| 1 | //----------------------------------------------------------------------------- |
| 2 | // |
| 3 | // This code is licensed to you under the terms of the GNU GPL, version 2 or, |
| 4 | // at your option, any later version. See the LICENSE.txt file for the text of |
| 5 | // the license. |
| 6 | //----------------------------------------------------------------------------- |
| 7 | // Low frequency Paradox tag commands |
| 8 | // FSK2a, rf/50, 96 bits (completely known) |
| 9 | //----------------------------------------------------------------------------- |
| 10 | #include <stdio.h> |
| 11 | #include <string.h> |
| 12 | #include <inttypes.h> |
| 13 | #include "cmdlfparadox.h" |
| 14 | #include "proxmark3.h" |
| 15 | #include "ui.h" |
| 16 | #include "util.h" |
| 17 | #include "graph.h" |
| 18 | #include "cmdparser.h" |
| 19 | #include "cmddata.h" |
| 20 | #include "cmdlf.h" |
| 21 | #include "lfdemod.h" |
| 22 | static int CmdHelp(const char *Cmd); |
| 23 | |
| 24 | //by marshmellow |
| 25 | //Paradox Prox demod - FSK RF/50 with preamble of 00001111 (then manchester encoded) |
| 26 | //print full Paradox Prox ID and some bit format details if found |
| 27 | int CmdFSKdemodParadox(const char *Cmd) |
| 28 | { |
| 29 | //raw fsk demod no manchester decoding no start bit finding just get binary from wave |
| 30 | uint32_t hi2=0, hi=0, lo=0; |
| 31 | |
| 32 | uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0}; |
| 33 | size_t BitLen = getFromGraphBuf(BitStream); |
| 34 | if (BitLen==0) return 0; |
| 35 | int waveIdx=0; |
| 36 | //get binary from fsk wave |
| 37 | int idx = ParadoxdemodFSK(BitStream,&BitLen,&hi2,&hi,&lo,&waveIdx); |
| 38 | if (idx<0){ |
| 39 | if (g_debugMode){ |
| 40 | if (idx==-1){ |
| 41 | PrintAndLog("DEBUG: Just Noise Detected"); |
| 42 | } else if (idx == -2) { |
| 43 | PrintAndLog("DEBUG: Error demoding fsk"); |
| 44 | } else if (idx == -3) { |
| 45 | PrintAndLog("DEBUG: Preamble not found"); |
| 46 | } else if (idx == -4) { |
| 47 | PrintAndLog("DEBUG: Error in Manchester data"); |
| 48 | } else { |
| 49 | PrintAndLog("DEBUG: Error demoding fsk %d", idx); |
| 50 | } |
| 51 | } |
| 52 | return 0; |
| 53 | } |
| 54 | if (hi2==0 && hi==0 && lo==0){ |
| 55 | if (g_debugMode) PrintAndLog("DEBUG: Error - no value found"); |
| 56 | return 0; |
| 57 | } |
| 58 | uint32_t fc = ((hi & 0x3)<<6) | (lo>>26); |
| 59 | uint32_t cardnum = (lo>>10)&0xFFFF; |
| 60 | uint32_t rawLo = bytebits_to_byte(BitStream+idx+64,32); |
| 61 | uint32_t rawHi = bytebits_to_byte(BitStream+idx+32,32); |
| 62 | uint32_t rawHi2 = bytebits_to_byte(BitStream+idx,32); |
| 63 | |
| 64 | PrintAndLog("Paradox TAG ID: %x%08x - FC: %d - Card: %d - Checksum: %02x - RAW: %08x%08x%08x", |
| 65 | hi>>10, (hi & 0x3)<<26 | (lo>>10), fc, cardnum, (lo>>2) & 0xFF, rawHi2, rawHi, rawLo); |
| 66 | setDemodBuf(BitStream,BitLen,idx); |
| 67 | setClockGrid(50, waveIdx + (idx*50)); |
| 68 | if (g_debugMode){ |
| 69 | PrintAndLog("DEBUG: idx: %d, len: %d, Printing Demod Buffer:", idx, BitLen); |
| 70 | printDemodBuff(); |
| 71 | } |
| 72 | return 1; |
| 73 | } |
| 74 | //by marshmellow |
| 75 | //see ASKDemod for what args are accepted |
| 76 | int CmdParadoxRead(const char *Cmd) { |
| 77 | // read lf silently |
| 78 | lf_read(true, 10000); |
| 79 | // demod and output viking ID |
| 80 | return CmdFSKdemodParadox(Cmd); |
| 81 | } |
| 82 | |
| 83 | static command_t CommandTable[] = { |
| 84 | {"help", CmdHelp, 1, "This help"}, |
| 85 | {"demod", CmdFSKdemodParadox, 1, "Demodulate a Paradox FSK tag from the GraphBuffer"}, |
| 86 | {"read", CmdParadoxRead, 0, "Attempt to read and Extract tag data from the antenna"}, |
| 87 | {NULL, NULL, 0, NULL} |
| 88 | }; |
| 89 | |
| 90 | int CmdLFParadox(const char *Cmd) { |
| 91 | CmdsParse(CommandTable, Cmd); |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | int CmdHelp(const char *Cmd) { |
| 96 | CmdsHelp(CommandTable); |
| 97 | return 0; |
| 98 | } |