN_("ok") : _RED_("Fail"));
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id = DEC2BCD(id);
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// Printed format: 1410-nn-nnnn-nnnn
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PrintAndLogEx(SUCCESS, "Printed: " _GREEN_("1410-%02X-%04X-%04X"),
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(uint8_t)(id >> 32) & 0xFF,
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(uint16_t)(id >> 16) & 0xFFFF,
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(uint16_t)id & 0xFFFF
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);
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return PM3_SUCCESS;
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}
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//see ASKDemod for what args are accepted
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static int CmdJablotronDemod(const char *Cmd) {
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CLIParserContext *ctx;
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CLIParserInit(&ctx, "lf jablotron demod",
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"Try to find Jablotron preamble, if found decode / descramble data",
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"lf jablotron demod\n"
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);
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void *argtable[] = {
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arg_param_begin,
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arg_param_end
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};
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CLIExecWithReturn(ctx, Cmd, argtable, true);
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CLIParserFree(ctx);
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return demodJablotron(true);
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}
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static int CmdJablotronReader(const char *Cmd) {
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CLIParserContext *ctx;
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CLIParserInit(&ctx, "lf jablotron reader",
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"read a jablotron tag",
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"lf jablotron reader -@ -> continuous reader mode"
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);
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void *argtable[] = {
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arg_param_begin,
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arg_lit0("@", NULL, "optional - continuous reader mode"),
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arg_param_end
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};
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CLIExecWithReturn(ctx, Cmd, argtable, true);
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bool cm = arg_get_lit(ctx, 1);
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CLIParserFree(ctx);
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if (cm) {
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PrintAndLogEx(INFO, "Press " _GREEN_("<Enter>") " to exit");
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}
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do {
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lf_read(false, 16000);
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demodJablotron(!cm);
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} while (cm && !kbd_enter_pressed());
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return PM3_SUCCESS;
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}
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static int CmdJablotronClone(const char *Cmd) {
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CLIParserContext *ctx;
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CLIParserInit(&ctx, "lf jablotron clone",
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"clone a Jablotron tag to a T55x7, Q5/T5555 or EM4305/4469 tag.\n"
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"Tag must be on the antenna when issuing this command.",
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"lf jablotron clone --cn 01b669 -> encode for T55x7 tag\n"
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"lf jablotron clone --cn 01b669 --q5 -> encode for Q5/T5555 tag\n"
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"lf jablotron clone --cn 01b669 --em -> encode for EM4305/4469"
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);
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void *argtable[] = {
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arg_param_begin,
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arg_str1(NULL, "cn", "<hex>", "Jablotron card ID - 5 bytes max"),
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arg_lit0(NULL, "q5", "optional - specify writing to Q5/T5555 tag"),
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arg_lit0(NULL, "em", "optional - specify writing to EM4305/4469 tag"),
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arg_param_end
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};
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CLIExecWithReturn(ctx, Cmd, argtable, false);
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int raw_len = 0;
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uint8_t raw[5] = {0};
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CLIGetHexWithReturn(ctx, 1, raw, &raw_len);
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bool q5 = arg_get_lit(ctx, 2);
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bool em = arg_get_lit(ctx, 3);
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CLIParserFree(ctx);
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if (q5 && em) {
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PrintAndLogEx(FAILED, "Can't specify both Q5 and EM4305 at the same time");
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return PM3_EINVARG;
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}
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uint32_t blocks[3] = {T55x7_MODULATION_DIPHASE | T55x7_BITRATE_RF_64 | 2 << T55x7_MAXBLOCK_SHIFT, 0, 0};
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char cardtype[16] = {"T55x7"};
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// Q5
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if (q5) {
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blocks[0] = T5555_FIXED | T5555_MODULATION_BIPHASE | T5555_INVERT_OUTPUT | T5555_SET_BITRATE(64) | 2 << T5555_MAXBLOCK_SHIFT;
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snprintf(cardtype, sizeof(cardtype), "Q5/T5555");
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}
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// EM4305
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if (em) {
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blocks[0] = EM4305_JABLOTRON_CONFIG_BLOCK;
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snprintf(cardtype, sizeof(cardtype), "EM4305/4469");
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}
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uint64_t fullcode = bytes_to_num(raw, raw_len);
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// clearing the topbit needed for the preambl detection.
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if ((fullcode & 0x7FFFFFFFFF) != fullcode) {
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fullcode &= 0x7FFFFFFFFF;
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PrintAndLogEx(INFO, "Card Number Truncated to 39bits: %"PRIx64, fullcode);
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}
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uint8_t *bits = calloc(JABLOTRON_ARR_LEN, sizeof(uint8_t));
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if (bits == NULL) {
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PrintAndLogEx(WARNING, "Failed to allocate memory");
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return PM3_EMALLOC;
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}
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if (getJablotronBits(fullcode, bits) != PM3_SUCCESS) {
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PrintAndLogEx(ERR, "Error with tag bitstream generation.");
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return PM3_ESOFT;
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}
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blocks[1] = bytebits_to_byte(bits, 32);
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blocks[2] = bytebits_to_byte(bits + 32, 32);
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free(bits);
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uint64_t id = getJablontronCardId(fullcode);
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PrintAndLogEx(INFO, "Preparing to clone Jablotron to " _YELLOW_("%s") " with FullCode: " _GREEN_("%"PRIx64)" id: " _GREEN_("%"PRIx64), cardtype, fullcode, id);
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print_blocks(blocks, ARRAYLEN(blocks));
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int res;
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if (em) {
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res = em4x05_clone_tag(blocks, ARRAYLEN(blocks), 0, false);
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} else {
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res = clone_t55xx_tag(blocks, ARRAYLEN(blocks));
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}
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PrintAndLogEx(SUCCESS, "Done");
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PrintAndLogEx(HINT, "Hint: try " _YELLOW_("`lf jablotron reader`") " to verify");
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return res;
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}
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static int CmdJablotronSim(const char *Cmd) {
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CLIParserContext *ctx;
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CLIParserInit(&ctx, "lf jablotron sim",
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"Enables simulation of jablotron card with specified card number.\n"
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"Simulation runs until the button is pressed or another USB command is issued.",
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"lf jablotron sim --cn 01b669"
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);
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void *argtable[] = {
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arg_param_begin,
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arg_str1(NULL, "cn", "<hex>", "Jablotron card ID - 5 bytes max"),
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arg_param_end
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};
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CLIExecWithReturn(ctx, Cmd, argtable, false);
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int raw_len = 0;
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uint8_t raw[5] = {0};
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CLIGetHexWithReturn(ctx, 1, raw, &raw_len);
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CLIParserFree(ctx);
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uint64_t fullcode = bytes_to_num(raw, raw_len);
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// clearing the topbit needed for the preambl detection.
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if ((fullcode & 0x7FFFFFFFFF) != fullcode) {
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fullcode &= 0x7FFFFFFFFF;
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PrintAndLogEx(INFO, "Card Number Truncated to 39bits: %"PRIx64, fullcode);
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}
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PrintAndLogEx(SUCCESS, "Simulating Jablotron - FullCode: " _YELLOW_("%"PRIx64), fullcode);
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uint8_t *bs = calloc(JABLOTRON_ARR_LEN, sizeof(uint8_t));
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if (bs == NULL) {
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PrintAndLogEx(WARNING, "Failed to allocate memory");
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return PM3_EMALLOC;
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}
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getJablotronBits(fullcode, bs);
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lf_asksim_t *payload = calloc(1, sizeof(lf_asksim_t) + JABLOTRON_ARR_LEN);
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payload->encoding = 2;
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payload->invert = 1;
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payload->separator = 0;
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payload->clock = 64;
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memcpy(payload->data, bs, JABLOTRON_ARR_LEN);
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free(bs);
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clearCommandBuffer();
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SendCommandNG(CMD_LF_ASK_SIMULATE, (uint8_t *)payload, sizeof(lf_asksim_t) + JABLOTRON_ARR_LEN);
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free(payload);
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PacketResponseNG resp;
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WaitForResponse(CMD_LF_ASK_SIMULATE, &resp);
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PrintAndLogEx(INFO, "Done");
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if (resp.status != PM3_EOPABORTED)
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return resp.status;
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return PM3_SUCCESS;
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}
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static command_t CommandTable[] = {
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{"help", CmdHelp, AlwaysAvailable, "This help"},
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{"demod", CmdJablotronDemod, AlwaysAvailable, "demodulate an Jablotron tag from the GraphBuffer"},
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{"reader", CmdJablotronReader, IfPm3Lf, "attempt to read and extract tag data"},
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{"clone", CmdJablotronClone, IfPm3Lf, "clone jablotron tag to T55x7 or Q5/T5555"},
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{"sim", CmdJablotronSim, IfPm3Lf, "simulate jablotron tag"},
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{NULL, NULL, NULL, NULL}
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};
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static int CmdHelp(const char *Cmd) {
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(void)Cmd; // Cmd is not used so far
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CmdsHelp(CommandTable);
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return PM3_SUCCESS;
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}
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int CmdLFJablotron(const char *Cmd) {
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clearCommandBuffer();
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return CmdsParse(CommandTable, Cmd);
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}
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int getJablotronBits(uint64_t fullcode, uint8_t *bits) {
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//preamp
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num_to_bytebits(0xFFFF, 16, bits);
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//fullcode
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num_to_bytebits(fullcode, 40, bits + 16);
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//chksum byte
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uint8_t chksum = jablontron_chksum(bits);
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num_to_bytebits(chksum, 8, bits + 56);
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return PM3_SUCCESS;
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}
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// ASK/Diphase fc/64 (inverted Biphase)
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// Note: this is not a demod, this is only a detection
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// the parameter *bits needs to be demoded before call
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// 0xFFFF preamble, 64bits
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int detectJablotron(uint8_t *bits, size_t *size) {
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if (*size < JABLOTRON_ARR_LEN * 2) return -1; //make sure buffer has enough data
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size_t startIdx = 0;
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uint8_t preamble[] = {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0};
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if (preambleSearch(bits, preamble, sizeof(preamble), size, &startIdx) == 0)
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return -2; //preamble not found
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if (*size != JABLOTRON_ARR_LEN) return -3; // wrong demoded size
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uint8_t checkchksum = jablontron_chksum(bits + startIdx);
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uint8_t crc = bytebits_to_byte(bits + startIdx + 56, 8);
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if (checkchksum != crc) return -5;
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return (int)startIdx;
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}
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