git.zerfleddert.de Git - proxmark3-svn/blob - client/cmdlfindala.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 Indala commands
   8 // PSK1, rf/32, 64 or 224 bits (known)
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include "cmdlfindala.h"
  14 #include "proxmark3.h"
  15 #include "ui.h"
  16 #include "graph.h"
  17 #include "cmdparser.h"
  18 #include "cmddata.h"  //for g_debugMode, demodbuff cmds
  19 #include "lfdemod.h"  //for indala26decode
  20 #include "util.h"     //for sprint_bin_break
  21 #include "cmdlf.h"    //for CmdLFRead
  22 #include "cmdmain.h"  //for clearCommandBuffer
  23
  24 static int CmdHelp(const char *Cmd);
  25
  26 // Indala 26 bit decode
  27 // by marshmellow
  28 // optional arguments - same as PSKDemod (clock & invert & maxerr)
  29 int CmdIndalaDecode(const char *Cmd) {
  30         int ans;
  31         if (strlen(Cmd)>0) {
  32                 ans = PSKDemod(Cmd, 0);
  33         } else { //default to RF/32
  34                 ans = PSKDemod("32", 0);
  35         }
  36
  37         if (!ans) {
  38                 if (g_debugMode) PrintAndLog("Error1: %i",ans);
  39                 return 0;
  40         }
  41         uint8_t invert=0;
  42         size_t size = DemodBufferLen;
  43         int startIdx = indala26decode(DemodBuffer, &size, &invert);
  44         if (startIdx < 0 || size > 224) {
  45                 if (g_debugMode) PrintAndLog("Error2: %i",startIdx);
  46                 return -1;
  47         }
  48         setDemodBuf(DemodBuffer, size, (size_t)startIdx);
  49         setClockGrid(g_DemodClock, g_DemodStartIdx + (startIdx*g_DemodClock));
  50         if (invert)
  51                 if (g_debugMode)
  52                         PrintAndLog("Had to invert bits");
  53
  54         PrintAndLog("BitLen: %d",DemodBufferLen);
  55         //convert UID to HEX
  56         uint32_t uid1, uid2, uid3, uid4, uid5, uid6, uid7;
  57         uid1=bytebits_to_byte(DemodBuffer,32);
  58         uid2=bytebits_to_byte(DemodBuffer+32,32);
  59         if (DemodBufferLen==64) {
  60                 PrintAndLog("Indala UID=%s (%x%08x)", sprint_bin_break(DemodBuffer,DemodBufferLen,16), uid1, uid2);
  61         } else if (DemodBufferLen==224) {
  62                 uid3=bytebits_to_byte(DemodBuffer+64,32);
  63                 uid4=bytebits_to_byte(DemodBuffer+96,32);
  64                 uid5=bytebits_to_byte(DemodBuffer+128,32);
  65                 uid6=bytebits_to_byte(DemodBuffer+160,32);
  66                 uid7=bytebits_to_byte(DemodBuffer+192,32);
  67                 PrintAndLog("Indala UID=%s (%x%08x%08x%08x%08x%08x%08x)",
  68                     sprint_bin_break(DemodBuffer,DemodBufferLen,16), uid1, uid2, uid3, uid4, uid5, uid6, uid7);
  69         }
  70         if (g_debugMode) {
  71                 PrintAndLog("DEBUG: printing demodbuffer:");
  72                 printDemodBuff();
  73         }
  74         return 1;
  75 }
  76
  77 int CmdIndalaRead(const char *Cmd) {
  78         lf_read(true, 30000);
  79         return CmdIndalaDecode("");
  80 }
  81
  82 // older alternative indala demodulate (has some positives and negatives)
  83 // returns false positives more often - but runs against more sets of samples
  84 // poor psk signal can be difficult to demod this approach might succeed when the other fails
  85 // but the other appears to currently be more accurate than this approach most of the time.
  86 int CmdIndalaDemod(const char *Cmd) {
  87         // Usage: recover 64bit UID by default, specify "224" as arg to recover a 224bit UID
  88
  89         int state = -1;
  90         int count = 0;
  91         int i, j;
  92
  93         // worst case with GraphTraceLen=64000 is < 4096
  94         // under normal conditions it's < 2048
  95
  96         uint8_t rawbits[4096];
  97         int rawbit = 0;
  98         int worst = 0, worstPos = 0;
  99
 100         //clear clock grid and demod plot
 101         setClockGrid(0, 0);
 102         DemodBufferLen = 0;
 103
 104         // PrintAndLog("Expecting a bit less than %d raw bits", GraphTraceLen / 32);
 105         // loop through raw signal - since we know it is psk1 rf/32 fc/2 skip every other value (+=2)
 106         for (i = 0; i < GraphTraceLen-1; i += 2) {
 107                 count += 1;
 108                 if ((GraphBuffer[i] > GraphBuffer[i + 1]) && (state != 1)) {
 109                         // appears redundant - marshmellow
 110                         if (state == 0) {
 111                                 for (j = 0; j <  count - 8; j += 16) {
 112                                         rawbits[rawbit++] = 0;
 113                                 }
 114                                 if ((abs(count - j)) > worst) {
 115                                         worst = abs(count - j);
 116                                         worstPos = i;
 117                                 }
 118                         }
 119                         state = 1;
 120                         count = 0;
 121                 } else if ((GraphBuffer[i] < GraphBuffer[i + 1]) && (state != 0)) {
 122                         //appears redundant
 123                         if (state == 1) {
 124                                 for (j = 0; j <  count - 8; j += 16) {
 125                                         rawbits[rawbit++] = 1;
 126                                 }
 127                                 if ((abs(count - j)) > worst) {
 128                                         worst = abs(count - j);
 129                                         worstPos = i;
 130                                 }
 131                         }
 132                         state = 0;
 133                         count = 0;
 134                 }
 135         }
 136
 137         if (rawbit>0){
 138                 PrintAndLog("Recovered %d raw bits, expected: %d", rawbit, GraphTraceLen/32);
 139                 PrintAndLog("worst metric (0=best..7=worst): %d at pos %d", worst, worstPos);
 140         } else {
 141                 return 0;
 142         }
 143
 144         // Finding the start of a UID
 145         int uidlen, long_wait;
 146         if (strcmp(Cmd, "224") == 0) {
 147                 uidlen = 224;
 148                 long_wait = 30;
 149         } else {
 150                 uidlen = 64;
 151                 long_wait = 29;
 152         }
 153
 154         int start;
 155         int first = 0;
 156         for (start = 0; start <= rawbit - uidlen; start++) {
 157                 first = rawbits[start];
 158                 for (i = start; i < start + long_wait; i++) {
 159                         if (rawbits[i] != first) {
 160                                 break;
 161                         }
 162                 }
 163                 if (i == (start + long_wait)) {
 164                         break;
 165                 }
 166         }
 167
 168         if (start == rawbit - uidlen + 1) {
 169                 PrintAndLog("nothing to wait for");
 170                 return 0;
 171         }
 172
 173         // Inverting signal if needed
 174         if (first == 1) {
 175                 for (i = start; i < rawbit; i++) {
 176                         rawbits[i] = !rawbits[i];
 177                 }
 178         }
 179
 180         // Dumping UID
 181         uint8_t bits[224] = {0x00};
 182         char showbits[225] = {0x00};
 183         int bit;
 184         i = start;
 185         int times = 0;
 186
 187         if (uidlen > rawbit) {
 188                 PrintAndLog("Warning: not enough raw bits to get a full UID");
 189                 for (bit = 0; bit < rawbit; bit++) {
 190                         bits[bit] = rawbits[i++];
 191                         // As we cannot know the parity, let's use "." and "/"
 192                         showbits[bit] = '.' + bits[bit];
 193                 }
 194                 showbits[bit+1]='\0';
 195                 PrintAndLog("Partial UID=%s", showbits);
 196                 return 0;
 197         } else {
 198                 for (bit = 0; bit < uidlen; bit++) {
 199                         bits[bit] = rawbits[i++];
 200                         showbits[bit] = '0' + bits[bit];
 201                 }
 202                 times = 1;
 203         }
 204
 205         //convert UID to HEX
 206         uint32_t uid1, uid2, uid3, uid4, uid5, uid6, uid7;
 207         int idx;
 208         uid1 = uid2 = 0;
 209
 210         if (uidlen==64){
 211                 for( idx=0; idx<64; idx++) {
 212                                 if (showbits[idx] == '0') {
 213                                 uid1=(uid1<<1)|(uid2>>31);
 214                                 uid2=(uid2<<1)|0;
 215                                 } else {
 216                                 uid1=(uid1<<1)|(uid2>>31);
 217                                 uid2=(uid2<<1)|1;
 218                                 }
 219                         }
 220                 PrintAndLog("UID=%s (%x%08x)", showbits, uid1, uid2);
 221         }
 222         else {
 223                 uid3 = uid4 = uid5 = uid6 = uid7 = 0;
 224
 225                 for( idx=0; idx<224; idx++) {
 226                                 uid1=(uid1<<1)|(uid2>>31);
 227                                 uid2=(uid2<<1)|(uid3>>31);
 228                                 uid3=(uid3<<1)|(uid4>>31);
 229                                 uid4=(uid4<<1)|(uid5>>31);
 230                                 uid5=(uid5<<1)|(uid6>>31);
 231                                 uid6=(uid6<<1)|(uid7>>31);
 232
 233                         if (showbits[idx] == '0')
 234                                 uid7 = (uid7<<1) | 0;
 235                         else
 236                                 uid7 = (uid7<<1) | 1;
 237                         }
 238                 PrintAndLog("UID=%s (%x%08x%08x%08x%08x%08x%08x)", showbits, uid1, uid2, uid3, uid4, uid5, uid6, uid7);
 239         }
 240
 241         // Checking UID against next occurrences
 242                 int failed = 0;
 243         for (; i + uidlen <= rawbit;) {
 244                 failed = 0;
 245                 for (bit = 0; bit < uidlen; bit++) {
 246                         if (bits[bit] != rawbits[i++]) {
 247                                 failed = 1;
 248                                 break;
 249                         }
 250                 }
 251                 if (failed == 1) {
 252                         break;
 253                 }
 254                 times += 1;
 255         }
 256
 257         PrintAndLog("Occurrences: %d (expected %d)", times, (rawbit - start) / uidlen);
 258
 259         // Remodulating for tag cloning
 260         // HACK: 2015-01-04 this will have an impact on our new way of seening lf commands (demod)
 261         // since this changes graphbuffer data.
 262         GraphTraceLen = 32*uidlen;
 263         i = 0;
 264         int phase = 0;
 265         for (bit = 0; bit < uidlen; bit++) {
 266                 if (bits[bit] == 0) {
 267                         phase = 0;
 268                 } else {
 269                         phase = 1;
 270                 }
 271                 int j;
 272                 for (j = 0; j < 32; j++) {
 273                         GraphBuffer[i++] = phase;
 274                         phase = !phase;
 275                 }
 276         }
 277
 278         RepaintGraphWindow();
 279         return 1;
 280 }
 281
 282 int CmdIndalaClone(const char *Cmd) {
 283         UsbCommand c;
 284         unsigned int uid1, uid2, uid3, uid4, uid5, uid6, uid7;
 285
 286         uid1 =  uid2 = uid3 = uid4 = uid5 = uid6 = uid7 = 0;
 287         int n = 0, i = 0;
 288
 289         if (strchr(Cmd,'l') != 0) {
 290                 while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
 291                         uid1 = (uid1 << 4) | (uid2 >> 28);
 292                         uid2 = (uid2 << 4) | (uid3 >> 28);
 293                         uid3 = (uid3 << 4) | (uid4 >> 28);
 294                         uid4 = (uid4 << 4) | (uid5 >> 28);
 295                         uid5 = (uid5 << 4) | (uid6 >> 28);
 296                         uid6 = (uid6 << 4) | (uid7 >> 28);
 297                         uid7 = (uid7 << 4) | (n & 0xf);
 298                 }
 299                 PrintAndLog("Cloning 224bit tag with UID %x%08x%08x%08x%08x%08x%08x", uid1, uid2, uid3, uid4, uid5, uid6, uid7);
 300                 c.cmd = CMD_INDALA_CLONE_TAG_L;
 301                 c.d.asDwords[0] = uid1;
 302                 c.d.asDwords[1] = uid2;
 303                 c.d.asDwords[2] = uid3;
 304                 c.d.asDwords[3] = uid4;
 305                 c.d.asDwords[4] = uid5;
 306                 c.d.asDwords[5] = uid6;
 307                 c.d.asDwords[6] = uid7;
 308         } else {
 309                 while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
 310                         uid1 = (uid1 << 4) | (uid2 >> 28);
 311                         uid2 = (uid2 << 4) | (n & 0xf);
 312                 }
 313                 PrintAndLog("Cloning 64bit tag with UID %x%08x", uid1, uid2);
 314                 c.cmd = CMD_INDALA_CLONE_TAG;
 315                 c.arg[0] = uid1;
 316                 c.arg[1] = uid2;
 317         }
 318
 319         clearCommandBuffer();
 320         SendCommand(&c);
 321         return 0;
 322 }
 323
 324 static command_t CommandTable[] = {
 325         {"help",     CmdHelp,         1, "This help"},
 326         {"demod",    CmdIndalaDecode, 1, "[clock] [invert<0|1>] -- Demodulate an indala tag (PSK1) from GraphBuffer (args optional)"},
 327         {"read",     CmdIndalaRead,   0, "Read an Indala Prox tag from the antenna"},
 328         {"clone",    CmdIndalaClone,  0, "<UID> ['l']-- Clone Indala to T55x7 (tag must be on antenna)(UID in HEX)(option 'l' for 224 UID"},
 329         {"altdemod", CmdIndalaDemod,  1, "['224'] -- Alternative method to Demodulate samples for Indala 64 bit UID (option '224' for 224 bit)"},
 330         //{"sim",      CmdIndalaSim,    0, "<ID> -- indala tag simulator"},
 331         {NULL, NULL, 0, NULL}
 332 };
 333
 334 int CmdLFINDALA(const char *Cmd) {
 335         CmdsParse(CommandTable, Cmd);
 336         return 0;
 337 }
 338
 339 int CmdHelp(const char *Cmd) {
 340         CmdsHelp(CommandTable);
 341         return 0;
 342 }