]>
Commit | Line | Data |
---|---|---|
1 | //----------------------------------------------------------------------------- | |
2 | // This code is licensed to you under the terms of the GNU GPL, version 2 or, | |
3 | // at your option, any later version. See the LICENSE.txt file for the text of | |
4 | // the license. | |
5 | //----------------------------------------------------------------------------- | |
6 | // HitagS emulation (preliminary test version) | |
7 | // | |
8 | // (c) 2016 Oguzhan Cicek, Hendrik Schwartke, Ralf Spenneberg | |
9 | // <info@os-s.de> | |
10 | //----------------------------------------------------------------------------- | |
11 | // Some code was copied from Hitag2.c | |
12 | //----------------------------------------------------------------------------- | |
13 | ||
14 | ||
15 | #include <stdio.h> | |
16 | #include <stdlib.h> | |
17 | #include "proxmark3.h" | |
18 | #include "apps.h" | |
19 | #include "util.h" | |
20 | #include "hitagS.h" | |
21 | #include "hitag2.h" | |
22 | #include "string.h" | |
23 | #include "BigBuf.h" | |
24 | ||
25 | #define CRC_PRESET 0xFF | |
26 | #define CRC_POLYNOM 0x1D | |
27 | ||
28 | #define u8 uint8_t | |
29 | #define u32 uint32_t | |
30 | #define u64 uint64_t | |
31 | #define rev8(x) ((((x)>>7)&1)+((((x)>>6)&1)<<1)+((((x)>>5)&1)<<2)+((((x)>>4)&1)<<3)+((((x)>>3)&1)<<4)+((((x)>>2)&1)<<5)+((((x)>>1)&1)<<6)+(((x)&1)<<7)) | |
32 | #define rev16(x) (rev8 (x)+(rev8 (x>> 8)<< 8)) | |
33 | #define rev32(x) (rev16(x)+(rev16(x>>16)<<16)) | |
34 | #define rev64(x) (rev32(x)+(rev32(x>>32)<<32)) | |
35 | #define bit(x,n) (((x)>>(n))&1) | |
36 | #define bit32(x,n) ((((x)[(n)>>5])>>((n)))&1) | |
37 | #define inv32(x,i,n) ((x)[(i)>>5]^=((u32)(n))<<((i)&31)) | |
38 | #define rotl64(x, n) ((((u64)(x))<<((n)&63))+(((u64)(x))>>((0-(n))&63))) | |
39 | ||
40 | static bool bQuiet; | |
41 | static bool bSuccessful; | |
42 | static struct hitagS_tag tag; | |
43 | static byte_t page_to_be_written = 0; | |
44 | static int block_data_left = 0; | |
45 | typedef enum modulation { | |
46 | AC2K = 0, | |
47 | AC4K, | |
48 | MC4K, | |
49 | MC8K | |
50 | } MOD; | |
51 | static MOD m = AC2K; //used modulation | |
52 | static uint32_t temp_uid; | |
53 | static int temp2 = 0; | |
54 | static int sof_bits; //number of start-of-frame bits | |
55 | static byte_t pwdh0, pwdl0, pwdl1; //password bytes | |
56 | static uint32_t rnd = 0x74124485; //randomnumber | |
57 | static int test = 0; | |
58 | size_t blocknr; | |
59 | bool end=false; | |
60 | ||
61 | // Single bit Hitag2 functions: | |
62 | #define i4(x,a,b,c,d) ((u32)((((x)>>(a))&1)+(((x)>>(b))&1)*2+(((x)>>(c))&1)*4+(((x)>>(d))&1)*8)) | |
63 | static const u32 ht2_f4a = 0x2C79; // 0010 1100 0111 1001 | |
64 | static const u32 ht2_f4b = 0x6671; // 0110 0110 0111 0001 | |
65 | static const u32 ht2_f5c = 0x7907287B; // 0111 1001 0000 0111 0010 1000 0111 1011 | |
66 | #define ht2bs_4a(a,b,c,d) (~(((a|b)&c)^(a|d)^b)) | |
67 | #define ht2bs_4b(a,b,c,d) (~(((d|c)&(a^b))^(d|a|b))) | |
68 | #define ht2bs_5c(a,b,c,d,e) (~((((((c^e)|d)&a)^b)&(c^b))^(((d^e)|a)&((d^b)|c)))) | |
69 | #define uf20bs u32 | |
70 | ||
71 | static u32 f20(const u64 x) { | |
72 | u32 i5; | |
73 | ||
74 | i5 = ((ht2_f4a >> i4(x, 1, 2, 4, 5)) & 1) * 1 | |
75 | + ((ht2_f4b >> i4(x, 7, 11, 13, 14)) & 1) * 2 | |
76 | + ((ht2_f4b >> i4(x, 16, 20, 22, 25)) & 1) * 4 | |
77 | + ((ht2_f4b >> i4(x, 27, 28, 30, 32)) & 1) * 8 | |
78 | + ((ht2_f4a >> i4(x, 33, 42, 43, 45)) & 1) * 16; | |
79 | ||
80 | return (ht2_f5c >> i5) & 1; | |
81 | } | |
82 | static u64 hitag2_round(u64 *state) { | |
83 | u64 x = *state; | |
84 | ||
85 | x = (x >> 1) | |
86 | + ((((x >> 0) ^ (x >> 2) ^ (x >> 3) ^ (x >> 6) ^ (x >> 7) ^ (x >> 8) | |
87 | ^ (x >> 16) ^ (x >> 22) ^ (x >> 23) ^ (x >> 26) ^ (x >> 30) | |
88 | ^ (x >> 41) ^ (x >> 42) ^ (x >> 43) ^ (x >> 46) ^ (x >> 47)) | |
89 | & 1) << 47); | |
90 | ||
91 | *state = x; | |
92 | return f20(x); | |
93 | } | |
94 | static u64 hitag2_init(const u64 key, const u32 serial, const u32 IV) { | |
95 | u32 i; | |
96 | u64 x = ((key & 0xFFFF) << 32) + serial; | |
97 | for (i = 0; i < 32; i++) { | |
98 | x >>= 1; | |
99 | x += (u64) (f20(x) ^ (((IV >> i) ^ (key >> (i + 16))) & 1)) << 47; | |
100 | } | |
101 | return x; | |
102 | } | |
103 | static u32 hitag2_byte(u64 *x) { | |
104 | u32 i, c; | |
105 | ||
106 | for (i = 0, c = 0; i < 8; i++) | |
107 | c += (u32) hitag2_round(x) << (i ^ 7); | |
108 | return c; | |
109 | } | |
110 | ||
111 | // Sam7s has several timers, we will use the source TIMER_CLOCK1 (aka AT91C_TC_CLKS_TIMER_DIV1_CLOCK) | |
112 | // TIMER_CLOCK1 = MCK/2, MCK is running at 48 MHz, Timer is running at 48/2 = 24 MHz | |
113 | // Hitag units (T0) have duration of 8 microseconds (us), which is 1/125000 per second (carrier) | |
114 | // T0 = TIMER_CLOCK1 / 125000 = 192 | |
115 | #define T0 192 | |
116 | ||
117 | #define SHORT_COIL() LOW(GPIO_SSC_DOUT) | |
118 | #define OPEN_COIL() HIGH(GPIO_SSC_DOUT) | |
119 | ||
120 | #define HITAG_FRAME_LEN 20 | |
121 | #define HITAG_T_STOP 36 /* T_EOF should be > 36 */ | |
122 | #define HITAG_T_LOW 8 /* T_LOW should be 4..10 */ | |
123 | #define HITAG_T_0_MIN 15 /* T[0] should be 18..22 */ | |
124 | #define HITAG_T_1_MIN 25 /* T[1] should be 26..30 */ | |
125 | //#define HITAG_T_EOF 40 /* T_EOF should be > 36 */ | |
126 | #define HITAG_T_EOF 80 /* T_EOF should be > 36 */ | |
127 | #define HITAG_T_WAIT_1 200 /* T_wresp should be 199..206 */ | |
128 | #define HITAG_T_WAIT_2 90 /* T_wresp should be 199..206 */ | |
129 | #define HITAG_T_WAIT_MAX 300 /* bit more than HITAG_T_WAIT_1 + HITAG_T_WAIT_2 */ | |
130 | ||
131 | #define HITAG_T_TAG_ONE_HALF_PERIOD 10 | |
132 | #define HITAG_T_TAG_TWO_HALF_PERIOD 25 | |
133 | #define HITAG_T_TAG_THREE_HALF_PERIOD 41 | |
134 | #define HITAG_T_TAG_FOUR_HALF_PERIOD 57 | |
135 | ||
136 | #define HITAG_T_TAG_HALF_PERIOD 16 | |
137 | #define HITAG_T_TAG_FULL_PERIOD 32 | |
138 | ||
139 | #define HITAG_T_TAG_CAPTURE_ONE_HALF 13 | |
140 | #define HITAG_T_TAG_CAPTURE_TWO_HALF 25 | |
141 | #define HITAG_T_TAG_CAPTURE_THREE_HALF 41 | |
142 | #define HITAG_T_TAG_CAPTURE_FOUR_HALF 57 | |
143 | ||
144 | #define DEBUG 0 | |
145 | ||
146 | /* | |
147 | * Implementation of the crc8 calculation from Hitag S | |
148 | * from http://www.proxmark.org/files/Documents/125%20kHz%20-%20Hitag/HitagS.V11.pdf | |
149 | */ | |
150 | void calc_crc(unsigned char * crc, unsigned char data, unsigned char Bitcount) { | |
151 | *crc ^= data; // crc = crc (exor) data | |
152 | do { | |
153 | if (*crc & 0x80) // if (MSB-CRC == 1) | |
154 | { | |
155 | *crc <<= 1; // CRC = CRC Bit-shift left | |
156 | *crc ^= CRC_POLYNOM; // CRC = CRC (exor) CRC_POLYNOM | |
157 | } else { | |
158 | *crc <<= 1; // CRC = CRC Bit-shift left | |
159 | } | |
160 | } while (--Bitcount); | |
161 | } | |
162 | ||
163 | static void hitag_send_bit(int bit) { | |
164 | LED_A_ON(); | |
165 | // Reset clock for the next bit | |
166 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; | |
167 | ||
168 | switch (m) { | |
169 | case AC2K: | |
170 | if (bit == 0) { | |
171 | // AC Coding --__ | |
172 | HIGH(GPIO_SSC_DOUT); | |
173 | while (AT91C_BASE_TC0->TC_CV < T0 * 32) | |
174 | ; | |
175 | LOW(GPIO_SSC_DOUT); | |
176 | while (AT91C_BASE_TC0->TC_CV < T0 * 64) | |
177 | ; | |
178 | } else { | |
179 | // AC coding -_-_ | |
180 | HIGH(GPIO_SSC_DOUT); | |
181 | while (AT91C_BASE_TC0->TC_CV < T0 * 16) | |
182 | ; | |
183 | LOW(GPIO_SSC_DOUT); | |
184 | while (AT91C_BASE_TC0->TC_CV < T0 * 32) | |
185 | ; | |
186 | HIGH(GPIO_SSC_DOUT); | |
187 | while (AT91C_BASE_TC0->TC_CV < T0 * 48) | |
188 | ; | |
189 | LOW(GPIO_SSC_DOUT); | |
190 | while (AT91C_BASE_TC0->TC_CV < T0 * 64) | |
191 | ;; | |
192 | } | |
193 | LED_A_OFF(); | |
194 | break; | |
195 | case AC4K: | |
196 | if (bit == 0) { | |
197 | // AC Coding --__ | |
198 | HIGH(GPIO_SSC_DOUT); | |
199 | while (AT91C_BASE_TC0->TC_CV < T0 * HITAG_T_TAG_HALF_PERIOD) | |
200 | ; | |
201 | LOW(GPIO_SSC_DOUT); | |
202 | while (AT91C_BASE_TC0->TC_CV < T0 * HITAG_T_TAG_FULL_PERIOD) | |
203 | ; | |
204 | } else { | |
205 | // AC coding -_-_ | |
206 | HIGH(GPIO_SSC_DOUT); | |
207 | while (AT91C_BASE_TC0->TC_CV < T0 * 8) | |
208 | ; | |
209 | LOW(GPIO_SSC_DOUT); | |
210 | while (AT91C_BASE_TC0->TC_CV < T0 * 16) | |
211 | ; | |
212 | HIGH(GPIO_SSC_DOUT); | |
213 | while (AT91C_BASE_TC0->TC_CV < T0 * 24) | |
214 | ; | |
215 | LOW(GPIO_SSC_DOUT); | |
216 | while (AT91C_BASE_TC0->TC_CV < T0 * 32) | |
217 | ;; | |
218 | } | |
219 | LED_A_OFF(); | |
220 | break; | |
221 | case MC4K: | |
222 | if (bit == 0) { | |
223 | // Manchester: Unloaded, then loaded |__--| | |
224 | LOW(GPIO_SSC_DOUT); | |
225 | while (AT91C_BASE_TC0->TC_CV < T0 * 16) | |
226 | ; | |
227 | HIGH(GPIO_SSC_DOUT); | |
228 | while (AT91C_BASE_TC0->TC_CV < T0 * 32) | |
229 | ; | |
230 | } else { | |
231 | // Manchester: Loaded, then unloaded |--__| | |
232 | HIGH(GPIO_SSC_DOUT); | |
233 | while (AT91C_BASE_TC0->TC_CV < T0 * 16) | |
234 | ; | |
235 | LOW(GPIO_SSC_DOUT); | |
236 | while (AT91C_BASE_TC0->TC_CV < T0 * 32) | |
237 | ; | |
238 | } | |
239 | LED_A_OFF(); | |
240 | break; | |
241 | case MC8K: | |
242 | if (bit == 0) { | |
243 | // Manchester: Unloaded, then loaded |__--| | |
244 | LOW(GPIO_SSC_DOUT); | |
245 | while (AT91C_BASE_TC0->TC_CV < T0 * 8) | |
246 | ; | |
247 | HIGH(GPIO_SSC_DOUT); | |
248 | while (AT91C_BASE_TC0->TC_CV < T0 * 16) | |
249 | ; | |
250 | } else { | |
251 | // Manchester: Loaded, then unloaded |--__| | |
252 | HIGH(GPIO_SSC_DOUT); | |
253 | while (AT91C_BASE_TC0->TC_CV < T0 * 8) | |
254 | ; | |
255 | LOW(GPIO_SSC_DOUT); | |
256 | while (AT91C_BASE_TC0->TC_CV < T0 * 16) | |
257 | ; | |
258 | } | |
259 | LED_A_OFF(); | |
260 | break; | |
261 | default: | |
262 | break; | |
263 | } | |
264 | } | |
265 | ||
266 | static void hitag_send_frame(const byte_t* frame, size_t frame_len) { | |
267 | // Send start of frame | |
268 | ||
269 | for (size_t i = 0; i < sof_bits; i++) { | |
270 | hitag_send_bit(1); | |
271 | } | |
272 | ||
273 | // Send the content of the frame | |
274 | for (size_t i = 0; i < frame_len; i++) { | |
275 | hitag_send_bit((frame[i / 8] >> (7 - (i % 8))) & 1); | |
276 | } | |
277 | // Drop the modulation | |
278 | LOW(GPIO_SSC_DOUT); | |
279 | } | |
280 | ||
281 | static void hitag_reader_send_bit(int bit) { | |
282 | //Dbprintf("BIT: %d",bit); | |
283 | LED_A_ON(); | |
284 | // Reset clock for the next bit | |
285 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; | |
286 | ||
287 | // Binary puls length modulation (BPLM) is used to encode the data stream | |
288 | // This means that a transmission of a one takes longer than that of a zero | |
289 | ||
290 | // Enable modulation, which means, drop the the field | |
291 | HIGH(GPIO_SSC_DOUT); | |
292 | if (test == 1) { | |
293 | // Wait for 4-10 times the carrier period | |
294 | while (AT91C_BASE_TC0->TC_CV < T0 * 6) | |
295 | ; | |
296 | // SpinDelayUs(8*8); | |
297 | ||
298 | // Disable modulation, just activates the field again | |
299 | LOW(GPIO_SSC_DOUT); | |
300 | ||
301 | if (bit == 0) { | |
302 | // Zero bit: |_-| | |
303 | while (AT91C_BASE_TC0->TC_CV < T0 * 11) | |
304 | ; | |
305 | // SpinDelayUs(16*8); | |
306 | } else { | |
307 | // One bit: |_--| | |
308 | while (AT91C_BASE_TC0->TC_CV < T0 * 14) | |
309 | ; | |
310 | // SpinDelayUs(22*8); | |
311 | } | |
312 | } else { | |
313 | // Wait for 4-10 times the carrier period | |
314 | while (AT91C_BASE_TC0->TC_CV < T0 * 6) | |
315 | ; | |
316 | // SpinDelayUs(8*8); | |
317 | ||
318 | // Disable modulation, just activates the field again | |
319 | LOW(GPIO_SSC_DOUT); | |
320 | ||
321 | if (bit == 0) { | |
322 | // Zero bit: |_-| | |
323 | while (AT91C_BASE_TC0->TC_CV < T0 * 22) | |
324 | ; | |
325 | // SpinDelayUs(16*8); | |
326 | } else { | |
327 | // One bit: |_--| | |
328 | while (AT91C_BASE_TC0->TC_CV < T0 * 28) | |
329 | ; | |
330 | // SpinDelayUs(22*8); | |
331 | } | |
332 | } | |
333 | ||
334 | LED_A_OFF(); | |
335 | } | |
336 | ||
337 | static void hitag_reader_send_frame(const byte_t* frame, size_t frame_len) { | |
338 | // Send the content of the frame | |
339 | for (size_t i = 0; i < frame_len; i++) { | |
340 | if (frame[0] == 0xf8) { | |
341 | //Dbprintf("BIT: %d",(frame[i / 8] >> (7 - (i % 8))) & 1); | |
342 | } | |
343 | hitag_reader_send_bit((frame[i / 8] >> (7 - (i % 8))) & 1); | |
344 | } | |
345 | // Send EOF | |
346 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; | |
347 | // Enable modulation, which means, drop the the field | |
348 | HIGH(GPIO_SSC_DOUT); | |
349 | // Wait for 4-10 times the carrier period | |
350 | while (AT91C_BASE_TC0->TC_CV < T0 * 6) | |
351 | ; | |
352 | // Disable modulation, just activates the field again | |
353 | LOW(GPIO_SSC_DOUT); | |
354 | } | |
355 | ||
356 | /* | |
357 | * to check if the right uid was selected | |
358 | */ | |
359 | static int check_select(byte_t* rx, uint32_t uid) { | |
360 | unsigned char resp[48]; | |
361 | int i; | |
362 | uint32_t ans = 0x0; | |
363 | for (i = 0; i < 48; i++) | |
364 | resp[i] = (rx[i / 8] >> (7 - (i % 8))) & 0x1; | |
365 | for (i = 0; i < 32; i++) | |
366 | ans += resp[5 + i] << (31 - i); | |
367 | /*if (rx[0] == 0x01 && rx[1] == 0x15 && rx[2] == 0xc1 && rx[3] == 0x14 | |
368 | && rx[4] == 0x65 && rx[5] == 0x38) | |
369 | Dbprintf("got uid %X", ans);*/ | |
370 | temp_uid = ans; | |
371 | if (ans == tag.uid) | |
372 | return 1; | |
373 | return 0; | |
374 | } | |
375 | ||
376 | /* | |
377 | * handles all commands from a reader | |
378 | */ | |
379 | static void hitagS_handle_reader_command(byte_t* rx, const size_t rxlen, | |
380 | byte_t* tx, size_t* txlen) { | |
381 | byte_t rx_air[HITAG_FRAME_LEN]; | |
382 | byte_t page; | |
383 | int i; | |
384 | u64 state; | |
385 | unsigned char crc; | |
386 | ||
387 | // Copy the (original) received frame how it is send over the air | |
388 | memcpy(rx_air, rx, nbytes(rxlen)); | |
389 | // Reset the transmission frame length | |
390 | *txlen = 0; | |
391 | // Try to find out which command was send by selecting on length (in bits) | |
392 | switch (rxlen) { | |
393 | case 5: { | |
394 | //UID request with a selected response protocol mode | |
395 | tag.pstate = HT_READY; | |
396 | tag.tstate = HT_NO_OP; | |
397 | if ((rx[0] & 0xf0) == 0x30) { | |
398 | tag.mode = HT_STANDARD; | |
399 | sof_bits = 1; | |
400 | m = AC2K; | |
401 | } | |
402 | if ((rx[0] & 0xf0) == 0xc0) { | |
403 | tag.mode = HT_ADVANCED; | |
404 | sof_bits = 3; | |
405 | m = AC2K; | |
406 | } | |
407 | ||
408 | if ((rx[0] & 0xf0) == 0xd0) { | |
409 | tag.mode = HT_FAST_ADVANCED; | |
410 | sof_bits = 3; | |
411 | m = AC4K; | |
412 | } | |
413 | //send uid as a response | |
414 | *txlen = 32; | |
415 | for (i = 0; i < 4; i++) | |
416 | tx[i] = (tag.uid >> (24 - (i * 8))) & 0xff; | |
417 | } | |
418 | break; | |
419 | case 45: { | |
420 | //select command from reader received | |
421 | if (check_select(rx, tag.uid) == 1) { | |
422 | //if the right tag was selected | |
423 | *txlen = 32; | |
424 | switch (tag.mode) { | |
425 | case HT_STANDARD: | |
426 | sof_bits = 1; | |
427 | m = MC4K; | |
428 | break; | |
429 | case HT_ADVANCED: | |
430 | sof_bits = 6; | |
431 | m = MC4K; | |
432 | break; | |
433 | case HT_FAST_ADVANCED: | |
434 | sof_bits = 6; | |
435 | m = MC8K; | |
436 | break; | |
437 | default: | |
438 | break; | |
439 | } | |
440 | ||
441 | //send configuration | |
442 | for (i = 0; i < 4; i++) | |
443 | tx[i] = (tag.pages[0][1] >> (i * 8)) & 0xff; | |
444 | tx[3] = 0xff; | |
445 | if (tag.mode != HT_STANDARD) { | |
446 | *txlen = 40; | |
447 | crc = CRC_PRESET; | |
448 | for (i = 0; i < 4; i++) | |
449 | calc_crc(&crc, tx[i], 8); | |
450 | tx[4] = crc; | |
451 | } | |
452 | } | |
453 | } | |
454 | break; | |
455 | case 64: { | |
456 | //challenge message received | |
457 | Dbprintf("Challenge for UID: %X", temp_uid); | |
458 | temp2++; | |
459 | *txlen = 32; | |
460 | state = hitag2_init(rev64(tag.key), rev32(tag.pages[0][0]), | |
461 | rev32(((rx[3] << 24) + (rx[2] << 16) + (rx[1] << 8) + rx[0]))); | |
462 | Dbprintf( | |
463 | ",{0x%02X, 0x%02X, 0x%02X, 0x%02X, 0x%02X, 0x%02X, 0x%02X, 0x%02X}", | |
464 | rx[0], rx[1], rx[2], rx[3], rx[4], rx[5], rx[6], rx[7]); | |
465 | switch (tag.mode) { | |
466 | case HT_STANDARD: | |
467 | sof_bits = 1; | |
468 | m = MC4K; | |
469 | break; | |
470 | case HT_ADVANCED: | |
471 | sof_bits = 6; | |
472 | m = MC4K; | |
473 | break; | |
474 | case HT_FAST_ADVANCED: | |
475 | sof_bits = 6; | |
476 | m = MC8K; | |
477 | break; | |
478 | default: | |
479 | break; | |
480 | } | |
481 | ||
482 | for (i = 0; i < 4; i++) | |
483 | hitag2_byte(&state); | |
484 | //send con2,pwdh0,pwdl0,pwdl1 encrypted as a response | |
485 | tx[0] = hitag2_byte(&state) ^ ((tag.pages[0][1] >> 16) & 0xff); | |
486 | tx[1] = hitag2_byte(&state) ^ tag.pwdh0; | |
487 | tx[2] = hitag2_byte(&state) ^ tag.pwdl0; | |
488 | tx[3] = hitag2_byte(&state) ^ tag.pwdl1; | |
489 | if (tag.mode != HT_STANDARD) { | |
490 | //add crc8 | |
491 | *txlen = 40; | |
492 | crc = CRC_PRESET; | |
493 | calc_crc(&crc, ((tag.pages[0][1] >> 16) & 0xff), 8); | |
494 | calc_crc(&crc, tag.pwdh0, 8); | |
495 | calc_crc(&crc, tag.pwdl0, 8); | |
496 | calc_crc(&crc, tag.pwdl1, 8); | |
497 | tx[4] = (crc ^ hitag2_byte(&state)); | |
498 | } | |
499 | /* | |
500 | * some readers do not allow to authenticate multiple times in a row with the same tag. | |
501 | * use this to change the uid between authentications. | |
502 | */ | |
503 | ||
504 | /* | |
505 | if (temp2 % 2 == 0) { | |
506 | tag.uid = 0x11223344; | |
507 | tag.pages[0][0] = 0x44332211; | |
508 | } else { | |
509 | tag.uid = 0x55667788; | |
510 | tag.pages[0][0] = 0x88776655; | |
511 | } | |
512 | */ | |
513 | } | |
514 | case 40: | |
515 | //data received to be written | |
516 | if (tag.tstate == HT_WRITING_PAGE_DATA) { | |
517 | tag.tstate = HT_NO_OP; | |
518 | tag.pages[page_to_be_written / 4][page_to_be_written % 4] = (rx[0] | |
519 | << 0) + (rx[1] << 8) + (rx[2] << 16) + (rx[3] << 24); | |
520 | //send ack | |
521 | *txlen = 2; | |
522 | tx[0] = 0x40; | |
523 | page_to_be_written = 0; | |
524 | switch (tag.mode) { | |
525 | case HT_STANDARD: | |
526 | sof_bits = 1; | |
527 | m = MC4K; | |
528 | break; | |
529 | case HT_ADVANCED: | |
530 | sof_bits = 6; | |
531 | m = MC4K; | |
532 | break; | |
533 | case HT_FAST_ADVANCED: | |
534 | sof_bits = 6; | |
535 | m = MC8K; | |
536 | break; | |
537 | default: | |
538 | break; | |
539 | } | |
540 | } else if (tag.tstate == HT_WRITING_BLOCK_DATA) { | |
541 | tag.pages[page_to_be_written / 4][page_to_be_written % 4] = (rx[0] | |
542 | << 24) + (rx[1] << 16) + (rx[2] << 8) + rx[3]; | |
543 | //send ack | |
544 | *txlen = 2; | |
545 | tx[0] = 0x40; | |
546 | switch (tag.mode) { | |
547 | case HT_STANDARD: | |
548 | sof_bits = 1; | |
549 | m = MC4K; | |
550 | break; | |
551 | case HT_ADVANCED: | |
552 | sof_bits = 6; | |
553 | m = MC4K; | |
554 | break; | |
555 | case HT_FAST_ADVANCED: | |
556 | sof_bits = 6; | |
557 | m = MC8K; | |
558 | break; | |
559 | default: | |
560 | break; | |
561 | } | |
562 | page_to_be_written++; | |
563 | block_data_left--; | |
564 | if (block_data_left == 0) { | |
565 | tag.tstate = HT_NO_OP; | |
566 | page_to_be_written = 0; | |
567 | } | |
568 | } | |
569 | break; | |
570 | case 20: { | |
571 | //write page, write block, read page or read block command received | |
572 | if ((rx[0] & 0xf0) == 0xc0) //read page | |
573 | { | |
574 | //send page data | |
575 | page = ((rx[0] & 0x0f) * 16) + ((rx[1] & 0xf0) / 16); | |
576 | *txlen = 32; | |
577 | tx[0] = (tag.pages[page / 4][page % 4]) & 0xff; | |
578 | tx[1] = (tag.pages[page / 4][page % 4] >> 8) & 0xff; | |
579 | tx[2] = (tag.pages[page / 4][page % 4] >> 16) & 0xff; | |
580 | tx[3] = (tag.pages[page / 4][page % 4] >> 24) & 0xff; | |
581 | if (tag.LKP && page == 1) | |
582 | tx[3] = 0xff; | |
583 | ||
584 | switch (tag.mode) { | |
585 | case HT_STANDARD: | |
586 | sof_bits = 1; | |
587 | m = MC4K; | |
588 | break; | |
589 | case HT_ADVANCED: | |
590 | sof_bits = 6; | |
591 | m = MC4K; | |
592 | break; | |
593 | case HT_FAST_ADVANCED: | |
594 | sof_bits = 6; | |
595 | m = MC8K; | |
596 | break; | |
597 | default: | |
598 | break; | |
599 | } | |
600 | ||
601 | if (tag.mode != HT_STANDARD) { | |
602 | //add crc8 | |
603 | *txlen = 40; | |
604 | crc = CRC_PRESET; | |
605 | for (i = 0; i < 4; i++) | |
606 | calc_crc(&crc, tx[i], 8); | |
607 | tx[4] = crc; | |
608 | } | |
609 | ||
610 | if (tag.LKP && (page == 2 || page == 3)) { | |
611 | //if reader asks for key or password and the LKP-mark is set do not respond | |
612 | sof_bits = 0; | |
613 | *txlen = 0; | |
614 | } | |
615 | } else if ((rx[0] & 0xf0) == 0xd0) //read block | |
616 | { | |
617 | page = ((rx[0] & 0x0f) * 16) + ((rx[1] & 0xf0) / 16); | |
618 | *txlen = 32 * 4; | |
619 | //send page,...,page+3 data | |
620 | for (i = 0; i < 4; i++) { | |
621 | tx[0 + i * 4] = (tag.pages[page / 4][page % 4]) & 0xff; | |
622 | tx[1 + i * 4] = (tag.pages[page / 4][page % 4] >> 8) & 0xff; | |
623 | tx[2 + i * 4] = (tag.pages[page / 4][page % 4] >> 16) & 0xff; | |
624 | tx[3 + i * 4] = (tag.pages[page / 4][page % 4] >> 24) & 0xff; | |
625 | page++; | |
626 | } | |
627 | ||
628 | switch (tag.mode) { | |
629 | case HT_STANDARD: | |
630 | sof_bits = 1; | |
631 | m = MC4K; | |
632 | break; | |
633 | case HT_ADVANCED: | |
634 | sof_bits = 6; | |
635 | m = MC4K; | |
636 | break; | |
637 | case HT_FAST_ADVANCED: | |
638 | sof_bits = 6; | |
639 | m = MC8K; | |
640 | break; | |
641 | default: | |
642 | break; | |
643 | } | |
644 | ||
645 | if (tag.mode != HT_STANDARD) { | |
646 | //add crc8 | |
647 | *txlen = 32 * 4 + 8; | |
648 | crc = CRC_PRESET; | |
649 | for (i = 0; i < 16; i++) | |
650 | calc_crc(&crc, tx[i], 8); | |
651 | tx[16] = crc; | |
652 | } | |
653 | ||
654 | if ((page - 4) % 4 != 0 || (tag.LKP && (page - 4) == 0)) { | |
655 | sof_bits = 0; | |
656 | *txlen = 0; | |
657 | } | |
658 | } else if ((rx[0] & 0xf0) == 0x80) //write page | |
659 | { | |
660 | page = ((rx[0] & 0x0f) * 16) + ((rx[1] & 0xf0) / 16); | |
661 | ||
662 | switch (tag.mode) { | |
663 | case HT_STANDARD: | |
664 | sof_bits = 1; | |
665 | m = MC4K; | |
666 | break; | |
667 | case HT_ADVANCED: | |
668 | sof_bits = 6; | |
669 | m = MC4K; | |
670 | break; | |
671 | case HT_FAST_ADVANCED: | |
672 | sof_bits = 6; | |
673 | m = MC8K; | |
674 | break; | |
675 | default: | |
676 | break; | |
677 | } | |
678 | if ((tag.LCON && page == 1) | |
679 | || (tag.LKP && (page == 2 || page == 3))) { | |
680 | //deny | |
681 | *txlen = 0; | |
682 | } else { | |
683 | //allow | |
684 | *txlen = 2; | |
685 | tx[0] = 0x40; | |
686 | page_to_be_written = page; | |
687 | tag.tstate = HT_WRITING_PAGE_DATA; | |
688 | } | |
689 | ||
690 | } else if ((rx[0] & 0xf0) == 0x90) //write block | |
691 | { | |
692 | page = ((rx[0] & 0x0f) * 6) + ((rx[1] & 0xf0) / 16); | |
693 | switch (tag.mode) { | |
694 | case HT_STANDARD: | |
695 | sof_bits = 1; | |
696 | m = MC4K; | |
697 | break; | |
698 | case HT_ADVANCED: | |
699 | sof_bits = 6; | |
700 | m = MC4K; | |
701 | break; | |
702 | case HT_FAST_ADVANCED: | |
703 | sof_bits = 6; | |
704 | m = MC8K; | |
705 | break; | |
706 | default: | |
707 | break; | |
708 | } | |
709 | if (page % 4 != 0 || page == 0) { | |
710 | //deny | |
711 | *txlen = 0; | |
712 | } else { | |
713 | //allow | |
714 | *txlen = 2; | |
715 | tx[0] = 0x40; | |
716 | page_to_be_written = page; | |
717 | block_data_left = 4; | |
718 | tag.tstate = HT_WRITING_BLOCK_DATA; | |
719 | } | |
720 | } | |
721 | } | |
722 | break; | |
723 | default: | |
724 | ||
725 | break; | |
726 | } | |
727 | } | |
728 | ||
729 | /* | |
730 | * to autenticate to a tag with the given key or challenge | |
731 | */ | |
732 | static int hitagS_handle_tag_auth(hitag_function htf,uint64_t key, uint64_t NrAr, byte_t* rx, const size_t rxlen, byte_t* tx, | |
733 | size_t* txlen) { | |
734 | byte_t rx_air[HITAG_FRAME_LEN]; | |
735 | int response_bit[200]; | |
736 | int i, j, z, k; | |
737 | unsigned char mask = 1; | |
738 | unsigned char uid[32]; | |
739 | byte_t uid1 = 0x00, uid2 = 0x00, uid3 = 0x00, uid4 = 0x00; | |
740 | unsigned char crc; | |
741 | u64 state; | |
742 | byte_t auth_ks[4]; | |
743 | byte_t conf_pages[3]; | |
744 | memcpy(rx_air, rx, nbytes(rxlen)); | |
745 | *txlen = 0; | |
746 | ||
747 | if (tag.pstate == HT_READY && rxlen >= 67) { | |
748 | //received uid | |
749 | if(end==true) { | |
750 | Dbprintf("authentication failed!"); | |
751 | return -1; | |
752 | } | |
753 | z = 0; | |
754 | for (i = 0; i < 10; i++) { | |
755 | for (j = 0; j < 8; j++) { | |
756 | response_bit[z] = 0; | |
757 | if ((rx[i] & ((mask << 7) >> j)) != 0) | |
758 | response_bit[z] = 1; | |
759 | z++; | |
760 | } | |
761 | } | |
762 | k = 0; | |
763 | for (i = 5; i < z; i += 2) { | |
764 | uid[k] = response_bit[i]; | |
765 | k++; | |
766 | if (k > 31) | |
767 | break; | |
768 | } | |
769 | uid1 = (uid[0] << 7) | (uid[1] << 6) | (uid[2] << 5) | (uid[3] << 4) | |
770 | | (uid[4] << 3) | (uid[5] << 2) | (uid[6] << 1) | uid[7]; | |
771 | uid2 = (uid[8] << 7) | (uid[9] << 6) | (uid[10] << 5) | (uid[11] << 4) | |
772 | | (uid[12] << 3) | (uid[13] << 2) | (uid[14] << 1) | uid[15]; | |
773 | uid3 = (uid[16] << 7) | (uid[17] << 6) | (uid[18] << 5) | (uid[19] << 4) | |
774 | | (uid[20] << 3) | (uid[21] << 2) | (uid[22] << 1) | uid[23]; | |
775 | uid4 = (uid[24] << 7) | (uid[25] << 6) | (uid[26] << 5) | (uid[27] << 4) | |
776 | | (uid[28] << 3) | (uid[29] << 2) | (uid[30] << 1) | uid[31]; | |
777 | if (DEBUG) | |
778 | Dbprintf("UID: %02X %02X %02X %02X", uid1, uid2, uid3, uid4); | |
779 | tag.uid = (uid4 << 24 | uid3 << 16 | uid2 << 8 | uid1); | |
780 | ||
781 | //select uid | |
782 | *txlen = 45; | |
783 | crc = CRC_PRESET; | |
784 | calc_crc(&crc, 0x00, 5); | |
785 | calc_crc(&crc, uid1, 8); | |
786 | calc_crc(&crc, uid2, 8); | |
787 | calc_crc(&crc, uid3, 8); | |
788 | calc_crc(&crc, uid4, 8); | |
789 | for (i = 0; i < 100; i++) { | |
790 | response_bit[i] = 0; | |
791 | } | |
792 | for (i = 0; i < 5; i++) { | |
793 | response_bit[i] = 0; | |
794 | } | |
795 | for (i = 5; i < 37; i++) { | |
796 | response_bit[i] = uid[i - 5]; | |
797 | } | |
798 | for (j = 0; j < 8; j++) { | |
799 | response_bit[i] = 0; | |
800 | if ((crc & ((mask << 7) >> j)) != 0) | |
801 | response_bit[i] = 1; | |
802 | i++; | |
803 | } | |
804 | k = 0; | |
805 | for (i = 0; i < 6; i++) { | |
806 | tx[i] = (response_bit[k] << 7) | (response_bit[k + 1] << 6) | |
807 | | (response_bit[k + 2] << 5) | (response_bit[k + 3] << 4) | |
808 | | (response_bit[k + 4] << 3) | (response_bit[k + 5] << 2) | |
809 | | (response_bit[k + 6] << 1) | response_bit[k + 7]; | |
810 | k += 8; | |
811 | } | |
812 | tag.pstate = HT_INIT; | |
813 | } else if (tag.pstate == HT_INIT && rxlen == 44) { | |
814 | // received configuration after select command | |
815 | z = 0; | |
816 | for (i = 0; i < 6; i++) { | |
817 | for (j = 0; j < 8; j++) { | |
818 | response_bit[z] = 0; | |
819 | if ((rx[i] & ((mask << 7) >> j)) != 0) | |
820 | response_bit[z] = 1; | |
821 | z++; | |
822 | } | |
823 | } | |
824 | conf_pages[0] = ((response_bit[4] << 7) | (response_bit[5] << 6) | |
825 | | (response_bit[6] << 5) | (response_bit[7] << 4) | |
826 | | (response_bit[8] << 3) | (response_bit[9] << 2) | |
827 | | (response_bit[10] << 1) | response_bit[11]); | |
828 | //check wich memorysize this tag has | |
829 | if (response_bit[10] == 0 && response_bit[11] == 0) | |
830 | tag.max_page = 32 / 32; | |
831 | if (response_bit[10] == 0 && response_bit[11] == 1) | |
832 | tag.max_page = 256 / 32; | |
833 | if (response_bit[10] == 1 && response_bit[11] == 0) | |
834 | tag.max_page = 2048 / 32; | |
835 | conf_pages[1] = ((response_bit[12] << 7) | (response_bit[13] << 6) | |
836 | | (response_bit[14] << 5) | (response_bit[15] << 4) | |
837 | | (response_bit[16] << 3) | (response_bit[17] << 2) | |
838 | | (response_bit[18] << 1) | response_bit[19]); | |
839 | tag.auth = response_bit[12]; | |
840 | tag.TTFC = response_bit[13]; | |
841 | //tag.TTFDR in response_bit[14] and response_bit[15] | |
842 | //tag.TTFM in response_bit[16] and response_bit[17] | |
843 | tag.LCON = response_bit[18]; | |
844 | tag.LKP = response_bit[19]; | |
845 | conf_pages[2] = ((response_bit[20] << 7) | (response_bit[21] << 6) | |
846 | | (response_bit[22] << 5) | (response_bit[23] << 4) | |
847 | | (response_bit[24] << 3) | (response_bit[25] << 2) | |
848 | | (response_bit[26] << 1) | response_bit[27]); | |
849 | tag.LCK7 = response_bit[20]; | |
850 | tag.LCK6 = response_bit[21]; | |
851 | tag.LCK5 = response_bit[22]; | |
852 | tag.LCK4 = response_bit[23]; | |
853 | tag.LCK3 = response_bit[24]; | |
854 | tag.LCK2 = response_bit[25]; | |
855 | tag.LCK1 = response_bit[26]; | |
856 | tag.LCK0 = response_bit[27]; | |
857 | ||
858 | if (DEBUG) | |
859 | Dbprintf("conf0: %02X conf1: %02X conf2: %02X", conf_pages[0], | |
860 | conf_pages[1], conf_pages[2]); | |
861 | if (tag.auth == 1) { | |
862 | //if the tag is in authentication mode try the key or challenge | |
863 | *txlen = 64; | |
864 | if(end!=true){ | |
865 | if(htf==02||htf==04){ //RHTS_KEY //WHTS_KEY | |
866 | state = hitag2_init(rev64(key), rev32(tag.uid), | |
867 | rev32(rnd)); | |
868 | ||
869 | for (i = 0; i < 4; i++) { | |
870 | auth_ks[i] = hitag2_byte(&state) ^ 0xff; | |
871 | } | |
872 | *txlen = 64; | |
873 | tx[0] = rnd & 0xff; | |
874 | tx[1] = (rnd >> 8) & 0xff; | |
875 | tx[2] = (rnd >> 16) & 0xff; | |
876 | tx[3] = (rnd >> 24) & 0xff; | |
877 | ||
878 | tx[4] = auth_ks[0]; | |
879 | tx[5] = auth_ks[1]; | |
880 | tx[6] = auth_ks[2]; | |
881 | tx[7] = auth_ks[3]; | |
882 | if (DEBUG) | |
883 | Dbprintf("%02X %02X %02X %02X %02X %02X %02X %02X", tx[0], | |
884 | tx[1], tx[2], tx[3], tx[4], tx[5], tx[6], tx[7]); | |
885 | } else if(htf==01 || htf==03) { //RHTS_CHALLENGE //WHTS_CHALLENGE | |
886 | for (i = 0; i < 8; i++) | |
887 | tx[i]=((NrAr>>(56-(i*8)))&0xff); | |
888 | } | |
889 | end=true; | |
890 | tag.pstate = HT_AUTHENTICATE; | |
891 | } else { | |
892 | Dbprintf("authentication failed!"); | |
893 | return -1; | |
894 | } | |
895 | } else if (tag.auth == 0) { | |
896 | tag.pstate = HT_SELECTED; | |
897 | } | |
898 | ||
899 | } else if (tag.pstate == HT_AUTHENTICATE && rxlen == 44) { | |
900 | //encrypted con2,password received. | |
901 | crc = CRC_PRESET; | |
902 | calc_crc(&crc, 0x80, 1); | |
903 | calc_crc(&crc, ((rx[0] & 0x0f) * 16 + ((rx[1] & 0xf0) / 16)), 8); | |
904 | calc_crc(&crc, ((rx[1] & 0x0f) * 16 + ((rx[2] & 0xf0) / 16)), 8); | |
905 | calc_crc(&crc, ((rx[2] & 0x0f) * 16 + ((rx[3] & 0xf0) / 16)), 8); | |
906 | calc_crc(&crc, ((rx[3] & 0x0f) * 16 + ((rx[4] & 0xf0) / 16)), 8); | |
907 | if (DEBUG) { | |
908 | Dbprintf("UID:::%X", tag.uid); | |
909 | Dbprintf("RND:::%X", rnd); | |
910 | } | |
911 | ||
912 | //decrypt password | |
913 | pwdh0=0; | |
914 | pwdl0=0; | |
915 | pwdl1=0; | |
916 | if(htf==02 || htf==04){ //RHTS_KEY //WHTS_KEY | |
917 | { | |
918 | state = hitag2_init(rev64(key), rev32(tag.uid), rev32(rnd)); | |
919 | for (i = 0; i < 5; i++) | |
920 | hitag2_byte(&state); | |
921 | pwdh0 = ((rx[1] & 0x0f) * 16 + ((rx[2] & 0xf0) / 16)) | |
922 | ^ hitag2_byte(&state); | |
923 | pwdl0 = ((rx[2] & 0x0f) * 16 + ((rx[3] & 0xf0) / 16)) | |
924 | ^ hitag2_byte(&state); | |
925 | pwdl1 = ((rx[3] & 0x0f) * 16 + ((rx[4] & 0xf0) / 16)) | |
926 | ^ hitag2_byte(&state); | |
927 | } | |
928 | ||
929 | if (DEBUG) | |
930 | Dbprintf("pwdh0 %02X pwdl0 %02X pwdl1 %02X", pwdh0, pwdl0, pwdl1); | |
931 | ||
932 | ||
933 | //Dbprintf("%X %02X", rnd, ((rx[4] & 0x0f) * 16) + ((rx[5] & 0xf0) / 16)); | |
934 | //rnd += 1; | |
935 | } | |
936 | tag.pstate = HT_SELECTED; //tag is now ready for read/write commands | |
937 | } | |
938 | return 0; | |
939 | ||
940 | } | |
941 | ||
942 | /* | |
943 | * Emulates a Hitag S Tag with the given data from the .hts file | |
944 | */ | |
945 | void SimulateHitagSTag(bool tag_mem_supplied, byte_t* data) { | |
946 | int frame_count; | |
947 | int response; | |
948 | int overflow; | |
949 | int i, j; | |
950 | byte_t rx[HITAG_FRAME_LEN]; | |
951 | size_t rxlen = 0; | |
952 | //bool bQuitTraceFull = false; | |
953 | bQuiet = false; | |
954 | byte_t txbuf[HITAG_FRAME_LEN]; | |
955 | byte_t* tx = txbuf; | |
956 | size_t txlen = 0; | |
957 | BigBuf_free(); | |
958 | ||
959 | // Clean up trace and prepare it for storing frames | |
960 | set_tracing(TRUE); | |
961 | clear_trace(); | |
962 | ||
963 | DbpString("Starting HitagS simulation"); | |
964 | LED_D_ON(); | |
965 | ||
966 | tag.pstate = HT_READY; | |
967 | tag.tstate = HT_NO_OP; | |
968 | tag.tstate = HT_NO_OP; | |
969 | for (i = 0; i < 16; i++) | |
970 | for (j = 0; j < 4; j++) | |
971 | tag.pages[i][j] = 0x0; | |
972 | //read tag data into memory | |
973 | if (tag_mem_supplied) { | |
974 | DbpString("Loading hitagS memory..."); | |
975 | memcpy((byte_t*)tag.pages,data,4*64); | |
976 | } | |
977 | tag.uid=(uint32_t)tag.pages[0]; | |
978 | Dbprintf("Hitag S simulation started"); | |
979 | tag.key=(intptr_t)tag.pages[3]; | |
980 | tag.key<<=16; | |
981 | tag.key+=((tag.pages[2][0])<<8)+tag.pages[2][1]; | |
982 | tag.pwdl0=tag.pages[2][3]; | |
983 | tag.pwdl1=tag.pages[2][2]; | |
984 | tag.pwdh0=tag.pages[1][0]; | |
985 | //con0 | |
986 | tag.max_page=64; | |
987 | if((tag.pages[1][3]&0x2)==0 && (tag.pages[1][3]&0x1)==1) | |
988 | tag.max_page=8; | |
989 | if((tag.pages[1][3]&0x2)==0 && (tag.pages[1][3]&0x1)==0) | |
990 | tag.max_page=0; | |
991 | //con1 | |
992 | tag.auth=0; | |
993 | if((tag.pages[1][2]&0x80)==1) | |
994 | tag.auth=1; | |
995 | tag.LCON=0; | |
996 | if((tag.pages[1][2]&0x2)==1) | |
997 | tag.LCON=1; | |
998 | tag.LKP=0; | |
999 | if((tag.pages[1][2]&0x1)==1) | |
1000 | tag.LKP=1; | |
1001 | //con2 | |
1002 | //0=read write 1=read only | |
1003 | tag.LCK7=0; | |
1004 | if((tag.pages[1][1]&0x80)==1) | |
1005 | tag.LCK7=1; | |
1006 | tag.LCK6=0; | |
1007 | if((tag.pages[1][1]&0x40)==1) | |
1008 | tag.LCK6=1; | |
1009 | tag.LCK5=0; | |
1010 | if((tag.pages[1][1]&0x20)==1) | |
1011 | tag.LCK5=1; | |
1012 | tag.LCK4=0; | |
1013 | if((tag.pages[1][1]&0x10)==1) | |
1014 | tag.LCK4=1; | |
1015 | tag.LCK3=0; | |
1016 | if((tag.pages[1][1]&0x8)==1) | |
1017 | tag.LCK3=1; | |
1018 | tag.LCK2=0; | |
1019 | if((tag.pages[1][1]&0x4)==1) | |
1020 | tag.LCK2=1; | |
1021 | tag.LCK1=0; | |
1022 | if((tag.pages[1][1]&0x2)==1) | |
1023 | tag.LCK1=1; | |
1024 | tag.LCK0=0; | |
1025 | if((tag.pages[1][1]&0x1)==1) | |
1026 | tag.LCK0=1; | |
1027 | ||
1028 | // Set up simulator mode, frequency divisor which will drive the FPGA | |
1029 | // and analog mux selection. | |
1030 | FpgaDownloadAndGo(FPGA_BITSTREAM_LF); | |
1031 | FpgaWriteConfWord( | |
1032 | FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD); | |
1033 | FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz | |
1034 | SetAdcMuxFor(GPIO_MUXSEL_LOPKD); | |
1035 | RELAY_OFF(); | |
1036 | ||
1037 | // Configure output pin that is connected to the FPGA (for modulating) | |
1038 | AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; | |
1039 | AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; | |
1040 | ||
1041 | // Disable modulation at default, which means release resistance | |
1042 | LOW(GPIO_SSC_DOUT); | |
1043 | ||
1044 | // Enable Peripheral Clock for TIMER_CLOCK0, used to measure exact timing before answering | |
1045 | AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC0); | |
1046 | ||
1047 | // Enable Peripheral Clock for TIMER_CLOCK1, used to capture edges of the reader frames | |
1048 | AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1); | |
1049 | AT91C_BASE_PIOA->PIO_BSR = GPIO_SSC_FRAME; | |
1050 | ||
1051 | // Disable timer during configuration | |
1052 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; | |
1053 | ||
1054 | // Capture mode, default timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, | |
1055 | // external trigger rising edge, load RA on rising edge of TIOA. | |
1056 | AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK | |
1057 | | AT91C_TC_ETRGEDG_RISING | AT91C_TC_ABETRG | AT91C_TC_LDRA_RISING; | |
1058 | ||
1059 | // Reset the received frame, frame count and timing info | |
1060 | memset(rx, 0x00, sizeof(rx)); | |
1061 | frame_count = 0; | |
1062 | response = 0; | |
1063 | overflow = 0; | |
1064 | ||
1065 | // Enable and reset counter | |
1066 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; | |
1067 | ||
1068 | while (!BUTTON_PRESS()) { | |
1069 | // Watchdog hit | |
1070 | WDT_HIT(); | |
1071 | ||
1072 | // Receive frame, watch for at most T0*EOF periods | |
1073 | while (AT91C_BASE_TC1->TC_CV < T0 * HITAG_T_EOF) { | |
1074 | // Check if rising edge in modulation is detected | |
1075 | if (AT91C_BASE_TC1->TC_SR & AT91C_TC_LDRAS) { | |
1076 | // Retrieve the new timing values | |
1077 | int ra = (AT91C_BASE_TC1->TC_RA / T0) + overflow; | |
1078 | overflow = 0; | |
1079 | ||
1080 | // Reset timer every frame, we have to capture the last edge for timing | |
1081 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; | |
1082 | ||
1083 | LED_B_ON(); | |
1084 | ||
1085 | // Capture reader frame | |
1086 | if (ra >= HITAG_T_STOP) { | |
1087 | if (rxlen != 0) { | |
1088 | //DbpString("wierd0?"); | |
1089 | } | |
1090 | // Capture the T0 periods that have passed since last communication or field drop (reset) | |
1091 | response = (ra - HITAG_T_LOW); | |
1092 | } else if (ra >= HITAG_T_1_MIN) { | |
1093 | // '1' bit | |
1094 | rx[rxlen / 8] |= 1 << (7 - (rxlen % 8)); | |
1095 | rxlen++; | |
1096 | } else if (ra >= HITAG_T_0_MIN) { | |
1097 | // '0' bit | |
1098 | rx[rxlen / 8] |= 0 << (7 - (rxlen % 8)); | |
1099 | rxlen++; | |
1100 | } else { | |
1101 | // Ignore wierd value, is to small to mean anything | |
1102 | } | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | // Check if frame was captured | |
1107 | if (rxlen > 0) { | |
1108 | frame_count++; | |
1109 | if (!bQuiet) { | |
1110 | if (!LogTraceHitag(rx, rxlen, response, 0, true)) { | |
1111 | DbpString("Trace full"); | |
1112 | clear_trace(); | |
1113 | } | |
1114 | } | |
1115 | ||
1116 | // Disable timer 1 with external trigger to avoid triggers during our own modulation | |
1117 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; | |
1118 | ||
1119 | // Process the incoming frame (rx) and prepare the outgoing frame (tx) | |
1120 | hitagS_handle_reader_command(rx, rxlen, tx, &txlen); | |
1121 | ||
1122 | // Wait for HITAG_T_WAIT_1 carrier periods after the last reader bit, | |
1123 | // not that since the clock counts since the rising edge, but T_Wait1 is | |
1124 | // with respect to the falling edge, we need to wait actually (T_Wait1 - T_Low) | |
1125 | // periods. The gap time T_Low varies (4..10). All timer values are in | |
1126 | // terms of T0 units | |
1127 | while (AT91C_BASE_TC0->TC_CV < T0 * (HITAG_T_WAIT_1 - HITAG_T_LOW)) | |
1128 | ; | |
1129 | ||
1130 | // Send and store the tag answer (if there is any) | |
1131 | if (txlen > 0) { | |
1132 | // Transmit the tag frame | |
1133 | hitag_send_frame(tx, txlen); | |
1134 | // Store the frame in the trace | |
1135 | if (!bQuiet) { | |
1136 | if (!LogTraceHitag(tx, txlen, 0, 0, false)) { | |
1137 | DbpString("Trace full"); | |
1138 | clear_trace(); | |
1139 | } | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | // Reset the received frame and response timing info | |
1144 | memset(rx, 0x00, sizeof(rx)); | |
1145 | response = 0; | |
1146 | ||
1147 | // Enable and reset external trigger in timer for capturing future frames | |
1148 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; | |
1149 | LED_B_OFF(); | |
1150 | } | |
1151 | // Reset the frame length | |
1152 | rxlen = 0; | |
1153 | // Save the timer overflow, will be 0 when frame was received | |
1154 | overflow += (AT91C_BASE_TC1->TC_CV / T0); | |
1155 | // Reset the timer to restart while-loop that receives frames | |
1156 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_SWTRG; | |
1157 | } | |
1158 | LED_B_OFF(); | |
1159 | LED_D_OFF(); | |
1160 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; | |
1161 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; | |
1162 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | * Authenticates to the Tag with the given key or challenge. | |
1167 | * If the key was given the password will be decrypted. | |
1168 | * Reads every page of a hitag S transpoder. | |
1169 | */ | |
1170 | void ReadHitagS(hitag_function htf, hitag_data* htd) { | |
1171 | int i, j, z, k; | |
1172 | int frame_count; | |
1173 | int response_bit[200]; | |
1174 | int response; | |
1175 | byte_t rx[HITAG_FRAME_LEN]; | |
1176 | size_t rxlen = 0; | |
1177 | byte_t txbuf[HITAG_FRAME_LEN]; | |
1178 | byte_t* tx = txbuf; | |
1179 | size_t txlen = 0; | |
1180 | int lastbit; | |
1181 | bool bSkip; | |
1182 | int reset_sof; | |
1183 | int tag_sof; | |
1184 | int t_wait = HITAG_T_WAIT_MAX; | |
1185 | bool bStop; | |
1186 | bool bQuitTraceFull = false; | |
1187 | int sendNum = 0; | |
1188 | unsigned char mask = 1; | |
1189 | unsigned char crc; | |
1190 | unsigned char pageData[32]; | |
1191 | page_to_be_written = 0; | |
1192 | ||
1193 | //read given key/challenge | |
1194 | byte_t NrAr_[8]; | |
1195 | uint64_t key=0; | |
1196 | uint64_t NrAr=0; | |
1197 | byte_t key_[6]; | |
1198 | switch(htf) { | |
1199 | case 01: { //RHTS_CHALLENGE | |
1200 | DbpString("Authenticating using nr,ar pair:"); | |
1201 | memcpy(NrAr_,htd->auth.NrAr,8); | |
1202 | Dbhexdump(8,NrAr_,false); | |
1203 | NrAr=NrAr_[7] | ((uint64_t)NrAr_[6]) << 8 | ((uint64_t)NrAr_[5]) << 16 | ((uint64_t)NrAr_[4]) << 24 | ((uint64_t)NrAr_[3]) << 32 | | |
1204 | ((uint64_t)NrAr_[2]) << 40| ((uint64_t)NrAr_[1]) << 48 | ((uint64_t)NrAr_[0]) << 56; | |
1205 | } break; | |
1206 | case 02: { //RHTS_KEY | |
1207 | DbpString("Authenticating using key:"); | |
1208 | memcpy(key_,htd->crypto.key,6); | |
1209 | Dbhexdump(6,key_,false); | |
1210 | key=key_[5] | ((uint64_t)key_[4]) << 8 | ((uint64_t)key_[3]) << 16 | ((uint64_t)key_[2]) << 24 | ((uint64_t)key_[1]) << 32 | ((uint64_t)key_[0]) << 40; | |
1211 | } break; | |
1212 | default: { | |
1213 | Dbprintf("Error , unknown function: %d",htf); | |
1214 | return; | |
1215 | } break; | |
1216 | } | |
1217 | ||
1218 | ||
1219 | ||
1220 | FpgaDownloadAndGo(FPGA_BITSTREAM_LF); | |
1221 | // Reset the return status | |
1222 | bSuccessful = false; | |
1223 | ||
1224 | // Clean up trace and prepare it for storing frames | |
1225 | set_tracing(TRUE); | |
1226 | clear_trace(); | |
1227 | ||
1228 | bQuiet = false; | |
1229 | bQuitTraceFull = true; | |
1230 | ||
1231 | LED_D_ON(); | |
1232 | ||
1233 | // Configure output and enable pin that is connected to the FPGA (for modulating) | |
1234 | AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; | |
1235 | AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; | |
1236 | ||
1237 | // Set fpga in edge detect with reader field, we can modulate as reader now | |
1238 | FpgaWriteConfWord( | |
1239 | FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD); | |
1240 | ||
1241 | // Set Frequency divisor which will drive the FPGA and analog mux selection | |
1242 | FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz | |
1243 | SetAdcMuxFor(GPIO_MUXSEL_LOPKD); | |
1244 | RELAY_OFF(); | |
1245 | ||
1246 | // Disable modulation at default, which means enable the field | |
1247 | LOW(GPIO_SSC_DOUT); | |
1248 | ||
1249 | // Give it a bit of time for the resonant antenna to settle. | |
1250 | SpinDelay(30); | |
1251 | ||
1252 | // Enable Peripheral Clock for TIMER_CLOCK0, used to measure exact timing before answering | |
1253 | AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC0); | |
1254 | ||
1255 | // Enable Peripheral Clock for TIMER_CLOCK1, used to capture edges of the tag frames | |
1256 | AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1); | |
1257 | AT91C_BASE_PIOA->PIO_BSR = GPIO_SSC_FRAME; | |
1258 | ||
1259 | // Disable timer during configuration | |
1260 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; | |
1261 | ||
1262 | // Capture mode, defaul timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, | |
1263 | // external trigger rising edge, load RA on falling edge of TIOA. | |
1264 | AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK | |
1265 | ||
1266 | | AT91C_TC_ETRGEDG_FALLING | AT91C_TC_ABETRG | AT91C_TC_LDRA_FALLING; | |
1267 | ||
1268 | // Enable and reset counters | |
1269 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; | |
1270 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; | |
1271 | ||
1272 | // Reset the received frame, frame count and timing info | |
1273 | frame_count = 0; | |
1274 | response = 0; | |
1275 | lastbit = 1; | |
1276 | bStop = false; | |
1277 | ||
1278 | reset_sof = 1; | |
1279 | t_wait = 200; | |
1280 | ||
1281 | while (!bStop && !BUTTON_PRESS()) { | |
1282 | // Watchdog hit | |
1283 | WDT_HIT(); | |
1284 | ||
1285 | // Check if frame was captured and store it | |
1286 | if (rxlen > 0) { | |
1287 | frame_count++; | |
1288 | if (!bQuiet) { | |
1289 | if (!LogTraceHitag(rx, rxlen, response, 0, false)) { | |
1290 | DbpString("Trace full"); | |
1291 | if (bQuitTraceFull) { | |
1292 | break; | |
1293 | } else { | |
1294 | bQuiet = true; | |
1295 | } | |
1296 | } | |
1297 | } | |
1298 | } | |
1299 | ||
1300 | // By default reset the transmission buffer | |
1301 | tx = txbuf; | |
1302 | txlen = 0; | |
1303 | ||
1304 | if (rxlen == 0) { | |
1305 | //start authentication | |
1306 | txlen = 5; | |
1307 | memcpy(tx, "\xc0", nbytes(txlen)); | |
1308 | tag.pstate = HT_READY; | |
1309 | tag.tstate = HT_NO_OP; | |
1310 | } else if (tag.pstate != HT_SELECTED) { | |
1311 | if (hitagS_handle_tag_auth(htf, key,NrAr,rx, rxlen, tx, &txlen) == -1) | |
1312 | bStop = !false; | |
1313 | } | |
1314 | if (tag.pstate == HT_SELECTED && tag.tstate == HT_NO_OP && rxlen > 0) { | |
1315 | //send read request | |
1316 | tag.tstate = HT_READING_PAGE; | |
1317 | txlen = 20; | |
1318 | crc = CRC_PRESET; | |
1319 | tx[0] = 0xc0 + (sendNum / 16); | |
1320 | calc_crc(&crc, tx[0], 8); | |
1321 | calc_crc(&crc, 0x00 + ((sendNum % 16) * 16), 4); | |
1322 | tx[1] = 0x00 + ((sendNum % 16) * 16) + (crc / 16); | |
1323 | tx[2] = 0x00 + (crc % 16) * 16; | |
1324 | } else if (tag.pstate == HT_SELECTED && tag.tstate == HT_READING_PAGE | |
1325 | && rxlen > 0) { | |
1326 | //save received data | |
1327 | z = 0; | |
1328 | for (i = 0; i < 5; i++) { | |
1329 | for (j = 0; j < 8; j++) { | |
1330 | response_bit[z] = 0; | |
1331 | if ((rx[i] & ((mask << 7) >> j)) != 0) | |
1332 | response_bit[z] = 1; | |
1333 | z++; | |
1334 | } | |
1335 | } | |
1336 | k = 0; | |
1337 | for (i = 4; i < 36; i++) { | |
1338 | pageData[k] = response_bit[i]; | |
1339 | k++; | |
1340 | } | |
1341 | for (i = 0; i < 4; i++) | |
1342 | tag.pages[sendNum / 4][sendNum % 4] = 0x0; | |
1343 | for (i = 0; i < 4; i++) { | |
1344 | tag.pages[sendNum / 4][sendNum % 4] += ((pageData[i * 8] << 7) | |
1345 | | (pageData[1 + (i * 8)] << 6) | |
1346 | | (pageData[2 + (i * 8)] << 5) | |
1347 | | (pageData[3 + (i * 8)] << 4) | |
1348 | | (pageData[4 + (i * 8)] << 3) | |
1349 | | (pageData[5 + (i * 8)] << 2) | |
1350 | | (pageData[6 + (i * 8)] << 1) | pageData[7 + (i * 8)]) | |
1351 | << (i * 8); | |
1352 | } | |
1353 | if (tag.auth && tag.LKP && sendNum == 1) { | |
1354 | Dbprintf("Page[%2d]: %02X %02X %02X %02X", sendNum, pwdh0, | |
1355 | (tag.pages[sendNum / 4][sendNum % 4] >> 16) & 0xff, | |
1356 | (tag.pages[sendNum / 4][sendNum % 4] >> 8) & 0xff, | |
1357 | tag.pages[sendNum / 4][sendNum % 4] & 0xff); | |
1358 | } else { | |
1359 | Dbprintf("Page[%2d]: %02X %02X %02X %02X", sendNum, | |
1360 | (tag.pages[sendNum / 4][sendNum % 4] >> 24) & 0xff, | |
1361 | (tag.pages[sendNum / 4][sendNum % 4] >> 16) & 0xff, | |
1362 | (tag.pages[sendNum / 4][sendNum % 4] >> 8) & 0xff, | |
1363 | tag.pages[sendNum / 4][sendNum % 4] & 0xff); | |
1364 | } | |
1365 | ||
1366 | sendNum++; | |
1367 | //display key and password if possible | |
1368 | if (sendNum == 2 && tag.auth == 1 && tag.LKP) { | |
1369 | if (htf == 02) { //RHTS_KEY | |
1370 | Dbprintf("Page[ 2]: %02X %02X %02X %02X", | |
1371 | (byte_t)(key >> 8) & 0xff, | |
1372 | (byte_t) key & 0xff, pwdl1, pwdl0); | |
1373 | Dbprintf("Page[ 3]: %02X %02X %02X %02X", | |
1374 | (byte_t)(key >> 40) & 0xff, | |
1375 | (byte_t)(key >> 32) & 0xff, | |
1376 | (byte_t)(key >> 24) & 0xff, | |
1377 | (byte_t)(key >> 16) & 0xff); | |
1378 | } else { | |
1379 | //if the authentication is done with a challenge the key and password are unknown | |
1380 | Dbprintf("Page[ 2]: __ __ __ __"); | |
1381 | Dbprintf("Page[ 3]: __ __ __ __"); | |
1382 | } | |
1383 | } | |
1384 | ||
1385 | txlen = 20; | |
1386 | crc = CRC_PRESET; | |
1387 | tx[0] = 0xc0 + (sendNum / 16); | |
1388 | calc_crc(&crc, tx[0], 8); | |
1389 | calc_crc(&crc, 0x00 + ((sendNum % 16) * 16), 4); | |
1390 | tx[1] = 0x00 + ((sendNum % 16) * 16) + (crc / 16); | |
1391 | tx[2] = 0x00 + (crc % 16) * 16; | |
1392 | if (sendNum >= tag.max_page) { | |
1393 | bStop = !false; | |
1394 | } | |
1395 | } | |
1396 | ||
1397 | // Send and store the reader command | |
1398 | // Disable timer 1 with external trigger to avoid triggers during our own modulation | |
1399 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; | |
1400 | ||
1401 | // Wait for HITAG_T_WAIT_2 carrier periods after the last tag bit before transmitting, | |
1402 | // Since the clock counts since the last falling edge, a 'one' means that the | |
1403 | // falling edge occured halfway the period. with respect to this falling edge, | |
1404 | // we need to wait (T_Wait2 + half_tag_period) when the last was a 'one'. | |
1405 | // All timer values are in terms of T0 units | |
1406 | ||
1407 | while (AT91C_BASE_TC0->TC_CV | |
1408 | < T0 * (t_wait + (HITAG_T_TAG_HALF_PERIOD * lastbit))) | |
1409 | ; | |
1410 | ||
1411 | // Transmit the reader frame | |
1412 | hitag_reader_send_frame(tx, txlen); | |
1413 | ||
1414 | // Enable and reset external trigger in timer for capturing future frames | |
1415 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; | |
1416 | ||
1417 | // Add transmitted frame to total count | |
1418 | if (txlen > 0) { | |
1419 | frame_count++; | |
1420 | if (!bQuiet) { | |
1421 | // Store the frame in the trace | |
1422 | if (!LogTraceHitag(tx, txlen, HITAG_T_WAIT_2, 0, true)) { | |
1423 | if (bQuitTraceFull) { | |
1424 | DbpString("Trace full"); | |
1425 | break; | |
1426 | } else { | |
1427 | bQuiet = true; | |
1428 | } | |
1429 | } | |
1430 | } | |
1431 | } | |
1432 | ||
1433 | // Reset values for receiving frames | |
1434 | memset(rx, 0x00, sizeof(rx)); | |
1435 | rxlen = 0; | |
1436 | lastbit = 1; | |
1437 | bSkip = true; | |
1438 | tag_sof = reset_sof; | |
1439 | response = 0; | |
1440 | ||
1441 | // Receive frame, watch for at most T0*EOF periods | |
1442 | while (AT91C_BASE_TC1->TC_CV < T0 * HITAG_T_WAIT_MAX) { | |
1443 | // Check if falling edge in tag modulation is detected | |
1444 | if (AT91C_BASE_TC1->TC_SR & AT91C_TC_LDRAS) { | |
1445 | // Retrieve the new timing values | |
1446 | int ra = (AT91C_BASE_TC1->TC_RA / T0); | |
1447 | ||
1448 | // Reset timer every frame, we have to capture the last edge for timing | |
1449 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; | |
1450 | ||
1451 | LED_B_ON(); | |
1452 | ||
1453 | // Capture tag frame (manchester decoding using only falling edges) | |
1454 | if (ra >= HITAG_T_EOF) { | |
1455 | if (rxlen != 0) { | |
1456 | //DbpString("wierd1?"); | |
1457 | } | |
1458 | // Capture the T0 periods that have passed since last communication or field drop (reset) | |
1459 | // We always recieve a 'one' first, which has the falling edge after a half period |-_| | |
1460 | response = ra - HITAG_T_TAG_HALF_PERIOD; | |
1461 | } else if (ra >= HITAG_T_TAG_CAPTURE_FOUR_HALF) { | |
1462 | // Manchester coding example |-_|_-|-_| (101) | |
1463 | rx[rxlen / 8] |= 0 << (7 - (rxlen % 8)); | |
1464 | rxlen++; | |
1465 | rx[rxlen / 8] |= 1 << (7 - (rxlen % 8)); | |
1466 | rxlen++; | |
1467 | } else if (ra >= HITAG_T_TAG_CAPTURE_THREE_HALF) { | |
1468 | // Manchester coding example |_-|...|_-|-_| (0...01) | |
1469 | rx[rxlen / 8] |= 0 << (7 - (rxlen % 8)); | |
1470 | rxlen++; | |
1471 | // We have to skip this half period at start and add the 'one' the second time | |
1472 | if (!bSkip) { | |
1473 | rx[rxlen / 8] |= 1 << (7 - (rxlen % 8)); | |
1474 | rxlen++; | |
1475 | } | |
1476 | lastbit = !lastbit; | |
1477 | bSkip = !bSkip; | |
1478 | } else if (ra >= HITAG_T_TAG_CAPTURE_TWO_HALF) { | |
1479 | // Manchester coding example |_-|_-| (00) or |-_|-_| (11) | |
1480 | if (tag_sof) { | |
1481 | // Ignore bits that are transmitted during SOF | |
1482 | tag_sof--; | |
1483 | } else { | |
1484 | // bit is same as last bit | |
1485 | rx[rxlen / 8] |= lastbit << (7 - (rxlen % 8)); | |
1486 | rxlen++; | |
1487 | } | |
1488 | } else { | |
1489 | // Ignore wierd value, is to small to mean anything | |
1490 | } | |
1491 | } | |
1492 | ||
1493 | // We can break this loop if we received the last bit from a frame | |
1494 | if (AT91C_BASE_TC1->TC_CV > T0 * HITAG_T_EOF) { | |
1495 | if (rxlen > 0) | |
1496 | break; | |
1497 | } | |
1498 | } | |
1499 | } | |
1500 | end=false; | |
1501 | LED_B_OFF(); | |
1502 | LED_D_OFF(); | |
1503 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; | |
1504 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; | |
1505 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1506 | cmd_send(CMD_ACK, bSuccessful, 0, 0, 0, 0); | |
1507 | } | |
1508 | ||
1509 | /* | |
1510 | * Authenticates to the Tag with the given Key or Challenge. | |
1511 | * Writes the given 32Bit data into page_ | |
1512 | */ | |
1513 | void WritePageHitagS(hitag_function htf, hitag_data* htd,int page_) { | |
1514 | int frame_count; | |
1515 | int response; | |
1516 | byte_t rx[HITAG_FRAME_LEN]; | |
1517 | size_t rxlen = 0; | |
1518 | byte_t txbuf[HITAG_FRAME_LEN]; | |
1519 | byte_t* tx = txbuf; | |
1520 | size_t txlen = 0; | |
1521 | int lastbit; | |
1522 | bool bSkip; | |
1523 | int reset_sof; | |
1524 | int tag_sof; | |
1525 | int t_wait = HITAG_T_WAIT_MAX; | |
1526 | bool bStop; | |
1527 | bool bQuitTraceFull = false; | |
1528 | int page = page_; | |
1529 | unsigned char crc; | |
1530 | byte_t data[4]= {0,0,0,0}; | |
1531 | ||
1532 | //read given key/challenge, the page and the data | |
1533 | byte_t NrAr_[8]; | |
1534 | uint64_t key=0; | |
1535 | uint64_t NrAr=0; | |
1536 | byte_t key_[6]; | |
1537 | switch(htf) { | |
1538 | case 03: { //WHTS_CHALLENGE | |
1539 | memcpy(data,htd->auth.data,4); | |
1540 | DbpString("Authenticating using nr,ar pair:"); | |
1541 | memcpy(NrAr_,htd->auth.NrAr,8); | |
1542 | Dbhexdump(8,NrAr_,false); | |
1543 | NrAr=NrAr_[7] | ((uint64_t)NrAr_[6]) << 8 | ((uint64_t)NrAr_[5]) << 16 | ((uint64_t)NrAr_[4]) << 24 | ((uint64_t)NrAr_[3]) << 32 | | |
1544 | ((uint64_t)NrAr_[2]) << 40| ((uint64_t)NrAr_[1]) << 48 | ((uint64_t)NrAr_[0]) << 56; | |
1545 | } break; | |
1546 | case 04: { //WHTS_KEY | |
1547 | memcpy(data,htd->crypto.data,4); | |
1548 | DbpString("Authenticating using key:"); | |
1549 | memcpy(key_,htd->crypto.key,6); | |
1550 | Dbhexdump(6,key_,false); | |
1551 | key=key_[5] | ((uint64_t)key_[4]) << 8 | ((uint64_t)key_[3]) << 16 | ((uint64_t)key_[2]) << 24 | ((uint64_t)key_[1]) << 32 | ((uint64_t)key_[0]) << 40; | |
1552 | } break; | |
1553 | default: { | |
1554 | Dbprintf("Error , unknown function: %d",htf); | |
1555 | return; | |
1556 | } break; | |
1557 | } | |
1558 | ||
1559 | Dbprintf("Page: %d",page_); | |
1560 | Dbprintf("DATA: %02X %02X %02X %02X", data[0], data[1], data[2], data[3]); | |
1561 | FpgaDownloadAndGo(FPGA_BITSTREAM_LF); | |
1562 | // Reset the return status | |
1563 | bSuccessful = false; | |
1564 | ||
1565 | tag.pstate = HT_READY; | |
1566 | tag.tstate = HT_NO_OP; | |
1567 | ||
1568 | // Clean up trace and prepare it for storing frames | |
1569 | set_tracing(TRUE); | |
1570 | clear_trace(); | |
1571 | ||
1572 | bQuiet = false; | |
1573 | bQuitTraceFull = true; | |
1574 | ||
1575 | LED_D_ON(); | |
1576 | ||
1577 | // Configure output and enable pin that is connected to the FPGA (for modulating) | |
1578 | AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; | |
1579 | AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; | |
1580 | ||
1581 | // Set fpga in edge detect with reader field, we can modulate as reader now | |
1582 | FpgaWriteConfWord( | |
1583 | FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD); | |
1584 | ||
1585 | // Set Frequency divisor which will drive the FPGA and analog mux selection | |
1586 | FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz | |
1587 | SetAdcMuxFor(GPIO_MUXSEL_LOPKD); | |
1588 | RELAY_OFF(); | |
1589 | ||
1590 | // Disable modulation at default, which means enable the field | |
1591 | LOW(GPIO_SSC_DOUT); | |
1592 | ||
1593 | // Give it a bit of time for the resonant antenna to settle. | |
1594 | SpinDelay(30); | |
1595 | ||
1596 | // Enable Peripheral Clock for TIMER_CLOCK0, used to measure exact timing before answering | |
1597 | AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC0); | |
1598 | ||
1599 | // Enable Peripheral Clock for TIMER_CLOCK1, used to capture edges of the tag frames | |
1600 | AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1); | |
1601 | AT91C_BASE_PIOA->PIO_BSR = GPIO_SSC_FRAME; | |
1602 | ||
1603 | // Disable timer during configuration | |
1604 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; | |
1605 | ||
1606 | // Capture mode, defaul timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, | |
1607 | // external trigger rising edge, load RA on falling edge of TIOA. | |
1608 | AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK | |
1609 | | AT91C_TC_ETRGEDG_FALLING | AT91C_TC_ABETRG | |
1610 | | AT91C_TC_LDRA_FALLING; | |
1611 | ||
1612 | // Enable and reset counters | |
1613 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; | |
1614 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; | |
1615 | ||
1616 | // Reset the received frame, frame count and timing info | |
1617 | frame_count = 0; | |
1618 | response = 0; | |
1619 | lastbit = 1; | |
1620 | bStop = false; | |
1621 | ||
1622 | reset_sof = 1; | |
1623 | t_wait = 200; | |
1624 | ||
1625 | while (!bStop && !BUTTON_PRESS()) { | |
1626 | // Watchdog hit | |
1627 | WDT_HIT(); | |
1628 | ||
1629 | // Check if frame was captured and store it | |
1630 | if (rxlen > 0) { | |
1631 | frame_count++; | |
1632 | if (!bQuiet) { | |
1633 | if (!LogTraceHitag(rx, rxlen, response, 0, false)) { | |
1634 | DbpString("Trace full"); | |
1635 | if (bQuitTraceFull) { | |
1636 | break; | |
1637 | } else { | |
1638 | bQuiet = true; | |
1639 | } | |
1640 | } | |
1641 | } | |
1642 | } | |
1643 | ||
1644 | //check for valid input | |
1645 | if (page == 0) { | |
1646 | Dbprintf( | |
1647 | "usage: lf hitag writer [03 | 04] [CHALLENGE | KEY] [page] [byte0] [byte1] [byte2] [byte3]"); | |
1648 | bStop = !false; | |
1649 | } | |
1650 | ||
1651 | // By default reset the transmission buffer | |
1652 | tx = txbuf; | |
1653 | txlen = 0; | |
1654 | ||
1655 | if (rxlen == 0 && tag.tstate == HT_WRITING_PAGE_ACK) { | |
1656 | //no write access on this page | |
1657 | Dbprintf("no write access on page %d", page_); | |
1658 | bStop = !false; | |
1659 | } else if (rxlen == 0 && tag.tstate != HT_WRITING_PAGE_DATA) { | |
1660 | //start the authetication | |
1661 | txlen = 5; | |
1662 | memcpy(tx, "\xc0", nbytes(txlen)); | |
1663 | tag.pstate = HT_READY; | |
1664 | tag.tstate = HT_NO_OP; | |
1665 | } else if (tag.pstate != HT_SELECTED) { | |
1666 | //try to authenticate with the given key or challenge | |
1667 | if (hitagS_handle_tag_auth(htf,key,NrAr,rx, rxlen, tx, &txlen) == -1) | |
1668 | bStop = !false; | |
1669 | } | |
1670 | if (tag.pstate == HT_SELECTED && tag.tstate == HT_NO_OP && rxlen > 0) { | |
1671 | //check if the given page exists | |
1672 | if (page > tag.max_page) { | |
1673 | Dbprintf("page number too big"); | |
1674 | bStop = !false; | |
1675 | } | |
1676 | //ask Tag for write permission | |
1677 | tag.tstate = HT_WRITING_PAGE_ACK; | |
1678 | txlen = 20; | |
1679 | crc = CRC_PRESET; | |
1680 | tx[0] = 0x90 + (page / 16); | |
1681 | calc_crc(&crc, tx[0], 8); | |
1682 | calc_crc(&crc, 0x00 + ((page % 16) * 16), 4); | |
1683 | tx[1] = 0x00 + ((page % 16) * 16) + (crc / 16); | |
1684 | tx[2] = 0x00 + (crc % 16) * 16; | |
1685 | } else if (tag.pstate == HT_SELECTED && tag.tstate == HT_WRITING_PAGE_ACK | |
1686 | && rxlen == 6 && rx[0] == 0xf4) { | |
1687 | //ACK recieved to write the page. send data | |
1688 | tag.tstate = HT_WRITING_PAGE_DATA; | |
1689 | txlen = 40; | |
1690 | crc = CRC_PRESET; | |
1691 | calc_crc(&crc, data[3], 8); | |
1692 | calc_crc(&crc, data[2], 8); | |
1693 | calc_crc(&crc, data[1], 8); | |
1694 | calc_crc(&crc, data[0], 8); | |
1695 | tx[0] = data[3]; | |
1696 | tx[1] = data[2]; | |
1697 | tx[2] = data[1]; | |
1698 | tx[3] = data[0]; | |
1699 | tx[4] = crc; | |
1700 | } else if (tag.pstate == HT_SELECTED && tag.tstate == HT_WRITING_PAGE_DATA | |
1701 | && rxlen == 6 && rx[0] == 0xf4) { | |
1702 | //received ACK | |
1703 | Dbprintf("Successful!"); | |
1704 | bStop = !false; | |
1705 | } | |
1706 | ||
1707 | // Send and store the reader command | |
1708 | // Disable timer 1 with external trigger to avoid triggers during our own modulation | |
1709 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; | |
1710 | ||
1711 | // Wait for HITAG_T_WAIT_2 carrier periods after the last tag bit before transmitting, | |
1712 | // Since the clock counts since the last falling edge, a 'one' means that the | |
1713 | // falling edge occured halfway the period. with respect to this falling edge, | |
1714 | // we need to wait (T_Wait2 + half_tag_period) when the last was a 'one'. | |
1715 | // All timer values are in terms of T0 units | |
1716 | ||
1717 | while (AT91C_BASE_TC0->TC_CV | |
1718 | < T0 * (t_wait + (HITAG_T_TAG_HALF_PERIOD * lastbit))) | |
1719 | ; | |
1720 | ||
1721 | // Transmit the reader frame | |
1722 | hitag_reader_send_frame(tx, txlen); | |
1723 | ||
1724 | // Enable and reset external trigger in timer for capturing future frames | |
1725 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; | |
1726 | ||
1727 | // Add transmitted frame to total count | |
1728 | if (txlen > 0) { | |
1729 | frame_count++; | |
1730 | if (!bQuiet) { | |
1731 | // Store the frame in the trace | |
1732 | if (!LogTraceHitag(tx, txlen, HITAG_T_WAIT_2, 0, true)) { | |
1733 | if (bQuitTraceFull) { | |
1734 | DbpString("Trace full"); | |
1735 | break; | |
1736 | } else { | |
1737 | bQuiet = true; | |
1738 | } | |
1739 | } | |
1740 | } | |
1741 | } | |
1742 | ||
1743 | // Reset values for receiving frames | |
1744 | memset(rx, 0x00, sizeof(rx)); | |
1745 | rxlen = 0; | |
1746 | lastbit = 1; | |
1747 | bSkip = true; | |
1748 | tag_sof = reset_sof; | |
1749 | response = 0; | |
1750 | ||
1751 | // Receive frame, watch for at most T0*EOF periods | |
1752 | while (AT91C_BASE_TC1->TC_CV < T0 * HITAG_T_WAIT_MAX) { | |
1753 | // Check if falling edge in tag modulation is detected | |
1754 | if (AT91C_BASE_TC1->TC_SR & AT91C_TC_LDRAS) { | |
1755 | // Retrieve the new timing values | |
1756 | int ra = (AT91C_BASE_TC1->TC_RA / T0); | |
1757 | ||
1758 | // Reset timer every frame, we have to capture the last edge for timing | |
1759 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; | |
1760 | ||
1761 | LED_B_ON(); | |
1762 | ||
1763 | // Capture tag frame (manchester decoding using only falling edges) | |
1764 | if (ra >= HITAG_T_EOF) { | |
1765 | if (rxlen != 0) { | |
1766 | //DbpString("wierd1?"); | |
1767 | } | |
1768 | // Capture the T0 periods that have passed since last communication or field drop (reset) | |
1769 | // We always recieve a 'one' first, which has the falling edge after a half period |-_| | |
1770 | response = ra - HITAG_T_TAG_HALF_PERIOD; | |
1771 | } else if (ra >= HITAG_T_TAG_CAPTURE_FOUR_HALF) { | |
1772 | // Manchester coding example |-_|_-|-_| (101) | |
1773 | rx[rxlen / 8] |= 0 << (7 - (rxlen % 8)); | |
1774 | rxlen++; | |
1775 | rx[rxlen / 8] |= 1 << (7 - (rxlen % 8)); | |
1776 | rxlen++; | |
1777 | } else if (ra >= HITAG_T_TAG_CAPTURE_THREE_HALF) { | |
1778 | // Manchester coding example |_-|...|_-|-_| (0...01) | |
1779 | rx[rxlen / 8] |= 0 << (7 - (rxlen % 8)); | |
1780 | rxlen++; | |
1781 | // We have to skip this half period at start and add the 'one' the second time | |
1782 | if (!bSkip) { | |
1783 | rx[rxlen / 8] |= 1 << (7 - (rxlen % 8)); | |
1784 | rxlen++; | |
1785 | } | |
1786 | lastbit = !lastbit; | |
1787 | bSkip = !bSkip; | |
1788 | } else if (ra >= HITAG_T_TAG_CAPTURE_TWO_HALF) { | |
1789 | // Manchester coding example |_-|_-| (00) or |-_|-_| (11) | |
1790 | if (tag_sof) { | |
1791 | // Ignore bits that are transmitted during SOF | |
1792 | tag_sof--; | |
1793 | } else { | |
1794 | // bit is same as last bit | |
1795 | rx[rxlen / 8] |= lastbit << (7 - (rxlen % 8)); | |
1796 | rxlen++; | |
1797 | } | |
1798 | } else { | |
1799 | // Ignore wierd value, is to small to mean anything | |
1800 | } | |
1801 | } | |
1802 | ||
1803 | // We can break this loop if we received the last bit from a frame | |
1804 | if (AT91C_BASE_TC1->TC_CV > T0 * HITAG_T_EOF) { | |
1805 | if (rxlen > 0) | |
1806 | break; | |
1807 | } | |
1808 | } | |
1809 | } | |
1810 | end=false; | |
1811 | LED_B_OFF(); | |
1812 | LED_D_OFF(); | |
1813 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; | |
1814 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; | |
1815 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1816 | cmd_send(CMD_ACK, bSuccessful, 0, 0, 0, 0); | |
1817 | } | |
1818 | ||
1819 | /* | |
1820 | * Tries to authenticate to a Hitag S Transponder with the given challenges from a .cc file. | |
1821 | * Displays all Challenges that failed. | |
1822 | * When collecting Challenges to break the key it is possible that some data | |
1823 | * is not received correctly due to Antenna problems. This function | |
1824 | * detects these challenges. | |
1825 | */ | |
1826 | void check_challenges(bool file_given, byte_t* data) { | |
1827 | int i, j, z, k; | |
1828 | byte_t uid_byte[4]; | |
1829 | int frame_count; | |
1830 | int response; | |
1831 | byte_t rx[HITAG_FRAME_LEN]; | |
1832 | byte_t unlocker[60][8]; | |
1833 | int u1 = 0; | |
1834 | size_t rxlen = 0; | |
1835 | byte_t txbuf[HITAG_FRAME_LEN]; | |
1836 | byte_t* tx = txbuf; | |
1837 | size_t txlen = 0; | |
1838 | int lastbit; | |
1839 | bool bSkip; | |
1840 | int reset_sof; | |
1841 | int tag_sof; | |
1842 | int t_wait = HITAG_T_WAIT_MAX; | |
1843 | int STATE = 0; | |
1844 | bool bStop; | |
1845 | bool bQuitTraceFull = false; | |
1846 | int response_bit[200]; | |
1847 | unsigned char mask = 1; | |
1848 | unsigned char uid[32]; | |
1849 | unsigned char crc; | |
1850 | ||
1851 | FpgaDownloadAndGo(FPGA_BITSTREAM_LF); | |
1852 | // Reset the return status | |
1853 | bSuccessful = false; | |
1854 | ||
1855 | // Clean up trace and prepare it for storing frames | |
1856 | set_tracing(TRUE); | |
1857 | clear_trace(); | |
1858 | ||
1859 | bQuiet = false; | |
1860 | bQuitTraceFull = true; | |
1861 | ||
1862 | LED_D_ON(); | |
1863 | ||
1864 | // Configure output and enable pin that is connected to the FPGA (for modulating) | |
1865 | AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; | |
1866 | AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; | |
1867 | ||
1868 | // Set fpga in edge detect with reader field, we can modulate as reader now | |
1869 | FpgaWriteConfWord( | |
1870 | FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD); | |
1871 | ||
1872 | // Set Frequency divisor which will drive the FPGA and analog mux selection | |
1873 | FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz | |
1874 | SetAdcMuxFor(GPIO_MUXSEL_LOPKD); | |
1875 | RELAY_OFF(); | |
1876 | ||
1877 | // Disable modulation at default, which means enable the field | |
1878 | LOW(GPIO_SSC_DOUT); | |
1879 | ||
1880 | // Give it a bit of time for the resonant antenna to settle. | |
1881 | SpinDelay(30); | |
1882 | ||
1883 | // Enable Peripheral Clock for TIMER_CLOCK0, used to measure exact timing before answering | |
1884 | AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC0); | |
1885 | ||
1886 | // Enable Peripheral Clock for TIMER_CLOCK1, used to capture edges of the tag frames | |
1887 | AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1); | |
1888 | AT91C_BASE_PIOA->PIO_BSR = GPIO_SSC_FRAME; | |
1889 | ||
1890 | // Disable timer during configuration | |
1891 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; | |
1892 | ||
1893 | // Capture mode, defaul timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, | |
1894 | // external trigger rising edge, load RA on falling edge of TIOA. | |
1895 | AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK | |
1896 | ||
1897 | | AT91C_TC_ETRGEDG_FALLING | AT91C_TC_ABETRG | AT91C_TC_LDRA_FALLING; | |
1898 | ||
1899 | // Enable and reset counters | |
1900 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; | |
1901 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; | |
1902 | ||
1903 | // Reset the received frame, frame count and timing info | |
1904 | frame_count = 0; | |
1905 | response = 0; | |
1906 | lastbit = 1; | |
1907 | bStop = false; | |
1908 | ||
1909 | reset_sof = 1; | |
1910 | t_wait = 200; | |
1911 | ||
1912 | if (file_given) { | |
1913 | DbpString("Loading challenges..."); | |
1914 | memcpy((byte_t*)unlocker,data,60*8); | |
1915 | } | |
1916 | ||
1917 | while (file_given && !bStop && !BUTTON_PRESS()) { | |
1918 | // Watchdog hit | |
1919 | WDT_HIT(); | |
1920 | ||
1921 | // Check if frame was captured and store it | |
1922 | if (rxlen > 0) { | |
1923 | frame_count++; | |
1924 | if (!bQuiet) { | |
1925 | if (!LogTraceHitag(rx, rxlen, response, 0, false)) { | |
1926 | DbpString("Trace full"); | |
1927 | if (bQuitTraceFull) { | |
1928 | break; | |
1929 | } else { | |
1930 | bQuiet = true; | |
1931 | } | |
1932 | } | |
1933 | } | |
1934 | } | |
1935 | ||
1936 | tx = txbuf; | |
1937 | txlen = 0; | |
1938 | if (rxlen == 0) { | |
1939 | if (STATE == 2) | |
1940 | // challenge failed | |
1941 | Dbprintf("Challenge failed: %02X %02X %02X %02X %02X %02X %02X %02X", | |
1942 | unlocker[u1 - 1][0], unlocker[u1 - 1][1], | |
1943 | unlocker[u1 - 1][2], unlocker[u1 - 1][3], | |
1944 | unlocker[u1 - 1][4], unlocker[u1 - 1][5], | |
1945 | unlocker[u1 - 1][6], unlocker[u1 - 1][7]); | |
1946 | STATE = 0; | |
1947 | txlen = 5; | |
1948 | //start new authentication | |
1949 | memcpy(tx, "\xc0", nbytes(txlen)); | |
1950 | } else if (rxlen >= 67 && STATE == 0) { | |
1951 | //received uid | |
1952 | z = 0; | |
1953 | for (i = 0; i < 10; i++) { | |
1954 | for (j = 0; j < 8; j++) { | |
1955 | response_bit[z] = 0; | |
1956 | if ((rx[i] & ((mask << 7) >> j)) != 0) | |
1957 | response_bit[z] = 1; | |
1958 | z++; | |
1959 | } | |
1960 | } | |
1961 | k = 0; | |
1962 | for (i = 5; i < z; i += 2) { | |
1963 | uid[k] = response_bit[i]; | |
1964 | k++; | |
1965 | if (k > 31) | |
1966 | break; | |
1967 | } | |
1968 | uid_byte[0] = (uid[0] << 7) | (uid[1] << 6) | (uid[2] << 5) | |
1969 | | (uid[3] << 4) | (uid[4] << 3) | (uid[5] << 2) | |
1970 | | (uid[6] << 1) | uid[7]; | |
1971 | uid_byte[1] = (uid[8] << 7) | (uid[9] << 6) | (uid[10] << 5) | |
1972 | | (uid[11] << 4) | (uid[12] << 3) | (uid[13] << 2) | |
1973 | | (uid[14] << 1) | uid[15]; | |
1974 | uid_byte[2] = (uid[16] << 7) | (uid[17] << 6) | (uid[18] << 5) | |
1975 | | (uid[19] << 4) | (uid[20] << 3) | (uid[21] << 2) | |
1976 | | (uid[22] << 1) | uid[23]; | |
1977 | uid_byte[3] = (uid[24] << 7) | (uid[25] << 6) | (uid[26] << 5) | |
1978 | | (uid[27] << 4) | (uid[28] << 3) | (uid[29] << 2) | |
1979 | | (uid[30] << 1) | uid[31]; | |
1980 | //Dbhexdump(10, rx, rxlen); | |
1981 | STATE = 1; | |
1982 | txlen = 45; | |
1983 | crc = CRC_PRESET; | |
1984 | calc_crc(&crc, 0x00, 5); | |
1985 | calc_crc(&crc, uid_byte[0], 8); | |
1986 | calc_crc(&crc, uid_byte[1], 8); | |
1987 | calc_crc(&crc, uid_byte[2], 8); | |
1988 | calc_crc(&crc, uid_byte[3], 8); | |
1989 | for (i = 0; i < 100; i++) { | |
1990 | response_bit[i] = 0; | |
1991 | } | |
1992 | for (i = 0; i < 5; i++) { | |
1993 | response_bit[i] = 0; | |
1994 | } | |
1995 | for (i = 5; i < 37; i++) { | |
1996 | response_bit[i] = uid[i - 5]; | |
1997 | } | |
1998 | for (j = 0; j < 8; j++) { | |
1999 | response_bit[i] = 0; | |
2000 | if ((crc & ((mask << 7) >> j)) != 0) | |
2001 | response_bit[i] = 1; | |
2002 | i++; | |
2003 | } | |
2004 | k = 0; | |
2005 | for (i = 0; i < 6; i++) { | |
2006 | tx[i] = (response_bit[k] << 7) | (response_bit[k + 1] << 6) | |
2007 | | (response_bit[k + 2] << 5) | |
2008 | | (response_bit[k + 3] << 4) | |
2009 | | (response_bit[k + 4] << 3) | |
2010 | | (response_bit[k + 5] << 2) | |
2011 | | (response_bit[k + 6] << 1) | response_bit[k + 7]; | |
2012 | k += 8; | |
2013 | } | |
2014 | ||
2015 | } else if (STATE == 1 && rxlen == 44) { | |
2016 | //received configuration | |
2017 | STATE = 2; | |
2018 | z = 0; | |
2019 | for (i = 0; i < 6; i++) { | |
2020 | for (j = 0; j < 8; j++) { | |
2021 | response_bit[z] = 0; | |
2022 | if ((rx[i] & ((mask << 7) >> j)) != 0) | |
2023 | response_bit[z] = 1; | |
2024 | z++; | |
2025 | } | |
2026 | } | |
2027 | txlen = 64; | |
2028 | ||
2029 | if (u1 >= (sizeof(unlocker) / sizeof(unlocker[0]))) | |
2030 | bStop = !false; | |
2031 | for (i = 0; i < 8; i++) | |
2032 | tx[i] = unlocker[u1][i]; | |
2033 | u1++; | |
2034 | ||
2035 | } else if (STATE == 2 && rxlen >= 44) { | |
2036 | STATE = 0; | |
2037 | } | |
2038 | ||
2039 | // Send and store the reader command | |
2040 | // Disable timer 1 with external trigger to avoid triggers during our own modulation | |
2041 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; | |
2042 | ||
2043 | // Wait for HITAG_T_WAIT_2 carrier periods after the last tag bit before transmitting, | |
2044 | // Since the clock counts since the last falling edge, a 'one' means that the | |
2045 | // falling edge occured halfway the period. with respect to this falling edge, | |
2046 | // we need to wait (T_Wait2 + half_tag_period) when the last was a 'one'. | |
2047 | // All timer values are in terms of T0 units | |
2048 | ||
2049 | while (AT91C_BASE_TC0->TC_CV | |
2050 | < T0 * (t_wait + (HITAG_T_TAG_HALF_PERIOD * lastbit))) | |
2051 | ; | |
2052 | ||
2053 | // Transmit the reader frame | |
2054 | hitag_reader_send_frame(tx, txlen); | |
2055 | ||
2056 | // Enable and reset external trigger in timer for capturing future frames | |
2057 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; | |
2058 | ||
2059 | // Add transmitted frame to total count | |
2060 | if (txlen > 0) { | |
2061 | frame_count++; | |
2062 | if (!bQuiet) { | |
2063 | // Store the frame in the trace | |
2064 | if (!LogTraceHitag(tx, txlen, HITAG_T_WAIT_2, 0, true)) { | |
2065 | if (bQuitTraceFull) { | |
2066 | DbpString("Trace full"); | |
2067 | break; | |
2068 | } else { | |
2069 | bQuiet = true; | |
2070 | } | |
2071 | } | |
2072 | } | |
2073 | } | |
2074 | ||
2075 | // Reset values for receiving frames | |
2076 | memset(rx, 0x00, sizeof(rx)); | |
2077 | rxlen = 0; | |
2078 | lastbit = 1; | |
2079 | bSkip = true; | |
2080 | tag_sof = reset_sof; | |
2081 | response = 0; | |
2082 | ||
2083 | // Receive frame, watch for at most T0*EOF periods | |
2084 | while (AT91C_BASE_TC1->TC_CV < T0 * HITAG_T_WAIT_MAX) { | |
2085 | // Check if falling edge in tag modulation is detected | |
2086 | if (AT91C_BASE_TC1->TC_SR & AT91C_TC_LDRAS) { | |
2087 | // Retrieve the new timing values | |
2088 | int ra = (AT91C_BASE_TC1->TC_RA / T0); | |
2089 | ||
2090 | // Reset timer every frame, we have to capture the last edge for timing | |
2091 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; | |
2092 | ||
2093 | LED_B_ON(); | |
2094 | ||
2095 | // Capture tag frame (manchester decoding using only falling edges) | |
2096 | if (ra >= HITAG_T_EOF) { | |
2097 | if (rxlen != 0) { | |
2098 | //DbpString("wierd1?"); | |
2099 | } | |
2100 | // Capture the T0 periods that have passed since last communication or field drop (reset) | |
2101 | // We always recieve a 'one' first, which has the falling edge after a half period |-_| | |
2102 | response = ra - HITAG_T_TAG_HALF_PERIOD; | |
2103 | } else if (ra >= HITAG_T_TAG_CAPTURE_FOUR_HALF) { | |
2104 | // Manchester coding example |-_|_-|-_| (101) | |
2105 | rx[rxlen / 8] |= 0 << (7 - (rxlen % 8)); | |
2106 | rxlen++; | |
2107 | rx[rxlen / 8] |= 1 << (7 - (rxlen % 8)); | |
2108 | rxlen++; | |
2109 | } else if (ra >= HITAG_T_TAG_CAPTURE_THREE_HALF) { | |
2110 | // Manchester coding example |_-|...|_-|-_| (0...01) | |
2111 | rx[rxlen / 8] |= 0 << (7 - (rxlen % 8)); | |
2112 | rxlen++; | |
2113 | // We have to skip this half period at start and add the 'one' the second time | |
2114 | if (!bSkip) { | |
2115 | rx[rxlen / 8] |= 1 << (7 - (rxlen % 8)); | |
2116 | rxlen++; | |
2117 | } | |
2118 | lastbit = !lastbit; | |
2119 | bSkip = !bSkip; | |
2120 | } else if (ra >= HITAG_T_TAG_CAPTURE_TWO_HALF) { | |
2121 | // Manchester coding example |_-|_-| (00) or |-_|-_| (11) | |
2122 | if (tag_sof) { | |
2123 | // Ignore bits that are transmitted during SOF | |
2124 | tag_sof--; | |
2125 | } else { | |
2126 | // bit is same as last bit | |
2127 | rx[rxlen / 8] |= lastbit << (7 - (rxlen % 8)); | |
2128 | rxlen++; | |
2129 | } | |
2130 | } else { | |
2131 | // Ignore wierd value, is to small to mean anything | |
2132 | } | |
2133 | } | |
2134 | ||
2135 | // We can break this loop if we received the last bit from a frame | |
2136 | if (AT91C_BASE_TC1->TC_CV > T0 * HITAG_T_EOF) { | |
2137 | if (rxlen > 0) | |
2138 | break; | |
2139 | } | |
2140 | } | |
2141 | } | |
2142 | LED_B_OFF(); | |
2143 | LED_D_OFF(); | |
2144 | AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; | |
2145 | AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; | |
2146 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
2147 | cmd_send(CMD_ACK, bSuccessful, 0, 0, 0, 0); | |
2148 | } | |
2149 | ||
2150 | ||
2151 |