mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-11-15 22:29:52 +08:00
204 lines
6.5 KiB
C
204 lines
6.5 KiB
C
//-----------------------------------------------------------------------------
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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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// Low frequency Paradox tag commands
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// FSK2a, rf/50, 96 bits (completely known)
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//-----------------------------------------------------------------------------
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include "cmdlfparadox.h"
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#include "proxmark3.h"
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#include "ui.h"
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#include "util.h"
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#include "graph.h"
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#include "cmdparser.h"
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#include "cmddata.h"
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#include "cmdlf.h"
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#include "lfdemod.h"
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static int CmdHelp(const char *Cmd);
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int usage_lf_paradox_sim(void) {
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PrintAndLogEx(NORMAL, "Enables simulation of Paradox card with specified card number.");
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PrintAndLogEx(NORMAL, "Simulation runs until the button is pressed or another USB command is issued.");
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PrintAndLogEx(NORMAL, "The facility-code is 8-bit and the card number is 16-bit. Larger values are truncated.");
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PrintAndLogEx(NORMAL, "");
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PrintAndLogEx(NORMAL, "Usage: lf paradox sim [h] <Facility-Code> <Card-Number>");
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PrintAndLogEx(NORMAL, "Options:");
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PrintAndLogEx(NORMAL, " h : this help");
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PrintAndLogEx(NORMAL, " <Facility-Code> : 8-bit value facility code");
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PrintAndLogEx(NORMAL, " <Card Number> : 16-bit value card number");
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PrintAndLogEx(NORMAL, "");
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PrintAndLogEx(NORMAL, "Examples:");
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PrintAndLogEx(NORMAL, " lf paradox sim 123 11223");
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return 0;
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}
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// loop to get raw paradox waveform then FSK demodulate the TAG ID from it
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int detectParadox(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo, int *waveStartIdx) {
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//make sure buffer has data
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if (*size < 96*50) return -1;
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signal_t *sp = getSignalProperties();
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if (sp->isnoise) return -2;
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// FSK demodulator
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*size = fskdemod(dest, *size, 50, 1, 10, 8, waveStartIdx); // paradox fsk2a
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//did we get a good demod?
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if (*size < 96) return -3;
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// 00001111 bit pattern represent start of frame, 01 pattern represents a 0 and 10 represents a 1
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size_t startIdx = 0;
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uint8_t preamble[] = {0,0,0,0,1,1,1,1};
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if (preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
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return -4; //preamble not found
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size_t numStart = startIdx + sizeof(preamble);
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// final loop, go over previously decoded FSK data and manchester decode into usable tag ID
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for (size_t idx = numStart; (idx-numStart) < *size - sizeof(preamble); idx+=2){
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if (dest[idx] == dest[idx+1])
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return -5; //not manchester data
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*hi2 = (*hi2 << 1) | (*hi >> 31);
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*hi = (*hi << 1) | (*lo >> 31);
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//Then, shift in a 0 or one into low
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*lo <<= 1;
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if (dest[idx] && !dest[idx+1]) // 1 0
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*lo |= 1;
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else // 0 1
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*lo |= 0;
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}
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return (int)startIdx;
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}
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//by marshmellow
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//Paradox Prox demod - FSK2a RF/50 with preamble of 00001111 (then manchester encoded)
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//print full Paradox Prox ID and some bit format details if found
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int CmdParadoxDemod(const char *Cmd) {
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//raw fsk demod no manchester decoding no start bit finding just get binary from wave
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uint8_t bits[MAX_GRAPH_TRACE_LEN]={0};
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size_t size = getFromGraphBuf(bits);
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if (size == 0) {
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PrintAndLogEx(DEBUG, "DEBUG: Error - Paradox not enough samples");
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return 0;
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}
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uint32_t hi2=0, hi=0, lo=0;
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int waveIdx=0;
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//get binary from fsk wave
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int idx = detectParadox(bits, &size, &hi2, &hi, &lo, &waveIdx);
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if (idx < 0){
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if (idx == -1)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Paradox not enough samples");
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else if (idx == -2)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Paradox just noise detected");
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else if (idx == -3)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Paradox problem during FSK demod");
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else if (idx == -4)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Paradox preamble not found");
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else if (idx == -5)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Paradox error in Manchester data, size %d", size);
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else
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PrintAndLogEx(DEBUG, "DEBUG: Error - Paradox error demoding fsk %d", idx);
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return 0;
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}
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setDemodBuf(bits, size, idx);
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setClockGrid(50, waveIdx + (idx*50));
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if (hi2==0 && hi==0 && lo==0){
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if (g_debugMode) PrintAndLogEx(DEBUG, "DEBUG: Error - Paradox no value found");
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return 0;
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}
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uint32_t fc = ((hi & 0x3)<<6) | (lo>>26);
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uint32_t cardnum = (lo>>10) & 0xFFFF;
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uint32_t rawLo = bytebits_to_byte(bits + idx + 64, 32);
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uint32_t rawHi = bytebits_to_byte(bits + idx + 32, 32);
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uint32_t rawHi2 = bytebits_to_byte(bits + idx, 32);
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PrintAndLogEx(NORMAL, "Paradox TAG ID: %x%08x - FC: %d - Card: %d - Checksum: %02x - RAW: %08x%08x%08x",
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hi >> 10,
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(hi & 0x3)<<26 | (lo>>10),
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fc, cardnum,
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(lo>>2) & 0xFF,
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rawHi2,
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rawHi,
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rawLo
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);
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PrintAndLogEx(DEBUG, "DEBUG: Paradox idx: %d, len: %d, Printing Demod Buffer:", idx, size);
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if (g_debugMode)
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printDemodBuff();
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return 1;
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}
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//by marshmellow
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//see ASKDemod for what args are accepted
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int CmdParadoxRead(const char *Cmd) {
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lf_read(true, 10000);
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return CmdParadoxDemod(Cmd);
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}
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int CmdParadoxSim(const char *Cmd) {
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char cmdp = param_getchar(Cmd, 0);
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if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_paradox_sim();
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uint32_t facilitycode = 0, cardnumber = 0, fc = 0, cn = 0;
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uint8_t bs[96];
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size_t size = sizeof(bs);
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memset(bs, 0x00, size);
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// Paradox uses: fcHigh: 10, fcLow: 8, clk: 50, invert: 1 FSK2a
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uint8_t clk = 50, invert = 1, high = 10, low = 8;
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uint16_t arg1, arg2;
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arg1 = high << 8 | low;
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arg2 = invert << 8 | clk;
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if (sscanf(Cmd, "%u %u", &fc, &cn ) != 2) return usage_lf_paradox_sim();
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facilitycode = (fc & 0x000000FF);
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cardnumber = (cn & 0x0000FFFF);
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// if ( !GetParadoxBits(facilitycode, cardnumber, bs)) {
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// PrintAndLogEx(WARNING, "Error with tag bitstream generation.");
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// return 1;
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// }
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PrintAndLogEx(NORMAL, "Simulating Paradox - Facility Code: %u, CardNumber: %u", facilitycode, cardnumber );
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UsbCommand c = {CMD_FSK_SIM_TAG, {arg1, arg2, size}};
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memcpy(c.d.asBytes, bs, size);
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clearCommandBuffer();
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SendCommand(&c);
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PrintAndLogEx(NORMAL, "UNFINISHED");
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return 0;
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}
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static command_t CommandTable[] = {
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{"help", CmdHelp, 1, "This help"},
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{"demod", CmdParadoxDemod, 1, "Demodulate a Paradox FSK tag from the GraphBuffer"},
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{"read", CmdParadoxRead, 0, "Attempt to read and Extract tag data from the antenna"},
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// {"clone", CmdParadoxClone,0, "clone paradox tag"},
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{"sim", CmdParadoxSim, 0, "simulate paradox tag"},
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{NULL, NULL, 0, NULL}
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};
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int CmdLFParadox(const char *Cmd) {
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CmdsParse(CommandTable, Cmd);
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return 0;
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}
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int CmdHelp(const char *Cmd) {
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CmdsHelp(CommandTable);
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return 0;
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}
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