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 #include "protocols.h"
  51 #include "optimized_cipher.h"
  52
  53 static int timeout = 4096;
  54
  55
  56 static int SendIClassAnswer(uint8_t *resp, int respLen, int delay);
  57
  58 //-----------------------------------------------------------------------------
  59 // The software UART that receives commands from the reader, and its state
  60 // variables.
  61 //-----------------------------------------------------------------------------
  62 static struct {
  63     enum {
  64         STATE_UNSYNCD,
  65         STATE_START_OF_COMMUNICATION,
  66         STATE_RECEIVING
  67     }       state;
  68     uint16_t    shiftReg;
  69     int     bitCnt;
  70     int     byteCnt;
  71     int     byteCntMax;
  72     int     posCnt;
  73     int     nOutOfCnt;
  74     int     OutOfCnt;
  75     int     syncBit;
  76     int     samples;
  77     int     highCnt;
  78     int     swapper;
  79     int     counter;
  80     int     bitBuffer;
  81     int     dropPosition;
  82     uint8_t *output;
  83 } Uart;
  84
  85 static RAMFUNC int OutOfNDecoding(int bit)
  86 {
  87         //int error = 0;
  88         int bitright;
  89
  90         if(!Uart.bitBuffer) {
  91                 Uart.bitBuffer = bit ^ 0xFF0;
  92                 return FALSE;
  93         }
  94         else {
  95                 Uart.bitBuffer <<= 4;
  96                 Uart.bitBuffer ^= bit;
  97         }
  98
  99         /*if(Uart.swapper) {
 100                 Uart.output[Uart.byteCnt] = Uart.bitBuffer & 0xFF;
 101                 Uart.byteCnt++;
 102                 Uart.swapper = 0;
 103                 if(Uart.byteCnt > 15) { return TRUE; }
 104         }
 105         else {
 106                 Uart.swapper = 1;
 107         }*/
 108
 109         if(Uart.state != STATE_UNSYNCD) {
 110                 Uart.posCnt++;
 111
 112                 if((Uart.bitBuffer & Uart.syncBit) ^ Uart.syncBit) {
 113                         bit = 0x00;
 114                 }
 115                 else {
 116                         bit = 0x01;
 117                 }
 118                 if(((Uart.bitBuffer << 1) & Uart.syncBit) ^ Uart.syncBit) {
 119                         bitright = 0x00;
 120                 }
 121                 else {
 122                         bitright = 0x01;
 123                 }
 124                 if(bit != bitright) { bit = bitright; }
 125
 126
 127                 // So, now we only have to deal with *bit*, lets see...
 128                 if(Uart.posCnt == 1) {
 129                         // measurement first half bitperiod
 130                         if(!bit) {
 131                                 // Drop in first half means that we are either seeing
 132                                 // an SOF or an EOF.
 133
 134                                 if(Uart.nOutOfCnt == 1) {
 135                                         // End of Communication
 136                                         Uart.state = STATE_UNSYNCD;
 137                                         Uart.highCnt = 0;
 138                                         if(Uart.byteCnt == 0) {
 139                                                 // Its not straightforward to show single EOFs
 140                                                 // So just leave it and do not return TRUE
 141                                                 Uart.output[0] = 0xf0;
 142                                                 Uart.byteCnt++;
 143                                         }
 144                                         else {
 145                                                 return TRUE;
 146                                         }
 147                                 }
 148                                 else if(Uart.state != STATE_START_OF_COMMUNICATION) {
 149                                         // When not part of SOF or EOF, it is an error
 150                                         Uart.state = STATE_UNSYNCD;
 151                                         Uart.highCnt = 0;
 152                                         //error = 4;
 153                                 }
 154                         }
 155                 }
 156                 else {
 157                         // measurement second half bitperiod
 158                         // Count the bitslot we are in... (ISO 15693)
 159                         Uart.nOutOfCnt++;
 160
 161                         if(!bit) {
 162                                 if(Uart.dropPosition) {
 163                                         if(Uart.state == STATE_START_OF_COMMUNICATION) {
 164                                                 //error = 1;
 165                                         }
 166                                         else {
 167                                                 //error = 7;
 168                                         }
 169                                         // It is an error if we already have seen a drop in current frame
 170                                         Uart.state = STATE_UNSYNCD;
 171                                         Uart.highCnt = 0;
 172                                 }
 173                                 else {
 174                                         Uart.dropPosition = Uart.nOutOfCnt;
 175                                 }
 176                         }
 177
 178                         Uart.posCnt = 0;
 179
 180
 181                         if(Uart.nOutOfCnt == Uart.OutOfCnt && Uart.OutOfCnt == 4) {
 182                                 Uart.nOutOfCnt = 0;
 183
 184                                 if(Uart.state == STATE_START_OF_COMMUNICATION) {
 185                                         if(Uart.dropPosition == 4) {
 186                                                 Uart.state = STATE_RECEIVING;
 187                                                 Uart.OutOfCnt = 256;
 188                                         }
 189                                         else if(Uart.dropPosition == 3) {
 190                                                 Uart.state = STATE_RECEIVING;
 191                                                 Uart.OutOfCnt = 4;
 192                                                 //Uart.output[Uart.byteCnt] = 0xdd;
 193                                                 //Uart.byteCnt++;
 194                                         }
 195                                         else {
 196                                                 Uart.state = STATE_UNSYNCD;
 197                                                 Uart.highCnt = 0;
 198                                         }
 199                                         Uart.dropPosition = 0;
 200                                 }
 201                                 else {
 202                                         // RECEIVING DATA
 203                                         // 1 out of 4
 204                                         if(!Uart.dropPosition) {
 205                                                 Uart.state = STATE_UNSYNCD;
 206                                                 Uart.highCnt = 0;
 207                                                 //error = 9;
 208                                         }
 209                                         else {
 210                                                 Uart.shiftReg >>= 2;
 211
 212                                                 // Swap bit order
 213                                                 Uart.dropPosition--;
 214                                                 //if(Uart.dropPosition == 1) { Uart.dropPosition = 2; }
 215                                                 //else if(Uart.dropPosition == 2) { Uart.dropPosition = 1; }
 216
 217                                                 Uart.shiftReg ^= ((Uart.dropPosition & 0x03) << 6);
 218                                                 Uart.bitCnt += 2;
 219                                                 Uart.dropPosition = 0;
 220
 221                                                 if(Uart.bitCnt == 8) {
 222                                                         Uart.output[Uart.byteCnt] = (Uart.shiftReg & 0xff);
 223                                                         Uart.byteCnt++;
 224                                                         Uart.bitCnt = 0;
 225                                                         Uart.shiftReg = 0;
 226                                                 }
 227                                         }
 228                                 }
 229                         }
 230                         else if(Uart.nOutOfCnt == Uart.OutOfCnt) {
 231                                 // RECEIVING DATA
 232                                 // 1 out of 256
 233                                 if(!Uart.dropPosition) {
 234                                         Uart.state = STATE_UNSYNCD;
 235                                         Uart.highCnt = 0;
 236                                         //error = 3;
 237                                 }
 238                                 else {
 239                                         Uart.dropPosition--;
 240                                         Uart.output[Uart.byteCnt] = (Uart.dropPosition & 0xff);
 241                                         Uart.byteCnt++;
 242                                         Uart.bitCnt = 0;
 243                                         Uart.shiftReg = 0;
 244                                         Uart.nOutOfCnt = 0;
 245                                         Uart.dropPosition = 0;
 246                                 }
 247                         }
 248
 249                         /*if(error) {
 250                                 Uart.output[Uart.byteCnt] = 0xAA;
 251                                 Uart.byteCnt++;
 252                                 Uart.output[Uart.byteCnt] = error & 0xFF;
 253                                 Uart.byteCnt++;
 254                                 Uart.output[Uart.byteCnt] = 0xAA;
 255                                 Uart.byteCnt++;
 256                                 Uart.output[Uart.byteCnt] = (Uart.bitBuffer >> 8) & 0xFF;
 257                                 Uart.byteCnt++;
 258                                 Uart.output[Uart.byteCnt] = Uart.bitBuffer & 0xFF;
 259                                 Uart.byteCnt++;
 260                                 Uart.output[Uart.byteCnt] = (Uart.syncBit >> 3) & 0xFF;
 261                                 Uart.byteCnt++;
 262                                 Uart.output[Uart.byteCnt] = 0xAA;
 263                                 Uart.byteCnt++;
 264                                 return TRUE;
 265                         }*/
 266                 }
 267
 268         }
 269         else {
 270                 bit = Uart.bitBuffer & 0xf0;
 271                 bit >>= 4;
 272                 bit ^= 0x0F; // drops become 1s ;-)
 273                 if(bit) {
 274                         // should have been high or at least (4 * 128) / fc
 275                         // according to ISO this should be at least (9 * 128 + 20) / fc
 276                         if(Uart.highCnt == 8) {
 277                                 // we went low, so this could be start of communication
 278                                 // it turns out to be safer to choose a less significant
 279                                 // syncbit... so we check whether the neighbour also represents the drop
 280                                 Uart.posCnt = 1;   // apparently we are busy with our first half bit period
 281                                 Uart.syncBit = bit & 8;
 282                                 Uart.samples = 3;
 283                                 if(!Uart.syncBit)       { Uart.syncBit = bit & 4; Uart.samples = 2; }
 284                                 else if(bit & 4)        { Uart.syncBit = bit & 4; Uart.samples = 2; bit <<= 2; }
 285                                 if(!Uart.syncBit)       { Uart.syncBit = bit & 2; Uart.samples = 1; }
 286                                 else if(bit & 2)        { Uart.syncBit = bit & 2; Uart.samples = 1; bit <<= 1; }
 287                                 if(!Uart.syncBit)       { Uart.syncBit = bit & 1; Uart.samples = 0;
 288                                         if(Uart.syncBit && (Uart.bitBuffer & 8)) {
 289                                                 Uart.syncBit = 8;
 290
 291                                                 // the first half bit period is expected in next sample
 292                                                 Uart.posCnt = 0;
 293                                                 Uart.samples = 3;
 294                                         }
 295                                 }
 296                                 else if(bit & 1)        { Uart.syncBit = bit & 1; Uart.samples = 0; }
 297
 298                                 Uart.syncBit <<= 4;
 299                                 Uart.state = STATE_START_OF_COMMUNICATION;
 300                                 Uart.bitCnt = 0;
 301                                 Uart.byteCnt = 0;
 302                                 Uart.nOutOfCnt = 0;
 303                                 Uart.OutOfCnt = 4; // Start at 1/4, could switch to 1/256
 304                                 Uart.dropPosition = 0;
 305                                 Uart.shiftReg = 0;
 306                                 //error = 0;
 307                         }
 308                         else {
 309                                 Uart.highCnt = 0;
 310                         }
 311                 }
 312                 else {
 313                         if(Uart.highCnt < 8) {
 314                                 Uart.highCnt++;
 315                         }
 316                 }
 317         }
 318
 319     return FALSE;
 320 }
 321
 322 //=============================================================================
 323 // Manchester
 324 //=============================================================================
 325
 326 static struct {
 327     enum {
 328         DEMOD_UNSYNCD,
 329                 DEMOD_START_OF_COMMUNICATION,
 330                 DEMOD_START_OF_COMMUNICATION2,
 331                 DEMOD_START_OF_COMMUNICATION3,
 332                 DEMOD_SOF_COMPLETE,
 333                 DEMOD_MANCHESTER_D,
 334                 DEMOD_MANCHESTER_E,
 335                 DEMOD_END_OF_COMMUNICATION,
 336                 DEMOD_END_OF_COMMUNICATION2,
 337                 DEMOD_MANCHESTER_F,
 338         DEMOD_ERROR_WAIT
 339     }       state;
 340     int     bitCount;
 341     int     posCount;
 342         int     syncBit;
 343     uint16_t    shiftReg;
 344         int     buffer;
 345         int     buffer2;
 346         int     buffer3;
 347         int     buff;
 348         int     samples;
 349     int     len;
 350         enum {
 351                 SUB_NONE,
 352                 SUB_FIRST_HALF,
 353                 SUB_SECOND_HALF,
 354                 SUB_BOTH
 355         }               sub;
 356     uint8_t *output;
 357 } Demod;
 358
 359 static RAMFUNC int ManchesterDecoding(int v)
 360 {
 361         int bit;
 362         int modulation;
 363         int error = 0;
 364
 365         bit = Demod.buffer;
 366         Demod.buffer = Demod.buffer2;
 367         Demod.buffer2 = Demod.buffer3;
 368         Demod.buffer3 = v;
 369
 370         if(Demod.buff < 3) {
 371                 Demod.buff++;
 372                 return FALSE;
 373         }
 374
 375         if(Demod.state==DEMOD_UNSYNCD) {
 376                 Demod.output[Demod.len] = 0xfa;
 377                 Demod.syncBit = 0;
 378                 //Demod.samples = 0;
 379                 Demod.posCount = 1;             // This is the first half bit period, so after syncing handle the second part
 380
 381                 if(bit & 0x08) {
 382                         Demod.syncBit = 0x08;
 383                 }
 384
 385                 if(bit & 0x04) {
 386                         if(Demod.syncBit) {
 387                                 bit <<= 4;
 388                         }
 389                         Demod.syncBit = 0x04;
 390                 }
 391
 392                 if(bit & 0x02) {
 393                         if(Demod.syncBit) {
 394                                 bit <<= 2;
 395                         }
 396                         Demod.syncBit = 0x02;
 397                 }
 398
 399                 if(bit & 0x01 && Demod.syncBit) {
 400                         Demod.syncBit = 0x01;
 401                 }
 402
 403                 if(Demod.syncBit) {
 404                         Demod.len = 0;
 405                         Demod.state = DEMOD_START_OF_COMMUNICATION;
 406                         Demod.sub = SUB_FIRST_HALF;
 407                         Demod.bitCount = 0;
 408                         Demod.shiftReg = 0;
 409                         Demod.samples = 0;
 410                         if(Demod.posCount) {
 411                                 //if(trigger) LED_A_OFF();  // Not useful in this case...
 412                                 switch(Demod.syncBit) {
 413                                         case 0x08: Demod.samples = 3; break;
 414                                         case 0x04: Demod.samples = 2; break;
 415                                         case 0x02: Demod.samples = 1; break;
 416                                         case 0x01: Demod.samples = 0; break;
 417                                 }
 418                                 // SOF must be long burst... otherwise stay unsynced!!!
 419                                 if(!(Demod.buffer & Demod.syncBit) || !(Demod.buffer2 & Demod.syncBit)) {
 420                                         Demod.state = DEMOD_UNSYNCD;
 421                                 }
 422                         }
 423                         else {
 424                                 // SOF must be long burst... otherwise stay unsynced!!!
 425                                 if(!(Demod.buffer2 & Demod.syncBit) || !(Demod.buffer3 & Demod.syncBit)) {
 426                                         Demod.state = DEMOD_UNSYNCD;
 427                                         error = 0x88;
 428                                 }
 429
 430                         }
 431                         error = 0;
 432
 433                 }
 434         }
 435         else {
 436                 modulation = bit & Demod.syncBit;
 437                 modulation |= ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
 438
 439                 Demod.samples += 4;
 440
 441                 if(Demod.posCount==0) {
 442                         Demod.posCount = 1;
 443                         if(modulation) {
 444                                 Demod.sub = SUB_FIRST_HALF;
 445                         }
 446                         else {
 447                                 Demod.sub = SUB_NONE;
 448                         }
 449                 }
 450                 else {
 451                         Demod.posCount = 0;
 452                         /*(modulation && (Demod.sub == SUB_FIRST_HALF)) {
 453                                 if(Demod.state!=DEMOD_ERROR_WAIT) {
 454                                         Demod.state = DEMOD_ERROR_WAIT;
 455                                         Demod.output[Demod.len] = 0xaa;
 456                                         error = 0x01;
 457                                 }
 458                         }*/
 459                         //else if(modulation) {
 460                         if(modulation) {
 461                                 if(Demod.sub == SUB_FIRST_HALF) {
 462                                         Demod.sub = SUB_BOTH;
 463                                 }
 464                                 else {
 465                                         Demod.sub = SUB_SECOND_HALF;
 466                                 }
 467                         }
 468                         else if(Demod.sub == SUB_NONE) {
 469                                 if(Demod.state == DEMOD_SOF_COMPLETE) {
 470                                         Demod.output[Demod.len] = 0x0f;
 471                                         Demod.len++;
 472                                         Demod.state = DEMOD_UNSYNCD;
 473 //                                      error = 0x0f;
 474                                         return TRUE;
 475                                 }
 476                                 else {
 477                                         Demod.state = DEMOD_ERROR_WAIT;
 478                                         error = 0x33;
 479                                 }
 480                                 /*if(Demod.state!=DEMOD_ERROR_WAIT) {
 481                                         Demod.state = DEMOD_ERROR_WAIT;
 482                                         Demod.output[Demod.len] = 0xaa;
 483                                         error = 0x01;
 484                                 }*/
 485                         }
 486
 487                         switch(Demod.state) {
 488                                 case DEMOD_START_OF_COMMUNICATION:
 489                                         if(Demod.sub == SUB_BOTH) {
 490                                                 //Demod.state = DEMOD_MANCHESTER_D;
 491                                                 Demod.state = DEMOD_START_OF_COMMUNICATION2;
 492                                                 Demod.posCount = 1;
 493                                                 Demod.sub = SUB_NONE;
 494                                         }
 495                                         else {
 496                                                 Demod.output[Demod.len] = 0xab;
 497                                                 Demod.state = DEMOD_ERROR_WAIT;
 498                                                 error = 0xd2;
 499                                         }
 500                                         break;
 501                                 case DEMOD_START_OF_COMMUNICATION2:
 502                                         if(Demod.sub == SUB_SECOND_HALF) {
 503                                                 Demod.state = DEMOD_START_OF_COMMUNICATION3;
 504                                         }
 505                                         else {
 506                                                 Demod.output[Demod.len] = 0xab;
 507                                                 Demod.state = DEMOD_ERROR_WAIT;
 508                                                 error = 0xd3;
 509                                         }
 510                                         break;
 511                                 case DEMOD_START_OF_COMMUNICATION3:
 512                                         if(Demod.sub == SUB_SECOND_HALF) {
 513 //                                              Demod.state = DEMOD_MANCHESTER_D;
 514                                                 Demod.state = DEMOD_SOF_COMPLETE;
 515                                                 //Demod.output[Demod.len] = Demod.syncBit & 0xFF;
 516                                                 //Demod.len++;
 517                                         }
 518                                         else {
 519                                                 Demod.output[Demod.len] = 0xab;
 520                                                 Demod.state = DEMOD_ERROR_WAIT;
 521                                                 error = 0xd4;
 522                                         }
 523                                         break;
 524                                 case DEMOD_SOF_COMPLETE:
 525                                 case DEMOD_MANCHESTER_D:
 526                                 case DEMOD_MANCHESTER_E:
 527                                         // OPPOSITE FROM ISO14443 - 11110000 = 0 (1 in 14443)
 528                                         //                          00001111 = 1 (0 in 14443)
 529                                         if(Demod.sub == SUB_SECOND_HALF) { // SUB_FIRST_HALF
 530                                                 Demod.bitCount++;
 531                                                 Demod.shiftReg = (Demod.shiftReg >> 1) ^ 0x100;
 532                                                 Demod.state = DEMOD_MANCHESTER_D;
 533                                         }
 534                                         else if(Demod.sub == SUB_FIRST_HALF) { // SUB_SECOND_HALF
 535                                                 Demod.bitCount++;
 536                                                 Demod.shiftReg >>= 1;
 537                                                 Demod.state = DEMOD_MANCHESTER_E;
 538                                         }
 539                                         else if(Demod.sub == SUB_BOTH) {
 540                                                 Demod.state = DEMOD_MANCHESTER_F;
 541                                         }
 542                                         else {
 543                                                 Demod.state = DEMOD_ERROR_WAIT;
 544                                                 error = 0x55;
 545                                         }
 546                                         break;
 547
 548                                 case DEMOD_MANCHESTER_F:
 549                                         // Tag response does not need to be a complete byte!
 550                                         if(Demod.len > 0 || Demod.bitCount > 0) {
 551                                                 if(Demod.bitCount > 1) {  // was > 0, do not interpret last closing bit, is part of EOF
 552                                                         Demod.shiftReg >>= (9 - Demod.bitCount);        // right align data
 553                                                         Demod.output[Demod.len] = Demod.shiftReg & 0xff;
 554                                                         Demod.len++;
 555                                                 }
 556
 557                                                 Demod.state = DEMOD_UNSYNCD;
 558                                                 return TRUE;
 559                                         }
 560                                         else {
 561                                                 Demod.output[Demod.len] = 0xad;
 562                                                 Demod.state = DEMOD_ERROR_WAIT;
 563                                                 error = 0x03;
 564                                         }
 565                                         break;
 566
 567                                 case DEMOD_ERROR_WAIT:
 568                                         Demod.state = DEMOD_UNSYNCD;
 569                                         break;
 570
 571                                 default:
 572                                         Demod.output[Demod.len] = 0xdd;
 573                                         Demod.state = DEMOD_UNSYNCD;
 574                                         break;
 575                         }
 576
 577                         /*if(Demod.bitCount>=9) {
 578                                 Demod.output[Demod.len] = Demod.shiftReg & 0xff;
 579                                 Demod.len++;
 580
 581                                 Demod.parityBits <<= 1;
 582                                 Demod.parityBits ^= ((Demod.shiftReg >> 8) & 0x01);
 583
 584                                 Demod.bitCount = 0;
 585                                 Demod.shiftReg = 0;
 586                         }*/
 587                         if(Demod.bitCount>=8) {
 588                                 Demod.shiftReg >>= 1;
 589                                 Demod.output[Demod.len] = (Demod.shiftReg & 0xff);
 590                                 Demod.len++;
 591                                 Demod.bitCount = 0;
 592                                 Demod.shiftReg = 0;
 593                         }
 594
 595                         if(error) {
 596                                 Demod.output[Demod.len] = 0xBB;
 597                                 Demod.len++;
 598                                 Demod.output[Demod.len] = error & 0xFF;
 599                                 Demod.len++;
 600                                 Demod.output[Demod.len] = 0xBB;
 601                                 Demod.len++;
 602                                 Demod.output[Demod.len] = bit & 0xFF;
 603                                 Demod.len++;
 604                                 Demod.output[Demod.len] = Demod.buffer & 0xFF;
 605                                 Demod.len++;
 606                                 // Look harder ;-)
 607                                 Demod.output[Demod.len] = Demod.buffer2 & 0xFF;
 608                                 Demod.len++;
 609                                 Demod.output[Demod.len] = Demod.syncBit & 0xFF;
 610                                 Demod.len++;
 611                                 Demod.output[Demod.len] = 0xBB;
 612                                 Demod.len++;
 613                                 return TRUE;
 614                         }
 615
 616                 }
 617
 618         } // end (state != UNSYNCED)
 619
 620     return FALSE;
 621 }
 622
 623 //=============================================================================
 624 // Finally, a `sniffer' for iClass communication
 625 // Both sides of communication!
 626 //=============================================================================
 627
 628 //-----------------------------------------------------------------------------
 629 // Record the sequence of commands sent by the reader to the tag, with
 630 // triggering so that we start recording at the point that the tag is moved
 631 // near the reader.
 632 //-----------------------------------------------------------------------------
 633 void RAMFUNC SnoopIClass(void)
 634 {
 635
 636
 637     // We won't start recording the frames that we acquire until we trigger;
 638     // a good trigger condition to get started is probably when we see a
 639     // response from the tag.
 640     //int triggered = FALSE; // FALSE to wait first for card
 641
 642     // The command (reader -> tag) that we're receiving.
 643         // The length of a received command will in most cases be no more than 18 bytes.
 644         // So 32 should be enough!
 645         #define ICLASS_BUFFER_SIZE 32
 646         uint8_t readerToTagCmd[ICLASS_BUFFER_SIZE];
 647     // The response (tag -> reader) that we're receiving.
 648         uint8_t tagToReaderResponse[ICLASS_BUFFER_SIZE];
 649
 650     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 651
 652         // free all BigBuf memory
 653         BigBuf_free();
 654     // The DMA buffer, used to stream samples from the FPGA
 655     uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
 656
 657         set_tracing(TRUE);
 658         clear_trace();
 659     iso14a_set_trigger(FALSE);
 660
 661         int lastRxCounter;
 662     uint8_t *upTo;
 663     int smpl;
 664     int maxBehindBy = 0;
 665
 666     // Count of samples received so far, so that we can include timing
 667     // information in the trace buffer.
 668     int samples = 0;
 669     rsamples = 0;
 670
 671     // Set up the demodulator for tag -> reader responses.
 672         Demod.output = tagToReaderResponse;
 673     Demod.len = 0;
 674     Demod.state = DEMOD_UNSYNCD;
 675
 676     // Setup for the DMA.
 677     FpgaSetupSsc();
 678     upTo = dmaBuf;
 679     lastRxCounter = DMA_BUFFER_SIZE;
 680     FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
 681
 682     // And the reader -> tag commands
 683     memset(&Uart, 0, sizeof(Uart));
 684         Uart.output = readerToTagCmd;
 685     Uart.byteCntMax = 32; // was 100 (greg)////////////////////////////////////////////////////////////////////////
 686     Uart.state = STATE_UNSYNCD;
 687
 688     // And put the FPGA in the appropriate mode
 689     // Signal field is off with the appropriate LED
 690     LED_D_OFF();
 691     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
 692     SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 693
 694         uint32_t time_0 = GetCountSspClk();
 695         uint32_t time_start = 0;
 696         uint32_t time_stop  = 0;
 697
 698     int div = 0;
 699     //int div2 = 0;
 700     int decbyte = 0;
 701     int decbyter = 0;
 702
 703     // And now we loop, receiving samples.
 704     for(;;) {
 705         LED_A_ON();
 706         WDT_HIT();
 707         int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
 708                                 (DMA_BUFFER_SIZE-1);
 709         if(behindBy > maxBehindBy) {
 710             maxBehindBy = behindBy;
 711             if(behindBy > (9 * DMA_BUFFER_SIZE / 10)) {
 712                 Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
 713                 goto done;
 714             }
 715         }
 716         if(behindBy < 1) continue;
 717
 718         LED_A_OFF();
 719         smpl = upTo[0];
 720         upTo++;
 721         lastRxCounter -= 1;
 722         if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
 723             upTo -= DMA_BUFFER_SIZE;
 724             lastRxCounter += DMA_BUFFER_SIZE;
 725             AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
 726             AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
 727         }
 728
 729         //samples += 4;
 730         samples += 1;
 731
 732         if(smpl & 0xF) {
 733                 decbyte ^= (1 << (3 - div));
 734         }
 735
 736         // FOR READER SIDE COMMUMICATION...
 737
 738         decbyter <<= 2;
 739         decbyter ^= (smpl & 0x30);
 740
 741         div++;
 742
 743         if((div + 1) % 2 == 0) {
 744                 smpl = decbyter;
 745                 if(OutOfNDecoding((smpl & 0xF0) >> 4)) {
 746                     rsamples = samples - Uart.samples;
 747                         time_stop = (GetCountSspClk()-time_0) << 4;
 748                     LED_C_ON();
 749
 750                         //if(!LogTrace(Uart.output,Uart.byteCnt, rsamples, Uart.parityBits,TRUE)) break;
 751                         //if(!LogTrace(NULL, 0, Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, 0, TRUE)) break;
 752                         if(tracing)     {
 753                                 uint8_t parity[MAX_PARITY_SIZE];
 754                                 GetParity(Uart.output, Uart.byteCnt, parity);
 755                                 LogTrace(Uart.output,Uart.byteCnt, time_start, time_stop, parity, TRUE);
 756                         }
 757
 758
 759                         /* And ready to receive another command. */
 760                     Uart.state = STATE_UNSYNCD;
 761                     /* And also reset the demod code, which might have been */
 762                     /* false-triggered by the commands from the reader. */
 763                     Demod.state = DEMOD_UNSYNCD;
 764                     LED_B_OFF();
 765                     Uart.byteCnt = 0;
 766                 }else{
 767                         time_start = (GetCountSspClk()-time_0) << 4;
 768                 }
 769                 decbyter = 0;
 770         }
 771
 772         if(div > 3) {
 773                 smpl = decbyte;
 774                 if(ManchesterDecoding(smpl & 0x0F)) {
 775                         time_stop = (GetCountSspClk()-time_0) << 4;
 776
 777                         rsamples = samples - Demod.samples;
 778                     LED_B_ON();
 779
 780                         if(tracing)     {
 781                                 uint8_t parity[MAX_PARITY_SIZE];
 782                                 GetParity(Demod.output, Demod.len, parity);
 783                                 LogTrace(Demod.output, Demod.len, time_start, time_stop, parity, FALSE);
 784                         }
 785
 786                     // And ready to receive another response.
 787                     memset(&Demod, 0, sizeof(Demod));
 788                         Demod.output = tagToReaderResponse;
 789                     Demod.state = DEMOD_UNSYNCD;
 790                     LED_C_OFF();
 791                 }else{
 792                         time_start = (GetCountSspClk()-time_0) << 4;
 793                 }
 794
 795                 div = 0;
 796                 decbyte = 0x00;
 797         }
 798         //}
 799
 800         if(BUTTON_PRESS()) {
 801             DbpString("cancelled_a");
 802             goto done;
 803         }
 804     }
 805
 806     DbpString("COMMAND FINISHED");
 807
 808     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
 809         Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);
 810
 811 done:
 812     AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
 813     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
 814         Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);
 815     LED_A_OFF();
 816     LED_B_OFF();
 817     LED_C_OFF();
 818     LED_D_OFF();
 819 }
 820
 821 void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {
 822         int i;
 823         for(i = 0; i < 8; i++) {
 824                 rotatedCSN[i] = (originalCSN[i] >> 3) | (originalCSN[(i+1)%8] << 5);
 825         }
 826 }
 827
 828 //-----------------------------------------------------------------------------
 829 // Wait for commands from reader
 830 // Stop when button is pressed
 831 // Or return TRUE when command is captured
 832 //-----------------------------------------------------------------------------
 833 static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
 834 {
 835     // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen
 836     // only, since we are receiving, not transmitting).
 837     // Signal field is off with the appropriate LED
 838     LED_D_OFF();
 839     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
 840
 841     // Now run a `software UART' on the stream of incoming samples.
 842     Uart.output = received;
 843     Uart.byteCntMax = maxLen;
 844     Uart.state = STATE_UNSYNCD;
 845
 846     for(;;) {
 847         WDT_HIT();
 848
 849         if(BUTTON_PRESS()) return FALSE;
 850
 851         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
 852             AT91C_BASE_SSC->SSC_THR = 0x00;
 853         }
 854         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
 855             uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
 856
 857                         if(OutOfNDecoding(b & 0x0f)) {
 858                                 *len = Uart.byteCnt;
 859                                 return TRUE;
 860                         }
 861         }
 862     }
 863 }
 864
 865 static uint8_t encode4Bits(const uint8_t b)
 866 {
 867         uint8_t c = b & 0xF;
 868         // OTA, the least significant bits first
 869         //         The columns are
 870         //               1 - Bit value to send
 871         //               2 - Reversed (big-endian)
 872         //               3 - Encoded
 873         //               4 - Hex values
 874
 875         switch(c){
 876         //                          1       2         3         4
 877           case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55
 878           case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95
 879           case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65
 880           case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5
 881           case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59
 882           case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99
 883           case 9:  return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69
 884           case 8:  return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9
 885           case 7:  return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56
 886           case 6:  return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96
 887           case 5:  return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66
 888           case 4:  return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6
 889           case 3:  return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a
 890           case 2:  return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a
 891           case 1:  return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a
 892           default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa
 893
 894         }
 895 }
 896
 897 //-----------------------------------------------------------------------------
 898 // Prepare tag messages
 899 //-----------------------------------------------------------------------------
 900 static void CodeIClassTagAnswer(const uint8_t *cmd, int len)
 901 {
 902
 903         /*
 904          * SOF comprises 3 parts;
 905          * * An unmodulated time of 56.64 us
 906          * * 24 pulses of 423.75 KHz (fc/32)
 907          * * A logic 1, which starts with an unmodulated time of 18.88us
 908          *   followed by 8 pulses of 423.75kHz (fc/32)
 909          *
 910          *
 911          * EOF comprises 3 parts:
 912          * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated
 913          *   time of 18.88us.
 914          * - 24 pulses of fc/32
 915          * - An unmodulated time of 56.64 us
 916          *
 917          *
 918          * A logic 0 starts with 8 pulses of fc/32
 919          * followed by an unmodulated time of 256/fc (~18,88us).
 920          *
 921          * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by
 922          * 8 pulses of fc/32 (also 18.88us)
 923          *
 924          * The mode FPGA_HF_SIMULATOR_MODULATE_424K_8BIT which we use to simulate tag,
 925          * works like this.
 926          * - A 1-bit input to the FPGA becomes 8 pulses on 423.5kHz (fc/32) (18.88us).
 927          * - A 0-bit inptu to the FPGA becomes an unmodulated time of 18.88us
 928          *
 929          * In this mode the SOF can be written as 00011101 = 0x1D
 930          * The EOF can be written as 10111000 = 0xb8
 931          * A logic 1 is 01
 932          * A logic 0 is 10
 933          *
 934          * */
 935
 936         int i;
 937
 938         ToSendReset();
 939
 940         // Send SOF
 941         ToSend[++ToSendMax] = 0x1D;
 942
 943         for(i = 0; i < len; i++) {
 944                 uint8_t b = cmd[i];
 945                 ToSend[++ToSendMax] = encode4Bits(b & 0xF); //Least significant half
 946                 ToSend[++ToSendMax] = encode4Bits((b >>4) & 0xF);//Most significant half
 947         }
 948
 949         // Send EOF
 950         ToSend[++ToSendMax] = 0xB8;
 951         //lastProxToAirDuration  = 8*ToSendMax - 3*8 - 3*8;//Not counting zeroes in the beginning or end
 952         // Convert from last byte pos to length
 953         ToSendMax++;
 954 }
 955
 956 // Only SOF
 957 static void CodeIClassTagSOF()
 958 {
 959         //So far a dummy implementation, not used
 960         //int lastProxToAirDuration =0;
 961
 962         ToSendReset();
 963         // Send SOF
 964         ToSend[++ToSendMax] = 0x1D;
 965 //      lastProxToAirDuration  = 8*ToSendMax - 3*8;//Not counting zeroes in the beginning
 966
 967         // Convert from last byte pos to length
 968         ToSendMax++;
 969 }
 970 #define MODE_SIM_CSN        0
 971 #define MODE_EXIT_AFTER_MAC 1
 972 #define MODE_FULLSIM        2
 973
 974 int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf);
 975 /**
 976  * @brief SimulateIClass simulates an iClass card.
 977  * @param arg0 type of simulation
 978  *                      - 0 uses the first 8 bytes in usb data as CSN
 979  *                      - 2 "dismantling iclass"-attack. This mode iterates through all CSN's specified
 980  *                      in the usb data. This mode collects MAC from the reader, in order to do an offline
 981  *                      attack on the keys. For more info, see "dismantling iclass" and proxclone.com.
 982  *                      - Other : Uses the default CSN (031fec8af7ff12e0)
 983  * @param arg1 - number of CSN's contained in datain (applicable for mode 2 only)
 984  * @param arg2
 985  * @param datain
 986  */
 987 void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain)
 988 {
 989         uint32_t simType = arg0;
 990         uint32_t numberOfCSNS = arg1;
 991         FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 992
 993         // Enable and clear the trace
 994         set_tracing(TRUE);
 995         clear_trace();
 996         //Use the emulator memory for SIM
 997         uint8_t *emulator = BigBuf_get_EM_addr();
 998
 999         if(simType == 0) {
1000                 // Use the CSN from commandline
1001                 memcpy(emulator, datain, 8);
1002                 doIClassSimulation(MODE_SIM_CSN,NULL);
1003         }else if(simType == 1)
1004         {
1005                 //Default CSN
1006                 uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
1007                 // Use the CSN from commandline
1008                 memcpy(emulator, csn_crc, 8);
1009                 doIClassSimulation(MODE_SIM_CSN,NULL);
1010         }
1011         else if(simType == 2)
1012         {
1013
1014                 uint8_t mac_responses[USB_CMD_DATA_SIZE] = { 0 };
1015                 Dbprintf("Going into attack mode, %d CSNS sent", numberOfCSNS);
1016                 // In this mode, a number of csns are within datain. We'll simulate each one, one at a time
1017                 // in order to collect MAC's from the reader. This can later be used in an offlne-attack
1018                 // in order to obtain the keys, as in the "dismantling iclass"-paper.
1019                 int i = 0;
1020                 for( ; i < numberOfCSNS && i*8+8 < USB_CMD_DATA_SIZE; i++)
1021                 {
1022                         // The usb data is 512 bytes, fitting 65 8-byte CSNs in there.
1023
1024                         memcpy(emulator, datain+(i*8), 8);
1025                         if(doIClassSimulation(MODE_EXIT_AFTER_MAC,mac_responses+i*8))
1026                         {
1027                                 cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);
1028                                 return; // Button pressed
1029                         }
1030                 }
1031                 cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);
1032
1033         }else if(simType == 3){
1034                 //This is 'full sim' mode, where we use the emulator storage for data.
1035                 doIClassSimulation(MODE_FULLSIM, NULL);
1036         }
1037         else{
1038                 // We may want a mode here where we hardcode the csns to use (from proxclone).
1039                 // That will speed things up a little, but not required just yet.
1040                 Dbprintf("The mode is not implemented, reserved for future use");
1041         }
1042         Dbprintf("Done...");
1043
1044 }
1045 void AppendCrc(uint8_t* data, int len)
1046 {
1047         ComputeCrc14443(CRC_ICLASS,data,len,data+len,data+len+1);
1048 }
1049
1050 /**
1051  * @brief Does the actual simulation
1052  * @param csn - csn to use
1053  * @param breakAfterMacReceived if true, returns after reader MAC has been received.
1054  */
1055 int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf)
1056 {
1057         // free eventually allocated BigBuf memory
1058         BigBuf_free_keep_EM();
1059
1060         State cipher_state;
1061 //      State cipher_state_reserve;
1062         uint8_t *csn = BigBuf_get_EM_addr();
1063         uint8_t *emulator = csn;
1064         uint8_t sof_data[] = { 0x0F} ;
1065         // CSN followed by two CRC bytes
1066         uint8_t anticoll_data[10] = { 0 };
1067         uint8_t csn_data[10] = { 0 };
1068         memcpy(csn_data,csn,sizeof(csn_data));
1069         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]);
1070
1071         // Construct anticollision-CSN
1072         rotateCSN(csn_data,anticoll_data);
1073
1074         // Compute CRC on both CSNs
1075         ComputeCrc14443(CRC_ICLASS, anticoll_data, 8, &anticoll_data[8], &anticoll_data[9]);
1076         ComputeCrc14443(CRC_ICLASS, csn_data, 8, &csn_data[8], &csn_data[9]);
1077
1078         uint8_t diversified_key[8] = { 0 };
1079         // e-Purse
1080         uint8_t card_challenge_data[8] = { 0x00 };
1081         if(simulationMode == MODE_FULLSIM)
1082         {
1083                 //The diversified key should be stored on block 3
1084                 //Get the diversified key from emulator memory
1085                 memcpy(diversified_key, emulator+(8*3),8);
1086
1087                 //Card challenge, a.k.a e-purse is on block 2
1088                 memcpy(card_challenge_data,emulator + (8 * 2) , 8);
1089                 //Precalculate the cipher state, feeding it the CC
1090                 cipher_state = opt_doTagMAC_1(card_challenge_data,diversified_key);
1091
1092         }
1093
1094         int exitLoop = 0;
1095         // Reader 0a
1096         // Tag    0f
1097         // Reader 0c
1098         // Tag    anticoll. CSN
1099         // Reader 81 anticoll. CSN
1100         // Tag    CSN
1101
1102         uint8_t *modulated_response;
1103         int modulated_response_size = 0;
1104         uint8_t* trace_data = NULL;
1105         int trace_data_size = 0;
1106
1107
1108         // Respond SOF -- takes 1 bytes
1109         uint8_t *resp_sof = BigBuf_malloc(2);
1110         int resp_sof_Len;
1111
1112         // Anticollision CSN (rotated CSN)
1113         // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
1114         uint8_t *resp_anticoll = BigBuf_malloc(28);
1115         int resp_anticoll_len;
1116
1117         // CSN
1118         // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
1119         uint8_t *resp_csn = BigBuf_malloc(30);
1120         int resp_csn_len;
1121
1122         // e-Purse
1123         // 18: Takes 2 bytes for SOF/EOF and 8 * 2 = 16 bytes (2 bytes/bit)
1124         uint8_t *resp_cc = BigBuf_malloc(20);
1125         int resp_cc_len;
1126
1127         uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
1128         memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
1129         int len;
1130
1131         // Prepare card messages
1132         ToSendMax = 0;
1133
1134         // First card answer: SOF
1135         CodeIClassTagSOF();
1136         memcpy(resp_sof, ToSend, ToSendMax); resp_sof_Len = ToSendMax;
1137
1138         // Anticollision CSN
1139         CodeIClassTagAnswer(anticoll_data, sizeof(anticoll_data));
1140         memcpy(resp_anticoll, ToSend, ToSendMax); resp_anticoll_len = ToSendMax;
1141
1142         // CSN
1143         CodeIClassTagAnswer(csn_data, sizeof(csn_data));
1144         memcpy(resp_csn, ToSend, ToSendMax); resp_csn_len = ToSendMax;
1145
1146         // e-Purse
1147         CodeIClassTagAnswer(card_challenge_data, sizeof(card_challenge_data));
1148         memcpy(resp_cc, ToSend, ToSendMax); resp_cc_len = ToSendMax;
1149
1150         //This is used for responding to READ-block commands or other data which is dynamically generated
1151         //First the 'trace'-data, not encoded for FPGA
1152         uint8_t *data_generic_trace = BigBuf_malloc(8 + 2);//8 bytes data + 2byte CRC is max tag answer
1153         //Then storage for the modulated data
1154         //Each bit is doubled when modulated for FPGA, and we also have SOF and EOF (2 bytes)
1155         uint8_t *data_response = BigBuf_malloc( (8+2) * 2 + 2);
1156
1157         // Start from off (no field generated)
1158         //FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1159         //SpinDelay(200);
1160         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
1161         SpinDelay(100);
1162         StartCountSspClk();
1163         // We need to listen to the high-frequency, peak-detected path.
1164         SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1165         FpgaSetupSsc();
1166
1167         // To control where we are in the protocol
1168         int cmdsRecvd = 0;
1169         uint32_t time_0 = GetCountSspClk();
1170         uint32_t t2r_time =0;
1171         uint32_t r2t_time =0;
1172
1173         LED_A_ON();
1174         bool buttonPressed = false;
1175         uint8_t response_delay = 1;
1176         while(!exitLoop) {
1177                 response_delay = 1;
1178                 LED_B_OFF();
1179                 //Signal tracer
1180                 // Can be used to get a trigger for an oscilloscope..
1181                 LED_C_OFF();
1182
1183                 if(!GetIClassCommandFromReader(receivedCmd, &len, 100)) {
1184                         buttonPressed = true;
1185                         break;
1186                 }
1187                 r2t_time = GetCountSspClk();
1188                 //Signal tracer
1189                 LED_C_ON();
1190
1191                 // Okay, look at the command now.
1192                 if(receivedCmd[0] == ICLASS_CMD_ACTALL ) {
1193                         // Reader in anticollission phase
1194                         modulated_response = resp_sof; modulated_response_size = resp_sof_Len; //order = 1;
1195                         trace_data = sof_data;
1196                         trace_data_size = sizeof(sof_data);
1197                 } else if(receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 1) {
1198                         // Reader asks for anticollission CSN
1199                         modulated_response = resp_anticoll; modulated_response_size = resp_anticoll_len; //order = 2;
1200                         trace_data = anticoll_data;
1201                         trace_data_size = sizeof(anticoll_data);
1202                         //DbpString("Reader requests anticollission CSN:");
1203                 } else if(receivedCmd[0] == ICLASS_CMD_SELECT) {
1204                         // Reader selects anticollission CSN.
1205                         // Tag sends the corresponding real CSN
1206                         modulated_response = resp_csn; modulated_response_size = resp_csn_len; //order = 3;
1207                         trace_data = csn_data;
1208                         trace_data_size = sizeof(csn_data);
1209                         //DbpString("Reader selects anticollission CSN:");
1210                 } else if(receivedCmd[0] == ICLASS_CMD_READCHECK_KD) {
1211                         // Read e-purse (88 02)
1212                         modulated_response = resp_cc; modulated_response_size = resp_cc_len; //order = 4;
1213                         trace_data = card_challenge_data;
1214                         trace_data_size = sizeof(card_challenge_data);
1215                         LED_B_ON();
1216                 } else if(receivedCmd[0] == ICLASS_CMD_CHECK) {
1217                         // Reader random and reader MAC!!!
1218                         if(simulationMode == MODE_FULLSIM)
1219                         {
1220                                 //NR, from reader, is in receivedCmd +1
1221                                 opt_doTagMAC_2(cipher_state,receivedCmd+1,data_generic_trace,diversified_key);
1222
1223                                 trace_data = data_generic_trace;
1224                                 trace_data_size = 4;
1225                                 CodeIClassTagAnswer(trace_data , trace_data_size);
1226                                 memcpy(data_response, ToSend, ToSendMax);
1227                                 modulated_response = data_response;
1228                                 modulated_response_size = ToSendMax;
1229                                 response_delay = 0;//We need to hurry here...
1230                                 //exitLoop = true;
1231                         }else
1232                         {       //Not fullsim, we don't respond
1233                                 // We do not know what to answer, so lets keep quiet
1234                                 modulated_response = resp_sof; modulated_response_size = 0;
1235                                 trace_data = NULL;
1236                                 trace_data_size = 0;
1237                                 if (simulationMode == MODE_EXIT_AFTER_MAC){
1238                                         // dbprintf:ing ...
1239                                         Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x"
1240                                                            ,csn[0],csn[1],csn[2],csn[3],csn[4],csn[5],csn[6],csn[7]);
1241                                         Dbprintf("RDR:  (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",len,
1242                                                         receivedCmd[0], receivedCmd[1], receivedCmd[2],
1243                                                         receivedCmd[3], receivedCmd[4], receivedCmd[5],
1244                                                         receivedCmd[6], receivedCmd[7], receivedCmd[8]);
1245                                         if (reader_mac_buf != NULL)
1246                                         {
1247                                                 memcpy(reader_mac_buf,receivedCmd+1,8);
1248                                         }
1249                                         exitLoop = true;
1250                                 }
1251                         }
1252
1253                 } else if(receivedCmd[0] == ICLASS_CMD_HALT && len == 1) {
1254                         // Reader ends the session
1255                         modulated_response = resp_sof; modulated_response_size = 0; //order = 0;
1256                         trace_data = NULL;
1257                         trace_data_size = 0;
1258                 } else if(simulationMode == MODE_FULLSIM && receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 4){
1259                         //Read block
1260                         uint16_t blk = receivedCmd[1];
1261                         //Take the data...
1262                         memcpy(data_generic_trace, emulator+(blk << 3),8);
1263                         //Add crc
1264                         AppendCrc(data_generic_trace, 8);
1265                         trace_data = data_generic_trace;
1266                         trace_data_size = 10;
1267                         CodeIClassTagAnswer(trace_data , trace_data_size);
1268                         memcpy(data_response, ToSend, ToSendMax);
1269                         modulated_response = data_response;
1270                         modulated_response_size = ToSendMax;
1271                 }else if(receivedCmd[0] == ICLASS_CMD_UPDATE && simulationMode == MODE_FULLSIM)
1272                 {//Probably the reader wants to update the nonce. Let's just ignore that for now.
1273                         // OBS! If this is implemented, don't forget to regenerate the cipher_state
1274                         //We're expected to respond with the data+crc, exactly what's already in the receivedcmd
1275                         //receivedcmd is now UPDATE 1b | ADDRESS 1b| DATA 8b| Signature 4b or CRC 2b|
1276
1277                         //Take the data...
1278                         memcpy(data_generic_trace, receivedCmd+2,8);
1279                         //Add crc
1280                         AppendCrc(data_generic_trace, 8);
1281                         trace_data = data_generic_trace;
1282                         trace_data_size = 10;
1283                         CodeIClassTagAnswer(trace_data , trace_data_size);
1284                         memcpy(data_response, ToSend, ToSendMax);
1285                         modulated_response = data_response;
1286                         modulated_response_size = ToSendMax;
1287                 }
1288                 else if(receivedCmd[0] == ICLASS_CMD_PAGESEL)
1289                 {//Pagesel
1290                         //Pagesel enables to select a page in the selected chip memory and return its configuration block
1291                         //Chips with a single page will not answer to this command
1292                         // It appears we're fine ignoring this.
1293                         //Otherwise, we should answer 8bytes (block) + 2bytes CRC
1294                 }
1295                 else {
1296                         //#db# Unknown command received from reader (len=5): 26 1 0 f6 a 44 44 44 44
1297                         // Never seen this command before
1298                         Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x",
1299                         len,
1300                         receivedCmd[0], receivedCmd[1], receivedCmd[2],
1301                         receivedCmd[3], receivedCmd[4], receivedCmd[5],
1302                         receivedCmd[6], receivedCmd[7], receivedCmd[8]);
1303                         // Do not respond
1304                         modulated_response = resp_sof; modulated_response_size = 0; //order = 0;
1305                         trace_data = NULL;
1306                         trace_data_size = 0;
1307                 }
1308
1309                 if(cmdsRecvd >  100) {
1310                         //DbpString("100 commands later...");
1311                         //break;
1312                 }
1313                 else {
1314                         cmdsRecvd++;
1315                 }
1316                 /**
1317                 A legit tag has about 380us delay between reader EOT and tag SOF.
1318                 **/
1319                 if(modulated_response_size > 0) {
1320                         SendIClassAnswer(modulated_response, modulated_response_size, response_delay);
1321                         t2r_time = GetCountSspClk();
1322                 }
1323
1324                 if (tracing) {
1325                         uint8_t parity[MAX_PARITY_SIZE];
1326                         GetParity(receivedCmd, len, parity);
1327                         LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, (r2t_time-time_0) << 4, parity, TRUE);
1328
1329                         if (trace_data != NULL) {
1330                                 GetParity(trace_data, trace_data_size, parity);
1331                                 LogTrace(trace_data, trace_data_size, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, FALSE);
1332                         }
1333                         if(!tracing) {
1334                                 DbpString("Trace full");
1335                                 //break;
1336                         }
1337
1338                 }
1339                 memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
1340         }
1341
1342         //Dbprintf("%x", cmdsRecvd);
1343         LED_A_OFF();
1344         LED_B_OFF();
1345         LED_C_OFF();
1346
1347         if(buttonPressed)
1348         {
1349                 DbpString("Button pressed");
1350         }
1351         return buttonPressed;
1352 }
1353
1354 static int SendIClassAnswer(uint8_t *resp, int respLen, int delay)
1355 {
1356         int i = 0, d=0;//, u = 0, d = 0;
1357         uint8_t b = 0;
1358
1359         //FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
1360         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K_8BIT);
1361
1362         AT91C_BASE_SSC->SSC_THR = 0x00;
1363         FpgaSetupSsc();
1364         while(!BUTTON_PRESS()) {
1365                 if((AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)){
1366                         b = AT91C_BASE_SSC->SSC_RHR; (void) b;
1367                 }
1368                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)){
1369                         b = 0x00;
1370                         if(d < delay) {
1371                                 d++;
1372                         }
1373                         else {
1374                                 if( i < respLen){
1375                                         b = resp[i];
1376                                         //Hack
1377                                         //b = 0xAC;
1378                                 }
1379                                 i++;
1380                         }
1381                         AT91C_BASE_SSC->SSC_THR = b;
1382                 }
1383
1384 //              if (i > respLen +4) break;
1385                 if (i > respLen +1) break;
1386         }
1387
1388         return 0;
1389 }
1390
1391 /// THE READER CODE
1392
1393 //-----------------------------------------------------------------------------
1394 // Transmit the command (to the tag) that was placed in ToSend[].
1395 //-----------------------------------------------------------------------------
1396 static void TransmitIClassCommand(const uint8_t *cmd, int len, int *samples, int *wait)
1397 {
1398   int c;
1399   FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1400   AT91C_BASE_SSC->SSC_THR = 0x00;
1401   FpgaSetupSsc();
1402
1403    if (wait)
1404    {
1405      if(*wait < 10) *wait = 10;
1406
1407      for(c = 0; c < *wait;) {
1408        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1409          AT91C_BASE_SSC->SSC_THR = 0x00;                // For exact timing!
1410          c++;
1411        }
1412        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1413          volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
1414          (void)r;
1415        }
1416        WDT_HIT();
1417      }
1418
1419    }
1420
1421
1422   uint8_t sendbyte;
1423   bool firstpart = TRUE;
1424   c = 0;
1425   for(;;) {
1426     if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1427
1428       // DOUBLE THE SAMPLES!
1429       if(firstpart) {
1430         sendbyte = (cmd[c] & 0xf0) | (cmd[c] >> 4);
1431       }
1432       else {
1433         sendbyte = (cmd[c] & 0x0f) | (cmd[c] << 4);
1434         c++;
1435       }
1436       if(sendbyte == 0xff) {
1437         sendbyte = 0xfe;
1438       }
1439       AT91C_BASE_SSC->SSC_THR = sendbyte;
1440       firstpart = !firstpart;
1441
1442       if(c >= len) {
1443         break;
1444       }
1445     }
1446     if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1447       volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
1448       (void)r;
1449     }
1450     WDT_HIT();
1451   }
1452   if (samples) *samples = (c + *wait) << 3;
1453 }
1454
1455
1456 //-----------------------------------------------------------------------------
1457 // Prepare iClass reader command to send to FPGA
1458 //-----------------------------------------------------------------------------
1459 void CodeIClassCommand(const uint8_t * cmd, int len)
1460 {
1461   int i, j, k;
1462   uint8_t b;
1463
1464   ToSendReset();
1465
1466   // Start of Communication: 1 out of 4
1467   ToSend[++ToSendMax] = 0xf0;
1468   ToSend[++ToSendMax] = 0x00;
1469   ToSend[++ToSendMax] = 0x0f;
1470   ToSend[++ToSendMax] = 0x00;
1471
1472   // Modulate the bytes
1473   for (i = 0; i < len; i++) {
1474     b = cmd[i];
1475     for(j = 0; j < 4; j++) {
1476       for(k = 0; k < 4; k++) {
1477                         if(k == (b & 3)) {
1478                                 ToSend[++ToSendMax] = 0x0f;
1479                         }
1480                         else {
1481                                 ToSend[++ToSendMax] = 0x00;
1482                         }
1483       }
1484       b >>= 2;
1485     }
1486   }
1487
1488   // End of Communication
1489   ToSend[++ToSendMax] = 0x00;
1490   ToSend[++ToSendMax] = 0x00;
1491   ToSend[++ToSendMax] = 0xf0;
1492   ToSend[++ToSendMax] = 0x00;
1493
1494   // Convert from last character reference to length
1495   ToSendMax++;
1496 }
1497
1498 void ReaderTransmitIClass(uint8_t* frame, int len)
1499 {
1500         int wait = 0;
1501         int samples = 0;
1502
1503         // This is tied to other size changes
1504         CodeIClassCommand(frame,len);
1505
1506         // Select the card
1507         TransmitIClassCommand(ToSend, ToSendMax, &samples, &wait);
1508         if(trigger)
1509                 LED_A_ON();
1510
1511         // Store reader command in buffer
1512         if (tracing) {
1513                 uint8_t par[MAX_PARITY_SIZE];
1514                 GetParity(frame, len, par);
1515                 LogTrace(frame, len, rsamples, rsamples, par, TRUE);
1516         }
1517 }
1518
1519 //-----------------------------------------------------------------------------
1520 // Wait a certain time for tag response
1521 //  If a response is captured return TRUE
1522 //  If it takes too long return FALSE
1523 //-----------------------------------------------------------------------------
1524 static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) //uint8_t *buffer
1525 {
1526         // buffer needs to be 512 bytes
1527         int c;
1528
1529         // Set FPGA mode to "reader listen mode", no modulation (listen
1530         // only, since we are receiving, not transmitting).
1531         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN);
1532
1533         // Now get the answer from the card
1534         Demod.output = receivedResponse;
1535         Demod.len = 0;
1536         Demod.state = DEMOD_UNSYNCD;
1537
1538         uint8_t b;
1539         if (elapsed) *elapsed = 0;
1540
1541         bool skip = FALSE;
1542
1543         c = 0;
1544         for(;;) {
1545                 WDT_HIT();
1546
1547                 if(BUTTON_PRESS()) return FALSE;
1548
1549                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1550                         AT91C_BASE_SSC->SSC_THR = 0x00;  // To make use of exact timing of next command from reader!!
1551                         if (elapsed) (*elapsed)++;
1552                 }
1553                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1554                         if(c < timeout) { c++; } else { return FALSE; }
1555                         b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
1556                         skip = !skip;
1557                         if(skip) continue;
1558
1559                         if(ManchesterDecoding(b & 0x0f)) {
1560                                 *samples = c << 3;
1561                                 return  TRUE;
1562                         }
1563                 }
1564         }
1565 }
1566
1567 int ReaderReceiveIClass(uint8_t* receivedAnswer)
1568 {
1569   int samples = 0;
1570   if (!GetIClassAnswer(receivedAnswer,160,&samples,0)) return FALSE;
1571   rsamples += samples;
1572   if (tracing) {
1573         uint8_t parity[MAX_PARITY_SIZE];
1574         GetParity(receivedAnswer, Demod.len, parity);
1575         LogTrace(receivedAnswer,Demod.len,rsamples,rsamples,parity,FALSE);
1576   }
1577   if(samples == 0) return FALSE;
1578   return Demod.len;
1579 }
1580
1581 void setupIclassReader()
1582 {
1583     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
1584     // Reset trace buffer
1585         set_tracing(TRUE);
1586         clear_trace();
1587
1588     // Setup SSC
1589     FpgaSetupSsc();
1590     // Start from off (no field generated)
1591     // Signal field is off with the appropriate LED
1592     LED_D_OFF();
1593     FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1594     SpinDelay(200);
1595
1596     SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1597
1598     // Now give it time to spin up.
1599     // Signal field is on with the appropriate LED
1600     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1601     SpinDelay(200);
1602     LED_A_ON();
1603
1604 }
1605
1606 size_t sendCmdGetResponseWithRetries(uint8_t* command, size_t cmdsize, uint8_t* resp, uint8_t expected_size, uint8_t retries)
1607 {
1608         while(retries-- > 0)
1609         {
1610                 ReaderTransmitIClass(command, cmdsize);
1611                 if(expected_size == ReaderReceiveIClass(resp)){
1612                         return 0;
1613                 }
1614         }
1615         return 1;//Error
1616 }
1617
1618 /**
1619  * @brief Talks to an iclass tag, sends the commands to get CSN and CC.
1620  * @param card_data where the CSN and CC are stored for return
1621  * @return 0 = fail
1622  *         1 = Got CSN
1623  *         2 = Got CSN and CC
1624  */
1625 uint8_t handshakeIclassTag(uint8_t *card_data)
1626 {
1627         static uint8_t act_all[]     = { 0x0a };
1628         static uint8_t identify[]    = { 0x0c };
1629         static uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1630
1631
1632         static uint8_t readcheck_cc[]= { 0x88, 0x02,};
1633
1634         uint8_t resp[ICLASS_BUFFER_SIZE];
1635
1636         uint8_t read_status = 0;
1637
1638         // Send act_all
1639         ReaderTransmitIClass(act_all, 1);
1640         // Card present?
1641         if(!ReaderReceiveIClass(resp)) return read_status;//Fail
1642         //Send Identify
1643         ReaderTransmitIClass(identify, 1);
1644         //We expect a 10-byte response here, 8 byte anticollision-CSN and 2 byte CRC
1645         uint8_t len  = ReaderReceiveIClass(resp);
1646         if(len != 10) return read_status;//Fail
1647
1648         //Copy the Anti-collision CSN to our select-packet
1649         memcpy(&select[1],resp,8);
1650         //Select the card
1651         ReaderTransmitIClass(select, sizeof(select));
1652         //We expect a 10-byte response here, 8 byte CSN and 2 byte CRC
1653         len  = ReaderReceiveIClass(resp);
1654         if(len != 10) return read_status;//Fail
1655
1656         //Success - level 1, we got CSN
1657         //Save CSN in response data
1658         memcpy(card_data,resp,8);
1659
1660         //Flag that we got to at least stage 1, read CSN
1661         read_status = 1;
1662
1663         // Card selected, now read e-purse (cc)
1664         ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
1665         if(ReaderReceiveIClass(resp) == 8) {
1666                 //Save CC (e-purse) in response data
1667                 memcpy(card_data+8,resp,8);
1668                 read_status++;
1669         }
1670
1671         return read_status;
1672 }
1673
1674
1675 // Reader iClass Anticollission
1676 void ReaderIClass(uint8_t arg0) {
1677
1678         uint8_t card_data[6 * 8]={0xFF};
1679     uint8_t last_csn[8]={0};
1680
1681         //Read conf block CRC(0x01) => 0xfa 0x22
1682         uint8_t readConf[] = { ICLASS_CMD_READ_OR_IDENTIFY,0x01, 0xfa, 0x22};
1683         //Read conf block CRC(0x05) => 0xde  0x64
1684         uint8_t readAA[] = { ICLASS_CMD_READ_OR_IDENTIFY,0x05, 0xde, 0x64};
1685
1686
1687     int read_status= 0;
1688         uint8_t result_status = 0;
1689     bool abort_after_read = arg0 & FLAG_ICLASS_READER_ONLY_ONCE;
1690
1691         set_tracing(TRUE);
1692     setupIclassReader();
1693
1694         while(!BUTTON_PRESS())
1695     {
1696
1697                 if(!tracing) {
1698                         DbpString("Trace full");
1699                         break;
1700                 }
1701                 WDT_HIT();
1702
1703                 read_status = handshakeIclassTag(card_data);
1704
1705                 if(read_status == 0) continue;
1706                 if(read_status == 1) result_status = FLAG_ICLASS_READER_CSN;
1707                 if(read_status == 2) result_status = FLAG_ICLASS_READER_CSN|FLAG_ICLASS_READER_CC;
1708
1709                 // handshakeIclass returns CSN|CC, but the actual block
1710                 // layout is CSN|CONFIG|CC, so here we reorder the data,
1711                 // moving CC forward 8 bytes
1712                 memcpy(card_data+16,card_data+8, 8);
1713                 //Read block 1, config
1714                 if(arg0 & FLAG_ICLASS_READER_CONF)
1715                 {
1716                         if(sendCmdGetResponseWithRetries(readConf, sizeof(readConf),card_data+8, 10, 10))
1717                         {
1718                                 Dbprintf("Failed to dump config block");
1719                         }else
1720                         {
1721                                 result_status |= FLAG_ICLASS_READER_CONF;
1722                         }
1723                 }
1724
1725                 //Read block 5, AA
1726                 if(arg0 & FLAG_ICLASS_READER_AA){
1727                         if(sendCmdGetResponseWithRetries(readAA, sizeof(readAA),card_data+(8*4), 10, 10))
1728                         {
1729 //                              Dbprintf("Failed to dump AA block");
1730                         }else
1731                         {
1732                                 result_status |= FLAG_ICLASS_READER_AA;
1733                         }
1734                 }
1735
1736                 // 0 : CSN
1737                 // 1 : Configuration
1738                 // 2 : e-purse
1739                 // (3,4 write-only, kc and kd)
1740                 // 5 Application issuer area
1741                 //
1742                 //Then we can 'ship' back the 8 * 5 bytes of data,
1743                 // with 0xFF:s in block 3 and 4.
1744
1745                 LED_B_ON();
1746                 //Send back to client, but don't bother if we already sent this
1747                 if(memcmp(last_csn, card_data, 8) != 0)
1748                 {
1749                         // If caller requires that we get CC, continue until we got it
1750                         if( (arg0 & read_status & FLAG_ICLASS_READER_CC) || !(arg0 & FLAG_ICLASS_READER_CC))
1751                         {
1752                                 cmd_send(CMD_ACK,result_status,0,0,card_data,sizeof(card_data));
1753                                 if(abort_after_read) {
1754                                         LED_A_OFF();
1755                                         return;
1756                                 }
1757                                 //Save that we already sent this....
1758                                 memcpy(last_csn, card_data, 8);
1759                         }
1760
1761                 }
1762                 LED_B_OFF();
1763     }
1764     cmd_send(CMD_ACK,0,0,0,card_data, 0);
1765     LED_A_OFF();
1766 }
1767
1768 void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
1769
1770         uint8_t card_data[USB_CMD_DATA_SIZE]={0};
1771         uint16_t block_crc_LUT[255] = {0};
1772
1773         {//Generate a lookup table for block crc
1774                 for(int block = 0; block < 255; block++){
1775                         char bl = block;
1776                         block_crc_LUT[block] = iclass_crc16(&bl ,1);
1777                 }
1778         }
1779         //Dbprintf("Lookup table: %02x %02x %02x" ,block_crc_LUT[0],block_crc_LUT[1],block_crc_LUT[2]);
1780
1781         uint8_t check[]       = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1782         uint8_t read[]        = { 0x0c, 0x00, 0x00, 0x00 };
1783
1784     uint16_t crc = 0;
1785         uint8_t cardsize=0;
1786         uint8_t mem=0;
1787
1788         static struct memory_t{
1789           int k16;
1790           int book;
1791           int k2;
1792           int lockauth;
1793           int keyaccess;
1794         } memory;
1795
1796         uint8_t resp[ICLASS_BUFFER_SIZE];
1797
1798     setupIclassReader();
1799         set_tracing(TRUE);
1800
1801         while(!BUTTON_PRESS()) {
1802
1803                 WDT_HIT();
1804
1805                 if(!tracing) {
1806                         DbpString("Trace full");
1807                         break;
1808                 }
1809
1810                 uint8_t read_status = handshakeIclassTag(card_data);
1811                 if(read_status < 2) continue;
1812
1813                 //for now replay captured auth (as cc not updated)
1814                 memcpy(check+5,MAC,4);
1815
1816                 if(sendCmdGetResponseWithRetries(check, sizeof(check),resp, 4, 5))
1817                 {
1818                         Dbprintf("Error: Authentication Fail!");
1819                         continue;
1820                 }
1821
1822                 //first get configuration block (block 1)
1823                 crc = block_crc_LUT[1];
1824                 read[1]=1;
1825                 read[2] = crc >> 8;
1826                 read[3] = crc & 0xff;
1827
1828                 if(sendCmdGetResponseWithRetries(read, sizeof(read),resp, 10, 10))
1829                 {
1830                         Dbprintf("Dump config (block 1) failed");
1831                         continue;
1832                 }
1833
1834                 mem=resp[5];
1835                 memory.k16= (mem & 0x80);
1836                 memory.book= (mem & 0x20);
1837                 memory.k2= (mem & 0x8);
1838                 memory.lockauth= (mem & 0x2);
1839                 memory.keyaccess= (mem & 0x1);
1840
1841                 cardsize = memory.k16 ? 255 : 32;
1842                 WDT_HIT();
1843                 //Set card_data to all zeroes, we'll fill it with data
1844                 memset(card_data,0x0,USB_CMD_DATA_SIZE);
1845                 uint8_t failedRead =0;
1846                 uint32_t stored_data_length =0;
1847                 //then loop around remaining blocks
1848                 for(int block=0; block < cardsize; block++){
1849
1850                         read[1]= block;
1851                         crc = block_crc_LUT[block];
1852                         read[2] = crc >> 8;
1853                         read[3] = crc & 0xff;
1854
1855                         if(!sendCmdGetResponseWithRetries(read, sizeof(read), resp, 10, 10))
1856                         {
1857                                 Dbprintf("     %02x: %02x %02x %02x %02x %02x %02x %02x %02x",
1858                                                  block, resp[0], resp[1], resp[2],
1859                                                 resp[3], resp[4], resp[5],
1860                                                 resp[6], resp[7]);
1861
1862                                 //Fill up the buffer
1863                                 memcpy(card_data+stored_data_length,resp,8);
1864                                 stored_data_length += 8;
1865                                 if(stored_data_length +8 > USB_CMD_DATA_SIZE)
1866                                 {//Time to send this off and start afresh
1867                                         cmd_send(CMD_ACK,
1868                                                          stored_data_length,//data length
1869                                                          failedRead,//Failed blocks?
1870                                                          0,//Not used ATM
1871                                                          card_data, stored_data_length);
1872                                         //reset
1873                                         stored_data_length = 0;
1874                                         failedRead = 0;
1875                                 }
1876
1877                         }else{
1878                                 failedRead = 1;
1879                                 stored_data_length +=8;//Otherwise, data becomes misaligned
1880                                 Dbprintf("Failed to dump block %d", block);
1881                         }
1882                 }
1883
1884                 //Send off any remaining data
1885                 if(stored_data_length > 0)
1886                 {
1887                         cmd_send(CMD_ACK,
1888                                          stored_data_length,//data length
1889                                          failedRead,//Failed blocks?
1890                                          0,//Not used ATM
1891                                          card_data, stored_data_length);
1892                 }
1893                 //If we got here, let's break
1894                 break;
1895         }
1896         //Signal end of transmission
1897         cmd_send(CMD_ACK,
1898                          0,//data length
1899                          0,//Failed blocks?
1900                          0,//Not used ATM
1901                          card_data, 0);
1902
1903         LED_A_OFF();
1904 }
1905
1906 //2. Create Read method (cut-down from above) based off responses from 1.
1907 //   Since we have the MAC could continue to use replay function.
1908 //3. Create Write method
1909 /*
1910 void IClass_iso14443A_write(uint8_t arg0, uint8_t blockNo, uint8_t *data, uint8_t *MAC) {
1911         uint8_t act_all[]     = { 0x0a };
1912         uint8_t identify[]    = { 0x0c };
1913         uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1914         uint8_t readcheck_cc[]= { 0x88, 0x02 };
1915         uint8_t check[]       = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1916         uint8_t read[]        = { 0x0c, 0x00, 0x00, 0x00 };
1917         uint8_t write[]       = { 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
1918
1919     uint16_t crc = 0;
1920
1921         uint8_t* resp = (((uint8_t *)BigBuf) + 3560);
1922
1923         // Reset trace buffer
1924     memset(trace, 0x44, RECV_CMD_OFFSET);
1925         traceLen = 0;
1926
1927         // Setup SSC
1928         FpgaSetupSsc();
1929         // Start from off (no field generated)
1930         // Signal field is off with the appropriate LED
1931         LED_D_OFF();
1932         FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1933         SpinDelay(200);
1934
1935         SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1936
1937         // Now give it time to spin up.
1938         // Signal field is on with the appropriate LED
1939         FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1940         SpinDelay(200);
1941
1942         LED_A_ON();
1943
1944         for(int i=0;i<1;i++) {
1945
1946                 if(traceLen > TRACE_SIZE) {
1947                         DbpString("Trace full");
1948                         break;
1949                 }
1950
1951                 if (BUTTON_PRESS()) break;
1952
1953                 // Send act_all
1954                 ReaderTransmitIClass(act_all, 1);
1955                 // Card present?
1956                 if(ReaderReceiveIClass(resp)) {
1957                         ReaderTransmitIClass(identify, 1);
1958                         if(ReaderReceiveIClass(resp) == 10) {
1959                                 // Select card
1960                                 memcpy(&select[1],resp,8);
1961                                 ReaderTransmitIClass(select, sizeof(select));
1962
1963                                 if(ReaderReceiveIClass(resp) == 10) {
1964                                         Dbprintf("     Selected CSN: %02x %02x %02x %02x %02x %02x %02x %02x",
1965                                         resp[0], resp[1], resp[2],
1966                                         resp[3], resp[4], resp[5],
1967                                         resp[6], resp[7]);
1968                                 }
1969                                 // Card selected
1970                                 Dbprintf("Readcheck on Sector 2");
1971                                 ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));
1972                                 if(ReaderReceiveIClass(resp) == 8) {
1973                                    Dbprintf("     CC: %02x %02x %02x %02x %02x %02x %02x %02x",
1974                                         resp[0], resp[1], resp[2],
1975                                         resp[3], resp[4], resp[5],
1976                                         resp[6], resp[7]);
1977                                 }else return;
1978                                 Dbprintf("Authenticate");
1979                                 //for now replay captured auth (as cc not updated)
1980                                 memcpy(check+5,MAC,4);
1981                                 Dbprintf("     AA: %02x %02x %02x %02x",
1982                                         check[5], check[6], check[7],check[8]);
1983                                 ReaderTransmitIClass(check, sizeof(check));
1984                                 if(ReaderReceiveIClass(resp) == 4) {
1985                                    Dbprintf("     AR: %02x %02x %02x %02x",
1986                                         resp[0], resp[1], resp[2],resp[3]);
1987                                 }else {
1988                                   Dbprintf("Error: Authentication Fail!");
1989                                   return;
1990                                 }
1991                                 Dbprintf("Write Block");
1992
1993                                 //read configuration for max block number
1994                                 read_success=false;
1995                                 read[1]=1;
1996                                 uint8_t *blockno=&read[1];
1997                                 crc = iclass_crc16((char *)blockno,1);
1998                                 read[2] = crc >> 8;
1999                                 read[3] = crc & 0xff;
2000                                 while(!read_success){
2001                                       ReaderTransmitIClass(read, sizeof(read));
2002                                       if(ReaderReceiveIClass(resp) == 10) {
2003                                          read_success=true;
2004                                          mem=resp[5];
2005                                          memory.k16= (mem & 0x80);
2006                                          memory.book= (mem & 0x20);
2007                                          memory.k2= (mem & 0x8);
2008                                          memory.lockauth= (mem & 0x2);
2009                                          memory.keyaccess= (mem & 0x1);
2010
2011                                       }
2012                                 }
2013                                 if (memory.k16){
2014                                   cardsize=255;
2015                                 }else cardsize=32;
2016                                 //check card_size
2017
2018                                 memcpy(write+1,blockNo,1);
2019                                 memcpy(write+2,data,8);
2020                                 memcpy(write+10,mac,4);
2021                                 while(!send_success){
2022                                   ReaderTransmitIClass(write, sizeof(write));
2023                                   if(ReaderReceiveIClass(resp) == 10) {
2024                                     write_success=true;
2025                                 }
2026                         }//
2027                 }
2028                 WDT_HIT();
2029         }
2030
2031         LED_A_OFF();
2032 }*/