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                 //modulation = ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
 437
 438                 Demod.samples += 4;
 439
 440                 if(Demod.posCount==0) {
 441                         Demod.posCount = 1;
 442                         if(modulation) {
 443                                 Demod.sub = SUB_FIRST_HALF;
 444                         }
 445                         else {
 446                                 Demod.sub = SUB_NONE;
 447                         }
 448                 }
 449                 else {
 450                         Demod.posCount = 0;
 451                         /*(modulation && (Demod.sub == SUB_FIRST_HALF)) {
 452                                 if(Demod.state!=DEMOD_ERROR_WAIT) {
 453                                         Demod.state = DEMOD_ERROR_WAIT;
 454                                         Demod.output[Demod.len] = 0xaa;
 455                                         error = 0x01;
 456                                 }
 457                         }*/
 458                         //else if(modulation) {
 459                         if(modulation) {
 460                                 if(Demod.sub == SUB_FIRST_HALF) {
 461                                         Demod.sub = SUB_BOTH;
 462                                 }
 463                                 else {
 464                                         Demod.sub = SUB_SECOND_HALF;
 465                                 }
 466                         }
 467                         else if(Demod.sub == SUB_NONE) {
 468                                 if(Demod.state == DEMOD_SOF_COMPLETE) {
 469                                         Demod.output[Demod.len] = 0x0f;
 470                                         Demod.len++;
 471                                         Demod.state = DEMOD_UNSYNCD;
 472 //                                      error = 0x0f;
 473                                         return TRUE;
 474                                 }
 475                                 else {
 476                                         Demod.state = DEMOD_ERROR_WAIT;
 477                                         error = 0x33;
 478                                 }
 479                                 /*if(Demod.state!=DEMOD_ERROR_WAIT) {
 480                                         Demod.state = DEMOD_ERROR_WAIT;
 481                                         Demod.output[Demod.len] = 0xaa;
 482                                         error = 0x01;
 483                                 }*/
 484                         }
 485
 486                         switch(Demod.state) {
 487                                 case DEMOD_START_OF_COMMUNICATION:
 488                                         if(Demod.sub == SUB_BOTH) {
 489                                                 //Demod.state = DEMOD_MANCHESTER_D;
 490                                                 Demod.state = DEMOD_START_OF_COMMUNICATION2;
 491                                                 Demod.posCount = 1;
 492                                                 Demod.sub = SUB_NONE;
 493                                         }
 494                                         else {
 495                                                 Demod.output[Demod.len] = 0xab;
 496                                                 Demod.state = DEMOD_ERROR_WAIT;
 497                                                 error = 0xd2;
 498                                         }
 499                                         break;
 500                                 case DEMOD_START_OF_COMMUNICATION2:
 501                                         if(Demod.sub == SUB_SECOND_HALF) {
 502                                                 Demod.state = DEMOD_START_OF_COMMUNICATION3;
 503                                         }
 504                                         else {
 505                                                 Demod.output[Demod.len] = 0xab;
 506                                                 Demod.state = DEMOD_ERROR_WAIT;
 507                                                 error = 0xd3;
 508                                         }
 509                                         break;
 510                                 case DEMOD_START_OF_COMMUNICATION3:
 511                                         if(Demod.sub == SUB_SECOND_HALF) {
 512 //                                              Demod.state = DEMOD_MANCHESTER_D;
 513                                                 Demod.state = DEMOD_SOF_COMPLETE;
 514                                                 //Demod.output[Demod.len] = Demod.syncBit & 0xFF;
 515                                                 //Demod.len++;
 516                                         }
 517                                         else {
 518                                                 Demod.output[Demod.len] = 0xab;
 519                                                 Demod.state = DEMOD_ERROR_WAIT;
 520                                                 error = 0xd4;
 521                                         }
 522                                         break;
 523                                 case DEMOD_SOF_COMPLETE:
 524                                 case DEMOD_MANCHESTER_D:
 525                                 case DEMOD_MANCHESTER_E:
 526                                         // OPPOSITE FROM ISO14443 - 11110000 = 0 (1 in 14443)
 527                                         //                          00001111 = 1 (0 in 14443)
 528                                         if(Demod.sub == SUB_SECOND_HALF) { // SUB_FIRST_HALF
 529                                                 Demod.bitCount++;
 530                                                 Demod.shiftReg = (Demod.shiftReg >> 1) ^ 0x100;
 531                                                 Demod.state = DEMOD_MANCHESTER_D;
 532                                         }
 533                                         else if(Demod.sub == SUB_FIRST_HALF) { // SUB_SECOND_HALF
 534                                                 Demod.bitCount++;
 535                                                 Demod.shiftReg >>= 1;
 536                                                 Demod.state = DEMOD_MANCHESTER_E;
 537                                         }
 538                                         else if(Demod.sub == SUB_BOTH) {
 539                                                 Demod.state = DEMOD_MANCHESTER_F;
 540                                         }
 541                                         else {
 542                                                 Demod.state = DEMOD_ERROR_WAIT;
 543                                                 error = 0x55;
 544                                         }
 545                                         break;
 546
 547                                 case DEMOD_MANCHESTER_F:
 548                                         // Tag response does not need to be a complete byte!
 549                                         if(Demod.len > 0 || Demod.bitCount > 0) {
 550                                                 if(Demod.bitCount > 1) {  // was > 0, do not interpret last closing bit, is part of EOF
 551                                                         Demod.shiftReg >>= (9 - Demod.bitCount);        // right align data
 552                                                         Demod.output[Demod.len] = Demod.shiftReg & 0xff;
 553                                                         Demod.len++;
 554                                                 }
 555
 556                                                 Demod.state = DEMOD_UNSYNCD;
 557                                                 return TRUE;
 558                                         }
 559                                         else {
 560                                                 Demod.output[Demod.len] = 0xad;
 561                                                 Demod.state = DEMOD_ERROR_WAIT;
 562                                                 error = 0x03;
 563                                         }
 564                                         break;
 565
 566                                 case DEMOD_ERROR_WAIT:
 567                                         Demod.state = DEMOD_UNSYNCD;
 568                                         break;
 569
 570                                 default:
 571                                         Demod.output[Demod.len] = 0xdd;
 572                                         Demod.state = DEMOD_UNSYNCD;
 573                                         break;
 574                         }
 575
 576                         /*if(Demod.bitCount>=9) {
 577                                 Demod.output[Demod.len] = Demod.shiftReg & 0xff;
 578                                 Demod.len++;
 579
 580                                 Demod.parityBits <<= 1;
 581                                 Demod.parityBits ^= ((Demod.shiftReg >> 8) & 0x01);
 582
 583                                 Demod.bitCount = 0;
 584                                 Demod.shiftReg = 0;
 585                         }*/
 586                         if(Demod.bitCount>=8) {
 587                                 Demod.shiftReg >>= 1;
 588                                 Demod.output[Demod.len] = (Demod.shiftReg & 0xff);
 589                                 Demod.len++;
 590                                 Demod.bitCount = 0;
 591                                 Demod.shiftReg = 0;
 592                         }
 593
 594                         if(error) {
 595                                 Demod.output[Demod.len] = 0xBB;
 596                                 Demod.len++;
 597                                 Demod.output[Demod.len] = error & 0xFF;
 598                                 Demod.len++;
 599                                 Demod.output[Demod.len] = 0xBB;
 600                                 Demod.len++;
 601                                 Demod.output[Demod.len] = bit & 0xFF;
 602                                 Demod.len++;
 603                                 Demod.output[Demod.len] = Demod.buffer & 0xFF;
 604                                 Demod.len++;
 605                                 // Look harder ;-)
 606                                 Demod.output[Demod.len] = Demod.buffer2 & 0xFF;
 607                                 Demod.len++;
 608                                 Demod.output[Demod.len] = Demod.syncBit & 0xFF;
 609                                 Demod.len++;
 610                                 Demod.output[Demod.len] = 0xBB;
 611                                 Demod.len++;
 612                                 return TRUE;
 613                         }
 614
 615                 }
 616
 617         } // end (state != UNSYNCED)
 618
 619     return FALSE;
 620 }
 621
 622 //=============================================================================
 623 // Finally, a `sniffer' for iClass communication
 624 // Both sides of communication!
 625 //=============================================================================
 626
 627 //-----------------------------------------------------------------------------
 628 // Record the sequence of commands sent by the reader to the tag, with
 629 // triggering so that we start recording at the point that the tag is moved
 630 // near the reader.
 631 //-----------------------------------------------------------------------------
 632 void RAMFUNC SnoopIClass(void)
 633 {
 634
 635
 636     // We won't start recording the frames that we acquire until we trigger;
 637     // a good trigger condition to get started is probably when we see a
 638     // response from the tag.
 639     //int triggered = FALSE; // FALSE to wait first for card
 640
 641     // The command (reader -> tag) that we're receiving.
 642         // The length of a received command will in most cases be no more than 18 bytes.
 643         // So 32 should be enough!
 644         uint8_t *readerToTagCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
 645     // The response (tag -> reader) that we're receiving.
 646         uint8_t *tagToReaderResponse = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
 647
 648     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 649
 650     // reset traceLen to 0
 651     iso14a_set_tracing(TRUE);
 652     iso14a_clear_trace();
 653     iso14a_set_trigger(FALSE);
 654
 655     // The DMA buffer, used to stream samples from the FPGA
 656     int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
 657     int lastRxCounter;
 658     int8_t *upTo;
 659     int smpl;
 660     int maxBehindBy = 0;
 661
 662     // Count of samples received so far, so that we can include timing
 663     // information in the trace buffer.
 664     int samples = 0;
 665     rsamples = 0;
 666
 667     // Set up the demodulator for tag -> reader responses.
 668         Demod.output = tagToReaderResponse;
 669     Demod.len = 0;
 670     Demod.state = DEMOD_UNSYNCD;
 671
 672     // Setup for the DMA.
 673     FpgaSetupSsc();
 674     upTo = dmaBuf;
 675     lastRxCounter = DMA_BUFFER_SIZE;
 676     FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
 677
 678     // And the reader -> tag commands
 679     memset(&Uart, 0, sizeof(Uart));
 680         Uart.output = readerToTagCmd;
 681     Uart.byteCntMax = 32; // was 100 (greg)////////////////////////////////////////////////////////////////////////
 682     Uart.state = STATE_UNSYNCD;
 683
 684     // And put the FPGA in the appropriate mode
 685     // Signal field is off with the appropriate LED
 686     LED_D_OFF();
 687     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
 688     SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 689
 690         uint32_t time_0 = GetCountSspClk();
 691
 692
 693     int div = 0;
 694     //int div2 = 0;
 695     int decbyte = 0;
 696     int decbyter = 0;
 697
 698     // And now we loop, receiving samples.
 699     for(;;) {
 700         LED_A_ON();
 701         WDT_HIT();
 702         int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
 703                                 (DMA_BUFFER_SIZE-1);
 704         if(behindBy > maxBehindBy) {
 705             maxBehindBy = behindBy;
 706             if(behindBy > 400) {
 707                 Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
 708                 goto done;
 709             }
 710         }
 711         if(behindBy < 1) continue;
 712
 713         LED_A_OFF();
 714         smpl = upTo[0];
 715         upTo++;
 716         lastRxCounter -= 1;
 717         if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
 718             upTo -= DMA_BUFFER_SIZE;
 719             lastRxCounter += DMA_BUFFER_SIZE;
 720             AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
 721             AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
 722         }
 723
 724         //samples += 4;
 725         samples += 1;
 726
 727         if(smpl & 0xF) {
 728                 decbyte ^= (1 << (3 - div));
 729         }
 730
 731         // FOR READER SIDE COMMUMICATION...
 732
 733         decbyter <<= 2;
 734         decbyter ^= (smpl & 0x30);
 735
 736         div++;
 737
 738         if((div + 1) % 2 == 0) {
 739                 smpl = decbyter;
 740                 if(OutOfNDecoding((smpl & 0xF0) >> 4)) {
 741                     rsamples = samples - Uart.samples;
 742                     LED_C_ON();
 743
 744                         //if(!LogTrace(Uart.output,Uart.byteCnt, rsamples, Uart.parityBits,TRUE)) break;
 745                         //if(!LogTrace(NULL, 0, Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, 0, TRUE)) break;
 746                         if(tracing)     {
 747                                 uint8_t parity[MAX_PARITY_SIZE];
 748                                 GetParity(Uart.output, Uart.byteCnt, parity);
 749                                 LogTrace(Uart.output,Uart.byteCnt, (GetCountSspClk()-time_0) << 4, (GetCountSspClk()-time_0) << 4, parity, TRUE);
 750                         }
 751
 752
 753                         /* And ready to receive another command. */
 754                     Uart.state = STATE_UNSYNCD;
 755                     /* And also reset the demod code, which might have been */
 756                     /* false-triggered by the commands from the reader. */
 757                     Demod.state = DEMOD_UNSYNCD;
 758                     LED_B_OFF();
 759                     Uart.byteCnt = 0;
 760                 }
 761                 decbyter = 0;
 762         }
 763
 764         if(div > 3) {
 765                 smpl = decbyte;
 766                 if(ManchesterDecoding(smpl & 0x0F)) {
 767                     rsamples = samples - Demod.samples;
 768                     LED_B_ON();
 769
 770                         if(tracing)     {
 771                                 uint8_t parity[MAX_PARITY_SIZE];
 772                                 GetParity(Demod.output, Demod.len, parity);
 773                                 LogTrace(Demod.output, Demod.len, (GetCountSspClk()-time_0) << 4, (GetCountSspClk()-time_0) << 4, parity, FALSE);
 774                         }
 775
 776
 777                     // And ready to receive another response.
 778                     memset(&Demod, 0, sizeof(Demod));
 779                         Demod.output = tagToReaderResponse;
 780                     Demod.state = DEMOD_UNSYNCD;
 781                     LED_C_OFF();
 782                 }
 783
 784                 div = 0;
 785                 decbyte = 0x00;
 786         }
 787         //}
 788
 789         if(BUTTON_PRESS()) {
 790             DbpString("cancelled_a");
 791             goto done;
 792         }
 793     }
 794
 795     DbpString("COMMAND FINISHED");
 796
 797     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
 798     Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
 799
 800 done:
 801     AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
 802     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
 803     Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
 804     LED_A_OFF();
 805     LED_B_OFF();
 806     LED_C_OFF();
 807     LED_D_OFF();
 808 }
 809
 810 void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {
 811         int i;
 812         for(i = 0; i < 8; i++) {
 813                 rotatedCSN[i] = (originalCSN[i] >> 3) | (originalCSN[(i+1)%8] << 5);
 814         }
 815 }
 816
 817 //-----------------------------------------------------------------------------
 818 // Wait for commands from reader
 819 // Stop when button is pressed
 820 // Or return TRUE when command is captured
 821 //-----------------------------------------------------------------------------
 822 static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
 823 {
 824     // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen
 825     // only, since we are receiving, not transmitting).
 826     // Signal field is off with the appropriate LED
 827     LED_D_OFF();
 828     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
 829
 830     // Now run a `software UART' on the stream of incoming samples.
 831     Uart.output = received;
 832     Uart.byteCntMax = maxLen;
 833     Uart.state = STATE_UNSYNCD;
 834
 835     for(;;) {
 836         WDT_HIT();
 837
 838         if(BUTTON_PRESS()) return FALSE;
 839
 840         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
 841             AT91C_BASE_SSC->SSC_THR = 0x00;
 842         }
 843         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
 844             uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
 845                         /*if(OutOfNDecoding((b & 0xf0) >> 4)) {
 846                                 *len = Uart.byteCnt;
 847                                 return TRUE;
 848                         }*/
 849                         if(OutOfNDecoding(b & 0x0f)) {
 850                                 *len = Uart.byteCnt;
 851                                 return TRUE;
 852                         }
 853         }
 854     }
 855 }
 856
 857
 858 //-----------------------------------------------------------------------------
 859 // Prepare tag messages
 860 //-----------------------------------------------------------------------------
 861 static void CodeIClassTagAnswer(const uint8_t *cmd, int len)
 862 {
 863         //So far a dummy implementation, not used
 864         //int lastProxToAirDuration =0;
 865         int i;
 866
 867         ToSendReset();
 868
 869         // Send SOF
 870         ToSend[++ToSendMax] = 0x00;
 871         ToSend[++ToSendMax] = 0x00;
 872         ToSend[++ToSendMax] = 0x00;
 873         ToSend[++ToSendMax] = 0xff;//Proxtoair duration starts here
 874         ToSend[++ToSendMax] = 0xff;
 875         ToSend[++ToSendMax] = 0xff;
 876         ToSend[++ToSendMax] = 0x00;
 877         ToSend[++ToSendMax] = 0xff;
 878
 879         for(i = 0; i < len; i++) {
 880                 int j;
 881                 uint8_t b = cmd[i];
 882
 883                 // Data bits
 884                 for(j = 0; j < 8; j++) {
 885                         if(b & 1) {
 886                                 ToSend[++ToSendMax] = 0x00;
 887                                 ToSend[++ToSendMax] = 0xff;
 888                         } else {
 889                                 ToSend[++ToSendMax] = 0xff;
 890                                 ToSend[++ToSendMax] = 0x00;
 891                         }
 892                         b >>= 1;
 893                 }
 894         }
 895
 896         // Send EOF
 897         ToSend[++ToSendMax] = 0xff;
 898         ToSend[++ToSendMax] = 0x00;
 899         ToSend[++ToSendMax] = 0xff;
 900         ToSend[++ToSendMax] = 0xff;
 901         ToSend[++ToSendMax] = 0xff;
 902         ToSend[++ToSendMax] = 0x00;
 903         ToSend[++ToSendMax] = 0x00;
 904         ToSend[++ToSendMax] = 0x00;
 905
 906         //lastProxToAirDuration  = 8*ToSendMax - 3*8 - 3*8;//Not counting zeroes in the beginning or end
 907
 908         // Convert from last byte pos to length
 909         ToSendMax++;
 910 }
 911
 912 // Only SOF
 913 static void CodeIClassTagSOF()
 914 {
 915         //So far a dummy implementation, not used
 916         //int lastProxToAirDuration =0;
 917
 918         ToSendReset();
 919         // Send SOF
 920         ToSend[++ToSendMax] = 0x00;
 921         ToSend[++ToSendMax] = 0x00;
 922         ToSend[++ToSendMax] = 0x00;
 923         ToSend[++ToSendMax] = 0xff;
 924         ToSend[++ToSendMax] = 0xff;
 925         ToSend[++ToSendMax] = 0xff;
 926         ToSend[++ToSendMax] = 0x00;
 927         ToSend[++ToSendMax] = 0xff;
 928
 929 //      lastProxToAirDuration  = 8*ToSendMax - 3*8;//Not counting zeroes in the beginning
 930
 931
 932         // Convert from last byte pos to length
 933         ToSendMax++;
 934 }
 935 int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf);
 936 /**
 937  * @brief SimulateIClass simulates an iClass card.
 938  * @param arg0 type of simulation
 939  *                      - 0 uses the first 8 bytes in usb data as CSN
 940  *                      - 2 "dismantling iclass"-attack. This mode iterates through all CSN's specified
 941  *                      in the usb data. This mode collects MAC from the reader, in order to do an offline
 942  *                      attack on the keys. For more info, see "dismantling iclass" and proxclone.com.
 943  *                      - Other : Uses the default CSN (031fec8af7ff12e0)
 944  * @param arg1 - number of CSN's contained in datain (applicable for mode 2 only)
 945  * @param arg2
 946  * @param datain
 947  */
 948 void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain)
 949 {
 950         uint32_t simType = arg0;
 951         uint32_t numberOfCSNS = arg1;
 952         FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 953
 954         // Enable and clear the trace
 955         iso14a_set_tracing(TRUE);
 956         iso14a_clear_trace();
 957
 958         uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
 959         if(simType == 0) {
 960                 // Use the CSN from commandline
 961                 memcpy(csn_crc, datain, 8);
 962                 doIClassSimulation(csn_crc,0,NULL);
 963         }else if(simType == 1)
 964         {
 965                 doIClassSimulation(csn_crc,0,NULL);
 966         }
 967         else if(simType == 2)
 968         {
 969
 970                 uint8_t mac_responses[64] = { 0 };
 971                 Dbprintf("Going into attack mode, %d CSNS sent", numberOfCSNS);
 972                 // In this mode, a number of csns are within datain. We'll simulate each one, one at a time
 973                 // in order to collect MAC's from the reader. This can later be used in an offlne-attack
 974                 // in order to obtain the keys, as in the "dismantling iclass"-paper.
 975                 int i = 0;
 976                 for( ; i < numberOfCSNS && i*8+8 < USB_CMD_DATA_SIZE; i++)
 977                 {
 978                         // The usb data is 512 bytes, fitting 65 8-byte CSNs in there.
 979
 980                         memcpy(csn_crc, datain+(i*8), 8);
 981                         if(doIClassSimulation(csn_crc,1,mac_responses+i*8))
 982                         {
 983                                 return; // Button pressed
 984                         }
 985                 }
 986                 cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);
 987
 988         }
 989         else{
 990                 // We may want a mode here where we hardcode the csns to use (from proxclone).
 991                 // That will speed things up a little, but not required just yet.
 992                 Dbprintf("The mode is not implemented, reserved for future use");
 993         }
 994         Dbprintf("Done...");
 995
 996 }
 997 /**
 998  * @brief Does the actual simulation
 999  * @param csn - csn to use
1000  * @param breakAfterMacReceived if true, returns after reader MAC has been received.
1001  */
1002 int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf)
1003 {
1004
1005
1006         // CSN followed by two CRC bytes
1007         uint8_t response2[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1008         uint8_t response3[] = { 0,0,0,0,0,0,0,0,0,0};
1009         memcpy(response3,csn,sizeof(response3));
1010         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]);
1011         // e-Purse
1012         uint8_t response4[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1013
1014         // Construct anticollision-CSN
1015         rotateCSN(response3,response2);
1016
1017         // Compute CRC on both CSNs
1018         ComputeCrc14443(CRC_ICLASS, response2, 8, &response2[8], &response2[9]);
1019         ComputeCrc14443(CRC_ICLASS, response3, 8, &response3[8], &response3[9]);
1020
1021         int exitLoop = 0;
1022         // Reader 0a
1023         // Tag    0f
1024         // Reader 0c
1025         // Tag    anticoll. CSN
1026         // Reader 81 anticoll. CSN
1027         // Tag    CSN
1028
1029         uint8_t *resp;
1030         int respLen;
1031         uint8_t* respdata = NULL;
1032         int respsize = 0;
1033         uint8_t sof = 0x0f;
1034
1035         // Respond SOF -- takes 8 bytes
1036         uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
1037         int resp1Len;
1038
1039         // Anticollision CSN (rotated CSN)
1040         // 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit)
1041         uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 10);
1042         int resp2Len;
1043
1044         // CSN
1045         // 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit)
1046         uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 190);
1047         int resp3Len;
1048
1049         // e-Purse
1050         // 144: Takes 16 bytes for SOF/EOF and 8 * 16 = 128 bytes (2 bytes/bit)
1051         uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 370);
1052         int resp4Len;
1053
1054         // + 1720..
1055         uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
1056         memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
1057         int len;
1058
1059         // Prepare card messages
1060         ToSendMax = 0;
1061
1062         // First card answer: SOF
1063         CodeIClassTagSOF();
1064         memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
1065
1066         // Anticollision CSN
1067         CodeIClassTagAnswer(response2, sizeof(response2));
1068         memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax;
1069
1070         // CSN
1071         CodeIClassTagAnswer(response3, sizeof(response3));
1072         memcpy(resp3, ToSend, ToSendMax); resp3Len = ToSendMax;
1073
1074         // e-Purse
1075         CodeIClassTagAnswer(response4, sizeof(response4));
1076         memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax;
1077
1078
1079         // Start from off (no field generated)
1080         //FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1081         //SpinDelay(200);
1082         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
1083         SpinDelay(100);
1084         StartCountSspClk();
1085         // We need to listen to the high-frequency, peak-detected path.
1086         SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1087         FpgaSetupSsc();
1088
1089         // To control where we are in the protocol
1090         int cmdsRecvd = 0;
1091         uint32_t time_0 = GetCountSspClk();
1092         uint32_t t2r_time =0;
1093         uint32_t r2t_time =0;
1094
1095         LED_A_ON();
1096         bool buttonPressed = false;
1097
1098         /** Hack  for testing
1099         memcpy(reader_mac_buf,csn,8);
1100         exitLoop = true;
1101         end hack **/
1102
1103         while(!exitLoop) {
1104
1105                 LED_B_OFF();
1106                 //Signal tracer
1107                 // Can be used to get a trigger for an oscilloscope..
1108                 LED_C_OFF();
1109                 if(!GetIClassCommandFromReader(receivedCmd, &len, 100)) {
1110                         buttonPressed = true;
1111                         break;
1112                 }
1113                 r2t_time = GetCountSspClk();
1114                 //Signal tracer
1115                 LED_C_ON();
1116
1117                 // Okay, look at the command now.
1118                 if(receivedCmd[0] == 0x0a ) {
1119                         // Reader in anticollission phase
1120                         resp = resp1; respLen = resp1Len; //order = 1;
1121                         respdata = &sof;
1122                         respsize = sizeof(sof);
1123                 } else if(receivedCmd[0] == 0x0c) {
1124                         // Reader asks for anticollission CSN
1125                         resp = resp2; respLen = resp2Len; //order = 2;
1126                         respdata = response2;
1127                         respsize = sizeof(response2);
1128                         //DbpString("Reader requests anticollission CSN:");
1129                 } else if(receivedCmd[0] == 0x81) {
1130                         // Reader selects anticollission CSN.
1131                         // Tag sends the corresponding real CSN
1132                         resp = resp3; respLen = resp3Len; //order = 3;
1133                         respdata = response3;
1134                         respsize = sizeof(response3);
1135                         //DbpString("Reader selects anticollission CSN:");
1136                 } else if(receivedCmd[0] == 0x88) {
1137                         // Read e-purse (88 02)
1138                         resp = resp4; respLen = resp4Len; //order = 4;
1139                         respdata = response4;
1140                         respsize = sizeof(response4);
1141                         LED_B_ON();
1142                 } else if(receivedCmd[0] == 0x05) {
1143                         // Reader random and reader MAC!!!
1144                         // Do not respond
1145             // We do not know what to answer, so lets keep quiet
1146                         resp = resp1; respLen = 0; //order = 5;
1147                         respdata = NULL;
1148                         respsize = 0;
1149                         if (breakAfterMacReceived){
1150                                 // dbprintf:ing ...
1151                                 Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x"
1152                                                    ,csn[0],csn[1],csn[2],csn[3],csn[4],csn[5],csn[6],csn[7]);
1153                                 Dbprintf("RDR:  (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",len,
1154                                                 receivedCmd[0], receivedCmd[1], receivedCmd[2],
1155                                                 receivedCmd[3], receivedCmd[4], receivedCmd[5],
1156                                                 receivedCmd[6], receivedCmd[7], receivedCmd[8]);
1157                                 if (reader_mac_buf != NULL)
1158                                 {
1159                                         memcpy(reader_mac_buf,receivedCmd+1,8);
1160                                 }
1161                                 exitLoop = true;
1162                         }
1163                 } else if(receivedCmd[0] == 0x00 && len == 1) {
1164                         // Reader ends the session
1165                         resp = resp1; respLen = 0; //order = 0;
1166                         respdata = NULL;
1167                         respsize = 0;
1168                 } else {
1169                         //#db# Unknown command received from reader (len=5): 26 1 0 f6 a 44 44 44 44
1170                         // Never seen this command before
1171                         Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x",
1172                         len,
1173                         receivedCmd[0], receivedCmd[1], receivedCmd[2],
1174                         receivedCmd[3], receivedCmd[4], receivedCmd[5],
1175                         receivedCmd[6], receivedCmd[7], receivedCmd[8]);
1176                         // Do not respond
1177                         resp = resp1; respLen = 0; //order = 0;
1178                         respdata = NULL;
1179                         respsize = 0;
1180                 }
1181
1182                 if(cmdsRecvd >  100) {
1183                         //DbpString("100 commands later...");
1184                         //break;
1185                 }
1186                 else {
1187                         cmdsRecvd++;
1188                 }
1189
1190                 if(respLen > 0) {
1191                         SendIClassAnswer(resp, respLen, 21);
1192                         t2r_time = GetCountSspClk();
1193                 }
1194
1195                 if (tracing) {
1196                         uint8_t parity[MAX_PARITY_SIZE];
1197                         GetParity(receivedCmd, len, parity);
1198                         LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, (r2t_time-time_0) << 4, parity, TRUE);
1199
1200                         if (respdata != NULL) {
1201                                 GetParity(respdata, respsize, parity);
1202                                 LogTrace(respdata, respsize, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, FALSE);
1203                         }
1204                         if(!tracing) {
1205                                 DbpString("Trace full");
1206                                 //break;
1207                         }
1208
1209                 }
1210                 memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
1211         }
1212
1213         //Dbprintf("%x", cmdsRecvd);
1214         LED_A_OFF();
1215         LED_B_OFF();
1216         if(buttonPressed)
1217         {
1218                 DbpString("Button pressed");
1219         }
1220         return buttonPressed;
1221 }
1222
1223 static int SendIClassAnswer(uint8_t *resp, int respLen, int delay)
1224 {
1225         int i = 0, d=0;//, u = 0, d = 0;
1226         uint8_t b = 0;
1227
1228         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
1229
1230         AT91C_BASE_SSC->SSC_THR = 0x00;
1231         FpgaSetupSsc();
1232         while(!BUTTON_PRESS()) {
1233                 if((AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)){
1234                         b = AT91C_BASE_SSC->SSC_RHR; (void) b;
1235                 }
1236                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)){
1237                         b = 0x00;
1238                         if(d < delay) {
1239                                 d++;
1240                         }
1241                         else {
1242                                 if( i < respLen){
1243                                         b = resp[i];
1244                                         //Hack
1245                                         //b = 0xAC;
1246                                 }
1247                                 i++;
1248                         }
1249                         AT91C_BASE_SSC->SSC_THR = b;
1250                 }
1251
1252                 if (i > respLen +4) break;
1253         }
1254
1255         return 0;
1256 }
1257
1258 /// THE READER CODE
1259
1260 //-----------------------------------------------------------------------------
1261 // Transmit the command (to the tag) that was placed in ToSend[].
1262 //-----------------------------------------------------------------------------
1263 static void TransmitIClassCommand(const uint8_t *cmd, int len, int *samples, int *wait)
1264 {
1265   int c;
1266   FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1267   AT91C_BASE_SSC->SSC_THR = 0x00;
1268   FpgaSetupSsc();
1269
1270    if (wait)
1271    {
1272      if(*wait < 10) *wait = 10;
1273
1274      for(c = 0; c < *wait;) {
1275        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1276          AT91C_BASE_SSC->SSC_THR = 0x00;                // For exact timing!
1277          c++;
1278        }
1279        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1280          volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
1281          (void)r;
1282        }
1283        WDT_HIT();
1284      }
1285
1286    }
1287
1288
1289   uint8_t sendbyte;
1290   bool firstpart = TRUE;
1291   c = 0;
1292   for(;;) {
1293     if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1294
1295       // DOUBLE THE SAMPLES!
1296       if(firstpart) {
1297         sendbyte = (cmd[c] & 0xf0) | (cmd[c] >> 4);
1298       }
1299       else {
1300         sendbyte = (cmd[c] & 0x0f) | (cmd[c] << 4);
1301         c++;
1302       }
1303       if(sendbyte == 0xff) {
1304         sendbyte = 0xfe;
1305       }
1306       AT91C_BASE_SSC->SSC_THR = sendbyte;
1307       firstpart = !firstpart;
1308
1309       if(c >= len) {
1310         break;
1311       }
1312     }
1313     if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1314       volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
1315       (void)r;
1316     }
1317     WDT_HIT();
1318   }
1319   if (samples) *samples = (c + *wait) << 3;
1320 }
1321
1322
1323 //-----------------------------------------------------------------------------
1324 // Prepare iClass reader command to send to FPGA
1325 //-----------------------------------------------------------------------------
1326 void CodeIClassCommand(const uint8_t * cmd, int len)
1327 {
1328   int i, j, k;
1329   uint8_t b;
1330
1331   ToSendReset();
1332
1333   // Start of Communication: 1 out of 4
1334   ToSend[++ToSendMax] = 0xf0;
1335   ToSend[++ToSendMax] = 0x00;
1336   ToSend[++ToSendMax] = 0x0f;
1337   ToSend[++ToSendMax] = 0x00;
1338
1339   // Modulate the bytes
1340   for (i = 0; i < len; i++) {
1341     b = cmd[i];
1342     for(j = 0; j < 4; j++) {
1343       for(k = 0; k < 4; k++) {
1344                         if(k == (b & 3)) {
1345                                 ToSend[++ToSendMax] = 0x0f;
1346                         }
1347                         else {
1348                                 ToSend[++ToSendMax] = 0x00;
1349                         }
1350       }
1351       b >>= 2;
1352     }
1353   }
1354
1355   // End of Communication
1356   ToSend[++ToSendMax] = 0x00;
1357   ToSend[++ToSendMax] = 0x00;
1358   ToSend[++ToSendMax] = 0xf0;
1359   ToSend[++ToSendMax] = 0x00;
1360
1361   // Convert from last character reference to length
1362   ToSendMax++;
1363 }
1364
1365 void ReaderTransmitIClass(uint8_t* frame, int len)
1366 {
1367         int wait = 0;
1368         int samples = 0;
1369
1370         // This is tied to other size changes
1371         //      uint8_t* frame_addr = ((uint8_t*)BigBuf) + 2024;
1372         CodeIClassCommand(frame,len);
1373
1374         // Select the card
1375         TransmitIClassCommand(ToSend, ToSendMax, &samples, &wait);
1376         if(trigger)
1377                 LED_A_ON();
1378
1379         // Store reader command in buffer
1380         if (tracing) {
1381                 uint8_t par[MAX_PARITY_SIZE];
1382                 GetParity(frame, len, par);
1383                 LogTrace(frame, len, rsamples, rsamples, par, TRUE);
1384         }
1385 }
1386
1387 //-----------------------------------------------------------------------------
1388 // Wait a certain time for tag response
1389 //  If a response is captured return TRUE
1390 //  If it takes too long return FALSE
1391 //-----------------------------------------------------------------------------
1392 static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) //uint8_t *buffer
1393 {
1394         // buffer needs to be 512 bytes
1395         int c;
1396
1397         // Set FPGA mode to "reader listen mode", no modulation (listen
1398         // only, since we are receiving, not transmitting).
1399         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN);
1400
1401         // Now get the answer from the card
1402         Demod.output = receivedResponse;
1403         Demod.len = 0;
1404         Demod.state = DEMOD_UNSYNCD;
1405
1406         uint8_t b;
1407         if (elapsed) *elapsed = 0;
1408
1409         bool skip = FALSE;
1410
1411         c = 0;
1412         for(;;) {
1413                 WDT_HIT();
1414
1415                 if(BUTTON_PRESS()) return FALSE;
1416
1417                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1418                         AT91C_BASE_SSC->SSC_THR = 0x00;  // To make use of exact timing of next command from reader!!
1419                         if (elapsed) (*elapsed)++;
1420                 }
1421                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1422                         if(c < timeout) { c++; } else { return FALSE; }
1423                         b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
1424                         skip = !skip;
1425                         if(skip) continue;
1426                         /*if(ManchesterDecoding((b>>4) & 0xf)) {
1427                                 *samples = ((c - 1) << 3) + 4;
1428                                 return TRUE;
1429                         }*/
1430                         if(ManchesterDecoding(b & 0x0f)) {
1431                                 *samples = c << 3;
1432                                 return  TRUE;
1433                         }
1434                 }
1435         }
1436 }
1437
1438 int ReaderReceiveIClass(uint8_t* receivedAnswer)
1439 {
1440   int samples = 0;
1441   if (!GetIClassAnswer(receivedAnswer,160,&samples,0)) return FALSE;
1442   rsamples += samples;
1443   if (tracing) {
1444         uint8_t parity[MAX_PARITY_SIZE];
1445         GetParity(receivedAnswer, Demod.len, parity);
1446         LogTrace(receivedAnswer,Demod.len,rsamples,rsamples,parity,FALSE);
1447   }
1448   if(samples == 0) return FALSE;
1449   return Demod.len;
1450 }
1451
1452 void setupIclassReader()
1453 {
1454     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
1455     // Reset trace buffer
1456     iso14a_set_tracing(TRUE);
1457     iso14a_clear_trace();
1458
1459     // Setup SSC
1460     FpgaSetupSsc();
1461     // Start from off (no field generated)
1462     // Signal field is off with the appropriate LED
1463     LED_D_OFF();
1464     FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1465     SpinDelay(200);
1466
1467     SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1468
1469     // Now give it time to spin up.
1470     // Signal field is on with the appropriate LED
1471     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1472     SpinDelay(200);
1473     LED_A_ON();
1474
1475 }
1476
1477 // Reader iClass Anticollission
1478 void ReaderIClass(uint8_t arg0) {
1479     uint8_t act_all[]     = { 0x0a };
1480     uint8_t identify[]    = { 0x0c };
1481     uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1482     uint8_t readcheck_cc[]= { 0x88, 0x02 };
1483
1484     uint8_t card_data[24]={0};
1485     uint8_t last_csn[8]={0};
1486
1487     uint8_t *resp = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
1488
1489     int read_status= 0;
1490     bool abort_after_read = arg0 & FLAG_ICLASS_READER_ONLY_ONCE;
1491
1492     setupIclassReader();
1493
1494     size_t datasize = 0;
1495     while(!BUTTON_PRESS())
1496     {
1497         WDT_HIT();
1498
1499         // Send act_all
1500         ReaderTransmitIClass(act_all, 1);
1501         // Card present?
1502         if(ReaderReceiveIClass(resp)) {
1503
1504             ReaderTransmitIClass(identify, 1);
1505
1506             if(ReaderReceiveIClass(resp) == 10) {
1507                 //Copy the Anti-collision CSN to our select-packet
1508                 memcpy(&select[1],resp,8);
1509                 //Dbprintf("Anti-collision CSN: %02x %02x %02x %02x %02x %02x %02x %02x",resp[0], resp[1], resp[2],
1510                 //        resp[3], resp[4], resp[5],
1511                 //        resp[6], resp[7]);
1512                 //Select the card
1513                 ReaderTransmitIClass(select, sizeof(select));
1514
1515                 if(ReaderReceiveIClass(resp) == 10) {
1516                     //Save CSN in response data
1517                     memcpy(card_data,resp,8);
1518                     datasize += 8;
1519                     //Flag that we got to at least stage 1, read CSN
1520                     read_status = 1;
1521
1522                     // Card selected
1523                     //Dbprintf("Readcheck on Sector 2");
1524                     ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
1525                     if(ReaderReceiveIClass(resp) == 8) {
1526                         //Save CC (e-purse) in response data
1527                         memcpy(card_data+8,resp,8);
1528                         datasize += 8;
1529                         //Got both
1530                         read_status = 2;
1531                     }
1532
1533                     LED_B_ON();
1534                     //Send back to client, but don't bother if we already sent this
1535                     if(memcmp(last_csn, card_data, 8) != 0)
1536                         cmd_send(CMD_ACK,read_status,0,0,card_data,datasize);
1537
1538                     //Save that we already sent this....
1539                     if(read_status ==  2)
1540                         memcpy(last_csn, card_data, 8);
1541
1542                     LED_B_OFF();
1543
1544                     if(abort_after_read) break;
1545                 }
1546             }
1547         }
1548
1549         if(traceLen > TRACE_SIZE) {
1550             DbpString("Trace full");
1551             break;
1552         }
1553     }
1554     LED_A_OFF();
1555 }
1556
1557 void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
1558         uint8_t act_all[]     = { 0x0a };
1559         uint8_t identify[]    = { 0x0c };
1560         uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1561         uint8_t readcheck_cc[]= { 0x88, 0x02 };
1562         uint8_t check[]       = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1563         uint8_t read[]        = { 0x0c, 0x00, 0x00, 0x00 };
1564
1565     uint16_t crc = 0;
1566         uint8_t cardsize=0;
1567         bool read_success=false;
1568         uint8_t mem=0;
1569
1570         static struct memory_t{
1571           int k16;
1572           int book;
1573           int k2;
1574           int lockauth;
1575           int keyaccess;
1576         } memory;
1577
1578         uint8_t* resp = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
1579
1580     setupIclassReader();
1581
1582
1583         for(int i=0;i<1;i++) {
1584
1585                 if(traceLen > TRACE_SIZE) {
1586                         DbpString("Trace full");
1587                         break;
1588                 }
1589
1590                 if (BUTTON_PRESS()) break;
1591
1592                 // Send act_all
1593                 ReaderTransmitIClass(act_all, 1);
1594                 // Card present?
1595                 if(ReaderReceiveIClass(resp)) {
1596                         ReaderTransmitIClass(identify, 1);
1597                         if(ReaderReceiveIClass(resp) == 10) {
1598                                 // Select card
1599                                 memcpy(&select[1],resp,8);
1600                                 ReaderTransmitIClass(select, sizeof(select));
1601
1602                                 if(ReaderReceiveIClass(resp) == 10) {
1603                                         Dbprintf("     Selected CSN: %02x %02x %02x %02x %02x %02x %02x %02x",
1604                                         resp[0], resp[1], resp[2],
1605                                         resp[3], resp[4], resp[5],
1606                                         resp[6], resp[7]);
1607                                 }
1608                                 // Card selected
1609                                 Dbprintf("Readcheck on Sector 2");
1610                                 ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
1611                                 if(ReaderReceiveIClass(resp) == 8) {
1612                                    Dbprintf("     CC: %02x %02x %02x %02x %02x %02x %02x %02x",
1613                                         resp[0], resp[1], resp[2],
1614                                         resp[3], resp[4], resp[5],
1615                                         resp[6], resp[7]);
1616                                 }else return;
1617                                 Dbprintf("Authenticate");
1618                                 //for now replay captured auth (as cc not updated)
1619                                 memcpy(check+5,MAC,4);
1620                 //Dbprintf("     AA: %02x %02x %02x %02x",
1621                 //      check[5], check[6], check[7],check[8]);
1622                                 ReaderTransmitIClass(check, sizeof(check));
1623                                 if(ReaderReceiveIClass(resp) == 4) {
1624                                    Dbprintf("     AR: %02x %02x %02x %02x",
1625                                         resp[0], resp[1], resp[2],resp[3]);
1626                                 }else {
1627                                   Dbprintf("Error: Authentication Fail!");
1628                                   return;
1629                                 }
1630                                 Dbprintf("Dump Contents");
1631                                 //first get configuration block
1632                                 read_success=false;
1633                                 read[1]=1;
1634                                 uint8_t *blockno=&read[1];
1635                                 crc = iclass_crc16((char *)blockno,1);
1636                                 read[2] = crc >> 8;
1637                                 read[3] = crc & 0xff;
1638                                 while(!read_success){
1639                                       ReaderTransmitIClass(read, sizeof(read));
1640                                       if(ReaderReceiveIClass(resp) == 10) {
1641                                          read_success=true;
1642                                          mem=resp[5];
1643                                          memory.k16= (mem & 0x80);
1644                                          memory.book= (mem & 0x20);
1645                                          memory.k2= (mem & 0x8);
1646                                          memory.lockauth= (mem & 0x2);
1647                                          memory.keyaccess= (mem & 0x1);
1648
1649                                       }
1650                                 }
1651                                 if (memory.k16){
1652                                   cardsize=255;
1653                                 }else cardsize=32;
1654                                 //then loop around remaining blocks
1655                                 for(uint8_t j=0; j<cardsize; j++){
1656                                     read_success=false;
1657                                     uint8_t *blockno=&j;
1658                                     //crc_data[0]=j;
1659                                     read[1]=j;
1660                                     crc = iclass_crc16((char *)blockno,1);
1661                                     read[2] = crc >> 8;
1662                                     read[3] = crc & 0xff;
1663                                     while(!read_success){
1664                                       ReaderTransmitIClass(read, sizeof(read));
1665                                       if(ReaderReceiveIClass(resp) == 10) {
1666                                          read_success=true;
1667                                          Dbprintf("     %02x: %02x %02x %02x %02x %02x %02x %02x %02x",
1668                                           j, resp[0], resp[1], resp[2],
1669                                           resp[3], resp[4], resp[5],
1670                                           resp[6], resp[7]);
1671                                       }
1672                                     }
1673                                 }
1674                         }
1675                 }
1676                 WDT_HIT();
1677         }
1678
1679         LED_A_OFF();
1680 }
1681
1682 //2. Create Read method (cut-down from above) based off responses from 1.
1683 //   Since we have the MAC could continue to use replay function.
1684 //3. Create Write method
1685 /*
1686 void IClass_iso14443A_write(uint8_t arg0, uint8_t blockNo, uint8_t *data, uint8_t *MAC) {
1687         uint8_t act_all[]     = { 0x0a };
1688         uint8_t identify[]    = { 0x0c };
1689         uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1690         uint8_t readcheck_cc[]= { 0x88, 0x02 };
1691         uint8_t check[]       = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1692         uint8_t read[]        = { 0x0c, 0x00, 0x00, 0x00 };
1693         uint8_t write[]       = { 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1694
1695     uint16_t crc = 0;
1696
1697         uint8_t* resp = (((uint8_t *)BigBuf) + 3560);
1698
1699         // Reset trace buffer
1700     memset(trace, 0x44, RECV_CMD_OFFSET);
1701         traceLen = 0;
1702
1703         // Setup SSC
1704         FpgaSetupSsc();
1705         // Start from off (no field generated)
1706         // Signal field is off with the appropriate LED
1707         LED_D_OFF();
1708         FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1709         SpinDelay(200);
1710
1711         SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1712
1713         // Now give it time to spin up.
1714         // Signal field is on with the appropriate LED
1715         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1716         SpinDelay(200);
1717
1718         LED_A_ON();
1719
1720         for(int i=0;i<1;i++) {
1721
1722                 if(traceLen > TRACE_SIZE) {
1723                         DbpString("Trace full");
1724                         break;
1725                 }
1726
1727                 if (BUTTON_PRESS()) break;
1728
1729                 // Send act_all
1730                 ReaderTransmitIClass(act_all, 1);
1731                 // Card present?
1732                 if(ReaderReceiveIClass(resp)) {
1733                         ReaderTransmitIClass(identify, 1);
1734                         if(ReaderReceiveIClass(resp) == 10) {
1735                                 // Select card
1736                                 memcpy(&select[1],resp,8);
1737                                 ReaderTransmitIClass(select, sizeof(select));
1738
1739                                 if(ReaderReceiveIClass(resp) == 10) {
1740                                         Dbprintf("     Selected CSN: %02x %02x %02x %02x %02x %02x %02x %02x",
1741                                         resp[0], resp[1], resp[2],
1742                                         resp[3], resp[4], resp[5],
1743                                         resp[6], resp[7]);
1744                                 }
1745                                 // Card selected
1746                                 Dbprintf("Readcheck on Sector 2");
1747                                 ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
1748                                 if(ReaderReceiveIClass(resp) == 8) {
1749                                    Dbprintf("     CC: %02x %02x %02x %02x %02x %02x %02x %02x",
1750                                         resp[0], resp[1], resp[2],
1751                                         resp[3], resp[4], resp[5],
1752                                         resp[6], resp[7]);
1753                                 }else return;
1754                                 Dbprintf("Authenticate");
1755                                 //for now replay captured auth (as cc not updated)
1756                                 memcpy(check+5,MAC,4);
1757                                 Dbprintf("     AA: %02x %02x %02x %02x",
1758                                         check[5], check[6], check[7],check[8]);
1759                                 ReaderTransmitIClass(check, sizeof(check));
1760                                 if(ReaderReceiveIClass(resp) == 4) {
1761                                    Dbprintf("     AR: %02x %02x %02x %02x",
1762                                         resp[0], resp[1], resp[2],resp[3]);
1763                                 }else {
1764                                   Dbprintf("Error: Authentication Fail!");
1765                                   return;
1766                                 }
1767                                 Dbprintf("Write Block");
1768
1769                                 //read configuration for max block number
1770                                 read_success=false;
1771                                 read[1]=1;
1772                                 uint8_t *blockno=&read[1];
1773                                 crc = iclass_crc16((char *)blockno,1);
1774                                 read[2] = crc >> 8;
1775                                 read[3] = crc & 0xff;
1776                                 while(!read_success){
1777                                       ReaderTransmitIClass(read, sizeof(read));
1778                                       if(ReaderReceiveIClass(resp) == 10) {
1779                                          read_success=true;
1780                                          mem=resp[5];
1781                                          memory.k16= (mem & 0x80);
1782                                          memory.book= (mem & 0x20);
1783                                          memory.k2= (mem & 0x8);
1784                                          memory.lockauth= (mem & 0x2);
1785                                          memory.keyaccess= (mem & 0x1);
1786
1787                                       }
1788                                 }
1789                                 if (memory.k16){
1790                                   cardsize=255;
1791                                 }else cardsize=32;
1792                                 //check card_size
1793
1794                                 memcpy(write+1,blockNo,1);
1795                                 memcpy(write+2,data,8);
1796                                 memcpy(write+10,mac,4);
1797                                 while(!send_success){
1798                                   ReaderTransmitIClass(write, sizeof(write));
1799                                   if(ReaderReceiveIClass(resp) == 10) {
1800                                     write_success=true;
1801                                 }
1802                         }//
1803                 }
1804                 WDT_HIT();
1805         }
1806
1807         LED_A_OFF();
1808 }*/