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         #define ICLASS_BUFFER_SIZE 32
 644         uint8_t readerToTagCmd[ICLASS_BUFFER_SIZE];
 645     // The response (tag -> reader) that we're receiving.
 646         uint8_t tagToReaderResponse[ICLASS_BUFFER_SIZE];
 647
 648     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 649
 650         // free all BigBuf memory
 651         BigBuf_free();
 652     // The DMA buffer, used to stream samples from the FPGA
 653     uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
 654
 655         set_tracing(TRUE);
 656         clear_trace();
 657     iso14a_set_trigger(FALSE);
 658
 659         int lastRxCounter;
 660     uint8_t *upTo;
 661     int smpl;
 662     int maxBehindBy = 0;
 663
 664     // Count of samples received so far, so that we can include timing
 665     // information in the trace buffer.
 666     int samples = 0;
 667     rsamples = 0;
 668
 669     // Set up the demodulator for tag -> reader responses.
 670         Demod.output = tagToReaderResponse;
 671     Demod.len = 0;
 672     Demod.state = DEMOD_UNSYNCD;
 673
 674     // Setup for the DMA.
 675     FpgaSetupSsc();
 676     upTo = dmaBuf;
 677     lastRxCounter = DMA_BUFFER_SIZE;
 678     FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
 679
 680     // And the reader -> tag commands
 681     memset(&Uart, 0, sizeof(Uart));
 682         Uart.output = readerToTagCmd;
 683     Uart.byteCntMax = 32; // was 100 (greg)////////////////////////////////////////////////////////////////////////
 684     Uart.state = STATE_UNSYNCD;
 685
 686     // And put the FPGA in the appropriate mode
 687     // Signal field is off with the appropriate LED
 688     LED_D_OFF();
 689     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
 690     SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 691
 692         uint32_t time_0 = GetCountSspClk();
 693         uint32_t time_start = 0;
 694         uint32_t time_stop  = 0;
 695
 696     int div = 0;
 697     //int div2 = 0;
 698     int decbyte = 0;
 699     int decbyter = 0;
 700
 701     // And now we loop, receiving samples.
 702     for(;;) {
 703         LED_A_ON();
 704         WDT_HIT();
 705         int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
 706                                 (DMA_BUFFER_SIZE-1);
 707         if(behindBy > maxBehindBy) {
 708             maxBehindBy = behindBy;
 709             if(behindBy > (9 * DMA_BUFFER_SIZE / 10)) {
 710                 Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
 711                 goto done;
 712             }
 713         }
 714         if(behindBy < 1) continue;
 715
 716         LED_A_OFF();
 717         smpl = upTo[0];
 718         upTo++;
 719         lastRxCounter -= 1;
 720         if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
 721             upTo -= DMA_BUFFER_SIZE;
 722             lastRxCounter += DMA_BUFFER_SIZE;
 723             AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
 724             AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
 725         }
 726
 727         //samples += 4;
 728         samples += 1;
 729
 730         if(smpl & 0xF) {
 731                 decbyte ^= (1 << (3 - div));
 732         }
 733
 734         // FOR READER SIDE COMMUMICATION...
 735
 736         decbyter <<= 2;
 737         decbyter ^= (smpl & 0x30);
 738
 739         div++;
 740
 741         if((div + 1) % 2 == 0) {
 742                 smpl = decbyter;
 743                 if(OutOfNDecoding((smpl & 0xF0) >> 4)) {
 744                     rsamples = samples - Uart.samples;
 745                         time_stop = (GetCountSspClk()-time_0) << 4;
 746                     LED_C_ON();
 747
 748                         //if(!LogTrace(Uart.output,Uart.byteCnt, rsamples, Uart.parityBits,TRUE)) break;
 749                         //if(!LogTrace(NULL, 0, Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, 0, TRUE)) break;
 750                         if(tracing)     {
 751                                 uint8_t parity[MAX_PARITY_SIZE];
 752                                 GetParity(Uart.output, Uart.byteCnt, parity);
 753                                 LogTrace(Uart.output,Uart.byteCnt, time_start, time_stop, parity, TRUE);
 754                         }
 755
 756
 757                         /* And ready to receive another command. */
 758                     Uart.state = STATE_UNSYNCD;
 759                     /* And also reset the demod code, which might have been */
 760                     /* false-triggered by the commands from the reader. */
 761                     Demod.state = DEMOD_UNSYNCD;
 762                     LED_B_OFF();
 763                     Uart.byteCnt = 0;
 764                 }else{
 765                         time_start = (GetCountSspClk()-time_0) << 4;
 766                 }
 767                 decbyter = 0;
 768         }
 769
 770         if(div > 3) {
 771                 smpl = decbyte;
 772                 if(ManchesterDecoding(smpl & 0x0F)) {
 773                         time_stop = (GetCountSspClk()-time_0) << 4;
 774
 775                         rsamples = samples - Demod.samples;
 776                     LED_B_ON();
 777
 778                         if(tracing)     {
 779                                 uint8_t parity[MAX_PARITY_SIZE];
 780                                 GetParity(Demod.output, Demod.len, parity);
 781                                 LogTrace(Demod.output, Demod.len, time_start, time_stop, parity, FALSE);
 782                         }
 783
 784                     // And ready to receive another response.
 785                     memset(&Demod, 0, sizeof(Demod));
 786                         Demod.output = tagToReaderResponse;
 787                     Demod.state = DEMOD_UNSYNCD;
 788                     LED_C_OFF();
 789                 }else{
 790                         time_start = (GetCountSspClk()-time_0) << 4;
 791                 }
 792
 793                 div = 0;
 794                 decbyte = 0x00;
 795         }
 796         //}
 797
 798         if(BUTTON_PRESS()) {
 799             DbpString("cancelled_a");
 800             goto done;
 801         }
 802     }
 803
 804     DbpString("COMMAND FINISHED");
 805
 806     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
 807         Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);
 808
 809 done:
 810     AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
 811     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
 812         Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);
 813     LED_A_OFF();
 814     LED_B_OFF();
 815     LED_C_OFF();
 816     LED_D_OFF();
 817 }
 818
 819 void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {
 820         int i;
 821         for(i = 0; i < 8; i++) {
 822                 rotatedCSN[i] = (originalCSN[i] >> 3) | (originalCSN[(i+1)%8] << 5);
 823         }
 824 }
 825
 826 //-----------------------------------------------------------------------------
 827 // Wait for commands from reader
 828 // Stop when button is pressed
 829 // Or return TRUE when command is captured
 830 //-----------------------------------------------------------------------------
 831 static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
 832 {
 833     // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen
 834     // only, since we are receiving, not transmitting).
 835     // Signal field is off with the appropriate LED
 836     LED_D_OFF();
 837     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
 838
 839     // Now run a `software UART' on the stream of incoming samples.
 840     Uart.output = received;
 841     Uart.byteCntMax = maxLen;
 842     Uart.state = STATE_UNSYNCD;
 843
 844     for(;;) {
 845         WDT_HIT();
 846
 847         if(BUTTON_PRESS()) return FALSE;
 848
 849         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
 850             AT91C_BASE_SSC->SSC_THR = 0x00;
 851         }
 852         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
 853             uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
 854
 855                         if(OutOfNDecoding(b & 0x0f)) {
 856                                 *len = Uart.byteCnt;
 857                                 return TRUE;
 858                         }
 859         }
 860     }
 861 }
 862
 863 static uint8_t encode4Bits(const uint8_t b)
 864 {
 865         uint8_t c = b & 0xF;
 866         // OTA, the least significant bits first
 867         //         The columns are
 868         //               1 - Bit value to send
 869         //               2 - Reversed (big-endian)
 870         //               3 - Encoded
 871         //               4 - Hex values
 872
 873         switch(c){
 874         //                          1       2         3         4
 875           case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55
 876           case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95
 877           case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65
 878           case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5
 879           case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59
 880           case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99
 881           case 9:  return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69
 882           case 8:  return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9
 883           case 7:  return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56
 884           case 6:  return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96
 885           case 5:  return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66
 886           case 4:  return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6
 887           case 3:  return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a
 888           case 2:  return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a
 889           case 1:  return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a
 890           default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa
 891
 892         }
 893 }
 894
 895 //-----------------------------------------------------------------------------
 896 // Prepare tag messages
 897 //-----------------------------------------------------------------------------
 898 static void CodeIClassTagAnswer(const uint8_t *cmd, int len)
 899 {
 900
 901         /*
 902          * SOF comprises 3 parts;
 903          * * An unmodulated time of 56.64 us
 904          * * 24 pulses of 423.75 KHz (fc/32)
 905          * * A logic 1, which starts with an unmodulated time of 18.88us
 906          *   followed by 8 pulses of 423.75kHz (fc/32)
 907          *
 908          *
 909          * EOF comprises 3 parts:
 910          * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated
 911          *   time of 18.88us.
 912          * - 24 pulses of fc/32
 913          * - An unmodulated time of 56.64 us
 914          *
 915          *
 916          * A logic 0 starts with 8 pulses of fc/32
 917          * followed by an unmodulated time of 256/fc (~18,88us).
 918          *
 919          * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by
 920          * 8 pulses of fc/32 (also 18.88us)
 921          *
 922          * The mode FPGA_HF_SIMULATOR_MODULATE_424K_8BIT which we use to simulate tag,
 923          * works like this.
 924          * - A 1-bit input to the FPGA becomes 8 pulses on 423.5kHz (fc/32) (18.88us).
 925          * - A 0-bit inptu to the FPGA becomes an unmodulated time of 18.88us
 926          *
 927          * In this mode the SOF can be written as 00011101 = 0x1D
 928          * The EOF can be written as 10111000 = 0xb8
 929          * A logic 1 is 01
 930          * A logic 0 is 10
 931          *
 932          * */
 933
 934         int i;
 935
 936         ToSendReset();
 937
 938         // Send SOF
 939         ToSend[++ToSendMax] = 0x1D;
 940
 941         for(i = 0; i < len; i++) {
 942                 uint8_t b = cmd[i];
 943                 ToSend[++ToSendMax] = encode4Bits(b & 0xF); //Least significant half
 944                 ToSend[++ToSendMax] = encode4Bits((b >>4) & 0xF);//Most significant half
 945         }
 946
 947         // Send EOF
 948         ToSend[++ToSendMax] = 0xB8;
 949         //lastProxToAirDuration  = 8*ToSendMax - 3*8 - 3*8;//Not counting zeroes in the beginning or end
 950         // Convert from last byte pos to length
 951         ToSendMax++;
 952 }
 953
 954 // Only SOF
 955 static void CodeIClassTagSOF()
 956 {
 957         //So far a dummy implementation, not used
 958         //int lastProxToAirDuration =0;
 959
 960         ToSendReset();
 961         // Send SOF
 962         ToSend[++ToSendMax] = 0x1D;
 963 //      lastProxToAirDuration  = 8*ToSendMax - 3*8;//Not counting zeroes in the beginning
 964
 965         // Convert from last byte pos to length
 966         ToSendMax++;
 967 }
 968
 969 int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf);
 970 /**
 971  * @brief SimulateIClass simulates an iClass card.
 972  * @param arg0 type of simulation
 973  *                      - 0 uses the first 8 bytes in usb data as CSN
 974  *                      - 2 "dismantling iclass"-attack. This mode iterates through all CSN's specified
 975  *                      in the usb data. This mode collects MAC from the reader, in order to do an offline
 976  *                      attack on the keys. For more info, see "dismantling iclass" and proxclone.com.
 977  *                      - Other : Uses the default CSN (031fec8af7ff12e0)
 978  * @param arg1 - number of CSN's contained in datain (applicable for mode 2 only)
 979  * @param arg2
 980  * @param datain
 981  */
 982 void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain)
 983 {
 984         uint32_t simType = arg0;
 985         uint32_t numberOfCSNS = arg1;
 986         FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 987
 988         // Enable and clear the trace
 989         set_tracing(TRUE);
 990         clear_trace();
 991
 992         uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
 993         if(simType == 0) {
 994                 // Use the CSN from commandline
 995                 memcpy(csn_crc, datain, 8);
 996                 doIClassSimulation(csn_crc,0,NULL);
 997         }else if(simType == 1)
 998         {
 999                 doIClassSimulation(csn_crc,0,NULL);
1000         }
1001         else if(simType == 2)
1002         {
1003
1004                 uint8_t mac_responses[USB_CMD_DATA_SIZE] = { 0 };
1005                 Dbprintf("Going into attack mode, %d CSNS sent", numberOfCSNS);
1006                 // In this mode, a number of csns are within datain. We'll simulate each one, one at a time
1007                 // in order to collect MAC's from the reader. This can later be used in an offlne-attack
1008                 // in order to obtain the keys, as in the "dismantling iclass"-paper.
1009                 int i = 0;
1010                 for( ; i < numberOfCSNS && i*8+8 < USB_CMD_DATA_SIZE; i++)
1011                 {
1012                         // The usb data is 512 bytes, fitting 65 8-byte CSNs in there.
1013
1014                         memcpy(csn_crc, datain+(i*8), 8);
1015                         if(doIClassSimulation(csn_crc,1,mac_responses+i*8))
1016                         {
1017                                 cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);
1018                                 return; // Button pressed
1019                         }
1020                 }
1021                 cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);
1022
1023         }
1024         else{
1025                 // We may want a mode here where we hardcode the csns to use (from proxclone).
1026                 // That will speed things up a little, but not required just yet.
1027                 Dbprintf("The mode is not implemented, reserved for future use");
1028         }
1029         Dbprintf("Done...");
1030
1031 }
1032 /**
1033  * @brief Does the actual simulation
1034  * @param csn - csn to use
1035  * @param breakAfterMacReceived if true, returns after reader MAC has been received.
1036  */
1037 int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf)
1038 {
1039
1040         // CSN followed by two CRC bytes
1041         uint8_t response1[] = { 0x0F} ;
1042         uint8_t response2[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1043         uint8_t response3[] = { 0,0,0,0,0,0,0,0,0,0};
1044         memcpy(response3,csn,sizeof(response3));
1045         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]);
1046         // e-Purse
1047         uint8_t response4[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1048
1049         // Construct anticollision-CSN
1050         rotateCSN(response3,response2);
1051
1052         // Compute CRC on both CSNs
1053         ComputeCrc14443(CRC_ICLASS, response2, 8, &response2[8], &response2[9]);
1054         ComputeCrc14443(CRC_ICLASS, response3, 8, &response3[8], &response3[9]);
1055
1056         int exitLoop = 0;
1057         // Reader 0a
1058         // Tag    0f
1059         // Reader 0c
1060         // Tag    anticoll. CSN
1061         // Reader 81 anticoll. CSN
1062         // Tag    CSN
1063
1064         uint8_t *modulated_response;
1065         int modulated_response_size;
1066         uint8_t* trace_data = NULL;
1067         int trace_data_size = 0;
1068         //uint8_t sof = 0x0f;
1069
1070         // free eventually allocated BigBuf memory
1071         BigBuf_free();
1072         // Respond SOF -- takes 1 bytes
1073         uint8_t *resp1 = BigBuf_malloc(2);
1074         int resp1Len;
1075
1076         // Anticollision CSN (rotated CSN)
1077         // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
1078         uint8_t *resp2 = BigBuf_malloc(28);
1079         int resp2Len;
1080
1081         // CSN
1082         // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
1083         uint8_t *resp3 = BigBuf_malloc(30);
1084         int resp3Len;
1085
1086         // e-Purse
1087         // 18: Takes 2 bytes for SOF/EOF and 8 * 2 = 16 bytes (2 bytes/bit)
1088         uint8_t *resp4 = BigBuf_malloc(20);
1089         int resp4Len;
1090
1091         uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
1092         memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
1093         int len;
1094
1095         // Prepare card messages
1096         ToSendMax = 0;
1097
1098         // First card answer: SOF
1099         CodeIClassTagSOF();
1100         memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
1101
1102         // Anticollision CSN
1103         CodeIClassTagAnswer(response2, sizeof(response2));
1104         memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax;
1105
1106         // CSN
1107         CodeIClassTagAnswer(response3, sizeof(response3));
1108         memcpy(resp3, ToSend, ToSendMax); resp3Len = ToSendMax;
1109
1110         // e-Purse
1111         CodeIClassTagAnswer(response4, sizeof(response4));
1112         memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax;
1113
1114
1115         // Start from off (no field generated)
1116         //FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1117         //SpinDelay(200);
1118         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
1119         SpinDelay(100);
1120         StartCountSspClk();
1121         // We need to listen to the high-frequency, peak-detected path.
1122         SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1123         FpgaSetupSsc();
1124
1125         // To control where we are in the protocol
1126         int cmdsRecvd = 0;
1127         uint32_t time_0 = GetCountSspClk();
1128         uint32_t t2r_time =0;
1129         uint32_t r2t_time =0;
1130
1131         LED_A_ON();
1132         bool buttonPressed = false;
1133
1134         while(!exitLoop) {
1135
1136                 LED_B_OFF();
1137                 //Signal tracer
1138                 // Can be used to get a trigger for an oscilloscope..
1139                 LED_C_OFF();
1140
1141                 if(!GetIClassCommandFromReader(receivedCmd, &len, 100)) {
1142                         buttonPressed = true;
1143                         break;
1144                 }
1145                 r2t_time = GetCountSspClk();
1146                 //Signal tracer
1147                 LED_C_ON();
1148
1149                 // Okay, look at the command now.
1150                 if(receivedCmd[0] == 0x0a ) {
1151                         // Reader in anticollission phase
1152                         modulated_response = resp1; modulated_response_size = resp1Len; //order = 1;
1153                         trace_data = response1;
1154                         trace_data_size = sizeof(response1);
1155                 } else if(receivedCmd[0] == 0x0c) {
1156                         // Reader asks for anticollission CSN
1157                         modulated_response = resp2; modulated_response_size = resp2Len; //order = 2;
1158                         trace_data = response2;
1159                         trace_data_size = sizeof(response2);
1160                         //DbpString("Reader requests anticollission CSN:");
1161                 } else if(receivedCmd[0] == 0x81) {
1162                         // Reader selects anticollission CSN.
1163                         // Tag sends the corresponding real CSN
1164                         modulated_response = resp3; modulated_response_size = resp3Len; //order = 3;
1165                         trace_data = response3;
1166                         trace_data_size = sizeof(response3);
1167                         //DbpString("Reader selects anticollission CSN:");
1168                 } else if(receivedCmd[0] == 0x88) {
1169                         // Read e-purse (88 02)
1170                         modulated_response = resp4; modulated_response_size = resp4Len; //order = 4;
1171                         trace_data = response4;
1172                         trace_data_size = sizeof(response4);
1173                         LED_B_ON();
1174                 } else if(receivedCmd[0] == 0x05) {
1175                         // Reader random and reader MAC!!!
1176                         // Do not respond
1177             // We do not know what to answer, so lets keep quiet
1178                         modulated_response = resp1; modulated_response_size = 0; //order = 5;
1179                         trace_data = NULL;
1180                         trace_data_size = 0;
1181                         if (breakAfterMacReceived){
1182                                 // dbprintf:ing ...
1183                                 Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x"
1184                                                    ,csn[0],csn[1],csn[2],csn[3],csn[4],csn[5],csn[6],csn[7]);
1185                                 Dbprintf("RDR:  (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",len,
1186                                                 receivedCmd[0], receivedCmd[1], receivedCmd[2],
1187                                                 receivedCmd[3], receivedCmd[4], receivedCmd[5],
1188                                                 receivedCmd[6], receivedCmd[7], receivedCmd[8]);
1189                                 if (reader_mac_buf != NULL)
1190                                 {
1191                                         memcpy(reader_mac_buf,receivedCmd+1,8);
1192                                 }
1193                                 exitLoop = true;
1194                         }
1195                 } else if(receivedCmd[0] == 0x00 && len == 1) {
1196                         // Reader ends the session
1197                         modulated_response = resp1; modulated_response_size = 0; //order = 0;
1198                         trace_data = NULL;
1199                         trace_data_size = 0;
1200                 } else {
1201                         //#db# Unknown command received from reader (len=5): 26 1 0 f6 a 44 44 44 44
1202                         // Never seen this command before
1203                         Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x",
1204                         len,
1205                         receivedCmd[0], receivedCmd[1], receivedCmd[2],
1206                         receivedCmd[3], receivedCmd[4], receivedCmd[5],
1207                         receivedCmd[6], receivedCmd[7], receivedCmd[8]);
1208                         // Do not respond
1209                         modulated_response = resp1; modulated_response_size = 0; //order = 0;
1210                         trace_data = NULL;
1211                         trace_data_size = 0;
1212                 }
1213
1214                 if(cmdsRecvd >  100) {
1215                         //DbpString("100 commands later...");
1216                         //break;
1217                 }
1218                 else {
1219                         cmdsRecvd++;
1220                 }
1221                 /**
1222                 A legit tag has about 380us delay between reader EOT and tag SOF.
1223                 **/
1224                 if(modulated_response_size > 0) {
1225                         SendIClassAnswer(modulated_response, modulated_response_size, 1);
1226                         t2r_time = GetCountSspClk();
1227                 }
1228
1229                 if (tracing) {
1230                         uint8_t parity[MAX_PARITY_SIZE];
1231                         GetParity(receivedCmd, len, parity);
1232                         LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, (r2t_time-time_0) << 4, parity, TRUE);
1233
1234                         if (trace_data != NULL) {
1235                                 GetParity(trace_data, trace_data_size, parity);
1236                                 LogTrace(trace_data, trace_data_size, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, FALSE);
1237                         }
1238                         if(!tracing) {
1239                                 DbpString("Trace full");
1240                                 //break;
1241                         }
1242
1243                 }
1244                 memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
1245         }
1246
1247         //Dbprintf("%x", cmdsRecvd);
1248         LED_A_OFF();
1249         LED_B_OFF();
1250         LED_C_OFF();
1251
1252         if(buttonPressed)
1253         {
1254                 DbpString("Button pressed");
1255         }
1256         return buttonPressed;
1257 }
1258
1259 static int SendIClassAnswer(uint8_t *resp, int respLen, int delay)
1260 {
1261         int i = 0, d=0;//, u = 0, d = 0;
1262         uint8_t b = 0;
1263
1264         //FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
1265         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K_8BIT);
1266
1267         AT91C_BASE_SSC->SSC_THR = 0x00;
1268         FpgaSetupSsc();
1269         while(!BUTTON_PRESS()) {
1270                 if((AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)){
1271                         b = AT91C_BASE_SSC->SSC_RHR; (void) b;
1272                 }
1273                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)){
1274                         b = 0x00;
1275                         if(d < delay) {
1276                                 d++;
1277                         }
1278                         else {
1279                                 if( i < respLen){
1280                                         b = resp[i];
1281                                         //Hack
1282                                         //b = 0xAC;
1283                                 }
1284                                 i++;
1285                         }
1286                         AT91C_BASE_SSC->SSC_THR = b;
1287                 }
1288
1289 //              if (i > respLen +4) break;
1290                 if (i > respLen +1) break;
1291         }
1292
1293         return 0;
1294 }
1295
1296 /// THE READER CODE
1297
1298 //-----------------------------------------------------------------------------
1299 // Transmit the command (to the tag) that was placed in ToSend[].
1300 //-----------------------------------------------------------------------------
1301 static void TransmitIClassCommand(const uint8_t *cmd, int len, int *samples, int *wait)
1302 {
1303   int c;
1304   FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1305   AT91C_BASE_SSC->SSC_THR = 0x00;
1306   FpgaSetupSsc();
1307
1308    if (wait)
1309    {
1310      if(*wait < 10) *wait = 10;
1311
1312      for(c = 0; c < *wait;) {
1313        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1314          AT91C_BASE_SSC->SSC_THR = 0x00;                // For exact timing!
1315          c++;
1316        }
1317        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1318          volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
1319          (void)r;
1320        }
1321        WDT_HIT();
1322      }
1323
1324    }
1325
1326
1327   uint8_t sendbyte;
1328   bool firstpart = TRUE;
1329   c = 0;
1330   for(;;) {
1331     if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1332
1333       // DOUBLE THE SAMPLES!
1334       if(firstpart) {
1335         sendbyte = (cmd[c] & 0xf0) | (cmd[c] >> 4);
1336       }
1337       else {
1338         sendbyte = (cmd[c] & 0x0f) | (cmd[c] << 4);
1339         c++;
1340       }
1341       if(sendbyte == 0xff) {
1342         sendbyte = 0xfe;
1343       }
1344       AT91C_BASE_SSC->SSC_THR = sendbyte;
1345       firstpart = !firstpart;
1346
1347       if(c >= len) {
1348         break;
1349       }
1350     }
1351     if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1352       volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
1353       (void)r;
1354     }
1355     WDT_HIT();
1356   }
1357   if (samples) *samples = (c + *wait) << 3;
1358 }
1359
1360
1361 //-----------------------------------------------------------------------------
1362 // Prepare iClass reader command to send to FPGA
1363 //-----------------------------------------------------------------------------
1364 void CodeIClassCommand(const uint8_t * cmd, int len)
1365 {
1366   int i, j, k;
1367   uint8_t b;
1368
1369   ToSendReset();
1370
1371   // Start of Communication: 1 out of 4
1372   ToSend[++ToSendMax] = 0xf0;
1373   ToSend[++ToSendMax] = 0x00;
1374   ToSend[++ToSendMax] = 0x0f;
1375   ToSend[++ToSendMax] = 0x00;
1376
1377   // Modulate the bytes
1378   for (i = 0; i < len; i++) {
1379     b = cmd[i];
1380     for(j = 0; j < 4; j++) {
1381       for(k = 0; k < 4; k++) {
1382                         if(k == (b & 3)) {
1383                                 ToSend[++ToSendMax] = 0x0f;
1384                         }
1385                         else {
1386                                 ToSend[++ToSendMax] = 0x00;
1387                         }
1388       }
1389       b >>= 2;
1390     }
1391   }
1392
1393   // End of Communication
1394   ToSend[++ToSendMax] = 0x00;
1395   ToSend[++ToSendMax] = 0x00;
1396   ToSend[++ToSendMax] = 0xf0;
1397   ToSend[++ToSendMax] = 0x00;
1398
1399   // Convert from last character reference to length
1400   ToSendMax++;
1401 }
1402
1403 void ReaderTransmitIClass(uint8_t* frame, int len)
1404 {
1405         int wait = 0;
1406         int samples = 0;
1407
1408         // This is tied to other size changes
1409         CodeIClassCommand(frame,len);
1410
1411         // Select the card
1412         TransmitIClassCommand(ToSend, ToSendMax, &samples, &wait);
1413         if(trigger)
1414                 LED_A_ON();
1415
1416         // Store reader command in buffer
1417         if (tracing) {
1418                 uint8_t par[MAX_PARITY_SIZE];
1419                 GetParity(frame, len, par);
1420                 LogTrace(frame, len, rsamples, rsamples, par, TRUE);
1421         }
1422 }
1423
1424 //-----------------------------------------------------------------------------
1425 // Wait a certain time for tag response
1426 //  If a response is captured return TRUE
1427 //  If it takes too long return FALSE
1428 //-----------------------------------------------------------------------------
1429 static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) //uint8_t *buffer
1430 {
1431         // buffer needs to be 512 bytes
1432         int c;
1433
1434         // Set FPGA mode to "reader listen mode", no modulation (listen
1435         // only, since we are receiving, not transmitting).
1436         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN);
1437
1438         // Now get the answer from the card
1439         Demod.output = receivedResponse;
1440         Demod.len = 0;
1441         Demod.state = DEMOD_UNSYNCD;
1442
1443         uint8_t b;
1444         if (elapsed) *elapsed = 0;
1445
1446         bool skip = FALSE;
1447
1448         c = 0;
1449         for(;;) {
1450                 WDT_HIT();
1451
1452                 if(BUTTON_PRESS()) return FALSE;
1453
1454                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1455                         AT91C_BASE_SSC->SSC_THR = 0x00;  // To make use of exact timing of next command from reader!!
1456                         if (elapsed) (*elapsed)++;
1457                 }
1458                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1459                         if(c < timeout) { c++; } else { return FALSE; }
1460                         b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
1461                         skip = !skip;
1462                         if(skip) continue;
1463
1464                         if(ManchesterDecoding(b & 0x0f)) {
1465                                 *samples = c << 3;
1466                                 return  TRUE;
1467                         }
1468                 }
1469         }
1470 }
1471
1472 int ReaderReceiveIClass(uint8_t* receivedAnswer)
1473 {
1474   int samples = 0;
1475   if (!GetIClassAnswer(receivedAnswer,160,&samples,0)) return FALSE;
1476   rsamples += samples;
1477   if (tracing) {
1478         uint8_t parity[MAX_PARITY_SIZE];
1479         GetParity(receivedAnswer, Demod.len, parity);
1480         LogTrace(receivedAnswer,Demod.len,rsamples,rsamples,parity,FALSE);
1481   }
1482   if(samples == 0) return FALSE;
1483   return Demod.len;
1484 }
1485
1486 void setupIclassReader()
1487 {
1488     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
1489     // Reset trace buffer
1490         set_tracing(TRUE);
1491         clear_trace();
1492
1493     // Setup SSC
1494     FpgaSetupSsc();
1495     // Start from off (no field generated)
1496     // Signal field is off with the appropriate LED
1497     LED_D_OFF();
1498     FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1499     SpinDelay(200);
1500
1501     SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1502
1503     // Now give it time to spin up.
1504     // Signal field is on with the appropriate LED
1505     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1506     SpinDelay(200);
1507     LED_A_ON();
1508
1509 }
1510
1511 size_t sendCmdGetResponseWithRetries(uint8_t* command, size_t cmdsize, uint8_t* resp, uint8_t expected_size, uint8_t retries)
1512 {
1513         while(retries-- > 0)
1514         {
1515                 ReaderTransmitIClass(command, cmdsize);
1516                 if(expected_size == ReaderReceiveIClass(resp)){
1517                         return 0;
1518                 }
1519         }
1520         return 1;//Error
1521 }
1522
1523 /**
1524  * @brief Talks to an iclass tag, sends the commands to get CSN and CC.
1525  * @param card_data where the CSN and CC are stored for return
1526  * @return 0 = fail
1527  *         1 = Got CSN
1528  *         2 = Got CSN and CC
1529  */
1530 uint8_t handshakeIclassTag(uint8_t *card_data)
1531 {
1532         static uint8_t act_all[]     = { 0x0a };
1533         static uint8_t identify[]    = { 0x0c };
1534         static uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1535         static uint8_t readcheck_cc[]= { 0x88, 0x02 };
1536         uint8_t resp[ICLASS_BUFFER_SIZE];
1537
1538         uint8_t read_status = 0;
1539
1540         // Send act_all
1541         ReaderTransmitIClass(act_all, 1);
1542         // Card present?
1543         if(!ReaderReceiveIClass(resp)) return read_status;//Fail
1544         //Send Identify
1545         ReaderTransmitIClass(identify, 1);
1546         //We expect a 10-byte response here, 8 byte anticollision-CSN and 2 byte CRC
1547         uint8_t len  = ReaderReceiveIClass(resp);
1548         if(len != 10) return read_status;//Fail
1549
1550         //Copy the Anti-collision CSN to our select-packet
1551         memcpy(&select[1],resp,8);
1552         //Select the card
1553         ReaderTransmitIClass(select, sizeof(select));
1554         //We expect a 10-byte response here, 8 byte CSN and 2 byte CRC
1555         len  = ReaderReceiveIClass(resp);
1556         if(len != 10) return read_status;//Fail
1557
1558         //Success - level 1, we got CSN
1559         //Save CSN in response data
1560         memcpy(card_data,resp,8);
1561
1562         //Flag that we got to at least stage 1, read CSN
1563         read_status = 1;
1564
1565         // Card selected, now read e-purse (cc)
1566         ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
1567         if(ReaderReceiveIClass(resp) == 8) {
1568                 //Save CC (e-purse) in response data
1569                 memcpy(card_data+8,resp,8);
1570
1571                 //Got both
1572                 read_status = 2;
1573         }
1574
1575         return read_status;
1576 }
1577
1578 // Reader iClass Anticollission
1579 void ReaderIClass(uint8_t arg0) {
1580
1581     uint8_t card_data[24]={0};
1582     uint8_t last_csn[8]={0};
1583
1584     int read_status= 0;
1585     bool abort_after_read = arg0 & FLAG_ICLASS_READER_ONLY_ONCE;
1586         bool get_cc = arg0 & FLAG_ICLASS_READER_GET_CC;
1587         set_tracing(TRUE);
1588     setupIclassReader();
1589
1590     size_t datasize = 0;
1591     while(!BUTTON_PRESS())
1592     {
1593
1594                 if(!tracing) {
1595                         DbpString("Trace full");
1596                         break;
1597                 }
1598                 WDT_HIT();
1599
1600                 read_status = handshakeIclassTag(card_data);
1601
1602                 if(read_status == 0) continue;
1603                 if(read_status == 1) datasize = 8;
1604                 if(read_status == 2) datasize = 16;
1605
1606                 LED_B_ON();
1607                 //Send back to client, but don't bother if we already sent this
1608                 if(memcmp(last_csn, card_data, 8) != 0)
1609                 {
1610
1611                         if(!get_cc || (get_cc && read_status == 2))
1612                         {
1613                                 cmd_send(CMD_ACK,read_status,0,0,card_data,datasize);
1614                                 if(abort_after_read) {
1615                                         LED_A_OFF();
1616                                         return;
1617                                 }
1618                                 //Save that we already sent this....
1619                                 memcpy(last_csn, card_data, 8);
1620                         }
1621                         //If 'get_cc' was specified and we didn't get a CC, we'll just keep trying...
1622                 }
1623                 LED_B_OFF();
1624     }
1625     cmd_send(CMD_ACK,0,0,0,card_data, 0);
1626     LED_A_OFF();
1627 }
1628
1629 void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
1630
1631         uint8_t card_data[USB_CMD_DATA_SIZE]={0};
1632         uint16_t block_crc_LUT[255] = {0};
1633
1634         {//Generate a lookup table for block crc
1635                 for(int block = 0; block < 255; block++){
1636                         char bl = block;
1637                         block_crc_LUT[block] = iclass_crc16(&bl ,1);
1638                 }
1639         }
1640         //Dbprintf("Lookup table: %02x %02x %02x" ,block_crc_LUT[0],block_crc_LUT[1],block_crc_LUT[2]);
1641
1642         uint8_t check[]       = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1643         uint8_t read[]        = { 0x0c, 0x00, 0x00, 0x00 };
1644
1645     uint16_t crc = 0;
1646         uint8_t cardsize=0;
1647         uint8_t mem=0;
1648
1649         static struct memory_t{
1650           int k16;
1651           int book;
1652           int k2;
1653           int lockauth;
1654           int keyaccess;
1655         } memory;
1656
1657         uint8_t resp[ICLASS_BUFFER_SIZE];
1658
1659     setupIclassReader();
1660         set_tracing(TRUE);
1661
1662         while(!BUTTON_PRESS()) {
1663
1664                 WDT_HIT();
1665
1666                 if(!tracing) {
1667                         DbpString("Trace full");
1668                         break;
1669                 }
1670
1671                 uint8_t read_status = handshakeIclassTag(card_data);
1672                 if(read_status < 2) continue;
1673
1674                 //for now replay captured auth (as cc not updated)
1675                 memcpy(check+5,MAC,4);
1676
1677                 if(sendCmdGetResponseWithRetries(check, sizeof(check),resp, 4, 5))
1678                 {
1679                         Dbprintf("Error: Authentication Fail!");
1680                         continue;
1681                 }
1682
1683                 //first get configuration block (block 1)
1684                 crc = block_crc_LUT[1];
1685                 read[1]=1;
1686                 read[2] = crc >> 8;
1687                 read[3] = crc & 0xff;
1688
1689                 if(sendCmdGetResponseWithRetries(read, sizeof(read),resp, 10, 10))
1690                 {
1691                         Dbprintf("Dump config (block 1) failed");
1692                         continue;
1693                 }
1694
1695                 mem=resp[5];
1696                 memory.k16= (mem & 0x80);
1697                 memory.book= (mem & 0x20);
1698                 memory.k2= (mem & 0x8);
1699                 memory.lockauth= (mem & 0x2);
1700                 memory.keyaccess= (mem & 0x1);
1701
1702                 cardsize = memory.k16 ? 255 : 32;
1703                 WDT_HIT();
1704                 //Set card_data to all zeroes, we'll fill it with data
1705                 memset(card_data,0x0,USB_CMD_DATA_SIZE);
1706                 uint8_t failedRead =0;
1707                 uint32_t stored_data_length =0;
1708                 //then loop around remaining blocks
1709                 for(int block=0; block < cardsize; block++){
1710
1711                         read[1]= block;
1712                         crc = block_crc_LUT[block];
1713                         read[2] = crc >> 8;
1714                         read[3] = crc & 0xff;
1715
1716                         if(!sendCmdGetResponseWithRetries(read, sizeof(read), resp, 10, 10))
1717                         {
1718                                 Dbprintf("     %02x: %02x %02x %02x %02x %02x %02x %02x %02x",
1719                                                  block, resp[0], resp[1], resp[2],
1720                                                 resp[3], resp[4], resp[5],
1721                                                 resp[6], resp[7]);
1722
1723                                 //Fill up the buffer
1724                                 memcpy(card_data+stored_data_length,resp,8);
1725                                 stored_data_length += 8;
1726                                 if(stored_data_length +8 > USB_CMD_DATA_SIZE)
1727                                 {//Time to send this off and start afresh
1728                                         cmd_send(CMD_ACK,
1729                                                          stored_data_length,//data length
1730                                                          failedRead,//Failed blocks?
1731                                                          0,//Not used ATM
1732                                                          card_data, stored_data_length);
1733                                         //reset
1734                                         stored_data_length = 0;
1735                                         failedRead = 0;
1736                                 }
1737
1738                         }else{
1739                                 failedRead = 1;
1740                                 stored_data_length +=8;//Otherwise, data becomes misaligned
1741                                 Dbprintf("Failed to dump block %d", block);
1742                         }
1743                 }
1744
1745                 //Send off any remaining data
1746                 if(stored_data_length > 0)
1747                 {
1748                         cmd_send(CMD_ACK,
1749                                          stored_data_length,//data length
1750                                          failedRead,//Failed blocks?
1751                                          0,//Not used ATM
1752                                          card_data, stored_data_length);
1753                 }
1754                 //If we got here, let's break
1755                 break;
1756         }
1757         //Signal end of transmission
1758         cmd_send(CMD_ACK,
1759                          0,//data length
1760                          0,//Failed blocks?
1761                          0,//Not used ATM
1762                          card_data, 0);
1763
1764         LED_A_OFF();
1765 }
1766
1767 //2. Create Read method (cut-down from above) based off responses from 1.
1768 //   Since we have the MAC could continue to use replay function.
1769 //3. Create Write method
1770 /*
1771 void IClass_iso14443A_write(uint8_t arg0, uint8_t blockNo, uint8_t *data, uint8_t *MAC) {
1772         uint8_t act_all[]     = { 0x0a };
1773         uint8_t identify[]    = { 0x0c };
1774         uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1775         uint8_t readcheck_cc[]= { 0x88, 0x02 };
1776         uint8_t check[]       = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1777         uint8_t read[]        = { 0x0c, 0x00, 0x00, 0x00 };
1778         uint8_t write[]       = { 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1779
1780     uint16_t crc = 0;
1781
1782         uint8_t* resp = (((uint8_t *)BigBuf) + 3560);
1783
1784         // Reset trace buffer
1785     memset(trace, 0x44, RECV_CMD_OFFSET);
1786         traceLen = 0;
1787
1788         // Setup SSC
1789         FpgaSetupSsc();
1790         // Start from off (no field generated)
1791         // Signal field is off with the appropriate LED
1792         LED_D_OFF();
1793         FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1794         SpinDelay(200);
1795
1796         SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1797
1798         // Now give it time to spin up.
1799         // Signal field is on with the appropriate LED
1800         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1801         SpinDelay(200);
1802
1803         LED_A_ON();
1804
1805         for(int i=0;i<1;i++) {
1806
1807                 if(traceLen > TRACE_SIZE) {
1808                         DbpString("Trace full");
1809                         break;
1810                 }
1811
1812                 if (BUTTON_PRESS()) break;
1813
1814                 // Send act_all
1815                 ReaderTransmitIClass(act_all, 1);
1816                 // Card present?
1817                 if(ReaderReceiveIClass(resp)) {
1818                         ReaderTransmitIClass(identify, 1);
1819                         if(ReaderReceiveIClass(resp) == 10) {
1820                                 // Select card
1821                                 memcpy(&select[1],resp,8);
1822                                 ReaderTransmitIClass(select, sizeof(select));
1823
1824                                 if(ReaderReceiveIClass(resp) == 10) {
1825                                         Dbprintf("     Selected CSN: %02x %02x %02x %02x %02x %02x %02x %02x",
1826                                         resp[0], resp[1], resp[2],
1827                                         resp[3], resp[4], resp[5],
1828                                         resp[6], resp[7]);
1829                                 }
1830                                 // Card selected
1831                                 Dbprintf("Readcheck on Sector 2");
1832                                 ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
1833                                 if(ReaderReceiveIClass(resp) == 8) {
1834                                    Dbprintf("     CC: %02x %02x %02x %02x %02x %02x %02x %02x",
1835                                         resp[0], resp[1], resp[2],
1836                                         resp[3], resp[4], resp[5],
1837                                         resp[6], resp[7]);
1838                                 }else return;
1839                                 Dbprintf("Authenticate");
1840                                 //for now replay captured auth (as cc not updated)
1841                                 memcpy(check+5,MAC,4);
1842                                 Dbprintf("     AA: %02x %02x %02x %02x",
1843                                         check[5], check[6], check[7],check[8]);
1844                                 ReaderTransmitIClass(check, sizeof(check));
1845                                 if(ReaderReceiveIClass(resp) == 4) {
1846                                    Dbprintf("     AR: %02x %02x %02x %02x",
1847                                         resp[0], resp[1], resp[2],resp[3]);
1848                                 }else {
1849                                   Dbprintf("Error: Authentication Fail!");
1850                                   return;
1851                                 }
1852                                 Dbprintf("Write Block");
1853
1854                                 //read configuration for max block number
1855                                 read_success=false;
1856                                 read[1]=1;
1857                                 uint8_t *blockno=&read[1];
1858                                 crc = iclass_crc16((char *)blockno,1);
1859                                 read[2] = crc >> 8;
1860                                 read[3] = crc & 0xff;
1861                                 while(!read_success){
1862                                       ReaderTransmitIClass(read, sizeof(read));
1863                                       if(ReaderReceiveIClass(resp) == 10) {
1864                                          read_success=true;
1865                                          mem=resp[5];
1866                                          memory.k16= (mem & 0x80);
1867                                          memory.book= (mem & 0x20);
1868                                          memory.k2= (mem & 0x8);
1869                                          memory.lockauth= (mem & 0x2);
1870                                          memory.keyaccess= (mem & 0x1);
1871
1872                                       }
1873                                 }
1874                                 if (memory.k16){
1875                                   cardsize=255;
1876                                 }else cardsize=32;
1877                                 //check card_size
1878
1879                                 memcpy(write+1,blockNo,1);
1880                                 memcpy(write+2,data,8);
1881                                 memcpy(write+10,mac,4);
1882                                 while(!send_success){
1883                                   ReaderTransmitIClass(write, sizeof(write));
1884                                   if(ReaderReceiveIClass(resp) == 10) {
1885                                     write_success=true;
1886                                 }
1887                         }//
1888                 }
1889                 WDT_HIT();
1890         }
1891
1892         LED_A_OFF();
1893 }*/