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15c4dc5a | 1 | //----------------------------------------------------------------------------- |
b62a5a84 | 2 | // Merlok - June 2011, 2012 |
15c4dc5a | 3 | // Gerhard de Koning Gans - May 2008 |
534983d7 | 4 | // Hagen Fritsch - June 2010 |
bd20f8f4 | 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. | |
15c4dc5a | 9 | //----------------------------------------------------------------------------- |
bd20f8f4 | 10 | // Routines to support ISO 14443 type A. |
11 | //----------------------------------------------------------------------------- | |
12 | ||
e30c654b | 13 | #include "proxmark3.h" |
15c4dc5a | 14 | #include "apps.h" |
f7e3ed82 | 15 | #include "util.h" |
9ab7a6c7 | 16 | #include "string.h" |
902cb3c0 | 17 | #include "cmd.h" |
9ab7a6c7 | 18 | |
15c4dc5a | 19 | #include "iso14443crc.h" |
534983d7 | 20 | #include "iso14443a.h" |
20f9a2a1 M |
21 | #include "crapto1.h" |
22 | #include "mifareutil.h" | |
15c4dc5a | 23 | |
534983d7 | 24 | static uint32_t iso14a_timeout; |
d19929cb | 25 | uint8_t *trace = (uint8_t *) BigBuf+TRACE_OFFSET; |
1e262141 | 26 | int rsamples = 0; |
7bc95e2e | 27 | int traceLen = 0; |
1e262141 | 28 | int tracing = TRUE; |
29 | uint8_t trigger = 0; | |
b0127e65 | 30 | // the block number for the ISO14443-4 PCB |
31 | static uint8_t iso14_pcb_blocknum = 0; | |
15c4dc5a | 32 | |
7bc95e2e | 33 | // |
34 | // ISO14443 timing: | |
35 | // | |
36 | // minimum time between the start bits of consecutive transfers from reader to tag: 7000 carrier (13.56Mhz) cycles | |
37 | #define REQUEST_GUARD_TIME (7000/16 + 1) | |
38 | // minimum time between last modulation of tag and next start bit from reader to tag: 1172 carrier cycles | |
39 | #define FRAME_DELAY_TIME_PICC_TO_PCD (1172/16 + 1) | |
40 | // bool LastCommandWasRequest = FALSE; | |
41 | ||
42 | // | |
43 | // Total delays including SSC-Transfers between ARM and FPGA. These are in carrier clock cycles (1/13,56MHz) | |
44 | // | |
d714d3ef | 45 | // When the PM acts as reader and is receiving tag data, it takes |
46 | // 3 ticks delay in the AD converter | |
47 | // 16 ticks until the modulation detector completes and sets curbit | |
48 | // 8 ticks until bit_to_arm is assigned from curbit | |
49 | // 8*16 ticks for the transfer from FPGA to ARM | |
7bc95e2e | 50 | // 4*16 ticks until we measure the time |
51 | // - 8*16 ticks because we measure the time of the previous transfer | |
d714d3ef | 52 | #define DELAY_AIR2ARM_AS_READER (3 + 16 + 8 + 8*16 + 4*16 - 8*16) |
7bc95e2e | 53 | |
54 | // When the PM acts as a reader and is sending, it takes | |
55 | // 4*16 ticks until we can write data to the sending hold register | |
56 | // 8*16 ticks until the SHR is transferred to the Sending Shift Register | |
57 | // 8 ticks until the first transfer starts | |
58 | // 8 ticks later the FPGA samples the data | |
59 | // 1 tick to assign mod_sig_coil | |
60 | #define DELAY_ARM2AIR_AS_READER (4*16 + 8*16 + 8 + 8 + 1) | |
61 | ||
62 | // When the PM acts as tag and is receiving it takes | |
d714d3ef | 63 | // 2 ticks delay in the RF part (for the first falling edge), |
7bc95e2e | 64 | // 3 ticks for the A/D conversion, |
65 | // 8 ticks on average until the start of the SSC transfer, | |
66 | // 8 ticks until the SSC samples the first data | |
67 | // 7*16 ticks to complete the transfer from FPGA to ARM | |
68 | // 8 ticks until the next ssp_clk rising edge | |
d714d3ef | 69 | // 4*16 ticks until we measure the time |
7bc95e2e | 70 | // - 8*16 ticks because we measure the time of the previous transfer |
d714d3ef | 71 | #define DELAY_AIR2ARM_AS_TAG (2 + 3 + 8 + 8 + 7*16 + 8 + 4*16 - 8*16) |
7bc95e2e | 72 | |
73 | // The FPGA will report its internal sending delay in | |
74 | uint16_t FpgaSendQueueDelay; | |
75 | // the 5 first bits are the number of bits buffered in mod_sig_buf | |
76 | // the last three bits are the remaining ticks/2 after the mod_sig_buf shift | |
77 | #define DELAY_FPGA_QUEUE (FpgaSendQueueDelay<<1) | |
78 | ||
79 | // When the PM acts as tag and is sending, it takes | |
d714d3ef | 80 | // 4*16 ticks until we can write data to the sending hold register |
7bc95e2e | 81 | // 8*16 ticks until the SHR is transferred to the Sending Shift Register |
82 | // 8 ticks until the first transfer starts | |
83 | // 8 ticks later the FPGA samples the data | |
84 | // + a varying number of ticks in the FPGA Delay Queue (mod_sig_buf) | |
85 | // + 1 tick to assign mod_sig_coil | |
d714d3ef | 86 | #define DELAY_ARM2AIR_AS_TAG (4*16 + 8*16 + 8 + 8 + DELAY_FPGA_QUEUE + 1) |
7bc95e2e | 87 | |
88 | // When the PM acts as sniffer and is receiving tag data, it takes | |
89 | // 3 ticks A/D conversion | |
d714d3ef | 90 | // 14 ticks to complete the modulation detection |
91 | // 8 ticks (on average) until the result is stored in to_arm | |
7bc95e2e | 92 | // + the delays in transferring data - which is the same for |
93 | // sniffing reader and tag data and therefore not relevant | |
d714d3ef | 94 | #define DELAY_TAG_AIR2ARM_AS_SNIFFER (3 + 14 + 8) |
7bc95e2e | 95 | |
d714d3ef | 96 | // When the PM acts as sniffer and is receiving reader data, it takes |
97 | // 2 ticks delay in analogue RF receiver (for the falling edge of the | |
98 | // start bit, which marks the start of the communication) | |
7bc95e2e | 99 | // 3 ticks A/D conversion |
d714d3ef | 100 | // 8 ticks on average until the data is stored in to_arm. |
7bc95e2e | 101 | // + the delays in transferring data - which is the same for |
102 | // sniffing reader and tag data and therefore not relevant | |
d714d3ef | 103 | #define DELAY_READER_AIR2ARM_AS_SNIFFER (2 + 3 + 8) |
7bc95e2e | 104 | |
105 | //variables used for timing purposes: | |
106 | //these are in ssp_clk cycles: | |
6a1f2d82 | 107 | static uint32_t NextTransferTime; |
108 | static uint32_t LastTimeProxToAirStart; | |
109 | static uint32_t LastProxToAirDuration; | |
7bc95e2e | 110 | |
111 | ||
112 | ||
8f51ddb0 | 113 | // CARD TO READER - manchester |
72934aa3 | 114 | // Sequence D: 11110000 modulation with subcarrier during first half |
115 | // Sequence E: 00001111 modulation with subcarrier during second half | |
116 | // Sequence F: 00000000 no modulation with subcarrier | |
8f51ddb0 | 117 | // READER TO CARD - miller |
72934aa3 | 118 | // Sequence X: 00001100 drop after half a period |
119 | // Sequence Y: 00000000 no drop | |
120 | // Sequence Z: 11000000 drop at start | |
121 | #define SEC_D 0xf0 | |
122 | #define SEC_E 0x0f | |
123 | #define SEC_F 0x00 | |
124 | #define SEC_X 0x0c | |
125 | #define SEC_Y 0x00 | |
126 | #define SEC_Z 0xc0 | |
15c4dc5a | 127 | |
1e262141 | 128 | const uint8_t OddByteParity[256] = { |
15c4dc5a | 129 | 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, |
130 | 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, | |
131 | 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, | |
132 | 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, | |
133 | 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, | |
134 | 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, | |
135 | 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, | |
136 | 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, | |
137 | 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, | |
138 | 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, | |
139 | 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, | |
140 | 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, | |
141 | 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, | |
142 | 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, | |
143 | 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, | |
144 | 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1 | |
145 | }; | |
146 | ||
902cb3c0 | 147 | void iso14a_set_trigger(bool enable) { |
534983d7 | 148 | trigger = enable; |
149 | } | |
150 | ||
d19929cb | 151 | |
b0127e65 | 152 | void iso14a_set_timeout(uint32_t timeout) { |
153 | iso14a_timeout = timeout; | |
154 | } | |
8556b852 | 155 | |
15c4dc5a | 156 | //----------------------------------------------------------------------------- |
157 | // Generate the parity value for a byte sequence | |
e30c654b | 158 | // |
15c4dc5a | 159 | //----------------------------------------------------------------------------- |
20f9a2a1 M |
160 | byte_t oddparity (const byte_t bt) |
161 | { | |
5f6d6c90 | 162 | return OddByteParity[bt]; |
20f9a2a1 M |
163 | } |
164 | ||
6a1f2d82 | 165 | void GetParity(const uint8_t *pbtCmd, uint16_t iLen, uint8_t *par) |
15c4dc5a | 166 | { |
6a1f2d82 | 167 | uint16_t paritybit_cnt = 0; |
168 | uint16_t paritybyte_cnt = 0; | |
169 | uint8_t parityBits = 0; | |
170 | ||
171 | for (uint16_t i = 0; i < iLen; i++) { | |
172 | // Generate the parity bits | |
173 | parityBits |= ((OddByteParity[pbtCmd[i]]) << (7-paritybit_cnt)); | |
174 | if (paritybit_cnt == 7) { | |
175 | par[paritybyte_cnt] = parityBits; // save 8 Bits parity | |
176 | parityBits = 0; // and advance to next Parity Byte | |
177 | paritybyte_cnt++; | |
178 | paritybit_cnt = 0; | |
179 | } else { | |
180 | paritybit_cnt++; | |
181 | } | |
5f6d6c90 | 182 | } |
6a1f2d82 | 183 | |
184 | // save remaining parity bits | |
185 | par[paritybyte_cnt] = parityBits; | |
186 | ||
15c4dc5a | 187 | } |
188 | ||
534983d7 | 189 | void AppendCrc14443a(uint8_t* data, int len) |
15c4dc5a | 190 | { |
5f6d6c90 | 191 | ComputeCrc14443(CRC_14443_A,data,len,data+len,data+len+1); |
15c4dc5a | 192 | } |
193 | ||
15c4dc5a | 194 | |
7bc95e2e | 195 | //============================================================================= |
196 | // ISO 14443 Type A - Miller decoder | |
197 | //============================================================================= | |
198 | // Basics: | |
199 | // This decoder is used when the PM3 acts as a tag. | |
200 | // The reader will generate "pauses" by temporarily switching of the field. | |
201 | // At the PM3 antenna we will therefore measure a modulated antenna voltage. | |
202 | // The FPGA does a comparison with a threshold and would deliver e.g.: | |
203 | // ........ 1 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 ....... | |
204 | // The Miller decoder needs to identify the following sequences: | |
205 | // 2 (or 3) ticks pause followed by 6 (or 5) ticks unmodulated: pause at beginning - Sequence Z ("start of communication" or a "0") | |
206 | // 8 ticks without a modulation: no pause - Sequence Y (a "0" or "end of communication" or "no information") | |
207 | // 4 ticks unmodulated followed by 2 (or 3) ticks pause: pause in second half - Sequence X (a "1") | |
208 | // Note 1: the bitstream may start at any time. We therefore need to sync. | |
209 | // Note 2: the interpretation of Sequence Y and Z depends on the preceding sequence. | |
15c4dc5a | 210 | //----------------------------------------------------------------------------- |
b62a5a84 | 211 | static tUart Uart; |
15c4dc5a | 212 | |
d7aa3739 | 213 | // Lookup-Table to decide if 4 raw bits are a modulation. |
214 | // We accept two or three consecutive "0" in any position with the rest "1" | |
215 | const bool Mod_Miller_LUT[] = { | |
216 | TRUE, TRUE, FALSE, TRUE, FALSE, FALSE, FALSE, FALSE, | |
217 | TRUE, TRUE, FALSE, FALSE, TRUE, FALSE, FALSE, FALSE | |
218 | }; | |
219 | #define IsMillerModulationNibble1(b) (Mod_Miller_LUT[(b & 0x00F0) >> 4]) | |
220 | #define IsMillerModulationNibble2(b) (Mod_Miller_LUT[(b & 0x000F)]) | |
221 | ||
7bc95e2e | 222 | void UartReset() |
15c4dc5a | 223 | { |
7bc95e2e | 224 | Uart.state = STATE_UNSYNCD; |
225 | Uart.bitCount = 0; | |
226 | Uart.len = 0; // number of decoded data bytes | |
6a1f2d82 | 227 | Uart.parityLen = 0; // number of decoded parity bytes |
7bc95e2e | 228 | Uart.shiftReg = 0; // shiftreg to hold decoded data bits |
6a1f2d82 | 229 | Uart.parityBits = 0; // holds 8 parity bits |
7bc95e2e | 230 | Uart.twoBits = 0x0000; // buffer for 2 Bits |
231 | Uart.highCnt = 0; | |
232 | Uart.startTime = 0; | |
233 | Uart.endTime = 0; | |
234 | } | |
15c4dc5a | 235 | |
6a1f2d82 | 236 | void UartInit(uint8_t *data, uint8_t *parity) |
237 | { | |
238 | Uart.output = data; | |
239 | Uart.parity = parity; | |
240 | UartReset(); | |
241 | } | |
d714d3ef | 242 | |
7bc95e2e | 243 | // use parameter non_real_time to provide a timestamp. Set to 0 if the decoder should measure real time |
244 | static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) | |
245 | { | |
15c4dc5a | 246 | |
7bc95e2e | 247 | Uart.twoBits = (Uart.twoBits << 8) | bit; |
248 | ||
249 | if (Uart.state == STATE_UNSYNCD) { // not yet synced | |
3fe4ff4f | 250 | |
7bc95e2e | 251 | if (Uart.highCnt < 7) { // wait for a stable unmodulated signal |
252 | if (Uart.twoBits == 0xffff) { | |
253 | Uart.highCnt++; | |
254 | } else { | |
255 | Uart.highCnt = 0; | |
15c4dc5a | 256 | } |
7bc95e2e | 257 | } else { |
258 | Uart.syncBit = 0xFFFF; // not set | |
259 | // look for 00xx1111 (the start bit) | |
260 | if ((Uart.twoBits & 0x6780) == 0x0780) Uart.syncBit = 7; | |
261 | else if ((Uart.twoBits & 0x33C0) == 0x03C0) Uart.syncBit = 6; | |
262 | else if ((Uart.twoBits & 0x19E0) == 0x01E0) Uart.syncBit = 5; | |
263 | else if ((Uart.twoBits & 0x0CF0) == 0x00F0) Uart.syncBit = 4; | |
264 | else if ((Uart.twoBits & 0x0678) == 0x0078) Uart.syncBit = 3; | |
265 | else if ((Uart.twoBits & 0x033C) == 0x003C) Uart.syncBit = 2; | |
266 | else if ((Uart.twoBits & 0x019E) == 0x001E) Uart.syncBit = 1; | |
267 | else if ((Uart.twoBits & 0x00CF) == 0x000F) Uart.syncBit = 0; | |
268 | if (Uart.syncBit != 0xFFFF) { | |
269 | Uart.startTime = non_real_time?non_real_time:(GetCountSspClk() & 0xfffffff8); | |
270 | Uart.startTime -= Uart.syncBit; | |
d7aa3739 | 271 | Uart.endTime = Uart.startTime; |
7bc95e2e | 272 | Uart.state = STATE_START_OF_COMMUNICATION; |
15c4dc5a | 273 | } |
7bc95e2e | 274 | } |
15c4dc5a | 275 | |
7bc95e2e | 276 | } else { |
15c4dc5a | 277 | |
d7aa3739 | 278 | if (IsMillerModulationNibble1(Uart.twoBits >> Uart.syncBit)) { |
279 | if (IsMillerModulationNibble2(Uart.twoBits >> Uart.syncBit)) { // Modulation in both halves - error | |
280 | UartReset(); | |
281 | Uart.highCnt = 6; | |
282 | } else { // Modulation in first half = Sequence Z = logic "0" | |
7bc95e2e | 283 | if (Uart.state == STATE_MILLER_X) { // error - must not follow after X |
284 | UartReset(); | |
285 | Uart.highCnt = 6; | |
286 | } else { | |
287 | Uart.bitCount++; | |
288 | Uart.shiftReg = (Uart.shiftReg >> 1); // add a 0 to the shiftreg | |
289 | Uart.state = STATE_MILLER_Z; | |
290 | Uart.endTime = Uart.startTime + 8*(9*Uart.len + Uart.bitCount + 1) - 6; | |
291 | if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity) | |
292 | Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); | |
293 | Uart.parityBits <<= 1; // make room for the parity bit | |
294 | Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit | |
295 | Uart.bitCount = 0; | |
296 | Uart.shiftReg = 0; | |
6a1f2d82 | 297 | if((Uart.len&0x0007) == 0) { // every 8 data bytes |
298 | Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits | |
299 | Uart.parityBits = 0; | |
300 | } | |
15c4dc5a | 301 | } |
7bc95e2e | 302 | } |
d7aa3739 | 303 | } |
304 | } else { | |
305 | if (IsMillerModulationNibble2(Uart.twoBits >> Uart.syncBit)) { // Modulation second half = Sequence X = logic "1" | |
7bc95e2e | 306 | Uart.bitCount++; |
307 | Uart.shiftReg = (Uart.shiftReg >> 1) | 0x100; // add a 1 to the shiftreg | |
308 | Uart.state = STATE_MILLER_X; | |
309 | Uart.endTime = Uart.startTime + 8*(9*Uart.len + Uart.bitCount + 1) - 2; | |
310 | if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity) | |
311 | Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); | |
312 | Uart.parityBits <<= 1; // make room for the new parity bit | |
313 | Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit | |
314 | Uart.bitCount = 0; | |
315 | Uart.shiftReg = 0; | |
6a1f2d82 | 316 | if ((Uart.len&0x0007) == 0) { // every 8 data bytes |
317 | Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits | |
318 | Uart.parityBits = 0; | |
319 | } | |
7bc95e2e | 320 | } |
d7aa3739 | 321 | } else { // no modulation in both halves - Sequence Y |
7bc95e2e | 322 | if (Uart.state == STATE_MILLER_Z || Uart.state == STATE_MILLER_Y) { // Y after logic "0" - End of Communication |
15c4dc5a | 323 | Uart.state = STATE_UNSYNCD; |
6a1f2d82 | 324 | Uart.bitCount--; // last "0" was part of EOC sequence |
325 | Uart.shiftReg <<= 1; // drop it | |
326 | if(Uart.bitCount > 0) { // if we decoded some bits | |
327 | Uart.shiftReg >>= (9 - Uart.bitCount); // right align them | |
328 | Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); // add last byte to the output | |
329 | Uart.parityBits <<= 1; // add a (void) parity bit | |
330 | Uart.parityBits <<= (8 - (Uart.len&0x0007)); // left align parity bits | |
331 | Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store it | |
332 | return TRUE; | |
333 | } else if (Uart.len & 0x0007) { // there are some parity bits to store | |
334 | Uart.parityBits <<= (8 - (Uart.len&0x0007)); // left align remaining parity bits | |
335 | Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store them | |
52bfb955 | 336 | } |
337 | if (Uart.len) { | |
6a1f2d82 | 338 | return TRUE; // we are finished with decoding the raw data sequence |
52bfb955 | 339 | } else { |
3fe4ff4f | 340 | UartReset(); // Nothing receiver - start over |
7bc95e2e | 341 | } |
15c4dc5a | 342 | } |
7bc95e2e | 343 | if (Uart.state == STATE_START_OF_COMMUNICATION) { // error - must not follow directly after SOC |
344 | UartReset(); | |
345 | Uart.highCnt = 6; | |
346 | } else { // a logic "0" | |
347 | Uart.bitCount++; | |
348 | Uart.shiftReg = (Uart.shiftReg >> 1); // add a 0 to the shiftreg | |
349 | Uart.state = STATE_MILLER_Y; | |
350 | if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity) | |
351 | Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); | |
352 | Uart.parityBits <<= 1; // make room for the parity bit | |
353 | Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit | |
354 | Uart.bitCount = 0; | |
355 | Uart.shiftReg = 0; | |
6a1f2d82 | 356 | if ((Uart.len&0x0007) == 0) { // every 8 data bytes |
357 | Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits | |
358 | Uart.parityBits = 0; | |
359 | } | |
15c4dc5a | 360 | } |
361 | } | |
d7aa3739 | 362 | } |
15c4dc5a | 363 | } |
7bc95e2e | 364 | |
365 | } | |
15c4dc5a | 366 | |
7bc95e2e | 367 | return FALSE; // not finished yet, need more data |
15c4dc5a | 368 | } |
369 | ||
7bc95e2e | 370 | |
371 | ||
15c4dc5a | 372 | //============================================================================= |
e691fc45 | 373 | // ISO 14443 Type A - Manchester decoder |
15c4dc5a | 374 | //============================================================================= |
e691fc45 | 375 | // Basics: |
7bc95e2e | 376 | // This decoder is used when the PM3 acts as a reader. |
e691fc45 | 377 | // The tag will modulate the reader field by asserting different loads to it. As a consequence, the voltage |
378 | // at the reader antenna will be modulated as well. The FPGA detects the modulation for us and would deliver e.g. the following: | |
379 | // ........ 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ....... | |
380 | // The Manchester decoder needs to identify the following sequences: | |
381 | // 4 ticks modulated followed by 4 ticks unmodulated: Sequence D = 1 (also used as "start of communication") | |
382 | // 4 ticks unmodulated followed by 4 ticks modulated: Sequence E = 0 | |
383 | // 8 ticks unmodulated: Sequence F = end of communication | |
384 | // 8 ticks modulated: A collision. Save the collision position and treat as Sequence D | |
7bc95e2e | 385 | // Note 1: the bitstream may start at any time. We therefore need to sync. |
e691fc45 | 386 | // Note 2: parameter offset is used to determine the position of the parity bits (required for the anticollision command only) |
b62a5a84 | 387 | static tDemod Demod; |
15c4dc5a | 388 | |
d7aa3739 | 389 | // Lookup-Table to decide if 4 raw bits are a modulation. |
d714d3ef | 390 | // We accept three or four "1" in any position |
7bc95e2e | 391 | const bool Mod_Manchester_LUT[] = { |
d7aa3739 | 392 | FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, TRUE, |
d714d3ef | 393 | FALSE, FALSE, FALSE, TRUE, FALSE, TRUE, TRUE, TRUE |
7bc95e2e | 394 | }; |
395 | ||
396 | #define IsManchesterModulationNibble1(b) (Mod_Manchester_LUT[(b & 0x00F0) >> 4]) | |
397 | #define IsManchesterModulationNibble2(b) (Mod_Manchester_LUT[(b & 0x000F)]) | |
15c4dc5a | 398 | |
2f2d9fc5 | 399 | |
7bc95e2e | 400 | void DemodReset() |
e691fc45 | 401 | { |
7bc95e2e | 402 | Demod.state = DEMOD_UNSYNCD; |
403 | Demod.len = 0; // number of decoded data bytes | |
6a1f2d82 | 404 | Demod.parityLen = 0; |
7bc95e2e | 405 | Demod.shiftReg = 0; // shiftreg to hold decoded data bits |
406 | Demod.parityBits = 0; // | |
407 | Demod.collisionPos = 0; // Position of collision bit | |
408 | Demod.twoBits = 0xffff; // buffer for 2 Bits | |
409 | Demod.highCnt = 0; | |
410 | Demod.startTime = 0; | |
411 | Demod.endTime = 0; | |
e691fc45 | 412 | } |
15c4dc5a | 413 | |
6a1f2d82 | 414 | void DemodInit(uint8_t *data, uint8_t *parity) |
415 | { | |
416 | Demod.output = data; | |
417 | Demod.parity = parity; | |
418 | DemodReset(); | |
419 | } | |
420 | ||
7bc95e2e | 421 | // use parameter non_real_time to provide a timestamp. Set to 0 if the decoder should measure real time |
422 | static RAMFUNC int ManchesterDecoding(uint8_t bit, uint16_t offset, uint32_t non_real_time) | |
e691fc45 | 423 | { |
7bc95e2e | 424 | |
425 | Demod.twoBits = (Demod.twoBits << 8) | bit; | |
e691fc45 | 426 | |
7bc95e2e | 427 | if (Demod.state == DEMOD_UNSYNCD) { |
428 | ||
429 | if (Demod.highCnt < 2) { // wait for a stable unmodulated signal | |
430 | if (Demod.twoBits == 0x0000) { | |
431 | Demod.highCnt++; | |
432 | } else { | |
433 | Demod.highCnt = 0; | |
434 | } | |
435 | } else { | |
436 | Demod.syncBit = 0xFFFF; // not set | |
437 | if ((Demod.twoBits & 0x7700) == 0x7000) Demod.syncBit = 7; | |
438 | else if ((Demod.twoBits & 0x3B80) == 0x3800) Demod.syncBit = 6; | |
439 | else if ((Demod.twoBits & 0x1DC0) == 0x1C00) Demod.syncBit = 5; | |
440 | else if ((Demod.twoBits & 0x0EE0) == 0x0E00) Demod.syncBit = 4; | |
441 | else if ((Demod.twoBits & 0x0770) == 0x0700) Demod.syncBit = 3; | |
442 | else if ((Demod.twoBits & 0x03B8) == 0x0380) Demod.syncBit = 2; | |
443 | else if ((Demod.twoBits & 0x01DC) == 0x01C0) Demod.syncBit = 1; | |
444 | else if ((Demod.twoBits & 0x00EE) == 0x00E0) Demod.syncBit = 0; | |
d7aa3739 | 445 | if (Demod.syncBit != 0xFFFF) { |
7bc95e2e | 446 | Demod.startTime = non_real_time?non_real_time:(GetCountSspClk() & 0xfffffff8); |
447 | Demod.startTime -= Demod.syncBit; | |
448 | Demod.bitCount = offset; // number of decoded data bits | |
e691fc45 | 449 | Demod.state = DEMOD_MANCHESTER_DATA; |
2f2d9fc5 | 450 | } |
7bc95e2e | 451 | } |
15c4dc5a | 452 | |
7bc95e2e | 453 | } else { |
15c4dc5a | 454 | |
7bc95e2e | 455 | if (IsManchesterModulationNibble1(Demod.twoBits >> Demod.syncBit)) { // modulation in first half |
456 | if (IsManchesterModulationNibble2(Demod.twoBits >> Demod.syncBit)) { // ... and in second half = collision | |
e691fc45 | 457 | if (!Demod.collisionPos) { |
458 | Demod.collisionPos = (Demod.len << 3) + Demod.bitCount; | |
459 | } | |
460 | } // modulation in first half only - Sequence D = 1 | |
7bc95e2e | 461 | Demod.bitCount++; |
462 | Demod.shiftReg = (Demod.shiftReg >> 1) | 0x100; // in both cases, add a 1 to the shiftreg | |
463 | if(Demod.bitCount == 9) { // if we decoded a full byte (including parity) | |
e691fc45 | 464 | Demod.output[Demod.len++] = (Demod.shiftReg & 0xff); |
7bc95e2e | 465 | Demod.parityBits <<= 1; // make room for the parity bit |
e691fc45 | 466 | Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit |
467 | Demod.bitCount = 0; | |
468 | Demod.shiftReg = 0; | |
6a1f2d82 | 469 | if((Demod.len&0x0007) == 0) { // every 8 data bytes |
470 | Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits | |
471 | Demod.parityBits = 0; | |
472 | } | |
15c4dc5a | 473 | } |
7bc95e2e | 474 | Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1) - 4; |
475 | } else { // no modulation in first half | |
476 | if (IsManchesterModulationNibble2(Demod.twoBits >> Demod.syncBit)) { // and modulation in second half = Sequence E = 0 | |
e691fc45 | 477 | Demod.bitCount++; |
7bc95e2e | 478 | Demod.shiftReg = (Demod.shiftReg >> 1); // add a 0 to the shiftreg |
e691fc45 | 479 | if(Demod.bitCount >= 9) { // if we decoded a full byte (including parity) |
e691fc45 | 480 | Demod.output[Demod.len++] = (Demod.shiftReg & 0xff); |
7bc95e2e | 481 | Demod.parityBits <<= 1; // make room for the new parity bit |
e691fc45 | 482 | Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit |
483 | Demod.bitCount = 0; | |
484 | Demod.shiftReg = 0; | |
6a1f2d82 | 485 | if ((Demod.len&0x0007) == 0) { // every 8 data bytes |
486 | Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits1 | |
487 | Demod.parityBits = 0; | |
488 | } | |
15c4dc5a | 489 | } |
7bc95e2e | 490 | Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1); |
e691fc45 | 491 | } else { // no modulation in both halves - End of communication |
6a1f2d82 | 492 | if(Demod.bitCount > 0) { // there are some remaining data bits |
493 | Demod.shiftReg >>= (9 - Demod.bitCount); // right align the decoded bits | |
494 | Demod.output[Demod.len++] = Demod.shiftReg & 0xff; // and add them to the output | |
495 | Demod.parityBits <<= 1; // add a (void) parity bit | |
496 | Demod.parityBits <<= (8 - (Demod.len&0x0007)); // left align remaining parity bits | |
497 | Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them | |
498 | return TRUE; | |
499 | } else if (Demod.len & 0x0007) { // there are some parity bits to store | |
500 | Demod.parityBits <<= (8 - (Demod.len&0x0007)); // left align remaining parity bits | |
501 | Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them | |
52bfb955 | 502 | } |
503 | if (Demod.len) { | |
d7aa3739 | 504 | return TRUE; // we are finished with decoding the raw data sequence |
505 | } else { // nothing received. Start over | |
506 | DemodReset(); | |
e691fc45 | 507 | } |
15c4dc5a | 508 | } |
7bc95e2e | 509 | } |
e691fc45 | 510 | |
511 | } | |
15c4dc5a | 512 | |
e691fc45 | 513 | return FALSE; // not finished yet, need more data |
15c4dc5a | 514 | } |
515 | ||
516 | //============================================================================= | |
517 | // Finally, a `sniffer' for ISO 14443 Type A | |
518 | // Both sides of communication! | |
519 | //============================================================================= | |
520 | ||
521 | //----------------------------------------------------------------------------- | |
522 | // Record the sequence of commands sent by the reader to the tag, with | |
523 | // triggering so that we start recording at the point that the tag is moved | |
524 | // near the reader. | |
525 | //----------------------------------------------------------------------------- | |
5cd9ec01 M |
526 | void RAMFUNC SnoopIso14443a(uint8_t param) { |
527 | // param: | |
528 | // bit 0 - trigger from first card answer | |
529 | // bit 1 - trigger from first reader 7-bit request | |
530 | ||
531 | LEDsoff(); | |
532 | // init trace buffer | |
5f6d6c90 | 533 | iso14a_clear_trace(); |
991f13f2 | 534 | iso14a_set_tracing(TRUE); |
5cd9ec01 M |
535 | |
536 | // We won't start recording the frames that we acquire until we trigger; | |
537 | // a good trigger condition to get started is probably when we see a | |
538 | // response from the tag. | |
539 | // triggered == FALSE -- to wait first for card | |
7bc95e2e | 540 | bool triggered = !(param & 0x03); |
541 | ||
5cd9ec01 | 542 | // The command (reader -> tag) that we're receiving. |
15c4dc5a | 543 | // The length of a received command will in most cases be no more than 18 bytes. |
544 | // So 32 should be enough! | |
6a1f2d82 | 545 | uint8_t *receivedCmd = ((uint8_t *)BigBuf) + RECV_CMD_OFFSET; |
546 | uint8_t *receivedCmdPar = ((uint8_t *)BigBuf) + RECV_CMD_PAR_OFFSET; | |
547 | ||
5cd9ec01 | 548 | // The response (tag -> reader) that we're receiving. |
6a1f2d82 | 549 | uint8_t *receivedResponse = ((uint8_t *)BigBuf) + RECV_RESP_OFFSET; |
550 | uint8_t *receivedResponsePar = ((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET; | |
551 | ||
5cd9ec01 M |
552 | // As we receive stuff, we copy it from receivedCmd or receivedResponse |
553 | // into trace, along with its length and other annotations. | |
554 | //uint8_t *trace = (uint8_t *)BigBuf; | |
555 | ||
556 | // The DMA buffer, used to stream samples from the FPGA | |
7bc95e2e | 557 | uint8_t *dmaBuf = ((uint8_t *)BigBuf) + DMA_BUFFER_OFFSET; |
558 | uint8_t *data = dmaBuf; | |
559 | uint8_t previous_data = 0; | |
5cd9ec01 M |
560 | int maxDataLen = 0; |
561 | int dataLen = 0; | |
7bc95e2e | 562 | bool TagIsActive = FALSE; |
563 | bool ReaderIsActive = FALSE; | |
564 | ||
565 | iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER); | |
15c4dc5a | 566 | |
5cd9ec01 | 567 | // Set up the demodulator for tag -> reader responses. |
6a1f2d82 | 568 | DemodInit(receivedResponse, receivedResponsePar); |
569 | ||
5cd9ec01 | 570 | // Set up the demodulator for the reader -> tag commands |
6a1f2d82 | 571 | UartInit(receivedCmd, receivedCmdPar); |
572 | ||
7bc95e2e | 573 | // Setup and start DMA. |
5cd9ec01 | 574 | FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); |
7bc95e2e | 575 | |
5cd9ec01 | 576 | // And now we loop, receiving samples. |
7bc95e2e | 577 | for(uint32_t rsamples = 0; TRUE; ) { |
578 | ||
5cd9ec01 M |
579 | if(BUTTON_PRESS()) { |
580 | DbpString("cancelled by button"); | |
7bc95e2e | 581 | break; |
5cd9ec01 | 582 | } |
15c4dc5a | 583 | |
5cd9ec01 M |
584 | LED_A_ON(); |
585 | WDT_HIT(); | |
15c4dc5a | 586 | |
5cd9ec01 M |
587 | int register readBufDataP = data - dmaBuf; |
588 | int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR; | |
589 | if (readBufDataP <= dmaBufDataP){ | |
590 | dataLen = dmaBufDataP - readBufDataP; | |
591 | } else { | |
7bc95e2e | 592 | dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP; |
5cd9ec01 M |
593 | } |
594 | // test for length of buffer | |
595 | if(dataLen > maxDataLen) { | |
596 | maxDataLen = dataLen; | |
597 | if(dataLen > 400) { | |
7bc95e2e | 598 | Dbprintf("blew circular buffer! dataLen=%d", dataLen); |
599 | break; | |
5cd9ec01 M |
600 | } |
601 | } | |
602 | if(dataLen < 1) continue; | |
603 | ||
604 | // primary buffer was stopped( <-- we lost data! | |
605 | if (!AT91C_BASE_PDC_SSC->PDC_RCR) { | |
606 | AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf; | |
607 | AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE; | |
7bc95e2e | 608 | Dbprintf("RxEmpty ERROR!!! data length:%d", dataLen); // temporary |
5cd9ec01 M |
609 | } |
610 | // secondary buffer sets as primary, secondary buffer was stopped | |
611 | if (!AT91C_BASE_PDC_SSC->PDC_RNCR) { | |
612 | AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; | |
613 | AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE; | |
614 | } | |
615 | ||
616 | LED_A_OFF(); | |
7bc95e2e | 617 | |
618 | if (rsamples & 0x01) { // Need two samples to feed Miller and Manchester-Decoder | |
3be2a5ae | 619 | |
7bc95e2e | 620 | if(!TagIsActive) { // no need to try decoding reader data if the tag is sending |
621 | uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4); | |
622 | if (MillerDecoding(readerdata, (rsamples-1)*4)) { | |
623 | LED_C_ON(); | |
5cd9ec01 | 624 | |
7bc95e2e | 625 | // check - if there is a short 7bit request from reader |
626 | if ((!triggered) && (param & 0x02) && (Uart.len == 1) && (Uart.bitCount == 7)) triggered = TRUE; | |
5cd9ec01 | 627 | |
7bc95e2e | 628 | if(triggered) { |
6a1f2d82 | 629 | if (!LogTrace(receivedCmd, |
630 | Uart.len, | |
631 | Uart.startTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, | |
632 | Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, | |
633 | Uart.parity, | |
634 | TRUE)) break; | |
7bc95e2e | 635 | } |
636 | /* And ready to receive another command. */ | |
637 | UartReset(); | |
638 | /* And also reset the demod code, which might have been */ | |
639 | /* false-triggered by the commands from the reader. */ | |
640 | DemodReset(); | |
641 | LED_B_OFF(); | |
642 | } | |
643 | ReaderIsActive = (Uart.state != STATE_UNSYNCD); | |
5cd9ec01 | 644 | } |
3be2a5ae | 645 | |
7bc95e2e | 646 | if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time |
647 | uint8_t tagdata = (previous_data << 4) | (*data & 0x0F); | |
648 | if(ManchesterDecoding(tagdata, 0, (rsamples-1)*4)) { | |
649 | LED_B_ON(); | |
5cd9ec01 | 650 | |
6a1f2d82 | 651 | if (!LogTrace(receivedResponse, |
652 | Demod.len, | |
653 | Demod.startTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER, | |
654 | Demod.endTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER, | |
655 | Demod.parity, | |
656 | FALSE)) break; | |
5cd9ec01 | 657 | |
7bc95e2e | 658 | if ((!triggered) && (param & 0x01)) triggered = TRUE; |
5cd9ec01 | 659 | |
7bc95e2e | 660 | // And ready to receive another response. |
661 | DemodReset(); | |
662 | LED_C_OFF(); | |
663 | } | |
664 | TagIsActive = (Demod.state != DEMOD_UNSYNCD); | |
665 | } | |
5cd9ec01 M |
666 | } |
667 | ||
7bc95e2e | 668 | previous_data = *data; |
669 | rsamples++; | |
5cd9ec01 | 670 | data++; |
d714d3ef | 671 | if(data == dmaBuf + DMA_BUFFER_SIZE) { |
5cd9ec01 M |
672 | data = dmaBuf; |
673 | } | |
674 | } // main cycle | |
675 | ||
676 | DbpString("COMMAND FINISHED"); | |
15c4dc5a | 677 | |
7bc95e2e | 678 | FpgaDisableSscDma(); |
679 | Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len); | |
680 | Dbprintf("traceLen=%d, Uart.output[0]=%08x", traceLen, (uint32_t)Uart.output[0]); | |
5cd9ec01 | 681 | LEDsoff(); |
15c4dc5a | 682 | } |
683 | ||
15c4dc5a | 684 | //----------------------------------------------------------------------------- |
685 | // Prepare tag messages | |
686 | //----------------------------------------------------------------------------- | |
6a1f2d82 | 687 | static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *parity) |
15c4dc5a | 688 | { |
8f51ddb0 | 689 | ToSendReset(); |
15c4dc5a | 690 | |
691 | // Correction bit, might be removed when not needed | |
692 | ToSendStuffBit(0); | |
693 | ToSendStuffBit(0); | |
694 | ToSendStuffBit(0); | |
695 | ToSendStuffBit(0); | |
696 | ToSendStuffBit(1); // 1 | |
697 | ToSendStuffBit(0); | |
698 | ToSendStuffBit(0); | |
699 | ToSendStuffBit(0); | |
8f51ddb0 | 700 | |
15c4dc5a | 701 | // Send startbit |
72934aa3 | 702 | ToSend[++ToSendMax] = SEC_D; |
7bc95e2e | 703 | LastProxToAirDuration = 8 * ToSendMax - 4; |
15c4dc5a | 704 | |
6a1f2d82 | 705 | for(uint16_t i = 0; i < len; i++) { |
8f51ddb0 | 706 | uint8_t b = cmd[i]; |
15c4dc5a | 707 | |
708 | // Data bits | |
6a1f2d82 | 709 | for(uint16_t j = 0; j < 8; j++) { |
15c4dc5a | 710 | if(b & 1) { |
72934aa3 | 711 | ToSend[++ToSendMax] = SEC_D; |
15c4dc5a | 712 | } else { |
72934aa3 | 713 | ToSend[++ToSendMax] = SEC_E; |
8f51ddb0 M |
714 | } |
715 | b >>= 1; | |
716 | } | |
15c4dc5a | 717 | |
0014cb46 | 718 | // Get the parity bit |
6a1f2d82 | 719 | if (parity[i>>3] & (0x80>>(i&0x0007))) { |
8f51ddb0 | 720 | ToSend[++ToSendMax] = SEC_D; |
7bc95e2e | 721 | LastProxToAirDuration = 8 * ToSendMax - 4; |
15c4dc5a | 722 | } else { |
72934aa3 | 723 | ToSend[++ToSendMax] = SEC_E; |
7bc95e2e | 724 | LastProxToAirDuration = 8 * ToSendMax; |
15c4dc5a | 725 | } |
8f51ddb0 | 726 | } |
15c4dc5a | 727 | |
8f51ddb0 M |
728 | // Send stopbit |
729 | ToSend[++ToSendMax] = SEC_F; | |
15c4dc5a | 730 | |
8f51ddb0 M |
731 | // Convert from last byte pos to length |
732 | ToSendMax++; | |
8f51ddb0 M |
733 | } |
734 | ||
6a1f2d82 | 735 | static void CodeIso14443aAsTag(const uint8_t *cmd, uint16_t len) |
736 | { | |
737 | uint8_t par[MAX_PARITY_SIZE]; | |
738 | ||
739 | GetParity(cmd, len, par); | |
740 | CodeIso14443aAsTagPar(cmd, len, par); | |
15c4dc5a | 741 | } |
742 | ||
15c4dc5a | 743 | |
8f51ddb0 M |
744 | static void Code4bitAnswerAsTag(uint8_t cmd) |
745 | { | |
746 | int i; | |
747 | ||
5f6d6c90 | 748 | ToSendReset(); |
8f51ddb0 M |
749 | |
750 | // Correction bit, might be removed when not needed | |
751 | ToSendStuffBit(0); | |
752 | ToSendStuffBit(0); | |
753 | ToSendStuffBit(0); | |
754 | ToSendStuffBit(0); | |
755 | ToSendStuffBit(1); // 1 | |
756 | ToSendStuffBit(0); | |
757 | ToSendStuffBit(0); | |
758 | ToSendStuffBit(0); | |
759 | ||
760 | // Send startbit | |
761 | ToSend[++ToSendMax] = SEC_D; | |
762 | ||
763 | uint8_t b = cmd; | |
764 | for(i = 0; i < 4; i++) { | |
765 | if(b & 1) { | |
766 | ToSend[++ToSendMax] = SEC_D; | |
7bc95e2e | 767 | LastProxToAirDuration = 8 * ToSendMax - 4; |
8f51ddb0 M |
768 | } else { |
769 | ToSend[++ToSendMax] = SEC_E; | |
7bc95e2e | 770 | LastProxToAirDuration = 8 * ToSendMax; |
8f51ddb0 M |
771 | } |
772 | b >>= 1; | |
773 | } | |
774 | ||
775 | // Send stopbit | |
776 | ToSend[++ToSendMax] = SEC_F; | |
777 | ||
5f6d6c90 | 778 | // Convert from last byte pos to length |
779 | ToSendMax++; | |
15c4dc5a | 780 | } |
781 | ||
782 | //----------------------------------------------------------------------------- | |
783 | // Wait for commands from reader | |
784 | // Stop when button is pressed | |
785 | // Or return TRUE when command is captured | |
786 | //----------------------------------------------------------------------------- | |
6a1f2d82 | 787 | static int GetIso14443aCommandFromReader(uint8_t *received, uint8_t *parity, int *len) |
15c4dc5a | 788 | { |
789 | // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen | |
790 | // only, since we are receiving, not transmitting). | |
791 | // Signal field is off with the appropriate LED | |
792 | LED_D_OFF(); | |
793 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN); | |
794 | ||
795 | // Now run a `software UART' on the stream of incoming samples. | |
6a1f2d82 | 796 | UartInit(received, parity); |
7bc95e2e | 797 | |
798 | // clear RXRDY: | |
799 | uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; | |
15c4dc5a | 800 | |
801 | for(;;) { | |
802 | WDT_HIT(); | |
803 | ||
804 | if(BUTTON_PRESS()) return FALSE; | |
7bc95e2e | 805 | |
15c4dc5a | 806 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { |
7bc95e2e | 807 | b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; |
808 | if(MillerDecoding(b, 0)) { | |
809 | *len = Uart.len; | |
15c4dc5a | 810 | return TRUE; |
811 | } | |
7bc95e2e | 812 | } |
15c4dc5a | 813 | } |
814 | } | |
28afbd2b | 815 | |
6a1f2d82 | 816 | static int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNeeded); |
7bc95e2e | 817 | int EmSend4bitEx(uint8_t resp, bool correctionNeeded); |
28afbd2b | 818 | int EmSend4bit(uint8_t resp); |
6a1f2d82 | 819 | int EmSendCmdExPar(uint8_t *resp, uint16_t respLen, bool correctionNeeded, uint8_t *par); |
820 | int EmSendCmdEx(uint8_t *resp, uint16_t respLen, bool correctionNeeded); | |
821 | int EmSendCmd(uint8_t *resp, uint16_t respLen); | |
822 | int EmSendCmdPar(uint8_t *resp, uint16_t respLen, uint8_t *par); | |
823 | bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint8_t *reader_Parity, | |
824 | uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint8_t *tag_Parity); | |
15c4dc5a | 825 | |
ce02f6f9 | 826 | static uint8_t* free_buffer_pointer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); |
827 | ||
828 | typedef struct { | |
829 | uint8_t* response; | |
830 | size_t response_n; | |
831 | uint8_t* modulation; | |
832 | size_t modulation_n; | |
7bc95e2e | 833 | uint32_t ProxToAirDuration; |
ce02f6f9 | 834 | } tag_response_info_t; |
835 | ||
836 | void reset_free_buffer() { | |
837 | free_buffer_pointer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); | |
838 | } | |
839 | ||
840 | bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffer_size) { | |
7bc95e2e | 841 | // Example response, answer to MIFARE Classic read block will be 16 bytes + 2 CRC = 18 bytes |
ce02f6f9 | 842 | // This will need the following byte array for a modulation sequence |
843 | // 144 data bits (18 * 8) | |
844 | // 18 parity bits | |
845 | // 2 Start and stop | |
846 | // 1 Correction bit (Answer in 1172 or 1236 periods, see FPGA) | |
847 | // 1 just for the case | |
848 | // ----------- + | |
849 | // 166 bytes, since every bit that needs to be send costs us a byte | |
850 | // | |
851 | ||
852 | // Prepare the tag modulation bits from the message | |
853 | CodeIso14443aAsTag(response_info->response,response_info->response_n); | |
854 | ||
855 | // Make sure we do not exceed the free buffer space | |
856 | if (ToSendMax > max_buffer_size) { | |
857 | Dbprintf("Out of memory, when modulating bits for tag answer:"); | |
858 | Dbhexdump(response_info->response_n,response_info->response,false); | |
859 | return false; | |
860 | } | |
861 | ||
862 | // Copy the byte array, used for this modulation to the buffer position | |
863 | memcpy(response_info->modulation,ToSend,ToSendMax); | |
864 | ||
7bc95e2e | 865 | // Store the number of bytes that were used for encoding/modulation and the time needed to transfer them |
ce02f6f9 | 866 | response_info->modulation_n = ToSendMax; |
7bc95e2e | 867 | response_info->ProxToAirDuration = LastProxToAirDuration; |
ce02f6f9 | 868 | |
869 | return true; | |
870 | } | |
871 | ||
872 | bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) { | |
873 | // Retrieve and store the current buffer index | |
874 | response_info->modulation = free_buffer_pointer; | |
875 | ||
876 | // Determine the maximum size we can use from our buffer | |
6a1f2d82 | 877 | size_t max_buffer_size = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + FREE_BUFFER_SIZE) - free_buffer_pointer; |
ce02f6f9 | 878 | |
879 | // Forward the prepare tag modulation function to the inner function | |
880 | if (prepare_tag_modulation(response_info,max_buffer_size)) { | |
881 | // Update the free buffer offset | |
882 | free_buffer_pointer += ToSendMax; | |
883 | return true; | |
884 | } else { | |
885 | return false; | |
886 | } | |
887 | } | |
888 | ||
15c4dc5a | 889 | //----------------------------------------------------------------------------- |
890 | // Main loop of simulated tag: receive commands from reader, decide what | |
891 | // response to send, and send it. | |
892 | //----------------------------------------------------------------------------- | |
28afbd2b | 893 | void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) |
15c4dc5a | 894 | { |
5f6d6c90 | 895 | // Enable and clear the trace |
5f6d6c90 | 896 | iso14a_clear_trace(); |
7bc95e2e | 897 | iso14a_set_tracing(TRUE); |
81cd0474 | 898 | |
81cd0474 | 899 | uint8_t sak; |
900 | ||
901 | // The first response contains the ATQA (note: bytes are transmitted in reverse order). | |
902 | uint8_t response1[2]; | |
903 | ||
904 | switch (tagType) { | |
905 | case 1: { // MIFARE Classic | |
906 | // Says: I am Mifare 1k - original line | |
907 | response1[0] = 0x04; | |
908 | response1[1] = 0x00; | |
909 | sak = 0x08; | |
910 | } break; | |
911 | case 2: { // MIFARE Ultralight | |
912 | // Says: I am a stupid memory tag, no crypto | |
913 | response1[0] = 0x04; | |
914 | response1[1] = 0x00; | |
915 | sak = 0x00; | |
916 | } break; | |
917 | case 3: { // MIFARE DESFire | |
918 | // Says: I am a DESFire tag, ph33r me | |
919 | response1[0] = 0x04; | |
920 | response1[1] = 0x03; | |
921 | sak = 0x20; | |
922 | } break; | |
923 | case 4: { // ISO/IEC 14443-4 | |
924 | // Says: I am a javacard (JCOP) | |
925 | response1[0] = 0x04; | |
926 | response1[1] = 0x00; | |
927 | sak = 0x28; | |
928 | } break; | |
3fe4ff4f | 929 | case 5: { // MIFARE TNP3XXX |
930 | // Says: I am a toy | |
931 | response1[0] = 0x01; | |
932 | response1[1] = 0x0f; | |
933 | sak = 0x01; | |
934 | } break; | |
81cd0474 | 935 | default: { |
936 | Dbprintf("Error: unkown tagtype (%d)",tagType); | |
937 | return; | |
938 | } break; | |
939 | } | |
940 | ||
941 | // The second response contains the (mandatory) first 24 bits of the UID | |
942 | uint8_t response2[5]; | |
943 | ||
944 | // Check if the uid uses the (optional) part | |
945 | uint8_t response2a[5]; | |
946 | if (uid_2nd) { | |
947 | response2[0] = 0x88; | |
948 | num_to_bytes(uid_1st,3,response2+1); | |
949 | num_to_bytes(uid_2nd,4,response2a); | |
950 | response2a[4] = response2a[0] ^ response2a[1] ^ response2a[2] ^ response2a[3]; | |
951 | ||
952 | // Configure the ATQA and SAK accordingly | |
953 | response1[0] |= 0x40; | |
954 | sak |= 0x04; | |
955 | } else { | |
956 | num_to_bytes(uid_1st,4,response2); | |
957 | // Configure the ATQA and SAK accordingly | |
958 | response1[0] &= 0xBF; | |
959 | sak &= 0xFB; | |
960 | } | |
961 | ||
962 | // Calculate the BitCountCheck (BCC) for the first 4 bytes of the UID. | |
963 | response2[4] = response2[0] ^ response2[1] ^ response2[2] ^ response2[3]; | |
964 | ||
965 | // Prepare the mandatory SAK (for 4 and 7 byte UID) | |
966 | uint8_t response3[3]; | |
967 | response3[0] = sak; | |
968 | ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]); | |
969 | ||
970 | // Prepare the optional second SAK (for 7 byte UID), drop the cascade bit | |
971 | uint8_t response3a[3]; | |
972 | response3a[0] = sak & 0xFB; | |
973 | ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]); | |
974 | ||
254b70a4 | 975 | uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce |
6a1f2d82 | 976 | uint8_t response6[] = { 0x04, 0x58, 0x80, 0x02, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS: |
977 | // Format byte = 0x58: FSCI=0x08 (FSC=256), TA(1) and TC(1) present, | |
978 | // TA(1) = 0x80: different divisors not supported, DR = 1, DS = 1 | |
979 | // TB(1) = not present. Defaults: FWI = 4 (FWT = 256 * 16 * 2^4 * 1/fc = 4833us), SFGI = 0 (SFG = 256 * 16 * 2^0 * 1/fc = 302us) | |
980 | // TC(1) = 0x02: CID supported, NAD not supported | |
ce02f6f9 | 981 | ComputeCrc14443(CRC_14443_A, response6, 4, &response6[4], &response6[5]); |
982 | ||
7bc95e2e | 983 | #define TAG_RESPONSE_COUNT 7 |
984 | tag_response_info_t responses[TAG_RESPONSE_COUNT] = { | |
985 | { .response = response1, .response_n = sizeof(response1) }, // Answer to request - respond with card type | |
986 | { .response = response2, .response_n = sizeof(response2) }, // Anticollision cascade1 - respond with uid | |
987 | { .response = response2a, .response_n = sizeof(response2a) }, // Anticollision cascade2 - respond with 2nd half of uid if asked | |
988 | { .response = response3, .response_n = sizeof(response3) }, // Acknowledge select - cascade 1 | |
989 | { .response = response3a, .response_n = sizeof(response3a) }, // Acknowledge select - cascade 2 | |
990 | { .response = response5, .response_n = sizeof(response5) }, // Authentication answer (random nonce) | |
991 | { .response = response6, .response_n = sizeof(response6) }, // dummy ATS (pseudo-ATR), answer to RATS | |
992 | }; | |
993 | ||
994 | // Allocate 512 bytes for the dynamic modulation, created when the reader queries for it | |
995 | // Such a response is less time critical, so we can prepare them on the fly | |
996 | #define DYNAMIC_RESPONSE_BUFFER_SIZE 64 | |
997 | #define DYNAMIC_MODULATION_BUFFER_SIZE 512 | |
998 | uint8_t dynamic_response_buffer[DYNAMIC_RESPONSE_BUFFER_SIZE]; | |
999 | uint8_t dynamic_modulation_buffer[DYNAMIC_MODULATION_BUFFER_SIZE]; | |
1000 | tag_response_info_t dynamic_response_info = { | |
1001 | .response = dynamic_response_buffer, | |
1002 | .response_n = 0, | |
1003 | .modulation = dynamic_modulation_buffer, | |
1004 | .modulation_n = 0 | |
1005 | }; | |
ce02f6f9 | 1006 | |
7bc95e2e | 1007 | // Reset the offset pointer of the free buffer |
1008 | reset_free_buffer(); | |
ce02f6f9 | 1009 | |
7bc95e2e | 1010 | // Prepare the responses of the anticollision phase |
ce02f6f9 | 1011 | // there will be not enough time to do this at the moment the reader sends it REQA |
7bc95e2e | 1012 | for (size_t i=0; i<TAG_RESPONSE_COUNT; i++) { |
1013 | prepare_allocated_tag_modulation(&responses[i]); | |
1014 | } | |
15c4dc5a | 1015 | |
7bc95e2e | 1016 | int len = 0; |
15c4dc5a | 1017 | |
1018 | // To control where we are in the protocol | |
1019 | int order = 0; | |
1020 | int lastorder; | |
1021 | ||
1022 | // Just to allow some checks | |
1023 | int happened = 0; | |
1024 | int happened2 = 0; | |
81cd0474 | 1025 | int cmdsRecvd = 0; |
15c4dc5a | 1026 | |
254b70a4 | 1027 | // We need to listen to the high-frequency, peak-detected path. |
7bc95e2e | 1028 | iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN); |
15c4dc5a | 1029 | |
6a1f2d82 | 1030 | // buffers used on software Uart: |
1031 | uint8_t *receivedCmd = ((uint8_t *)BigBuf) + RECV_CMD_OFFSET; | |
1032 | uint8_t *receivedCmdPar = ((uint8_t *)BigBuf) + RECV_CMD_PAR_OFFSET; | |
1033 | ||
254b70a4 | 1034 | cmdsRecvd = 0; |
7bc95e2e | 1035 | tag_response_info_t* p_response; |
15c4dc5a | 1036 | |
254b70a4 | 1037 | LED_A_ON(); |
1038 | for(;;) { | |
7bc95e2e | 1039 | // Clean receive command buffer |
1040 | ||
6a1f2d82 | 1041 | if(!GetIso14443aCommandFromReader(receivedCmd, receivedCmdPar, &len)) { |
ce02f6f9 | 1042 | DbpString("Button press"); |
254b70a4 | 1043 | break; |
1044 | } | |
7bc95e2e | 1045 | |
1046 | p_response = NULL; | |
1047 | ||
254b70a4 | 1048 | // Okay, look at the command now. |
1049 | lastorder = order; | |
1050 | if(receivedCmd[0] == 0x26) { // Received a REQUEST | |
ce02f6f9 | 1051 | p_response = &responses[0]; order = 1; |
254b70a4 | 1052 | } else if(receivedCmd[0] == 0x52) { // Received a WAKEUP |
ce02f6f9 | 1053 | p_response = &responses[0]; order = 6; |
254b70a4 | 1054 | } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x93) { // Received request for UID (cascade 1) |
ce02f6f9 | 1055 | p_response = &responses[1]; order = 2; |
6a1f2d82 | 1056 | } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x95) { // Received request for UID (cascade 2) |
ce02f6f9 | 1057 | p_response = &responses[2]; order = 20; |
254b70a4 | 1058 | } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x93) { // Received a SELECT (cascade 1) |
ce02f6f9 | 1059 | p_response = &responses[3]; order = 3; |
254b70a4 | 1060 | } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x95) { // Received a SELECT (cascade 2) |
ce02f6f9 | 1061 | p_response = &responses[4]; order = 30; |
254b70a4 | 1062 | } else if(receivedCmd[0] == 0x30) { // Received a (plain) READ |
6a1f2d82 | 1063 | EmSendCmdEx(data+(4*receivedCmd[1]),16,false); |
7bc95e2e | 1064 | // Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]); |
5f6d6c90 | 1065 | // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below |
7bc95e2e | 1066 | p_response = NULL; |
254b70a4 | 1067 | } else if(receivedCmd[0] == 0x50) { // Received a HALT |
3fe4ff4f | 1068 | |
7bc95e2e | 1069 | if (tracing) { |
6a1f2d82 | 1070 | LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 1071 | } |
1072 | p_response = NULL; | |
254b70a4 | 1073 | } else if(receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61) { // Received an authentication request |
ce02f6f9 | 1074 | p_response = &responses[5]; order = 7; |
254b70a4 | 1075 | } else if(receivedCmd[0] == 0xE0) { // Received a RATS request |
7bc95e2e | 1076 | if (tagType == 1 || tagType == 2) { // RATS not supported |
1077 | EmSend4bit(CARD_NACK_NA); | |
1078 | p_response = NULL; | |
1079 | } else { | |
1080 | p_response = &responses[6]; order = 70; | |
1081 | } | |
6a1f2d82 | 1082 | } else if (order == 7 && len == 8) { // Received {nr] and {ar} (part of authentication) |
7bc95e2e | 1083 | if (tracing) { |
6a1f2d82 | 1084 | LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 1085 | } |
1086 | uint32_t nr = bytes_to_num(receivedCmd,4); | |
1087 | uint32_t ar = bytes_to_num(receivedCmd+4,4); | |
1088 | Dbprintf("Auth attempt {nr}{ar}: %08x %08x",nr,ar); | |
1089 | } else { | |
1090 | // Check for ISO 14443A-4 compliant commands, look at left nibble | |
1091 | switch (receivedCmd[0]) { | |
1092 | ||
1093 | case 0x0B: | |
1094 | case 0x0A: { // IBlock (command) | |
1095 | dynamic_response_info.response[0] = receivedCmd[0]; | |
1096 | dynamic_response_info.response[1] = 0x00; | |
1097 | dynamic_response_info.response[2] = 0x90; | |
1098 | dynamic_response_info.response[3] = 0x00; | |
1099 | dynamic_response_info.response_n = 4; | |
1100 | } break; | |
1101 | ||
1102 | case 0x1A: | |
1103 | case 0x1B: { // Chaining command | |
1104 | dynamic_response_info.response[0] = 0xaa | ((receivedCmd[0]) & 1); | |
1105 | dynamic_response_info.response_n = 2; | |
1106 | } break; | |
1107 | ||
1108 | case 0xaa: | |
1109 | case 0xbb: { | |
1110 | dynamic_response_info.response[0] = receivedCmd[0] ^ 0x11; | |
1111 | dynamic_response_info.response_n = 2; | |
1112 | } break; | |
1113 | ||
1114 | case 0xBA: { // | |
1115 | memcpy(dynamic_response_info.response,"\xAB\x00",2); | |
1116 | dynamic_response_info.response_n = 2; | |
1117 | } break; | |
1118 | ||
1119 | case 0xCA: | |
1120 | case 0xC2: { // Readers sends deselect command | |
1121 | memcpy(dynamic_response_info.response,"\xCA\x00",2); | |
1122 | dynamic_response_info.response_n = 2; | |
1123 | } break; | |
1124 | ||
1125 | default: { | |
1126 | // Never seen this command before | |
1127 | if (tracing) { | |
6a1f2d82 | 1128 | LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 1129 | } |
1130 | Dbprintf("Received unknown command (len=%d):",len); | |
1131 | Dbhexdump(len,receivedCmd,false); | |
1132 | // Do not respond | |
1133 | dynamic_response_info.response_n = 0; | |
1134 | } break; | |
1135 | } | |
ce02f6f9 | 1136 | |
7bc95e2e | 1137 | if (dynamic_response_info.response_n > 0) { |
1138 | // Copy the CID from the reader query | |
1139 | dynamic_response_info.response[1] = receivedCmd[1]; | |
ce02f6f9 | 1140 | |
7bc95e2e | 1141 | // Add CRC bytes, always used in ISO 14443A-4 compliant cards |
1142 | AppendCrc14443a(dynamic_response_info.response,dynamic_response_info.response_n); | |
1143 | dynamic_response_info.response_n += 2; | |
ce02f6f9 | 1144 | |
7bc95e2e | 1145 | if (prepare_tag_modulation(&dynamic_response_info,DYNAMIC_MODULATION_BUFFER_SIZE) == false) { |
1146 | Dbprintf("Error preparing tag response"); | |
1147 | if (tracing) { | |
6a1f2d82 | 1148 | LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 1149 | } |
1150 | break; | |
1151 | } | |
1152 | p_response = &dynamic_response_info; | |
1153 | } | |
81cd0474 | 1154 | } |
15c4dc5a | 1155 | |
1156 | // Count number of wakeups received after a halt | |
1157 | if(order == 6 && lastorder == 5) { happened++; } | |
1158 | ||
1159 | // Count number of other messages after a halt | |
1160 | if(order != 6 && lastorder == 5) { happened2++; } | |
1161 | ||
15c4dc5a | 1162 | if(cmdsRecvd > 999) { |
1163 | DbpString("1000 commands later..."); | |
254b70a4 | 1164 | break; |
15c4dc5a | 1165 | } |
ce02f6f9 | 1166 | cmdsRecvd++; |
1167 | ||
1168 | if (p_response != NULL) { | |
7bc95e2e | 1169 | EmSendCmd14443aRaw(p_response->modulation, p_response->modulation_n, receivedCmd[0] == 0x52); |
1170 | // do the tracing for the previous reader request and this tag answer: | |
6a1f2d82 | 1171 | uint8_t par[MAX_PARITY_SIZE]; |
1172 | GetParity(p_response->response, p_response->response_n, par); | |
3fe4ff4f | 1173 | |
7bc95e2e | 1174 | EmLogTrace(Uart.output, |
1175 | Uart.len, | |
1176 | Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, | |
1177 | Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, | |
6a1f2d82 | 1178 | Uart.parity, |
7bc95e2e | 1179 | p_response->response, |
1180 | p_response->response_n, | |
1181 | LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG, | |
1182 | (LastTimeProxToAirStart + p_response->ProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG, | |
6a1f2d82 | 1183 | par); |
7bc95e2e | 1184 | } |
1185 | ||
1186 | if (!tracing) { | |
1187 | Dbprintf("Trace Full. Simulation stopped."); | |
1188 | break; | |
1189 | } | |
1190 | } | |
15c4dc5a | 1191 | |
1192 | Dbprintf("%x %x %x", happened, happened2, cmdsRecvd); | |
1193 | LED_A_OFF(); | |
1194 | } | |
1195 | ||
9492e0b0 | 1196 | |
1197 | // prepare a delayed transfer. This simply shifts ToSend[] by a number | |
1198 | // of bits specified in the delay parameter. | |
1199 | void PrepareDelayedTransfer(uint16_t delay) | |
1200 | { | |
1201 | uint8_t bitmask = 0; | |
1202 | uint8_t bits_to_shift = 0; | |
1203 | uint8_t bits_shifted = 0; | |
1204 | ||
1205 | delay &= 0x07; | |
1206 | if (delay) { | |
1207 | for (uint16_t i = 0; i < delay; i++) { | |
1208 | bitmask |= (0x01 << i); | |
1209 | } | |
7bc95e2e | 1210 | ToSend[ToSendMax++] = 0x00; |
9492e0b0 | 1211 | for (uint16_t i = 0; i < ToSendMax; i++) { |
1212 | bits_to_shift = ToSend[i] & bitmask; | |
1213 | ToSend[i] = ToSend[i] >> delay; | |
1214 | ToSend[i] = ToSend[i] | (bits_shifted << (8 - delay)); | |
1215 | bits_shifted = bits_to_shift; | |
1216 | } | |
1217 | } | |
1218 | } | |
1219 | ||
7bc95e2e | 1220 | |
1221 | //------------------------------------------------------------------------------------- | |
15c4dc5a | 1222 | // Transmit the command (to the tag) that was placed in ToSend[]. |
9492e0b0 | 1223 | // Parameter timing: |
7bc95e2e | 1224 | // if NULL: transfer at next possible time, taking into account |
1225 | // request guard time and frame delay time | |
1226 | // if == 0: transfer immediately and return time of transfer | |
9492e0b0 | 1227 | // if != 0: delay transfer until time specified |
7bc95e2e | 1228 | //------------------------------------------------------------------------------------- |
6a1f2d82 | 1229 | static void TransmitFor14443a(const uint8_t *cmd, uint16_t len, uint32_t *timing) |
15c4dc5a | 1230 | { |
7bc95e2e | 1231 | |
9492e0b0 | 1232 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); |
e30c654b | 1233 | |
7bc95e2e | 1234 | uint32_t ThisTransferTime = 0; |
e30c654b | 1235 | |
9492e0b0 | 1236 | if (timing) { |
1237 | if(*timing == 0) { // Measure time | |
7bc95e2e | 1238 | *timing = (GetCountSspClk() + 8) & 0xfffffff8; |
9492e0b0 | 1239 | } else { |
1240 | PrepareDelayedTransfer(*timing & 0x00000007); // Delay transfer (fine tuning - up to 7 MF clock ticks) | |
1241 | } | |
7bc95e2e | 1242 | if(MF_DBGLEVEL >= 4 && GetCountSspClk() >= (*timing & 0xfffffff8)) Dbprintf("TransmitFor14443a: Missed timing"); |
1243 | while(GetCountSspClk() < (*timing & 0xfffffff8)); // Delay transfer (multiple of 8 MF clock ticks) | |
1244 | LastTimeProxToAirStart = *timing; | |
1245 | } else { | |
1246 | ThisTransferTime = ((MAX(NextTransferTime, GetCountSspClk()) & 0xfffffff8) + 8); | |
1247 | while(GetCountSspClk() < ThisTransferTime); | |
1248 | LastTimeProxToAirStart = ThisTransferTime; | |
9492e0b0 | 1249 | } |
1250 | ||
7bc95e2e | 1251 | // clear TXRDY |
1252 | AT91C_BASE_SSC->SSC_THR = SEC_Y; | |
1253 | ||
7bc95e2e | 1254 | uint16_t c = 0; |
9492e0b0 | 1255 | for(;;) { |
1256 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { | |
1257 | AT91C_BASE_SSC->SSC_THR = cmd[c]; | |
1258 | c++; | |
1259 | if(c >= len) { | |
1260 | break; | |
1261 | } | |
1262 | } | |
1263 | } | |
7bc95e2e | 1264 | |
1265 | NextTransferTime = MAX(NextTransferTime, LastTimeProxToAirStart + REQUEST_GUARD_TIME); | |
15c4dc5a | 1266 | } |
1267 | ||
7bc95e2e | 1268 | |
15c4dc5a | 1269 | //----------------------------------------------------------------------------- |
195af472 | 1270 | // Prepare reader command (in bits, support short frames) to send to FPGA |
15c4dc5a | 1271 | //----------------------------------------------------------------------------- |
6a1f2d82 | 1272 | void CodeIso14443aBitsAsReaderPar(const uint8_t *cmd, uint16_t bits, const uint8_t *parity) |
15c4dc5a | 1273 | { |
7bc95e2e | 1274 | int i, j; |
1275 | int last; | |
1276 | uint8_t b; | |
e30c654b | 1277 | |
7bc95e2e | 1278 | ToSendReset(); |
e30c654b | 1279 | |
7bc95e2e | 1280 | // Start of Communication (Seq. Z) |
1281 | ToSend[++ToSendMax] = SEC_Z; | |
1282 | LastProxToAirDuration = 8 * (ToSendMax+1) - 6; | |
1283 | last = 0; | |
1284 | ||
1285 | size_t bytecount = nbytes(bits); | |
1286 | // Generate send structure for the data bits | |
1287 | for (i = 0; i < bytecount; i++) { | |
1288 | // Get the current byte to send | |
1289 | b = cmd[i]; | |
1290 | size_t bitsleft = MIN((bits-(i*8)),8); | |
1291 | ||
1292 | for (j = 0; j < bitsleft; j++) { | |
1293 | if (b & 1) { | |
1294 | // Sequence X | |
1295 | ToSend[++ToSendMax] = SEC_X; | |
1296 | LastProxToAirDuration = 8 * (ToSendMax+1) - 2; | |
1297 | last = 1; | |
1298 | } else { | |
1299 | if (last == 0) { | |
1300 | // Sequence Z | |
1301 | ToSend[++ToSendMax] = SEC_Z; | |
1302 | LastProxToAirDuration = 8 * (ToSendMax+1) - 6; | |
1303 | } else { | |
1304 | // Sequence Y | |
1305 | ToSend[++ToSendMax] = SEC_Y; | |
1306 | last = 0; | |
1307 | } | |
1308 | } | |
1309 | b >>= 1; | |
1310 | } | |
1311 | ||
6a1f2d82 | 1312 | // Only transmit parity bit if we transmitted a complete byte |
7bc95e2e | 1313 | if (j == 8) { |
1314 | // Get the parity bit | |
6a1f2d82 | 1315 | if (parity[i>>3] & (0x80 >> (i&0x0007))) { |
7bc95e2e | 1316 | // Sequence X |
1317 | ToSend[++ToSendMax] = SEC_X; | |
1318 | LastProxToAirDuration = 8 * (ToSendMax+1) - 2; | |
1319 | last = 1; | |
1320 | } else { | |
1321 | if (last == 0) { | |
1322 | // Sequence Z | |
1323 | ToSend[++ToSendMax] = SEC_Z; | |
1324 | LastProxToAirDuration = 8 * (ToSendMax+1) - 6; | |
1325 | } else { | |
1326 | // Sequence Y | |
1327 | ToSend[++ToSendMax] = SEC_Y; | |
1328 | last = 0; | |
1329 | } | |
1330 | } | |
1331 | } | |
1332 | } | |
e30c654b | 1333 | |
7bc95e2e | 1334 | // End of Communication: Logic 0 followed by Sequence Y |
1335 | if (last == 0) { | |
1336 | // Sequence Z | |
1337 | ToSend[++ToSendMax] = SEC_Z; | |
1338 | LastProxToAirDuration = 8 * (ToSendMax+1) - 6; | |
1339 | } else { | |
1340 | // Sequence Y | |
1341 | ToSend[++ToSendMax] = SEC_Y; | |
1342 | last = 0; | |
1343 | } | |
1344 | ToSend[++ToSendMax] = SEC_Y; | |
e30c654b | 1345 | |
7bc95e2e | 1346 | // Convert to length of command: |
1347 | ToSendMax++; | |
15c4dc5a | 1348 | } |
1349 | ||
195af472 | 1350 | //----------------------------------------------------------------------------- |
1351 | // Prepare reader command to send to FPGA | |
1352 | //----------------------------------------------------------------------------- | |
6a1f2d82 | 1353 | void CodeIso14443aAsReaderPar(const uint8_t *cmd, uint16_t len, const uint8_t *parity) |
195af472 | 1354 | { |
6a1f2d82 | 1355 | CodeIso14443aBitsAsReaderPar(cmd, len*8, parity); |
195af472 | 1356 | } |
1357 | ||
9ca155ba M |
1358 | //----------------------------------------------------------------------------- |
1359 | // Wait for commands from reader | |
1360 | // Stop when button is pressed (return 1) or field was gone (return 2) | |
1361 | // Or return 0 when command is captured | |
1362 | //----------------------------------------------------------------------------- | |
6a1f2d82 | 1363 | static int EmGetCmd(uint8_t *received, uint16_t *len, uint8_t *parity) |
9ca155ba M |
1364 | { |
1365 | *len = 0; | |
1366 | ||
1367 | uint32_t timer = 0, vtime = 0; | |
1368 | int analogCnt = 0; | |
1369 | int analogAVG = 0; | |
1370 | ||
1371 | // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen | |
1372 | // only, since we are receiving, not transmitting). | |
1373 | // Signal field is off with the appropriate LED | |
1374 | LED_D_OFF(); | |
1375 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN); | |
1376 | ||
1377 | // Set ADC to read field strength | |
1378 | AT91C_BASE_ADC->ADC_CR = AT91C_ADC_SWRST; | |
1379 | AT91C_BASE_ADC->ADC_MR = | |
1380 | ADC_MODE_PRESCALE(32) | | |
1381 | ADC_MODE_STARTUP_TIME(16) | | |
1382 | ADC_MODE_SAMPLE_HOLD_TIME(8); | |
1383 | AT91C_BASE_ADC->ADC_CHER = ADC_CHANNEL(ADC_CHAN_HF); | |
1384 | // start ADC | |
1385 | AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START; | |
1386 | ||
1387 | // Now run a 'software UART' on the stream of incoming samples. | |
6a1f2d82 | 1388 | UartInit(received, parity); |
7bc95e2e | 1389 | |
1390 | // Clear RXRDY: | |
1391 | uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; | |
9ca155ba M |
1392 | |
1393 | for(;;) { | |
1394 | WDT_HIT(); | |
1395 | ||
1396 | if (BUTTON_PRESS()) return 1; | |
1397 | ||
1398 | // test if the field exists | |
1399 | if (AT91C_BASE_ADC->ADC_SR & ADC_END_OF_CONVERSION(ADC_CHAN_HF)) { | |
1400 | analogCnt++; | |
1401 | analogAVG += AT91C_BASE_ADC->ADC_CDR[ADC_CHAN_HF]; | |
1402 | AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START; | |
1403 | if (analogCnt >= 32) { | |
1404 | if ((33000 * (analogAVG / analogCnt) >> 10) < MF_MINFIELDV) { | |
1405 | vtime = GetTickCount(); | |
1406 | if (!timer) timer = vtime; | |
1407 | // 50ms no field --> card to idle state | |
1408 | if (vtime - timer > 50) return 2; | |
1409 | } else | |
1410 | if (timer) timer = 0; | |
1411 | analogCnt = 0; | |
1412 | analogAVG = 0; | |
1413 | } | |
1414 | } | |
7bc95e2e | 1415 | |
9ca155ba | 1416 | // receive and test the miller decoding |
7bc95e2e | 1417 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { |
1418 | b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; | |
1419 | if(MillerDecoding(b, 0)) { | |
1420 | *len = Uart.len; | |
9ca155ba M |
1421 | return 0; |
1422 | } | |
7bc95e2e | 1423 | } |
1424 | ||
9ca155ba M |
1425 | } |
1426 | } | |
1427 | ||
9ca155ba | 1428 | |
6a1f2d82 | 1429 | static int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNeeded) |
7bc95e2e | 1430 | { |
1431 | uint8_t b; | |
1432 | uint16_t i = 0; | |
1433 | uint32_t ThisTransferTime; | |
1434 | ||
9ca155ba M |
1435 | // Modulate Manchester |
1436 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD); | |
7bc95e2e | 1437 | |
1438 | // include correction bit if necessary | |
1439 | if (Uart.parityBits & 0x01) { | |
1440 | correctionNeeded = TRUE; | |
1441 | } | |
1442 | if(correctionNeeded) { | |
9ca155ba M |
1443 | // 1236, so correction bit needed |
1444 | i = 0; | |
7bc95e2e | 1445 | } else { |
1446 | i = 1; | |
9ca155ba | 1447 | } |
7bc95e2e | 1448 | |
d714d3ef | 1449 | // clear receiving shift register and holding register |
7bc95e2e | 1450 | while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)); |
1451 | b = AT91C_BASE_SSC->SSC_RHR; (void) b; | |
1452 | while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)); | |
1453 | b = AT91C_BASE_SSC->SSC_RHR; (void) b; | |
9ca155ba | 1454 | |
7bc95e2e | 1455 | // wait for the FPGA to signal fdt_indicator == 1 (the FPGA is ready to queue new data in its delay line) |
1456 | for (uint16_t j = 0; j < 5; j++) { // allow timeout - better late than never | |
1457 | while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)); | |
1458 | if (AT91C_BASE_SSC->SSC_RHR) break; | |
1459 | } | |
1460 | ||
1461 | while ((ThisTransferTime = GetCountSspClk()) & 0x00000007); | |
1462 | ||
1463 | // Clear TXRDY: | |
1464 | AT91C_BASE_SSC->SSC_THR = SEC_F; | |
1465 | ||
9ca155ba | 1466 | // send cycle |
7bc95e2e | 1467 | for(; i <= respLen; ) { |
9ca155ba | 1468 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { |
7bc95e2e | 1469 | AT91C_BASE_SSC->SSC_THR = resp[i++]; |
1470 | FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR; | |
9ca155ba | 1471 | } |
7bc95e2e | 1472 | |
9ca155ba M |
1473 | if(BUTTON_PRESS()) { |
1474 | break; | |
1475 | } | |
1476 | } | |
1477 | ||
7bc95e2e | 1478 | // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again: |
1479 | for (i = 0; i < 2 ; ) { | |
1480 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { | |
1481 | AT91C_BASE_SSC->SSC_THR = SEC_F; | |
1482 | FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR; | |
1483 | i++; | |
1484 | } | |
1485 | } | |
1486 | ||
1487 | LastTimeProxToAirStart = ThisTransferTime + (correctionNeeded?8:0); | |
1488 | ||
9ca155ba M |
1489 | return 0; |
1490 | } | |
1491 | ||
7bc95e2e | 1492 | int EmSend4bitEx(uint8_t resp, bool correctionNeeded){ |
1493 | Code4bitAnswerAsTag(resp); | |
0a39986e | 1494 | int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded); |
7bc95e2e | 1495 | // do the tracing for the previous reader request and this tag answer: |
6a1f2d82 | 1496 | uint8_t par[1]; |
1497 | GetParity(&resp, 1, par); | |
7bc95e2e | 1498 | EmLogTrace(Uart.output, |
1499 | Uart.len, | |
1500 | Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, | |
1501 | Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, | |
6a1f2d82 | 1502 | Uart.parity, |
7bc95e2e | 1503 | &resp, |
1504 | 1, | |
1505 | LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG, | |
1506 | (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG, | |
6a1f2d82 | 1507 | par); |
0a39986e | 1508 | return res; |
9ca155ba M |
1509 | } |
1510 | ||
8f51ddb0 | 1511 | int EmSend4bit(uint8_t resp){ |
7bc95e2e | 1512 | return EmSend4bitEx(resp, false); |
8f51ddb0 M |
1513 | } |
1514 | ||
6a1f2d82 | 1515 | int EmSendCmdExPar(uint8_t *resp, uint16_t respLen, bool correctionNeeded, uint8_t *par){ |
7bc95e2e | 1516 | CodeIso14443aAsTagPar(resp, respLen, par); |
8f51ddb0 | 1517 | int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded); |
7bc95e2e | 1518 | // do the tracing for the previous reader request and this tag answer: |
1519 | EmLogTrace(Uart.output, | |
1520 | Uart.len, | |
1521 | Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, | |
1522 | Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, | |
6a1f2d82 | 1523 | Uart.parity, |
7bc95e2e | 1524 | resp, |
1525 | respLen, | |
1526 | LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG, | |
1527 | (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG, | |
6a1f2d82 | 1528 | par); |
8f51ddb0 M |
1529 | return res; |
1530 | } | |
1531 | ||
6a1f2d82 | 1532 | int EmSendCmdEx(uint8_t *resp, uint16_t respLen, bool correctionNeeded){ |
1533 | uint8_t par[MAX_PARITY_SIZE]; | |
1534 | GetParity(resp, respLen, par); | |
1535 | return EmSendCmdExPar(resp, respLen, correctionNeeded, par); | |
8f51ddb0 M |
1536 | } |
1537 | ||
6a1f2d82 | 1538 | int EmSendCmd(uint8_t *resp, uint16_t respLen){ |
1539 | uint8_t par[MAX_PARITY_SIZE]; | |
1540 | GetParity(resp, respLen, par); | |
1541 | return EmSendCmdExPar(resp, respLen, false, par); | |
8f51ddb0 M |
1542 | } |
1543 | ||
6a1f2d82 | 1544 | int EmSendCmdPar(uint8_t *resp, uint16_t respLen, uint8_t *par){ |
7bc95e2e | 1545 | return EmSendCmdExPar(resp, respLen, false, par); |
1546 | } | |
1547 | ||
6a1f2d82 | 1548 | bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint8_t *reader_Parity, |
1549 | uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint8_t *tag_Parity) | |
7bc95e2e | 1550 | { |
1551 | if (tracing) { | |
1552 | // we cannot exactly measure the end and start of a received command from reader. However we know that the delay from | |
1553 | // end of the received command to start of the tag's (simulated by us) answer is n*128+20 or n*128+84 resp. | |
1554 | // with n >= 9. The start of the tags answer can be measured and therefore the end of the received command be calculated: | |
1555 | uint16_t reader_modlen = reader_EndTime - reader_StartTime; | |
1556 | uint16_t approx_fdt = tag_StartTime - reader_EndTime; | |
1557 | uint16_t exact_fdt = (approx_fdt - 20 + 32)/64 * 64 + 20; | |
1558 | reader_EndTime = tag_StartTime - exact_fdt; | |
1559 | reader_StartTime = reader_EndTime - reader_modlen; | |
6a1f2d82 | 1560 | if (!LogTrace(reader_data, reader_len, reader_StartTime, reader_EndTime, reader_Parity, TRUE)) { |
7bc95e2e | 1561 | return FALSE; |
6a1f2d82 | 1562 | } else return(!LogTrace(tag_data, tag_len, tag_StartTime, tag_EndTime, tag_Parity, FALSE)); |
7bc95e2e | 1563 | } else { |
1564 | return TRUE; | |
1565 | } | |
9ca155ba M |
1566 | } |
1567 | ||
15c4dc5a | 1568 | //----------------------------------------------------------------------------- |
1569 | // Wait a certain time for tag response | |
1570 | // If a response is captured return TRUE | |
e691fc45 | 1571 | // If it takes too long return FALSE |
15c4dc5a | 1572 | //----------------------------------------------------------------------------- |
6a1f2d82 | 1573 | static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint8_t *receivedResponsePar, uint16_t offset) |
15c4dc5a | 1574 | { |
52bfb955 | 1575 | uint32_t c; |
e691fc45 | 1576 | |
15c4dc5a | 1577 | // Set FPGA mode to "reader listen mode", no modulation (listen |
534983d7 | 1578 | // only, since we are receiving, not transmitting). |
1579 | // Signal field is on with the appropriate LED | |
1580 | LED_D_ON(); | |
1581 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN); | |
1c611bbd | 1582 | |
534983d7 | 1583 | // Now get the answer from the card |
6a1f2d82 | 1584 | DemodInit(receivedResponse, receivedResponsePar); |
15c4dc5a | 1585 | |
7bc95e2e | 1586 | // clear RXRDY: |
1587 | uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; | |
1588 | ||
15c4dc5a | 1589 | c = 0; |
1590 | for(;;) { | |
534983d7 | 1591 | WDT_HIT(); |
15c4dc5a | 1592 | |
534983d7 | 1593 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { |
534983d7 | 1594 | b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; |
7bc95e2e | 1595 | if(ManchesterDecoding(b, offset, 0)) { |
1596 | NextTransferTime = MAX(NextTransferTime, Demod.endTime - (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/16 + FRAME_DELAY_TIME_PICC_TO_PCD); | |
15c4dc5a | 1597 | return TRUE; |
6a1f2d82 | 1598 | } else if (c++ > iso14a_timeout) { |
7bc95e2e | 1599 | return FALSE; |
15c4dc5a | 1600 | } |
534983d7 | 1601 | } |
1602 | } | |
15c4dc5a | 1603 | } |
1604 | ||
6a1f2d82 | 1605 | void ReaderTransmitBitsPar(uint8_t* frame, uint16_t bits, uint8_t *par, uint32_t *timing) |
15c4dc5a | 1606 | { |
6a1f2d82 | 1607 | CodeIso14443aBitsAsReaderPar(frame, bits, par); |
dfc3c505 | 1608 | |
7bc95e2e | 1609 | // Send command to tag |
1610 | TransmitFor14443a(ToSend, ToSendMax, timing); | |
1611 | if(trigger) | |
1612 | LED_A_ON(); | |
dfc3c505 | 1613 | |
7bc95e2e | 1614 | // Log reader command in trace buffer |
1615 | if (tracing) { | |
6a1f2d82 | 1616 | LogTrace(frame, nbytes(bits), LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_READER, (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_READER, par, TRUE); |
7bc95e2e | 1617 | } |
15c4dc5a | 1618 | } |
1619 | ||
6a1f2d82 | 1620 | void ReaderTransmitPar(uint8_t* frame, uint16_t len, uint8_t *par, uint32_t *timing) |
dfc3c505 | 1621 | { |
6a1f2d82 | 1622 | ReaderTransmitBitsPar(frame, len*8, par, timing); |
dfc3c505 | 1623 | } |
15c4dc5a | 1624 | |
6a1f2d82 | 1625 | void ReaderTransmitBits(uint8_t* frame, uint16_t len, uint32_t *timing) |
e691fc45 | 1626 | { |
1627 | // Generate parity and redirect | |
6a1f2d82 | 1628 | uint8_t par[MAX_PARITY_SIZE]; |
1629 | GetParity(frame, len/8, par); | |
1630 | ReaderTransmitBitsPar(frame, len, par, timing); | |
e691fc45 | 1631 | } |
1632 | ||
6a1f2d82 | 1633 | void ReaderTransmit(uint8_t* frame, uint16_t len, uint32_t *timing) |
15c4dc5a | 1634 | { |
1635 | // Generate parity and redirect | |
6a1f2d82 | 1636 | uint8_t par[MAX_PARITY_SIZE]; |
1637 | GetParity(frame, len, par); | |
1638 | ReaderTransmitBitsPar(frame, len*8, par, timing); | |
15c4dc5a | 1639 | } |
1640 | ||
6a1f2d82 | 1641 | int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t *parity) |
e691fc45 | 1642 | { |
6a1f2d82 | 1643 | if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, offset)) return FALSE; |
7bc95e2e | 1644 | if (tracing) { |
6a1f2d82 | 1645 | LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE); |
7bc95e2e | 1646 | } |
e691fc45 | 1647 | return Demod.len; |
1648 | } | |
1649 | ||
6a1f2d82 | 1650 | int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity) |
15c4dc5a | 1651 | { |
6a1f2d82 | 1652 | if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, 0)) return FALSE; |
7bc95e2e | 1653 | if (tracing) { |
6a1f2d82 | 1654 | LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE); |
7bc95e2e | 1655 | } |
e691fc45 | 1656 | return Demod.len; |
f89c7050 M |
1657 | } |
1658 | ||
e691fc45 | 1659 | /* performs iso14443a anticollision procedure |
534983d7 | 1660 | * fills the uid pointer unless NULL |
1661 | * fills resp_data unless NULL */ | |
6a1f2d82 | 1662 | int iso14443a_select_card(byte_t *uid_ptr, iso14a_card_select_t *p_hi14a_card, uint32_t *cuid_ptr) { |
1663 | uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP | |
1664 | uint8_t sel_all[] = { 0x93,0x20 }; | |
1665 | uint8_t sel_uid[] = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00}; | |
1666 | uint8_t rats[] = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0 | |
1667 | uint8_t *resp = ((uint8_t *)BigBuf) + RECV_RESP_OFFSET; | |
1668 | uint8_t *resp_par = ((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET; | |
1669 | byte_t uid_resp[4]; | |
1670 | size_t uid_resp_len; | |
1671 | ||
1672 | uint8_t sak = 0x04; // cascade uid | |
1673 | int cascade_level = 0; | |
1674 | int len; | |
1675 | ||
1676 | // Broadcast for a card, WUPA (0x52) will force response from all cards in the field | |
9492e0b0 | 1677 | ReaderTransmitBitsPar(wupa,7,0, NULL); |
7bc95e2e | 1678 | |
6a1f2d82 | 1679 | // Receive the ATQA |
1680 | if(!ReaderReceive(resp, resp_par)) return 0; | |
6a1f2d82 | 1681 | |
1682 | if(p_hi14a_card) { | |
1683 | memcpy(p_hi14a_card->atqa, resp, 2); | |
1684 | p_hi14a_card->uidlen = 0; | |
1685 | memset(p_hi14a_card->uid,0,10); | |
1686 | } | |
5f6d6c90 | 1687 | |
6a1f2d82 | 1688 | // clear uid |
1689 | if (uid_ptr) { | |
1690 | memset(uid_ptr,0,10); | |
1691 | } | |
79a73ab2 | 1692 | |
6a1f2d82 | 1693 | // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in |
1694 | // which case we need to make a cascade 2 request and select - this is a long UID | |
1695 | // While the UID is not complete, the 3nd bit (from the right) is set in the SAK. | |
1696 | for(; sak & 0x04; cascade_level++) { | |
1697 | // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97) | |
1698 | sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2; | |
1699 | ||
1700 | // SELECT_ALL | |
1701 | ReaderTransmit(sel_all, sizeof(sel_all), NULL); | |
1702 | if (!ReaderReceive(resp, resp_par)) return 0; | |
1703 | ||
1704 | if (Demod.collisionPos) { // we had a collision and need to construct the UID bit by bit | |
1705 | memset(uid_resp, 0, 4); | |
1706 | uint16_t uid_resp_bits = 0; | |
1707 | uint16_t collision_answer_offset = 0; | |
1708 | // anti-collision-loop: | |
1709 | while (Demod.collisionPos) { | |
1710 | Dbprintf("Multiple tags detected. Collision after Bit %d", Demod.collisionPos); | |
1711 | for (uint16_t i = collision_answer_offset; i < Demod.collisionPos; i++, uid_resp_bits++) { // add valid UID bits before collision point | |
1712 | uint16_t UIDbit = (resp[i/8] >> (i % 8)) & 0x01; | |
758f1fd1 | 1713 | uid_resp[uid_resp_bits / 8] |= UIDbit << (uid_resp_bits % 8); |
6a1f2d82 | 1714 | } |
1715 | uid_resp[uid_resp_bits/8] |= 1 << (uid_resp_bits % 8); // next time select the card(s) with a 1 in the collision position | |
1716 | uid_resp_bits++; | |
1717 | // construct anticollosion command: | |
1718 | sel_uid[1] = ((2 + uid_resp_bits/8) << 4) | (uid_resp_bits & 0x07); // length of data in bytes and bits | |
1719 | for (uint16_t i = 0; i <= uid_resp_bits/8; i++) { | |
1720 | sel_uid[2+i] = uid_resp[i]; | |
1721 | } | |
1722 | collision_answer_offset = uid_resp_bits%8; | |
1723 | ReaderTransmitBits(sel_uid, 16 + uid_resp_bits, NULL); | |
1724 | if (!ReaderReceiveOffset(resp, collision_answer_offset, resp_par)) return 0; | |
e691fc45 | 1725 | } |
6a1f2d82 | 1726 | // finally, add the last bits and BCC of the UID |
1727 | for (uint16_t i = collision_answer_offset; i < (Demod.len-1)*8; i++, uid_resp_bits++) { | |
1728 | uint16_t UIDbit = (resp[i/8] >> (i%8)) & 0x01; | |
1729 | uid_resp[uid_resp_bits/8] |= UIDbit << (uid_resp_bits % 8); | |
e691fc45 | 1730 | } |
e691fc45 | 1731 | |
6a1f2d82 | 1732 | } else { // no collision, use the response to SELECT_ALL as current uid |
1733 | memcpy(uid_resp, resp, 4); | |
1734 | } | |
1735 | uid_resp_len = 4; | |
5f6d6c90 | 1736 | |
6a1f2d82 | 1737 | // calculate crypto UID. Always use last 4 Bytes. |
1738 | if(cuid_ptr) { | |
1739 | *cuid_ptr = bytes_to_num(uid_resp, 4); | |
1740 | } | |
e30c654b | 1741 | |
6a1f2d82 | 1742 | // Construct SELECT UID command |
1743 | sel_uid[1] = 0x70; // transmitting a full UID (1 Byte cmd, 1 Byte NVB, 4 Byte UID, 1 Byte BCC, 2 Bytes CRC) | |
1744 | memcpy(sel_uid+2, uid_resp, 4); // the UID | |
1745 | sel_uid[6] = sel_uid[2] ^ sel_uid[3] ^ sel_uid[4] ^ sel_uid[5]; // calculate and add BCC | |
1746 | AppendCrc14443a(sel_uid, 7); // calculate and add CRC | |
1747 | ReaderTransmit(sel_uid, sizeof(sel_uid), NULL); | |
1748 | ||
1749 | // Receive the SAK | |
1750 | if (!ReaderReceive(resp, resp_par)) return 0; | |
1751 | sak = resp[0]; | |
1752 | ||
52ab55ab | 1753 | // Test if more parts of the uid are coming |
6a1f2d82 | 1754 | if ((sak & 0x04) /* && uid_resp[0] == 0x88 */) { |
1755 | // Remove first byte, 0x88 is not an UID byte, it CT, see page 3 of: | |
1756 | // http://www.nxp.com/documents/application_note/AN10927.pdf | |
6a1f2d82 | 1757 | uid_resp[0] = uid_resp[1]; |
1758 | uid_resp[1] = uid_resp[2]; | |
1759 | uid_resp[2] = uid_resp[3]; | |
1760 | ||
1761 | uid_resp_len = 3; | |
1762 | } | |
5f6d6c90 | 1763 | |
6a1f2d82 | 1764 | if(uid_ptr) { |
1765 | memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len); | |
1766 | } | |
5f6d6c90 | 1767 | |
6a1f2d82 | 1768 | if(p_hi14a_card) { |
1769 | memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len); | |
1770 | p_hi14a_card->uidlen += uid_resp_len; | |
1771 | } | |
1772 | } | |
79a73ab2 | 1773 | |
6a1f2d82 | 1774 | if(p_hi14a_card) { |
1775 | p_hi14a_card->sak = sak; | |
1776 | p_hi14a_card->ats_len = 0; | |
1777 | } | |
534983d7 | 1778 | |
3fe4ff4f | 1779 | // non iso14443a compliant tag |
1780 | if( (sak & 0x20) == 0) return 2; | |
534983d7 | 1781 | |
6a1f2d82 | 1782 | // Request for answer to select |
1783 | AppendCrc14443a(rats, 2); | |
1784 | ReaderTransmit(rats, sizeof(rats), NULL); | |
1c611bbd | 1785 | |
6a1f2d82 | 1786 | if (!(len = ReaderReceive(resp, resp_par))) return 0; |
5191b3d1 | 1787 | |
3fe4ff4f | 1788 | |
6a1f2d82 | 1789 | if(p_hi14a_card) { |
1790 | memcpy(p_hi14a_card->ats, resp, sizeof(p_hi14a_card->ats)); | |
1791 | p_hi14a_card->ats_len = len; | |
1792 | } | |
5f6d6c90 | 1793 | |
6a1f2d82 | 1794 | // reset the PCB block number |
1795 | iso14_pcb_blocknum = 0; | |
6a1f2d82 | 1796 | return 1; |
7e758047 | 1797 | } |
15c4dc5a | 1798 | |
7bc95e2e | 1799 | void iso14443a_setup(uint8_t fpga_minor_mode) { |
7cc204bf | 1800 | FpgaDownloadAndGo(FPGA_BITSTREAM_HF); |
9492e0b0 | 1801 | // Set up the synchronous serial port |
1802 | FpgaSetupSsc(); | |
7bc95e2e | 1803 | // connect Demodulated Signal to ADC: |
7e758047 | 1804 | SetAdcMuxFor(GPIO_MUXSEL_HIPKD); |
e30c654b | 1805 | |
7e758047 | 1806 | // Signal field is on with the appropriate LED |
7bc95e2e | 1807 | if (fpga_minor_mode == FPGA_HF_ISO14443A_READER_MOD |
1808 | || fpga_minor_mode == FPGA_HF_ISO14443A_READER_LISTEN) { | |
1809 | LED_D_ON(); | |
1810 | } else { | |
1811 | LED_D_OFF(); | |
1812 | } | |
1813 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | fpga_minor_mode); | |
534983d7 | 1814 | |
7bc95e2e | 1815 | // Start the timer |
1816 | StartCountSspClk(); | |
1817 | ||
1818 | DemodReset(); | |
1819 | UartReset(); | |
1820 | NextTransferTime = 2*DELAY_ARM2AIR_AS_READER; | |
1821 | iso14a_set_timeout(1050); // 10ms default | |
7e758047 | 1822 | } |
15c4dc5a | 1823 | |
6a1f2d82 | 1824 | int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) { |
1825 | uint8_t parity[MAX_PARITY_SIZE]; | |
534983d7 | 1826 | uint8_t real_cmd[cmd_len+4]; |
1827 | real_cmd[0] = 0x0a; //I-Block | |
b0127e65 | 1828 | // put block number into the PCB |
1829 | real_cmd[0] |= iso14_pcb_blocknum; | |
534983d7 | 1830 | real_cmd[1] = 0x00; //CID: 0 //FIXME: allow multiple selected cards |
1831 | memcpy(real_cmd+2, cmd, cmd_len); | |
1832 | AppendCrc14443a(real_cmd,cmd_len+2); | |
1833 | ||
9492e0b0 | 1834 | ReaderTransmit(real_cmd, cmd_len+4, NULL); |
6a1f2d82 | 1835 | size_t len = ReaderReceive(data, parity); |
1836 | uint8_t *data_bytes = (uint8_t *) data; | |
b0127e65 | 1837 | if (!len) |
1838 | return 0; //DATA LINK ERROR | |
1839 | // if we received an I- or R(ACK)-Block with a block number equal to the | |
1840 | // current block number, toggle the current block number | |
1841 | else if (len >= 4 // PCB+CID+CRC = 4 bytes | |
1842 | && ((data_bytes[0] & 0xC0) == 0 // I-Block | |
1843 | || (data_bytes[0] & 0xD0) == 0x80) // R-Block with ACK bit set to 0 | |
1844 | && (data_bytes[0] & 0x01) == iso14_pcb_blocknum) // equal block numbers | |
1845 | { | |
1846 | iso14_pcb_blocknum ^= 1; | |
1847 | } | |
1848 | ||
534983d7 | 1849 | return len; |
1850 | } | |
1851 | ||
7e758047 | 1852 | //----------------------------------------------------------------------------- |
1853 | // Read an ISO 14443a tag. Send out commands and store answers. | |
1854 | // | |
1855 | //----------------------------------------------------------------------------- | |
7bc95e2e | 1856 | void ReaderIso14443a(UsbCommand *c) |
7e758047 | 1857 | { |
534983d7 | 1858 | iso14a_command_t param = c->arg[0]; |
7bc95e2e | 1859 | uint8_t *cmd = c->d.asBytes; |
534983d7 | 1860 | size_t len = c->arg[1]; |
5f6d6c90 | 1861 | size_t lenbits = c->arg[2]; |
9492e0b0 | 1862 | uint32_t arg0 = 0; |
1863 | byte_t buf[USB_CMD_DATA_SIZE]; | |
6a1f2d82 | 1864 | uint8_t par[MAX_PARITY_SIZE]; |
902cb3c0 | 1865 | |
5f6d6c90 | 1866 | if(param & ISO14A_CONNECT) { |
1867 | iso14a_clear_trace(); | |
1868 | } | |
e691fc45 | 1869 | |
7bc95e2e | 1870 | iso14a_set_tracing(TRUE); |
e30c654b | 1871 | |
79a73ab2 | 1872 | if(param & ISO14A_REQUEST_TRIGGER) { |
7bc95e2e | 1873 | iso14a_set_trigger(TRUE); |
9492e0b0 | 1874 | } |
15c4dc5a | 1875 | |
534983d7 | 1876 | if(param & ISO14A_CONNECT) { |
7bc95e2e | 1877 | iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); |
5f6d6c90 | 1878 | if(!(param & ISO14A_NO_SELECT)) { |
1879 | iso14a_card_select_t *card = (iso14a_card_select_t*)buf; | |
1880 | arg0 = iso14443a_select_card(NULL,card,NULL); | |
1881 | cmd_send(CMD_ACK,arg0,card->uidlen,0,buf,sizeof(iso14a_card_select_t)); | |
1882 | } | |
534983d7 | 1883 | } |
e30c654b | 1884 | |
534983d7 | 1885 | if(param & ISO14A_SET_TIMEOUT) { |
3fe4ff4f | 1886 | iso14a_set_timeout(c->arg[2]); |
534983d7 | 1887 | } |
e30c654b | 1888 | |
534983d7 | 1889 | if(param & ISO14A_APDU) { |
902cb3c0 | 1890 | arg0 = iso14_apdu(cmd, len, buf); |
79a73ab2 | 1891 | cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf)); |
534983d7 | 1892 | } |
e30c654b | 1893 | |
534983d7 | 1894 | if(param & ISO14A_RAW) { |
1895 | if(param & ISO14A_APPEND_CRC) { | |
1896 | AppendCrc14443a(cmd,len); | |
1897 | len += 2; | |
c7324bef | 1898 | if (lenbits) lenbits += 16; |
15c4dc5a | 1899 | } |
5f6d6c90 | 1900 | if(lenbits>0) { |
6a1f2d82 | 1901 | GetParity(cmd, lenbits/8, par); |
1902 | ReaderTransmitBitsPar(cmd, lenbits, par, NULL); | |
5f6d6c90 | 1903 | } else { |
1904 | ReaderTransmit(cmd,len, NULL); | |
1905 | } | |
6a1f2d82 | 1906 | arg0 = ReaderReceive(buf, par); |
9492e0b0 | 1907 | cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf)); |
534983d7 | 1908 | } |
15c4dc5a | 1909 | |
79a73ab2 | 1910 | if(param & ISO14A_REQUEST_TRIGGER) { |
7bc95e2e | 1911 | iso14a_set_trigger(FALSE); |
9492e0b0 | 1912 | } |
15c4dc5a | 1913 | |
79a73ab2 | 1914 | if(param & ISO14A_NO_DISCONNECT) { |
534983d7 | 1915 | return; |
9492e0b0 | 1916 | } |
15c4dc5a | 1917 | |
15c4dc5a | 1918 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); |
1919 | LEDsoff(); | |
15c4dc5a | 1920 | } |
b0127e65 | 1921 | |
1c611bbd | 1922 | |
1c611bbd | 1923 | // Determine the distance between two nonces. |
1924 | // Assume that the difference is small, but we don't know which is first. | |
1925 | // Therefore try in alternating directions. | |
1926 | int32_t dist_nt(uint32_t nt1, uint32_t nt2) { | |
1927 | ||
1928 | uint16_t i; | |
1929 | uint32_t nttmp1, nttmp2; | |
e772353f | 1930 | |
1c611bbd | 1931 | if (nt1 == nt2) return 0; |
1932 | ||
1933 | nttmp1 = nt1; | |
1934 | nttmp2 = nt2; | |
1935 | ||
1936 | for (i = 1; i < 32768; i++) { | |
1937 | nttmp1 = prng_successor(nttmp1, 1); | |
1938 | if (nttmp1 == nt2) return i; | |
1939 | nttmp2 = prng_successor(nttmp2, 1); | |
1940 | if (nttmp2 == nt1) return -i; | |
1941 | } | |
1942 | ||
1943 | return(-99999); // either nt1 or nt2 are invalid nonces | |
e772353f | 1944 | } |
1945 | ||
e772353f | 1946 | |
1c611bbd | 1947 | //----------------------------------------------------------------------------- |
1948 | // Recover several bits of the cypher stream. This implements (first stages of) | |
1949 | // the algorithm described in "The Dark Side of Security by Obscurity and | |
1950 | // Cloning MiFare Classic Rail and Building Passes, Anywhere, Anytime" | |
1951 | // (article by Nicolas T. Courtois, 2009) | |
1952 | //----------------------------------------------------------------------------- | |
1953 | void ReaderMifare(bool first_try) | |
1954 | { | |
1955 | // Mifare AUTH | |
1956 | uint8_t mf_auth[] = { 0x60,0x00,0xf5,0x7b }; | |
1957 | uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }; | |
1958 | static uint8_t mf_nr_ar3; | |
e772353f | 1959 | |
6a1f2d82 | 1960 | uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET); |
1961 | uint8_t* receivedAnswerPar = (((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET); | |
7bc95e2e | 1962 | |
d2f487af | 1963 | iso14a_clear_trace(); |
7bc95e2e | 1964 | iso14a_set_tracing(TRUE); |
e772353f | 1965 | |
1c611bbd | 1966 | byte_t nt_diff = 0; |
6a1f2d82 | 1967 | uint8_t par[1] = {0}; // maximum 8 Bytes to be sent here, 1 byte parity is therefore enough |
1c611bbd | 1968 | static byte_t par_low = 0; |
1969 | bool led_on = TRUE; | |
ca4714cd | 1970 | uint8_t uid[10] ={0}; |
1c611bbd | 1971 | uint32_t cuid; |
e772353f | 1972 | |
6a1f2d82 | 1973 | uint32_t nt = 0; |
2ed270a8 | 1974 | uint32_t previous_nt = 0; |
1c611bbd | 1975 | static uint32_t nt_attacked = 0; |
3fe4ff4f | 1976 | byte_t par_list[8] = {0x00}; |
1977 | byte_t ks_list[8] = {0x00}; | |
e772353f | 1978 | |
1c611bbd | 1979 | static uint32_t sync_time; |
1980 | static uint32_t sync_cycles; | |
1981 | int catch_up_cycles = 0; | |
1982 | int last_catch_up = 0; | |
1983 | uint16_t consecutive_resyncs = 0; | |
1984 | int isOK = 0; | |
e772353f | 1985 | |
1c611bbd | 1986 | if (first_try) { |
1c611bbd | 1987 | mf_nr_ar3 = 0; |
7bc95e2e | 1988 | iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD); |
1989 | sync_time = GetCountSspClk() & 0xfffffff8; | |
1c611bbd | 1990 | sync_cycles = 65536; // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces). |
1991 | nt_attacked = 0; | |
1992 | nt = 0; | |
6a1f2d82 | 1993 | par[0] = 0; |
1c611bbd | 1994 | } |
1995 | else { | |
1996 | // we were unsuccessful on a previous call. Try another READER nonce (first 3 parity bits remain the same) | |
1c611bbd | 1997 | mf_nr_ar3++; |
1998 | mf_nr_ar[3] = mf_nr_ar3; | |
6a1f2d82 | 1999 | par[0] = par_low; |
1c611bbd | 2000 | } |
e30c654b | 2001 | |
15c4dc5a | 2002 | LED_A_ON(); |
2003 | LED_B_OFF(); | |
2004 | LED_C_OFF(); | |
1c611bbd | 2005 | |
7bc95e2e | 2006 | |
1c611bbd | 2007 | for(uint16_t i = 0; TRUE; i++) { |
2008 | ||
2009 | WDT_HIT(); | |
e30c654b | 2010 | |
1c611bbd | 2011 | // Test if the action was cancelled |
2012 | if(BUTTON_PRESS()) { | |
2013 | break; | |
2014 | } | |
2015 | ||
2016 | LED_C_ON(); | |
e30c654b | 2017 | |
1c611bbd | 2018 | if(!iso14443a_select_card(uid, NULL, &cuid)) { |
9492e0b0 | 2019 | if (MF_DBGLEVEL >= 1) Dbprintf("Mifare: Can't select card"); |
1c611bbd | 2020 | continue; |
2021 | } | |
2022 | ||
9492e0b0 | 2023 | sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles; |
1c611bbd | 2024 | catch_up_cycles = 0; |
2025 | ||
2026 | // if we missed the sync time already, advance to the next nonce repeat | |
7bc95e2e | 2027 | while(GetCountSspClk() > sync_time) { |
9492e0b0 | 2028 | sync_time = (sync_time & 0xfffffff8) + sync_cycles; |
1c611bbd | 2029 | } |
e30c654b | 2030 | |
9492e0b0 | 2031 | // Transmit MIFARE_CLASSIC_AUTH at synctime. Should result in returning the same tag nonce (== nt_attacked) |
2032 | ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time); | |
f89c7050 | 2033 | |
1c611bbd | 2034 | // Receive the (4 Byte) "random" nonce |
6a1f2d82 | 2035 | if (!ReaderReceive(receivedAnswer, receivedAnswerPar)) { |
9492e0b0 | 2036 | if (MF_DBGLEVEL >= 1) Dbprintf("Mifare: Couldn't receive tag nonce"); |
1c611bbd | 2037 | continue; |
2038 | } | |
2039 | ||
1c611bbd | 2040 | previous_nt = nt; |
2041 | nt = bytes_to_num(receivedAnswer, 4); | |
2042 | ||
2043 | // Transmit reader nonce with fake par | |
9492e0b0 | 2044 | ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par, NULL); |
1c611bbd | 2045 | |
2046 | if (first_try && previous_nt && !nt_attacked) { // we didn't calibrate our clock yet | |
2047 | int nt_distance = dist_nt(previous_nt, nt); | |
2048 | if (nt_distance == 0) { | |
2049 | nt_attacked = nt; | |
2050 | } | |
2051 | else { | |
2052 | if (nt_distance == -99999) { // invalid nonce received, try again | |
2053 | continue; | |
2054 | } | |
2055 | sync_cycles = (sync_cycles - nt_distance); | |
9492e0b0 | 2056 | if (MF_DBGLEVEL >= 3) Dbprintf("calibrating in cycle %d. nt_distance=%d, Sync_cycles: %d\n", i, nt_distance, sync_cycles); |
1c611bbd | 2057 | continue; |
2058 | } | |
2059 | } | |
2060 | ||
2061 | if ((nt != nt_attacked) && nt_attacked) { // we somehow lost sync. Try to catch up again... | |
2062 | catch_up_cycles = -dist_nt(nt_attacked, nt); | |
2063 | if (catch_up_cycles == 99999) { // invalid nonce received. Don't resync on that one. | |
2064 | catch_up_cycles = 0; | |
2065 | continue; | |
2066 | } | |
2067 | if (catch_up_cycles == last_catch_up) { | |
2068 | consecutive_resyncs++; | |
2069 | } | |
2070 | else { | |
2071 | last_catch_up = catch_up_cycles; | |
2072 | consecutive_resyncs = 0; | |
2073 | } | |
2074 | if (consecutive_resyncs < 3) { | |
9492e0b0 | 2075 | if (MF_DBGLEVEL >= 3) Dbprintf("Lost sync in cycle %d. nt_distance=%d. Consecutive Resyncs = %d. Trying one time catch up...\n", i, -catch_up_cycles, consecutive_resyncs); |
1c611bbd | 2076 | } |
2077 | else { | |
2078 | sync_cycles = sync_cycles + catch_up_cycles; | |
9492e0b0 | 2079 | if (MF_DBGLEVEL >= 3) Dbprintf("Lost sync in cycle %d for the fourth time consecutively (nt_distance = %d). Adjusting sync_cycles to %d.\n", i, -catch_up_cycles, sync_cycles); |
1c611bbd | 2080 | } |
2081 | continue; | |
2082 | } | |
2083 | ||
2084 | consecutive_resyncs = 0; | |
2085 | ||
2086 | // Receive answer. This will be a 4 Bit NACK when the 8 parity bits are OK after decoding | |
6a1f2d82 | 2087 | if (ReaderReceive(receivedAnswer, receivedAnswerPar)) |
1c611bbd | 2088 | { |
9492e0b0 | 2089 | catch_up_cycles = 8; // the PRNG is delayed by 8 cycles due to the NAC (4Bits = 0x05 encrypted) transfer |
1c611bbd | 2090 | |
2091 | if (nt_diff == 0) | |
2092 | { | |
6a1f2d82 | 2093 | par_low = par[0] & 0xE0; // there is no need to check all parities for other nt_diff. Parity Bits for mf_nr_ar[0..2] won't change |
1c611bbd | 2094 | } |
2095 | ||
2096 | led_on = !led_on; | |
2097 | if(led_on) LED_B_ON(); else LED_B_OFF(); | |
2098 | ||
6a1f2d82 | 2099 | par_list[nt_diff] = SwapBits(par[0], 8); |
1c611bbd | 2100 | ks_list[nt_diff] = receivedAnswer[0] ^ 0x05; |
2101 | ||
2102 | // Test if the information is complete | |
2103 | if (nt_diff == 0x07) { | |
2104 | isOK = 1; | |
2105 | break; | |
2106 | } | |
2107 | ||
2108 | nt_diff = (nt_diff + 1) & 0x07; | |
2109 | mf_nr_ar[3] = (mf_nr_ar[3] & 0x1F) | (nt_diff << 5); | |
6a1f2d82 | 2110 | par[0] = par_low; |
1c611bbd | 2111 | } else { |
2112 | if (nt_diff == 0 && first_try) | |
2113 | { | |
6a1f2d82 | 2114 | par[0]++; |
1c611bbd | 2115 | } else { |
6a1f2d82 | 2116 | par[0] = ((par[0] & 0x1F) + 1) | par_low; |
1c611bbd | 2117 | } |
2118 | } | |
2119 | } | |
2120 | ||
1c611bbd | 2121 | |
2122 | mf_nr_ar[3] &= 0x1F; | |
2123 | ||
2124 | byte_t buf[28]; | |
2125 | memcpy(buf + 0, uid, 4); | |
2126 | num_to_bytes(nt, 4, buf + 4); | |
2127 | memcpy(buf + 8, par_list, 8); | |
2128 | memcpy(buf + 16, ks_list, 8); | |
2129 | memcpy(buf + 24, mf_nr_ar, 4); | |
2130 | ||
2131 | cmd_send(CMD_ACK,isOK,0,0,buf,28); | |
2132 | ||
2133 | // Thats it... | |
2134 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
2135 | LEDsoff(); | |
7bc95e2e | 2136 | |
2137 | iso14a_set_tracing(FALSE); | |
20f9a2a1 | 2138 | } |
1c611bbd | 2139 | |
d2f487af | 2140 | /** |
2141 | *MIFARE 1K simulate. | |
2142 | * | |
2143 | *@param flags : | |
2144 | * FLAG_INTERACTIVE - In interactive mode, we are expected to finish the operation with an ACK | |
2145 | * 4B_FLAG_UID_IN_DATA - means that there is a 4-byte UID in the data-section, we're expected to use that | |
2146 | * 7B_FLAG_UID_IN_DATA - means that there is a 7-byte UID in the data-section, we're expected to use that | |
2147 | * FLAG_NR_AR_ATTACK - means we should collect NR_AR responses for bruteforcing later | |
2148 | *@param exitAfterNReads, exit simulation after n blocks have been read, 0 is inifite | |
2149 | */ | |
2150 | void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *datain) | |
20f9a2a1 | 2151 | { |
50193c1e | 2152 | int cardSTATE = MFEMUL_NOFIELD; |
8556b852 | 2153 | int _7BUID = 0; |
9ca155ba | 2154 | int vHf = 0; // in mV |
8f51ddb0 | 2155 | int res; |
0a39986e M |
2156 | uint32_t selTimer = 0; |
2157 | uint32_t authTimer = 0; | |
6a1f2d82 | 2158 | uint16_t len = 0; |
8f51ddb0 | 2159 | uint8_t cardWRBL = 0; |
9ca155ba M |
2160 | uint8_t cardAUTHSC = 0; |
2161 | uint8_t cardAUTHKEY = 0xff; // no authentication | |
51969283 | 2162 | uint32_t cardRr = 0; |
9ca155ba | 2163 | uint32_t cuid = 0; |
d2f487af | 2164 | //uint32_t rn_enc = 0; |
51969283 | 2165 | uint32_t ans = 0; |
0014cb46 M |
2166 | uint32_t cardINTREG = 0; |
2167 | uint8_t cardINTBLOCK = 0; | |
9ca155ba M |
2168 | struct Crypto1State mpcs = {0, 0}; |
2169 | struct Crypto1State *pcs; | |
2170 | pcs = &mpcs; | |
d2f487af | 2171 | uint32_t numReads = 0;//Counts numer of times reader read a block |
6a1f2d82 | 2172 | uint8_t* receivedCmd = get_bigbufptr_recvcmdbuf(); |
2173 | uint8_t* receivedCmd_par = receivedCmd + MAX_FRAME_SIZE; | |
2174 | uint8_t* response = get_bigbufptr_recvrespbuf(); | |
2175 | uint8_t* response_par = response + MAX_FRAME_SIZE; | |
9ca155ba | 2176 | |
d2f487af | 2177 | uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID |
2178 | uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; | |
2179 | uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; // !!! | |
2180 | uint8_t rSAK[] = {0x08, 0xb6, 0xdd}; | |
2181 | uint8_t rSAK1[] = {0x04, 0xda, 0x17}; | |
9ca155ba | 2182 | |
d2f487af | 2183 | uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04}; |
2184 | uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00}; | |
7bc95e2e | 2185 | |
d2f487af | 2186 | //Here, we collect UID,NT,AR,NR,UID2,NT2,AR2,NR2 |
2187 | // This can be used in a reader-only attack. | |
2188 | // (it can also be retrieved via 'hf 14a list', but hey... | |
2189 | uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0}; | |
2190 | uint8_t ar_nr_collected = 0; | |
0014cb46 | 2191 | |
0a39986e | 2192 | // clear trace |
7bc95e2e | 2193 | iso14a_clear_trace(); |
2194 | iso14a_set_tracing(TRUE); | |
51969283 | 2195 | |
7bc95e2e | 2196 | // Authenticate response - nonce |
51969283 | 2197 | uint32_t nonce = bytes_to_num(rAUTH_NT, 4); |
7bc95e2e | 2198 | |
d2f487af | 2199 | //-- Determine the UID |
2200 | // Can be set from emulator memory, incoming data | |
2201 | // and can be 7 or 4 bytes long | |
7bc95e2e | 2202 | if (flags & FLAG_4B_UID_IN_DATA) |
d2f487af | 2203 | { |
2204 | // 4B uid comes from data-portion of packet | |
2205 | memcpy(rUIDBCC1,datain,4); | |
8556b852 | 2206 | rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; |
8556b852 | 2207 | |
7bc95e2e | 2208 | } else if (flags & FLAG_7B_UID_IN_DATA) { |
d2f487af | 2209 | // 7B uid comes from data-portion of packet |
2210 | memcpy(&rUIDBCC1[1],datain,3); | |
2211 | memcpy(rUIDBCC2, datain+3, 4); | |
2212 | _7BUID = true; | |
7bc95e2e | 2213 | } else { |
d2f487af | 2214 | // get UID from emul memory |
2215 | emlGetMemBt(receivedCmd, 7, 1); | |
2216 | _7BUID = !(receivedCmd[0] == 0x00); | |
2217 | if (!_7BUID) { // ---------- 4BUID | |
2218 | emlGetMemBt(rUIDBCC1, 0, 4); | |
2219 | } else { // ---------- 7BUID | |
2220 | emlGetMemBt(&rUIDBCC1[1], 0, 3); | |
2221 | emlGetMemBt(rUIDBCC2, 3, 4); | |
2222 | } | |
2223 | } | |
7bc95e2e | 2224 | |
d2f487af | 2225 | /* |
2226 | * Regardless of what method was used to set the UID, set fifth byte and modify | |
2227 | * the ATQA for 4 or 7-byte UID | |
2228 | */ | |
d2f487af | 2229 | rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; |
7bc95e2e | 2230 | if (_7BUID) { |
d2f487af | 2231 | rATQA[0] = 0x44; |
8556b852 | 2232 | rUIDBCC1[0] = 0x88; |
8556b852 M |
2233 | rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3]; |
2234 | } | |
2235 | ||
9ca155ba | 2236 | // We need to listen to the high-frequency, peak-detected path. |
7bc95e2e | 2237 | iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN); |
9ca155ba | 2238 | |
9ca155ba | 2239 | |
d2f487af | 2240 | if (MF_DBGLEVEL >= 1) { |
2241 | if (!_7BUID) { | |
b03c0f2d | 2242 | Dbprintf("4B UID: %02x%02x%02x%02x", |
2243 | rUIDBCC1[0], rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3]); | |
7bc95e2e | 2244 | } else { |
b03c0f2d | 2245 | Dbprintf("7B UID: (%02x)%02x%02x%02x%02x%02x%02x%02x", |
2246 | rUIDBCC1[0], rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3], | |
2247 | rUIDBCC2[0], rUIDBCC2[1] ,rUIDBCC2[2], rUIDBCC2[3]); | |
d2f487af | 2248 | } |
2249 | } | |
7bc95e2e | 2250 | |
2251 | bool finished = FALSE; | |
d2f487af | 2252 | while (!BUTTON_PRESS() && !finished) { |
9ca155ba | 2253 | WDT_HIT(); |
9ca155ba M |
2254 | |
2255 | // find reader field | |
2256 | // Vref = 3300mV, and an 10:1 voltage divider on the input | |
2257 | // can measure voltages up to 33000 mV | |
2258 | if (cardSTATE == MFEMUL_NOFIELD) { | |
2259 | vHf = (33000 * AvgAdc(ADC_CHAN_HF)) >> 10; | |
2260 | if (vHf > MF_MINFIELDV) { | |
0014cb46 | 2261 | cardSTATE_TO_IDLE(); |
9ca155ba M |
2262 | LED_A_ON(); |
2263 | } | |
2264 | } | |
d2f487af | 2265 | if(cardSTATE == MFEMUL_NOFIELD) continue; |
9ca155ba | 2266 | |
d2f487af | 2267 | //Now, get data |
2268 | ||
6a1f2d82 | 2269 | res = EmGetCmd(receivedCmd, &len, receivedCmd_par); |
d2f487af | 2270 | if (res == 2) { //Field is off! |
2271 | cardSTATE = MFEMUL_NOFIELD; | |
2272 | LEDsoff(); | |
2273 | continue; | |
7bc95e2e | 2274 | } else if (res == 1) { |
2275 | break; //return value 1 means button press | |
2276 | } | |
2277 | ||
d2f487af | 2278 | // REQ or WUP request in ANY state and WUP in HALTED state |
2279 | if (len == 1 && ((receivedCmd[0] == 0x26 && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == 0x52)) { | |
2280 | selTimer = GetTickCount(); | |
2281 | EmSendCmdEx(rATQA, sizeof(rATQA), (receivedCmd[0] == 0x52)); | |
2282 | cardSTATE = MFEMUL_SELECT1; | |
2283 | ||
2284 | // init crypto block | |
2285 | LED_B_OFF(); | |
2286 | LED_C_OFF(); | |
2287 | crypto1_destroy(pcs); | |
2288 | cardAUTHKEY = 0xff; | |
2289 | continue; | |
0a39986e | 2290 | } |
7bc95e2e | 2291 | |
50193c1e | 2292 | switch (cardSTATE) { |
d2f487af | 2293 | case MFEMUL_NOFIELD: |
2294 | case MFEMUL_HALTED: | |
50193c1e | 2295 | case MFEMUL_IDLE:{ |
6a1f2d82 | 2296 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
50193c1e M |
2297 | break; |
2298 | } | |
2299 | case MFEMUL_SELECT1:{ | |
9ca155ba M |
2300 | // select all |
2301 | if (len == 2 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x20)) { | |
d2f487af | 2302 | if (MF_DBGLEVEL >= 4) Dbprintf("SELECT ALL received"); |
9ca155ba | 2303 | EmSendCmd(rUIDBCC1, sizeof(rUIDBCC1)); |
0014cb46 | 2304 | break; |
9ca155ba M |
2305 | } |
2306 | ||
d2f487af | 2307 | if (MF_DBGLEVEL >= 4 && len == 9 && receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 ) |
2308 | { | |
2309 | Dbprintf("SELECT %02x%02x%02x%02x received",receivedCmd[2],receivedCmd[3],receivedCmd[4],receivedCmd[5]); | |
2310 | } | |
9ca155ba | 2311 | // select card |
0a39986e M |
2312 | if (len == 9 && |
2313 | (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) { | |
bfb6a143 | 2314 | EmSendCmd(_7BUID?rSAK1:rSAK, _7BUID?sizeof(rSAK1):sizeof(rSAK)); |
9ca155ba | 2315 | cuid = bytes_to_num(rUIDBCC1, 4); |
8556b852 M |
2316 | if (!_7BUID) { |
2317 | cardSTATE = MFEMUL_WORK; | |
0014cb46 M |
2318 | LED_B_ON(); |
2319 | if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol1 time: %d", GetTickCount() - selTimer); | |
2320 | break; | |
8556b852 M |
2321 | } else { |
2322 | cardSTATE = MFEMUL_SELECT2; | |
8556b852 | 2323 | } |
9ca155ba | 2324 | } |
50193c1e M |
2325 | break; |
2326 | } | |
d2f487af | 2327 | case MFEMUL_AUTH1:{ |
2328 | if( len != 8) | |
2329 | { | |
2330 | cardSTATE_TO_IDLE(); | |
6a1f2d82 | 2331 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
d2f487af | 2332 | break; |
2333 | } | |
2334 | uint32_t ar = bytes_to_num(receivedCmd, 4); | |
6a1f2d82 | 2335 | uint32_t nr = bytes_to_num(&receivedCmd[4], 4); |
d2f487af | 2336 | |
2337 | //Collect AR/NR | |
2338 | if(ar_nr_collected < 2){ | |
273b57a7 | 2339 | if(ar_nr_responses[2] != ar) |
2340 | {// Avoid duplicates... probably not necessary, ar should vary. | |
d2f487af | 2341 | ar_nr_responses[ar_nr_collected*4] = cuid; |
2342 | ar_nr_responses[ar_nr_collected*4+1] = nonce; | |
2343 | ar_nr_responses[ar_nr_collected*4+2] = ar; | |
2344 | ar_nr_responses[ar_nr_collected*4+3] = nr; | |
273b57a7 | 2345 | ar_nr_collected++; |
d2f487af | 2346 | } |
2347 | } | |
2348 | ||
2349 | // --- crypto | |
2350 | crypto1_word(pcs, ar , 1); | |
2351 | cardRr = nr ^ crypto1_word(pcs, 0, 0); | |
2352 | ||
2353 | // test if auth OK | |
2354 | if (cardRr != prng_successor(nonce, 64)){ | |
b03c0f2d | 2355 | if (MF_DBGLEVEL >= 2) Dbprintf("AUTH FAILED for sector %d with key %c. cardRr=%08x, succ=%08x", |
2356 | cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B', | |
2357 | cardRr, prng_successor(nonce, 64)); | |
7bc95e2e | 2358 | // Shouldn't we respond anything here? |
d2f487af | 2359 | // Right now, we don't nack or anything, which causes the |
2360 | // reader to do a WUPA after a while. /Martin | |
b03c0f2d | 2361 | // -- which is the correct response. /piwi |
d2f487af | 2362 | cardSTATE_TO_IDLE(); |
6a1f2d82 | 2363 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
d2f487af | 2364 | break; |
2365 | } | |
2366 | ||
2367 | ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0); | |
2368 | ||
2369 | num_to_bytes(ans, 4, rAUTH_AT); | |
2370 | // --- crypto | |
2371 | EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); | |
2372 | LED_C_ON(); | |
2373 | cardSTATE = MFEMUL_WORK; | |
b03c0f2d | 2374 | if (MF_DBGLEVEL >= 4) Dbprintf("AUTH COMPLETED for sector %d with key %c. time=%d", |
2375 | cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B', | |
2376 | GetTickCount() - authTimer); | |
d2f487af | 2377 | break; |
2378 | } | |
50193c1e | 2379 | case MFEMUL_SELECT2:{ |
7bc95e2e | 2380 | if (!len) { |
6a1f2d82 | 2381 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 2382 | break; |
2383 | } | |
8556b852 | 2384 | if (len == 2 && (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x20)) { |
9ca155ba | 2385 | EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2)); |
8556b852 M |
2386 | break; |
2387 | } | |
9ca155ba | 2388 | |
8556b852 M |
2389 | // select 2 card |
2390 | if (len == 9 && | |
2391 | (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC2, 4) == 0)) { | |
2392 | EmSendCmd(rSAK, sizeof(rSAK)); | |
8556b852 M |
2393 | cuid = bytes_to_num(rUIDBCC2, 4); |
2394 | cardSTATE = MFEMUL_WORK; | |
2395 | LED_B_ON(); | |
0014cb46 | 2396 | if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol2 time: %d", GetTickCount() - selTimer); |
8556b852 M |
2397 | break; |
2398 | } | |
0014cb46 M |
2399 | |
2400 | // i guess there is a command). go into the work state. | |
7bc95e2e | 2401 | if (len != 4) { |
6a1f2d82 | 2402 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 2403 | break; |
2404 | } | |
0014cb46 | 2405 | cardSTATE = MFEMUL_WORK; |
d2f487af | 2406 | //goto lbWORK; |
2407 | //intentional fall-through to the next case-stmt | |
50193c1e | 2408 | } |
51969283 | 2409 | |
7bc95e2e | 2410 | case MFEMUL_WORK:{ |
2411 | if (len == 0) { | |
6a1f2d82 | 2412 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 2413 | break; |
2414 | } | |
2415 | ||
d2f487af | 2416 | bool encrypted_data = (cardAUTHKEY != 0xFF) ; |
2417 | ||
7bc95e2e | 2418 | if(encrypted_data) { |
51969283 M |
2419 | // decrypt seqence |
2420 | mf_crypto1_decrypt(pcs, receivedCmd, len); | |
d2f487af | 2421 | } |
7bc95e2e | 2422 | |
d2f487af | 2423 | if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) { |
2424 | authTimer = GetTickCount(); | |
2425 | cardAUTHSC = receivedCmd[1] / 4; // received block num | |
2426 | cardAUTHKEY = receivedCmd[0] - 0x60; | |
2427 | crypto1_destroy(pcs);//Added by martin | |
2428 | crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY)); | |
51969283 | 2429 | |
d2f487af | 2430 | if (!encrypted_data) { // first authentication |
b03c0f2d | 2431 | if (MF_DBGLEVEL >= 4) Dbprintf("Reader authenticating for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY ); |
51969283 | 2432 | |
d2f487af | 2433 | crypto1_word(pcs, cuid ^ nonce, 0);//Update crypto state |
2434 | num_to_bytes(nonce, 4, rAUTH_AT); // Send nonce | |
7bc95e2e | 2435 | } else { // nested authentication |
b03c0f2d | 2436 | if (MF_DBGLEVEL >= 4) Dbprintf("Reader doing nested authentication for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY ); |
7bc95e2e | 2437 | ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); |
d2f487af | 2438 | num_to_bytes(ans, 4, rAUTH_AT); |
2439 | } | |
2440 | EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); | |
2441 | //Dbprintf("Sending rAUTH %02x%02x%02x%02x", rAUTH_AT[0],rAUTH_AT[1],rAUTH_AT[2],rAUTH_AT[3]); | |
2442 | cardSTATE = MFEMUL_AUTH1; | |
2443 | break; | |
51969283 | 2444 | } |
7bc95e2e | 2445 | |
8f51ddb0 M |
2446 | // rule 13 of 7.5.3. in ISO 14443-4. chaining shall be continued |
2447 | // BUT... ACK --> NACK | |
2448 | if (len == 1 && receivedCmd[0] == CARD_ACK) { | |
2449 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); | |
2450 | break; | |
2451 | } | |
2452 | ||
2453 | // rule 12 of 7.5.3. in ISO 14443-4. R(NAK) --> R(ACK) | |
2454 | if (len == 1 && receivedCmd[0] == CARD_NACK_NA) { | |
2455 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); | |
2456 | break; | |
0a39986e M |
2457 | } |
2458 | ||
7bc95e2e | 2459 | if(len != 4) { |
6a1f2d82 | 2460 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 2461 | break; |
2462 | } | |
d2f487af | 2463 | |
2464 | if(receivedCmd[0] == 0x30 // read block | |
2465 | || receivedCmd[0] == 0xA0 // write block | |
b03c0f2d | 2466 | || receivedCmd[0] == 0xC0 // inc |
2467 | || receivedCmd[0] == 0xC1 // dec | |
2468 | || receivedCmd[0] == 0xC2 // restore | |
7bc95e2e | 2469 | || receivedCmd[0] == 0xB0) { // transfer |
2470 | if (receivedCmd[1] >= 16 * 4) { | |
d2f487af | 2471 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); |
2472 | if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02) on out of range block: %d (0x%02x), nacking",receivedCmd[0],receivedCmd[1],receivedCmd[1]); | |
2473 | break; | |
2474 | } | |
2475 | ||
7bc95e2e | 2476 | if (receivedCmd[1] / 4 != cardAUTHSC) { |
8f51ddb0 | 2477 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); |
d2f487af | 2478 | if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02) on block (0x%02x) not authenticated for (0x%02x), nacking",receivedCmd[0],receivedCmd[1],cardAUTHSC); |
8f51ddb0 M |
2479 | break; |
2480 | } | |
d2f487af | 2481 | } |
2482 | // read block | |
2483 | if (receivedCmd[0] == 0x30) { | |
b03c0f2d | 2484 | if (MF_DBGLEVEL >= 4) { |
d2f487af | 2485 | Dbprintf("Reader reading block %d (0x%02x)",receivedCmd[1],receivedCmd[1]); |
2486 | } | |
8f51ddb0 M |
2487 | emlGetMem(response, receivedCmd[1], 1); |
2488 | AppendCrc14443a(response, 16); | |
6a1f2d82 | 2489 | mf_crypto1_encrypt(pcs, response, 18, response_par); |
2490 | EmSendCmdPar(response, 18, response_par); | |
d2f487af | 2491 | numReads++; |
7bc95e2e | 2492 | if(exitAfterNReads > 0 && numReads == exitAfterNReads) { |
d2f487af | 2493 | Dbprintf("%d reads done, exiting", numReads); |
2494 | finished = true; | |
2495 | } | |
0a39986e M |
2496 | break; |
2497 | } | |
0a39986e | 2498 | // write block |
d2f487af | 2499 | if (receivedCmd[0] == 0xA0) { |
b03c0f2d | 2500 | if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0xA0 write block %d (%02x)",receivedCmd[1],receivedCmd[1]); |
8f51ddb0 | 2501 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); |
8f51ddb0 M |
2502 | cardSTATE = MFEMUL_WRITEBL2; |
2503 | cardWRBL = receivedCmd[1]; | |
0a39986e | 2504 | break; |
7bc95e2e | 2505 | } |
0014cb46 | 2506 | // increment, decrement, restore |
d2f487af | 2507 | if (receivedCmd[0] == 0xC0 || receivedCmd[0] == 0xC1 || receivedCmd[0] == 0xC2) { |
b03c0f2d | 2508 | if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]); |
d2f487af | 2509 | if (emlCheckValBl(receivedCmd[1])) { |
2510 | if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate on block, but emlCheckValBl failed, nacking"); | |
0014cb46 M |
2511 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); |
2512 | break; | |
2513 | } | |
2514 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); | |
2515 | if (receivedCmd[0] == 0xC1) | |
2516 | cardSTATE = MFEMUL_INTREG_INC; | |
2517 | if (receivedCmd[0] == 0xC0) | |
2518 | cardSTATE = MFEMUL_INTREG_DEC; | |
2519 | if (receivedCmd[0] == 0xC2) | |
2520 | cardSTATE = MFEMUL_INTREG_REST; | |
2521 | cardWRBL = receivedCmd[1]; | |
0014cb46 M |
2522 | break; |
2523 | } | |
0014cb46 | 2524 | // transfer |
d2f487af | 2525 | if (receivedCmd[0] == 0xB0) { |
b03c0f2d | 2526 | if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x transfer block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]); |
0014cb46 M |
2527 | if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd[1])) |
2528 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); | |
2529 | else | |
2530 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); | |
0014cb46 M |
2531 | break; |
2532 | } | |
9ca155ba | 2533 | // halt |
d2f487af | 2534 | if (receivedCmd[0] == 0x50 && receivedCmd[1] == 0x00) { |
9ca155ba | 2535 | LED_B_OFF(); |
0a39986e | 2536 | LED_C_OFF(); |
0014cb46 M |
2537 | cardSTATE = MFEMUL_HALTED; |
2538 | if (MF_DBGLEVEL >= 4) Dbprintf("--> HALTED. Selected time: %d ms", GetTickCount() - selTimer); | |
6a1f2d82 | 2539 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
0a39986e | 2540 | break; |
9ca155ba | 2541 | } |
d2f487af | 2542 | // RATS |
2543 | if (receivedCmd[0] == 0xe0) {//RATS | |
8f51ddb0 M |
2544 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); |
2545 | break; | |
2546 | } | |
d2f487af | 2547 | // command not allowed |
2548 | if (MF_DBGLEVEL >= 4) Dbprintf("Received command not allowed, nacking"); | |
2549 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); | |
51969283 | 2550 | break; |
8f51ddb0 M |
2551 | } |
2552 | case MFEMUL_WRITEBL2:{ | |
2553 | if (len == 18){ | |
2554 | mf_crypto1_decrypt(pcs, receivedCmd, len); | |
2555 | emlSetMem(receivedCmd, cardWRBL, 1); | |
2556 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); | |
2557 | cardSTATE = MFEMUL_WORK; | |
51969283 | 2558 | } else { |
0014cb46 | 2559 | cardSTATE_TO_IDLE(); |
6a1f2d82 | 2560 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
8f51ddb0 | 2561 | } |
8f51ddb0 | 2562 | break; |
50193c1e | 2563 | } |
0014cb46 M |
2564 | |
2565 | case MFEMUL_INTREG_INC:{ | |
2566 | mf_crypto1_decrypt(pcs, receivedCmd, len); | |
2567 | memcpy(&ans, receivedCmd, 4); | |
2568 | if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) { | |
2569 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); | |
2570 | cardSTATE_TO_IDLE(); | |
2571 | break; | |
7bc95e2e | 2572 | } |
6a1f2d82 | 2573 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
0014cb46 M |
2574 | cardINTREG = cardINTREG + ans; |
2575 | cardSTATE = MFEMUL_WORK; | |
2576 | break; | |
2577 | } | |
2578 | case MFEMUL_INTREG_DEC:{ | |
2579 | mf_crypto1_decrypt(pcs, receivedCmd, len); | |
2580 | memcpy(&ans, receivedCmd, 4); | |
2581 | if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) { | |
2582 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); | |
2583 | cardSTATE_TO_IDLE(); | |
2584 | break; | |
2585 | } | |
6a1f2d82 | 2586 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
0014cb46 M |
2587 | cardINTREG = cardINTREG - ans; |
2588 | cardSTATE = MFEMUL_WORK; | |
2589 | break; | |
2590 | } | |
2591 | case MFEMUL_INTREG_REST:{ | |
2592 | mf_crypto1_decrypt(pcs, receivedCmd, len); | |
2593 | memcpy(&ans, receivedCmd, 4); | |
2594 | if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) { | |
2595 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); | |
2596 | cardSTATE_TO_IDLE(); | |
2597 | break; | |
2598 | } | |
6a1f2d82 | 2599 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
0014cb46 M |
2600 | cardSTATE = MFEMUL_WORK; |
2601 | break; | |
2602 | } | |
50193c1e | 2603 | } |
50193c1e M |
2604 | } |
2605 | ||
9ca155ba M |
2606 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); |
2607 | LEDsoff(); | |
2608 | ||
d2f487af | 2609 | if(flags & FLAG_INTERACTIVE)// Interactive mode flag, means we need to send ACK |
2610 | { | |
2611 | //May just aswell send the collected ar_nr in the response aswell | |
2612 | cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,0,0,&ar_nr_responses,ar_nr_collected*4*4); | |
2613 | } | |
d714d3ef | 2614 | |
d2f487af | 2615 | if(flags & FLAG_NR_AR_ATTACK) |
2616 | { | |
7bc95e2e | 2617 | if(ar_nr_collected > 1) { |
d2f487af | 2618 | Dbprintf("Collected two pairs of AR/NR which can be used to extract keys from reader:"); |
d714d3ef | 2619 | Dbprintf("../tools/mfkey/mfkey32 %08x %08x %08x %08x %08x %08x", |
d2f487af | 2620 | ar_nr_responses[0], // UID |
2621 | ar_nr_responses[1], //NT | |
2622 | ar_nr_responses[2], //AR1 | |
2623 | ar_nr_responses[3], //NR1 | |
2624 | ar_nr_responses[6], //AR2 | |
2625 | ar_nr_responses[7] //NR2 | |
2626 | ); | |
7bc95e2e | 2627 | } else { |
d2f487af | 2628 | Dbprintf("Failed to obtain two AR/NR pairs!"); |
7bc95e2e | 2629 | if(ar_nr_collected >0) { |
d714d3ef | 2630 | Dbprintf("Only got these: UID=%08x, nonce=%08x, AR1=%08x, NR1=%08x", |
d2f487af | 2631 | ar_nr_responses[0], // UID |
2632 | ar_nr_responses[1], //NT | |
2633 | ar_nr_responses[2], //AR1 | |
2634 | ar_nr_responses[3] //NR1 | |
2635 | ); | |
2636 | } | |
2637 | } | |
2638 | } | |
0014cb46 | 2639 | if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, traceLen); |
15c4dc5a | 2640 | } |
b62a5a84 | 2641 | |
d2f487af | 2642 | |
2643 | ||
b62a5a84 M |
2644 | //----------------------------------------------------------------------------- |
2645 | // MIFARE sniffer. | |
2646 | // | |
2647 | //----------------------------------------------------------------------------- | |
5cd9ec01 M |
2648 | void RAMFUNC SniffMifare(uint8_t param) { |
2649 | // param: | |
2650 | // bit 0 - trigger from first card answer | |
2651 | // bit 1 - trigger from first reader 7-bit request | |
39864b0b M |
2652 | |
2653 | // C(red) A(yellow) B(green) | |
b62a5a84 M |
2654 | LEDsoff(); |
2655 | // init trace buffer | |
991f13f2 | 2656 | iso14a_clear_trace(); |
2657 | iso14a_set_tracing(TRUE); | |
b62a5a84 | 2658 | |
b62a5a84 M |
2659 | // The command (reader -> tag) that we're receiving. |
2660 | // The length of a received command will in most cases be no more than 18 bytes. | |
2661 | // So 32 should be enough! | |
2662 | uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET); | |
6a1f2d82 | 2663 | uint8_t *receivedCmdPar = ((uint8_t *)BigBuf) + RECV_CMD_PAR_OFFSET; |
b62a5a84 | 2664 | // The response (tag -> reader) that we're receiving. |
6a1f2d82 | 2665 | uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET); |
2666 | uint8_t *receivedResponsePar = ((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET; | |
b62a5a84 M |
2667 | |
2668 | // As we receive stuff, we copy it from receivedCmd or receivedResponse | |
2669 | // into trace, along with its length and other annotations. | |
2670 | //uint8_t *trace = (uint8_t *)BigBuf; | |
2671 | ||
2672 | // The DMA buffer, used to stream samples from the FPGA | |
7bc95e2e | 2673 | uint8_t *dmaBuf = ((uint8_t *)BigBuf) + DMA_BUFFER_OFFSET; |
2674 | uint8_t *data = dmaBuf; | |
2675 | uint8_t previous_data = 0; | |
5cd9ec01 M |
2676 | int maxDataLen = 0; |
2677 | int dataLen = 0; | |
7bc95e2e | 2678 | bool ReaderIsActive = FALSE; |
2679 | bool TagIsActive = FALSE; | |
2680 | ||
2681 | iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER); | |
b62a5a84 M |
2682 | |
2683 | // Set up the demodulator for tag -> reader responses. | |
6a1f2d82 | 2684 | DemodInit(receivedResponse, receivedResponsePar); |
b62a5a84 M |
2685 | |
2686 | // Set up the demodulator for the reader -> tag commands | |
6a1f2d82 | 2687 | UartInit(receivedCmd, receivedCmdPar); |
b62a5a84 M |
2688 | |
2689 | // Setup for the DMA. | |
7bc95e2e | 2690 | FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); // set transfer address and number of bytes. Start transfer. |
b62a5a84 | 2691 | |
b62a5a84 | 2692 | LED_D_OFF(); |
39864b0b M |
2693 | |
2694 | // init sniffer | |
2695 | MfSniffInit(); | |
b62a5a84 | 2696 | |
b62a5a84 | 2697 | // And now we loop, receiving samples. |
7bc95e2e | 2698 | for(uint32_t sniffCounter = 0; TRUE; ) { |
2699 | ||
5cd9ec01 M |
2700 | if(BUTTON_PRESS()) { |
2701 | DbpString("cancelled by button"); | |
7bc95e2e | 2702 | break; |
5cd9ec01 M |
2703 | } |
2704 | ||
b62a5a84 M |
2705 | LED_A_ON(); |
2706 | WDT_HIT(); | |
39864b0b | 2707 | |
7bc95e2e | 2708 | if ((sniffCounter & 0x0000FFFF) == 0) { // from time to time |
2709 | // check if a transaction is completed (timeout after 2000ms). | |
2710 | // if yes, stop the DMA transfer and send what we have so far to the client | |
2711 | if (MfSniffSend(2000)) { | |
2712 | // Reset everything - we missed some sniffed data anyway while the DMA was stopped | |
2713 | sniffCounter = 0; | |
2714 | data = dmaBuf; | |
2715 | maxDataLen = 0; | |
2716 | ReaderIsActive = FALSE; | |
2717 | TagIsActive = FALSE; | |
2718 | FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); // set transfer address and number of bytes. Start transfer. | |
39864b0b | 2719 | } |
39864b0b | 2720 | } |
7bc95e2e | 2721 | |
2722 | int register readBufDataP = data - dmaBuf; // number of bytes we have processed so far | |
2723 | int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR; // number of bytes already transferred | |
2724 | if (readBufDataP <= dmaBufDataP){ // we are processing the same block of data which is currently being transferred | |
2725 | dataLen = dmaBufDataP - readBufDataP; // number of bytes still to be processed | |
2726 | } else { | |
2727 | dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP; // number of bytes still to be processed | |
5cd9ec01 M |
2728 | } |
2729 | // test for length of buffer | |
7bc95e2e | 2730 | if(dataLen > maxDataLen) { // we are more behind than ever... |
2731 | maxDataLen = dataLen; | |
5cd9ec01 M |
2732 | if(dataLen > 400) { |
2733 | Dbprintf("blew circular buffer! dataLen=0x%x", dataLen); | |
7bc95e2e | 2734 | break; |
b62a5a84 M |
2735 | } |
2736 | } | |
5cd9ec01 | 2737 | if(dataLen < 1) continue; |
b62a5a84 | 2738 | |
7bc95e2e | 2739 | // primary buffer was stopped ( <-- we lost data! |
5cd9ec01 M |
2740 | if (!AT91C_BASE_PDC_SSC->PDC_RCR) { |
2741 | AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf; | |
2742 | AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE; | |
55acbb2a | 2743 | Dbprintf("RxEmpty ERROR!!! data length:%d", dataLen); // temporary |
5cd9ec01 M |
2744 | } |
2745 | // secondary buffer sets as primary, secondary buffer was stopped | |
2746 | if (!AT91C_BASE_PDC_SSC->PDC_RNCR) { | |
2747 | AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; | |
b62a5a84 M |
2748 | AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE; |
2749 | } | |
5cd9ec01 M |
2750 | |
2751 | LED_A_OFF(); | |
b62a5a84 | 2752 | |
7bc95e2e | 2753 | if (sniffCounter & 0x01) { |
b62a5a84 | 2754 | |
7bc95e2e | 2755 | if(!TagIsActive) { // no need to try decoding tag data if the reader is sending |
2756 | uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4); | |
2757 | if(MillerDecoding(readerdata, (sniffCounter-1)*4)) { | |
2758 | LED_C_INV(); | |
6a1f2d82 | 2759 | if (MfSniffLogic(receivedCmd, Uart.len, Uart.parity, Uart.bitCount, TRUE)) break; |
b62a5a84 | 2760 | |
7bc95e2e | 2761 | /* And ready to receive another command. */ |
2762 | UartReset(); | |
2763 | ||
2764 | /* And also reset the demod code */ | |
2765 | DemodReset(); | |
2766 | } | |
2767 | ReaderIsActive = (Uart.state != STATE_UNSYNCD); | |
2768 | } | |
2769 | ||
2770 | if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending | |
2771 | uint8_t tagdata = (previous_data << 4) | (*data & 0x0F); | |
2772 | if(ManchesterDecoding(tagdata, 0, (sniffCounter-1)*4)) { | |
2773 | LED_C_INV(); | |
b62a5a84 | 2774 | |
6a1f2d82 | 2775 | if (MfSniffLogic(receivedResponse, Demod.len, Demod.parity, Demod.bitCount, FALSE)) break; |
39864b0b | 2776 | |
7bc95e2e | 2777 | // And ready to receive another response. |
2778 | DemodReset(); | |
2779 | } | |
2780 | TagIsActive = (Demod.state != DEMOD_UNSYNCD); | |
2781 | } | |
b62a5a84 M |
2782 | } |
2783 | ||
7bc95e2e | 2784 | previous_data = *data; |
2785 | sniffCounter++; | |
5cd9ec01 | 2786 | data++; |
d714d3ef | 2787 | if(data == dmaBuf + DMA_BUFFER_SIZE) { |
5cd9ec01 | 2788 | data = dmaBuf; |
b62a5a84 | 2789 | } |
7bc95e2e | 2790 | |
b62a5a84 M |
2791 | } // main cycle |
2792 | ||
2793 | DbpString("COMMAND FINISHED"); | |
2794 | ||
55acbb2a | 2795 | FpgaDisableSscDma(); |
39864b0b M |
2796 | MfSniffEnd(); |
2797 | ||
7bc95e2e | 2798 | Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.len=%x", maxDataLen, Uart.state, Uart.len); |
b62a5a84 | 2799 | LEDsoff(); |
3803d529 | 2800 | } |