git.zerfleddert.de Git - proxmark3-svn/blob - client/cmdlfvisa2000.c

   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 visa 200 tag commands
   8 // by iceman
   9 //-----------------------------------------------------------------------------
  10
  11 #include "cmdlfvisa2000.h"
  12 #include "proxmark3.h"
  13 #include "ui.h"
  14 #include "util.h"
  15 #include "graph.h"
  16 #include "cmddata.h"    // for ASKDemod_ext, g_debugMode, DemodBuffer ...
  17 #include "cmdmain.h"    // for clearCommandBuffer and WaitForResponseTimeout
  18 #include "cmdlf.h"
  19 #include "protocols.h"  // for T55xx config register definitions
  20 #include "lfdemod.h"    // for Visa2kDemod_AM
  21
  22 #define BL0CK1 0x56495332
  23
  24 static int CmdHelp(const char *Cmd);
  25
  26 int usage_lf_visa2k_clone(void){
  27         PrintAndLog("clone a Visa2000 tag to a T55x7 tag.");
  28         PrintAndLog("Usage: lf visa2k clone [h] <card ID> <Q5>");
  29         PrintAndLog("Options:");
  30         PrintAndLog("      h          : This help");
  31         PrintAndLog("      <card ID>  : Visa2k card ID");
  32         PrintAndLog("      <Q5>       : specify write to Q5 (t5555 instead of t55x7)");
  33         PrintAndLog("");
  34         PrintAndLog("Sample: lf visa2k clone 112233");
  35         return 0;
  36 }
  37
  38 int usage_lf_visa2k_sim(void) {
  39         PrintAndLog("Enables simulation of visa2k card with specified card number.");
  40         PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
  41         PrintAndLog("");
  42         PrintAndLog("Usage:  lf visa2k sim [h] <card ID>");
  43         PrintAndLog("Options:");
  44         PrintAndLog("      h          : This help");
  45         PrintAndLog("      <card ID>  : Visa2k card ID");
  46         PrintAndLog("");
  47         PrintAndLog("Sample: lf visa2k sim 112233");
  48         return 0;
  49 }
  50
  51 static uint8_t visa_chksum( uint32_t id ) {
  52         uint8_t sum = 0;
  53         for (uint8_t i = 0; i < 32; i += 4)
  54                 sum ^=  (id >> i) & 0xF;
  55
  56         return sum;
  57 }
  58
  59 static uint8_t visa_parity( uint32_t id) {
  60         // 4bit parity LUT
  61         uint8_t par_lut[] = {
  62                  0,1,1,0
  63                 ,1,0,0,1
  64                 ,1,0,0,1
  65                 ,0,1,1,0
  66         };
  67         uint8_t par = 0;
  68         par |= par_lut[ (id >> 28) & 0xF ] << 7;
  69         par |= par_lut[ (id >> 24) & 0xF ] << 6;
  70         par |= par_lut[ (id >> 20) & 0xF ] << 5;
  71         par |= par_lut[ (id >> 16) & 0xF ] << 4;
  72         par |= par_lut[ (id >> 12) & 0xF ] << 3;
  73         par |= par_lut[ (id >>  8) & 0xF ] << 2;
  74         par |= par_lut[ (id >>  4) & 0xF ] << 1;
  75         par |= par_lut[ (id & 0xF) ];
  76         return par;
  77 }
  78
  79
  80 /**
  81 *
  82 * 56495332 00096ebd 00000077 —> tag id 618173
  83 * aaaaaaaa iiiiiiii -----..c
  84 *
  85 * a = fixed value  ascii 'VIS2'
  86 * i = card id
  87 * c = checksum  (xor of card id)
  88 * . = unknown
  89 *
  90 **/
  91 //see ASKDemod for what args are accepted
  92 int CmdVisa2kDemod(const char *Cmd) {
  93
  94         //sCmdAskEdgeDetect("");
  95
  96         //ASK / Manchester
  97         bool st = true;
  98         if (!ASKDemod_ext("64 0 0", false, false, 1, &st)) {
  99                 if (g_debugMode) PrintAndLog("DEBUG: Error - Visa2k: ASK/Manchester Demod failed");
 100                 return 0;
 101         }
 102         size_t size = DemodBufferLen;
 103         int ans = Visa2kDemod_AM(DemodBuffer, &size);
 104         if (ans < 0){
 105                 if (g_debugMode){
 106                         if (ans == -1)
 107                                 PrintAndLog("DEBUG: Error - Visa2k: too few bits found");
 108                         else if (ans == -2)
 109                                 PrintAndLog("DEBUG: Error - Visa2k: preamble not found");
 110                         else if (ans == -3)
 111                                 PrintAndLog("DEBUG: Error - Visa2k: Size not correct: %d", size);
 112                         else
 113                                 PrintAndLog("DEBUG: Error - Visa2k: ans: %d", ans);
 114                 }
 115                 return 0;
 116         }
 117         setDemodBuf(DemodBuffer, 96, ans);
 118         //setGrid_Clock(64);
 119
 120         //got a good demod
 121         uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
 122         uint32_t raw2 = bytebits_to_byte(DemodBuffer+32, 32);
 123         uint32_t raw3 = bytebits_to_byte(DemodBuffer+64, 32);
 124
 125         // chksum
 126         uint8_t calc = visa_chksum(raw2);
 127         uint8_t chk = raw3 & 0xF;
 128
 129         // test checksums
 130         if ( chk != calc ) {
 131                 printf("DEBUG: error: Visa2000 checksum failed %x - %x\n", chk, calc);
 132                 return 0;
 133         }
 134         // parity
 135         uint8_t calc_par = visa_parity(raw2);
 136         uint8_t chk_par = (raw3 & 0xFF0) >> 4;
 137         if ( calc_par != chk_par) {
 138                 printf("DEBUG: error: Visa2000 parity failed %x - %x\n", chk_par, calc_par);
 139                 return 0;
 140         }
 141         PrintAndLog("Visa2000 Tag Found: Card ID %u,  Raw: %08X%08X%08X", raw2,  raw1 ,raw2, raw3);
 142         return 1;
 143 }
 144
 145 int CmdVisa2kRead(const char *Cmd) {
 146         CmdLFRead("s");
 147         //64*96*2=12288 samples just in case we just missed the first preamble we can still catch 2 of them
 148         getSamples("12500",true);
 149         return CmdVisa2kDemod(Cmd);
 150 }
 151
 152 int CmdVisa2kClone(const char *Cmd) {
 153
 154         uint64_t id = 0;
 155         uint32_t blocks[4] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_64 | T55x7_ST_TERMINATOR | 3 << T55x7_MAXBLOCK_SHIFT, BL0CK1, 0};
 156
 157         char cmdp = param_getchar(Cmd, 0);
 158         if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_clone();
 159
 160         id = param_get32ex(Cmd, 0, 0, 10);
 161
 162         //Q5
 163         if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q') {
 164                 //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
 165                 blocks[0] = T5555_MODULATION_MANCHESTER | ((64-2)>>1) << T5555_BITRATE_SHIFT | T5555_ST_TERMINATOR | 3 << T5555_MAXBLOCK_SHIFT;
 166         }
 167
 168         blocks[2] = id;
 169         blocks[3] = (visa_parity(id) << 4) | visa_chksum(id);
 170
 171         PrintAndLog("Preparing to clone Visa2000 to T55x7 with CardId: %u", id);
 172         PrintAndLog("Blk | Data ");
 173         PrintAndLog("----+------------");
 174         for(int i = 0; i<4; ++i)
 175                 PrintAndLog(" %02d | 0x%08x", i , blocks[i]);
 176
 177         UsbCommand resp;
 178         UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
 179
 180         for (int i = 3; i >= 0; --i) {
 181                 c.arg[0] = blocks[i];
 182                 c.arg[1] = i;
 183                 clearCommandBuffer();
 184                 SendCommand(&c);
 185                 if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)){
 186                         PrintAndLog("Error occurred, device did not respond during write operation.");
 187                         return -1;
 188                 }
 189         }
 190         return 0;
 191 }
 192
 193 int CmdVisa2kSim(const char *Cmd) {
 194
 195         uint32_t id = 0;
 196         char cmdp = param_getchar(Cmd, 0);
 197         if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_sim();
 198
 199         id = param_get32ex(Cmd, 0, 0, 10);
 200
 201         uint8_t clk = 64, encoding = 1, separator = 1, invert = 0;
 202         uint16_t arg1, arg2;
 203         size_t size = 96;
 204         arg1 = clk << 8 | encoding;
 205         arg2 = invert << 8 | separator;
 206
 207         PrintAndLog("Simulating Visa2000 - CardId: %u", id);
 208
 209         UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
 210
 211         uint32_t blocks[3] = { BL0CK1, id, (visa_parity(id) << 4) | visa_chksum(id) };
 212
 213         for(int i=0; i<3; ++i)
 214                 num_to_bytebits(blocks[i], 32, c.d.asBytes + i*32);
 215
 216         clearCommandBuffer();
 217         SendCommand(&c);
 218         return 0;
 219 }
 220
 221 static command_t CommandTable[] = {
 222         {"help",  CmdHelp,        1, "This help"},
 223         {"demod", CmdVisa2kDemod, 1, "Attempt to demod from GraphBuffer"},
 224         {"read",  CmdVisa2kRead,  0, "Attempt to read and extract tag data"},
 225         {"clone", CmdVisa2kClone, 0, "clone Visa2000 tag"},
 226         {"sim",   CmdVisa2kSim,   0, "simulate Visa2000 tag"},
 227         {NULL, NULL, 0, NULL}
 228 };
 229
 230 int CmdLFVisa2k(const char *Cmd) {
 231         clearCommandBuffer();
 232         CmdsParse(CommandTable, Cmd);
 233         return 0;
 234 }
 235
 236 int CmdHelp(const char *Cmd) {
 237         CmdsHelp(CommandTable);
 238         return 0;
 239 }