git.zerfleddert.de Git - proxmark3-svn/blob - client/cmdlfpresco.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 #include <string.h>
  10 #include <inttypes.h>
  11 #include "cmdlfpresco.h"
  12 static int CmdHelp(const char *Cmd);
  13
  14 int usage_lf_presco_clone(void){
  15         PrintAndLog("clone a Presco tag to a T55x7 tag.");
  16         PrintAndLog("Usage: lf presco clone <Card ID - 9 digits> <Q5>");
  17         PrintAndLog("Options :");
  18         PrintAndLog("  <Card Number>  : 9 digit presco card number");
  19         //PrintAndLog("  <Q5>           : specify write to Q5 (t5555 instead of t55x7)");
  20         PrintAndLog("");
  21         PrintAndLog("Sample  : lf presco clone 123456789");
  22         return 0;
  23 }
  24
  25 int usage_lf_presco_sim(void) {
  26         PrintAndLog("Enables simulation of presco card with specified card number.");
  27         PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
  28         PrintAndLog("Per presco format, the card number is 9 digit number and can contain *# chars. Larger values are truncated.");
  29         PrintAndLog("");
  30         PrintAndLog("Usage:  lf presco sim <Card-Number>");
  31         PrintAndLog("Options :");
  32         PrintAndLog("  <Card Number>   : 9 digit presco card number");
  33         PrintAndLog("");
  34         PrintAndLog("Sample  : lf presco sim 123456789");
  35         return 0;
  36 }
  37
  38 // calc checksum
  39 int GetWiegandFromPresco(const char *id, uint32_t *sitecode, uint32_t *usercode) {
  40
  41         uint8_t val = 0;
  42         for (int index =0; index < strlen(id); ++index) {
  43
  44                 // Get value from number string.
  45                 if ( id[index] == '*' ) val = 10;
  46                 if ( id[index] == '#')  val = 11;
  47                 if ( id[index] >= 0x30 && id[index] <= 0x39 )
  48                         val = id[index] - 0x30;
  49
  50                 *sitecode += val;
  51
  52                 // last digit is only added, not multipled.
  53                 if ( index < strlen(id)-1 )
  54                         *sitecode *= 12;
  55         }
  56         *usercode = *sitecode % 65536;
  57         *sitecode /= 16777216;
  58         return 0;
  59 }
  60
  61 int GetPrescoBits(uint32_t sitecode, uint32_t usercode, uint8_t *prescoBits) {
  62         uint8_t pre[66];
  63         memset(pre, 0, sizeof(pre));
  64         prescoBits[7]=1;
  65         num_to_bytebits(26, 8, pre);
  66
  67         uint8_t wiegand[24];
  68         num_to_bytebits(sitecode, 8, wiegand);
  69         num_to_bytebits(usercode, 16, wiegand+8);
  70
  71         wiegand_add_parity(pre+8, wiegand, 24);
  72         size_t bitLen = addParity(pre, prescoBits+8, 66, 4, 1);
  73
  74         if (bitLen != 88) return 0;
  75         return 1;
  76 }
  77 //see ASKDemod for what args are accepted
  78 int CmdPrescoDemod(const char *Cmd) {
  79         if (!ASKDemod(Cmd, false, false, 1)) {
  80                 if (g_debugMode) PrintAndLog("ASKDemod failed");
  81                 return 0;
  82         }
  83         size_t size = DemodBufferLen;
  84         //call lfdemod.c demod for Viking
  85         int ans = PrescoDemod(DemodBuffer, &size);
  86         if (ans < 0) {
  87                 if (g_debugMode) PrintAndLog("Error Presco_Demod %d", ans);
  88                 return 0;
  89         }
  90         //got a good demod
  91         uint32_t raw1 = bytebits_to_byte(DemodBuffer+ans, 32);
  92         uint32_t raw2 = bytebits_to_byte(DemodBuffer+ans+32, 32);
  93         uint32_t cardid = bytebits_to_byte(DemodBuffer+ans+24, 32);
  94         PrintAndLog("Presco Tag Found: Card ID %08X", cardid);
  95         PrintAndLog("Raw: %08X%08X", raw1,raw2);
  96         setDemodBuf(DemodBuffer+ans, 64, 0);
  97
  98         // uint32_t sitecode = 0, usercode = 0;
  99         // GetWiegandFromPresco(id, &sitecode, &usercode);
 100         // PrintAndLog8("SiteCode %d  |  UserCode %d", sitecode, usercode);
 101
 102         return 1;
 103 }
 104
 105 //see ASKDemod for what args are accepted
 106 int CmdPrescoRead(const char *Cmd) {
 107         //      Presco Number: 123456789 --> Sitecode 30 | usercode 8665
 108
 109         // read lf silently
 110         CmdLFRead("s");
 111         // get samples silently
 112         getSamples("30000",false);
 113         // demod and output Presco ID
 114         return CmdPrescoDemod(Cmd);
 115 }
 116
 117 int CmdPrescoClone(const char *Cmd) {
 118
 119         char cmdp = param_getchar(Cmd, 0);
 120         if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_presco_clone();
 121
 122         uint32_t sitecode=0, usercode=0;
 123         uint8_t bits[96];
 124         uint8_t *bs = bits;
 125         memset(bs,0,sizeof(bits));
 126         uint32_t blocks[5] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_32 | 4<<T55x7_MAXBLOCK_SHIFT | T55x7_ST_TERMINATOR, 0, 0, 0, 5};
 127
 128         if (param_getchar(Cmd, 3) == 'Q' || param_getchar(Cmd, 3) == 'q')
 129                 blocks[0] = T5555_MODULATION_MANCHESTER | 32<<T5555_BITRATE_SHIFT | 4<<T5555_MAXBLOCK_SHIFT | T5555_ST_TERMINATOR;
 130
 131         // get wiegand from printed number.
 132         GetWiegandFromPresco(Cmd, &sitecode, &usercode);
 133
 134         if ((sitecode & 0xFF) != sitecode) {
 135                 sitecode &= 0xFF;
 136                 PrintAndLog("Facility-Code Truncated to 8-bits (Presco): %u", sitecode);
 137         }
 138
 139         if ((usercode & 0xFFFF) != usercode) {
 140                 usercode &= 0xFFFF;
 141                 PrintAndLog("Card Number Truncated to 16-bits (Presco): %u", usercode);
 142         }
 143
 144         if ( !GetPrescoBits(sitecode, usercode, bs)) {
 145                 PrintAndLog("Error with tag bitstream generation.");
 146                 return 1;
 147         }
 148
 149         blocks[1] = bytebits_to_byte(bs,32);
 150         blocks[2] = bytebits_to_byte(bs+32,32);
 151         blocks[3] = bytebits_to_byte(bs+64,32);
 152         blocks[4] = bytebits_to_byte(bs+96,32);
 153
 154         PrintAndLog("Preparing to clone Presco to T55x7 with SiteCode: %u, UserCode: %u", sitecode, usercode);
 155         PrintAndLog("Blk | Data ");
 156         PrintAndLog("----+------------");
 157         PrintAndLog(" 00 | 0x%08x", blocks[0]);
 158         PrintAndLog(" 01 | 0x%08x", blocks[1]);
 159         PrintAndLog(" 02 | 0x%08x", blocks[2]);
 160         PrintAndLog(" 03 | 0x%08x", blocks[3]);
 161         PrintAndLog(" 04 | 0x%08x", blocks[4]);
 162
 163         // UsbCommand resp;
 164         // UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
 165
 166         // for (uint8_t i=0; i<5; i++) {
 167                 // c.arg[0] = blocks[i];
 168                 // c.arg[1] = i;
 169                 // clearCommandBuffer();
 170                 // SendCommand(&c);
 171                 // if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){
 172                         // PrintAndLog("Error occurred, device did not respond during write operation.");
 173                         // return -1;
 174                 // }
 175         // }
 176     return 0;
 177 }
 178
 179 int CmdPrescoSim(const char *Cmd) {
 180         // uint32_t id = 0;
 181         // uint64_t rawID = 0;
 182         // uint8_t clk = 32, encoding = 1, separator = 0, invert = 0;
 183
 184         // char cmdp = param_getchar(Cmd, 0);
 185         // if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_presco_sim();
 186
 187         // id = param_get32ex(Cmd, 0, 0, 16);
 188         // if (id == 0) return usage_lf_presco_sim();
 189
 190         //rawID = getVikingBits(id);
 191
 192         // uint16_t arg1, arg2;
 193         // size_t size = 64;
 194         // arg1 = clk << 8 | encoding;
 195         // arg2 = invert << 8 | separator;
 196
 197         // PrintAndLog("Simulating - ID: %08X, Raw: %08X%08X",id,(uint32_t)(rawID >> 32),(uint32_t) (rawID & 0xFFFFFFFF));
 198
 199         // UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
 200         // num_to_bytebits(rawID, size, c.d.asBytes);
 201         // clearCommandBuffer();
 202         // SendCommand(&c);
 203         return 0;
 204 }
 205
 206 static command_t CommandTable[] = {
 207     {"help",    CmdHelp,                1, "This help"},
 208         {"read",        CmdPrescoRead,  0, "Attempt to read and Extract tag data"},
 209         {"clone",       CmdPrescoClone, 0, "<8 digit ID number> clone presco tag"},
 210 //      {"sim",         CmdPrescoSim,   0, "<8 digit ID number> simulate presco tag"},
 211     {NULL, NULL, 0, NULL}
 212 };
 213
 214 int CmdLFPresco(const char *Cmd) {
 215         clearCommandBuffer();
 216     CmdsParse(CommandTable, Cmd);
 217     return 0;
 218 }
 219
 220 int CmdHelp(const char *Cmd) {
 221     CmdsHelp(CommandTable);
 222     return 0;
 223 }