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 //see ASKDemod for what args are accepted
  49 int CmdVisa2kDemod(const char *Cmd) {
  50
  51         // save GraphBuffer - to restore it later
  52         save_restoreGB(1);
  53
  54         CmdAskEdgeDetect("");
  55
  56         //ASK / Manchester
  57         bool st = TRUE;
  58         if (!ASKDemod_ext("64 0 0", FALSE, FALSE, 1, &st)) {
  59                 if (g_debugMode) PrintAndLog("DEBUG: Error - Visa2k: ASK/Manchester Demod failed");
  60                 save_restoreGB(0);
  61                 return 0;
  62         }
  63         size_t size = DemodBufferLen;
  64         int ans = Visa2kDemod_AM(DemodBuffer, &size);
  65         if (ans < 0){
  66                 if (g_debugMode){
  67                         if (ans == -1)
  68                                 PrintAndLog("DEBUG: Error - Visa2k: too few bits found");
  69                         else if (ans == -2)
  70                                 PrintAndLog("DEBUG: Error - Visa2k: preamble not found");
  71                         else if (ans == -3)
  72                                 PrintAndLog("DEBUG: Error - Visa2k: Size not correct: %d", size);
  73                         else
  74                                 PrintAndLog("DEBUG: Error - Visa2k: ans: %d", ans);
  75                 }
  76                 save_restoreGB(0);
  77                 return 0;
  78         }
  79         setDemodBuf(DemodBuffer, 96, ans);
  80
  81         //got a good demod
  82         uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
  83         uint32_t raw2 = bytebits_to_byte(DemodBuffer+32, 32);
  84         uint32_t raw3 = bytebits_to_byte(DemodBuffer+64, 32);
  85
  86         // chksum
  87         uint8_t calc = visa_chksum(raw2);
  88         uint8_t chk = raw3 & 0xF;
  89         // test checksums
  90         if ( chk != calc ) {
  91                 printf("DEBUG: error: Visa2000 checksum failed %x - %x\n", chk, calc);
  92                 save_restoreGB(0);
  93                 return 0;
  94         }
  95         PrintAndLog("Visa2000 Tag Found: Card ID %u,  Raw: %08X%08X%08X", raw2,  raw1 ,raw2, raw3);
  96         save_restoreGB(0);
  97         return 1;
  98 }
  99
 100 int CmdVisa2kRead(const char *Cmd) {
 101         CmdLFRead("s");
 102         getSamples("20000",TRUE);
 103         return CmdVisa2kDemod(Cmd);
 104 }
 105
 106 int CmdVisa2kClone(const char *Cmd) {
 107
 108         uint64_t id = 0;
 109         uint32_t blocks[4] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_64 | T55x7_ST_TERMINATOR |3<<T55x7_MAXBLOCK_SHIFT, BL0CK1, 0};
 110
 111         char cmdp = param_getchar(Cmd, 0);
 112         if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_clone();
 113
 114         id = param_get32ex(Cmd, 0, 0, 10);
 115
 116         //Q5
 117         if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q') {
 118                 //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
 119                 blocks[0] = T5555_MODULATION_MANCHESTER | 64<<T5555_BITRATE_SHIFT | T5555_ST_TERMINATOR | 3<<T5555_MAXBLOCK_SHIFT;
 120         }
 121
 122         //
 123         blocks[2] = id;
 124         blocks[3] = visa_chksum( id);
 125
 126         PrintAndLog("Preparing to clone Visa2000 to T55x7 with CardId: %u", id);
 127         PrintAndLog("Blk | Data ");
 128         PrintAndLog("----+------------");
 129         for(int i = 0; i<4; ++i)
 130         PrintAndLog(" %02d | 0x%08x", i , blocks[i]);
 131
 132         UsbCommand resp;
 133         UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
 134
 135         for (int i = 3; i >= 0; --i) {
 136                 c.arg[0] = blocks[i];
 137                 c.arg[1] = i;
 138                 clearCommandBuffer();
 139                 SendCommand(&c);
 140                 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){
 141                         PrintAndLog("Error occurred, device did not respond during write operation.");
 142                         return -1;
 143                 }
 144         }
 145     return 0;
 146 }
 147
 148 int CmdVisa2kSim(const char *Cmd) {
 149
 150         uint32_t id = 0;
 151         char cmdp = param_getchar(Cmd, 0);
 152         if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_sim();
 153
 154         id = param_get32ex(Cmd, 0, 0, 10);
 155
 156         uint8_t clk = 64, encoding = 1, separator = 1, invert = 0;
 157         uint16_t arg1, arg2;
 158         size_t size = 96;
 159         arg1 = clk << 8 | encoding;
 160         arg2 = invert << 8 | separator;
 161
 162         PrintAndLog("Simulating Visa2000 - CardId: %u", id);
 163
 164         UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
 165
 166         uint32_t blocks[3] = { BL0CK1, id,  visa_chksum(id) };
 167
 168         for(int i=0; i<3; ++i)
 169                 num_to_bytebits(blocks[i], 32, c.d.asBytes + i*32);
 170
 171         clearCommandBuffer();
 172         SendCommand(&c);
 173         return 0;
 174 }
 175
 176 static command_t CommandTable[] = {
 177     {"help",    CmdHelp,                1, "This help"},
 178         {"read",        CmdVisa2kRead,  0, "Attempt to read and extract tag data"},
 179         {"clone",       CmdVisa2kClone, 0, "clone Visa2000 tag"},
 180         {"sim",         CmdVisa2kSim,   0, "simulate Visa2000 tag"},
 181     {NULL, NULL, 0, NULL}
 182 };
 183
 184 int CmdLFVisa2k(const char *Cmd) {
 185         clearCommandBuffer();
 186     CmdsParse(CommandTable, Cmd);
 187     return 0;
 188 }
 189
 190 int CmdHelp(const char *Cmd) {
 191     CmdsHelp(CommandTable);
 192     return 0;
 193 }