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1 //-----------------------------------------------------------------------------
2 // Merlok - June 2011, 2012
3 // Gerhard de Koning Gans - May 2008
4 // Hagen Fritsch - June 2010
5 //
6 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
7 // at your option, any later version. See the LICENSE.txt file for the text of
8 // the license.
9 //-----------------------------------------------------------------------------
10 // Routines to support ISO 14443 type A.
11 //-----------------------------------------------------------------------------
12
13 #include "proxmark3.h"
14 #include "apps.h"
15 #include "util.h"
16 #include "string.h"
17 #include "cmd.h"
18
19 #include "iso14443crc.h"
20 #include "iso14443a.h"
21 #include "crapto1.h"
22 #include "mifareutil.h"
23
24 static uint32_t iso14a_timeout;
25 uint8_t *trace = (uint8_t *) BigBuf+TRACE_OFFSET;
26 int traceLen = 0;
27 int rsamples = 0;
28 int tracing = TRUE;
29 uint8_t trigger = 0;
30 // the block number for the ISO14443-4 PCB
31 static uint8_t iso14_pcb_blocknum = 0;
32
33 // CARD TO READER - manchester
34 // Sequence D: 11110000 modulation with subcarrier during first half
35 // Sequence E: 00001111 modulation with subcarrier during second half
36 // Sequence F: 00000000 no modulation with subcarrier
37 // READER TO CARD - miller
38 // Sequence X: 00001100 drop after half a period
39 // Sequence Y: 00000000 no drop
40 // Sequence Z: 11000000 drop at start
41 #define SEC_D 0xf0
42 #define SEC_E 0x0f
43 #define SEC_F 0x00
44 #define SEC_X 0x0c
45 #define SEC_Y 0x00
46 #define SEC_Z 0xc0
47
48 const uint8_t OddByteParity[256] = {
49 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
50 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
51 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
52 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
53 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
54 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
55 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
56 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
57 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
58 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
59 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
60 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
61 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
62 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
63 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
64 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1
65 };
66
67
68 void iso14a_set_trigger(bool enable) {
69 trigger = enable;
70 }
71
72 void iso14a_clear_trace() {
73 memset(trace, 0x44, TRACE_SIZE);
74 traceLen = 0;
75 }
76
77 void iso14a_set_tracing(bool enable) {
78 tracing = enable;
79 }
80
81 void iso14a_set_timeout(uint32_t timeout) {
82 iso14a_timeout = timeout;
83 }
84
85 //-----------------------------------------------------------------------------
86 // Generate the parity value for a byte sequence
87 //
88 //-----------------------------------------------------------------------------
89 byte_t oddparity (const byte_t bt)
90 {
91 return OddByteParity[bt];
92 }
93
94 uint32_t GetParity(const uint8_t * pbtCmd, int iLen)
95 {
96 int i;
97 uint32_t dwPar = 0;
98
99 // Generate the encrypted data
100 for (i = 0; i < iLen; i++) {
101 // Save the encrypted parity bit
102 dwPar |= ((OddByteParity[pbtCmd[i]]) << i);
103 }
104 return dwPar;
105 }
106
107 void AppendCrc14443a(uint8_t* data, int len)
108 {
109 ComputeCrc14443(CRC_14443_A,data,len,data+len,data+len+1);
110 }
111
112 // The function LogTrace() is also used by the iClass implementation in iClass.c
113 int RAMFUNC LogTrace(const uint8_t * btBytes, int iLen, int iSamples, uint32_t dwParity, int bReader)
114 {
115 // Return when trace is full
116 if (traceLen >= TRACE_SIZE) return FALSE;
117
118 // Trace the random, i'm curious
119 rsamples += iSamples;
120 trace[traceLen++] = ((rsamples >> 0) & 0xff);
121 trace[traceLen++] = ((rsamples >> 8) & 0xff);
122 trace[traceLen++] = ((rsamples >> 16) & 0xff);
123 trace[traceLen++] = ((rsamples >> 24) & 0xff);
124 if (!bReader) {
125 trace[traceLen - 1] |= 0x80;
126 }
127 trace[traceLen++] = ((dwParity >> 0) & 0xff);
128 trace[traceLen++] = ((dwParity >> 8) & 0xff);
129 trace[traceLen++] = ((dwParity >> 16) & 0xff);
130 trace[traceLen++] = ((dwParity >> 24) & 0xff);
131 trace[traceLen++] = iLen;
132 memcpy(trace + traceLen, btBytes, iLen);
133 traceLen += iLen;
134 return TRUE;
135 }
136
137 //-----------------------------------------------------------------------------
138 // The software UART that receives commands from the reader, and its state
139 // variables.
140 //-----------------------------------------------------------------------------
141 static tUart Uart;
142
143 static RAMFUNC int MillerDecoding(int bit)
144 {
145 //int error = 0;
146 int bitright;
147
148 if(!Uart.bitBuffer) {
149 Uart.bitBuffer = bit ^ 0xFF0;
150 return FALSE;
151 }
152 else {
153 Uart.bitBuffer <<= 4;
154 Uart.bitBuffer ^= bit;
155 }
156
157 int EOC = FALSE;
158
159 if(Uart.state != STATE_UNSYNCD) {
160 Uart.posCnt++;
161
162 if((Uart.bitBuffer & Uart.syncBit) ^ Uart.syncBit) {
163 bit = 0x00;
164 }
165 else {
166 bit = 0x01;
167 }
168 if(((Uart.bitBuffer << 1) & Uart.syncBit) ^ Uart.syncBit) {
169 bitright = 0x00;
170 }
171 else {
172 bitright = 0x01;
173 }
174 if(bit != bitright) { bit = bitright; }
175
176 if(Uart.posCnt == 1) {
177 // measurement first half bitperiod
178 if(!bit) {
179 Uart.drop = DROP_FIRST_HALF;
180 }
181 }
182 else {
183 // measurement second half bitperiod
184 if(!bit & (Uart.drop == DROP_NONE)) {
185 Uart.drop = DROP_SECOND_HALF;
186 }
187 else if(!bit) {
188 // measured a drop in first and second half
189 // which should not be possible
190 Uart.state = STATE_ERROR_WAIT;
191 //error = 0x01;
192 }
193
194 Uart.posCnt = 0;
195
196 switch(Uart.state) {
197 case STATE_START_OF_COMMUNICATION:
198 Uart.shiftReg = 0;
199 if(Uart.drop == DROP_SECOND_HALF) {
200 // error, should not happen in SOC
201 Uart.state = STATE_ERROR_WAIT;
202 //error = 0x02;
203 }
204 else {
205 // correct SOC
206 Uart.state = STATE_MILLER_Z;
207 }
208 break;
209
210 case STATE_MILLER_Z:
211 Uart.bitCnt++;
212 Uart.shiftReg >>= 1;
213 if(Uart.drop == DROP_NONE) {
214 // logic '0' followed by sequence Y
215 // end of communication
216 Uart.state = STATE_UNSYNCD;
217 EOC = TRUE;
218 }
219 // if(Uart.drop == DROP_FIRST_HALF) {
220 // Uart.state = STATE_MILLER_Z; stay the same
221 // we see a logic '0' }
222 if(Uart.drop == DROP_SECOND_HALF) {
223 // we see a logic '1'
224 Uart.shiftReg |= 0x100;
225 Uart.state = STATE_MILLER_X;
226 }
227 break;
228
229 case STATE_MILLER_X:
230 Uart.shiftReg >>= 1;
231 if(Uart.drop == DROP_NONE) {
232 // sequence Y, we see a '0'
233 Uart.state = STATE_MILLER_Y;
234 Uart.bitCnt++;
235 }
236 if(Uart.drop == DROP_FIRST_HALF) {
237 // Would be STATE_MILLER_Z
238 // but Z does not follow X, so error
239 Uart.state = STATE_ERROR_WAIT;
240 //error = 0x03;
241 }
242 if(Uart.drop == DROP_SECOND_HALF) {
243 // We see a '1' and stay in state X
244 Uart.shiftReg |= 0x100;
245 Uart.bitCnt++;
246 }
247 break;
248
249 case STATE_MILLER_Y:
250 Uart.bitCnt++;
251 Uart.shiftReg >>= 1;
252 if(Uart.drop == DROP_NONE) {
253 // logic '0' followed by sequence Y
254 // end of communication
255 Uart.state = STATE_UNSYNCD;
256 EOC = TRUE;
257 }
258 if(Uart.drop == DROP_FIRST_HALF) {
259 // we see a '0'
260 Uart.state = STATE_MILLER_Z;
261 }
262 if(Uart.drop == DROP_SECOND_HALF) {
263 // We see a '1' and go to state X
264 Uart.shiftReg |= 0x100;
265 Uart.state = STATE_MILLER_X;
266 }
267 break;
268
269 case STATE_ERROR_WAIT:
270 // That went wrong. Now wait for at least two bit periods
271 // and try to sync again
272 if(Uart.drop == DROP_NONE) {
273 Uart.highCnt = 6;
274 Uart.state = STATE_UNSYNCD;
275 }
276 break;
277
278 default:
279 Uart.state = STATE_UNSYNCD;
280 Uart.highCnt = 0;
281 break;
282 }
283
284 Uart.drop = DROP_NONE;
285
286 // should have received at least one whole byte...
287 if((Uart.bitCnt == 2) && EOC && (Uart.byteCnt > 0)) {
288 return TRUE;
289 }
290
291 if(Uart.bitCnt == 9) {
292 Uart.output[Uart.byteCnt] = (Uart.shiftReg & 0xff);
293 Uart.byteCnt++;
294
295 Uart.parityBits <<= 1;
296 Uart.parityBits ^= ((Uart.shiftReg >> 8) & 0x01);
297
298 if(EOC) {
299 // when End of Communication received and
300 // all data bits processed..
301 return TRUE;
302 }
303 Uart.bitCnt = 0;
304 }
305
306 /*if(error) {
307 Uart.output[Uart.byteCnt] = 0xAA;
308 Uart.byteCnt++;
309 Uart.output[Uart.byteCnt] = error & 0xFF;
310 Uart.byteCnt++;
311 Uart.output[Uart.byteCnt] = 0xAA;
312 Uart.byteCnt++;
313 Uart.output[Uart.byteCnt] = (Uart.bitBuffer >> 8) & 0xFF;
314 Uart.byteCnt++;
315 Uart.output[Uart.byteCnt] = Uart.bitBuffer & 0xFF;
316 Uart.byteCnt++;
317 Uart.output[Uart.byteCnt] = (Uart.syncBit >> 3) & 0xFF;
318 Uart.byteCnt++;
319 Uart.output[Uart.byteCnt] = 0xAA;
320 Uart.byteCnt++;
321 return TRUE;
322 }*/
323 }
324
325 }
326 else {
327 bit = Uart.bitBuffer & 0xf0;
328 bit >>= 4;
329 bit ^= 0x0F;
330 if(bit) {
331 // should have been high or at least (4 * 128) / fc
332 // according to ISO this should be at least (9 * 128 + 20) / fc
333 if(Uart.highCnt == 8) {
334 // we went low, so this could be start of communication
335 // it turns out to be safer to choose a less significant
336 // syncbit... so we check whether the neighbour also represents the drop
337 Uart.posCnt = 1; // apparently we are busy with our first half bit period
338 Uart.syncBit = bit & 8;
339 Uart.samples = 3;
340 if(!Uart.syncBit) { Uart.syncBit = bit & 4; Uart.samples = 2; }
341 else if(bit & 4) { Uart.syncBit = bit & 4; Uart.samples = 2; bit <<= 2; }
342 if(!Uart.syncBit) { Uart.syncBit = bit & 2; Uart.samples = 1; }
343 else if(bit & 2) { Uart.syncBit = bit & 2; Uart.samples = 1; bit <<= 1; }
344 if(!Uart.syncBit) { Uart.syncBit = bit & 1; Uart.samples = 0;
345 if(Uart.syncBit && (Uart.bitBuffer & 8)) {
346 Uart.syncBit = 8;
347
348 // the first half bit period is expected in next sample
349 Uart.posCnt = 0;
350 Uart.samples = 3;
351 }
352 }
353 else if(bit & 1) { Uart.syncBit = bit & 1; Uart.samples = 0; }
354
355 Uart.syncBit <<= 4;
356 Uart.state = STATE_START_OF_COMMUNICATION;
357 Uart.drop = DROP_FIRST_HALF;
358 Uart.bitCnt = 0;
359 Uart.byteCnt = 0;
360 Uart.parityBits = 0;
361 //error = 0;
362 }
363 else {
364 Uart.highCnt = 0;
365 }
366 }
367 else {
368 if(Uart.highCnt < 8) {
369 Uart.highCnt++;
370 }
371 }
372 }
373
374 return FALSE;
375 }
376
377 //=============================================================================
378 // ISO 14443 Type A - Manchester
379 //=============================================================================
380 static tDemod Demod;
381
382 static RAMFUNC int ManchesterDecoding(int v)
383 {
384 int bit;
385 int modulation;
386 //int error = 0;
387
388 if(!Demod.buff) {
389 Demod.buff = 1;
390 Demod.buffer = v;
391 return FALSE;
392 }
393 else {
394 bit = Demod.buffer;
395 Demod.buffer = v;
396 }
397
398 if(Demod.state==DEMOD_UNSYNCD) {
399 Demod.output[Demod.len] = 0xfa;
400 Demod.syncBit = 0;
401 //Demod.samples = 0;
402 Demod.posCount = 1; // This is the first half bit period, so after syncing handle the second part
403
404 if(bit & 0x08) {
405 Demod.syncBit = 0x08;
406 }
407
408 if(bit & 0x04) {
409 if(Demod.syncBit) {
410 bit <<= 4;
411 }
412 Demod.syncBit = 0x04;
413 }
414
415 if(bit & 0x02) {
416 if(Demod.syncBit) {
417 bit <<= 2;
418 }
419 Demod.syncBit = 0x02;
420 }
421
422 if(bit & 0x01 && Demod.syncBit) {
423 Demod.syncBit = 0x01;
424 }
425
426 if(Demod.syncBit) {
427 Demod.len = 0;
428 Demod.state = DEMOD_START_OF_COMMUNICATION;
429 Demod.sub = SUB_FIRST_HALF;
430 Demod.bitCount = 0;
431 Demod.shiftReg = 0;
432 Demod.parityBits = 0;
433 Demod.samples = 0;
434 if(Demod.posCount) {
435 if(trigger) LED_A_OFF();
436 switch(Demod.syncBit) {
437 case 0x08: Demod.samples = 3; break;
438 case 0x04: Demod.samples = 2; break;
439 case 0x02: Demod.samples = 1; break;
440 case 0x01: Demod.samples = 0; break;
441 }
442 }
443 //error = 0;
444 }
445 }
446 else {
447 //modulation = bit & Demod.syncBit;
448 modulation = ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
449
450 Demod.samples += 4;
451
452 if(Demod.posCount==0) {
453 Demod.posCount = 1;
454 if(modulation) {
455 Demod.sub = SUB_FIRST_HALF;
456 }
457 else {
458 Demod.sub = SUB_NONE;
459 }
460 }
461 else {
462 Demod.posCount = 0;
463 if(modulation && (Demod.sub == SUB_FIRST_HALF)) {
464 if(Demod.state!=DEMOD_ERROR_WAIT) {
465 Demod.state = DEMOD_ERROR_WAIT;
466 Demod.output[Demod.len] = 0xaa;
467 //error = 0x01;
468 }
469 }
470 else if(modulation) {
471 Demod.sub = SUB_SECOND_HALF;
472 }
473
474 switch(Demod.state) {
475 case DEMOD_START_OF_COMMUNICATION:
476 if(Demod.sub == SUB_FIRST_HALF) {
477 Demod.state = DEMOD_MANCHESTER_D;
478 }
479 else {
480 Demod.output[Demod.len] = 0xab;
481 Demod.state = DEMOD_ERROR_WAIT;
482 //error = 0x02;
483 }
484 break;
485
486 case DEMOD_MANCHESTER_D:
487 case DEMOD_MANCHESTER_E:
488 if(Demod.sub == SUB_FIRST_HALF) {
489 Demod.bitCount++;
490 Demod.shiftReg = (Demod.shiftReg >> 1) ^ 0x100;
491 Demod.state = DEMOD_MANCHESTER_D;
492 }
493 else if(Demod.sub == SUB_SECOND_HALF) {
494 Demod.bitCount++;
495 Demod.shiftReg >>= 1;
496 Demod.state = DEMOD_MANCHESTER_E;
497 }
498 else {
499 Demod.state = DEMOD_MANCHESTER_F;
500 }
501 break;
502
503 case DEMOD_MANCHESTER_F:
504 // Tag response does not need to be a complete byte!
505 if(Demod.len > 0 || Demod.bitCount > 0) {
506 if(Demod.bitCount > 0) {
507 Demod.shiftReg >>= (9 - Demod.bitCount);
508 Demod.output[Demod.len] = Demod.shiftReg & 0xff;
509 Demod.len++;
510 // No parity bit, so just shift a 0
511 Demod.parityBits <<= 1;
512 }
513
514 Demod.state = DEMOD_UNSYNCD;
515 return TRUE;
516 }
517 else {
518 Demod.output[Demod.len] = 0xad;
519 Demod.state = DEMOD_ERROR_WAIT;
520 //error = 0x03;
521 }
522 break;
523
524 case DEMOD_ERROR_WAIT:
525 Demod.state = DEMOD_UNSYNCD;
526 break;
527
528 default:
529 Demod.output[Demod.len] = 0xdd;
530 Demod.state = DEMOD_UNSYNCD;
531 break;
532 }
533
534 if(Demod.bitCount>=9) {
535 Demod.output[Demod.len] = Demod.shiftReg & 0xff;
536 Demod.len++;
537
538 Demod.parityBits <<= 1;
539 Demod.parityBits ^= ((Demod.shiftReg >> 8) & 0x01);
540
541 Demod.bitCount = 0;
542 Demod.shiftReg = 0;
543 }
544
545 /*if(error) {
546 Demod.output[Demod.len] = 0xBB;
547 Demod.len++;
548 Demod.output[Demod.len] = error & 0xFF;
549 Demod.len++;
550 Demod.output[Demod.len] = 0xBB;
551 Demod.len++;
552 Demod.output[Demod.len] = bit & 0xFF;
553 Demod.len++;
554 Demod.output[Demod.len] = Demod.buffer & 0xFF;
555 Demod.len++;
556 Demod.output[Demod.len] = Demod.syncBit & 0xFF;
557 Demod.len++;
558 Demod.output[Demod.len] = 0xBB;
559 Demod.len++;
560 return TRUE;
561 }*/
562
563 }
564
565 } // end (state != UNSYNCED)
566
567 return FALSE;
568 }
569
570 //=============================================================================
571 // Finally, a `sniffer' for ISO 14443 Type A
572 // Both sides of communication!
573 //=============================================================================
574
575 //-----------------------------------------------------------------------------
576 // Record the sequence of commands sent by the reader to the tag, with
577 // triggering so that we start recording at the point that the tag is moved
578 // near the reader.
579 //-----------------------------------------------------------------------------
580 void RAMFUNC SnoopIso14443a(uint8_t param) {
581 // param:
582 // bit 0 - trigger from first card answer
583 // bit 1 - trigger from first reader 7-bit request
584
585 LEDsoff();
586 // init trace buffer
587 iso14a_clear_trace();
588
589 // We won't start recording the frames that we acquire until we trigger;
590 // a good trigger condition to get started is probably when we see a
591 // response from the tag.
592 // triggered == FALSE -- to wait first for card
593 int triggered = !(param & 0x03);
594
595 // The command (reader -> tag) that we're receiving.
596 // The length of a received command will in most cases be no more than 18 bytes.
597 // So 32 should be enough!
598 uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
599 // The response (tag -> reader) that we're receiving.
600 uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET);
601
602 // As we receive stuff, we copy it from receivedCmd or receivedResponse
603 // into trace, along with its length and other annotations.
604 //uint8_t *trace = (uint8_t *)BigBuf;
605
606 // The DMA buffer, used to stream samples from the FPGA
607 int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
608 int8_t *data = dmaBuf;
609 int maxDataLen = 0;
610 int dataLen = 0;
611
612 // Set up the demodulator for tag -> reader responses.
613 Demod.output = receivedResponse;
614 Demod.len = 0;
615 Demod.state = DEMOD_UNSYNCD;
616
617 // Set up the demodulator for the reader -> tag commands
618 memset(&Uart, 0, sizeof(Uart));
619 Uart.output = receivedCmd;
620 Uart.byteCntMax = 32; // was 100 (greg)//////////////////
621 Uart.state = STATE_UNSYNCD;
622
623 // Setup for the DMA.
624 FpgaSetupSsc();
625 FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
626
627 // And put the FPGA in the appropriate mode
628 // Signal field is off with the appropriate LED
629 LED_D_OFF();
630 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
631 SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
632
633 // Count of samples received so far, so that we can include timing
634 // information in the trace buffer.
635 rsamples = 0;
636 // And now we loop, receiving samples.
637 while(true) {
638 if(BUTTON_PRESS()) {
639 DbpString("cancelled by button");
640 goto done;
641 }
642
643 LED_A_ON();
644 WDT_HIT();
645
646 int register readBufDataP = data - dmaBuf;
647 int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR;
648 if (readBufDataP <= dmaBufDataP){
649 dataLen = dmaBufDataP - readBufDataP;
650 } else {
651 dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP + 1;
652 }
653 // test for length of buffer
654 if(dataLen > maxDataLen) {
655 maxDataLen = dataLen;
656 if(dataLen > 400) {
657 Dbprintf("blew circular buffer! dataLen=0x%x", dataLen);
658 goto done;
659 }
660 }
661 if(dataLen < 1) continue;
662
663 // primary buffer was stopped( <-- we lost data!
664 if (!AT91C_BASE_PDC_SSC->PDC_RCR) {
665 AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf;
666 AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE;
667 }
668 // secondary buffer sets as primary, secondary buffer was stopped
669 if (!AT91C_BASE_PDC_SSC->PDC_RNCR) {
670 AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
671 AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
672 }
673
674 LED_A_OFF();
675
676 rsamples += 4;
677 if(MillerDecoding((data[0] & 0xF0) >> 4)) {
678 LED_C_ON();
679
680 // check - if there is a short 7bit request from reader
681 if ((!triggered) && (param & 0x02) && (Uart.byteCnt == 1) && (Uart.bitCnt = 9)) triggered = TRUE;
682
683 if(triggered) {
684 if (!LogTrace(receivedCmd, Uart.byteCnt, 0 - Uart.samples, Uart.parityBits, TRUE)) break;
685 }
686 /* And ready to receive another command. */
687 Uart.state = STATE_UNSYNCD;
688 /* And also reset the demod code, which might have been */
689 /* false-triggered by the commands from the reader. */
690 Demod.state = DEMOD_UNSYNCD;
691 LED_B_OFF();
692 }
693
694 if(ManchesterDecoding(data[0] & 0x0F)) {
695 LED_B_ON();
696
697 if (!LogTrace(receivedResponse, Demod.len, 0 - Demod.samples, Demod.parityBits, FALSE)) break;
698
699 if ((!triggered) && (param & 0x01)) triggered = TRUE;
700
701 // And ready to receive another response.
702 memset(&Demod, 0, sizeof(Demod));
703 Demod.output = receivedResponse;
704 Demod.state = DEMOD_UNSYNCD;
705 LED_C_OFF();
706 }
707
708 data++;
709 if(data > dmaBuf + DMA_BUFFER_SIZE) {
710 data = dmaBuf;
711 }
712 } // main cycle
713
714 DbpString("COMMAND FINISHED");
715
716 done:
717 AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
718 Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.byteCnt=%x", maxDataLen, Uart.state, Uart.byteCnt);
719 Dbprintf("Uart.byteCntMax=%x, traceLen=%x, Uart.output[0]=%08x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
720 LEDsoff();
721 }
722
723 //-----------------------------------------------------------------------------
724 // Prepare tag messages
725 //-----------------------------------------------------------------------------
726 static void CodeIso14443aAsTagPar(const uint8_t *cmd, int len, uint32_t dwParity)
727 {
728 int i;
729
730 ToSendReset();
731
732 // Correction bit, might be removed when not needed
733 ToSendStuffBit(0);
734 ToSendStuffBit(0);
735 ToSendStuffBit(0);
736 ToSendStuffBit(0);
737 ToSendStuffBit(1); // 1
738 ToSendStuffBit(0);
739 ToSendStuffBit(0);
740 ToSendStuffBit(0);
741
742 // Send startbit
743 ToSend[++ToSendMax] = SEC_D;
744
745 for(i = 0; i < len; i++) {
746 int j;
747 uint8_t b = cmd[i];
748
749 // Data bits
750 for(j = 0; j < 8; j++) {
751 if(b & 1) {
752 ToSend[++ToSendMax] = SEC_D;
753 } else {
754 ToSend[++ToSendMax] = SEC_E;
755 }
756 b >>= 1;
757 }
758
759 // Get the parity bit
760 if ((dwParity >> i) & 0x01) {
761 ToSend[++ToSendMax] = SEC_D;
762 } else {
763 ToSend[++ToSendMax] = SEC_E;
764 }
765 }
766
767 // Send stopbit
768 ToSend[++ToSendMax] = SEC_F;
769
770 // Convert from last byte pos to length
771 ToSendMax++;
772 }
773
774 static void CodeIso14443aAsTag(const uint8_t *cmd, int len){
775 CodeIso14443aAsTagPar(cmd, len, GetParity(cmd, len));
776 }
777
778 //-----------------------------------------------------------------------------
779 // This is to send a NACK kind of answer, its only 3 bits, I know it should be 4
780 //-----------------------------------------------------------------------------
781 static void CodeStrangeAnswerAsTag()
782 {
783 int i;
784
785 ToSendReset();
786
787 // Correction bit, might be removed when not needed
788 ToSendStuffBit(0);
789 ToSendStuffBit(0);
790 ToSendStuffBit(0);
791 ToSendStuffBit(0);
792 ToSendStuffBit(1); // 1
793 ToSendStuffBit(0);
794 ToSendStuffBit(0);
795 ToSendStuffBit(0);
796
797 // Send startbit
798 ToSend[++ToSendMax] = SEC_D;
799
800 // 0
801 ToSend[++ToSendMax] = SEC_E;
802
803 // 0
804 ToSend[++ToSendMax] = SEC_E;
805
806 // 1
807 ToSend[++ToSendMax] = SEC_D;
808
809 // Send stopbit
810 ToSend[++ToSendMax] = SEC_F;
811
812 // Flush the buffer in FPGA!!
813 for(i = 0; i < 5; i++) {
814 ToSend[++ToSendMax] = SEC_F;
815 }
816
817 // Convert from last byte pos to length
818 ToSendMax++;
819 }
820
821 static void Code4bitAnswerAsTag(uint8_t cmd)
822 {
823 int i;
824
825 ToSendReset();
826
827 // Correction bit, might be removed when not needed
828 ToSendStuffBit(0);
829 ToSendStuffBit(0);
830 ToSendStuffBit(0);
831 ToSendStuffBit(0);
832 ToSendStuffBit(1); // 1
833 ToSendStuffBit(0);
834 ToSendStuffBit(0);
835 ToSendStuffBit(0);
836
837 // Send startbit
838 ToSend[++ToSendMax] = SEC_D;
839
840 uint8_t b = cmd;
841 for(i = 0; i < 4; i++) {
842 if(b & 1) {
843 ToSend[++ToSendMax] = SEC_D;
844 } else {
845 ToSend[++ToSendMax] = SEC_E;
846 }
847 b >>= 1;
848 }
849
850 // Send stopbit
851 ToSend[++ToSendMax] = SEC_F;
852
853 // Flush the buffer in FPGA!!
854 for(i = 0; i < 5; i++) {
855 ToSend[++ToSendMax] = SEC_F;
856 }
857
858 // Convert from last byte pos to length
859 ToSendMax++;
860 }
861
862 //-----------------------------------------------------------------------------
863 // Wait for commands from reader
864 // Stop when button is pressed
865 // Or return TRUE when command is captured
866 //-----------------------------------------------------------------------------
867 static int GetIso14443aCommandFromReader(uint8_t *received, int *len, int maxLen)
868 {
869 // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen
870 // only, since we are receiving, not transmitting).
871 // Signal field is off with the appropriate LED
872 LED_D_OFF();
873 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
874
875 // Now run a `software UART' on the stream of incoming samples.
876 Uart.output = received;
877 Uart.byteCntMax = maxLen;
878 Uart.state = STATE_UNSYNCD;
879
880 for(;;) {
881 WDT_HIT();
882
883 if(BUTTON_PRESS()) return FALSE;
884
885 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
886 AT91C_BASE_SSC->SSC_THR = 0x00;
887 }
888 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
889 uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
890 if(MillerDecoding((b & 0xf0) >> 4)) {
891 *len = Uart.byteCnt;
892 return TRUE;
893 }
894 if(MillerDecoding(b & 0x0f)) {
895 *len = Uart.byteCnt;
896 return TRUE;
897 }
898 }
899 }
900 }
901 static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded);
902
903 //-----------------------------------------------------------------------------
904 // Main loop of simulated tag: receive commands from reader, decide what
905 // response to send, and send it.
906 //-----------------------------------------------------------------------------
907 void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd)
908 {
909 // Enable and clear the trace
910 tracing = TRUE;
911 iso14a_clear_trace();
912
913 // This function contains the tag emulation
914 uint8_t sak;
915
916 // The first response contains the ATQA (note: bytes are transmitted in reverse order).
917 uint8_t response1[2];
918
919 switch (tagType) {
920 case 1: { // MIFARE Classic
921 // Says: I am Mifare 1k - original line
922 response1[0] = 0x04;
923 response1[1] = 0x00;
924 sak = 0x08;
925 } break;
926 case 2: { // MIFARE Ultralight
927 // Says: I am a stupid memory tag, no crypto
928 response1[0] = 0x04;
929 response1[1] = 0x00;
930 sak = 0x00;
931 } break;
932 case 3: { // MIFARE DESFire
933 // Says: I am a DESFire tag, ph33r me
934 response1[0] = 0x04;
935 response1[1] = 0x03;
936 sak = 0x20;
937 } break;
938 case 4: { // ISO/IEC 14443-4
939 // Says: I am a javacard (JCOP)
940 response1[0] = 0x04;
941 response1[1] = 0x00;
942 sak = 0x28;
943 } break;
944 default: {
945 Dbprintf("Error: unkown tagtype (%d)",tagType);
946 return;
947 } break;
948 }
949
950 // The second response contains the (mandatory) first 24 bits of the UID
951 uint8_t response2[5];
952
953 // Check if the uid uses the (optional) part
954 uint8_t response2a[5];
955 if (uid_2nd) {
956 response2[0] = 0x88;
957 num_to_bytes(uid_1st,3,response2+1);
958 num_to_bytes(uid_2nd,4,response2a);
959 response2a[4] = response2a[0] ^ response2a[1] ^ response2a[2] ^ response2a[3];
960
961 // Configure the ATQA and SAK accordingly
962 response1[0] |= 0x40;
963 sak |= 0x04;
964 } else {
965 num_to_bytes(uid_1st,4,response2);
966 // Configure the ATQA and SAK accordingly
967 response1[0] &= 0xBF;
968 sak &= 0xFB;
969 }
970
971 // Calculate the BitCountCheck (BCC) for the first 4 bytes of the UID.
972 response2[4] = response2[0] ^ response2[1] ^ response2[2] ^ response2[3];
973
974 // Prepare the mandatory SAK (for 4 and 7 byte UID)
975 uint8_t response3[3];
976 response3[0] = sak;
977 ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]);
978
979 // Prepare the optional second SAK (for 7 byte UID), drop the cascade bit
980 uint8_t response3a[3];
981 response3a[0] = sak & 0xFB;
982 ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
983
984 uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce
985 uint8_t response6[] = { 0x03, 0x3B, 0x00, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS
986 ComputeCrc14443(CRC_14443_A, response6, 3, &response6[3], &response6[4]);
987
988 uint8_t *resp;
989 int respLen;
990
991 // Longest possible response will be 16 bytes + 2 CRC = 18 bytes
992 // This will need
993 // 144 data bits (18 * 8)
994 // 18 parity bits
995 // 2 Start and stop
996 // 1 Correction bit (Answer in 1172 or 1236 periods, see FPGA)
997 // 1 just for the case
998 // ----------- +
999 // 166
1000 //
1001 // 166 bytes, since every bit that needs to be send costs us a byte
1002 //
1003
1004 // Respond with card type
1005 uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
1006 int resp1Len;
1007
1008 // Anticollision cascade1 - respond with uid
1009 uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 166);
1010 int resp2Len;
1011
1012 // Anticollision cascade2 - respond with 2nd half of uid if asked
1013 // we're only going to be asked if we set the 1st byte of the UID (during cascade1) to 0x88
1014 uint8_t *resp2a = (((uint8_t *)BigBuf) + 1140);
1015 int resp2aLen;
1016
1017 // Acknowledge select - cascade 1
1018 uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*2));
1019 int resp3Len;
1020
1021 // Acknowledge select - cascade 2
1022 uint8_t *resp3a = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*3));
1023 int resp3aLen;
1024
1025 // Response to a read request - not implemented atm
1026 uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*4));
1027 int resp4Len;
1028
1029 // Authenticate response - nonce
1030 uint8_t *resp5 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*5));
1031 int resp5Len;
1032
1033 // Authenticate response - nonce
1034 uint8_t *resp6 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*6));
1035 int resp6Len;
1036
1037 uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
1038 int len;
1039
1040 // To control where we are in the protocol
1041 int order = 0;
1042 int lastorder;
1043
1044 // Just to allow some checks
1045 int happened = 0;
1046 int happened2 = 0;
1047
1048 int cmdsRecvd = 0;
1049 uint8_t* respdata = NULL;
1050 int respsize = 0;
1051 uint8_t nack = 0x04;
1052
1053 memset(receivedCmd, 0x44, RECV_CMD_SIZE);
1054
1055 // Prepare the responses of the anticollision phase
1056 // there will be not enough time to do this at the moment the reader sends it REQA
1057
1058 // Answer to request
1059 CodeIso14443aAsTag(response1, sizeof(response1));
1060 memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
1061
1062 // Send our UID (cascade 1)
1063 CodeIso14443aAsTag(response2, sizeof(response2));
1064 memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax;
1065
1066 // Answer to select (cascade1)
1067 CodeIso14443aAsTag(response3, sizeof(response3));
1068 memcpy(resp3, ToSend, ToSendMax); resp3Len = ToSendMax;
1069
1070 // Send the cascade 2 2nd part of the uid
1071 CodeIso14443aAsTag(response2a, sizeof(response2a));
1072 memcpy(resp2a, ToSend, ToSendMax); resp2aLen = ToSendMax;
1073
1074 // Answer to select (cascade 2)
1075 CodeIso14443aAsTag(response3a, sizeof(response3a));
1076 memcpy(resp3a, ToSend, ToSendMax); resp3aLen = ToSendMax;
1077
1078 // Strange answer is an example of rare message size (3 bits)
1079 CodeStrangeAnswerAsTag();
1080 memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax;
1081
1082 // Authentication answer (random nonce)
1083 CodeIso14443aAsTag(response5, sizeof(response5));
1084 memcpy(resp5, ToSend, ToSendMax); resp5Len = ToSendMax;
1085
1086 // dummy ATS (pseudo-ATR), answer to RATS
1087 CodeIso14443aAsTag(response6, sizeof(response6));
1088 memcpy(resp6, ToSend, ToSendMax); resp6Len = ToSendMax;
1089
1090 // We need to listen to the high-frequency, peak-detected path.
1091 SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1092 FpgaSetupSsc();
1093
1094 cmdsRecvd = 0;
1095
1096 LED_A_ON();
1097 for(;;) {
1098
1099 if(!GetIso14443aCommandFromReader(receivedCmd, &len, RECV_CMD_SIZE)) {
1100 DbpString("button press");
1101 break;
1102 }
1103 // doob - added loads of debug strings so we can see what the reader is saying to us during the sim as hi14alist is not populated
1104 // Okay, look at the command now.
1105 lastorder = order;
1106 if(receivedCmd[0] == 0x26) { // Received a REQUEST
1107 resp = resp1; respLen = resp1Len; order = 1;
1108 respdata = response1;
1109 respsize = sizeof(response1);
1110 } else if(receivedCmd[0] == 0x52) { // Received a WAKEUP
1111 resp = resp1; respLen = resp1Len; order = 6;
1112 respdata = response1;
1113 respsize = sizeof(response1);
1114 } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x93) { // Received request for UID (cascade 1)
1115 resp = resp2; respLen = resp2Len; order = 2;
1116 respdata = response2;
1117 respsize = sizeof(response2);
1118 } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x95) { // Received request for UID (cascade 2)
1119 resp = resp2a; respLen = resp2aLen; order = 20;
1120 respdata = response2a;
1121 respsize = sizeof(response2a);
1122 } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x93) { // Received a SELECT (cascade 1)
1123 resp = resp3; respLen = resp3Len; order = 3;
1124 respdata = response3;
1125 respsize = sizeof(response3);
1126 } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x95) { // Received a SELECT (cascade 2)
1127 resp = resp3a; respLen = resp3aLen; order = 30;
1128 respdata = response3a;
1129 respsize = sizeof(response3a);
1130 } else if(receivedCmd[0] == 0x30) { // Received a (plain) READ
1131 resp = resp4; respLen = resp4Len; order = 4; // Do nothing
1132 Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]);
1133 respdata = &nack;
1134 respsize = sizeof(nack); // 4-bit answer
1135 } else if(receivedCmd[0] == 0x50) { // Received a HALT
1136 DbpString("Reader requested we HALT!:");
1137 // Do not respond
1138 resp = resp1; respLen = 0; order = 0;
1139 respdata = NULL;
1140 respsize = 0;
1141 } else if(receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61) { // Received an authentication request
1142 resp = resp5; respLen = resp5Len; order = 7;
1143 respdata = response5;
1144 respsize = sizeof(response5);
1145 } else if(receivedCmd[0] == 0xE0) { // Received a RATS request
1146 resp = resp6; respLen = resp6Len; order = 70;
1147 respdata = response6;
1148 respsize = sizeof(response6);
1149 } else {
1150 // Never seen this command before
1151 Dbprintf("Received (len=%d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",
1152 len,
1153 receivedCmd[0], receivedCmd[1], receivedCmd[2],
1154 receivedCmd[3], receivedCmd[4], receivedCmd[5],
1155 receivedCmd[6], receivedCmd[7], receivedCmd[8]);
1156 // Do not respond
1157 resp = resp1; respLen = 0; order = 0;
1158 respdata = NULL;
1159 respsize = 0;
1160 }
1161
1162 // Count number of wakeups received after a halt
1163 if(order == 6 && lastorder == 5) { happened++; }
1164
1165 // Count number of other messages after a halt
1166 if(order != 6 && lastorder == 5) { happened2++; }
1167
1168 // Look at last parity bit to determine timing of answer
1169 if((Uart.parityBits & 0x01) || receivedCmd[0] == 0x52) {
1170 // 1236, so correction bit needed
1171 //i = 0;
1172 }
1173
1174 if(cmdsRecvd > 999) {
1175 DbpString("1000 commands later...");
1176 break;
1177 } else {
1178 cmdsRecvd++;
1179 }
1180
1181 if(respLen > 0) {
1182 EmSendCmd14443aRaw(resp, respLen, receivedCmd[0] == 0x52);
1183 }
1184
1185 if (tracing) {
1186 LogTrace(receivedCmd,len, 0, Uart.parityBits, TRUE);
1187 if (respdata != NULL) {
1188 LogTrace(respdata,respsize, 0, SwapBits(GetParity(respdata,respsize),respsize), FALSE);
1189 }
1190 if(traceLen > TRACE_SIZE) {
1191 DbpString("Trace full");
1192 break;
1193 }
1194 }
1195
1196 memset(receivedCmd, 0x44, RECV_CMD_SIZE);
1197 }
1198
1199 Dbprintf("%x %x %x", happened, happened2, cmdsRecvd);
1200 LED_A_OFF();
1201 }
1202
1203 //-----------------------------------------------------------------------------
1204 // Transmit the command (to the tag) that was placed in ToSend[].
1205 //-----------------------------------------------------------------------------
1206 static void TransmitFor14443a(const uint8_t *cmd, int len, int *samples, int *wait)
1207 {
1208 int c;
1209
1210 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1211
1212 if (wait)
1213 if(*wait < 10)
1214 *wait = 10;
1215
1216 for(c = 0; c < *wait;) {
1217 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1218 AT91C_BASE_SSC->SSC_THR = 0x00; // For exact timing!
1219 c++;
1220 }
1221 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1222 volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
1223 (void)r;
1224 }
1225 WDT_HIT();
1226 }
1227
1228 c = 0;
1229 for(;;) {
1230 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1231 AT91C_BASE_SSC->SSC_THR = cmd[c];
1232 c++;
1233 if(c >= len) {
1234 break;
1235 }
1236 }
1237 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1238 volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
1239 (void)r;
1240 }
1241 WDT_HIT();
1242 }
1243 if (samples) *samples = (c + *wait) << 3;
1244 }
1245
1246 //-----------------------------------------------------------------------------
1247 // Code a 7-bit command without parity bit
1248 // This is especially for 0x26 and 0x52 (REQA and WUPA)
1249 //-----------------------------------------------------------------------------
1250 void ShortFrameFromReader(const uint8_t bt)
1251 {
1252 int j;
1253 int last;
1254 uint8_t b;
1255
1256 ToSendReset();
1257
1258 // Start of Communication (Seq. Z)
1259 ToSend[++ToSendMax] = SEC_Z;
1260 last = 0;
1261
1262 b = bt;
1263 for(j = 0; j < 7; j++) {
1264 if(b & 1) {
1265 // Sequence X
1266 ToSend[++ToSendMax] = SEC_X;
1267 last = 1;
1268 } else {
1269 if(last == 0) {
1270 // Sequence Z
1271 ToSend[++ToSendMax] = SEC_Z;
1272 }
1273 else {
1274 // Sequence Y
1275 ToSend[++ToSendMax] = SEC_Y;
1276 last = 0;
1277 }
1278 }
1279 b >>= 1;
1280 }
1281
1282 // End of Communication
1283 if(last == 0) {
1284 // Sequence Z
1285 ToSend[++ToSendMax] = SEC_Z;
1286 }
1287 else {
1288 // Sequence Y
1289 ToSend[++ToSendMax] = SEC_Y;
1290 last = 0;
1291 }
1292 // Sequence Y
1293 ToSend[++ToSendMax] = SEC_Y;
1294
1295 // Just to be sure!
1296 ToSend[++ToSendMax] = SEC_Y;
1297 ToSend[++ToSendMax] = SEC_Y;
1298 ToSend[++ToSendMax] = SEC_Y;
1299
1300 // Convert from last character reference to length
1301 ToSendMax++;
1302 }
1303
1304 //-----------------------------------------------------------------------------
1305 // Prepare reader command to send to FPGA
1306 //
1307 //-----------------------------------------------------------------------------
1308 void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity)
1309 {
1310 int i, j;
1311 int last;
1312 uint8_t b;
1313
1314 ToSendReset();
1315
1316 // Start of Communication (Seq. Z)
1317 ToSend[++ToSendMax] = SEC_Z;
1318 last = 0;
1319
1320 // Generate send structure for the data bits
1321 for (i = 0; i < len; i++) {
1322 // Get the current byte to send
1323 b = cmd[i];
1324
1325 for (j = 0; j < 8; j++) {
1326 if (b & 1) {
1327 // Sequence X
1328 ToSend[++ToSendMax] = SEC_X;
1329 last = 1;
1330 } else {
1331 if (last == 0) {
1332 // Sequence Z
1333 ToSend[++ToSendMax] = SEC_Z;
1334 } else {
1335 // Sequence Y
1336 ToSend[++ToSendMax] = SEC_Y;
1337 last = 0;
1338 }
1339 }
1340 b >>= 1;
1341 }
1342
1343 // Get the parity bit
1344 if ((dwParity >> i) & 0x01) {
1345 // Sequence X
1346 ToSend[++ToSendMax] = SEC_X;
1347 last = 1;
1348 } else {
1349 if (last == 0) {
1350 // Sequence Z
1351 ToSend[++ToSendMax] = SEC_Z;
1352 } else {
1353 // Sequence Y
1354 ToSend[++ToSendMax] = SEC_Y;
1355 last = 0;
1356 }
1357 }
1358 }
1359
1360 // End of Communication
1361 if (last == 0) {
1362 // Sequence Z
1363 ToSend[++ToSendMax] = SEC_Z;
1364 } else {
1365 // Sequence Y
1366 ToSend[++ToSendMax] = SEC_Y;
1367 last = 0;
1368 }
1369 // Sequence Y
1370 ToSend[++ToSendMax] = SEC_Y;
1371
1372 // Just to be sure!
1373 ToSend[++ToSendMax] = SEC_Y;
1374 ToSend[++ToSendMax] = SEC_Y;
1375 ToSend[++ToSendMax] = SEC_Y;
1376
1377 // Convert from last character reference to length
1378 ToSendMax++;
1379 }
1380
1381 //-----------------------------------------------------------------------------
1382 // Wait for commands from reader
1383 // Stop when button is pressed (return 1) or field was gone (return 2)
1384 // Or return 0 when command is captured
1385 //-----------------------------------------------------------------------------
1386 static int EmGetCmd(uint8_t *received, int *len, int maxLen)
1387 {
1388 *len = 0;
1389
1390 uint32_t timer = 0, vtime = 0;
1391 int analogCnt = 0;
1392 int analogAVG = 0;
1393
1394 // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen
1395 // only, since we are receiving, not transmitting).
1396 // Signal field is off with the appropriate LED
1397 LED_D_OFF();
1398 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
1399
1400 // Set ADC to read field strength
1401 AT91C_BASE_ADC->ADC_CR = AT91C_ADC_SWRST;
1402 AT91C_BASE_ADC->ADC_MR =
1403 ADC_MODE_PRESCALE(32) |
1404 ADC_MODE_STARTUP_TIME(16) |
1405 ADC_MODE_SAMPLE_HOLD_TIME(8);
1406 AT91C_BASE_ADC->ADC_CHER = ADC_CHANNEL(ADC_CHAN_HF);
1407 // start ADC
1408 AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
1409
1410 // Now run a 'software UART' on the stream of incoming samples.
1411 Uart.output = received;
1412 Uart.byteCntMax = maxLen;
1413 Uart.state = STATE_UNSYNCD;
1414
1415 for(;;) {
1416 WDT_HIT();
1417
1418 if (BUTTON_PRESS()) return 1;
1419
1420 // test if the field exists
1421 if (AT91C_BASE_ADC->ADC_SR & ADC_END_OF_CONVERSION(ADC_CHAN_HF)) {
1422 analogCnt++;
1423 analogAVG += AT91C_BASE_ADC->ADC_CDR[ADC_CHAN_HF];
1424 AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
1425 if (analogCnt >= 32) {
1426 if ((33000 * (analogAVG / analogCnt) >> 10) < MF_MINFIELDV) {
1427 vtime = GetTickCount();
1428 if (!timer) timer = vtime;
1429 // 50ms no field --> card to idle state
1430 if (vtime - timer > 50) return 2;
1431 } else
1432 if (timer) timer = 0;
1433 analogCnt = 0;
1434 analogAVG = 0;
1435 }
1436 }
1437 // transmit none
1438 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1439 AT91C_BASE_SSC->SSC_THR = 0x00;
1440 }
1441 // receive and test the miller decoding
1442 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1443 volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
1444 if(MillerDecoding((b & 0xf0) >> 4)) {
1445 *len = Uart.byteCnt;
1446 if (tracing) LogTrace(received, *len, GetDeltaCountUS(), Uart.parityBits, TRUE);
1447 return 0;
1448 }
1449 if(MillerDecoding(b & 0x0f)) {
1450 *len = Uart.byteCnt;
1451 if (tracing) LogTrace(received, *len, GetDeltaCountUS(), Uart.parityBits, TRUE);
1452 return 0;
1453 }
1454 }
1455 }
1456 }
1457
1458 static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded)
1459 {
1460 int i, u = 0;
1461 uint8_t b = 0;
1462
1463 // Modulate Manchester
1464 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD);
1465 AT91C_BASE_SSC->SSC_THR = 0x00;
1466 FpgaSetupSsc();
1467
1468 // include correction bit
1469 i = 1;
1470 if((Uart.parityBits & 0x01) || correctionNeeded) {
1471 // 1236, so correction bit needed
1472 i = 0;
1473 }
1474
1475 // send cycle
1476 for(;;) {
1477 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1478 volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
1479 (void)b;
1480 }
1481 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1482 if(i > respLen) {
1483 b = 0xff; // was 0x00
1484 u++;
1485 } else {
1486 b = resp[i];
1487 i++;
1488 }
1489 AT91C_BASE_SSC->SSC_THR = b;
1490
1491 if(u > 4) break;
1492 }
1493 if(BUTTON_PRESS()) {
1494 break;
1495 }
1496 }
1497
1498 return 0;
1499 }
1500
1501 int EmSend4bitEx(uint8_t resp, int correctionNeeded){
1502 Code4bitAnswerAsTag(resp);
1503 int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded);
1504 if (tracing) LogTrace(&resp, 1, GetDeltaCountUS(), GetParity(&resp, 1), FALSE);
1505 return res;
1506 }
1507
1508 int EmSend4bit(uint8_t resp){
1509 return EmSend4bitEx(resp, 0);
1510 }
1511
1512 int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par){
1513 CodeIso14443aAsTagPar(resp, respLen, par);
1514 int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded);
1515 if (tracing) LogTrace(resp, respLen, GetDeltaCountUS(), par, FALSE);
1516 return res;
1517 }
1518
1519 int EmSendCmdEx(uint8_t *resp, int respLen, int correctionNeeded){
1520 return EmSendCmdExPar(resp, respLen, correctionNeeded, GetParity(resp, respLen));
1521 }
1522
1523 int EmSendCmd(uint8_t *resp, int respLen){
1524 return EmSendCmdExPar(resp, respLen, 0, GetParity(resp, respLen));
1525 }
1526
1527 int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par){
1528 return EmSendCmdExPar(resp, respLen, 0, par);
1529 }
1530
1531 //-----------------------------------------------------------------------------
1532 // Wait a certain time for tag response
1533 // If a response is captured return TRUE
1534 // If it takes to long return FALSE
1535 //-----------------------------------------------------------------------------
1536 static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) //uint8_t *buffer
1537 {
1538 // buffer needs to be 512 bytes
1539 int c;
1540
1541 // Set FPGA mode to "reader listen mode", no modulation (listen
1542 // only, since we are receiving, not transmitting).
1543 // Signal field is on with the appropriate LED
1544 LED_D_ON();
1545 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN);
1546
1547 // Now get the answer from the card
1548 Demod.output = receivedResponse;
1549 Demod.len = 0;
1550 Demod.state = DEMOD_UNSYNCD;
1551
1552 uint8_t b;
1553 if (elapsed) *elapsed = 0;
1554
1555 c = 0;
1556 for(;;) {
1557 WDT_HIT();
1558
1559 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1560 AT91C_BASE_SSC->SSC_THR = 0x00; // To make use of exact timing of next command from reader!!
1561 if (elapsed) (*elapsed)++;
1562 }
1563 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1564 if(c < iso14a_timeout) { c++; } else { return FALSE; }
1565 b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
1566 if(ManchesterDecoding((b>>4) & 0xf)) {
1567 *samples = ((c - 1) << 3) + 4;
1568 return TRUE;
1569 }
1570 if(ManchesterDecoding(b & 0x0f)) {
1571 *samples = c << 3;
1572 return TRUE;
1573 }
1574 }
1575 }
1576 }
1577
1578 void ReaderTransmitShort(const uint8_t* bt)
1579 {
1580 int wait = 0;
1581 int samples = 0;
1582
1583 ShortFrameFromReader(*bt);
1584
1585 // Select the card
1586 TransmitFor14443a(ToSend, ToSendMax, &samples, &wait);
1587
1588 // Store reader command in buffer
1589 if (tracing) LogTrace(bt,1,0,GetParity(bt,1),TRUE);
1590 }
1591
1592 void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par)
1593 {
1594 int wait = 0;
1595 int samples = 0;
1596
1597 // This is tied to other size changes
1598 // uint8_t* frame_addr = ((uint8_t*)BigBuf) + 2024;
1599 CodeIso14443aAsReaderPar(frame,len,par);
1600
1601 // Select the card
1602 TransmitFor14443a(ToSend, ToSendMax, &samples, &wait);
1603 if(trigger)
1604 LED_A_ON();
1605
1606 // Store reader command in buffer
1607 if (tracing) LogTrace(frame,len,0,par,TRUE);
1608 }
1609
1610
1611 void ReaderTransmit(uint8_t* frame, int len)
1612 {
1613 // Generate parity and redirect
1614 ReaderTransmitPar(frame,len,GetParity(frame,len));
1615 }
1616
1617 int ReaderReceive(uint8_t* receivedAnswer)
1618 {
1619 int samples = 0;
1620 if (!GetIso14443aAnswerFromTag(receivedAnswer,160,&samples,0)) return FALSE;
1621 if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE);
1622 if(samples == 0) return FALSE;
1623 return Demod.len;
1624 }
1625
1626 int ReaderReceivePar(uint8_t* receivedAnswer, uint32_t * parptr)
1627 {
1628 int samples = 0;
1629 if (!GetIso14443aAnswerFromTag(receivedAnswer,160,&samples,0)) return FALSE;
1630 if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE);
1631 *parptr = Demod.parityBits;
1632 if(samples == 0) return FALSE;
1633 return Demod.len;
1634 }
1635
1636 /* performs iso14443a anticolision procedure
1637 * fills the uid pointer unless NULL
1638 * fills resp_data unless NULL */
1639 int iso14443a_select_card(uint8_t * uid_ptr, iso14a_card_select_t * resp_data, uint32_t * cuid_ptr) {
1640 uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP
1641 uint8_t sel_all[] = { 0x93,0x20 };
1642 uint8_t sel_uid[] = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
1643 uint8_t rats[] = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0
1644
1645 uint8_t* resp = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); // was 3560 - tied to other size changes
1646
1647 uint8_t sak = 0x04; // cascade uid
1648 int cascade_level = 0;
1649
1650 int len;
1651
1652 // clear uid
1653 memset(uid_ptr, 0, 12);
1654
1655 // Broadcast for a card, WUPA (0x52) will force response from all cards in the field
1656 ReaderTransmitShort(wupa);
1657 // Receive the ATQA
1658 if(!ReaderReceive(resp)) return 0;
1659 // Dbprintf("atqa: %02x %02x",resp[0],resp[1]);
1660
1661 if(resp_data)
1662 memcpy(resp_data->atqa, resp, 2);
1663
1664 // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in
1665 // which case we need to make a cascade 2 request and select - this is a long UID
1666 // While the UID is not complete, the 3nd bit (from the right) is set in the SAK.
1667 for(; sak & 0x04; cascade_level++)
1668 {
1669 // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97)
1670 sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2;
1671
1672 // SELECT_ALL
1673 ReaderTransmit(sel_all,sizeof(sel_all));
1674 if (!ReaderReceive(resp)) return 0;
1675 // Dbprintf("uid: %02x %02x %02x %02x",resp[0],resp[1],resp[2],resp[3]);
1676
1677 if(uid_ptr) memcpy(uid_ptr + cascade_level*4, resp, 4);
1678
1679 // calculate crypto UID
1680 if(cuid_ptr) *cuid_ptr = bytes_to_num(resp, 4);
1681
1682 // Construct SELECT UID command
1683 memcpy(sel_uid+2,resp,5);
1684 AppendCrc14443a(sel_uid,7);
1685 ReaderTransmit(sel_uid,sizeof(sel_uid));
1686
1687 // Receive the SAK
1688 if (!ReaderReceive(resp)) return 0;
1689 sak = resp[0];
1690 }
1691 if(resp_data) {
1692 resp_data->sak = sak;
1693 resp_data->ats_len = 0;
1694 }
1695 //-- this byte not UID, it CT. http://www.nxp.com/documents/application_note/AN10927.pdf page 3
1696 if (uid_ptr[0] == 0x88) {
1697 memcpy(uid_ptr, uid_ptr + 1, 7);
1698 uid_ptr[7] = 0;
1699 }
1700
1701 if( (sak & 0x20) == 0)
1702 return 2; // non iso14443a compliant tag
1703
1704 // Request for answer to select
1705 if(resp_data) { // JCOP cards - if reader sent RATS then there is no MIFARE session at all!!!
1706 AppendCrc14443a(rats, 2);
1707 ReaderTransmit(rats, sizeof(rats));
1708
1709 if (!(len = ReaderReceive(resp))) return 0;
1710
1711 memcpy(resp_data->ats, resp, sizeof(resp_data->ats));
1712 resp_data->ats_len = len;
1713 }
1714
1715 // reset the PCB block number
1716 iso14_pcb_blocknum = 0;
1717
1718 return 1;
1719 }
1720
1721 void iso14443a_setup() {
1722 // Set up the synchronous serial port
1723 FpgaSetupSsc();
1724 // Start from off (no field generated)
1725 // Signal field is off with the appropriate LED
1726 LED_D_OFF();
1727 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1728 SpinDelay(50);
1729
1730 SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1731
1732 // Now give it time to spin up.
1733 // Signal field is on with the appropriate LED
1734 LED_D_ON();
1735 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1736 SpinDelay(50);
1737
1738 iso14a_timeout = 2048; //default
1739 }
1740
1741 int iso14_apdu(uint8_t * cmd, size_t cmd_len, void * data) {
1742 uint8_t real_cmd[cmd_len+4];
1743 real_cmd[0] = 0x0a; //I-Block
1744 // put block number into the PCB
1745 real_cmd[0] |= iso14_pcb_blocknum;
1746 real_cmd[1] = 0x00; //CID: 0 //FIXME: allow multiple selected cards
1747 memcpy(real_cmd+2, cmd, cmd_len);
1748 AppendCrc14443a(real_cmd,cmd_len+2);
1749
1750 ReaderTransmit(real_cmd, cmd_len+4);
1751 size_t len = ReaderReceive(data);
1752 uint8_t * data_bytes = (uint8_t *) data;
1753 if (!len)
1754 return 0; //DATA LINK ERROR
1755 // if we received an I- or R(ACK)-Block with a block number equal to the
1756 // current block number, toggle the current block number
1757 else if (len >= 4 // PCB+CID+CRC = 4 bytes
1758 && ((data_bytes[0] & 0xC0) == 0 // I-Block
1759 || (data_bytes[0] & 0xD0) == 0x80) // R-Block with ACK bit set to 0
1760 && (data_bytes[0] & 0x01) == iso14_pcb_blocknum) // equal block numbers
1761 {
1762 iso14_pcb_blocknum ^= 1;
1763 }
1764
1765 return len;
1766 }
1767
1768 //-----------------------------------------------------------------------------
1769 // Read an ISO 14443a tag. Send out commands and store answers.
1770 //
1771 //-----------------------------------------------------------------------------
1772 void ReaderIso14443a(UsbCommand * c)
1773 {
1774 iso14a_command_t param = c->arg[0];
1775 uint8_t * cmd = c->d.asBytes;
1776 size_t len = c->arg[1];
1777 uint32_t arg0;
1778 byte_t buf[48];
1779
1780 iso14a_clear_trace();
1781 iso14a_set_tracing(true);
1782
1783 if(param & ISO14A_REQUEST_TRIGGER) iso14a_set_trigger(1);
1784
1785 if(param & ISO14A_CONNECT) {
1786 iso14443a_setup();
1787 arg0 = iso14443a_select_card(buf, (iso14a_card_select_t *)(buf+12), NULL);
1788 cmd_send(CMD_ACK,arg0,0,0,buf,48);
1789 // UsbSendPacket((void *)ack, sizeof(UsbCommand));
1790 }
1791
1792 if(param & ISO14A_SET_TIMEOUT) {
1793 iso14a_timeout = c->arg[2];
1794 }
1795
1796 if(param & ISO14A_SET_TIMEOUT) {
1797 iso14a_timeout = c->arg[2];
1798 }
1799
1800 if(param & ISO14A_APDU) {
1801 arg0 = iso14_apdu(cmd, len, buf);
1802 cmd_send(CMD_ACK,arg0,0,0,buf,48);
1803 // UsbSendPacket((void *)ack, sizeof(UsbCommand));
1804 }
1805
1806 if(param & ISO14A_RAW) {
1807 if(param & ISO14A_APPEND_CRC) {
1808 AppendCrc14443a(cmd,len);
1809 len += 2;
1810 }
1811 ReaderTransmit(cmd,len);
1812 arg0 = ReaderReceive(buf);
1813 // UsbSendPacket((void *)ack, sizeof(UsbCommand));
1814 cmd_send(CMD_ACK,arg0,0,0,buf,48);
1815 }
1816
1817 if(param & ISO14A_REQUEST_TRIGGER) iso14a_set_trigger(0);
1818
1819 if(param & ISO14A_NO_DISCONNECT)
1820 return;
1821
1822 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1823 LEDsoff();
1824 }
1825
1826 //-----------------------------------------------------------------------------
1827 // Read an ISO 14443a tag. Send out commands and store answers.
1828 //
1829 //-----------------------------------------------------------------------------
1830 void ReaderMifare(uint32_t parameter)
1831 {
1832 // Mifare AUTH
1833 uint8_t mf_auth[] = { 0x60,0x00,0xf5,0x7b };
1834 uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
1835
1836 uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); // was 3560 - tied to other size changes
1837 traceLen = 0;
1838 tracing = false;
1839
1840 iso14443a_setup();
1841
1842 LED_A_ON();
1843 LED_B_OFF();
1844 LED_C_OFF();
1845
1846 byte_t nt_diff = 0;
1847 LED_A_OFF();
1848 byte_t par = 0;
1849 //byte_t par_mask = 0xff;
1850 byte_t par_low = 0;
1851 int led_on = TRUE;
1852 uint8_t uid[8];
1853 uint32_t cuid;
1854
1855 tracing = FALSE;
1856 byte_t nt[4] = {0,0,0,0};
1857 byte_t nt_attacked[4], nt_noattack[4];
1858 byte_t par_list[8] = {0,0,0,0,0,0,0,0};
1859 byte_t ks_list[8] = {0,0,0,0,0,0,0,0};
1860 num_to_bytes(parameter, 4, nt_noattack);
1861 int isOK = 0, isNULL = 0;
1862
1863 while(TRUE)
1864 {
1865 LED_C_OFF();
1866 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1867 SpinDelay(50);
1868 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1869 LED_C_ON();
1870 SpinDelay(2);
1871
1872 // Test if the action was cancelled
1873 if(BUTTON_PRESS()) {
1874 break;
1875 }
1876
1877 if(!iso14443a_select_card(uid, NULL, &cuid)) continue;
1878
1879 // Transmit MIFARE_CLASSIC_AUTH
1880 ReaderTransmit(mf_auth, sizeof(mf_auth));
1881
1882 // Receive the (16 bit) "random" nonce
1883 if (!ReaderReceive(receivedAnswer)) continue;
1884 memcpy(nt, receivedAnswer, 4);
1885
1886 // Transmit reader nonce and reader answer
1887 ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar),par);
1888
1889 // Receive 4 bit answer
1890 if (ReaderReceive(receivedAnswer))
1891 {
1892 if ( (parameter != 0) && (memcmp(nt, nt_noattack, 4) == 0) ) continue;
1893
1894 isNULL = !(nt_attacked[0] == 0) && (nt_attacked[1] == 0) && (nt_attacked[2] == 0) && (nt_attacked[3] == 0);
1895 if ( (isNULL != 0 ) && (memcmp(nt, nt_attacked, 4) != 0) ) continue;
1896
1897 if (nt_diff == 0)
1898 {
1899 LED_A_ON();
1900 memcpy(nt_attacked, nt, 4);
1901 //par_mask = 0xf8;
1902 par_low = par & 0x07;
1903 }
1904
1905 led_on = !led_on;
1906 if(led_on) LED_B_ON(); else LED_B_OFF();
1907 par_list[nt_diff] = par;
1908 ks_list[nt_diff] = receivedAnswer[0] ^ 0x05;
1909
1910 // Test if the information is complete
1911 if (nt_diff == 0x07) {
1912 isOK = 1;
1913 break;
1914 }
1915
1916 nt_diff = (nt_diff + 1) & 0x07;
1917 mf_nr_ar[3] = nt_diff << 5;
1918 par = par_low;
1919 } else {
1920 if (nt_diff == 0)
1921 {
1922 par++;
1923 } else {
1924 par = (((par >> 3) + 1) << 3) | par_low;
1925 }
1926 }
1927 }
1928
1929 LogTrace(nt, 4, 0, GetParity(nt, 4), TRUE);
1930 LogTrace(par_list, 8, 0, GetParity(par_list, 8), TRUE);
1931 LogTrace(ks_list, 8, 0, GetParity(ks_list, 8), TRUE);
1932
1933 byte_t buf[48];
1934 // UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
1935 memcpy(buf + 0, uid, 4);
1936 memcpy(buf + 4, nt, 4);
1937 memcpy(buf + 8, par_list, 8);
1938 memcpy(buf + 16, ks_list, 8);
1939
1940 LED_B_ON();
1941 cmd_send(CMD_ACK,isOK,0,0,buf,48);
1942 // UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
1943 LED_B_OFF();
1944
1945 // Thats it...
1946 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1947 LEDsoff();
1948 tracing = TRUE;
1949
1950 if (MF_DBGLEVEL >= 1) DbpString("COMMAND mifare FINISHED");
1951 }
1952
1953
1954 //-----------------------------------------------------------------------------
1955 // MIFARE 1K simulate.
1956 //
1957 //-----------------------------------------------------------------------------
1958 void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
1959 {
1960 int cardSTATE = MFEMUL_NOFIELD;
1961 int _7BUID = 0;
1962 int vHf = 0; // in mV
1963 //int nextCycleTimeout = 0;
1964 int res;
1965 // uint32_t timer = 0;
1966 uint32_t selTimer = 0;
1967 uint32_t authTimer = 0;
1968 uint32_t par = 0;
1969 int len = 0;
1970 uint8_t cardWRBL = 0;
1971 uint8_t cardAUTHSC = 0;
1972 uint8_t cardAUTHKEY = 0xff; // no authentication
1973 //uint32_t cardRn = 0;
1974 uint32_t cardRr = 0;
1975 uint32_t cuid = 0;
1976 //uint32_t rn_enc = 0;
1977 uint32_t ans = 0;
1978 uint32_t cardINTREG = 0;
1979 uint8_t cardINTBLOCK = 0;
1980 struct Crypto1State mpcs = {0, 0};
1981 struct Crypto1State *pcs;
1982 pcs = &mpcs;
1983
1984 uint8_t* receivedCmd = eml_get_bigbufptr_recbuf();
1985 uint8_t *response = eml_get_bigbufptr_sendbuf();
1986
1987 static uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID
1988
1989 static uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62};
1990 static uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; // !!!
1991
1992 static uint8_t rSAK[] = {0x08, 0xb6, 0xdd};
1993 static uint8_t rSAK1[] = {0x04, 0xda, 0x17};
1994
1995 static uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04};
1996 // static uint8_t rAUTH_NT[] = {0x1a, 0xac, 0xff, 0x4f};
1997 static uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00};
1998
1999 // clear trace
2000 traceLen = 0;
2001 tracing = true;
2002
2003 // Authenticate response - nonce
2004 uint32_t nonce = bytes_to_num(rAUTH_NT, 4);
2005
2006 // get UID from emul memory
2007 emlGetMemBt(receivedCmd, 7, 1);
2008 _7BUID = !(receivedCmd[0] == 0x00);
2009 if (!_7BUID) { // ---------- 4BUID
2010 rATQA[0] = 0x04;
2011
2012 emlGetMemBt(rUIDBCC1, 0, 4);
2013 rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
2014 } else { // ---------- 7BUID
2015 rATQA[0] = 0x44;
2016
2017 rUIDBCC1[0] = 0x88;
2018 emlGetMemBt(&rUIDBCC1[1], 0, 3);
2019 rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
2020 emlGetMemBt(rUIDBCC2, 3, 4);
2021 rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3];
2022 }
2023
2024 // -------------------------------------- test area
2025
2026 // -------------------------------------- END test area
2027 // start mkseconds counter
2028 StartCountUS();
2029
2030 // We need to listen to the high-frequency, peak-detected path.
2031 SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
2032 FpgaSetupSsc();
2033
2034 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
2035 SpinDelay(200);
2036
2037 if (MF_DBGLEVEL >= 1) Dbprintf("Started. 7buid=%d", _7BUID);
2038 // calibrate mkseconds counter
2039 GetDeltaCountUS();
2040 while (true) {
2041 WDT_HIT();
2042
2043 if(BUTTON_PRESS()) {
2044 break;
2045 }
2046
2047 // find reader field
2048 // Vref = 3300mV, and an 10:1 voltage divider on the input
2049 // can measure voltages up to 33000 mV
2050 if (cardSTATE == MFEMUL_NOFIELD) {
2051 vHf = (33000 * AvgAdc(ADC_CHAN_HF)) >> 10;
2052 if (vHf > MF_MINFIELDV) {
2053 cardSTATE_TO_IDLE();
2054 LED_A_ON();
2055 }
2056 }
2057
2058 if (cardSTATE != MFEMUL_NOFIELD) {
2059 res = EmGetCmd(receivedCmd, &len, RECV_CMD_SIZE); // (+ nextCycleTimeout)
2060 if (res == 2) {
2061 cardSTATE = MFEMUL_NOFIELD;
2062 LEDsoff();
2063 continue;
2064 }
2065 if(res) break;
2066 }
2067
2068 //nextCycleTimeout = 0;
2069
2070 // if (len) Dbprintf("len:%d cmd: %02x %02x %02x %02x", len, receivedCmd[0], receivedCmd[1], receivedCmd[2], receivedCmd[3]);
2071
2072 if (len != 4 && cardSTATE != MFEMUL_NOFIELD) { // len != 4 <---- speed up the code 4 authentication
2073 // REQ or WUP request in ANY state and WUP in HALTED state
2074 if (len == 1 && ((receivedCmd[0] == 0x26 && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == 0x52)) {
2075 selTimer = GetTickCount();
2076 EmSendCmdEx(rATQA, sizeof(rATQA), (receivedCmd[0] == 0x52));
2077 cardSTATE = MFEMUL_SELECT1;
2078
2079 // init crypto block
2080 LED_B_OFF();
2081 LED_C_OFF();
2082 crypto1_destroy(pcs);
2083 cardAUTHKEY = 0xff;
2084 }
2085 }
2086
2087 switch (cardSTATE) {
2088 case MFEMUL_NOFIELD:{
2089 break;
2090 }
2091 case MFEMUL_HALTED:{
2092 break;
2093 }
2094 case MFEMUL_IDLE:{
2095 break;
2096 }
2097 case MFEMUL_SELECT1:{
2098 // select all
2099 if (len == 2 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x20)) {
2100 EmSendCmd(rUIDBCC1, sizeof(rUIDBCC1));
2101 break;
2102 }
2103
2104 // select card
2105 if (len == 9 &&
2106 (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) {
2107 if (!_7BUID)
2108 EmSendCmd(rSAK, sizeof(rSAK));
2109 else
2110 EmSendCmd(rSAK1, sizeof(rSAK1));
2111
2112 cuid = bytes_to_num(rUIDBCC1, 4);
2113 if (!_7BUID) {
2114 cardSTATE = MFEMUL_WORK;
2115 LED_B_ON();
2116 if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol1 time: %d", GetTickCount() - selTimer);
2117 break;
2118 } else {
2119 cardSTATE = MFEMUL_SELECT2;
2120 break;
2121 }
2122 }
2123
2124 break;
2125 }
2126 case MFEMUL_SELECT2:{
2127 if (!len) break;
2128
2129 if (len == 2 && (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x20)) {
2130 EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2));
2131 break;
2132 }
2133
2134 // select 2 card
2135 if (len == 9 &&
2136 (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC2, 4) == 0)) {
2137 EmSendCmd(rSAK, sizeof(rSAK));
2138
2139 cuid = bytes_to_num(rUIDBCC2, 4);
2140 cardSTATE = MFEMUL_WORK;
2141 LED_B_ON();
2142 if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol2 time: %d", GetTickCount() - selTimer);
2143 break;
2144 }
2145
2146 // i guess there is a command). go into the work state.
2147 if (len != 4) break;
2148 cardSTATE = MFEMUL_WORK;
2149 goto lbWORK;
2150 }
2151 case MFEMUL_AUTH1:{
2152 if (len == 8) {
2153 // --- crypto
2154 //rn_enc = bytes_to_num(receivedCmd, 4);
2155 //cardRn = rn_enc ^ crypto1_word(pcs, rn_enc , 1);
2156 cardRr = bytes_to_num(&receivedCmd[4], 4) ^ crypto1_word(pcs, 0, 0);
2157 // test if auth OK
2158 if (cardRr != prng_successor(nonce, 64)){
2159 if (MF_DBGLEVEL >= 4) Dbprintf("AUTH FAILED. cardRr=%08x, succ=%08x", cardRr, prng_successor(nonce, 64));
2160 cardSTATE_TO_IDLE();
2161 break;
2162 }
2163 ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0);
2164 num_to_bytes(ans, 4, rAUTH_AT);
2165 // --- crypto
2166 EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
2167 cardSTATE = MFEMUL_AUTH2;
2168 } else {
2169 cardSTATE_TO_IDLE();
2170 }
2171 if (cardSTATE != MFEMUL_AUTH2) break;
2172 }
2173 case MFEMUL_AUTH2:{
2174 LED_C_ON();
2175 cardSTATE = MFEMUL_WORK;
2176 if (MF_DBGLEVEL >= 4) Dbprintf("AUTH COMPLETED. sec=%d, key=%d time=%d", cardAUTHSC, cardAUTHKEY, GetTickCount() - authTimer);
2177 break;
2178 }
2179 case MFEMUL_WORK:{
2180 lbWORK: if (len == 0) break;
2181
2182 if (cardAUTHKEY == 0xff) {
2183 // first authentication
2184 if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) {
2185 authTimer = GetTickCount();
2186
2187 cardAUTHSC = receivedCmd[1] / 4; // received block num
2188 cardAUTHKEY = receivedCmd[0] - 0x60;
2189
2190 // --- crypto
2191 crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY));
2192 ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0);
2193 num_to_bytes(nonce, 4, rAUTH_AT);
2194 EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
2195 // --- crypto
2196
2197 // last working revision
2198 // EmSendCmd14443aRaw(resp1, resp1Len, 0);
2199 // LogTrace(NULL, 0, GetDeltaCountUS(), 0, true);
2200
2201 cardSTATE = MFEMUL_AUTH1;
2202 //nextCycleTimeout = 10;
2203 break;
2204 }
2205 } else {
2206 // decrypt seqence
2207 mf_crypto1_decrypt(pcs, receivedCmd, len);
2208
2209 // nested authentication
2210 if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) {
2211 authTimer = GetTickCount();
2212
2213 cardAUTHSC = receivedCmd[1] / 4; // received block num
2214 cardAUTHKEY = receivedCmd[0] - 0x60;
2215
2216 // --- crypto
2217 crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY));
2218 ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0);
2219 num_to_bytes(ans, 4, rAUTH_AT);
2220 EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
2221 // --- crypto
2222
2223 cardSTATE = MFEMUL_AUTH1;
2224 //nextCycleTimeout = 10;
2225 break;
2226 }
2227 }
2228
2229 // rule 13 of 7.5.3. in ISO 14443-4. chaining shall be continued
2230 // BUT... ACK --> NACK
2231 if (len == 1 && receivedCmd[0] == CARD_ACK) {
2232 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2233 break;
2234 }
2235
2236 // rule 12 of 7.5.3. in ISO 14443-4. R(NAK) --> R(ACK)
2237 if (len == 1 && receivedCmd[0] == CARD_NACK_NA) {
2238 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
2239 break;
2240 }
2241
2242 // read block
2243 if (len == 4 && receivedCmd[0] == 0x30) {
2244 if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) {
2245 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2246 break;
2247 }
2248 emlGetMem(response, receivedCmd[1], 1);
2249 AppendCrc14443a(response, 16);
2250 mf_crypto1_encrypt(pcs, response, 18, &par);
2251 EmSendCmdPar(response, 18, par);
2252 break;
2253 }
2254
2255 // write block
2256 if (len == 4 && receivedCmd[0] == 0xA0) {
2257 if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) {
2258 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2259 break;
2260 }
2261 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
2262 //nextCycleTimeout = 50;
2263 cardSTATE = MFEMUL_WRITEBL2;
2264 cardWRBL = receivedCmd[1];
2265 break;
2266 }
2267
2268 // works with cardINTREG
2269
2270 // increment, decrement, restore
2271 if (len == 4 && (receivedCmd[0] == 0xC0 || receivedCmd[0] == 0xC1 || receivedCmd[0] == 0xC2)) {
2272 if (receivedCmd[1] >= 16 * 4 ||
2273 receivedCmd[1] / 4 != cardAUTHSC ||
2274 emlCheckValBl(receivedCmd[1])) {
2275 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2276 break;
2277 }
2278 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
2279 if (receivedCmd[0] == 0xC1)
2280 cardSTATE = MFEMUL_INTREG_INC;
2281 if (receivedCmd[0] == 0xC0)
2282 cardSTATE = MFEMUL_INTREG_DEC;
2283 if (receivedCmd[0] == 0xC2)
2284 cardSTATE = MFEMUL_INTREG_REST;
2285 cardWRBL = receivedCmd[1];
2286
2287 break;
2288 }
2289
2290
2291 // transfer
2292 if (len == 4 && receivedCmd[0] == 0xB0) {
2293 if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) {
2294 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2295 break;
2296 }
2297
2298 if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd[1]))
2299 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2300 else
2301 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
2302
2303 break;
2304 }
2305
2306 // halt
2307 if (len == 4 && (receivedCmd[0] == 0x50 && receivedCmd[1] == 0x00)) {
2308 LED_B_OFF();
2309 LED_C_OFF();
2310 cardSTATE = MFEMUL_HALTED;
2311 if (MF_DBGLEVEL >= 4) Dbprintf("--> HALTED. Selected time: %d ms", GetTickCount() - selTimer);
2312 break;
2313 }
2314
2315 // command not allowed
2316 if (len == 4) {
2317 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2318 break;
2319 }
2320
2321 // case break
2322 break;
2323 }
2324 case MFEMUL_WRITEBL2:{
2325 if (len == 18){
2326 mf_crypto1_decrypt(pcs, receivedCmd, len);
2327 emlSetMem(receivedCmd, cardWRBL, 1);
2328 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
2329 cardSTATE = MFEMUL_WORK;
2330 break;
2331 } else {
2332 cardSTATE_TO_IDLE();
2333 break;
2334 }
2335 break;
2336 }
2337
2338 case MFEMUL_INTREG_INC:{
2339 mf_crypto1_decrypt(pcs, receivedCmd, len);
2340 memcpy(&ans, receivedCmd, 4);
2341 if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
2342 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2343 cardSTATE_TO_IDLE();
2344 break;
2345 }
2346 cardINTREG = cardINTREG + ans;
2347 cardSTATE = MFEMUL_WORK;
2348 break;
2349 }
2350 case MFEMUL_INTREG_DEC:{
2351 mf_crypto1_decrypt(pcs, receivedCmd, len);
2352 memcpy(&ans, receivedCmd, 4);
2353 if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
2354 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2355 cardSTATE_TO_IDLE();
2356 break;
2357 }
2358 cardINTREG = cardINTREG - ans;
2359 cardSTATE = MFEMUL_WORK;
2360 break;
2361 }
2362 case MFEMUL_INTREG_REST:{
2363 mf_crypto1_decrypt(pcs, receivedCmd, len);
2364 memcpy(&ans, receivedCmd, 4);
2365 if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
2366 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2367 cardSTATE_TO_IDLE();
2368 break;
2369 }
2370 cardSTATE = MFEMUL_WORK;
2371 break;
2372 }
2373 }
2374 }
2375
2376 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
2377 LEDsoff();
2378
2379 // add trace trailer
2380 memset(rAUTH_NT, 0x44, 4);
2381 LogTrace(rAUTH_NT, 4, 0, 0, TRUE);
2382
2383 if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, traceLen);
2384 }
2385
2386 //-----------------------------------------------------------------------------
2387 // MIFARE sniffer.
2388 //
2389 //-----------------------------------------------------------------------------
2390 void RAMFUNC SniffMifare(uint8_t param) {
2391 // param:
2392 // bit 0 - trigger from first card answer
2393 // bit 1 - trigger from first reader 7-bit request
2394
2395 // C(red) A(yellow) B(green)
2396 LEDsoff();
2397 // init trace buffer
2398 iso14a_clear_trace();
2399
2400 // The command (reader -> tag) that we're receiving.
2401 // The length of a received command will in most cases be no more than 18 bytes.
2402 // So 32 should be enough!
2403 uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
2404 // The response (tag -> reader) that we're receiving.
2405 uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET);
2406
2407 // As we receive stuff, we copy it from receivedCmd or receivedResponse
2408 // into trace, along with its length and other annotations.
2409 //uint8_t *trace = (uint8_t *)BigBuf;
2410
2411 // The DMA buffer, used to stream samples from the FPGA
2412 int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
2413 int8_t *data = dmaBuf;
2414 int maxDataLen = 0;
2415 int dataLen = 0;
2416
2417 // Set up the demodulator for tag -> reader responses.
2418 Demod.output = receivedResponse;
2419 Demod.len = 0;
2420 Demod.state = DEMOD_UNSYNCD;
2421
2422 // Set up the demodulator for the reader -> tag commands
2423 memset(&Uart, 0, sizeof(Uart));
2424 Uart.output = receivedCmd;
2425 Uart.byteCntMax = 32; // was 100 (greg)//////////////////
2426 Uart.state = STATE_UNSYNCD;
2427
2428 // Setup for the DMA.
2429 FpgaSetupSsc();
2430 FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
2431
2432 // And put the FPGA in the appropriate mode
2433 // Signal field is off with the appropriate LED
2434 LED_D_OFF();
2435 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
2436 SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
2437
2438 // init sniffer
2439 MfSniffInit();
2440 int sniffCounter = 0;
2441
2442 // And now we loop, receiving samples.
2443 while(true) {
2444 if(BUTTON_PRESS()) {
2445 DbpString("cancelled by button");
2446 goto done;
2447 }
2448
2449 LED_A_ON();
2450 WDT_HIT();
2451
2452 if (++sniffCounter > 65) {
2453 if (MfSniffSend(2000)) {
2454 FpgaEnableSscDma();
2455 }
2456 sniffCounter = 0;
2457 }
2458
2459 int register readBufDataP = data - dmaBuf;
2460 int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR;
2461 if (readBufDataP <= dmaBufDataP){
2462 dataLen = dmaBufDataP - readBufDataP;
2463 } else {
2464 dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP + 1;
2465 }
2466 // test for length of buffer
2467 if(dataLen > maxDataLen) {
2468 maxDataLen = dataLen;
2469 if(dataLen > 400) {
2470 Dbprintf("blew circular buffer! dataLen=0x%x", dataLen);
2471 goto done;
2472 }
2473 }
2474 if(dataLen < 1) continue;
2475
2476 // primary buffer was stopped( <-- we lost data!
2477 if (!AT91C_BASE_PDC_SSC->PDC_RCR) {
2478 AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf;
2479 AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE;
2480 Dbprintf("RxEmpty ERROR!!! data length:%d", dataLen); // temporary
2481 }
2482 // secondary buffer sets as primary, secondary buffer was stopped
2483 if (!AT91C_BASE_PDC_SSC->PDC_RNCR) {
2484 AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
2485 AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
2486 }
2487
2488 LED_A_OFF();
2489
2490 if(MillerDecoding((data[0] & 0xF0) >> 4)) {
2491 LED_C_INV();
2492 // check - if there is a short 7bit request from reader
2493 if (MfSniffLogic(receivedCmd, Uart.byteCnt, Uart.parityBits, Uart.bitCnt, TRUE)) break;
2494
2495 /* And ready to receive another command. */
2496 Uart.state = STATE_UNSYNCD;
2497
2498 /* And also reset the demod code */
2499 Demod.state = DEMOD_UNSYNCD;
2500 }
2501
2502 if(ManchesterDecoding(data[0] & 0x0F)) {
2503 LED_C_INV();
2504
2505 if (MfSniffLogic(receivedResponse, Demod.len, Demod.parityBits, Demod.bitCount, FALSE)) break;
2506
2507 // And ready to receive another response.
2508 memset(&Demod, 0, sizeof(Demod));
2509 Demod.output = receivedResponse;
2510 Demod.state = DEMOD_UNSYNCD;
2511
2512 /* And also reset the uart code */
2513 Uart.state = STATE_UNSYNCD;
2514 }
2515
2516 data++;
2517 if(data > dmaBuf + DMA_BUFFER_SIZE) {
2518 data = dmaBuf;
2519 }
2520 } // main cycle
2521
2522 DbpString("COMMAND FINISHED");
2523
2524 done:
2525 FpgaDisableSscDma();
2526 MfSniffEnd();
2527
2528 Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.byteCnt=%x Uart.byteCntMax=%x", maxDataLen, Uart.state, Uart.byteCnt, Uart.byteCntMax);
2529 LEDsoff();
2530 }
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