git.zerfleddert.de Git - proxmark3-svn/blob - client/cmdlfnedap.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 NEDAP tag commands
   8 //-----------------------------------------------------------------------------
   9 #include <string.h>
  10 #include <inttypes.h>
  11 #include "cmdlfnedap.h"
  12 static int CmdHelp(const char *Cmd);
  13
  14 int usage_lf_nedap_clone(void){
  15         PrintAndLog("clone a NEDAP tag to a T55x7 tag.");
  16         PrintAndLog("");
  17         PrintAndLog("Usage: lf nedap clone <Card-Number>");
  18         PrintAndLog("Options :");
  19         PrintAndLog("  <Card Number>   : 24-bit value card number");
  20 //      PrintAndLog("  Q5              : optional - clone to Q5 (T5555) instead of T55x7 chip");
  21         PrintAndLog("");
  22         PrintAndLog("Sample  : lf nedap clone 112233");
  23         return 0;
  24 }
  25
  26 int usage_lf_nedap_sim(void) {
  27         PrintAndLog("Enables simulation of NEDAP card with specified card number.");
  28         PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
  29         PrintAndLog("");
  30         PrintAndLog("Usage:  lf nedap sim <Card-Number>");
  31         PrintAndLog("Options :");
  32         PrintAndLog("  <Card Number>   : 24-bit value card number");
  33         PrintAndLog("");
  34         PrintAndLog("Sample  : lf nedap sim 112233");
  35         return 0;
  36 }
  37
  38 int GetNedapBits(uint32_t cn, uint8_t *nedapBits) {
  39
  40         uint8_t pre[128];
  41         memset(pre, 0x00, sizeof(pre));
  42
  43         // preamble  1111 1111 10 = 0XF8
  44         num_to_bytebits(0xF8, 10, pre);
  45
  46         // fixed tagtype code?  0010 1101 = 0x2D
  47         num_to_bytebits(0x2D, 8, pre+10);
  48
  49         // 46 encrypted bits - UNKNOWN ALGO
  50         //    -- 16 bits checksum. Should be 4x4 checksum,  based on UID and 2 constant values.
  51         //    -- 30 bits undocumented?
  52         num_to_bytebits(cn, 46, pre+18);
  53
  54         //----from this part, the UID in clear text, with a 1bit ZERO as separator between bytes.
  55         pre[64] = 0;
  56
  57         // cardnumber
  58         num_to_bytebits(cn, 24, pre+64);
  59
  60         pre[73] = 0;
  61         pre[82] = 0;
  62         pre[91] = 0;
  63         pre[100] = 0;
  64         pre[109] = 0;
  65         pre[118] = 0;
  66
  67         // add paritybits       (bitsource, dest, sourcelen, paritylen, parityType (odd, even,)
  68         addParity(pre+64, pre+64, 128, 8, 1);
  69
  70 //1111111110001011010000010110100011001001000010110101001101011001000110011010010000000000100001110001001000000001000101011100111
  71         return 1;
  72 }
  73
  74 //GetParity( uint8_t *bits, uint8_t type, int length)
  75
  76 //NEDAP demod - ASK/Biphase,  RF/64 with preamble of 1111111110  (always a 128 bit data stream)
  77 //print NEDAP Prox ID, encoding, encrypted ID,
  78
  79 int CmdLFNedapDemod(const char *Cmd) {
  80         //raw ask demod no start bit finding just get binary from wave
  81         uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
  82         size_t size = getFromGraphBuf(BitStream);
  83         if (size==0) return 0;
  84
  85         //get binary from ask wave
  86         if (!ASKbiphaseDemod("0 64 0 0", FALSE)) {
  87                 if (g_debugMode) PrintAndLog("Error NEDAP: ASKbiphaseDemod failed");
  88                 return 0;
  89         }
  90         size = DemodBufferLen;
  91         int idx = NedapDemod(DemodBuffer, &size);
  92         if (idx < 0){
  93                 if (g_debugMode){
  94                         if (idx == -5)
  95                                 PrintAndLog("DEBUG: Error - not enough samples");
  96                         else if (idx == -1)
  97                                 PrintAndLog("DEBUG: Error - only noise found");
  98                         else if (idx == -2)
  99                                 PrintAndLog("DEBUG: Error - problem during ASK/Biphase demod");
 100                         else if (idx == -3)
 101                                 PrintAndLog("DEBUG: Error - Size not correct: %d", size);
 102                         else if (idx == -4)
 103                                 PrintAndLog("DEBUG: Error - NEDAP preamble not found");
 104                         else
 105                                 PrintAndLog("DEBUG: Error - idx: %d",idx);
 106                 }
 107                 return 0;
 108         }
 109
 110 /* Index map
 111 0        10        20          30            40          50        64
 112 |        |         |           |             |           |         |
 113  preamble    enc tag type         encrypted uid                    d    33    d    90    p    04    d    71    d    40    d    45    d    E7    P
 114 1111111110 00101101000001011 0100011001001000010110101001101011001 0 00110011 0 10010000 0 00000100 0 01110001 0 01000000 0 01000101 0 11100111 1
 115                                                                        uid2       uid1       uid0         I          I          R           R
 116          Tag ID is 049033
 117          I = Identical on all tags
 118          R = Random ?
 119          UID2, UID1, UID0 == card number
 120 */
 121         //get raw ID before removing parities
 122         uint32_t rawLo = bytebits_to_byte(DemodBuffer+idx+96,32);
 123         uint32_t rawHi = bytebits_to_byte(DemodBuffer+idx+64,32);
 124         uint32_t rawHi2 = bytebits_to_byte(DemodBuffer+idx+32,32);
 125         uint32_t rawHi3 = bytebits_to_byte(DemodBuffer+idx,32);
 126         setDemodBuf(DemodBuffer,128,idx);
 127
 128         // ok valid card found!
 129         uint32_t cardnum = bytebits_to_byte(DemodBuffer+81, 16);
 130         PrintAndLog("NEDAP ID Found - Card: %d - Raw: %08x%08x%08x%08x", cardnum, rawHi3, rawHi2, rawHi, rawLo);
 131
 132         if (g_debugMode){
 133                 PrintAndLog("DEBUG: idx: %d, Len: %d, Printing Demod Buffer:", idx, 128);
 134                 printDemodBuff();
 135         }
 136
 137         uint8_t last = GetParity( DemodBuffer, EVEN, 128);
 138 //      PrintAndLog("BIN: %s", sprint_bin_break( DemodBuffer, 128, 32) );
 139         PrintAndLog("TEST: LASTPARITY  %d | %d ", DemodBuffer[127], last);
 140
 141         return 1;
 142 }
 143 /*
 144 lf t55 wr b 1 d FF8B4168
 145 lf t55 wr b 2 d C90B5359
 146 lf t55 wr b 3 d 19A40087
 147 lf t55 wr b 4 d 120115CF
 148
 149 0)
 150 lf t55 wr b 1 d FF8B6B20
 151 lf t55 wr b 2 d F19B84A3
 152 lf t55 wr b 3 d 18058007
 153 lf t55 wr b 4 d 1200857C
 154
 155 */
 156
 157 int CmdLFNedapRead(const char *Cmd) {
 158         CmdLFRead("s");
 159         getSamples("30000",false);
 160         return CmdLFNedapDemod("");
 161 }
 162 /*
 163 int CmdLFNedapClone(const char *Cmd) {
 164
 165         char cmdp = param_getchar(Cmd, 0);
 166         if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_nedap_clone();
 167
 168         uint32_t cardnumber=0, cn = 0;
 169         uint32_t blocks[5];
 170         uint8_t i;
 171         uint8_t bs[128];
 172         memset(bs, 0x00, sizeof(bs));
 173
 174         if (sscanf(Cmd, "%u", &cn ) != 1) return usage_lf_nedap_clone();
 175
 176         cardnumber = (cn & 0x00FFFFFF);
 177
 178         if ( !GetNedapBits(cardnumber, bs)) {
 179                 PrintAndLog("Error with tag bitstream generation.");
 180                 return 1;
 181         }
 182
 183         ((ASK/biphase   data rawdemod ab 0 64 1 0
 184         //NEDAP - compat mode, ASK/Biphase, data rate 64, 4 data blocks
 185         blocks[0] = T55x7_MODULATION_BIPHASE | T55x7_BITRATE_RF_64 | 4<<T55x7_MAXBLOCK_SHIFT;
 186
 187         if (param_getchar(Cmd, 3) == 'Q' || param_getchar(Cmd, 3) == 'q')
 188                 blocks[0] = T5555_MODULATION_BIPHASE | T5555_INVERT_OUTPUT | 64<<T5555_BITRATE_SHIFT | 4<<T5555_MAXBLOCK_SHIFT;
 189
 190         blocks[1] = bytebits_to_byte(bs,32);
 191         blocks[2] = bytebits_to_byte(bs+32,32);
 192         blocks[3] = bytebits_to_byte(bs+64,32);
 193         blocks[4] = bytebits_to_byte(bs+96,32);
 194
 195         PrintAndLog("Preparing to clone NEDAP to T55x7 with card number: %u", cardnumber);
 196         PrintAndLog("Blk | Data ");
 197         PrintAndLog("----+------------");
 198         for ( i = 0; i<5; ++i )
 199                 PrintAndLog(" %02d | %08" PRIx32, i, blocks[i]);
 200
 201         UsbCommand resp;
 202         UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
 203
 204         for ( i = 0; i<5; ++i ) {
 205                 c.arg[0] = blocks[i];
 206                 c.arg[1] = i;
 207                 clearCommandBuffer();
 208                 SendCommand(&c);
 209                 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){
 210                         PrintAndLog("Error occurred, device did not respond during write operation.");
 211                         return -1;
 212                 }
 213         }
 214     return 0;
 215 }
 216 */
 217
 218 int CmdLFNedapSim(const char *Cmd) {
 219
 220         char cmdp = param_getchar(Cmd, 0);
 221         if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_nedap_sim();
 222
 223         uint32_t cardnumber = 0, cn = 0;
 224
 225         uint8_t bs[128];
 226         size_t size = sizeof(bs);
 227         memset(bs, 0x00, size);
 228
 229         // NEDAP,  Bihase = 2, clock 64, inverted,
 230         uint8_t encoding = 2, separator = 0, clk=64, invert=1;
 231         uint16_t arg1, arg2;
 232         arg1 = clk << 8 | encoding;
 233         arg2 = invert << 8 | separator;
 234
 235         if (sscanf(Cmd, "%u", &cn ) != 2) return usage_lf_nedap_sim();
 236         cardnumber = (cn & 0x00FFFFFF);
 237
 238         if ( !GetNedapBits(cardnumber, bs)) {
 239                 PrintAndLog("Error with tag bitstream generation.");
 240                 return 1;
 241         }
 242
 243         PrintAndLog("Simulating Nedap - CardNumber: %u", cardnumber );
 244
 245         UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
 246         memcpy(c.d.asBytes, bs, size);
 247         clearCommandBuffer();
 248         SendCommand(&c);
 249         return 0;
 250 }
 251
 252 int CmdLFNedapChk(const char *Cmd){
 253
 254         uint8_t data[20] = { 0x30, 0x16, 0x00, 0x71, 0x40, 0x21, 0xBE};
 255         int len = 0;
 256         param_gethex_ex(Cmd, 0, data, &len);
 257
 258         len = ( len == 0 ) ? 5 : len>>1;
 259
 260         PrintAndLog("Input: [%d] %s", len, sprint_hex(data, len));
 261
 262     uint8_t cl = 0x1D, ch = 0x1D, carry = 0;
 263     uint8_t al, bl, temp;
 264
 265         for (int i = 0; i < len; ++i){
 266                 al = data[i];
 267         for (int j = 8; j > 0; --j) {
 268
 269             bl = al ^ ch;
 270                         //printf("BL %02x | CH %02x \n", al, ch);
 271
 272             carry = (cl & 0x80) ? 1 : 0;
 273             cl <<= 1;
 274
 275             temp = (ch & 0x80) ? 1 : 0;
 276             ch = (ch << 1) | carry;
 277             carry = temp;
 278
 279             carry = (al & 0x80) ? 1 : 0;
 280             al <<= 1;
 281
 282             carry = (bl & 0x80) ? 1 : 0;
 283             bl <<= 1;
 284
 285             if (carry) {
 286                 cl ^= 0x21;
 287                 ch ^= 0x10;
 288             }
 289         }
 290     }
 291
 292         PrintAndLog("Nedap checksum: [ 0x21, 0xBE ] %x", ((ch << 8) | cl) );
 293         return 0;
 294 }
 295
 296
 297 static command_t CommandTable[] = {
 298     {"help",    CmdHelp,                1, "This help"},
 299         {"read",        CmdLFNedapRead, 0, "Attempt to read and extract tag data"},
 300 //      {"clone",       CmdLFNedapClone,0, "<Card Number>  clone nedap tag"},
 301         {"sim",         CmdLFNedapSim,  0, "<Card Number>  simulate nedap tag"},
 302         {"chk",         CmdLFNedapChk,  1, "Calculate Nedap Checksum <uid bytes>"},
 303     {NULL, NULL, 0, NULL}
 304 };
 305
 306 int CmdLFNedap(const char *Cmd) {
 307         clearCommandBuffer();
 308     CmdsParse(CommandTable, Cmd);
 309     return 0;
 310 }
 311
 312 int CmdHelp(const char *Cmd) {
 313     CmdsHelp(CommandTable);
 314     return 0;
 315 }