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fixed possibly uninitialized variables
[proxmark3-svn] / armsrc / iso14443a.c
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
902 static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded);
903 int EmSend4bitEx(uint8_t resp, int correctionNeeded);
904 int EmSend4bit(uint8_t resp);
905 int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par);
906 int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par);
907 int EmSendCmdEx(uint8_t *resp, int respLen, int correctionNeeded);
908 int EmSendCmd(uint8_t *resp, int respLen);
909 int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par);
910
911 //-----------------------------------------------------------------------------
912 // Main loop of simulated tag: receive commands from reader, decide what
913 // response to send, and send it.
914 //-----------------------------------------------------------------------------
915 void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
916 {
917 // Enable and clear the trace
918 tracing = TRUE;
919 iso14a_clear_trace();
920
921 // This function contains the tag emulation
922 uint8_t sak;
923
924 // The first response contains the ATQA (note: bytes are transmitted in reverse order).
925 uint8_t response1[2];
926
927 switch (tagType) {
928 case 1: { // MIFARE Classic
929 // Says: I am Mifare 1k - original line
930 response1[0] = 0x04;
931 response1[1] = 0x00;
932 sak = 0x08;
933 } break;
934 case 2: { // MIFARE Ultralight
935 // Says: I am a stupid memory tag, no crypto
936 response1[0] = 0x04;
937 response1[1] = 0x00;
938 sak = 0x00;
939 } break;
940 case 3: { // MIFARE DESFire
941 // Says: I am a DESFire tag, ph33r me
942 response1[0] = 0x04;
943 response1[1] = 0x03;
944 sak = 0x20;
945 } break;
946 case 4: { // ISO/IEC 14443-4
947 // Says: I am a javacard (JCOP)
948 response1[0] = 0x04;
949 response1[1] = 0x00;
950 sak = 0x28;
951 } break;
952 default: {
953 Dbprintf("Error: unkown tagtype (%d)",tagType);
954 return;
955 } break;
956 }
957
958 // The second response contains the (mandatory) first 24 bits of the UID
959 uint8_t response2[5];
960
961 // Check if the uid uses the (optional) part
962 uint8_t response2a[5];
963 if (uid_2nd) {
964 response2[0] = 0x88;
965 num_to_bytes(uid_1st,3,response2+1);
966 num_to_bytes(uid_2nd,4,response2a);
967 response2a[4] = response2a[0] ^ response2a[1] ^ response2a[2] ^ response2a[3];
968
969 // Configure the ATQA and SAK accordingly
970 response1[0] |= 0x40;
971 sak |= 0x04;
972 } else {
973 num_to_bytes(uid_1st,4,response2);
974 // Configure the ATQA and SAK accordingly
975 response1[0] &= 0xBF;
976 sak &= 0xFB;
977 }
978
979 // Calculate the BitCountCheck (BCC) for the first 4 bytes of the UID.
980 response2[4] = response2[0] ^ response2[1] ^ response2[2] ^ response2[3];
981
982 // Prepare the mandatory SAK (for 4 and 7 byte UID)
983 uint8_t response3[3];
984 response3[0] = sak;
985 ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]);
986
987 // Prepare the optional second SAK (for 7 byte UID), drop the cascade bit
988 uint8_t response3a[3];
989 response3a[0] = sak & 0xFB;
990 ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
991
992 uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce
993 uint8_t response6[] = { 0x03, 0x3B, 0x00, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS
994 ComputeCrc14443(CRC_14443_A, response6, 3, &response6[3], &response6[4]);
995
996 uint8_t *resp = NULL;
997 int respLen;
998
999 // Longest possible response will be 16 bytes + 2 CRC = 18 bytes
1000 // This will need
1001 // 144 data bits (18 * 8)
1002 // 18 parity bits
1003 // 2 Start and stop
1004 // 1 Correction bit (Answer in 1172 or 1236 periods, see FPGA)
1005 // 1 just for the case
1006 // ----------- +
1007 // 166
1008 //
1009 // 166 bytes, since every bit that needs to be send costs us a byte
1010 //
1011
1012 // Respond with card type
1013 uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
1014 int resp1Len;
1015
1016 // Anticollision cascade1 - respond with uid
1017 uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 166);
1018 int resp2Len;
1019
1020 // Anticollision cascade2 - respond with 2nd half of uid if asked
1021 // we're only going to be asked if we set the 1st byte of the UID (during cascade1) to 0x88
1022 uint8_t *resp2a = (((uint8_t *)BigBuf) + 1140);
1023 int resp2aLen;
1024
1025 // Acknowledge select - cascade 1
1026 uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*2));
1027 int resp3Len;
1028
1029 // Acknowledge select - cascade 2
1030 uint8_t *resp3a = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*3));
1031 int resp3aLen;
1032
1033 // Response to a read request - not implemented atm
1034 uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*4));
1035 // int resp4Len;
1036
1037 // Authenticate response - nonce
1038 uint8_t *resp5 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*5));
1039 int resp5Len;
1040
1041 // Authenticate response - nonce
1042 uint8_t *resp6 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*6));
1043 int resp6Len;
1044
1045 uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
1046 int len;
1047
1048 // To control where we are in the protocol
1049 int order = 0;
1050 int lastorder;
1051
1052 // Just to allow some checks
1053 int happened = 0;
1054 int happened2 = 0;
1055
1056 int cmdsRecvd = 0;
1057 uint8_t* respdata = NULL;
1058 int respsize = 0;
1059 // uint8_t nack = 0x04;
1060
1061 memset(receivedCmd, 0x44, RECV_CMD_SIZE);
1062
1063 // Prepare the responses of the anticollision phase
1064 // there will be not enough time to do this at the moment the reader sends it REQA
1065
1066 // Answer to request
1067 CodeIso14443aAsTag(response1, sizeof(response1));
1068 memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
1069
1070 // Send our UID (cascade 1)
1071 CodeIso14443aAsTag(response2, sizeof(response2));
1072 memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax;
1073
1074 // Answer to select (cascade1)
1075 CodeIso14443aAsTag(response3, sizeof(response3));
1076 memcpy(resp3, ToSend, ToSendMax); resp3Len = ToSendMax;
1077
1078 // Send the cascade 2 2nd part of the uid
1079 CodeIso14443aAsTag(response2a, sizeof(response2a));
1080 memcpy(resp2a, ToSend, ToSendMax); resp2aLen = ToSendMax;
1081
1082 // Answer to select (cascade 2)
1083 CodeIso14443aAsTag(response3a, sizeof(response3a));
1084 memcpy(resp3a, ToSend, ToSendMax); resp3aLen = ToSendMax;
1085
1086 // Strange answer is an example of rare message size (3 bits)
1087 CodeStrangeAnswerAsTag();
1088 memcpy(resp4, ToSend, ToSendMax);// resp4Len = ToSendMax;
1089
1090 // Authentication answer (random nonce)
1091 CodeIso14443aAsTag(response5, sizeof(response5));
1092 memcpy(resp5, ToSend, ToSendMax); resp5Len = ToSendMax;
1093
1094 // dummy ATS (pseudo-ATR), answer to RATS
1095 CodeIso14443aAsTag(response6, sizeof(response6));
1096 memcpy(resp6, ToSend, ToSendMax); resp6Len = ToSendMax;
1097
1098 // We need to listen to the high-frequency, peak-detected path.
1099 SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1100 FpgaSetupSsc();
1101
1102 cmdsRecvd = 0;
1103
1104 LED_A_ON();
1105 for(;;) {
1106
1107 if(!GetIso14443aCommandFromReader(receivedCmd, &len, RECV_CMD_SIZE)) {
1108 DbpString("button press");
1109 break;
1110 }
1111
1112 if (tracing) {
1113 LogTrace(receivedCmd,len, 0, Uart.parityBits, TRUE);
1114 }
1115
1116 // 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
1117 // Okay, look at the command now.
1118 lastorder = order;
1119 if(receivedCmd[0] == 0x26) { // Received a REQUEST
1120 resp = resp1; respLen = resp1Len; order = 1;
1121 respdata = response1;
1122 respsize = sizeof(response1);
1123 } else if(receivedCmd[0] == 0x52) { // Received a WAKEUP
1124 resp = resp1; respLen = resp1Len; order = 6;
1125 respdata = response1;
1126 respsize = sizeof(response1);
1127 } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x93) { // Received request for UID (cascade 1)
1128 resp = resp2; respLen = resp2Len; order = 2;
1129 respdata = response2;
1130 respsize = sizeof(response2);
1131 } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x95) { // Received request for UID (cascade 2)
1132 resp = resp2a; respLen = resp2aLen; order = 20;
1133 respdata = response2a;
1134 respsize = sizeof(response2a);
1135 } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x93) { // Received a SELECT (cascade 1)
1136 resp = resp3; respLen = resp3Len; order = 3;
1137 respdata = response3;
1138 respsize = sizeof(response3);
1139 } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x95) { // Received a SELECT (cascade 2)
1140 resp = resp3a; respLen = resp3aLen; order = 30;
1141 respdata = response3a;
1142 respsize = sizeof(response3a);
1143 } else if(receivedCmd[0] == 0x30) { // Received a (plain) READ
1144 // resp = resp4; respLen = resp4Len; order = 4; // Do nothing
1145 // respdata = &nack;
1146 // respsize = sizeof(nack); // 4-bit answer
1147 EmSendCmdEx(data+(4*receivedCmd[0]),16,false);
1148 Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]);
1149 // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
1150 respLen = 0;
1151 } else if(receivedCmd[0] == 0x50) { // Received a HALT
1152 // DbpString("Reader requested we HALT!:");
1153 // Do not respond
1154 resp = resp1; respLen = 0; order = 0;
1155 respdata = NULL;
1156 respsize = 0;
1157 } else if(receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61) { // Received an authentication request
1158 resp = resp5; respLen = resp5Len; order = 7;
1159 respdata = response5;
1160 respsize = sizeof(response5);
1161 } else if(receivedCmd[0] == 0xE0) { // Received a RATS request
1162 resp = resp6; respLen = resp6Len; order = 70;
1163 respdata = response6;
1164 respsize = sizeof(response6);
1165 } else {
1166 if (order == 7 && len ==8) {
1167 uint32_t nr = bytes_to_num(receivedCmd,4);
1168 uint32_t ar = bytes_to_num(receivedCmd+4,4);
1169 Dbprintf("Auth attempt {nr}{ar}: %08x %08x",nr,ar);
1170 } else {
1171 // Never seen this command before
1172 Dbprintf("Received unknown command (len=%d):",len);
1173 Dbhexdump(len,receivedCmd,false);
1174 }
1175 // Do not respond
1176 resp = resp1; respLen = 0; order = 0;
1177 respdata = NULL;
1178 respsize = 0;
1179 }
1180
1181 // Count number of wakeups received after a halt
1182 if(order == 6 && lastorder == 5) { happened++; }
1183
1184 // Count number of other messages after a halt
1185 if(order != 6 && lastorder == 5) { happened2++; }
1186
1187 // Look at last parity bit to determine timing of answer
1188 if((Uart.parityBits & 0x01) || receivedCmd[0] == 0x52) {
1189 // 1236, so correction bit needed
1190 //i = 0;
1191 }
1192
1193 if(cmdsRecvd > 999) {
1194 DbpString("1000 commands later...");
1195 break;
1196 } else {
1197 cmdsRecvd++;
1198 }
1199
1200 if(respLen > 0) {
1201 EmSendCmd14443aRaw(resp, respLen, receivedCmd[0] == 0x52);
1202 }
1203
1204 if (tracing) {
1205 if (respdata != NULL) {
1206 LogTrace(respdata,respsize, 0, SwapBits(GetParity(respdata,respsize),respsize), FALSE);
1207 }
1208 if(traceLen > TRACE_SIZE) {
1209 DbpString("Trace full");
1210 break;
1211 }
1212 }
1213
1214 memset(receivedCmd, 0x44, RECV_CMD_SIZE);
1215 }
1216
1217 Dbprintf("%x %x %x", happened, happened2, cmdsRecvd);
1218 LED_A_OFF();
1219 }
1220
1221 //-----------------------------------------------------------------------------
1222 // Transmit the command (to the tag) that was placed in ToSend[].
1223 //-----------------------------------------------------------------------------
1224 static void TransmitFor14443a(const uint8_t *cmd, int len, int *samples, int *wait)
1225 {
1226 int c;
1227
1228 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1229
1230 if (wait)
1231 if(*wait < 10)
1232 *wait = 10;
1233
1234 for(c = 0; c < *wait;) {
1235 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1236 AT91C_BASE_SSC->SSC_THR = 0x00; // For exact timing!
1237 c++;
1238 }
1239 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1240 volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
1241 (void)r;
1242 }
1243 WDT_HIT();
1244 }
1245
1246 c = 0;
1247 for(;;) {
1248 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1249 AT91C_BASE_SSC->SSC_THR = cmd[c];
1250 c++;
1251 if(c >= len) {
1252 break;
1253 }
1254 }
1255 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1256 volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
1257 (void)r;
1258 }
1259 WDT_HIT();
1260 }
1261 if (samples) *samples = (c + *wait) << 3;
1262 }
1263
1264 //-----------------------------------------------------------------------------
1265 // Prepare reader command (in bits, support short frames) to send to FPGA
1266 //-----------------------------------------------------------------------------
1267 void CodeIso14443aBitsAsReaderPar(const uint8_t * cmd, int bits, uint32_t dwParity)
1268 {
1269 int i, j;
1270 int last;
1271 uint8_t b;
1272
1273 ToSendReset();
1274
1275 // Start of Communication (Seq. Z)
1276 ToSend[++ToSendMax] = SEC_Z;
1277 last = 0;
1278
1279 size_t bytecount = nbytes(bits);
1280 // Generate send structure for the data bits
1281 for (i = 0; i < bytecount; i++) {
1282 // Get the current byte to send
1283 b = cmd[i];
1284 size_t bitsleft = MIN((bits-(i*8)),8);
1285
1286 for (j = 0; j < bitsleft; j++) {
1287 if (b & 1) {
1288 // Sequence X
1289 ToSend[++ToSendMax] = SEC_X;
1290 last = 1;
1291 } else {
1292 if (last == 0) {
1293 // Sequence Z
1294 ToSend[++ToSendMax] = SEC_Z;
1295 } else {
1296 // Sequence Y
1297 ToSend[++ToSendMax] = SEC_Y;
1298 last = 0;
1299 }
1300 }
1301 b >>= 1;
1302 }
1303
1304 // Only transmit (last) parity bit if we transmitted a complete byte
1305 if (j == 8) {
1306 // Get the parity bit
1307 if ((dwParity >> i) & 0x01) {
1308 // Sequence X
1309 ToSend[++ToSendMax] = SEC_X;
1310 last = 1;
1311 } else {
1312 if (last == 0) {
1313 // Sequence Z
1314 ToSend[++ToSendMax] = SEC_Z;
1315 } else {
1316 // Sequence Y
1317 ToSend[++ToSendMax] = SEC_Y;
1318 last = 0;
1319 }
1320 }
1321 }
1322 }
1323
1324 // End of Communication
1325 if (last == 0) {
1326 // Sequence Z
1327 ToSend[++ToSendMax] = SEC_Z;
1328 } else {
1329 // Sequence Y
1330 ToSend[++ToSendMax] = SEC_Y;
1331 last = 0;
1332 }
1333 // Sequence Y
1334 ToSend[++ToSendMax] = SEC_Y;
1335
1336 // Just to be sure!
1337 ToSend[++ToSendMax] = SEC_Y;
1338 ToSend[++ToSendMax] = SEC_Y;
1339 ToSend[++ToSendMax] = SEC_Y;
1340
1341 // Convert from last character reference to length
1342 ToSendMax++;
1343 }
1344
1345 //-----------------------------------------------------------------------------
1346 // Prepare reader command to send to FPGA
1347 //-----------------------------------------------------------------------------
1348 void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity)
1349 {
1350 CodeIso14443aBitsAsReaderPar(cmd,len*8,dwParity);
1351 }
1352
1353 //-----------------------------------------------------------------------------
1354 // Wait for commands from reader
1355 // Stop when button is pressed (return 1) or field was gone (return 2)
1356 // Or return 0 when command is captured
1357 //-----------------------------------------------------------------------------
1358 static int EmGetCmd(uint8_t *received, int *len, int maxLen)
1359 {
1360 *len = 0;
1361
1362 uint32_t timer = 0, vtime = 0;
1363 int analogCnt = 0;
1364 int analogAVG = 0;
1365
1366 // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen
1367 // only, since we are receiving, not transmitting).
1368 // Signal field is off with the appropriate LED
1369 LED_D_OFF();
1370 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
1371
1372 // Set ADC to read field strength
1373 AT91C_BASE_ADC->ADC_CR = AT91C_ADC_SWRST;
1374 AT91C_BASE_ADC->ADC_MR =
1375 ADC_MODE_PRESCALE(32) |
1376 ADC_MODE_STARTUP_TIME(16) |
1377 ADC_MODE_SAMPLE_HOLD_TIME(8);
1378 AT91C_BASE_ADC->ADC_CHER = ADC_CHANNEL(ADC_CHAN_HF);
1379 // start ADC
1380 AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
1381
1382 // Now run a 'software UART' on the stream of incoming samples.
1383 Uart.output = received;
1384 Uart.byteCntMax = maxLen;
1385 Uart.state = STATE_UNSYNCD;
1386
1387 for(;;) {
1388 WDT_HIT();
1389
1390 if (BUTTON_PRESS()) return 1;
1391
1392 // test if the field exists
1393 if (AT91C_BASE_ADC->ADC_SR & ADC_END_OF_CONVERSION(ADC_CHAN_HF)) {
1394 analogCnt++;
1395 analogAVG += AT91C_BASE_ADC->ADC_CDR[ADC_CHAN_HF];
1396 AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
1397 if (analogCnt >= 32) {
1398 if ((33000 * (analogAVG / analogCnt) >> 10) < MF_MINFIELDV) {
1399 vtime = GetTickCount();
1400 if (!timer) timer = vtime;
1401 // 50ms no field --> card to idle state
1402 if (vtime - timer > 50) return 2;
1403 } else
1404 if (timer) timer = 0;
1405 analogCnt = 0;
1406 analogAVG = 0;
1407 }
1408 }
1409 // transmit none
1410 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1411 AT91C_BASE_SSC->SSC_THR = 0x00;
1412 }
1413 // receive and test the miller decoding
1414 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1415 volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
1416 if(MillerDecoding((b & 0xf0) >> 4)) {
1417 *len = Uart.byteCnt;
1418 if (tracing) LogTrace(received, *len, GetDeltaCountUS(), Uart.parityBits, TRUE);
1419 return 0;
1420 }
1421 if(MillerDecoding(b & 0x0f)) {
1422 *len = Uart.byteCnt;
1423 if (tracing) LogTrace(received, *len, GetDeltaCountUS(), Uart.parityBits, TRUE);
1424 return 0;
1425 }
1426 }
1427 }
1428 }
1429
1430 static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded)
1431 {
1432 int i, u = 0;
1433 uint8_t b = 0;
1434
1435 // Modulate Manchester
1436 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD);
1437 AT91C_BASE_SSC->SSC_THR = 0x00;
1438 FpgaSetupSsc();
1439
1440 // include correction bit
1441 i = 1;
1442 if((Uart.parityBits & 0x01) || correctionNeeded) {
1443 // 1236, so correction bit needed
1444 i = 0;
1445 }
1446
1447 // send cycle
1448 for(;;) {
1449 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1450 volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
1451 (void)b;
1452 }
1453 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1454 if(i > respLen) {
1455 b = 0xff; // was 0x00
1456 u++;
1457 } else {
1458 b = resp[i];
1459 i++;
1460 }
1461 AT91C_BASE_SSC->SSC_THR = b;
1462
1463 if(u > 4) break;
1464 }
1465 if(BUTTON_PRESS()) {
1466 break;
1467 }
1468 }
1469
1470 return 0;
1471 }
1472
1473 int EmSend4bitEx(uint8_t resp, int correctionNeeded){
1474 Code4bitAnswerAsTag(resp);
1475 int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded);
1476 if (tracing) LogTrace(&resp, 1, GetDeltaCountUS(), GetParity(&resp, 1), FALSE);
1477 return res;
1478 }
1479
1480 int EmSend4bit(uint8_t resp){
1481 return EmSend4bitEx(resp, 0);
1482 }
1483
1484 int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par){
1485 CodeIso14443aAsTagPar(resp, respLen, par);
1486 int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded);
1487 if (tracing) LogTrace(resp, respLen, GetDeltaCountUS(), par, FALSE);
1488 return res;
1489 }
1490
1491 int EmSendCmdEx(uint8_t *resp, int respLen, int correctionNeeded){
1492 return EmSendCmdExPar(resp, respLen, correctionNeeded, GetParity(resp, respLen));
1493 }
1494
1495 int EmSendCmd(uint8_t *resp, int respLen){
1496 return EmSendCmdExPar(resp, respLen, 0, GetParity(resp, respLen));
1497 }
1498
1499 int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par){
1500 return EmSendCmdExPar(resp, respLen, 0, par);
1501 }
1502
1503 //-----------------------------------------------------------------------------
1504 // Wait a certain time for tag response
1505 // If a response is captured return TRUE
1506 // If it takes to long return FALSE
1507 //-----------------------------------------------------------------------------
1508 static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) //uint8_t *buffer
1509 {
1510 // buffer needs to be 512 bytes
1511 int c;
1512
1513 // Set FPGA mode to "reader listen mode", no modulation (listen
1514 // only, since we are receiving, not transmitting).
1515 // Signal field is on with the appropriate LED
1516 LED_D_ON();
1517 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN);
1518
1519 // Now get the answer from the card
1520 Demod.output = receivedResponse;
1521 Demod.len = 0;
1522 Demod.state = DEMOD_UNSYNCD;
1523
1524 uint8_t b;
1525 if (elapsed) *elapsed = 0;
1526
1527 c = 0;
1528 for(;;) {
1529 WDT_HIT();
1530
1531 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
1532 AT91C_BASE_SSC->SSC_THR = 0x00; // To make use of exact timing of next command from reader!!
1533 if (elapsed) (*elapsed)++;
1534 }
1535 if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
1536 if(c < iso14a_timeout) { c++; } else { return FALSE; }
1537 b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
1538 if(ManchesterDecoding((b>>4) & 0xf)) {
1539 *samples = ((c - 1) << 3) + 4;
1540 return TRUE;
1541 }
1542 if(ManchesterDecoding(b & 0x0f)) {
1543 *samples = c << 3;
1544 return TRUE;
1545 }
1546 }
1547 }
1548 }
1549
1550 void ReaderTransmitBitsPar(uint8_t* frame, int bits, uint32_t par)
1551 {
1552 int wait = 0;
1553 int samples = 0;
1554
1555 // This is tied to other size changes
1556 // uint8_t* frame_addr = ((uint8_t*)BigBuf) + 2024;
1557 CodeIso14443aBitsAsReaderPar(frame,bits,par);
1558
1559 // Select the card
1560 TransmitFor14443a(ToSend, ToSendMax, &samples, &wait);
1561 if(trigger)
1562 LED_A_ON();
1563
1564 // Store reader command in buffer
1565 if (tracing) LogTrace(frame,nbytes(bits),0,par,TRUE);
1566 }
1567
1568 void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par)
1569 {
1570 ReaderTransmitBitsPar(frame,len*8,par);
1571 }
1572
1573 void ReaderTransmit(uint8_t* frame, int len)
1574 {
1575 // Generate parity and redirect
1576 ReaderTransmitBitsPar(frame,len*8,GetParity(frame,len));
1577 }
1578
1579 int ReaderReceive(uint8_t* receivedAnswer)
1580 {
1581 int samples = 0;
1582 if (!GetIso14443aAnswerFromTag(receivedAnswer,160,&samples,0)) return FALSE;
1583 if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE);
1584 if(samples == 0) return FALSE;
1585 return Demod.len;
1586 }
1587
1588 int ReaderReceivePar(uint8_t* receivedAnswer, uint32_t * parptr)
1589 {
1590 int samples = 0;
1591 if (!GetIso14443aAnswerFromTag(receivedAnswer,160,&samples,0)) return FALSE;
1592 if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE);
1593 *parptr = Demod.parityBits;
1594 if(samples == 0) return FALSE;
1595 return Demod.len;
1596 }
1597
1598 /* performs iso14443a anticolision procedure
1599 * fills the uid pointer unless NULL
1600 * fills resp_data unless NULL */
1601 int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, uint32_t* cuid_ptr) {
1602 uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP
1603 uint8_t sel_all[] = { 0x93,0x20 };
1604 uint8_t sel_uid[] = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
1605 uint8_t rats[] = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0
1606 uint8_t* resp = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); // was 3560 - tied to other size changes
1607 byte_t uid_resp[4];
1608 size_t uid_resp_len;
1609
1610 uint8_t sak = 0x04; // cascade uid
1611 int cascade_level = 0;
1612 int len;
1613
1614 // Broadcast for a card, WUPA (0x52) will force response from all cards in the field
1615 ReaderTransmitBitsPar(wupa,7,0);
1616 // Receive the ATQA
1617 if(!ReaderReceive(resp)) return 0;
1618 // Dbprintf("atqa: %02x %02x",resp[0],resp[1]);
1619
1620 if(p_hi14a_card) {
1621 memcpy(p_hi14a_card->atqa, resp, 2);
1622 p_hi14a_card->uidlen = 0;
1623 memset(p_hi14a_card->uid,0,10);
1624 }
1625
1626 // clear uid
1627 if (uid_ptr) {
1628 memset(uid_ptr,0,10);
1629 }
1630
1631 // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in
1632 // which case we need to make a cascade 2 request and select - this is a long UID
1633 // While the UID is not complete, the 3nd bit (from the right) is set in the SAK.
1634 for(; sak & 0x04; cascade_level++)
1635 {
1636 // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97)
1637 sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2;
1638
1639 // SELECT_ALL
1640 ReaderTransmit(sel_all,sizeof(sel_all));
1641 if (!ReaderReceive(resp)) return 0;
1642
1643 // First backup the current uid
1644 memcpy(uid_resp,resp,4);
1645 uid_resp_len = 4;
1646 // Dbprintf("uid: %02x %02x %02x %02x",uid_resp[0],uid_resp[1],uid_resp[2],uid_resp[3]);
1647
1648 // calculate crypto UID
1649 if(cuid_ptr) {
1650 *cuid_ptr = bytes_to_num(uid_resp, 4);
1651 }
1652
1653 // Construct SELECT UID command
1654 memcpy(sel_uid+2,resp,5);
1655 AppendCrc14443a(sel_uid,7);
1656 ReaderTransmit(sel_uid,sizeof(sel_uid));
1657
1658 // Receive the SAK
1659 if (!ReaderReceive(resp)) return 0;
1660 sak = resp[0];
1661
1662 // Test if more parts of the uid are comming
1663 if ((sak & 0x04) && uid_resp[0] == 0x88) {
1664 // Remove first byte, 0x88 is not an UID byte, it CT, see page 3 of:
1665 // http://www.nxp.com/documents/application_note/AN10927.pdf
1666 memcpy(uid_ptr, uid_ptr + 1, 3);
1667 uid_resp_len = 3;
1668 }
1669
1670 if(uid_ptr) {
1671 memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len);
1672 }
1673
1674 if(p_hi14a_card) {
1675 memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len);
1676 p_hi14a_card->uidlen += uid_resp_len;
1677 }
1678 }
1679
1680 if(p_hi14a_card) {
1681 p_hi14a_card->sak = sak;
1682 p_hi14a_card->ats_len = 0;
1683 }
1684
1685 if( (sak & 0x20) == 0) {
1686 return 2; // non iso14443a compliant tag
1687 }
1688
1689 // Request for answer to select
1690 AppendCrc14443a(rats, 2);
1691 ReaderTransmit(rats, sizeof(rats));
1692
1693 if (!(len = ReaderReceive(resp))) return 0;
1694
1695 if(p_hi14a_card) {
1696 memcpy(p_hi14a_card->ats, resp, sizeof(p_hi14a_card->ats));
1697 p_hi14a_card->ats_len = len;
1698 }
1699
1700 // reset the PCB block number
1701 iso14_pcb_blocknum = 0;
1702 return 1;
1703 }
1704
1705 void iso14443a_setup() {
1706 // Set up the synchronous serial port
1707 FpgaSetupSsc();
1708 // Start from off (no field generated)
1709 // Signal field is off with the appropriate LED
1710 LED_D_OFF();
1711 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1712 SpinDelay(50);
1713
1714 SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
1715
1716 // Now give it time to spin up.
1717 // Signal field is on with the appropriate LED
1718 LED_D_ON();
1719 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1720 SpinDelay(50);
1721
1722 iso14a_timeout = 2048; //default
1723 }
1724
1725 int iso14_apdu(uint8_t * cmd, size_t cmd_len, void * data) {
1726 uint8_t real_cmd[cmd_len+4];
1727 real_cmd[0] = 0x0a; //I-Block
1728 // put block number into the PCB
1729 real_cmd[0] |= iso14_pcb_blocknum;
1730 real_cmd[1] = 0x00; //CID: 0 //FIXME: allow multiple selected cards
1731 memcpy(real_cmd+2, cmd, cmd_len);
1732 AppendCrc14443a(real_cmd,cmd_len+2);
1733
1734 ReaderTransmit(real_cmd, cmd_len+4);
1735 size_t len = ReaderReceive(data);
1736 uint8_t * data_bytes = (uint8_t *) data;
1737 if (!len)
1738 return 0; //DATA LINK ERROR
1739 // if we received an I- or R(ACK)-Block with a block number equal to the
1740 // current block number, toggle the current block number
1741 else if (len >= 4 // PCB+CID+CRC = 4 bytes
1742 && ((data_bytes[0] & 0xC0) == 0 // I-Block
1743 || (data_bytes[0] & 0xD0) == 0x80) // R-Block with ACK bit set to 0
1744 && (data_bytes[0] & 0x01) == iso14_pcb_blocknum) // equal block numbers
1745 {
1746 iso14_pcb_blocknum ^= 1;
1747 }
1748
1749 return len;
1750 }
1751
1752 //-----------------------------------------------------------------------------
1753 // Read an ISO 14443a tag. Send out commands and store answers.
1754 //
1755 //-----------------------------------------------------------------------------
1756 void ReaderIso14443a(UsbCommand * c)
1757 {
1758 iso14a_command_t param = c->arg[0];
1759 uint8_t * cmd = c->d.asBytes;
1760 size_t len = c->arg[1];
1761 uint32_t arg0 = 0;
1762 byte_t buf[USB_CMD_DATA_SIZE];
1763
1764 iso14a_clear_trace();
1765 iso14a_set_tracing(true);
1766
1767 if(param & ISO14A_REQUEST_TRIGGER) {
1768 iso14a_set_trigger(1);
1769 }
1770
1771 if(param & ISO14A_CONNECT) {
1772 iso14443a_setup();
1773 arg0 = iso14443a_select_card(NULL,(iso14a_card_select_t*)buf,NULL);
1774 cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(iso14a_card_select_t));
1775 // UsbSendPacket((void *)ack, sizeof(UsbCommand));
1776 }
1777
1778 if(param & ISO14A_SET_TIMEOUT) {
1779 iso14a_timeout = c->arg[2];
1780 }
1781
1782 if(param & ISO14A_SET_TIMEOUT) {
1783 iso14a_timeout = c->arg[2];
1784 }
1785
1786 if(param & ISO14A_APDU) {
1787 arg0 = iso14_apdu(cmd, len, buf);
1788 cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf));
1789 // UsbSendPacket((void *)ack, sizeof(UsbCommand));
1790 }
1791
1792 if(param & ISO14A_RAW) {
1793 if(param & ISO14A_APPEND_CRC) {
1794 AppendCrc14443a(cmd,len);
1795 len += 2;
1796 }
1797 ReaderTransmit(cmd,len);
1798 arg0 = ReaderReceive(buf);
1799 // UsbSendPacket((void *)ack, sizeof(UsbCommand));
1800 cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf));
1801 }
1802
1803 if(param & ISO14A_REQUEST_TRIGGER) {
1804 iso14a_set_trigger(0);
1805 }
1806
1807 if(param & ISO14A_NO_DISCONNECT) {
1808 return;
1809 }
1810
1811 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1812 LEDsoff();
1813 }
1814
1815 //-----------------------------------------------------------------------------
1816 // Read an ISO 14443a tag. Send out commands and store answers.
1817 //
1818 //-----------------------------------------------------------------------------
1819 void ReaderMifare(uint32_t parameter)
1820 {
1821 // Mifare AUTH
1822 uint8_t mf_auth[] = { 0x60,0x00,0xf5,0x7b };
1823 uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
1824
1825 uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); // was 3560 - tied to other size changes
1826 traceLen = 0;
1827 tracing = false;
1828
1829 iso14443a_setup();
1830
1831 LED_A_ON();
1832 LED_B_OFF();
1833 LED_C_OFF();
1834
1835 byte_t nt_diff = 0;
1836 LED_A_OFF();
1837 byte_t par = 0;
1838 //byte_t par_mask = 0xff;
1839 byte_t par_low = 0;
1840 int led_on = TRUE;
1841 uint8_t uid[8];
1842 uint32_t cuid;
1843
1844 tracing = FALSE;
1845 byte_t nt[4] = {0,0,0,0};
1846 byte_t nt_attacked[4], nt_noattack[4];
1847 byte_t par_list[8] = {0,0,0,0,0,0,0,0};
1848 byte_t ks_list[8] = {0,0,0,0,0,0,0,0};
1849 num_to_bytes(parameter, 4, nt_noattack);
1850 int isOK = 0, isNULL = 0;
1851
1852 while(TRUE)
1853 {
1854 LED_C_OFF();
1855 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1856 SpinDelay(50);
1857 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
1858 LED_C_ON();
1859 SpinDelay(2);
1860
1861 // Test if the action was cancelled
1862 if(BUTTON_PRESS()) {
1863 break;
1864 }
1865
1866 if(!iso14443a_select_card(uid, NULL, &cuid)) continue;
1867
1868 // Transmit MIFARE_CLASSIC_AUTH
1869 ReaderTransmit(mf_auth, sizeof(mf_auth));
1870
1871 // Receive the (16 bit) "random" nonce
1872 if (!ReaderReceive(receivedAnswer)) continue;
1873 memcpy(nt, receivedAnswer, 4);
1874
1875 // Transmit reader nonce and reader answer
1876 ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar),par);
1877
1878 // Receive 4 bit answer
1879 if (ReaderReceive(receivedAnswer))
1880 {
1881 if ( (parameter != 0) && (memcmp(nt, nt_noattack, 4) == 0) ) continue;
1882
1883 isNULL = !(nt_attacked[0] == 0) && (nt_attacked[1] == 0) && (nt_attacked[2] == 0) && (nt_attacked[3] == 0);
1884 if ( (isNULL != 0 ) && (memcmp(nt, nt_attacked, 4) != 0) ) continue;
1885
1886 if (nt_diff == 0)
1887 {
1888 LED_A_ON();
1889 memcpy(nt_attacked, nt, 4);
1890 //par_mask = 0xf8;
1891 par_low = par & 0x07;
1892 }
1893
1894 led_on = !led_on;
1895 if(led_on) LED_B_ON(); else LED_B_OFF();
1896 par_list[nt_diff] = par;
1897 ks_list[nt_diff] = receivedAnswer[0] ^ 0x05;
1898
1899 // Test if the information is complete
1900 if (nt_diff == 0x07) {
1901 isOK = 1;
1902 break;
1903 }
1904
1905 nt_diff = (nt_diff + 1) & 0x07;
1906 mf_nr_ar[3] = nt_diff << 5;
1907 par = par_low;
1908 } else {
1909 if (nt_diff == 0)
1910 {
1911 par++;
1912 } else {
1913 par = (((par >> 3) + 1) << 3) | par_low;
1914 }
1915 }
1916 }
1917
1918 LogTrace(nt, 4, 0, GetParity(nt, 4), TRUE);
1919 LogTrace(par_list, 8, 0, GetParity(par_list, 8), TRUE);
1920 LogTrace(ks_list, 8, 0, GetParity(ks_list, 8), TRUE);
1921
1922 byte_t buf[48];
1923 // UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
1924 memcpy(buf + 0, uid, 4);
1925 memcpy(buf + 4, nt, 4);
1926 memcpy(buf + 8, par_list, 8);
1927 memcpy(buf + 16, ks_list, 8);
1928
1929 LED_B_ON();
1930 cmd_send(CMD_ACK,isOK,0,0,buf,48);
1931 // UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
1932 LED_B_OFF();
1933
1934 // Thats it...
1935 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1936 LEDsoff();
1937 tracing = TRUE;
1938
1939 if (MF_DBGLEVEL >= 1) DbpString("COMMAND mifare FINISHED");
1940 }
1941
1942
1943 //-----------------------------------------------------------------------------
1944 // MIFARE 1K simulate.
1945 //
1946 //-----------------------------------------------------------------------------
1947 void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
1948 {
1949 int cardSTATE = MFEMUL_NOFIELD;
1950 int _7BUID = 0;
1951 int vHf = 0; // in mV
1952 //int nextCycleTimeout = 0;
1953 int res;
1954 // uint32_t timer = 0;
1955 uint32_t selTimer = 0;
1956 uint32_t authTimer = 0;
1957 uint32_t par = 0;
1958 int len = 0;
1959 uint8_t cardWRBL = 0;
1960 uint8_t cardAUTHSC = 0;
1961 uint8_t cardAUTHKEY = 0xff; // no authentication
1962 //uint32_t cardRn = 0;
1963 uint32_t cardRr = 0;
1964 uint32_t cuid = 0;
1965 //uint32_t rn_enc = 0;
1966 uint32_t ans = 0;
1967 uint32_t cardINTREG = 0;
1968 uint8_t cardINTBLOCK = 0;
1969 struct Crypto1State mpcs = {0, 0};
1970 struct Crypto1State *pcs;
1971 pcs = &mpcs;
1972
1973 uint8_t* receivedCmd = eml_get_bigbufptr_recbuf();
1974 uint8_t *response = eml_get_bigbufptr_sendbuf();
1975
1976 static uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID
1977
1978 static uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62};
1979 static uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; // !!!
1980
1981 static uint8_t rSAK[] = {0x08, 0xb6, 0xdd};
1982 static uint8_t rSAK1[] = {0x04, 0xda, 0x17};
1983
1984 static uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04};
1985 // static uint8_t rAUTH_NT[] = {0x1a, 0xac, 0xff, 0x4f};
1986 static uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00};
1987
1988 // clear trace
1989 traceLen = 0;
1990 tracing = true;
1991
1992 // Authenticate response - nonce
1993 uint32_t nonce = bytes_to_num(rAUTH_NT, 4);
1994
1995 // get UID from emul memory
1996 emlGetMemBt(receivedCmd, 7, 1);
1997 _7BUID = !(receivedCmd[0] == 0x00);
1998 if (!_7BUID) { // ---------- 4BUID
1999 rATQA[0] = 0x04;
2000
2001 emlGetMemBt(rUIDBCC1, 0, 4);
2002 rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
2003 } else { // ---------- 7BUID
2004 rATQA[0] = 0x44;
2005
2006 rUIDBCC1[0] = 0x88;
2007 emlGetMemBt(&rUIDBCC1[1], 0, 3);
2008 rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
2009 emlGetMemBt(rUIDBCC2, 3, 4);
2010 rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3];
2011 }
2012
2013 // -------------------------------------- test area
2014
2015 // -------------------------------------- END test area
2016 // start mkseconds counter
2017 StartCountUS();
2018
2019 // We need to listen to the high-frequency, peak-detected path.
2020 SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
2021 FpgaSetupSsc();
2022
2023 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
2024 SpinDelay(200);
2025
2026 if (MF_DBGLEVEL >= 1) Dbprintf("Started. 7buid=%d", _7BUID);
2027 // calibrate mkseconds counter
2028 GetDeltaCountUS();
2029 while (true) {
2030 WDT_HIT();
2031
2032 if(BUTTON_PRESS()) {
2033 break;
2034 }
2035
2036 // find reader field
2037 // Vref = 3300mV, and an 10:1 voltage divider on the input
2038 // can measure voltages up to 33000 mV
2039 if (cardSTATE == MFEMUL_NOFIELD) {
2040 vHf = (33000 * AvgAdc(ADC_CHAN_HF)) >> 10;
2041 if (vHf > MF_MINFIELDV) {
2042 cardSTATE_TO_IDLE();
2043 LED_A_ON();
2044 }
2045 }
2046
2047 if (cardSTATE != MFEMUL_NOFIELD) {
2048 res = EmGetCmd(receivedCmd, &len, RECV_CMD_SIZE); // (+ nextCycleTimeout)
2049 if (res == 2) {
2050 cardSTATE = MFEMUL_NOFIELD;
2051 LEDsoff();
2052 continue;
2053 }
2054 if(res) break;
2055 }
2056
2057 //nextCycleTimeout = 0;
2058
2059 // if (len) Dbprintf("len:%d cmd: %02x %02x %02x %02x", len, receivedCmd[0], receivedCmd[1], receivedCmd[2], receivedCmd[3]);
2060
2061 if (len != 4 && cardSTATE != MFEMUL_NOFIELD) { // len != 4 <---- speed up the code 4 authentication
2062 // REQ or WUP request in ANY state and WUP in HALTED state
2063 if (len == 1 && ((receivedCmd[0] == 0x26 && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == 0x52)) {
2064 selTimer = GetTickCount();
2065 EmSendCmdEx(rATQA, sizeof(rATQA), (receivedCmd[0] == 0x52));
2066 cardSTATE = MFEMUL_SELECT1;
2067
2068 // init crypto block
2069 LED_B_OFF();
2070 LED_C_OFF();
2071 crypto1_destroy(pcs);
2072 cardAUTHKEY = 0xff;
2073 }
2074 }
2075
2076 switch (cardSTATE) {
2077 case MFEMUL_NOFIELD:{
2078 break;
2079 }
2080 case MFEMUL_HALTED:{
2081 break;
2082 }
2083 case MFEMUL_IDLE:{
2084 break;
2085 }
2086 case MFEMUL_SELECT1:{
2087 // select all
2088 if (len == 2 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x20)) {
2089 EmSendCmd(rUIDBCC1, sizeof(rUIDBCC1));
2090 break;
2091 }
2092
2093 // select card
2094 if (len == 9 &&
2095 (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) {
2096 if (!_7BUID)
2097 EmSendCmd(rSAK, sizeof(rSAK));
2098 else
2099 EmSendCmd(rSAK1, sizeof(rSAK1));
2100
2101 cuid = bytes_to_num(rUIDBCC1, 4);
2102 if (!_7BUID) {
2103 cardSTATE = MFEMUL_WORK;
2104 LED_B_ON();
2105 if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol1 time: %d", GetTickCount() - selTimer);
2106 break;
2107 } else {
2108 cardSTATE = MFEMUL_SELECT2;
2109 break;
2110 }
2111 }
2112
2113 break;
2114 }
2115 case MFEMUL_SELECT2:{
2116 if (!len) break;
2117
2118 if (len == 2 && (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x20)) {
2119 EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2));
2120 break;
2121 }
2122
2123 // select 2 card
2124 if (len == 9 &&
2125 (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC2, 4) == 0)) {
2126 EmSendCmd(rSAK, sizeof(rSAK));
2127
2128 cuid = bytes_to_num(rUIDBCC2, 4);
2129 cardSTATE = MFEMUL_WORK;
2130 LED_B_ON();
2131 if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol2 time: %d", GetTickCount() - selTimer);
2132 break;
2133 }
2134
2135 // i guess there is a command). go into the work state.
2136 if (len != 4) break;
2137 cardSTATE = MFEMUL_WORK;
2138 goto lbWORK;
2139 }
2140 case MFEMUL_AUTH1:{
2141 if (len == 8) {
2142 // --- crypto
2143 //rn_enc = bytes_to_num(receivedCmd, 4);
2144 //cardRn = rn_enc ^ crypto1_word(pcs, rn_enc , 1);
2145 cardRr = bytes_to_num(&receivedCmd[4], 4) ^ crypto1_word(pcs, 0, 0);
2146 // test if auth OK
2147 if (cardRr != prng_successor(nonce, 64)){
2148 if (MF_DBGLEVEL >= 4) Dbprintf("AUTH FAILED. cardRr=%08x, succ=%08x", cardRr, prng_successor(nonce, 64));
2149 cardSTATE_TO_IDLE();
2150 break;
2151 }
2152 ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0);
2153 num_to_bytes(ans, 4, rAUTH_AT);
2154 // --- crypto
2155 EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
2156 cardSTATE = MFEMUL_AUTH2;
2157 } else {
2158 cardSTATE_TO_IDLE();
2159 }
2160 if (cardSTATE != MFEMUL_AUTH2) break;
2161 }
2162 case MFEMUL_AUTH2:{
2163 LED_C_ON();
2164 cardSTATE = MFEMUL_WORK;
2165 if (MF_DBGLEVEL >= 4) Dbprintf("AUTH COMPLETED. sec=%d, key=%d time=%d", cardAUTHSC, cardAUTHKEY, GetTickCount() - authTimer);
2166 break;
2167 }
2168 case MFEMUL_WORK:{
2169 lbWORK: if (len == 0) break;
2170
2171 if (cardAUTHKEY == 0xff) {
2172 // first authentication
2173 if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) {
2174 authTimer = GetTickCount();
2175
2176 cardAUTHSC = receivedCmd[1] / 4; // received block num
2177 cardAUTHKEY = receivedCmd[0] - 0x60;
2178
2179 // --- crypto
2180 crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY));
2181 ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0);
2182 num_to_bytes(nonce, 4, rAUTH_AT);
2183 EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
2184 // --- crypto
2185
2186 // last working revision
2187 // EmSendCmd14443aRaw(resp1, resp1Len, 0);
2188 // LogTrace(NULL, 0, GetDeltaCountUS(), 0, true);
2189
2190 cardSTATE = MFEMUL_AUTH1;
2191 //nextCycleTimeout = 10;
2192 break;
2193 }
2194 } else {
2195 // decrypt seqence
2196 mf_crypto1_decrypt(pcs, receivedCmd, len);
2197
2198 // nested authentication
2199 if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) {
2200 authTimer = GetTickCount();
2201
2202 cardAUTHSC = receivedCmd[1] / 4; // received block num
2203 cardAUTHKEY = receivedCmd[0] - 0x60;
2204
2205 // --- crypto
2206 crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY));
2207 ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0);
2208 num_to_bytes(ans, 4, rAUTH_AT);
2209 EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
2210 // --- crypto
2211
2212 cardSTATE = MFEMUL_AUTH1;
2213 //nextCycleTimeout = 10;
2214 break;
2215 }
2216 }
2217
2218 // rule 13 of 7.5.3. in ISO 14443-4. chaining shall be continued
2219 // BUT... ACK --> NACK
2220 if (len == 1 && receivedCmd[0] == CARD_ACK) {
2221 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2222 break;
2223 }
2224
2225 // rule 12 of 7.5.3. in ISO 14443-4. R(NAK) --> R(ACK)
2226 if (len == 1 && receivedCmd[0] == CARD_NACK_NA) {
2227 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
2228 break;
2229 }
2230
2231 // read block
2232 if (len == 4 && receivedCmd[0] == 0x30) {
2233 if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) {
2234 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2235 break;
2236 }
2237 emlGetMem(response, receivedCmd[1], 1);
2238 AppendCrc14443a(response, 16);
2239 mf_crypto1_encrypt(pcs, response, 18, &par);
2240 EmSendCmdPar(response, 18, par);
2241 break;
2242 }
2243
2244 // write block
2245 if (len == 4 && receivedCmd[0] == 0xA0) {
2246 if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) {
2247 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2248 break;
2249 }
2250 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
2251 //nextCycleTimeout = 50;
2252 cardSTATE = MFEMUL_WRITEBL2;
2253 cardWRBL = receivedCmd[1];
2254 break;
2255 }
2256
2257 // works with cardINTREG
2258
2259 // increment, decrement, restore
2260 if (len == 4 && (receivedCmd[0] == 0xC0 || receivedCmd[0] == 0xC1 || receivedCmd[0] == 0xC2)) {
2261 if (receivedCmd[1] >= 16 * 4 ||
2262 receivedCmd[1] / 4 != cardAUTHSC ||
2263 emlCheckValBl(receivedCmd[1])) {
2264 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2265 break;
2266 }
2267 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
2268 if (receivedCmd[0] == 0xC1)
2269 cardSTATE = MFEMUL_INTREG_INC;
2270 if (receivedCmd[0] == 0xC0)
2271 cardSTATE = MFEMUL_INTREG_DEC;
2272 if (receivedCmd[0] == 0xC2)
2273 cardSTATE = MFEMUL_INTREG_REST;
2274 cardWRBL = receivedCmd[1];
2275
2276 break;
2277 }
2278
2279
2280 // transfer
2281 if (len == 4 && receivedCmd[0] == 0xB0) {
2282 if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) {
2283 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2284 break;
2285 }
2286
2287 if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd[1]))
2288 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2289 else
2290 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
2291
2292 break;
2293 }
2294
2295 // halt
2296 if (len == 4 && (receivedCmd[0] == 0x50 && receivedCmd[1] == 0x00)) {
2297 LED_B_OFF();
2298 LED_C_OFF();
2299 cardSTATE = MFEMUL_HALTED;
2300 if (MF_DBGLEVEL >= 4) Dbprintf("--> HALTED. Selected time: %d ms", GetTickCount() - selTimer);
2301 break;
2302 }
2303
2304 // command not allowed
2305 if (len == 4) {
2306 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2307 break;
2308 }
2309
2310 // case break
2311 break;
2312 }
2313 case MFEMUL_WRITEBL2:{
2314 if (len == 18){
2315 mf_crypto1_decrypt(pcs, receivedCmd, len);
2316 emlSetMem(receivedCmd, cardWRBL, 1);
2317 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
2318 cardSTATE = MFEMUL_WORK;
2319 break;
2320 } else {
2321 cardSTATE_TO_IDLE();
2322 break;
2323 }
2324 break;
2325 }
2326
2327 case MFEMUL_INTREG_INC:{
2328 mf_crypto1_decrypt(pcs, receivedCmd, len);
2329 memcpy(&ans, receivedCmd, 4);
2330 if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
2331 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2332 cardSTATE_TO_IDLE();
2333 break;
2334 }
2335 cardINTREG = cardINTREG + ans;
2336 cardSTATE = MFEMUL_WORK;
2337 break;
2338 }
2339 case MFEMUL_INTREG_DEC:{
2340 mf_crypto1_decrypt(pcs, receivedCmd, len);
2341 memcpy(&ans, receivedCmd, 4);
2342 if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
2343 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2344 cardSTATE_TO_IDLE();
2345 break;
2346 }
2347 cardINTREG = cardINTREG - ans;
2348 cardSTATE = MFEMUL_WORK;
2349 break;
2350 }
2351 case MFEMUL_INTREG_REST:{
2352 mf_crypto1_decrypt(pcs, receivedCmd, len);
2353 memcpy(&ans, receivedCmd, 4);
2354 if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
2355 EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
2356 cardSTATE_TO_IDLE();
2357 break;
2358 }
2359 cardSTATE = MFEMUL_WORK;
2360 break;
2361 }
2362 }
2363 }
2364
2365 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
2366 LEDsoff();
2367
2368 // add trace trailer
2369 memset(rAUTH_NT, 0x44, 4);
2370 LogTrace(rAUTH_NT, 4, 0, 0, TRUE);
2371
2372 if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, traceLen);
2373 }
2374
2375 //-----------------------------------------------------------------------------
2376 // MIFARE sniffer.
2377 //
2378 //-----------------------------------------------------------------------------
2379 void RAMFUNC SniffMifare(uint8_t param) {
2380 // param:
2381 // bit 0 - trigger from first card answer
2382 // bit 1 - trigger from first reader 7-bit request
2383
2384 // C(red) A(yellow) B(green)
2385 LEDsoff();
2386 // init trace buffer
2387 iso14a_clear_trace();
2388
2389 // The command (reader -> tag) that we're receiving.
2390 // The length of a received command will in most cases be no more than 18 bytes.
2391 // So 32 should be enough!
2392 uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
2393 // The response (tag -> reader) that we're receiving.
2394 uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET);
2395
2396 // As we receive stuff, we copy it from receivedCmd or receivedResponse
2397 // into trace, along with its length and other annotations.
2398 //uint8_t *trace = (uint8_t *)BigBuf;
2399
2400 // The DMA buffer, used to stream samples from the FPGA
2401 int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
2402 int8_t *data = dmaBuf;
2403 int maxDataLen = 0;
2404 int dataLen = 0;
2405
2406 // Set up the demodulator for tag -> reader responses.
2407 Demod.output = receivedResponse;
2408 Demod.len = 0;
2409 Demod.state = DEMOD_UNSYNCD;
2410
2411 // Set up the demodulator for the reader -> tag commands
2412 memset(&Uart, 0, sizeof(Uart));
2413 Uart.output = receivedCmd;
2414 Uart.byteCntMax = 32; // was 100 (greg)//////////////////
2415 Uart.state = STATE_UNSYNCD;
2416
2417 // Setup for the DMA.
2418 FpgaSetupSsc();
2419 FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
2420
2421 // And put the FPGA in the appropriate mode
2422 // Signal field is off with the appropriate LED
2423 LED_D_OFF();
2424 FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
2425 SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
2426
2427 // init sniffer
2428 MfSniffInit();
2429 int sniffCounter = 0;
2430
2431 // And now we loop, receiving samples.
2432 while(true) {
2433 if(BUTTON_PRESS()) {
2434 DbpString("cancelled by button");
2435 goto done;
2436 }
2437
2438 LED_A_ON();
2439 WDT_HIT();
2440
2441 if (++sniffCounter > 65) {
2442 if (MfSniffSend(2000)) {
2443 FpgaEnableSscDma();
2444 }
2445 sniffCounter = 0;
2446 }
2447
2448 int register readBufDataP = data - dmaBuf;
2449 int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR;
2450 if (readBufDataP <= dmaBufDataP){
2451 dataLen = dmaBufDataP - readBufDataP;
2452 } else {
2453 dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP + 1;
2454 }
2455 // test for length of buffer
2456 if(dataLen > maxDataLen) {
2457 maxDataLen = dataLen;
2458 if(dataLen > 400) {
2459 Dbprintf("blew circular buffer! dataLen=0x%x", dataLen);
2460 goto done;
2461 }
2462 }
2463 if(dataLen < 1) continue;
2464
2465 // primary buffer was stopped( <-- we lost data!
2466 if (!AT91C_BASE_PDC_SSC->PDC_RCR) {
2467 AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf;
2468 AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE;
2469 Dbprintf("RxEmpty ERROR!!! data length:%d", dataLen); // temporary
2470 }
2471 // secondary buffer sets as primary, secondary buffer was stopped
2472 if (!AT91C_BASE_PDC_SSC->PDC_RNCR) {
2473 AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
2474 AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
2475 }
2476
2477 LED_A_OFF();
2478
2479 if(MillerDecoding((data[0] & 0xF0) >> 4)) {
2480 LED_C_INV();
2481 // check - if there is a short 7bit request from reader
2482 if (MfSniffLogic(receivedCmd, Uart.byteCnt, Uart.parityBits, Uart.bitCnt, TRUE)) break;
2483
2484 /* And ready to receive another command. */
2485 Uart.state = STATE_UNSYNCD;
2486
2487 /* And also reset the demod code */
2488 Demod.state = DEMOD_UNSYNCD;
2489 }
2490
2491 if(ManchesterDecoding(data[0] & 0x0F)) {
2492 LED_C_INV();
2493
2494 if (MfSniffLogic(receivedResponse, Demod.len, Demod.parityBits, Demod.bitCount, FALSE)) break;
2495
2496 // And ready to receive another response.
2497 memset(&Demod, 0, sizeof(Demod));
2498 Demod.output = receivedResponse;
2499 Demod.state = DEMOD_UNSYNCD;
2500
2501 /* And also reset the uart code */
2502 Uart.state = STATE_UNSYNCD;
2503 }
2504
2505 data++;
2506 if(data > dmaBuf + DMA_BUFFER_SIZE) {
2507 data = dmaBuf;
2508 }
2509 } // main cycle
2510
2511 DbpString("COMMAND FINISHED");
2512
2513 done:
2514 FpgaDisableSscDma();
2515 MfSniffEnd();
2516
2517 Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.byteCnt=%x Uart.byteCntMax=%x", maxDataLen, Uart.state, Uart.byteCnt, Uart.byteCntMax);
2518 LEDsoff();
2519 }
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