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 #include "iso14443a.h"

46 // Needed for CRC in emulation mode;

47 // same construction as in ISO 14443;

48 // different initial value (CRC_ICLASS)

49 #include "iso14443crc.h"

50 #include "iso15693tools.h"

51 #include "protocols.h"

52 #include "optimized_cipher.h"

53 #include "usb_cdc.h" // for usb_poll_validate_length

55 static int timeout = 4096;

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

60 //-----------------------------------------------------------------------------

61 // The software UART that receives commands from the reader, and its state

62 // variables.

63 //-----------------------------------------------------------------------------

64 static struct {

65 enum {

66 STATE_UNSYNCD,

67 STATE_START_OF_COMMUNICATION,

68 STATE_RECEIVING

69 } state;

70 uint16_t shiftReg;

71 int bitCnt;

72 int byteCnt;

73 int byteCntMax;

74 int posCnt;

75 int nOutOfCnt;

76 int OutOfCnt;

77 int syncBit;

78 int samples;

79 int highCnt;

80 int swapper;

81 int counter;

82 int bitBuffer;

83 int dropPosition;

84 uint8_t *output;

85 } Uart;

 static RAMFUNC int OutOfNDecoding(int bit)

88 {

89 //int error = 0;

90 int bitright;

92 if(!Uart.bitBuffer) {

                 Uart.bitBuffer = bit ^ 0xFF0;

94 return FALSE;

95 }

96 else {

97 Uart.bitBuffer <<= 4;

98 Uart.bitBuffer ^= bit;

99 }

100

101 /*if(Uart.swapper) {

102 Uart.output[Uart.byteCnt] = Uart.bitBuffer & 0xFF;

103 Uart.byteCnt++;

104 Uart.swapper = 0;

105 if(Uart.byteCnt > 15) { return TRUE; }

106 }

107 else {

108 Uart.swapper = 1;

109 }*/

110

         if(Uart.state != STATE_UNSYNCD) {

112 Uart.posCnt++;

113

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

115 bit = 0x00;

116 }

117 else {

118 bit = 0x01;

119 }

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

121 bitright = 0x00;

122 }

123 else {

124 bitright = 0x01;

125 }

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

127

128

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

                 if(Uart.posCnt == 1) {

131 // measurement first half bitperiod

132 if(!bit) {

133 // Drop in first half means that we are either seeing

134 // an SOF or an EOF.

135

                                 if(Uart.nOutOfCnt == 1) {

137 // End of Communication

138 Uart.state = STATE_UNSYNCD;

139 Uart.highCnt = 0;

                                         if(Uart.byteCnt == 0) {

141 // Its not straightforward to show single EOFs

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

                                                 Uart.output[0] = 0xf0;

144 Uart.byteCnt++;

145 }

146 else {

147 return TRUE;

148 }

149 }

                                 else if(Uart.state != STATE_START_OF_COMMUNICATION) {

151 // When not part of SOF or EOF, it is an error

152 Uart.state = STATE_UNSYNCD;

153 Uart.highCnt = 0;

154 //error = 4;

155 }

156 }

157 }

158 else {

159 // measurement second half bitperiod

160 // Count the bitslot we are in... (ISO 15693)

161 Uart.nOutOfCnt++;

162

163 if(!bit) {

164 if(Uart.dropPosition) {

                                         if(Uart.state == STATE_START_OF_COMMUNICATION) {

166 //error = 1;

167 }

168 else {

169 //error = 7;

170 }

171 // It is an error if we already have seen a drop in current frame

172 Uart.state = STATE_UNSYNCD;

173 Uart.highCnt = 0;

174 }

175 else {

176 Uart.dropPosition = Uart.nOutOfCnt;

177 }

178 }

179

180 Uart.posCnt = 0;

181

182

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

184 Uart.nOutOfCnt = 0;

185

                                 if(Uart.state == STATE_START_OF_COMMUNICATION) {

                                         if(Uart.dropPosition == 4) {

188 Uart.state = STATE_RECEIVING;

189 Uart.OutOfCnt = 256;

190 }

                                         else if(Uart.dropPosition == 3) {

192 Uart.state = STATE_RECEIVING;

193 Uart.OutOfCnt = 4;

194 //Uart.output[Uart.byteCnt] = 0xdd;

195 //Uart.byteCnt++;

196 }

197 else {

198 Uart.state = STATE_UNSYNCD;

199 Uart.highCnt = 0;

200 }

201 Uart.dropPosition = 0;

202 }

203 else {

204 // RECEIVING DATA

205 // 1 out of 4

206 if(!Uart.dropPosition) {

207 Uart.state = STATE_UNSYNCD;

208 Uart.highCnt = 0;

209 //error = 9;

210 }

211 else {

212 Uart.shiftReg >>= 2;

213

214 // Swap bit order

215 Uart.dropPosition--;

216 //if(Uart.dropPosition == 1) { Uart.dropPosition = 2; }

217 //else if(Uart.dropPosition == 2) { Uart.dropPosition = 1; }

218

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

220 Uart.bitCnt += 2;

221 Uart.dropPosition = 0;

222

                                                 if(Uart.bitCnt == 8) {

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

225 Uart.byteCnt++;

226 Uart.bitCnt = 0;

227 Uart.shiftReg = 0;

228 }

229 }

230 }

231 }

                         else if(Uart.nOutOfCnt == Uart.OutOfCnt) {

233 // RECEIVING DATA

234 // 1 out of 256

235 if(!Uart.dropPosition) {

236 Uart.state = STATE_UNSYNCD;

237 Uart.highCnt = 0;

238 //error = 3;

239 }

240 else {

241 Uart.dropPosition--;

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

243 Uart.byteCnt++;

244 Uart.bitCnt = 0;

245 Uart.shiftReg = 0;

246 Uart.nOutOfCnt = 0;

247 Uart.dropPosition = 0;

248 }

249 }

250

251 /*if(error) {

252 Uart.output[Uart.byteCnt] = 0xAA;

253 Uart.byteCnt++;

254 Uart.output[Uart.byteCnt] = error & 0xFF;

255 Uart.byteCnt++;

256 Uart.output[Uart.byteCnt] = 0xAA;

257 Uart.byteCnt++;

258 Uart.output[Uart.byteCnt] = (Uart.bitBuffer >> 8) & 0xFF;

259 Uart.byteCnt++;

260 Uart.output[Uart.byteCnt] = Uart.bitBuffer & 0xFF;

261 Uart.byteCnt++;

262 Uart.output[Uart.byteCnt] = (Uart.syncBit >> 3) & 0xFF;

263 Uart.byteCnt++;

264 Uart.output[Uart.byteCnt] = 0xAA;

265 Uart.byteCnt++;

266 return TRUE;

267 }*/

268 }

269

270 }

271 else {

                 bit = Uart.bitBuffer & 0xf0;

273 bit >>= 4;

274 bit ^= 0x0F; // drops become 1s ;-)

275 if(bit) {

276 // should have been high or at least (4 * 128) / fc

277 // according to ISO this should be at least (9 * 128 + 20) / fc

                         if(Uart.highCnt == 8) {

279 // we went low, so this could be start of communication

280 // it turns out to be safer to choose a less significant

281 // 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;

284 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)) {

291 Uart.syncBit = 8;

292

293 // the first half bit period is expected in next sample

294 Uart.posCnt = 0;

295 Uart.samples = 3;

296 }

297 }

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

299

300 Uart.syncBit <<= 4;

301 Uart.state = STATE_START_OF_COMMUNICATION;

302 Uart.bitCnt = 0;

303 Uart.byteCnt = 0;

304 Uart.nOutOfCnt = 0;

                                 Uart.OutOfCnt = 4; // Start at 1/4, could switch to 1/256

306 Uart.dropPosition = 0;

307 Uart.shiftReg = 0;

308 //error = 0;

309 }

310 else {

311 Uart.highCnt = 0;

312 }

313 }

314 else {

                         if(Uart.highCnt < 8) {

316 Uart.highCnt++;

317 }

318 }

319 }

320

321 return FALSE;

322 }

323

324 //=============================================================================

325 // Manchester

326 //=============================================================================

327

328 static struct {

329 enum {

330 DEMOD_UNSYNCD,

331 DEMOD_START_OF_COMMUNICATION,

332 DEMOD_START_OF_COMMUNICATION2,

333 DEMOD_START_OF_COMMUNICATION3,

334 DEMOD_SOF_COMPLETE,

335 DEMOD_MANCHESTER_D,

336 DEMOD_MANCHESTER_E,

337 DEMOD_END_OF_COMMUNICATION,

338 DEMOD_END_OF_COMMUNICATION2,

339 DEMOD_MANCHESTER_F,

340 DEMOD_ERROR_WAIT

341 } state;

342 int bitCount;

343 int posCount;

344 int syncBit;

345 uint16_t shiftReg;

346 int buffer;

347 int buffer2;

348 int buffer3;

349 int buff;

350 int samples;

351 int len;

352 enum {

353 SUB_NONE,

354 SUB_FIRST_HALF,

355 SUB_SECOND_HALF,

356 SUB_BOTH

357 } sub;

358 uint8_t *output;

359 } Demod;

360

 static RAMFUNC int ManchesterDecoding(int v)

362 {

363 int bit;

364 int modulation;

365 int error = 0;

366

367 bit = Demod.buffer;

368 Demod.buffer = Demod.buffer2;

369 Demod.buffer2 = Demod.buffer3;

370 Demod.buffer3 = v;

371

         if(Demod.buff < 3) {

373 Demod.buff++;

374 return FALSE;

375 }

376

         if(Demod.state==DEMOD_UNSYNCD) {

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

379 Demod.syncBit = 0;

380 //Demod.samples = 0;

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

382

                 if(bit & 0x08) {

384 Demod.syncBit = 0x08;

385 }

386

                 if(bit & 0x04) {

388 if(Demod.syncBit) {

389 bit <<= 4;

390 }

391 Demod.syncBit = 0x04;

392 }

393

                 if(bit & 0x02) {

395 if(Demod.syncBit) {

396 bit <<= 2;

397 }

398 Demod.syncBit = 0x02;

399 }

400

                 if(bit & 0x01 && Demod.syncBit) {

402 Demod.syncBit = 0x01;

403 }

404

405 if(Demod.syncBit) {

406 Demod.len = 0;

407 Demod.state = DEMOD_START_OF_COMMUNICATION;

408 Demod.sub = SUB_FIRST_HALF;

409 Demod.bitCount = 0;

410 Demod.shiftReg = 0;

411 Demod.samples = 0;

412 if(Demod.posCount) {

413 //if(trigger) LED_A_OFF(); // Not useful in this case...

414 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;

419 }

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

                                 if(!(Demod.buffer & Demod.syncBit) || !(Demod.buffer2 & Demod.syncBit)) {

422 Demod.state = DEMOD_UNSYNCD;

423 }

424 }

425 else {

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

                                 if(!(Demod.buffer2 & Demod.syncBit) || !(Demod.buffer3 & Demod.syncBit)) {

428 Demod.state = DEMOD_UNSYNCD;

429 error = 0x88;

430 }

431

432 }

433 error = 0;

434

435 }

436 }

437 else {

438 modulation = bit & Demod.syncBit;

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

440

441 Demod.samples += 4;

442

                 if(Demod.posCount==0) {

444 Demod.posCount = 1;

445 if(modulation) {

446 Demod.sub = SUB_FIRST_HALF;

447 }

448 else {

449 Demod.sub = SUB_NONE;

450 }

451 }

452 else {

453 Demod.posCount = 0;

454 /*(modulation && (Demod.sub == SUB_FIRST_HALF)) {

455 if(Demod.state!=DEMOD_ERROR_WAIT) {

456 Demod.state = DEMOD_ERROR_WAIT;

457 Demod.output[Demod.len] = 0xaa;

458 error = 0x01;

459 }

460 }*/

461 //else if(modulation) {

462 if(modulation) {

                                 if(Demod.sub == SUB_FIRST_HALF) {

464 Demod.sub = SUB_BOTH;

465 }

466 else {

467 Demod.sub = SUB_SECOND_HALF;

468 }

469 }

                         else if(Demod.sub == SUB_NONE) {

                                 if(Demod.state == DEMOD_SOF_COMPLETE) {

                                         Demod.output[Demod.len] = 0x0f;

473 Demod.len++;

474 Demod.state = DEMOD_UNSYNCD;

475 // error = 0x0f;

476 return TRUE;

477 }

478 else {

479 Demod.state = DEMOD_ERROR_WAIT;

480 error = 0x33;

481 }

482 /*if(Demod.state!=DEMOD_ERROR_WAIT) {

483 Demod.state = DEMOD_ERROR_WAIT;

484 Demod.output[Demod.len] = 0xaa;

485 error = 0x01;

486 }*/

487 }

488

489 switch(Demod.state) {

490 case DEMOD_START_OF_COMMUNICATION:

                                         if(Demod.sub == SUB_BOTH) {

492 //Demod.state = DEMOD_MANCHESTER_D;

493 Demod.state = DEMOD_START_OF_COMMUNICATION2;

494 Demod.posCount = 1;

495 Demod.sub = SUB_NONE;

496 }

497 else {

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

499 Demod.state = DEMOD_ERROR_WAIT;

500 error = 0xd2;

501 }

502 break;

503 case DEMOD_START_OF_COMMUNICATION2:

                                         if(Demod.sub == SUB_SECOND_HALF) {

505 Demod.state = DEMOD_START_OF_COMMUNICATION3;

506 }

507 else {

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

509 Demod.state = DEMOD_ERROR_WAIT;

510 error = 0xd3;

511 }

512 break;

513 case DEMOD_START_OF_COMMUNICATION3:

                                         if(Demod.sub == SUB_SECOND_HALF) {

515 // Demod.state = DEMOD_MANCHESTER_D;

516 Demod.state = DEMOD_SOF_COMPLETE;

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

518 //Demod.len++;

519 }

520 else {

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

522 Demod.state = DEMOD_ERROR_WAIT;

523 error = 0xd4;

524 }

525 break;

526 case DEMOD_SOF_COMPLETE:

527 case DEMOD_MANCHESTER_D:

528 case DEMOD_MANCHESTER_E:

529 // OPPOSITE FROM ISO14443 - 11110000 = 0 (1 in 14443)

530 // 00001111 = 1 (0 in 14443)

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

532 Demod.bitCount++;

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

534 Demod.state = DEMOD_MANCHESTER_D;

535 }

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

537 Demod.bitCount++;

538 Demod.shiftReg >>= 1;

539 Demod.state = DEMOD_MANCHESTER_E;

540 }

                                         else if(Demod.sub == SUB_BOTH) {

542 Demod.state = DEMOD_MANCHESTER_F;

543 }

544 else {

545 Demod.state = DEMOD_ERROR_WAIT;

546 error = 0x55;

547 }

548 break;

549

550 case DEMOD_MANCHESTER_F:

551 // 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;

556 Demod.len++;

557 }

558

559 Demod.state = DEMOD_UNSYNCD;

560 return TRUE;

561 }

562 else {

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

564 Demod.state = DEMOD_ERROR_WAIT;

565 error = 0x03;

566 }

567 break;

568

569 case DEMOD_ERROR_WAIT:

570 Demod.state = DEMOD_UNSYNCD;

571 break;

572

573 default:

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

575 Demod.state = DEMOD_UNSYNCD;

576 break;

577 }

578

579 /*if(Demod.bitCount>=9) {

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

581 Demod.len++;

582

583 Demod.parityBits <<= 1;

584 Demod.parityBits ^= ((Demod.shiftReg >> 8) & 0x01);

585

586 Demod.bitCount = 0;

587 Demod.shiftReg = 0;

588 }*/

                         if(Demod.bitCount>=8) {

590 Demod.shiftReg >>= 1;

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

592 Demod.len++;

593 Demod.bitCount = 0;

594 Demod.shiftReg = 0;

595 }

596

597 if(error) {

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

599 Demod.len++;

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

601 Demod.len++;

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

603 Demod.len++;

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

605 Demod.len++;

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

607 Demod.len++;

608 // Look harder ;-)

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

610 Demod.len++;

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

612 Demod.len++;

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

614 Demod.len++;

615 return TRUE;

616 }

617

618 }

619

620 } // end (state != UNSYNCED)

621

622 return FALSE;

623 }

624

625 //=============================================================================

626 // Finally, a `sniffer' for iClass communication

627 // Both sides of communication!

628 //=============================================================================

629

630 //-----------------------------------------------------------------------------

631 // Record the sequence of commands sent by the reader to the tag, with

632 // triggering so that we start recording at the point that the tag is moved

633 // near the reader.

634 //-----------------------------------------------------------------------------

 void RAMFUNC SnoopIClass(void)

636 {

637

638

639 // We won't start recording the frames that we acquire until we trigger;

640 // a good trigger condition to get started is probably when we see a

641 // response from the tag.

642 //int triggered = FALSE; // FALSE to wait first for card

643

644 // The command (reader -> tag) that we're receiving.

645 // The length of a received command will in most cases be no more than 18 bytes.

646 // So 32 should be enough!

647 #define ICLASS_BUFFER_SIZE 32

648 uint8_t readerToTagCmd[ICLASS_BUFFER_SIZE];

649 // The response (tag -> reader) that we're receiving.

650 uint8_t tagToReaderResponse[ICLASS_BUFFER_SIZE];

651

652 FpgaDownloadAndGo(FPGA_BITSTREAM_HF);

653

654 // free all BigBuf memory

655 BigBuf_free();

656 // The DMA buffer, used to stream samples from the FPGA

     uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);

658

659 set_tracing(TRUE);

660 clear_trace();

661 iso14a_set_trigger(FALSE);

662

663 int lastRxCounter;

664 uint8_t *upTo;

665 int smpl;

666 int maxBehindBy = 0;

667

668 // Count of samples received so far, so that we can include timing

669 // information in the trace buffer.

670 int samples = 0;

671 rsamples = 0;

672

673 // Set up the demodulator for tag -> reader responses.

674 Demod.output = tagToReaderResponse;

675 Demod.len = 0;

676 Demod.state = DEMOD_UNSYNCD;

677

678 // Setup for the DMA.

679 FpgaSetupSsc();

680 upTo = dmaBuf;

681 lastRxCounter = DMA_BUFFER_SIZE;

     FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);

683

684 // And the reader -> tag commands

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

686 Uart.output = readerToTagCmd;

     Uart.byteCntMax = 32; // was 100 (greg)////////////////////////////////////////////////////////////////////////

688 Uart.state = STATE_UNSYNCD;

689

690 // And put the FPGA in the appropriate mode

691 // Signal field is off with the appropriate LED

692 LED_D_OFF();

693 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);

694 SetAdcMuxFor(GPIO_MUXSEL_HIPKD);

695

696 uint32_t time_0 = GetCountSspClk();

697 uint32_t time_start = 0;

698 uint32_t time_stop = 0;

699

700 int div = 0;

701 //int div2 = 0;

702 int decbyte = 0;

703 int decbyter = 0;

704

705 // And now we loop, receiving samples.

706 for(;;) {

707 LED_A_ON();

708 WDT_HIT();

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

710 (DMA_BUFFER_SIZE-1);

711 if(behindBy > maxBehindBy) {

712 maxBehindBy = behindBy;

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

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

715 goto done;

716 }

717 }

         if(behindBy < 1) continue;

719

720 LED_A_OFF();

721 smpl = upTo[0];

722 upTo++;

723 lastRxCounter -= 1;

         if(upTo - dmaBuf > DMA_BUFFER_SIZE) {

725 upTo -= DMA_BUFFER_SIZE;

726 lastRxCounter += DMA_BUFFER_SIZE;

             AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;

728 AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;

729 }

730

731 //samples += 4;

732 samples += 1;

733

         if(smpl & 0xF) {

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

736 }

737

738 // FOR READER SIDE COMMUMICATION...

739

740 decbyter <<= 2;

741 decbyter ^= (smpl & 0x30);

742

743 div++;

744

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

746 smpl = decbyter;

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

748 rsamples = samples - Uart.samples;

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

750 LED_C_ON();

751

752 //if(!LogTrace(Uart.output,Uart.byteCnt, rsamples, Uart.parityBits,TRUE)) break;

753 //if(!LogTrace(NULL, 0, Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, 0, TRUE)) break;

754 if(tracing) {

755 uint8_t parity[MAX_PARITY_SIZE];

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

                                 LogTrace(Uart.output,Uart.byteCnt, time_start, time_stop, parity, TRUE);

758 }

759

760

761 /* And ready to receive another command. */

762 Uart.state = STATE_UNSYNCD;

763 /* And also reset the demod code, which might have been */

764 /* false-triggered by the commands from the reader. */

765 Demod.state = DEMOD_UNSYNCD;

766 LED_B_OFF();

767 Uart.byteCnt = 0;

768 }else{

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

770 }

771 decbyter = 0;

772 }

773

         if(div > 3) {

775 smpl = decbyte;

                 if(ManchesterDecoding(smpl & 0x0F)) {

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

778

779 rsamples = samples - Demod.samples;

780 LED_B_ON();

781

782 if(tracing) {

783 uint8_t parity[MAX_PARITY_SIZE];

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

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

786 }

787

788 // And ready to receive another response.

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

790 Demod.output = tagToReaderResponse;

791 Demod.state = DEMOD_UNSYNCD;

792 LED_C_OFF();

793 }else{

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

795 }

796

797 div = 0;

798 decbyte = 0x00;

799 }

800 //}

801

802 if(BUTTON_PRESS()) {

803 DbpString("cancelled_a");

804 goto done;

805 }

806 }

807

808 DbpString("COMMAND FINISHED");

809

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

         Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);

812

813 done:

814 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]);

817 LED_A_OFF();

818 LED_B_OFF();

819 LED_C_OFF();

820 LED_D_OFF();

821 }

822

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

824 int i;

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

                 rotatedCSN[i] = (originalCSN[i] >> 3) | (originalCSN[(i+1)%8] << 5);

827 }

828 }

829

830 //-----------------------------------------------------------------------------

831 // Wait for commands from reader

832 // Stop when button is pressed

833 // Or return TRUE when command is captured

834 //-----------------------------------------------------------------------------

 static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)

836 {

837 // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen

838 // only, since we are receiving, not transmitting).

839 // Signal field is off with the appropriate LED

840 LED_D_OFF();

841 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);

842

843 // Now run a `software UART' on the stream of incoming samples.

844 Uart.output = received;

845 Uart.byteCntMax = maxLen;

846 Uart.state = STATE_UNSYNCD;

847

848 for(;;) {

849 WDT_HIT();

850

         if(BUTTON_PRESS()) return FALSE;

852

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

854 AT91C_BASE_SSC->SSC_THR = 0x00;

855 }

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

             uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;

858

                         if(OutOfNDecoding(b & 0x0f)) {

860 *len = Uart.byteCnt;

861 return TRUE;

862 }

863 }

864 }

865 }

866

 static uint8_t encode4Bits(const uint8_t b)

868 {

         uint8_t c = b & 0xF;

870 // OTA, the least significant bits first

871 // The columns are

872 // 1 - Bit value to send

873 // 2 - Reversed (big-endian)

874 // 3 - Encoded

875 // 4 - Hex values

876

877 switch(c){

878 // 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

895

896 }

897 }

898

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

900 // Prepare tag messages

901 //-----------------------------------------------------------------------------

 static void CodeIClassTagAnswer(const uint8_t *cmd, int len)

903 {

904

905 /*

906 * SOF comprises 3 parts;

907 * * An unmodulated time of 56.64 us

908 * * 24 pulses of 423.75 KHz (fc/32)

909 * * A logic 1, which starts with an unmodulated time of 18.88us

910 * followed by 8 pulses of 423.75kHz (fc/32)

911 *

912 *

913 * EOF comprises 3 parts:

914 * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated

915 * time of 18.88us.

916 * - 24 pulses of fc/32

917 * - An unmodulated time of 56.64 us

918 *

919 *

920 * A logic 0 starts with 8 pulses of fc/32

921 * followed by an unmodulated time of 256/fc (~18,88us).

922 *

923 * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by

924 * 8 pulses of fc/32 (also 18.88us)

925 *

926 * The mode FPGA_HF_SIMULATOR_MODULATE_424K_8BIT which we use to simulate tag,

927 * works like this.

928 * - A 1-bit input to the FPGA becomes 8 pulses on 423.5kHz (fc/32) (18.88us).

929 * - A 0-bit inptu to the FPGA becomes an unmodulated time of 18.88us

930 *

931 * In this mode the SOF can be written as 00011101 = 0x1D

932 * The EOF can be written as 10111000 = 0xb8

933 * A logic 1 is 01

934 * A logic 0 is 10

935 *

936 * */

937

938 int i;

939

940 ToSendReset();

941

942 // Send SOF

943 ToSend[++ToSendMax] = 0x1D;

944

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

946 uint8_t b = cmd[i];

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

                 ToSend[++ToSendMax] = encode4Bits((b >>4) & 0xF);//Most significant half

949 }

950

951 // Send EOF

952 ToSend[++ToSendMax] = 0xB8;

953 //lastProxToAirDuration = 8*ToSendMax - 3*8 - 3*8;//Not counting zeroes in the beginning or end

954 // Convert from last byte pos to length

955 ToSendMax++;

956 }

957

958 // Only SOF

959 static void CodeIClassTagSOF()

960 {

961 //So far a dummy implementation, not used

962 //int lastProxToAirDuration =0;

963

964 ToSendReset();

965 // Send SOF

966 ToSend[++ToSendMax] = 0x1D;

967 // lastProxToAirDuration = 8*ToSendMax - 3*8;//Not counting zeroes in the beginning

968

969 // Convert from last byte pos to length

970 ToSendMax++;

971 }

972 #define MODE_SIM_CSN 0

973 #define MODE_EXIT_AFTER_MAC 1

974 #define MODE_FULLSIM 2

975

 int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf);

977 /**

978 * @brief SimulateIClass simulates an iClass card.

979 * @param arg0 type of simulation

980 * - 0 uses the first 8 bytes in usb data as CSN

981 * - 2 "dismantling iclass"-attack. This mode iterates through all CSN's specified

982 * in the usb data. This mode collects MAC from the reader, in order to do an offline

983 * attack on the keys. For more info, see "dismantling iclass" and proxclone.com.

984 * - Other : Uses the default CSN (031fec8af7ff12e0)

985 * @param arg1 - number of CSN's contained in datain (applicable for mode 2 only)

986 * @param arg2

987 * @param datain

988 */

 void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain)

990 {

991 uint32_t simType = arg0;

992 uint32_t numberOfCSNS = arg1;

993 FpgaDownloadAndGo(FPGA_BITSTREAM_HF);

994

995 // Enable and clear the trace

996 set_tracing(TRUE);

997 clear_trace();

998 //Use the emulator memory for SIM

         uint8_t *emulator = BigBuf_get_EM_addr();

1000

         if(simType == 0) {

1002 // Use the CSN from commandline

                 memcpy(emulator, datain, 8);

1004 doIClassSimulation(MODE_SIM_CSN,NULL);

         }else if(simType == 1)

1006 {

1007 //Default CSN

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

1009 // Use the CSN from commandline

                 memcpy(emulator, csn_crc, 8);

1011 doIClassSimulation(MODE_SIM_CSN,NULL);

1012 }

         else if(simType == 2)

1014 {

1015

                 uint8_t mac_responses[USB_CMD_DATA_SIZE] = { 0 };

                 Dbprintf("Going into attack mode, %d CSNS sent", numberOfCSNS);

1018 // In this mode, a number of csns are within datain. We'll simulate each one, one at a time

1019 // in order to collect MAC's from the reader. This can later be used in an offlne-attack

1020 // in order to obtain the keys, as in the "dismantling iclass"-paper.

1021 int i = 0;

                 for( ; i < numberOfCSNS && i*8+8 < USB_CMD_DATA_SIZE; i++)

1023 {

1024 // The usb data is 512 bytes, fitting 65 8-byte CSNs in there.

1025

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

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

1028 {

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

1030 return; // Button pressed

1031 }

1032 }

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

1034

         }else if(simType == 3){

1036 //This is 'full sim' mode, where we use the emulator storage for data.

1037 doIClassSimulation(MODE_FULLSIM, NULL);

1038 }

1039 else{

1040 // We may want a mode here where we hardcode the csns to use (from proxclone).

1041 // That will speed things up a little, but not required just yet.

1042 Dbprintf("The mode is not implemented, reserved for future use");

1043 }

1044 Dbprintf("Done...");

1045

1046 }

 void AppendCrc(uint8_t* data, int len)

1048 {

         ComputeCrc14443(CRC_ICLASS,data,len,data+len,data+len+1);

1050 }

1051

1052 /**

1053 * @brief Does the actual simulation

1054 * @param csn - csn to use

1055 * @param breakAfterMacReceived if true, returns after reader MAC has been received.

1056 */

 int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf)

1058 {

1059 // free eventually allocated BigBuf memory

1060 BigBuf_free_keep_EM();

1061

1062 State cipher_state;

1063 // State cipher_state_reserve;

         uint8_t *csn = BigBuf_get_EM_addr();

1065 uint8_t *emulator = csn;

1066 uint8_t sof_data[] = { 0x0F} ;

1067 // 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]);

1072

1073 // Construct anticollision-CSN

1074 rotateCSN(csn_data,anticoll_data);

1075

1076 // 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]);

1079

         uint8_t diversified_key[8] = { 0 };

1081 // e-Purse

         uint8_t card_challenge_data[8] = { 0x00 };

1083 if(simulationMode == MODE_FULLSIM)

1084 {

1085 //The diversified key should be stored on block 3

1086 //Get the diversified key from emulator memory

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

1088

1089 //Card challenge, a.k.a e-purse is on block 2

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

1091 //Precalculate the cipher state, feeding it the CC

                 cipher_state = opt_doTagMAC_1(card_challenge_data,diversified_key);

1093

1094 }

1095

1096 int exitLoop = 0;

1097 // Reader 0a

1098 // Tag 0f

1099 // Reader 0c

1100 // Tag anticoll. CSN

1101 // Reader 81 anticoll. CSN

1102 // Tag CSN

1103

1104 uint8_t *modulated_response;

1105 int modulated_response_size = 0;

1106 uint8_t* trace_data = NULL;

1107 int trace_data_size = 0;

1108

1109

1110 // Respond SOF -- takes 1 bytes

         uint8_t *resp_sof = BigBuf_malloc(2);

1112 int resp_sof_Len;

1113

1114 // Anticollision CSN (rotated CSN)

1115 // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)

         uint8_t *resp_anticoll = BigBuf_malloc(28);

1117 int resp_anticoll_len;

1118

1119 // CSN

1120 // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)

         uint8_t *resp_csn = BigBuf_malloc(30);

1122 int resp_csn_len;

1123

1124 // e-Purse

1125 // 18: Takes 2 bytes for SOF/EOF and 8 * 2 = 16 bytes (2 bytes/bit)

         uint8_t *resp_cc = BigBuf_malloc(20);

1127 int resp_cc_len;

1128

         uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);

1130 int len;

1131

1132 // Prepare card messages

1133 ToSendMax = 0;

1134

1135 // First card answer: SOF

1136 CodeIClassTagSOF();

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

1138

1139 // Anticollision CSN

         CodeIClassTagAnswer(anticoll_data, sizeof(anticoll_data));

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

1142

1143 // CSN

         CodeIClassTagAnswer(csn_data, sizeof(csn_data));

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

1146

1147 // e-Purse

         CodeIClassTagAnswer(card_challenge_data, sizeof(card_challenge_data));

         memcpy(resp_cc, ToSend, ToSendMax); resp_cc_len = ToSendMax;

1150

1151 //This is used for responding to READ-block commands or other data which is dynamically generated

1152 //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

1154 //Then storage for the modulated data

1155 //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);

1157

1158 // Start from off (no field generated)

1159 //FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

1160 //SpinDelay(200);

1161 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);

1162 SpinDelay(100);

1163 StartCountSspClk();

1164 // We need to listen to the high-frequency, peak-detected path.

1165 SetAdcMuxFor(GPIO_MUXSEL_HIPKD);

1166 FpgaSetupSsc();

1167

1168 // To control where we are in the protocol

1169 int cmdsRecvd = 0;

1170 uint32_t time_0 = GetCountSspClk();

1171 uint32_t t2r_time =0;

1172 uint32_t r2t_time =0;

1173

1174 LED_A_ON();

1175 bool buttonPressed = false;

1176 uint8_t response_delay = 1;

1177 while(!exitLoop) {

1178 response_delay = 1;

1179 LED_B_OFF();

1180 //Signal tracer

1181 // Can be used to get a trigger for an oscilloscope..

1182 LED_C_OFF();

1183

                 if(!GetIClassCommandFromReader(receivedCmd, &len, 100)) {

1185 buttonPressed = true;

1186 break;

1187 }

1188 r2t_time = GetCountSspClk();

1189 //Signal tracer

1190 LED_C_ON();

1191

1192 // Okay, look at the command now.

                 if(receivedCmd[0] == ICLASS_CMD_ACTALL ) {

1194 // Reader in anticollission phase

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

1196 trace_data = sof_data;

1197 trace_data_size = sizeof(sof_data);

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

1199 // Reader asks for anticollission CSN

                         modulated_response = resp_anticoll; modulated_response_size = resp_anticoll_len; //order = 2;

1201 trace_data = anticoll_data;

1202 trace_data_size = sizeof(anticoll_data);

1203 //DbpString("Reader requests anticollission CSN:");

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

1205 // Reader selects anticollission CSN.

1206 // Tag sends the corresponding real CSN

                         modulated_response = resp_csn; modulated_response_size = resp_csn_len; //order = 3;

1208 trace_data = csn_data;

1209 trace_data_size = sizeof(csn_data);

1210 //DbpString("Reader selects anticollission CSN:");

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

1212 // Read e-purse (88 02)

                         modulated_response = resp_cc; modulated_response_size = resp_cc_len; //order = 4;

1214 trace_data = card_challenge_data;

1215 trace_data_size = sizeof(card_challenge_data);

1216 LED_B_ON();

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

1218 // Reader random and reader MAC!!!

1219 if(simulationMode == MODE_FULLSIM)

1220 {

1221 //NR, from reader, is in receivedCmd +1

                                 opt_doTagMAC_2(cipher_state,receivedCmd+1,data_generic_trace,diversified_key);

1223

1224 trace_data = data_generic_trace;

1225 trace_data_size = 4;

1226 CodeIClassTagAnswer(trace_data , trace_data_size);

                                 memcpy(data_response, ToSend, ToSendMax);

1228 modulated_response = data_response;

1229 modulated_response_size = ToSendMax;

1230 response_delay = 0;//We need to hurry here...

1231 //exitLoop = true;

1232 }else

1233 { //Not fullsim, we don't respond

1234 // We do not know what to answer, so lets keep quiet

                                 modulated_response = resp_sof; modulated_response_size = 0;

1236 trace_data = NULL;

1237 trace_data_size = 0;

1238 if (simulationMode == MODE_EXIT_AFTER_MAC){

1239 // dbprintf:ing ...

1240 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]);

1246 if (reader_mac_buf != NULL)

1247 {

                                                 memcpy(reader_mac_buf,receivedCmd+1,8);

1249 }

1250 exitLoop = true;

1251 }

1252 }

1253

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

1255 // Reader ends the session

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

1257 trace_data = NULL;

1258 trace_data_size = 0;

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

1260 //Read block

                         uint16_t blk = receivedCmd[1];

1262 //Take the data...

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

1264 //Add crc

                         AppendCrc(data_generic_trace, 8);

1266 trace_data = data_generic_trace;

1267 trace_data_size = 10;

1268 CodeIClassTagAnswer(trace_data , trace_data_size);

                         memcpy(data_response, ToSend, ToSendMax);

1270 modulated_response = data_response;

1271 modulated_response_size = ToSendMax;

                 }else if(receivedCmd[0] == ICLASS_CMD_UPDATE && simulationMode == MODE_FULLSIM)

1273 {//Probably the reader wants to update the nonce. Let's just ignore that for now.

1274 // OBS! If this is implemented, don't forget to regenerate the cipher_state

1275 //We're expected to respond with the data+crc, exactly what's already in the receivedcmd

1276 //receivedcmd is now UPDATE 1b | ADDRESS 1b| DATA 8b| Signature 4b or CRC 2b|

1277

1278 //Take the data...

                         memcpy(data_generic_trace, receivedCmd+2,8);

1280 //Add crc

                         AppendCrc(data_generic_trace, 8);

1282 trace_data = data_generic_trace;

1283 trace_data_size = 10;

1284 CodeIClassTagAnswer(trace_data , trace_data_size);

                         memcpy(data_response, ToSend, ToSendMax);

1286 modulated_response = data_response;

1287 modulated_response_size = ToSendMax;

1288 }

                 else if(receivedCmd[0] == ICLASS_CMD_PAGESEL)

1290 {//Pagesel

1291 //Pagesel enables to select a page in the selected chip memory and return its configuration block

1292 //Chips with a single page will not answer to this command

1293 // It appears we're fine ignoring this.

1294 //Otherwise, we should answer 8bytes (block) + 2bytes CRC

1295 }

1296 else {

1297 //#db# Unknown command received from reader (len=5): 26 1 0 f6 a 44 44 44 44

1298 // Never seen this command before

1299 Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x",

1300 len,

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

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

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

1304 // Do not respond

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

1306 trace_data = NULL;

1307 trace_data_size = 0;

1308 }

1309

                 if(cmdsRecvd >  100) {

1311 //DbpString("100 commands later...");

1312 //break;

1313 }

1314 else {

1315 cmdsRecvd++;

1316 }

1317 /**

1318 A legit tag has about 380us delay between reader EOT and tag SOF.

1319 **/

                 if(modulated_response_size > 0) {

                         SendIClassAnswer(modulated_response, modulated_response_size, response_delay);

1322 t2r_time = GetCountSspClk();

1323 }

1324

1325 if (tracing) {

1326 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);

1329

1330 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);

1333 }

1334 if(!tracing) {

1335 DbpString("Trace full");

1336 //break;

1337 }

1338

1339 }

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 && wait) *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] = 0xf0;

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

 bool 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 true;

1613 }

1614 }

1615 return false;//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_ext(uint8_t *card_data, bool use_credit_key)

1626 {

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

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

         static uint8_t identify[]    = { 0x0c, 0x00, 0x73, 0x33 };

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

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

1632 if (use_credit_key)

                 readcheck_cc[0] = 0x18;

1634 else

                 readcheck_cc[0] = 0x88;

1636

1637 uint8_t resp[ICLASS_BUFFER_SIZE];

1638

1639 uint8_t read_status = 0;

1640

1641 // Send act_all

         ReaderTransmitIClass(act_all, 1);

1643 // Card present?

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

1645 //Send Identify

         ReaderTransmitIClass(identify, 1);

1647 //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

1650

1651 //Copy the Anti-collision CSN to our select-packet

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

1653 //Select the card

         ReaderTransmitIClass(select, sizeof(select));

1655 //We expect a 10-byte response here, 8 byte CSN and 2 byte CRC

1656 len = ReaderReceiveIClass(resp);

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

1658

1659 //Success - level 1, we got CSN

1660 //Save CSN in response data

         memcpy(card_data,resp,8);

1662

1663 //Flag that we got to at least stage 1, read CSN

1664 read_status = 1;

1665

1666 // Card selected, now read e-purse (cc) (only 8 bytes no CRC)

         ReaderTransmitIClass(readcheck_cc, sizeof(readcheck_cc));

         if(ReaderReceiveIClass(resp) == 8) {

1669 //Save CC (e-purse) in response data

                 memcpy(card_data+8,resp,8);

1671 read_status++;

1672 }

1673

1674 return read_status;

1675 }

 uint8_t handshakeIclassTag(uint8_t *card_data) {

         return handshakeIclassTag_ext(card_data, false);

1678 }

1679

1680

1681 // Reader iClass Anticollission

 void ReaderIClass(uint8_t arg0) {

1683

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

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

         uint8_t last_csn[8]={0,0,0,0,0,0,0,0};

1687 uint8_t resp[ICLASS_BUFFER_SIZE];

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

1689 //Read conf block CRC(0x01) => 0xfa 0x22

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

1691 //Read App Issuer Area block CRC(0x05) => 0xde 0x64

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

1693

1694 int read_status= 0;

1695 uint8_t result_status = 0;

1696 // flag to read until one tag is found successfully

1697 bool abort_after_read = arg0 & FLAG_ICLASS_READER_ONLY_ONCE;

1698 // flag to only try 5 times to find one tag then return

1699 bool try_once = arg0 & FLAG_ICLASS_READER_ONE_TRY;

1700 // if neither abort_after_read nor try_once then continue reading until button pressed.

1701

1702 bool use_credit_key = arg0 & FLAG_ICLASS_READER_CEDITKEY;

1703 // test flags for what blocks to be sure to read

1704 uint8_t flagReadConfig = arg0 & FLAG_ICLASS_READER_CONF;

1705 uint8_t flagReadCC = arg0 & FLAG_ICLASS_READER_CC;

1706 uint8_t flagReadAA = arg0 & FLAG_ICLASS_READER_AA;

1707

1708 set_tracing(true);

1709 setupIclassReader();

1710

1711 uint16_t tryCnt=0;

         bool userCancelled = BUTTON_PRESS() || usb_poll_validate_length();

1713 while(!userCancelled)

1714 {

1715 // if only looking for one card try 2 times if we missed it the first time

                 if (try_once && tryCnt > 2) break; 

1717 tryCnt++;

1718 if(!tracing) {

1719 DbpString("Trace full");

1720 break;

1721 }

1722 WDT_HIT();

1723

                 read_status = handshakeIclassTag_ext(card_data, use_credit_key);

1725

                 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;

1729

1730 // handshakeIclass returns CSN|CC, but the actual block

1731 // layout is CSN|CONFIG|CC, so here we reorder the data,

1732 // moving CC forward 8 bytes

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

1734 //Read block 1, config

1735 if(flagReadConfig) {

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

1737 {

1738 result_status |= FLAG_ICLASS_READER_CONF;

                                 memcpy(card_data+8, resp, 8);

1740 } else {

1741 Dbprintf("Failed to dump config block");

1742 }

1743 }

1744

1745 //Read block 5, AA

1746 if(flagReadAA) {

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

1748 {

1749 result_status |= FLAG_ICLASS_READER_AA;

                                 memcpy(card_data+(8*5), resp, 8);

1751 } else {

1752 //Dbprintf("Failed to dump AA block");

1753 }

1754 }

1755

1756 // 0 : CSN

1757 // 1 : Configuration

1758 // 2 : e-purse

1759 // (3,4 write-only, kc and kd)

1760 // 5 Application issuer area

1761 //

1762 //Then we can 'ship' back the 8 * 6 bytes of data,

1763 // with 0xFF:s in block 3 and 4.

1764

1765 LED_B_ON();

1766 //Send back to client, but don't bother if we already sent this -

1767 // only useful if looping in arm (not try_once && not abort_after_read)

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

1769 {

1770 // If caller requires that we get Conf, CC, AA, continue until we got it

                         if( (result_status ^ FLAG_ICLASS_READER_CSN ^ flagReadConfig ^ flagReadCC ^ flagReadAA) == 0) {

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

1773 if(abort_after_read) {

1774 LED_A_OFF();

1775 LED_B_OFF();

1776 return;

1777 }

1778 //Save that we already sent this....

                                 memcpy(last_csn, card_data, 8);

1780 }

1781

1782 }

1783 LED_B_OFF();

                 userCancelled = BUTTON_PRESS() || usb_poll_validate_length();

1785 }

1786 if (userCancelled) {

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

1788 } else {

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

1790 }

1791 LED_A_OFF();

1792 }

1793

 void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {

1795

         uint8_t card_data[USB_CMD_DATA_SIZE]={0};

         uint16_t block_crc_LUT[255] = {0};

1798

1799 {//Generate a lookup table for block crc

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

1801 char bl = block;

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

1803 }

1804 }

1805 //Dbprintf("Lookup table: %02x %02x %02x" ,block_crc_LUT[0],block_crc_LUT[1],block_crc_LUT[2]);

1806

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

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

1809

1810 uint16_t crc = 0;

1811 uint8_t cardsize=0;

1812 uint8_t mem=0;

1813

1814 static struct memory_t{

1815 int k16;

1816 int book;

1817 int k2;

1818 int lockauth;

1819 int keyaccess;

1820 } memory;

1821

1822 uint8_t resp[ICLASS_BUFFER_SIZE];

1823

1824 setupIclassReader();

1825 set_tracing(TRUE);

1826

1827 while(!BUTTON_PRESS()) {

1828

1829 WDT_HIT();

1830

1831 if(!tracing) {

1832 DbpString("Trace full");

1833 break;

1834 }

1835

                 uint8_t read_status = handshakeIclassTag(card_data);

                 if(read_status < 2) continue;

1838

1839 //for now replay captured auth (as cc not updated)

                 memcpy(check+5,MAC,4);

1841

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

1843 {

1844 Dbprintf("Error: Authentication Fail!");

1845 continue;

1846 }

1847

1848 //first get configuration block (block 1)

1849 crc = block_crc_LUT[1];

                 read[1]=1;

                 read[2] = crc >> 8;

                 read[3] = crc & 0xff;

1853

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

1855 {

1856 Dbprintf("Dump config (block 1) failed");

1857 continue;

1858 }

1859

1860 mem=resp[5];

                 memory.k16= (mem & 0x80);

                 memory.book= (mem & 0x20);

                 memory.k2= (mem & 0x8);

                 memory.lockauth= (mem & 0x2);

                 memory.keyaccess= (mem & 0x1);

1866

                 cardsize = memory.k16 ? 255 : 32;

1868 WDT_HIT();

1869 //Set card_data to all zeroes, we'll fill it with data

                 memset(card_data,0x0,USB_CMD_DATA_SIZE);

1871 uint8_t failedRead =0;

1872 uint32_t stored_data_length =0;

1873 //then loop around remaining blocks

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

1875

1876 read[1]= block;

1877 crc = block_crc_LUT[block];

                         read[2] = crc >> 8;

                         read[3] = crc & 0xff;

1880

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

1882 {

1883 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]);

1887

1888 //Fill up the buffer

                                 memcpy(card_data+stored_data_length,resp,8);

1890 stored_data_length += 8;

                                 if(stored_data_length +8 > USB_CMD_DATA_SIZE)

1892 {//Time to send this off and start afresh

1893 cmd_send(CMD_ACK,

1894 stored_data_length,//data length

1895 failedRead,//Failed blocks?

1896 0,//Not used ATM

1897 card_data, stored_data_length);

1898 //reset

1899 stored_data_length = 0;

1900 failedRead = 0;

1901 }

1902

1903 }else{

1904 failedRead = 1;

1905 stored_data_length +=8;//Otherwise, data becomes misaligned

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

1907 }

1908 }

1909

1910 //Send off any remaining data

                 if(stored_data_length > 0)

1912 {

1913 cmd_send(CMD_ACK,

1914 stored_data_length,//data length

1915 failedRead,//Failed blocks?

1916 0,//Not used ATM

1917 card_data, stored_data_length);

1918 }

1919 //If we got here, let's break

1920 break;

1921 }

1922 //Signal end of transmission

1923 cmd_send(CMD_ACK,

1924 0,//data length

1925 0,//Failed blocks?

1926 0,//Not used ATM

1927 card_data, 0);

1928

1929 LED_A_OFF();

1930 }

1931

 void iClass_ReadCheck(uint8_t   blockNo, uint8_t keyType) {

1933 uint8_t readcheck[] = { keyType, blockNo };

         uint8_t resp[] = {0,0,0,0,0,0,0,0};

1935 size_t isOK = 0;

         isOK = sendCmdGetResponseWithRetries(readcheck, sizeof(readcheck), resp, sizeof(resp), 6);

         cmd_send(CMD_ACK,isOK,0,0,0,0);

1938 }

1939

 void iClass_Authentication(uint8_t *MAC) {

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

1942 uint8_t resp[ICLASS_BUFFER_SIZE];

         memcpy(check+5,MAC,4);

1944 bool isOK;

         isOK = sendCmdGetResponseWithRetries(check, sizeof(check), resp, 4, 6);

         cmd_send(CMD_ACK,isOK,0,0,0,0);

1947 }

 bool iClass_ReadBlock(uint8_t blockNo, uint8_t *readdata) {

         uint8_t readcmd[] = {ICLASS_CMD_READ_OR_IDENTIFY, blockNo, 0x00, 0x00}; //0x88, 0x00 // can i use 0C?

1950 char bl = blockNo;

         uint16_t rdCrc = iclass_crc16(&bl, 1);

         readcmd[2] = rdCrc >> 8;

         readcmd[3] = rdCrc & 0xff;

         uint8_t resp[] = {0,0,0,0,0,0,0,0,0,0};

1955 bool isOK = false;

1956

1957 //readcmd[1] = blockNo;

         isOK = sendCmdGetResponseWithRetries(readcmd, sizeof(readcmd), resp, 10, 10);

         memcpy(readdata, resp, sizeof(resp));

1960

1961 return isOK;

1962 }

1963

 void iClass_ReadBlk(uint8_t blockno) {

         uint8_t readblockdata[] = {0,0,0,0,0,0,0,0,0,0};

1966 bool isOK = false;

         isOK = iClass_ReadBlock(blockno, readblockdata);

         cmd_send(CMD_ACK, isOK, 0, 0, readblockdata, 8);

1969 }

1970

 void iClass_Dump(uint8_t blockno, uint8_t numblks) {

         uint8_t readblockdata[] = {0,0,0,0,0,0,0,0,0,0};

1973 bool isOK = false;

1974 uint8_t blkCnt = 0;

1975

1976 BigBuf_free();

         uint8_t *dataout = BigBuf_malloc(255*8);

1978 if (dataout == NULL){

1979 Dbprintf("out of memory");

1980 OnError(1);

1981 return;

1982 }

         memset(dataout,0xFF,255*8);

1984

         for (;blkCnt < numblks; blkCnt++) {

                 isOK = iClass_ReadBlock(blockno+blkCnt, readblockdata);

                 if (!isOK || (readblockdata[0] == 0xBB || readblockdata[7] == 0xBB || readblockdata[2] == 0xBB)) { //try again

                         isOK = iClass_ReadBlock(blockno+blkCnt, readblockdata);

1989 if (!isOK) {

                                 Dbprintf("Block %02X failed to read", blkCnt+blockno);

1991 break;

1992 }

1993 }

                 memcpy(dataout+(blkCnt*8),readblockdata,8);

1995 }

1996 //return pointer to dump memory in arg3

         cmd_send(CMD_ACK,isOK,blkCnt,BigBuf_max_traceLen(),0,0);

1998 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

1999 LEDsoff();

2000 BigBuf_free();

2001 }

2002

 bool iClass_WriteBlock_ext(uint8_t blockNo, uint8_t *data) {

         uint8_t write[] = { ICLASS_CMD_UPDATE, blockNo, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

2005 //uint8_t readblockdata[10];

2006 //write[1] = blockNo;

         memcpy(write+2, data, 12); // data + mac

         char *wrCmd = (char *)(write+1); 

         uint16_t wrCrc = iclass_crc16(wrCmd, 13);

         write[14] = wrCrc >> 8;

         write[15] = wrCrc & 0xff;

         uint8_t resp[] = {0,0,0,0,0,0,0,0,0,0};

2013 bool isOK = false;

2014

         isOK = sendCmdGetResponseWithRetries(write,sizeof(write),resp,sizeof(resp),10);

2016 if (isOK) { //if reader responded correctly

2017 //Dbprintf("WriteResp: %02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",resp[0],resp[1],resp[2],resp[3],resp[4],resp[5],resp[6],resp[7],resp[8],resp[9]);

                 if (memcmp(write+2,resp,8)) {  //if response is not equal to write values

                         if (blockNo != 3 && blockNo != 4) { //if not programming key areas (note key blocks don't get programmed with actual key data it is xor data)

2020 //error try again

                                 isOK = sendCmdGetResponseWithRetries(write,sizeof(write),resp,sizeof(resp),10);

2022 }

2023

2024 }

2025 }

2026 return isOK;

2027 }

2028

 void iClass_WriteBlock(uint8_t blockNo, uint8_t *data) {

         bool isOK = iClass_WriteBlock_ext(blockNo, data);

2031 if (isOK){

                 Dbprintf("Write block [%02x] successful",blockNo);

2033 } else {

                 Dbprintf("Write block [%02x] failed",blockNo);          

2035 }

         cmd_send(CMD_ACK,isOK,0,0,0,0); 

2037 }

2038

 void iClass_Clone(uint8_t startblock, uint8_t endblock, uint8_t *data) {

2040 int i;

2041 int written = 0;

         int total_block = (endblock - startblock) + 1;

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

2044 // block number

                 if (iClass_WriteBlock_ext(i+startblock, data+(i*12))){

                         Dbprintf("Write block [%02x] successful",i + startblock);

2047 written++;

2048 } else {

                         if (iClass_WriteBlock_ext(i+startblock, data+(i*12))){

                                 Dbprintf("Write block [%02x] successful",i + startblock);

2051 written++;

2052 } else {

                                 Dbprintf("Write block [%02x] failed",i + startblock);

2054 }

2055 }

2056 }

2057 if (written == total_block)

2058 Dbprintf("Clone complete");

2059 else

2060 Dbprintf("Clone incomplete");

2061

         cmd_send(CMD_ACK,1,0,0,0,0);

2063 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

2064 LEDsoff();

2065 }