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