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 Presco tag commands
   8 //-----------------------------------------------------------------------------
   9
  10 #include "cmdlfvisa2000.h"
  11
  12 #define BL0CK1 0x56495332
  13
  14 static int CmdHelp(const char *Cmd);
  15
  16 int usage_lf_visa2k_clone(void){
  17         PrintAndLog("clone a Visa2000 tag to a T55x7 tag.");
  18         PrintAndLog("Usage: lf visa2k clone [h] <card ID> <Q5>");
  19         PrintAndLog("Options:");
  20         PrintAndLog("      h          : This help");
  21         PrintAndLog("      <card ID>  : Visa2k card ID");
  22         PrintAndLog("      <Q5>       : specify write to Q5 (t5555 instead of t55x7)");
  23         PrintAndLog("");
  24         PrintAndLog("Sample: lf visa2k clone 112233");
  25         return 0;
  26 }
  27
  28 int usage_lf_visa2k_sim(void) {
  29         PrintAndLog("Enables simulation of visa2k card with specified card number.");
  30         PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
  31         PrintAndLog("");
  32         PrintAndLog("Usage:  lf visa2k sim [h] <card ID>");
  33         PrintAndLog("Options:");
  34         PrintAndLog("      h          : This help");
  35         PrintAndLog("      <card ID>  : Visa2k card ID");
  36         PrintAndLog("");
  37         PrintAndLog("Sample: lf visa2k sim 112233");
  38         return 0;
  39 }
  40
  41 static uint8_t visa_chksum( uint32_t id ) {
  42     uint8_t sum = 0;
  43     for (uint8_t i = 0; i < 32; i += 4)
  44         sum ^=  (id >> i) & 0xF;
  45     return sum & 0xF;
  46 }
  47
  48 /**
  49 *
  50 * 56495332 00096ebd 00000077 —> tag id 618173
  51 * aaaaaaaa iiiiiiii -----..c
  52 *
  53 * a = fixed value  ascii 'VIS2'
  54 * i = card id
  55 * c = checksum  (xor of card id)
  56 * . = unknown
  57 *
  58 **/
  59 //see ASKDemod for what args are accepted
  60 int CmdVisa2kDemod(const char *Cmd) {
  61
  62         // save GraphBuffer - to restore it later
  63         save_restoreGB(1);
  64
  65         //sCmdAskEdgeDetect("");
  66
  67         //ASK / Manchester
  68         bool st = TRUE;
  69         if (!ASKDemod_ext("64 0 0", FALSE, FALSE, 1, &st)) {
  70                 if (g_debugMode) PrintAndLog("DEBUG: Error - Visa2k: ASK/Manchester Demod failed");
  71                 save_restoreGB(0);
  72                 return 0;
  73         }
  74         size_t size = DemodBufferLen;
  75         int ans = Visa2kDemod_AM(DemodBuffer, &size);
  76         if (ans < 0){
  77                 if (g_debugMode){
  78                         if (ans == -1)
  79                                 PrintAndLog("DEBUG: Error - Visa2k: too few bits found");
  80                         else if (ans == -2)
  81                                 PrintAndLog("DEBUG: Error - Visa2k: preamble not found");
  82                         else if (ans == -3)
  83                                 PrintAndLog("DEBUG: Error - Visa2k: Size not correct: %d", size);
  84                         else
  85                                 PrintAndLog("DEBUG: Error - Visa2k: ans: %d", ans);
  86                 }
  87                 save_restoreGB(0);
  88                 return 0;
  89         }
  90         setDemodBuf(DemodBuffer, 96, ans);
  91         setGrid_Clock(64);
  92
  93         //got a good demod
  94         uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
  95         uint32_t raw2 = bytebits_to_byte(DemodBuffer+32, 32);
  96         uint32_t raw3 = bytebits_to_byte(DemodBuffer+64, 32);
  97
  98         // chksum
  99         uint8_t calc = visa_chksum(raw2);
 100         uint8_t chk = raw3 & 0xF;
 101         // test checksums
 102         if ( chk != calc ) {
 103                 printf("DEBUG: error: Visa2000 checksum failed %x - %x\n", chk, calc);
 104                 save_restoreGB(0);
 105                 return 0;
 106         }
 107         PrintAndLog("Visa2000 Tag Found: Card ID %u,  Raw: %08X%08X%08X", raw2,  raw1 ,raw2, raw3);
 108         save_restoreGB(0);
 109         return 1;
 110 }
 111
 112 int CmdVisa2kRead(const char *Cmd) {
 113         CmdLFRead("s");
 114         getSamples("12000",TRUE);
 115         return CmdVisa2kDemod(Cmd);
 116 }
 117
 118 int CmdVisa2kClone(const char *Cmd) {
 119
 120         uint64_t id = 0;
 121         uint32_t blocks[4] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_64 | T55x7_ST_TERMINATOR | 3 << T55x7_MAXBLOCK_SHIFT, BL0CK1, 0};
 122
 123         char cmdp = param_getchar(Cmd, 0);
 124         if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_clone();
 125
 126         id = param_get32ex(Cmd, 0, 0, 10);
 127
 128         //Q5
 129         if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q') {
 130                 //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
 131                 blocks[0] = T5555_MODULATION_MANCHESTER | ((64-2)>>1) << T5555_BITRATE_SHIFT | T5555_ST_TERMINATOR | 3 << T5555_MAXBLOCK_SHIFT;
 132         }
 133
 134         //
 135         blocks[2] = id;
 136         blocks[3] = visa_chksum(id);
 137
 138         PrintAndLog("Preparing to clone Visa2000 to T55x7 with CardId: %u", id);
 139         PrintAndLog("Blk | Data ");
 140         PrintAndLog("----+------------");
 141         for(int i = 0; i<4; ++i)
 142                 PrintAndLog(" %02d | 0x%08x", i , blocks[i]);
 143
 144         UsbCommand resp;
 145         UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
 146
 147         for (int i = 3; i >= 0; --i) {
 148                 c.arg[0] = blocks[i];
 149                 c.arg[1] = i;
 150                 clearCommandBuffer();
 151                 SendCommand(&c);
 152                 if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)){
 153                         PrintAndLog("Error occurred, device did not respond during write operation.");
 154                         return -1;
 155                 }
 156         }
 157     return 0;
 158 }
 159
 160 int CmdVisa2kSim(const char *Cmd) {
 161
 162         uint32_t id = 0;
 163         char cmdp = param_getchar(Cmd, 0);
 164         if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_sim();
 165
 166         id = param_get32ex(Cmd, 0, 0, 10);
 167
 168         uint8_t clk = 64, encoding = 1, separator = 1, invert = 0;
 169         uint16_t arg1, arg2;
 170         size_t size = 96;
 171         arg1 = clk << 8 | encoding;
 172         arg2 = invert << 8 | separator;
 173
 174         PrintAndLog("Simulating Visa2000 - CardId: %u", id);
 175
 176         UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
 177
 178         uint32_t blocks[3] = { BL0CK1, id,  visa_chksum(id) };
 179
 180         for(int i=0; i<3; ++i)
 181                 num_to_bytebits(blocks[i], 32, c.d.asBytes + i*32);
 182
 183         clearCommandBuffer();
 184         SendCommand(&c);
 185         return 0;
 186 }
 187
 188 static command_t CommandTable[] = {
 189     {"help",    CmdHelp,                1, "This help"},
 190         {"read",        CmdVisa2kRead,  0, "Attempt to read and extract tag data"},
 191         {"clone",       CmdVisa2kClone, 0, "clone Visa2000 tag"},
 192         {"sim",         CmdVisa2kSim,   0, "simulate Visa2000 tag"},
 193     {NULL, NULL, 0, NULL}
 194 };
 195
 196 int CmdLFVisa2k(const char *Cmd) {
 197         clearCommandBuffer();
 198     CmdsParse(CommandTable, Cmd);
 199     return 0;
 200 }
 201
 202 int CmdHelp(const char *Cmd) {
 203     CmdsHelp(CommandTable);
 204     return 0;
 205 }