git.zerfleddert.de Git - proxmark3-svn/blob

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 //-----------------------------------------------------------------------------

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"

53 static int timeout = 4096;

 static int SendIClassAnswer(uint8_t *resp, int respLen, int delay);

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;

 static RAMFUNC int OutOfNDecoding(int bit)

86 {

87 //int error = 0;

88 int bitright;

90 if(!Uart.bitBuffer) {

                 Uart.bitBuffer = bit ^ 0xFF0;

92 return FALSE;

93 }

94 else {

95 Uart.bitBuffer <<= 4;

96 Uart.bitBuffer ^= bit;

97 }

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

         if(Uart.state != STATE_UNSYNCD) {

110 Uart.posCnt++;

111

                 if((Uart.bitBuffer & Uart.syncBit) ^ Uart.syncBit) {

113 bit = 0x00;

114 }

115 else {

116 bit = 0x01;

117 }

                 if(((Uart.bitBuffer << 1) & Uart.syncBit) ^ Uart.syncBit) {

119 bitright = 0x00;

120 }

121 else {

122 bitright = 0x01;

123 }

                 if(bit != bitright) { bit = bitright; }

125

126

127 // So, now we only have to deal with *bit*, lets see...

                 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

                                 if(Uart.nOutOfCnt == 1) {

135 // End of Communication

136 Uart.state = STATE_UNSYNCD;

137 Uart.highCnt = 0;

                                         if(Uart.byteCnt == 0) {

139 // Its not straightforward to show single EOFs

140 // So just leave it and do not return TRUE

                                                 Uart.output[0] = 0xf0;

142 Uart.byteCnt++;

143 }

144 else {

145 return TRUE;

146 }

147 }

                                 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) {

                                         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

                         if(Uart.nOutOfCnt == Uart.OutOfCnt && Uart.OutOfCnt == 4) {

182 Uart.nOutOfCnt = 0;

183

                                 if(Uart.state == STATE_START_OF_COMMUNICATION) {

                                         if(Uart.dropPosition == 4) {

186 Uart.state = STATE_RECEIVING;

187 Uart.OutOfCnt = 256;

188 }

                                         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

                                                 Uart.shiftReg ^= ((Uart.dropPosition & 0x03) << 6);

218 Uart.bitCnt += 2;

219 Uart.dropPosition = 0;

220

                                                 if(Uart.bitCnt == 8) {

                                                         Uart.output[Uart.byteCnt] = (Uart.shiftReg & 0xff);

223 Uart.byteCnt++;

224 Uart.bitCnt = 0;

225 Uart.shiftReg = 0;

226 }

227 }

228 }

229 }

                         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--;

                                         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 {

                 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

                         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

                                 Uart.posCnt = 1;   // apparently we are busy with our first half bit period

                                 Uart.syncBit = bit & 8;

282 Uart.samples = 3;

                                 if(!Uart.syncBit)       { Uart.syncBit = bit & 4; Uart.samples = 2; }

                                 else if(bit & 4)        { Uart.syncBit = bit & 4; Uart.samples = 2; bit <<= 2; }

                                 if(!Uart.syncBit)       { Uart.syncBit = bit & 2; Uart.samples = 1; }

                                 else if(bit & 2)        { Uart.syncBit = bit & 2; Uart.samples = 1; bit <<= 1; }

                                 if(!Uart.syncBit)       { Uart.syncBit = bit & 1; Uart.samples = 0;

                                         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 }

                                 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;

                                 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 {

                         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

 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

         if(Demod.buff < 3) {

371 Demod.buff++;

372 return FALSE;

373 }

374

         if(Demod.state==DEMOD_UNSYNCD) {

                 Demod.output[Demod.len] = 0xfa;

377 Demod.syncBit = 0;

378 //Demod.samples = 0;

                 Demod.posCount = 1;             // This is the first half bit period, so after syncing handle the second part

380

                 if(bit & 0x08) {

382 Demod.syncBit = 0x08;

383 }

384

                 if(bit & 0x04) {

386 if(Demod.syncBit) {

387 bit <<= 4;

388 }

389 Demod.syncBit = 0x04;

390 }

391

                 if(bit & 0x02) {

393 if(Demod.syncBit) {

394 bit <<= 2;

395 }

396 Demod.syncBit = 0x02;

397 }

398

                 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) {

                                         case 0x08: Demod.samples = 3; break;

                                         case 0x04: Demod.samples = 2; break;

                                         case 0x02: Demod.samples = 1; break;

                                         case 0x01: Demod.samples = 0; break;

417 }

418 // SOF must be long burst... otherwise stay unsynced!!!

                                 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!!!

                                 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;

                 modulation |= ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;

438

439 Demod.samples += 4;

440

                 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) {

                                 if(Demod.sub == SUB_FIRST_HALF) {

462 Demod.sub = SUB_BOTH;

463 }

464 else {

465 Demod.sub = SUB_SECOND_HALF;

466 }

467 }

                         else if(Demod.sub == SUB_NONE) {

                                 if(Demod.state == DEMOD_SOF_COMPLETE) {

                                         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:

                                         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 {

                                                 Demod.output[Demod.len] = 0xab;

497 Demod.state = DEMOD_ERROR_WAIT;

498 error = 0xd2;

499 }

500 break;

501 case DEMOD_START_OF_COMMUNICATION2:

                                         if(Demod.sub == SUB_SECOND_HALF) {

503 Demod.state = DEMOD_START_OF_COMMUNICATION3;

504 }

505 else {

                                                 Demod.output[Demod.len] = 0xab;

507 Demod.state = DEMOD_ERROR_WAIT;

508 error = 0xd3;

509 }

510 break;

511 case DEMOD_START_OF_COMMUNICATION3:

                                         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 {

                                                 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)

                                         if(Demod.sub == SUB_SECOND_HALF) { // SUB_FIRST_HALF

530 Demod.bitCount++;

                                                 Demod.shiftReg = (Demod.shiftReg >> 1) ^ 0x100;

532 Demod.state = DEMOD_MANCHESTER_D;

533 }

                                         else if(Demod.sub == SUB_FIRST_HALF) { // SUB_SECOND_HALF

535 Demod.bitCount++;

536 Demod.shiftReg >>= 1;

537 Demod.state = DEMOD_MANCHESTER_E;

538 }

                                         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!

                                         if(Demod.len > 0 || Demod.bitCount > 0) {

                                                 if(Demod.bitCount > 1) {  // was > 0, do not interpret last closing bit, is part of EOF

                                                         Demod.shiftReg >>= (9 - Demod.bitCount);        // right align data

                                                         Demod.output[Demod.len] = Demod.shiftReg & 0xff;

554 Demod.len++;

555 }

556

557 Demod.state = DEMOD_UNSYNCD;

558 return TRUE;

559 }

560 else {

                                                 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:

                                         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 }*/

                         if(Demod.bitCount>=8) {

588 Demod.shiftReg >>= 1;

                                 Demod.output[Demod.len] = (Demod.shiftReg & 0xff);

590 Demod.len++;

591 Demod.bitCount = 0;

592 Demod.shiftReg = 0;

593 }

594

595 if(error) {

                                 Demod.output[Demod.len] = 0xBB;

597 Demod.len++;

                                 Demod.output[Demod.len] = error & 0xFF;

599 Demod.len++;

                                 Demod.output[Demod.len] = 0xBB;

601 Demod.len++;

                                 Demod.output[Demod.len] = bit & 0xFF;

603 Demod.len++;

                                 Demod.output[Demod.len] = Demod.buffer & 0xFF;

605 Demod.len++;

606 // Look harder ;-)

                                 Demod.output[Demod.len] = Demod.buffer2 & 0xFF;

608 Demod.len++;

                                 Demod.output[Demod.len] = Demod.syncBit & 0xFF;

610 Demod.len++;

                                 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 //-----------------------------------------------------------------------------

 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

     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;

     FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);

681

682 // And the reader -> tag commands

     memset(&Uart, 0, sizeof(Uart));

684 Uart.output = readerToTagCmd;

     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();

         int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &

708 (DMA_BUFFER_SIZE-1);

709 if(behindBy > maxBehindBy) {

710 maxBehindBy = behindBy;

             if(behindBy > (9 * DMA_BUFFER_SIZE / 10)) {

                 Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);

713 goto done;

714 }

715 }

         if(behindBy < 1) continue;

717

718 LED_A_OFF();

719 smpl = upTo[0];

720 upTo++;

721 lastRxCounter -= 1;

         if(upTo - dmaBuf > DMA_BUFFER_SIZE) {

723 upTo -= DMA_BUFFER_SIZE;

724 lastRxCounter += DMA_BUFFER_SIZE;

             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

         if(smpl & 0xF) {

                 decbyte ^= (1 << (3 - div));

734 }

735

736 // FOR READER SIDE COMMUMICATION...

737

738 decbyter <<= 2;

739 decbyter ^= (smpl & 0x30);

740

741 div++;

742

         if((div + 1) % 2 == 0) {

744 smpl = decbyter;

                 if(OutOfNDecoding((smpl & 0xF0) >> 4)) {

746 rsamples = samples - Uart.samples;

                         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];

                                 GetParity(Uart.output, Uart.byteCnt, parity);

                                 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{

                         time_start = (GetCountSspClk()-time_0) << 4;

768 }

769 decbyter = 0;

770 }

771

         if(div > 3) {

773 smpl = decbyte;

                 if(ManchesterDecoding(smpl & 0x0F)) {

                         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];

                                 GetParity(Demod.output, Demod.len, parity);

                                 LogTrace(Demod.output, Demod.len, time_start, time_stop, parity, FALSE);

784 }

785

786 // And ready to receive another response.

                     memset(&Demod, 0, sizeof(Demod));

788 Demod.output = tagToReaderResponse;

789 Demod.state = DEMOD_UNSYNCD;

790 LED_C_OFF();

791 }else{

                         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

     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);

         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;

     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);

         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

 void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {

822 int i;

         for(i = 0; i < 8; i++) {

                 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 //-----------------------------------------------------------------------------

 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

         if(BUTTON_PRESS()) return FALSE;

850

         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {

852 AT91C_BASE_SSC->SSC_THR = 0x00;

853 }

         if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {

             uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;

856

                         if(OutOfNDecoding(b & 0x0f)) {

858 *len = Uart.byteCnt;

859 return TRUE;

860 }

861 }

862 }

863 }

864

 static uint8_t encode4Bits(const uint8_t b)

866 {

         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

           case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55

           case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95

           case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65

           case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5

           case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59

           case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99

           case 9:  return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69

           case 8:  return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9

           case 7:  return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56

           case 6:  return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96

           case 5:  return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66

           case 4:  return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6

           case 3:  return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a

           case 2:  return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a

           case 1:  return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a

           default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa

893

894 }

895 }

896

897 //-----------------------------------------------------------------------------

898 // Prepare tag messages

899 //-----------------------------------------------------------------------------

 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

         for(i = 0; i < len; i++) {

944 uint8_t b = cmd[i];

                 ToSend[++ToSendMax] = encode4Bits(b & 0xF); //Least significant half

                 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

 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 */

 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

         uint8_t *emulator = BigBuf_get_EM_addr();

998

         if(simType == 0) {

1000 // Use the CSN from commandline

                 memcpy(emulator, datain, 8);

1002 doIClassSimulation(MODE_SIM_CSN,NULL);

         }else if(simType == 1)

1004 {

1005 //Default CSN

                 uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };

1007 // Use the CSN from commandline

                 memcpy(emulator, csn_crc, 8);

1009 doIClassSimulation(MODE_SIM_CSN,NULL);

1010 }

         else if(simType == 2)

1012 {

1013

                 uint8_t mac_responses[USB_CMD_DATA_SIZE] = { 0 };

                 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;

                 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

                         memcpy(emulator, datain+(i*8), 8);

                         if(doIClassSimulation(MODE_EXIT_AFTER_MAC,mac_responses+i*8))

1026 {

                                 cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);

1028 return; // Button pressed

1029 }

1030 }

                 cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);

1032

         }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 }

 void AppendCrc(uint8_t* data, int len)

1046 {

         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 */

 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;

         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

         uint8_t anticoll_data[10] = { 0 };

         uint8_t csn_data[10] = { 0 };

         memcpy(csn_data,csn,sizeof(csn_data));

         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

         ComputeCrc14443(CRC_ICLASS, anticoll_data, 8, &anticoll_data[8], &anticoll_data[9]);

         ComputeCrc14443(CRC_ICLASS, csn_data, 8, &csn_data[8], &csn_data[9]);

1077

         uint8_t diversified_key[8] = { 0 };

1079 // e-Purse

         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

                 memcpy(diversified_key, emulator+(8*3),8);

1086

1087 //Card challenge, a.k.a e-purse is on block 2

                 memcpy(card_challenge_data,emulator + (8 * 2) , 8);

1089 //Precalculate the cipher state, feeding it the CC

                 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

         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)

         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)

         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)

         uint8_t *resp_cc = BigBuf_malloc(20);

1125 int resp_cc_len;

1126

         uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);

         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();

         memcpy(resp_sof, ToSend, ToSendMax); resp_sof_Len = ToSendMax;

1137

1138 // Anticollision CSN

         CodeIClassTagAnswer(anticoll_data, sizeof(anticoll_data));

         memcpy(resp_anticoll, ToSend, ToSendMax); resp_anticoll_len = ToSendMax;

1141

1142 // CSN

         CodeIClassTagAnswer(csn_data, sizeof(csn_data));

         memcpy(resp_csn, ToSend, ToSendMax); resp_csn_len = ToSendMax;

1145

1146 // e-Purse

         CodeIClassTagAnswer(card_challenge_data, sizeof(card_challenge_data));

         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

         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)

         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

                 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.

                 if(receivedCmd[0] == ICLASS_CMD_ACTALL ) {

1193 // Reader in anticollission phase

                         modulated_response = resp_sof; modulated_response_size = resp_sof_Len; //order = 1;

1195 trace_data = sof_data;

1196 trace_data_size = sizeof(sof_data);

                 } else if(receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 1) {

1198 // Reader asks for anticollission CSN

                         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:");

                 } else if(receivedCmd[0] == ICLASS_CMD_SELECT) {

1204 // Reader selects anticollission CSN.

1205 // Tag sends the corresponding real CSN

                         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:");

                 } else if(receivedCmd[0] == ICLASS_CMD_READCHECK_KD) {

1211 // Read e-purse (88 02)

                         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();

                 } 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

                                 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);

                                 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

                                 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"

                                                            ,csn[0],csn[1],csn[2],csn[3],csn[4],csn[5],csn[6],csn[7]);

                                         Dbprintf("RDR:  (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",len,

                                                         receivedCmd[0], receivedCmd[1], receivedCmd[2],

                                                         receivedCmd[3], receivedCmd[4], receivedCmd[5],

                                                         receivedCmd[6], receivedCmd[7], receivedCmd[8]);

1245 if (reader_mac_buf != NULL)

1246 {

                                                 memcpy(reader_mac_buf,receivedCmd+1,8);

1248 }

1249 exitLoop = true;

1250 }

1251 }

1252

                 } else if(receivedCmd[0] == ICLASS_CMD_HALT && len == 1) {

1254 // Reader ends the session

                         modulated_response = resp_sof; modulated_response_size = 0; //order = 0;

1256 trace_data = NULL;

1257 trace_data_size = 0;

                 } else if(simulationMode == MODE_FULLSIM && receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 4){

1259 //Read block

                         uint16_t blk = receivedCmd[1];

1261 //Take the data...

                         memcpy(data_generic_trace, emulator+(blk << 3),8);

1263 //Add crc

                         AppendCrc(data_generic_trace, 8);

1265 trace_data = data_generic_trace;

1266 trace_data_size = 10;

1267 CodeIClassTagAnswer(trace_data , trace_data_size);

                         memcpy(data_response, ToSend, ToSendMax);

1269 modulated_response = data_response;

1270 modulated_response_size = ToSendMax;

                 }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...

                         memcpy(data_generic_trace, receivedCmd+2,8);

1279 //Add crc

                         AppendCrc(data_generic_trace, 8);

1281 trace_data = data_generic_trace;

1282 trace_data_size = 10;

1283 CodeIClassTagAnswer(trace_data , trace_data_size);

                         memcpy(data_response, ToSend, ToSendMax);

1285 modulated_response = data_response;

1286 modulated_response_size = ToSendMax;

1287 }

                 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,

                         receivedCmd[0], receivedCmd[1], receivedCmd[2],

                         receivedCmd[3], receivedCmd[4], receivedCmd[5],

                         receivedCmd[6], receivedCmd[7], receivedCmd[8]);

1303 // Do not respond

                         modulated_response = resp_sof; modulated_response_size = 0; //order = 0;

1305 trace_data = NULL;

1306 trace_data_size = 0;

1307 }

1308

                 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 **/

                 if(modulated_response_size > 0) {

                         SendIClassAnswer(modulated_response, modulated_response_size, response_delay);

1321 t2r_time = GetCountSspClk();

1322 }

1323

1324 if (tracing) {

1325 uint8_t parity[MAX_PARITY_SIZE];

                         GetParity(receivedCmd, len, parity);

                         LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, (r2t_time-time_0) << 4, parity, TRUE);

1328

1329 if (trace_data != NULL) {

                                 GetParity(trace_data, trace_data_size, parity);

                                 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 }

                 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

 static int SendIClassAnswer(uint8_t *resp, int respLen, int delay)

1355 {

         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()) {

                 if((AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)){

                         b = AT91C_BASE_SSC->SSC_RHR; (void) b;

1367 }

                 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;

                 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 //-----------------------------------------------------------------------------

 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 {

      if(*wait < 10) *wait = 10;

1406

      for(c = 0; c < *wait;) {

        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {

          AT91C_BASE_SSC->SSC_THR = 0x00;                // For exact timing!

1410 c++;

1411 }

        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {

          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(;;) {

     if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {

1427

1428 // DOUBLE THE SAMPLES!

1429 if(firstpart) {

         sendbyte = (cmd[c] & 0xf0) | (cmd[c] >> 4); 

1431 }

1432 else {

         sendbyte = (cmd[c] & 0x0f) | (cmd[c] << 4);

1434 c++;

1435 }

       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 }

     if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {

       volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;

1448 (void)r;

1449 }

1450 WDT_HIT();

1451 }

   if (samples) *samples = (c + *wait) << 3;

1453 }

1454

1455

1456 //-----------------------------------------------------------------------------

1457 // Prepare iClass reader command to send to FPGA

1458 //-----------------------------------------------------------------------------

 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

   for (i = 0; i < len; i++) {

1474 b = cmd[i];

     for(j = 0; j < 4; j++) {

       for(k = 0; k < 4; k++) {

                         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

 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

         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];

                 GetParity(frame, len, par);

                 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 //-----------------------------------------------------------------------------

 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;

         if (elapsed) *elapsed = 0;

1540

1541 bool skip = FALSE;

1542

1543 c = 0;

1544 for(;;) {

1545 WDT_HIT();

1546

                 if(BUTTON_PRESS()) return FALSE;

1548

                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {

                         AT91C_BASE_SSC->SSC_THR = 0x00;  // To make use of exact timing of next command from reader!!

1551 if (elapsed) (*elapsed)++;

1552 }

                 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {

                         if(c < timeout) { c++; } else { return FALSE; }

                         b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;

1556 skip = !skip;

                         if(skip) continue;

1558

                         if(ManchesterDecoding(b & 0x0f)) {

                                 *samples = c << 3;

1561 return TRUE;

1562 }

1563 }

1564 }

1565 }

1566

 int ReaderReceiveIClass(uint8_t* receivedAnswer)

1568 {

1569 int samples = 0;

   if (!GetIClassAnswer(receivedAnswer,160,&samples,0)) return FALSE;

1571 rsamples += samples;

1572 if (tracing) {

1573 uint8_t parity[MAX_PARITY_SIZE];

         GetParity(receivedAnswer, Demod.len, parity);

         LogTrace(receivedAnswer,Demod.len,rsamples,rsamples,parity,FALSE);

1576 }

   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

 size_t sendCmdGetResponseWithRetries(uint8_t* command, size_t cmdsize, uint8_t* resp, uint8_t expected_size, uint8_t retries)

1607 {

         while(retries-- > 0)

1609 {

1610 ReaderTransmitIClass(command, cmdsize);

                 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 */

 uint8_t handshakeIclassTag(uint8_t *card_data)

1626 {

1627 static uint8_t act_all[] = { 0x0a };

1628 static uint8_t identify[] = { 0x0c };

         static uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

1630

1631

         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

         ReaderTransmitIClass(act_all, 1);

1640 // Card present?

         if(!ReaderReceiveIClass(resp)) return read_status;//Fail

1642 //Send Identify

         ReaderTransmitIClass(identify, 1);

1644 //We expect a 10-byte response here, 8 byte anticollision-CSN and 2 byte CRC

         uint8_t len  = ReaderReceiveIClass(resp);

         if(len != 10) return read_status;//Fail

1647

1648 //Copy the Anti-collision CSN to our select-packet

         memcpy(&select[1],resp,8);

1650 //Select the card

         ReaderTransmitIClass(select, sizeof(select));

1652 //We expect a 10-byte response here, 8 byte CSN and 2 byte CRC

1653 len = ReaderReceiveIClass(resp);

         if(len != 10) return read_status;//Fail

1655

1656 //Success - level 1, we got CSN

1657 //Save CSN in response data

         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)

         ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));

         if(ReaderReceiveIClass(resp) == 8) {

1666 //Save CC (e-purse) in response data

                 memcpy(card_data+8,resp,8);

1668 read_status++;

1669 }

1670

1671 return read_status;

1672 }

1673

1674

1675 // Reader iClass Anticollission

 void ReaderIClass(uint8_t arg0) {

1677

         uint8_t card_data[6 * 8]={0};

         memset(card_data, 0xFF, sizeof(card_data));

         uint8_t last_csn[8]={0};

1681

1682 //Read conf block CRC(0x01) => 0xfa 0x22

         uint8_t readConf[] = { ICLASS_CMD_READ_OR_IDENTIFY,0x01, 0xfa, 0x22};

1684 //Read conf block CRC(0x05) => 0xde 0x64

         uint8_t readAA[] = { ICLASS_CMD_READ_OR_IDENTIFY,0x05, 0xde, 0x64};

1686

1687

1688 int read_status= 0;

1689 uint8_t result_status = 0;

1690 bool abort_after_read = arg0 & FLAG_ICLASS_READER_ONLY_ONCE;

1691 bool try_once = arg0 & FLAG_ICLASS_READER_ONE_TRY;

1692 set_tracing(TRUE);

1693 setupIclassReader();

1694

1695 uint16_t tryCnt=0;

1696 while(!BUTTON_PRESS())

1697 {

                 if (try_once && tryCnt > 5) break; 

1699 tryCnt++;

1700 if(!tracing) {

1701 DbpString("Trace full");

1702 break;

1703 }

1704 WDT_HIT();

1705

1706 read_status = handshakeIclassTag(card_data);

1707

                 if(read_status == 0) continue;

                 if(read_status == 1) result_status = FLAG_ICLASS_READER_CSN;

                 if(read_status == 2) result_status = FLAG_ICLASS_READER_CSN|FLAG_ICLASS_READER_CC;

1711

1712 // handshakeIclass returns CSN|CC, but the actual block

1713 // layout is CSN|CONFIG|CC, so here we reorder the data,

1714 // moving CC forward 8 bytes

                 memcpy(card_data+16,card_data+8, 8);

1716 //Read block 1, config

1717 if(arg0 & FLAG_ICLASS_READER_CONF)

1718 {

                         if(sendCmdGetResponseWithRetries(readConf, sizeof(readConf),card_data+8, 10, 10))

1720 {

1721 Dbprintf("Failed to dump config block");

1722 }else

1723 {

1724 result_status |= FLAG_ICLASS_READER_CONF;

1725 }

1726 }

1727

1728 //Read block 5, AA

1729 if(arg0 & FLAG_ICLASS_READER_AA){

                         if(sendCmdGetResponseWithRetries(readAA, sizeof(readAA),card_data+(8*4), 10, 10))

1731 {

1732 // Dbprintf("Failed to dump AA block");

1733 }else

1734 {

1735 result_status |= FLAG_ICLASS_READER_AA;

1736 }

1737 }

1738

1739 // 0 : CSN

1740 // 1 : Configuration

1741 // 2 : e-purse

1742 // (3,4 write-only, kc and kd)

1743 // 5 Application issuer area

1744 //

1745 //Then we can 'ship' back the 8 * 5 bytes of data,

1746 // with 0xFF:s in block 3 and 4.

1747

1748 LED_B_ON();

1749 //Send back to client, but don't bother if we already sent this

                 if(memcmp(last_csn, card_data, 8) != 0)

1751 {

1752 // If caller requires that we get CC, continue until we got it

                         if( (arg0 & read_status & FLAG_ICLASS_READER_CC) || !(arg0 & FLAG_ICLASS_READER_CC))

1754 {

                                 cmd_send(CMD_ACK,result_status,0,0,card_data,sizeof(card_data));

1756 if(abort_after_read) {

1757 LED_A_OFF();

1758 return;

1759 }

1760 //Save that we already sent this....

                                 memcpy(last_csn, card_data, 8);

1762 }

1763

1764 }

1765 LED_B_OFF();

1766 }

     cmd_send(CMD_ACK,0,0,0,card_data, 0);

1768 LED_A_OFF();

1769 }

1770

 void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {

1772

         uint8_t card_data[USB_CMD_DATA_SIZE]={0};

         uint16_t block_crc_LUT[255] = {0};

1775

1776 {//Generate a lookup table for block crc

                 for(int block = 0; block < 255; block++){

1778 char bl = block;

                         block_crc_LUT[block] = iclass_crc16(&bl ,1);

1780 }

1781 }

1782 //Dbprintf("Lookup table: %02x %02x %02x" ,block_crc_LUT[0],block_crc_LUT[1],block_crc_LUT[2]);

1783

         uint8_t check[]       = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

         uint8_t read[]        = { 0x0c, 0x00, 0x00, 0x00 };

1786

1787 uint16_t crc = 0;

1788 uint8_t cardsize=0;

1789 uint8_t mem=0;

1790

1791 static struct memory_t{

1792 int k16;

1793 int book;

1794 int k2;

1795 int lockauth;

1796 int keyaccess;

1797 } memory;

1798

1799 uint8_t resp[ICLASS_BUFFER_SIZE];

1800

1801 setupIclassReader();

1802 set_tracing(TRUE);

1803

1804 while(!BUTTON_PRESS()) {

1805

1806 WDT_HIT();

1807

1808 if(!tracing) {

1809 DbpString("Trace full");

1810 break;

1811 }

1812

                 uint8_t read_status = handshakeIclassTag(card_data);

                 if(read_status < 2) continue;

1815

1816 //for now replay captured auth (as cc not updated)

                 memcpy(check+5,MAC,4);

1818

                 if(sendCmdGetResponseWithRetries(check, sizeof(check),resp, 4, 5))

1820 {

1821 Dbprintf("Error: Authentication Fail!");

1822 continue;

1823 }

1824

1825 //first get configuration block (block 1)

1826 crc = block_crc_LUT[1];

                 read[1]=1;

                 read[2] = crc >> 8;

                 read[3] = crc & 0xff;

1830

                 if(sendCmdGetResponseWithRetries(read, sizeof(read),resp, 10, 10))

1832 {

1833 Dbprintf("Dump config (block 1) failed");

1834 continue;

1835 }

1836

1837 mem=resp[5];

                 memory.k16= (mem & 0x80);

                 memory.book= (mem & 0x20);

                 memory.k2= (mem & 0x8);

                 memory.lockauth= (mem & 0x2);

                 memory.keyaccess= (mem & 0x1);

1843

                 cardsize = memory.k16 ? 255 : 32;

1845 WDT_HIT();

1846 //Set card_data to all zeroes, we'll fill it with data

                 memset(card_data,0x0,USB_CMD_DATA_SIZE);

1848 uint8_t failedRead =0;

1849 uint32_t stored_data_length =0;

1850 //then loop around remaining blocks

                 for(int block=0; block < cardsize; block++){

1852

1853 read[1]= block;

1854 crc = block_crc_LUT[block];

                         read[2] = crc >> 8;

                         read[3] = crc & 0xff;

1857

                         if(!sendCmdGetResponseWithRetries(read, sizeof(read), resp, 10, 10))

1859 {

1860 Dbprintf(" %02x: %02x %02x %02x %02x %02x %02x %02x %02x",

                                                  block, resp[0], resp[1], resp[2],

                                                 resp[3], resp[4], resp[5],

                                                 resp[6], resp[7]);

1864

1865 //Fill up the buffer

                                 memcpy(card_data+stored_data_length,resp,8);

1867 stored_data_length += 8;

                                 if(stored_data_length +8 > USB_CMD_DATA_SIZE)

1869 {//Time to send this off and start afresh

1870 cmd_send(CMD_ACK,

1871 stored_data_length,//data length

1872 failedRead,//Failed blocks?

1873 0,//Not used ATM

1874 card_data, stored_data_length);

1875 //reset

1876 stored_data_length = 0;

1877 failedRead = 0;

1878 }

1879

1880 }else{

1881 failedRead = 1;

1882 stored_data_length +=8;//Otherwise, data becomes misaligned

                                 Dbprintf("Failed to dump block %d", block);

1884 }

1885 }

1886

1887 //Send off any remaining data

                 if(stored_data_length > 0)

1889 {

1890 cmd_send(CMD_ACK,

1891 stored_data_length,//data length

1892 failedRead,//Failed blocks?

1893 0,//Not used ATM

1894 card_data, stored_data_length);

1895 }

1896 //If we got here, let's break

1897 break;

1898 }

1899 //Signal end of transmission

1900 cmd_send(CMD_ACK,

1901 0,//data length

1902 0,//Failed blocks?

1903 0,//Not used ATM

1904 card_data, 0);

1905

1906 LED_A_OFF();

1907 }

1908

1909 //2. Create Read method (cut-down from above) based off responses from 1.

1910 // Since we have the MAC could continue to use replay function.

1911 //3. Create Write method

1912 /*

1913 void IClass_iso14443A_write(uint8_t arg0, uint8_t blockNo, uint8_t *data, uint8_t *MAC) {

1914 uint8_t act_all[] = { 0x0a };

1915 uint8_t identify[] = { 0x0c };

1916 uint8_t select[] = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

1917 uint8_t readcheck_cc[]= { 0x88, 0x02 };

1918 uint8_t check[] = { 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

1919 uint8_t read[] = { 0x0c, 0x00, 0x00, 0x00 };

1920 uint8_t write[] = { 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

1921

1922 uint16_t crc = 0;

1923

1924 uint8_t* resp = (((uint8_t *)BigBuf) + 3560);

1925

1926 // Reset trace buffer

1927 memset(trace, 0x44, RECV_CMD_OFFSET);

1928 traceLen = 0;

1929

1930 // Setup SSC

1931 FpgaSetupSsc();

1932 // Start from off (no field generated)

1933 // Signal field is off with the appropriate LED

1934 LED_D_OFF();

1935 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

1936 SpinDelay(200);

1937

1938 SetAdcMuxFor(GPIO_MUXSEL_HIPKD);

1939

1940 // Now give it time to spin up.

1941 // Signal field is on with the appropriate LED

1942 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);

1943 SpinDelay(200);

1944

1945 LED_A_ON();

1946

1947 for(int i=0;i<1;i++) {

1948

1949 if(traceLen > TRACE_SIZE) {

1950 DbpString("Trace full");

1951 break;

1952 }

1953

1954 if (BUTTON_PRESS()) break;

1955

1956 // Send act_all

1957 ReaderTransmitIClass(act_all, 1);

1958 // Card present?

1959 if(ReaderReceiveIClass(resp)) {

1960 ReaderTransmitIClass(identify, 1);

1961 if(ReaderReceiveIClass(resp) == 10) {

1962 // Select card

1963 memcpy(&select[1],resp,8);

1964 ReaderTransmitIClass(select, sizeof(select));

1965

1966 if(ReaderReceiveIClass(resp) == 10) {

1967 Dbprintf(" Selected CSN: %02x %02x %02x %02x %02x %02x %02x %02x",

1968 resp[0], resp[1], resp[2],

1969 resp[3], resp[4], resp[5],

1970 resp[6], resp[7]);

1971 }

1972 // Card selected

1973 Dbprintf("Readcheck on Sector 2");

1974 ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));

1975 if(ReaderReceiveIClass(resp) == 8) {

1976 Dbprintf(" CC: %02x %02x %02x %02x %02x %02x %02x %02x",

1977 resp[0], resp[1], resp[2],

1978 resp[3], resp[4], resp[5],

1979 resp[6], resp[7]);

1980 }else return;

1981 Dbprintf("Authenticate");

1982 //for now replay captured auth (as cc not updated)

1983 memcpy(check+5,MAC,4);

1984 Dbprintf(" AA: %02x %02x %02x %02x",

1985 check[5], check[6], check[7],check[8]);

1986 ReaderTransmitIClass(check, sizeof(check));

1987 if(ReaderReceiveIClass(resp) == 4) {

1988 Dbprintf(" AR: %02x %02x %02x %02x",

1989 resp[0], resp[1], resp[2],resp[3]);

1990 }else {

1991 Dbprintf("Error: Authentication Fail!");

1992 return;

1993 }

1994 Dbprintf("Write Block");

1995

1996 //read configuration for max block number

1997 read_success=false;

1998 read[1]=1;

1999 uint8_t *blockno=&read[1];

2000 crc = iclass_crc16((char *)blockno,1);

2001 read[2] = crc >> 8;

2002 read[3] = crc & 0xff;

2003 while(!read_success){

2004 ReaderTransmitIClass(read, sizeof(read));

2005 if(ReaderReceiveIClass(resp) == 10) {

2006 read_success=true;

2007 mem=resp[5];

2008 memory.k16= (mem & 0x80);

2009 memory.book= (mem & 0x20);

2010 memory.k2= (mem & 0x8);

2011 memory.lockauth= (mem & 0x2);

2012 memory.keyaccess= (mem & 0x1);

2013

2014 }

2015 }

2016 if (memory.k16){

2017 cardsize=255;

2018 }else cardsize=32;

2019 //check card_size

2020

2021 memcpy(write+1,blockNo,1);

2022 memcpy(write+2,data,8);

2023 memcpy(write+10,mac,4);

2024 while(!send_success){

2025 ReaderTransmitIClass(write, sizeof(write));

2026 if(ReaderReceiveIClass(resp) == 10) {

2027 write_success=true;

2028 }

2029 }//

2030 }

2031 WDT_HIT();

2032 }

2033

2034 LED_A_OFF();

2035 }*/