git.zerfleddert.de Git - proxmark3-svn/blob - armsrc/iclass.c

   1 //-----------------------------------------------------------------------------
   2 // Gerhard de Koning Gans - May 2008
   3 // Hagen Fritsch - June 2010
   4 // Gerhard de Koning Gans - May 2011
   5 // Gerhard de Koning Gans - June 2012 - Added iClass card and reader emulation
   6 //
   7 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   8 // at your option, any later version. See the LICENSE.txt file for the text of
   9 // the license.
  10 //-----------------------------------------------------------------------------
  11 // Routines to support iClass.
  12 //-----------------------------------------------------------------------------
  13 // Based on ISO14443a implementation. Still in experimental phase.
  14 // Contribution made during a security research at Radboud University Nijmegen
  15 //
  16 // Please feel free to contribute and extend iClass support!!
  17 //-----------------------------------------------------------------------------
  18 //
  19 // FIX:
  20 // ====
  21 // We still have sometimes a demodulation error when snooping iClass communication.
  22 // The resulting trace of a read-block-03 command may look something like this:
  23 //
  24 //  +  22279:    :     0c  03  e8  01
  25 //
  26 //    ...with an incorrect answer...
  27 //
  28 //  +     85:   0: TAG ff! ff! ff! ff! ff! ff! ff! ff! bb  33  bb  00  01! 0e! 04! bb     !crc
  29 //
  30 // We still left the error signalling bytes in the traces like 0xbb
  31 //
  32 // A correct trace should look like this:
  33 //
  34 // +  21112:    :     0c  03  e8  01
  35 // +     85:   0: TAG ff  ff  ff  ff  ff  ff  ff  ff  ea  f5
  36 //
  37 //-----------------------------------------------------------------------------
  38
  39 #include "proxmark3.h"
  40 #include "apps.h"
  41 #include "util.h"
  42 #include "string.h"
  43 #include "common.h"
  44 #include "cmd.h"
  45 // Needed for CRC in emulation mode;
  46 // same construction as in ISO 14443;
  47 // different initial value (CRC_ICLASS)
  48 #include "iso14443crc.h"
  49 #include "iso15693tools.h"
  50
  51 static int timeout = 4096;
  52
  53
  54 static int SendIClassAnswer(uint8_t *resp, int respLen, int delay);
  55
  56 //-----------------------------------------------------------------------------
  57 // The software UART that receives commands from the reader, and its state
  58 // variables.
  59 //-----------------------------------------------------------------------------
  60 static struct {
  61     enum {
  62         STATE_UNSYNCD,
  63         STATE_START_OF_COMMUNICATION,
  64         STATE_RECEIVING
  65     }       state;
  66     uint16_t    shiftReg;
  67     int     bitCnt;
  68     int     byteCnt;
  69     int     byteCntMax;
  70     int     posCnt;
  71     int     nOutOfCnt;
  72     int     OutOfCnt;
  73     int     syncBit;
  74     int     samples;
  75     int     highCnt;
  76     int     swapper;
  77     int     counter;
  78     int     bitBuffer;
  79     int     dropPosition;
  80     uint8_t *output;
  81 } Uart;
  82
  83 static RAMFUNC int OutOfNDecoding(int bit)
  84 {
  85         //int error = 0;
  86         int bitright;
  87
  88         if(!Uart.bitBuffer) {
  89                 Uart.bitBuffer = bit ^ 0xFF0;
  90                 return FALSE;
  91         }
  92         else {
  93                 Uart.bitBuffer <<= 4;
  94                 Uart.bitBuffer ^= bit;
  95         }
  96
  97         /*if(Uart.swapper) {
  98                 Uart.output[Uart.byteCnt] = Uart.bitBuffer & 0xFF;
  99                 Uart.byteCnt++;
 100                 Uart.swapper = 0;
 101                 if(Uart.byteCnt > 15) { return TRUE; }
 102         }
 103         else {
 104                 Uart.swapper = 1;
 105         }*/
 106
 107         if(Uart.state != STATE_UNSYNCD) {
 108                 Uart.posCnt++;
 109
 110                 if((Uart.bitBuffer & Uart.syncBit) ^ Uart.syncBit) {
 111                         bit = 0x00;
 112                 }
 113                 else {
 114                         bit = 0x01;
 115                 }
 116                 if(((Uart.bitBuffer << 1) & Uart.syncBit) ^ Uart.syncBit) {
 117                         bitright = 0x00;
 118                 }
 119                 else {
 120                         bitright = 0x01;
 121                 }
 122                 if(bit != bitright) { bit = bitright; }
 123
 124
 125                 // So, now we only have to deal with *bit*, lets see...
 126                 if(Uart.posCnt == 1) {
 127                         // measurement first half bitperiod
 128                         if(!bit) {
 129                                 // Drop in first half means that we are either seeing
 130                                 // an SOF or an EOF.
 131
 132                                 if(Uart.nOutOfCnt == 1) {
 133                                         // End of Communication
 134                                         Uart.state = STATE_UNSYNCD;
 135                                         Uart.highCnt = 0;
 136                                         if(Uart.byteCnt == 0) {
 137                                                 // Its not straightforward to show single EOFs
 138                                                 // So just leave it and do not return TRUE
 139                                                 Uart.output[0] = 0xf0;
 140                                                 Uart.byteCnt++;
 141                                         }
 142                                         else {
 143                                                 return TRUE;
 144                                         }
 145                                 }
 146                                 else if(Uart.state != STATE_START_OF_COMMUNICATION) {
 147                                         // When not part of SOF or EOF, it is an error
 148                                         Uart.state = STATE_UNSYNCD;
 149                                         Uart.highCnt = 0;
 150                                         //error = 4;
 151                                 }
 152                         }
 153                 }
 154                 else {
 155                         // measurement second half bitperiod
 156                         // Count the bitslot we are in... (ISO 15693)
 157                         Uart.nOutOfCnt++;
 158
 159                         if(!bit) {
 160                                 if(Uart.dropPosition) {
 161                                         if(Uart.state == STATE_START_OF_COMMUNICATION) {
 162                                                 //error = 1;
 163                                         }
 164                                         else {
 165                                                 //error = 7;
 166                                         }
 167                                         // It is an error if we already have seen a drop in current frame
 168                                         Uart.state = STATE_UNSYNCD;
 169                                         Uart.highCnt = 0;
 170                                 }
 171                                 else {
 172                                         Uart.dropPosition = Uart.nOutOfCnt;
 173                                 }
 174                         }
 175
 176                         Uart.posCnt = 0;
 177
 178
 179                         if(Uart.nOutOfCnt == Uart.OutOfCnt && Uart.OutOfCnt == 4) {
 180                                 Uart.nOutOfCnt = 0;
 181
 182                                 if(Uart.state == STATE_START_OF_COMMUNICATION) {
 183                                         if(Uart.dropPosition == 4) {
 184                                                 Uart.state = STATE_RECEIVING;
 185                                                 Uart.OutOfCnt = 256;
 186                                         }
 187                                         else if(Uart.dropPosition == 3) {
 188                                                 Uart.state = STATE_RECEIVING;
 189                                                 Uart.OutOfCnt = 4;
 190                                                 //Uart.output[Uart.byteCnt] = 0xdd;
 191                                                 //Uart.byteCnt++;
 192                                         }
 193                                         else {
 194                                                 Uart.state = STATE_UNSYNCD;
 195                                                 Uart.highCnt = 0;
 196                                         }
 197                                         Uart.dropPosition = 0;
 198                                 }
 199                                 else {
 200                                         // RECEIVING DATA
 201                                         // 1 out of 4
 202                                         if(!Uart.dropPosition) {
 203                                                 Uart.state = STATE_UNSYNCD;
 204                                                 Uart.highCnt = 0;
 205                                                 //error = 9;
 206                                         }
 207                                         else {
 208                                                 Uart.shiftReg >>= 2;
 209
 210                                                 // Swap bit order
 211                                                 Uart.dropPosition--;
 212                                                 //if(Uart.dropPosition == 1) { Uart.dropPosition = 2; }
 213                                                 //else if(Uart.dropPosition == 2) { Uart.dropPosition = 1; }
 214
 215                                                 Uart.shiftReg ^= ((Uart.dropPosition & 0x03) << 6);
 216                                                 Uart.bitCnt += 2;
 217                                                 Uart.dropPosition = 0;
 218
 219                                                 if(Uart.bitCnt == 8) {
 220                                                         Uart.output[Uart.byteCnt] = (Uart.shiftReg & 0xff);
 221                                                         Uart.byteCnt++;
 222                                                         Uart.bitCnt = 0;
 223                                                         Uart.shiftReg = 0;
 224                                                 }
 225                                         }
 226                                 }
 227                         }
 228                         else if(Uart.nOutOfCnt == Uart.OutOfCnt) {
 229                                 // RECEIVING DATA
 230                                 // 1 out of 256
 231                                 if(!Uart.dropPosition) {
 232                                         Uart.state = STATE_UNSYNCD;
 233                                         Uart.highCnt = 0;
 234                                         //error = 3;
 235                                 }
 236                                 else {
 237                                         Uart.dropPosition--;
 238                                         Uart.output[Uart.byteCnt] = (Uart.dropPosition & 0xff);
 239                                         Uart.byteCnt++;
 240                                         Uart.bitCnt = 0;
 241                                         Uart.shiftReg = 0;
 242                                         Uart.nOutOfCnt = 0;
 243                                         Uart.dropPosition = 0;
 244                                 }
 245                         }
 246
 247                         /*if(error) {
 248                                 Uart.output[Uart.byteCnt] = 0xAA;
 249                                 Uart.byteCnt++;
 250                                 Uart.output[Uart.byteCnt] = error & 0xFF;
 251                                 Uart.byteCnt++;
 252                                 Uart.output[Uart.byteCnt] = 0xAA;
 253                                 Uart.byteCnt++;
 254                                 Uart.output[Uart.byteCnt] = (Uart.bitBuffer >> 8) & 0xFF;
 255                                 Uart.byteCnt++;
 256                                 Uart.output[Uart.byteCnt] = Uart.bitBuffer & 0xFF;
 257                                 Uart.byteCnt++;
 258                                 Uart.output[Uart.byteCnt] = (Uart.syncBit >> 3) & 0xFF;
 259                                 Uart.byteCnt++;
 260                                 Uart.output[Uart.byteCnt] = 0xAA;
 261                                 Uart.byteCnt++;
 262                                 return TRUE;
 263                         }*/
 264                 }
 265
 266         }
 267         else {
 268                 bit = Uart.bitBuffer & 0xf0;
 269                 bit >>= 4;
 270                 bit ^= 0x0F; // drops become 1s ;-)
 271                 if(bit) {
 272                         // should have been high or at least (4 * 128) / fc
 273                         // according to ISO this should be at least (9 * 128 + 20) / fc
 274                         if(Uart.highCnt == 8) {
 275                                 // we went low, so this could be start of communication
 276                                 // it turns out to be safer to choose a less significant
 277                                 // syncbit... so we check whether the neighbour also represents the drop
 278                                 Uart.posCnt = 1;   // apparently we are busy with our first half bit period
 279                                 Uart.syncBit = bit & 8;
 280                                 Uart.samples = 3;
 281                                 if(!Uart.syncBit)       { Uart.syncBit = bit & 4; Uart.samples = 2; }
 282                                 else if(bit & 4)        { Uart.syncBit = bit & 4; Uart.samples = 2; bit <<= 2; }
 283                                 if(!Uart.syncBit)       { Uart.syncBit = bit & 2; Uart.samples = 1; }
 284                                 else if(bit & 2)        { Uart.syncBit = bit & 2; Uart.samples = 1; bit <<= 1; }
 285                                 if(!Uart.syncBit)       { Uart.syncBit = bit & 1; Uart.samples = 0;
 286                                         if(Uart.syncBit && (Uart.bitBuffer & 8)) {
 287                                                 Uart.syncBit = 8;
 288
 289                                                 // the first half bit period is expected in next sample
 290                                                 Uart.posCnt = 0;
 291                                                 Uart.samples = 3;
 292                                         }
 293                                 }
 294                                 else if(bit & 1)        { Uart.syncBit = bit & 1; Uart.samples = 0; }
 295
 296                                 Uart.syncBit <<= 4;
 297                                 Uart.state = STATE_START_OF_COMMUNICATION;
 298                                 Uart.bitCnt = 0;
 299                                 Uart.byteCnt = 0;
 300                                 Uart.nOutOfCnt = 0;
 301                                 Uart.OutOfCnt = 4; // Start at 1/4, could switch to 1/256
 302                                 Uart.dropPosition = 0;
 303                                 Uart.shiftReg = 0;
 304                                 //error = 0;
 305                         }
 306                         else {
 307                                 Uart.highCnt = 0;
 308                         }
 309                 }
 310                 else {
 311                         if(Uart.highCnt < 8) {
 312                                 Uart.highCnt++;
 313                         }
 314                 }
 315         }
 316
 317     return FALSE;
 318 }
 319
 320 //=============================================================================
 321 // Manchester
 322 //=============================================================================
 323
 324 static struct {
 325     enum {
 326         DEMOD_UNSYNCD,
 327                 DEMOD_START_OF_COMMUNICATION,
 328                 DEMOD_START_OF_COMMUNICATION2,
 329                 DEMOD_START_OF_COMMUNICATION3,
 330                 DEMOD_SOF_COMPLETE,
 331                 DEMOD_MANCHESTER_D,
 332                 DEMOD_MANCHESTER_E,
 333                 DEMOD_END_OF_COMMUNICATION,
 334                 DEMOD_END_OF_COMMUNICATION2,
 335                 DEMOD_MANCHESTER_F,
 336         DEMOD_ERROR_WAIT
 337     }       state;
 338     int     bitCount;
 339     int     posCount;
 340         int     syncBit;
 341     uint16_t    shiftReg;
 342         int     buffer;
 343         int     buffer2;
 344         int     buffer3;
 345         int     buff;
 346         int     samples;
 347     int     len;
 348         enum {
 349                 SUB_NONE,
 350                 SUB_FIRST_HALF,
 351                 SUB_SECOND_HALF,
 352                 SUB_BOTH
 353         }               sub;
 354     uint8_t *output;
 355 } Demod;
 356
 357 static RAMFUNC int ManchesterDecoding(int v)
 358 {
 359         int bit;
 360         int modulation;
 361         int error = 0;
 362
 363         bit = Demod.buffer;
 364         Demod.buffer = Demod.buffer2;
 365         Demod.buffer2 = Demod.buffer3;
 366         Demod.buffer3 = v;
 367
 368         if(Demod.buff < 3) {
 369                 Demod.buff++;
 370                 return FALSE;
 371         }
 372
 373         if(Demod.state==DEMOD_UNSYNCD) {
 374                 Demod.output[Demod.len] = 0xfa;
 375                 Demod.syncBit = 0;
 376                 //Demod.samples = 0;
 377                 Demod.posCount = 1;             // This is the first half bit period, so after syncing handle the second part
 378
 379                 if(bit & 0x08) {
 380                         Demod.syncBit = 0x08;
 381                 }
 382
 383                 if(bit & 0x04) {
 384                         if(Demod.syncBit) {
 385                                 bit <<= 4;
 386                         }
 387                         Demod.syncBit = 0x04;
 388                 }
 389
 390                 if(bit & 0x02) {
 391                         if(Demod.syncBit) {
 392                                 bit <<= 2;
 393                         }
 394                         Demod.syncBit = 0x02;
 395                 }
 396
 397                 if(bit & 0x01 && Demod.syncBit) {
 398                         Demod.syncBit = 0x01;
 399                 }
 400
 401                 if(Demod.syncBit) {
 402                         Demod.len = 0;
 403                         Demod.state = DEMOD_START_OF_COMMUNICATION;
 404                         Demod.sub = SUB_FIRST_HALF;
 405                         Demod.bitCount = 0;
 406                         Demod.shiftReg = 0;
 407                         Demod.samples = 0;
 408                         if(Demod.posCount) {
 409                                 //if(trigger) LED_A_OFF();  // Not useful in this case...
 410                                 switch(Demod.syncBit) {
 411                                         case 0x08: Demod.samples = 3; break;
 412                                         case 0x04: Demod.samples = 2; break;
 413                                         case 0x02: Demod.samples = 1; break;
 414                                         case 0x01: Demod.samples = 0; break;
 415                                 }
 416                                 // SOF must be long burst... otherwise stay unsynced!!!
 417                                 if(!(Demod.buffer & Demod.syncBit) || !(Demod.buffer2 & Demod.syncBit)) {
 418                                         Demod.state = DEMOD_UNSYNCD;
 419                                 }
 420                         }
 421                         else {
 422                                 // SOF must be long burst... otherwise stay unsynced!!!
 423                                 if(!(Demod.buffer2 & Demod.syncBit) || !(Demod.buffer3 & Demod.syncBit)) {
 424                                         Demod.state = DEMOD_UNSYNCD;
 425                                         error = 0x88;
 426                                 }
 427
 428                         }
 429                         error = 0;
 430
 431                 }
 432         }
 433         else {
 434                 modulation = bit & Demod.syncBit;
 435                 modulation |= ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
 436
 437                 Demod.samples += 4;
 438
 439                 if(Demod.posCount==0) {
 440                         Demod.posCount = 1;
 441                         if(modulation) {
 442                                 Demod.sub = SUB_FIRST_HALF;
 443                         }
 444                         else {
 445                                 Demod.sub = SUB_NONE;
 446                         }
 447                 }
 448                 else {
 449                         Demod.posCount = 0;
 450                         /*(modulation && (Demod.sub == SUB_FIRST_HALF)) {
 451                                 if(Demod.state!=DEMOD_ERROR_WAIT) {
 452                                         Demod.state = DEMOD_ERROR_WAIT;
 453                                         Demod.output[Demod.len] = 0xaa;
 454                                         error = 0x01;
 455                                 }
 456                         }*/
 457                         //else if(modulation) {
 458                         if(modulation) {
 459                                 if(Demod.sub == SUB_FIRST_HALF) {
 460                                         Demod.sub = SUB_BOTH;
 461                                 }
 462                                 else {
 463                                         Demod.sub = SUB_SECOND_HALF;
 464                                 }
 465                         }
 466                         else if(Demod.sub == SUB_NONE) {
 467                                 if(Demod.state == DEMOD_SOF_COMPLETE) {
 468                                         Demod.output[Demod.len] = 0x0f;
 469                                         Demod.len++;
 470                                         Demod.state = DEMOD_UNSYNCD;
 471 //                                      error = 0x0f;
 472                                         return TRUE;
 473                                 }
 474                                 else {
 475                                         Demod.state = DEMOD_ERROR_WAIT;
 476                                         error = 0x33;
 477                                 }
 478                                 /*if(Demod.state!=DEMOD_ERROR_WAIT) {
 479                                         Demod.state = DEMOD_ERROR_WAIT;
 480                                         Demod.output[Demod.len] = 0xaa;
 481                                         error = 0x01;
 482                                 }*/
 483                         }
 484
 485                         switch(Demod.state) {
 486                                 case DEMOD_START_OF_COMMUNICATION:
 487                                         if(Demod.sub == SUB_BOTH) {
 488                                                 //Demod.state = DEMOD_MANCHESTER_D;
 489                                                 Demod.state = DEMOD_START_OF_COMMUNICATION2;
 490                                                 Demod.posCount = 1;
 491                                                 Demod.sub = SUB_NONE;
 492                                         }
 493                                         else {
 494                                                 Demod.output[Demod.len] = 0xab;
 495                                                 Demod.state = DEMOD_ERROR_WAIT;
 496                                                 error = 0xd2;
 497                                         }
 498                                         break;
 499                                 case DEMOD_START_OF_COMMUNICATION2:
 500                                         if(Demod.sub == SUB_SECOND_HALF) {
 501                                                 Demod.state = DEMOD_START_OF_COMMUNICATION3;
 502                                         }
 503                                         else {
 504                                                 Demod.output[Demod.len] = 0xab;
 505                                                 Demod.state = DEMOD_ERROR_WAIT;
 506                                                 error = 0xd3;
 507                                         }
 508                                         break;
 509                                 case DEMOD_START_OF_COMMUNICATION3:
 510                                         if(Demod.sub == SUB_SECOND_HALF) {
 511 //                                              Demod.state = DEMOD_MANCHESTER_D;
 512                                                 Demod.state = DEMOD_SOF_COMPLETE;
 513                                                 //Demod.output[Demod.len] = Demod.syncBit & 0xFF;
 514                                                 //Demod.len++;
 515                                         }
 516                                         else {
 517                                                 Demod.output[Demod.len] = 0xab;
 518                                                 Demod.state = DEMOD_ERROR_WAIT;
 519                                                 error = 0xd4;
 520                                         }
 521                                         break;
 522                                 case DEMOD_SOF_COMPLETE:
 523                                 case DEMOD_MANCHESTER_D:
 524                                 case DEMOD_MANCHESTER_E:
 525                                         // OPPOSITE FROM ISO14443 - 11110000 = 0 (1 in 14443)
 526                                         //                          00001111 = 1 (0 in 14443)
 527                                         if(Demod.sub == SUB_SECOND_HALF) { // SUB_FIRST_HALF
 528                                                 Demod.bitCount++;
 529                                                 Demod.shiftReg = (Demod.shiftReg >> 1) ^ 0x100;
 530                                                 Demod.state = DEMOD_MANCHESTER_D;
 531                                         }
 532                                         else if(Demod.sub == SUB_FIRST_HALF) { // SUB_SECOND_HALF
 533                                                 Demod.bitCount++;
 534                                                 Demod.shiftReg >>= 1;
 535                                                 Demod.state = DEMOD_MANCHESTER_E;
 536                                         }
 537                                         else if(Demod.sub == SUB_BOTH) {
 538                                                 Demod.state = DEMOD_MANCHESTER_F;
 539                                         }
 540                                         else {
 541                                                 Demod.state = DEMOD_ERROR_WAIT;
 542                                                 error = 0x55;
 543                                         }
 544                                         break;
 545
 546                                 case DEMOD_MANCHESTER_F:
 547                                         // Tag response does not need to be a complete byte!
 548                                         if(Demod.len > 0 || Demod.bitCount > 0) {
 549                                                 if(Demod.bitCount > 1) {  // was > 0, do not interpret last closing bit, is part of EOF
 550                                                         Demod.shiftReg >>= (9 - Demod.bitCount);        // right align data
 551                                                         Demod.output[Demod.len] = Demod.shiftReg & 0xff;
 552                                                         Demod.len++;
 553                                                 }
 554
 555                                                 Demod.state = DEMOD_UNSYNCD;
 556                                                 return TRUE;
 557                                         }
 558                                         else {
 559                                                 Demod.output[Demod.len] = 0xad;
 560                                                 Demod.state = DEMOD_ERROR_WAIT;
 561                                                 error = 0x03;
 562                                         }
 563                                         break;
 564
 565                                 case DEMOD_ERROR_WAIT:
 566                                         Demod.state = DEMOD_UNSYNCD;
 567                                         break;
 568
 569                                 default:
 570                                         Demod.output[Demod.len] = 0xdd;
 571                                         Demod.state = DEMOD_UNSYNCD;
 572                                         break;
 573                         }
 574
 575                         /*if(Demod.bitCount>=9) {
 576                                 Demod.output[Demod.len] = Demod.shiftReg & 0xff;
 577                                 Demod.len++;
 578
 579                                 Demod.parityBits <<= 1;
 580                                 Demod.parityBits ^= ((Demod.shiftReg >> 8) & 0x01);
 581
 582                                 Demod.bitCount = 0;
 583                                 Demod.shiftReg = 0;
 584                         }*/
 585                         if(Demod.bitCount>=8) {
 586                                 Demod.shiftReg >>= 1;
 587                                 Demod.output[Demod.len] = (Demod.shiftReg & 0xff);
 588                                 Demod.len++;
 589                                 Demod.bitCount = 0;
 590                                 Demod.shiftReg = 0;
 591                         }
 592
 593                         if(error) {
 594                                 Demod.output[Demod.len] = 0xBB;
 595                                 Demod.len++;
 596                                 Demod.output[Demod.len] = error & 0xFF;
 597                                 Demod.len++;
 598                                 Demod.output[Demod.len] = 0xBB;
 599                                 Demod.len++;
 600                                 Demod.output[Demod.len] = bit & 0xFF;
 601                                 Demod.len++;
 602                                 Demod.output[Demod.len] = Demod.buffer & 0xFF;
 603                                 Demod.len++;
 604                                 // Look harder ;-)
 605                                 Demod.output[Demod.len] = Demod.buffer2 & 0xFF;
 606                                 Demod.len++;
 607                                 Demod.output[Demod.len] = Demod.syncBit & 0xFF;
 608                                 Demod.len++;
 609                                 Demod.output[Demod.len] = 0xBB;
 610                                 Demod.len++;
 611                                 return TRUE;
 612                         }
 613
 614                 }
 615
 616         } // end (state != UNSYNCED)
 617
 618     return FALSE;
 619 }
 620
 621 //=============================================================================
 622 // Finally, a `sniffer' for iClass communication
 623 // Both sides of communication!
 624 //=============================================================================
 625
 626 //-----------------------------------------------------------------------------
 627 // Record the sequence of commands sent by the reader to the tag, with
 628 // triggering so that we start recording at the point that the tag is moved
 629 // near the reader.
 630 //-----------------------------------------------------------------------------
 631 void RAMFUNC SnoopIClass(void)
 632 {
 633
 634
 635     // We won't start recording the frames that we acquire until we trigger;
 636     // a good trigger condition to get started is probably when we see a
 637     // response from the tag.
 638     //int triggered = FALSE; // FALSE to wait first for card
 639
 640     // The command (reader -> tag) that we're receiving.
 641         // The length of a received command will in most cases be no more than 18 bytes.
 642         // So 32 should be enough!
 643         uint8_t *readerToTagCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
 644     // The response (tag -> reader) that we're receiving.
 645         uint8_t *tagToReaderResponse = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
 646
 647     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 648
 649     // reset traceLen to 0
 650     iso14a_set_tracing(TRUE);
 651     iso14a_clear_trace();
 652     iso14a_set_trigger(FALSE);
 653
 654     // The DMA buffer, used to stream samples from the FPGA
 655     int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
 656     int lastRxCounter;
 657     int8_t *upTo;
 658     int smpl;
 659     int maxBehindBy = 0;
 660
 661     // Count of samples received so far, so that we can include timing
 662     // information in the trace buffer.
 663     int samples = 0;
 664     rsamples = 0;
 665
 666     // Set up the demodulator for tag -> reader responses.
 667         Demod.output = tagToReaderResponse;
 668     Demod.len = 0;
 669     Demod.state = DEMOD_UNSYNCD;
 670
 671     // Setup for the DMA.
 672     FpgaSetupSsc();
 673     upTo = dmaBuf;
 674     lastRxCounter = DMA_BUFFER_SIZE;
 675     FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
 676
 677     // And the reader -> tag commands
 678     memset(&Uart, 0, sizeof(Uart));
 679         Uart.output = readerToTagCmd;
 680     Uart.byteCntMax = 32; // was 100 (greg)////////////////////////////////////////////////////////////////////////
 681     Uart.state = STATE_UNSYNCD;
 682
 683     // And put the FPGA in the appropriate mode
 684     // Signal field is off with the appropriate LED
 685     LED_D_OFF();
 686     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
 687     SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 688
 689         uint32_t time_0 = GetCountSspClk();
 690
 691
 692     int div = 0;
 693     //int div2 = 0;
 694     int decbyte = 0;
 695     int decbyter = 0;
 696
 697     // And now we loop, receiving samples.
 698     for(;;) {
 699         LED_A_ON();
 700         WDT_HIT();
 701         int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
 702                                 (DMA_BUFFER_SIZE-1);
 703         if(behindBy > maxBehindBy) {
 704             maxBehindBy = behindBy;
 705             if(behindBy > 400) {
 706                 Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
 707                 goto done;
 708             }
 709         }
 710         if(behindBy < 1) continue;
 711
 712         LED_A_OFF();
 713         smpl = upTo[0];
 714         upTo++;
 715         lastRxCounter -= 1;
 716         if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
 717             upTo -= DMA_BUFFER_SIZE;
 718             lastRxCounter += DMA_BUFFER_SIZE;
 719             AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
 720             AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
 721         }
 722
 723         //samples += 4;
 724         samples += 1;
 725
 726         if(smpl & 0xF) {
 727                 decbyte ^= (1 << (3 - div));
 728         }
 729
 730         // FOR READER SIDE COMMUMICATION...
 731
 732         decbyter <<= 2;
 733         decbyter ^= (smpl & 0x30);
 734
 735         div++;
 736
 737         if((div + 1) % 2 == 0) {
 738                 smpl = decbyter;
 739                 if(OutOfNDecoding((smpl & 0xF0) >> 4)) {
 740                     rsamples = samples - Uart.samples;
 741                     LED_C_ON();
 742
 743                         //if(!LogTrace(Uart.output,Uart.byteCnt, rsamples, Uart.parityBits,TRUE)) break;
 744                         //if(!LogTrace(NULL, 0, Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, 0, TRUE)) break;
 745                         if(tracing)     {
 746                                 uint8_t parity[MAX_PARITY_SIZE];
 747                                 GetParity(Uart.output, Uart.byteCnt, parity);
 748                                 LogTrace(Uart.output,Uart.byteCnt, (GetCountSspClk()-time_0) << 4, (GetCountSspClk()-time_0) << 4, parity, TRUE);
 749                         }
 750
 751
 752                         /* And ready to receive another command. */
 753                     Uart.state = STATE_UNSYNCD;
 754                     /* And also reset the demod code, which might have been */
 755                     /* false-triggered by the commands from the reader. */
 756                     Demod.state = DEMOD_UNSYNCD;
 757                     LED_B_OFF();
 758                     Uart.byteCnt = 0;
 759                 }
 760                 decbyter = 0;
 761         }
 762
 763         if(div > 3) {
 764                 smpl = decbyte;
 765                 if(ManchesterDecoding(smpl & 0x0F)) {
 766                     rsamples = samples - Demod.samples;
 767                     LED_B_ON();
 768
 769                         if(tracing)     {
 770                                 uint8_t parity[MAX_PARITY_SIZE];
 771                                 GetParity(Demod.output, Demod.len, parity);
 772                                 LogTrace(Demod.output, Demod.len, (GetCountSspClk()-time_0) << 4, (GetCountSspClk()-time_0) << 4, parity, FALSE);
 773                         }
 774
 775
 776                     // And ready to receive another response.
 777                     memset(&Demod, 0, sizeof(Demod));
 778                         Demod.output = tagToReaderResponse;
 779                     Demod.state = DEMOD_UNSYNCD;
 780                     LED_C_OFF();
 781                 }
 782
 783                 div = 0;
 784                 decbyte = 0x00;
 785         }
 786         //}
 787
 788         if(BUTTON_PRESS()) {
 789             DbpString("cancelled_a");
 790             goto done;
 791         }
 792     }
 793
 794     DbpString("COMMAND FINISHED");
 795
 796     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
 797     Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
 798
 799 done:
 800     AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
 801     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
 802     Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
 803     LED_A_OFF();
 804     LED_B_OFF();
 805     LED_C_OFF();
 806     LED_D_OFF();
 807 }
 808
 809 void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {
 810         int i;
 811         for(i = 0; i < 8; i++) {
 812                 rotatedCSN[i] = (originalCSN[i] >> 3) | (originalCSN[(i+1)%8] << 5);
 813         }
 814 }
 815
 816 //-----------------------------------------------------------------------------
 817 // Wait for commands from reader
 818 // Stop when button is pressed
 819 // Or return TRUE when command is captured
 820 //-----------------------------------------------------------------------------
 821 static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
 822 {
 823     // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen
 824     // only, since we are receiving, not transmitting).
 825     // Signal field is off with the appropriate LED
 826     LED_D_OFF();
 827     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
 828
 829     // Now run a `software UART' on the stream of incoming samples.
 830     Uart.output = received;
 831     Uart.byteCntMax = maxLen;
 832     Uart.state = STATE_UNSYNCD;
 833
 834     for(;;) {
 835         WDT_HIT();
 836
 837         if(BUTTON_PRESS()) return FALSE;
 838
 839         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
 840             AT91C_BASE_SSC->SSC_THR = 0x00;
 841         }
 842         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
 843             uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
 844
 845                         if(OutOfNDecoding(b & 0x0f)) {
 846                                 *len = Uart.byteCnt;
 847                                 return TRUE;
 848                         }
 849         }
 850     }
 851 }
 852
 853
 854 //-----------------------------------------------------------------------------
 855 // Prepare tag messages
 856 //-----------------------------------------------------------------------------
 857 static void CodeIClassTagAnswer(const uint8_t *cmd, int len)
 858 {
 859         //So far a dummy implementation, not used
 860         //int lastProxToAirDuration =0;
 861         int i;
 862
 863         ToSendReset();
 864
 865         // Send SOF
 866         ToSend[++ToSendMax] = 0x00;
 867         ToSend[++ToSendMax] = 0x00;
 868         ToSend[++ToSendMax] = 0x00;
 869         ToSend[++ToSendMax] = 0xff;//Proxtoair duration starts here
 870         ToSend[++ToSendMax] = 0xff;
 871         ToSend[++ToSendMax] = 0xff;
 872         ToSend[++ToSendMax] = 0x00;
 873         ToSend[++ToSendMax] = 0xff;
 874
 875         for(i = 0; i < len; i++) {
 876                 int j;
 877                 uint8_t b = cmd[i];
 878
 879                 // Data bits
 880                 for(j = 0; j < 8; j++) {
 881                         if(b & 1) {
 882                                 ToSend[++ToSendMax] = 0x00;
 883                                 ToSend[++ToSendMax] = 0xff;
 884                         } else {
 885                                 ToSend[++ToSendMax] = 0xff;
 886                                 ToSend[++ToSendMax] = 0x00;
 887                         }
 888                         b >>= 1;
 889                 }
 890         }
 891
 892         // Send EOF
 893         ToSend[++ToSendMax] = 0xff;
 894         ToSend[++ToSendMax] = 0x00;
 895         ToSend[++ToSendMax] = 0xff;
 896         ToSend[++ToSendMax] = 0xff;
 897         ToSend[++ToSendMax] = 0xff;
 898         ToSend[++ToSendMax] = 0x00;
 899         ToSend[++ToSendMax] = 0x00;
 900         ToSend[++ToSendMax] = 0x00;
 901
 902         //lastProxToAirDuration  = 8*ToSendMax - 3*8 - 3*8;//Not counting zeroes in the beginning or end
 903
 904         // Convert from last byte pos to length
 905         ToSendMax++;
 906 }
 907
 908 // Only SOF
 909 static void CodeIClassTagSOF()
 910 {
 911         //So far a dummy implementation, not used
 912         //int lastProxToAirDuration =0;
 913
 914         ToSendReset();
 915         // Send SOF
 916         ToSend[++ToSendMax] = 0x00;
 917         ToSend[++ToSendMax] = 0x00;
 918         ToSend[++ToSendMax] = 0x00;
 919         ToSend[++ToSendMax] = 0xff;
 920         ToSend[++ToSendMax] = 0xff;
 921         ToSend[++ToSendMax] = 0xff;
 922         ToSend[++ToSendMax] = 0x00;
 923         ToSend[++ToSendMax] = 0xff;
 924
 925 //      lastProxToAirDuration  = 8*ToSendMax - 3*8;//Not counting zeroes in the beginning
 926
 927
 928         // Convert from last byte pos to length
 929         ToSendMax++;
 930 }
 931 int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf);
 932 /**
 933  * @brief SimulateIClass simulates an iClass card.
 934  * @param arg0 type of simulation
 935  *                      - 0 uses the first 8 bytes in usb data as CSN
 936  *                      - 2 "dismantling iclass"-attack. This mode iterates through all CSN's specified
 937  *                      in the usb data. This mode collects MAC from the reader, in order to do an offline
 938  *                      attack on the keys. For more info, see "dismantling iclass" and proxclone.com.
 939  *                      - Other : Uses the default CSN (031fec8af7ff12e0)
 940  * @param arg1 - number of CSN's contained in datain (applicable for mode 2 only)
 941  * @param arg2
 942  * @param datain
 943  */
 944 void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain)
 945 {
 946         uint32_t simType = arg0;
 947         uint32_t numberOfCSNS = arg1;
 948         FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 949
 950         // Enable and clear the trace
 951         iso14a_set_tracing(TRUE);
 952         iso14a_clear_trace();
 953
 954         uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
 955         if(simType == 0) {
 956                 // Use the CSN from commandline
 957                 memcpy(csn_crc, datain, 8);
 958                 doIClassSimulation(csn_crc,0,NULL);
 959         }else if(simType == 1)
 960         {
 961                 doIClassSimulation(csn_crc,0,NULL);
 962         }
 963         else if(simType == 2)
 964         {
 965
 966                 uint8_t mac_responses[64] = { 0 };
 967                 Dbprintf("Going into attack mode, %d CSNS sent", numberOfCSNS);
 968                 // In this mode, a number of csns are within datain. We'll simulate each one, one at a time
 969                 // in order to collect MAC's from the reader. This can later be used in an offlne-attack
 970                 // in order to obtain the keys, as in the "dismantling iclass"-paper.
 971                 int i = 0;
 972                 for( ; i < numberOfCSNS && i*8+8 < USB_CMD_DATA_SIZE; i++)
 973                 {
 974                         // The usb data is 512 bytes, fitting 65 8-byte CSNs in there.
 975
 976                         memcpy(csn_crc, datain+(i*8), 8);
 977                         if(doIClassSimulation(csn_crc,1,mac_responses+i*8))
 978                         {
 979                                 return; // Button pressed
 980                         }
 981                 }
 982                 cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);
 983
 984         }
 985         else{
 986                 // We may want a mode here where we hardcode the csns to use (from proxclone).
 987                 // That will speed things up a little, but not required just yet.
 988                 Dbprintf("The mode is not implemented, reserved for future use");
 989         }
 990         Dbprintf("Done...");
 991
 992 }
 993 /**
 994  * @brief Does the actual simulation
 995  * @param csn - csn to use
 996  * @param breakAfterMacReceived if true, returns after reader MAC has been received.
 997  */
 998 int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf)
 999 {
1000         // CSN followed by two CRC bytes
1001         uint8_t response2[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1002         uint8_t response3[] = { 0,0,0,0,0,0,0,0,0,0};
1003         memcpy(response3,csn,sizeof(response3));
1004         Dbprintf("Simulating CSN %02x%02x%02x%02x%02x%02x%02x%02x",csn[0],csn[1],csn[2],csn[3],csn[4],csn[5],csn[6],csn[7]);
1005         // e-Purse
1006         uint8_t response4[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1007
1008         // Construct anticollision-CSN
1009         rotateCSN(response3,response2);
1010
1011         // Compute CRC on both CSNs
1012         ComputeCrc14443(CRC_ICLASS, response2, 8, &response2[8], &response2[9]);
1013         ComputeCrc14443(CRC_ICLASS, response3, 8, &response3[8], &response3[9]);
1014
1015         int exitLoop = 0;
1016         // Reader 0a
1017         // Tag    0f
1018         // Reader 0c
1019         // Tag    anticoll. CSN
1020         // Reader 81 anticoll. CSN
1021         // Tag    CSN
1022
1023         uint8_t *resp;
1024         int respLen;
1025         uint8_t* respdata = NULL;
1026         int respsize = 0;
1027         uint8_t sof = 0x0f;
1028
1029         // Respond SOF -- takes 8 bytes
1030         uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
1031         int resp1Len;
1032
1033         // Anticollision CSN (rotated CSN)
1034         // 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit)
1035         uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 10);
1036         int resp2Len;
1037
1038         // CSN
1039         // 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit)
1040         uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 190);
1041         int resp3Len;
1042
1043         // e-Purse
1044         // 144: Takes 16 bytes for SOF/EOF and 8 * 16 = 128 bytes (2 bytes/bit)
1045         uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 370);
1046         int resp4Len;
1047
1048         // + 1720..
1049         uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
1050         memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
1051         int len;
1052
1053         // Prepare card messages
1054         ToSendMax = 0;
1055
1056         // First card answer: SOF
1057         CodeIClassTagSOF();
1058         memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
1059
1060         // Anticollision CSN
1061         CodeIClassTagAnswer(response2, sizeof(response2));
1062         memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax;
1063
1064         // CSN
1065         CodeIClassTagAnswer(response3, sizeof(response3));
1066         memcpy(resp3, ToSend, ToSendMax); resp3Len = ToSendMax;
1067
1068         // e-Purse
1069         CodeIClassTagAnswer(response4, sizeof(response4));
1070         memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax;
1071
1072
1073         // Start from off (no field generated)
1074         //FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1075         //SpinDelay(200);
1076         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
1077         SpinDelay(100);
1078         StartCountSspClk();
1079         // We need to listen to the high-frequency, peak-detected path.
1080         SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1081         FpgaSetupSsc();
1082
1083         // To control where we are in the protocol
1084         int cmdsRecvd = 0;
1085         uint32_t time_0 = GetCountSspClk();
1086         uint32_t t2r_time =0;
1087         uint32_t r2t_time =0;
1088
1089         LED_A_ON();
1090         bool buttonPressed = false;
1091
1092         /** Hack  for testing
1093         memcpy(reader_mac_buf,csn,8);
1094         exitLoop = true;
1095         end hack **/
1096
1097         while(!exitLoop) {
1098
1099                 LED_B_OFF();
1100                 //Signal tracer
1101                 // Can be used to get a trigger for an oscilloscope..
1102                 LED_C_OFF();
1103
1104                 if(!GetIClassCommandFromReader(receivedCmd, &len, 100)) {
1105                         buttonPressed = true;
1106                         break;
1107                 }
1108                 r2t_time = GetCountSspClk();
1109                 //Signal tracer
1110                 LED_C_ON();
1111
1112                 // Okay, look at the command now.
1113                 if(receivedCmd[0] == 0x0a ) {
1114                         // Reader in anticollission phase
1115                         resp = resp1; respLen = resp1Len; //order = 1;
1116                         respdata = &sof;
1117                         respsize = sizeof(sof);
1118                 } else if(receivedCmd[0] == 0x0c) {
1119                         // Reader asks for anticollission CSN
1120                         resp = resp2; respLen = resp2Len; //order = 2;
1121                         respdata = response2;
1122                         respsize = sizeof(response2);
1123                         //DbpString("Reader requests anticollission CSN:");
1124                 } else if(receivedCmd[0] == 0x81) {
1125                         // Reader selects anticollission CSN.
1126                         // Tag sends the corresponding real CSN
1127                         resp = resp3; respLen = resp3Len; //order = 3;
1128                         respdata = response3;
1129                         respsize = sizeof(response3);
1130                         //DbpString("Reader selects anticollission CSN:");
1131                 } else if(receivedCmd[0] == 0x88) {
1132                         // Read e-purse (88 02)
1133                         resp = resp4; respLen = resp4Len; //order = 4;
1134                         respdata = response4;
1135                         respsize = sizeof(response4);
1136                         LED_B_ON();
1137                 } else if(receivedCmd[0] == 0x05) {
1138                         // Reader random and reader MAC!!!
1139                         // Do not respond
1140             // We do not know what to answer, so lets keep quiet
1141                         resp = resp1; respLen = 0; //order = 5;
1142                         respdata = NULL;
1143                         respsize = 0;
1144                         if (breakAfterMacReceived){
1145                                 // dbprintf:ing ...
1146                                 Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x"
1147                                                    ,csn[0],csn[1],csn[2],csn[3],csn[4],csn[5],csn[6],csn[7]);
1148                                 Dbprintf("RDR:  (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",len,
1149                                                 receivedCmd[0], receivedCmd[1], receivedCmd[2],
1150                                                 receivedCmd[3], receivedCmd[4], receivedCmd[5],
1151                                                 receivedCmd[6], receivedCmd[7], receivedCmd[8]);
1152                                 if (reader_mac_buf != NULL)
1153                                 {
1154                                         memcpy(reader_mac_buf,receivedCmd+1,8);
1155                                 }
1156                                 exitLoop = true;
1157                         }
1158                 } else if(receivedCmd[0] == 0x00 && len == 1) {
1159                         // Reader ends the session
1160                         resp = resp1; respLen = 0; //order = 0;
1161                         respdata = NULL;
1162                         respsize = 0;
1163                 } else {
1164                         //#db# Unknown command received from reader (len=5): 26 1 0 f6 a 44 44 44 44
1165                         // Never seen this command before
1166                         Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x",
1167                         len,
1168                         receivedCmd[0], receivedCmd[1], receivedCmd[2],
1169                         receivedCmd[3], receivedCmd[4], receivedCmd[5],
1170                         receivedCmd[6], receivedCmd[7], receivedCmd[8]);
1171                         // Do not respond
1172                         resp = resp1; respLen = 0; //order = 0;
1173                         respdata = NULL;
1174                         respsize = 0;
1175                 }
1176
1177                 if(cmdsRecvd >  100) {
1178                         //DbpString("100 commands later...");
1179                         //break;
1180                 }
1181                 else {
1182                         cmdsRecvd++;
1183                 }
1184
1185                 if(respLen > 0) {
1186                         SendIClassAnswer(resp, respLen, 21);
1187                         t2r_time = GetCountSspClk();
1188                 }
1189
1190                 if (tracing) {
1191                         uint8_t parity[MAX_PARITY_SIZE];
1192                         GetParity(receivedCmd, len, parity);
1193                         LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, (r2t_time-time_0) << 4, parity, TRUE);
1194
1195                         if (respdata != NULL) {
1196                                 GetParity(respdata, respsize, parity);
1197                                 LogTrace(respdata, respsize, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, FALSE);
1198                         }
1199                         if(!tracing) {
1200                                 DbpString("Trace full");
1201                                 //break;
1202                         }
1203
1204                 }
1205                 memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
1206         }
1207
1208         //Dbprintf("%x", cmdsRecvd);
1209         LED_A_OFF();
1210         LED_B_OFF();
1211         if(buttonPressed)
1212         {
1213                 DbpString("Button pressed");
1214         }
1215         return buttonPressed;
1216 }
1217
1218 static int SendIClassAnswer(uint8_t *resp, int respLen, int delay)
1219 {
1220         int i = 0, d=0;//, u = 0, d = 0;
1221         uint8_t b = 0;
1222
1223         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
1224
1225         AT91C_BASE_SSC->SSC_THR = 0x00;
1226         FpgaSetupSsc();
1227         while(!BUTTON_PRESS()) {
1228                 if((AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)){
1229                         b = AT91C_BASE_SSC->SSC_RHR; (void) b;
1230                 }
1231                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)){
1232                         b = 0x00;
1233                         if(d < delay) {
1234                                 d++;
1235                         }
1236                         else {
1237                                 if( i < respLen){
1238                                         b = resp[i];
1239                                         //Hack
1240                                         //b = 0xAC;
1241                                 }
1242                                 i++;
1243                         }
1244                         AT91C_BASE_SSC->SSC_THR = b;
1245                 }
1246
1247                 if (i > respLen +4) break;
1248         }
1249
1250         return 0;
1251 }
1252
1253 /// THE READER CODE
1254
1255 //-----------------------------------------------------------------------------
1256 // Transmit the command (to the tag) that was placed in ToSend[].
1257 //-----------------------------------------------------------------------------
1258 static void TransmitIClassCommand(const uint8_t *cmd, int len, int *samples, int *wait)
1259 {
1260   int c;
1261   FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1262   AT91C_BASE_SSC->SSC_THR = 0x00;
1263   FpgaSetupSsc();
1264
1265    if (wait)
1266    {
1267      if(*wait < 10) *wait = 10;
1268
1269      for(c = 0; c < *wait;) {
1270        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1271          AT91C_BASE_SSC->SSC_THR = 0x00;                // For exact timing!
1272          c++;
1273        }
1274        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1275          volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
1276          (void)r;
1277        }
1278        WDT_HIT();
1279      }
1280
1281    }
1282
1283
1284   uint8_t sendbyte;
1285   bool firstpart = TRUE;
1286   c = 0;
1287   for(;;) {
1288     if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1289
1290       // DOUBLE THE SAMPLES!
1291       if(firstpart) {
1292         sendbyte = (cmd[c] & 0xf0) | (cmd[c] >> 4);
1293       }
1294       else {
1295         sendbyte = (cmd[c] & 0x0f) | (cmd[c] << 4);
1296         c++;
1297       }
1298       if(sendbyte == 0xff) {
1299         sendbyte = 0xfe;
1300       }
1301       AT91C_BASE_SSC->SSC_THR = sendbyte;
1302       firstpart = !firstpart;
1303
1304       if(c >= len) {
1305         break;
1306       }
1307     }
1308     if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1309       volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
1310       (void)r;
1311     }
1312     WDT_HIT();
1313   }
1314   if (samples) *samples = (c + *wait) << 3;
1315 }
1316
1317
1318 //-----------------------------------------------------------------------------
1319 // Prepare iClass reader command to send to FPGA
1320 //-----------------------------------------------------------------------------
1321 void CodeIClassCommand(const uint8_t * cmd, int len)
1322 {
1323   int i, j, k;
1324   uint8_t b;
1325
1326   ToSendReset();
1327
1328   // Start of Communication: 1 out of 4
1329   ToSend[++ToSendMax] = 0xf0;
1330   ToSend[++ToSendMax] = 0x00;
1331   ToSend[++ToSendMax] = 0x0f;
1332   ToSend[++ToSendMax] = 0x00;
1333
1334   // Modulate the bytes
1335   for (i = 0; i < len; i++) {
1336     b = cmd[i];
1337     for(j = 0; j < 4; j++) {
1338       for(k = 0; k < 4; k++) {
1339                         if(k == (b & 3)) {
1340                                 ToSend[++ToSendMax] = 0x0f;
1341                         }
1342                         else {
1343                                 ToSend[++ToSendMax] = 0x00;
1344                         }
1345       }
1346       b >>= 2;
1347     }
1348   }
1349
1350   // End of Communication
1351   ToSend[++ToSendMax] = 0x00;
1352   ToSend[++ToSendMax] = 0x00;
1353   ToSend[++ToSendMax] = 0xf0;
1354   ToSend[++ToSendMax] = 0x00;
1355
1356   // Convert from last character reference to length
1357   ToSendMax++;
1358 }
1359
1360 void ReaderTransmitIClass(uint8_t* frame, int len)
1361 {
1362         int wait = 0;
1363         int samples = 0;
1364
1365         // This is tied to other size changes
1366         CodeIClassCommand(frame,len);
1367
1368         // Select the card
1369         TransmitIClassCommand(ToSend, ToSendMax, &samples, &wait);
1370         if(trigger)
1371                 LED_A_ON();
1372
1373         // Store reader command in buffer
1374         if (tracing) {
1375                 uint8_t par[MAX_PARITY_SIZE];
1376                 GetParity(frame, len, par);
1377                 LogTrace(frame, len, rsamples, rsamples, par, TRUE);
1378         }
1379 }
1380
1381 //-----------------------------------------------------------------------------
1382 // Wait a certain time for tag response
1383 //  If a response is captured return TRUE
1384 //  If it takes too long return FALSE
1385 //-----------------------------------------------------------------------------
1386 static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) //uint8_t *buffer
1387 {
1388         // buffer needs to be 512 bytes
1389         int c;
1390
1391         // Set FPGA mode to "reader listen mode", no modulation (listen
1392         // only, since we are receiving, not transmitting).
1393         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN);
1394
1395         // Now get the answer from the card
1396         Demod.output = receivedResponse;
1397         Demod.len = 0;
1398         Demod.state = DEMOD_UNSYNCD;
1399
1400         uint8_t b;
1401         if (elapsed) *elapsed = 0;
1402
1403         bool skip = FALSE;
1404
1405         c = 0;
1406         for(;;) {
1407                 WDT_HIT();
1408
1409                 if(BUTTON_PRESS()) return FALSE;
1410
1411                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1412                         AT91C_BASE_SSC->SSC_THR = 0x00;  // To make use of exact timing of next command from reader!!
1413                         if (elapsed) (*elapsed)++;
1414                 }
1415                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1416                         if(c < timeout) { c++; } else { return FALSE; }
1417                         b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
1418                         skip = !skip;
1419                         if(skip) continue;
1420
1421                         if(ManchesterDecoding(b & 0x0f)) {
1422                                 *samples = c << 3;
1423                                 return  TRUE;
1424                         }
1425                 }
1426         }
1427 }
1428
1429 int ReaderReceiveIClass(uint8_t* receivedAnswer)
1430 {
1431   int samples = 0;
1432   if (!GetIClassAnswer(receivedAnswer,160,&samples,0)) return FALSE;
1433   rsamples += samples;
1434   if (tracing) {
1435         uint8_t parity[MAX_PARITY_SIZE];
1436         GetParity(receivedAnswer, Demod.len, parity);
1437         LogTrace(receivedAnswer,Demod.len,rsamples,rsamples,parity,FALSE);
1438   }
1439   if(samples == 0) return FALSE;
1440   return Demod.len;
1441 }
1442
1443 void setupIclassReader()
1444 {
1445     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
1446     // Reset trace buffer
1447     iso14a_set_tracing(TRUE);
1448     iso14a_clear_trace();
1449
1450     // Setup SSC
1451     FpgaSetupSsc();
1452     // Start from off (no field generated)
1453     // Signal field is off with the appropriate LED
1454     LED_D_OFF();
1455     FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1456     SpinDelay(200);
1457
1458     SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1459
1460     // Now give it time to spin up.
1461     // Signal field is on with the appropriate LED
1462     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1463     SpinDelay(200);
1464     LED_A_ON();
1465
1466 }
1467
1468 size_t sendCmdGetResponseWithRetries(uint8_t* command, size_t cmdsize, uint8_t* resp, uint8_t expected_size, uint8_t retries)
1469 {
1470         while(retries-- > 0)
1471         {
1472                 ReaderTransmitIClass(command, cmdsize);
1473                 if(expected_size == ReaderReceiveIClass(resp)){
1474                         return 0;
1475                 }
1476         }
1477         return 1;//Error
1478 }
1479
1480 /**
1481  * @brief Talks to an iclass tag, sends the commands to get CSN and CC.
1482  * @param card_data where the CSN and CC are stored for return
1483  * @return 0 = fail
1484  *         1 = Got CSN
1485  *         2 = Got CSN and CC
1486  */
1487 uint8_t handshakeIclassTag(uint8_t *card_data)
1488 {
1489         static uint8_t act_all[]     = { 0x0a };
1490         static uint8_t identify[]    = { 0x0c };
1491         static uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1492         static uint8_t readcheck_cc[]= { 0x88, 0x02 };
1493         uint8_t *resp = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
1494
1495         uint8_t read_status = 0;
1496
1497         // Send act_all
1498         ReaderTransmitIClass(act_all, 1);
1499         // Card present?
1500         if(!ReaderReceiveIClass(resp)) return read_status;//Fail
1501         //Send Identify
1502         ReaderTransmitIClass(identify, 1);
1503         //We expect a 10-byte response here, 8 byte anticollision-CSN and 2 byte CRC
1504         uint8_t len  = ReaderReceiveIClass(resp);
1505         if(len != 10) return read_status;//Fail
1506
1507         //Copy the Anti-collision CSN to our select-packet
1508         memcpy(&select[1],resp,8);
1509         //Select the card
1510         ReaderTransmitIClass(select, sizeof(select));
1511         //We expect a 10-byte response here, 8 byte CSN and 2 byte CRC
1512         len  = ReaderReceiveIClass(resp);
1513         if(len != 10) return read_status;//Fail
1514
1515         //Success - level 1, we got CSN
1516         //Save CSN in response data
1517         memcpy(card_data,resp,8);
1518
1519         //Flag that we got to at least stage 1, read CSN
1520         read_status = 1;
1521
1522         // Card selected, now read e-purse (cc)
1523         ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
1524         if(ReaderReceiveIClass(resp) == 8) {
1525                 //Save CC (e-purse) in response data
1526                 memcpy(card_data+8,resp,8);
1527
1528                 //Got both
1529                 read_status = 2;
1530         }
1531
1532         return read_status;
1533 }
1534
1535 // Reader iClass Anticollission
1536 void ReaderIClass(uint8_t arg0) {
1537
1538     uint8_t card_data[24]={0};
1539     uint8_t last_csn[8]={0};
1540
1541     int read_status= 0;
1542     bool abort_after_read = arg0 & FLAG_ICLASS_READER_ONLY_ONCE;
1543         bool get_cc = arg0 & FLAG_ICLASS_READER_GET_CC;
1544
1545     setupIclassReader();
1546
1547     size_t datasize = 0;
1548     while(!BUTTON_PRESS())
1549     {
1550
1551                 if(traceLen > TRACE_SIZE) {
1552                         DbpString("Trace full");
1553                         break;
1554                 }
1555                 WDT_HIT();
1556
1557                 read_status = handshakeIclassTag(card_data);
1558
1559                 if(read_status == 0) continue;
1560                 if(read_status == 1) datasize = 8;
1561                 if(read_status == 2) datasize = 16;
1562
1563                 LED_B_ON();
1564                 //Send back to client, but don't bother if we already sent this
1565                 if(memcmp(last_csn, card_data, 8) != 0)
1566                 {
1567
1568                         if(!get_cc || (get_cc && read_status == 2))
1569                         {
1570                                 cmd_send(CMD_ACK,read_status,0,0,card_data,datasize);
1571                                 if(abort_after_read) {
1572                                         LED_A_OFF();
1573                                         return;
1574                                 }
1575                                 //Save that we already sent this....
1576                                 memcpy(last_csn, card_data, 8);
1577                         }
1578                         //If 'get_cc' was specified and we didn't get a CC, we'll just keep trying...
1579                 }
1580                 LED_B_OFF();
1581     }
1582     cmd_send(CMD_ACK,0,0,0,card_data, 0);
1583     LED_A_OFF();
1584 }
1585
1586 void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
1587
1588         uint8_t card_data[USB_CMD_DATA_SIZE]={0};
1589         uint16_t block_crc_LUT[255] = {0};
1590
1591         {//Generate a lookup table for block crc
1592                 for(int block = 0; block < 255; block++){
1593                         char bl = block;
1594                         block_crc_LUT[block] = iclass_crc16(&bl ,1);
1595                 }
1596         }
1597         //Dbprintf("Lookup table: %02x %02x %02x" ,block_crc_LUT[0],block_crc_LUT[1],block_crc_LUT[2]);
1598
1599         uint8_t check[]       = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1600         uint8_t read[]        = { 0x0c, 0x00, 0x00, 0x00 };
1601
1602     uint16_t crc = 0;
1603         uint8_t cardsize=0;
1604         uint8_t mem=0;
1605
1606         static struct memory_t{
1607           int k16;
1608           int book;
1609           int k2;
1610           int lockauth;
1611           int keyaccess;
1612         } memory;
1613
1614         uint8_t* resp = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
1615
1616     setupIclassReader();
1617
1618
1619         while(!BUTTON_PRESS()) {
1620
1621                 WDT_HIT();
1622
1623                 if(traceLen > TRACE_SIZE) {
1624                         DbpString("Trace full");
1625                         break;
1626                 }
1627
1628                 uint8_t read_status = handshakeIclassTag(card_data);
1629                 if(read_status < 2) continue;
1630
1631                 //for now replay captured auth (as cc not updated)
1632                 memcpy(check+5,MAC,4);
1633
1634                 if(sendCmdGetResponseWithRetries(check, sizeof(check),resp, 4, 5))
1635                 {
1636                         Dbprintf("Error: Authentication Fail!");
1637                         continue;
1638                 }
1639
1640                 //first get configuration block (block 1)
1641                 crc = block_crc_LUT[1];
1642                 read[1]=1;
1643                 read[2] = crc >> 8;
1644                 read[3] = crc & 0xff;
1645
1646                 if(sendCmdGetResponseWithRetries(read, sizeof(read),resp, 10, 10))
1647                 {
1648                         Dbprintf("Dump config (block 1) failed");
1649                         continue;
1650                 }
1651
1652                 mem=resp[5];
1653                 memory.k16= (mem & 0x80);
1654                 memory.book= (mem & 0x20);
1655                 memory.k2= (mem & 0x8);
1656                 memory.lockauth= (mem & 0x2);
1657                 memory.keyaccess= (mem & 0x1);
1658
1659                 cardsize = memory.k16 ? 255 : 32;
1660                 WDT_HIT();
1661                 //Set card_data to all zeroes, we'll fill it with data
1662                 memset(card_data,0x0,USB_CMD_DATA_SIZE);
1663                 uint8_t failedRead =0;
1664                 uint8_t stored_data_length =0;
1665                 //then loop around remaining blocks
1666                 for(int block=0; block < cardsize; block++){
1667
1668                         read[1]= block;
1669                         crc = block_crc_LUT[block];
1670                         read[2] = crc >> 8;
1671                         read[3] = crc & 0xff;
1672
1673                         if(!sendCmdGetResponseWithRetries(read, sizeof(read), resp, 10, 10))
1674                         {
1675                                 Dbprintf("     %02x: %02x %02x %02x %02x %02x %02x %02x %02x",
1676                                                  block, resp[0], resp[1], resp[2],
1677                                                 resp[3], resp[4], resp[5],
1678                                                 resp[6], resp[7]);
1679
1680                                 //Fill up the buffer
1681                                 memcpy(card_data+stored_data_length,resp,8);
1682                                 stored_data_length += 8;
1683
1684                                 if(stored_data_length +8 > USB_CMD_DATA_SIZE)
1685                                 {//Time to send this off and start afresh
1686                                         cmd_send(CMD_ACK,
1687                                                          stored_data_length,//data length
1688                                                          failedRead,//Failed blocks?
1689                                                          0,//Not used ATM
1690                                                          card_data, stored_data_length);
1691                                         //reset
1692                                         stored_data_length = 0;
1693                                         failedRead = 0;
1694                                 }
1695
1696                         }else{
1697                                 failedRead = 1;
1698                                 stored_data_length +=8;//Otherwise, data becomes misaligned
1699                                 Dbprintf("Failed to dump block %d", block);
1700                         }
1701                 }
1702                 //Send off any remaining data
1703                 if(stored_data_length > 0)
1704                 {
1705                         cmd_send(CMD_ACK,
1706                                          stored_data_length,//data length
1707                                          failedRead,//Failed blocks?
1708                                          0,//Not used ATM
1709                                          card_data, stored_data_length);
1710                 }
1711                 //If we got here, let's break
1712                 break;
1713         }
1714         //Signal end of transmission
1715         cmd_send(CMD_ACK,
1716                          0,//data length
1717                          0,//Failed blocks?
1718                          0,//Not used ATM
1719                          card_data, 0);
1720
1721         LED_A_OFF();
1722 }
1723
1724 //2. Create Read method (cut-down from above) based off responses from 1.
1725 //   Since we have the MAC could continue to use replay function.
1726 //3. Create Write method
1727 /*
1728 void IClass_iso14443A_write(uint8_t arg0, uint8_t blockNo, uint8_t *data, uint8_t *MAC) {
1729         uint8_t act_all[]     = { 0x0a };
1730         uint8_t identify[]    = { 0x0c };
1731         uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1732         uint8_t readcheck_cc[]= { 0x88, 0x02 };
1733         uint8_t check[]       = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1734         uint8_t read[]        = { 0x0c, 0x00, 0x00, 0x00 };
1735         uint8_t write[]       = { 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1736
1737     uint16_t crc = 0;
1738
1739         uint8_t* resp = (((uint8_t *)BigBuf) + 3560);
1740
1741         // Reset trace buffer
1742     memset(trace, 0x44, RECV_CMD_OFFSET);
1743         traceLen = 0;
1744
1745         // Setup SSC
1746         FpgaSetupSsc();
1747         // Start from off (no field generated)
1748         // Signal field is off with the appropriate LED
1749         LED_D_OFF();
1750         FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1751         SpinDelay(200);
1752
1753         SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1754
1755         // Now give it time to spin up.
1756         // Signal field is on with the appropriate LED
1757         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1758         SpinDelay(200);
1759
1760         LED_A_ON();
1761
1762         for(int i=0;i<1;i++) {
1763
1764                 if(traceLen > TRACE_SIZE) {
1765                         DbpString("Trace full");
1766                         break;
1767                 }
1768
1769                 if (BUTTON_PRESS()) break;
1770
1771                 // Send act_all
1772                 ReaderTransmitIClass(act_all, 1);
1773                 // Card present?
1774                 if(ReaderReceiveIClass(resp)) {
1775                         ReaderTransmitIClass(identify, 1);
1776                         if(ReaderReceiveIClass(resp) == 10) {
1777                                 // Select card
1778                                 memcpy(&select[1],resp,8);
1779                                 ReaderTransmitIClass(select, sizeof(select));
1780
1781                                 if(ReaderReceiveIClass(resp) == 10) {
1782                                         Dbprintf("     Selected CSN: %02x %02x %02x %02x %02x %02x %02x %02x",
1783                                         resp[0], resp[1], resp[2],
1784                                         resp[3], resp[4], resp[5],
1785                                         resp[6], resp[7]);
1786                                 }
1787                                 // Card selected
1788                                 Dbprintf("Readcheck on Sector 2");
1789                                 ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
1790                                 if(ReaderReceiveIClass(resp) == 8) {
1791                                    Dbprintf("     CC: %02x %02x %02x %02x %02x %02x %02x %02x",
1792                                         resp[0], resp[1], resp[2],
1793                                         resp[3], resp[4], resp[5],
1794                                         resp[6], resp[7]);
1795                                 }else return;
1796                                 Dbprintf("Authenticate");
1797                                 //for now replay captured auth (as cc not updated)
1798                                 memcpy(check+5,MAC,4);
1799                                 Dbprintf("     AA: %02x %02x %02x %02x",
1800                                         check[5], check[6], check[7],check[8]);
1801                                 ReaderTransmitIClass(check, sizeof(check));
1802                                 if(ReaderReceiveIClass(resp) == 4) {
1803                                    Dbprintf("     AR: %02x %02x %02x %02x",
1804                                         resp[0], resp[1], resp[2],resp[3]);
1805                                 }else {
1806                                   Dbprintf("Error: Authentication Fail!");
1807                                   return;
1808                                 }
1809                                 Dbprintf("Write Block");
1810
1811                                 //read configuration for max block number
1812                                 read_success=false;
1813                                 read[1]=1;
1814                                 uint8_t *blockno=&read[1];
1815                                 crc = iclass_crc16((char *)blockno,1);
1816                                 read[2] = crc >> 8;
1817                                 read[3] = crc & 0xff;
1818                                 while(!read_success){
1819                                       ReaderTransmitIClass(read, sizeof(read));
1820                                       if(ReaderReceiveIClass(resp) == 10) {
1821                                          read_success=true;
1822                                          mem=resp[5];
1823                                          memory.k16= (mem & 0x80);
1824                                          memory.book= (mem & 0x20);
1825                                          memory.k2= (mem & 0x8);
1826                                          memory.lockauth= (mem & 0x2);
1827                                          memory.keyaccess= (mem & 0x1);
1828
1829                                       }
1830                                 }
1831                                 if (memory.k16){
1832                                   cardsize=255;
1833                                 }else cardsize=32;
1834                                 //check card_size
1835
1836                                 memcpy(write+1,blockNo,1);
1837                                 memcpy(write+2,data,8);
1838                                 memcpy(write+10,mac,4);
1839                                 while(!send_success){
1840                                   ReaderTransmitIClass(write, sizeof(write));
1841                                   if(ReaderReceiveIClass(resp) == 10) {
1842                                     write_success=true;
1843                                 }
1844                         }//
1845                 }
1846                 WDT_HIT();
1847         }
1848
1849         LED_A_OFF();
1850 }*/