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a126332a | 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" |
15c4dc5a | 18 | #include "iso14443crc.h" |
534983d7 | 19 | #include "iso14443a.h" |
6fc68747 | 20 | #include "iso14443b.h" |
20f9a2a1 M |
21 | #include "crapto1.h" |
22 | #include "mifareutil.h" | |
3000dc4e | 23 | #include "BigBuf.h" |
f8ada309 | 24 | #include "parity.h" |
25 | ||
534983d7 | 26 | static uint32_t iso14a_timeout; |
1e262141 | 27 | int rsamples = 0; |
1e262141 | 28 | uint8_t trigger = 0; |
b0127e65 | 29 | // the block number for the ISO14443-4 PCB |
30 | static uint8_t iso14_pcb_blocknum = 0; | |
15c4dc5a | 31 | |
7bc95e2e | 32 | // |
33 | // ISO14443 timing: | |
34 | // | |
35 | // minimum time between the start bits of consecutive transfers from reader to tag: 7000 carrier (13.56Mhz) cycles | |
36 | #define REQUEST_GUARD_TIME (7000/16 + 1) | |
37 | // minimum time between last modulation of tag and next start bit from reader to tag: 1172 carrier cycles | |
38 | #define FRAME_DELAY_TIME_PICC_TO_PCD (1172/16 + 1) | |
39 | // bool LastCommandWasRequest = FALSE; | |
40 | ||
41 | // | |
42 | // Total delays including SSC-Transfers between ARM and FPGA. These are in carrier clock cycles (1/13,56MHz) | |
43 | // | |
d714d3ef | 44 | // When the PM acts as reader and is receiving tag data, it takes |
45 | // 3 ticks delay in the AD converter | |
46 | // 16 ticks until the modulation detector completes and sets curbit | |
47 | // 8 ticks until bit_to_arm is assigned from curbit | |
48 | // 8*16 ticks for the transfer from FPGA to ARM | |
7bc95e2e | 49 | // 4*16 ticks until we measure the time |
50 | // - 8*16 ticks because we measure the time of the previous transfer | |
d714d3ef | 51 | #define DELAY_AIR2ARM_AS_READER (3 + 16 + 8 + 8*16 + 4*16 - 8*16) |
7bc95e2e | 52 | |
53 | // When the PM acts as a reader and is sending, it takes | |
54 | // 4*16 ticks until we can write data to the sending hold register | |
55 | // 8*16 ticks until the SHR is transferred to the Sending Shift Register | |
56 | // 8 ticks until the first transfer starts | |
57 | // 8 ticks later the FPGA samples the data | |
58 | // 1 tick to assign mod_sig_coil | |
59 | #define DELAY_ARM2AIR_AS_READER (4*16 + 8*16 + 8 + 8 + 1) | |
60 | ||
61 | // When the PM acts as tag and is receiving it takes | |
d714d3ef | 62 | // 2 ticks delay in the RF part (for the first falling edge), |
7bc95e2e | 63 | // 3 ticks for the A/D conversion, |
64 | // 8 ticks on average until the start of the SSC transfer, | |
65 | // 8 ticks until the SSC samples the first data | |
66 | // 7*16 ticks to complete the transfer from FPGA to ARM | |
67 | // 8 ticks until the next ssp_clk rising edge | |
d714d3ef | 68 | // 4*16 ticks until we measure the time |
7bc95e2e | 69 | // - 8*16 ticks because we measure the time of the previous transfer |
d714d3ef | 70 | #define DELAY_AIR2ARM_AS_TAG (2 + 3 + 8 + 8 + 7*16 + 8 + 4*16 - 8*16) |
7bc95e2e | 71 | |
72 | // The FPGA will report its internal sending delay in | |
73 | uint16_t FpgaSendQueueDelay; | |
74 | // the 5 first bits are the number of bits buffered in mod_sig_buf | |
75 | // the last three bits are the remaining ticks/2 after the mod_sig_buf shift | |
76 | #define DELAY_FPGA_QUEUE (FpgaSendQueueDelay<<1) | |
77 | ||
78 | // When the PM acts as tag and is sending, it takes | |
d714d3ef | 79 | // 4*16 ticks until we can write data to the sending hold register |
7bc95e2e | 80 | // 8*16 ticks until the SHR is transferred to the Sending Shift Register |
81 | // 8 ticks until the first transfer starts | |
82 | // 8 ticks later the FPGA samples the data | |
83 | // + a varying number of ticks in the FPGA Delay Queue (mod_sig_buf) | |
84 | // + 1 tick to assign mod_sig_coil | |
d714d3ef | 85 | #define DELAY_ARM2AIR_AS_TAG (4*16 + 8*16 + 8 + 8 + DELAY_FPGA_QUEUE + 1) |
7bc95e2e | 86 | |
87 | // When the PM acts as sniffer and is receiving tag data, it takes | |
88 | // 3 ticks A/D conversion | |
d714d3ef | 89 | // 14 ticks to complete the modulation detection |
90 | // 8 ticks (on average) until the result is stored in to_arm | |
7bc95e2e | 91 | // + the delays in transferring data - which is the same for |
92 | // sniffing reader and tag data and therefore not relevant | |
d714d3ef | 93 | #define DELAY_TAG_AIR2ARM_AS_SNIFFER (3 + 14 + 8) |
7bc95e2e | 94 | |
d714d3ef | 95 | // When the PM acts as sniffer and is receiving reader data, it takes |
96 | // 2 ticks delay in analogue RF receiver (for the falling edge of the | |
97 | // start bit, which marks the start of the communication) | |
7bc95e2e | 98 | // 3 ticks A/D conversion |
d714d3ef | 99 | // 8 ticks on average until the data is stored in to_arm. |
7bc95e2e | 100 | // + the delays in transferring data - which is the same for |
101 | // sniffing reader and tag data and therefore not relevant | |
d714d3ef | 102 | #define DELAY_READER_AIR2ARM_AS_SNIFFER (2 + 3 + 8) |
7bc95e2e | 103 | |
104 | //variables used for timing purposes: | |
105 | //these are in ssp_clk cycles: | |
6a1f2d82 | 106 | static uint32_t NextTransferTime; |
107 | static uint32_t LastTimeProxToAirStart; | |
108 | static uint32_t LastProxToAirDuration; | |
7bc95e2e | 109 | |
8f51ddb0 | 110 | // CARD TO READER - manchester |
72934aa3 | 111 | // Sequence D: 11110000 modulation with subcarrier during first half |
112 | // Sequence E: 00001111 modulation with subcarrier during second half | |
113 | // Sequence F: 00000000 no modulation with subcarrier | |
8f51ddb0 | 114 | // READER TO CARD - miller |
72934aa3 | 115 | // Sequence X: 00001100 drop after half a period |
116 | // Sequence Y: 00000000 no drop | |
117 | // Sequence Z: 11000000 drop at start | |
118 | #define SEC_D 0xf0 | |
119 | #define SEC_E 0x0f | |
120 | #define SEC_F 0x00 | |
121 | #define SEC_X 0x0c | |
122 | #define SEC_Y 0x00 | |
123 | #define SEC_Z 0xc0 | |
15c4dc5a | 124 | |
902cb3c0 | 125 | void iso14a_set_trigger(bool enable) { |
534983d7 | 126 | trigger = enable; |
127 | } | |
128 | ||
b0127e65 | 129 | void iso14a_set_timeout(uint32_t timeout) { |
130 | iso14a_timeout = timeout; | |
19a700a8 | 131 | if(MF_DBGLEVEL >= 3) Dbprintf("ISO14443A Timeout set to %ld (%dms)", iso14a_timeout, iso14a_timeout / 106); |
b0127e65 | 132 | } |
8556b852 | 133 | |
19a700a8 | 134 | void iso14a_set_ATS_timeout(uint8_t *ats) { |
19a700a8 | 135 | uint8_t tb1; |
136 | uint8_t fwi; | |
137 | uint32_t fwt; | |
138 | ||
139 | if (ats[0] > 1) { // there is a format byte T0 | |
140 | if ((ats[1] & 0x20) == 0x20) { // there is an interface byte TB(1) | |
4c0cf2d2 | 141 | |
142 | if ((ats[1] & 0x10) == 0x10) // there is an interface byte TA(1) preceding TB(1) | |
19a700a8 | 143 | tb1 = ats[3]; |
4c0cf2d2 | 144 | else |
19a700a8 | 145 | tb1 = ats[2]; |
4c0cf2d2 | 146 | |
19a700a8 | 147 | fwi = (tb1 & 0xf0) >> 4; // frame waiting indicator (FWI) |
ca5bad3d | 148 | fwt = 256 * 16 * (1 << fwi); // frame waiting time (FWT) in 1/fc |
149 | //fwt = 4096 * (1 << fwi); | |
19a700a8 | 150 | |
ca5bad3d | 151 | iso14a_set_timeout(fwt/(8*16)); |
152 | //iso14a_set_timeout(fwt/128); | |
19a700a8 | 153 | } |
154 | } | |
155 | } | |
156 | ||
15c4dc5a | 157 | //----------------------------------------------------------------------------- |
158 | // Generate the parity value for a byte sequence | |
e30c654b | 159 | // |
15c4dc5a | 160 | //----------------------------------------------------------------------------- |
91c7a7cc | 161 | void GetParity(const uint8_t *pbtCmd, uint16_t iLen, uint8_t *par) { |
6a1f2d82 | 162 | uint16_t paritybit_cnt = 0; |
163 | uint16_t paritybyte_cnt = 0; | |
164 | uint8_t parityBits = 0; | |
165 | ||
166 | for (uint16_t i = 0; i < iLen; i++) { | |
167 | // Generate the parity bits | |
f8ada309 | 168 | parityBits |= ((oddparity8(pbtCmd[i])) << (7-paritybit_cnt)); |
6a1f2d82 | 169 | if (paritybit_cnt == 7) { |
170 | par[paritybyte_cnt] = parityBits; // save 8 Bits parity | |
171 | parityBits = 0; // and advance to next Parity Byte | |
172 | paritybyte_cnt++; | |
173 | paritybit_cnt = 0; | |
174 | } else { | |
175 | paritybit_cnt++; | |
176 | } | |
5f6d6c90 | 177 | } |
6a1f2d82 | 178 | |
179 | // save remaining parity bits | |
91c7a7cc | 180 | par[paritybyte_cnt] = parityBits; |
15c4dc5a | 181 | } |
182 | ||
91c7a7cc | 183 | void AppendCrc14443a(uint8_t* data, int len) { |
5f6d6c90 | 184 | ComputeCrc14443(CRC_14443_A,data,len,data+len,data+len+1); |
15c4dc5a | 185 | } |
186 | ||
7bc95e2e | 187 | //============================================================================= |
188 | // ISO 14443 Type A - Miller decoder | |
189 | //============================================================================= | |
190 | // Basics: | |
191 | // This decoder is used when the PM3 acts as a tag. | |
192 | // The reader will generate "pauses" by temporarily switching of the field. | |
193 | // At the PM3 antenna we will therefore measure a modulated antenna voltage. | |
194 | // The FPGA does a comparison with a threshold and would deliver e.g.: | |
195 | // ........ 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 ....... | |
196 | // The Miller decoder needs to identify the following sequences: | |
197 | // 2 (or 3) ticks pause followed by 6 (or 5) ticks unmodulated: pause at beginning - Sequence Z ("start of communication" or a "0") | |
198 | // 8 ticks without a modulation: no pause - Sequence Y (a "0" or "end of communication" or "no information") | |
199 | // 4 ticks unmodulated followed by 2 (or 3) ticks pause: pause in second half - Sequence X (a "1") | |
200 | // Note 1: the bitstream may start at any time. We therefore need to sync. | |
201 | // Note 2: the interpretation of Sequence Y and Z depends on the preceding sequence. | |
15c4dc5a | 202 | //----------------------------------------------------------------------------- |
b62a5a84 | 203 | static tUart Uart; |
15c4dc5a | 204 | |
d7aa3739 | 205 | // Lookup-Table to decide if 4 raw bits are a modulation. |
0ec548dc | 206 | // We accept the following: |
207 | // 0001 - a 3 tick wide pause | |
208 | // 0011 - a 2 tick wide pause, or a three tick wide pause shifted left | |
209 | // 0111 - a 2 tick wide pause shifted left | |
210 | // 1001 - a 2 tick wide pause shifted right | |
d7aa3739 | 211 | const bool Mod_Miller_LUT[] = { |
0ec548dc | 212 | FALSE, TRUE, FALSE, TRUE, FALSE, FALSE, FALSE, TRUE, |
213 | FALSE, TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE | |
d7aa3739 | 214 | }; |
0ec548dc | 215 | #define IsMillerModulationNibble1(b) (Mod_Miller_LUT[(b & 0x000000F0) >> 4]) |
216 | #define IsMillerModulationNibble2(b) (Mod_Miller_LUT[(b & 0x0000000F)]) | |
d7aa3739 | 217 | |
91c7a7cc | 218 | void UartReset() { |
7bc95e2e | 219 | Uart.state = STATE_UNSYNCD; |
220 | Uart.bitCount = 0; | |
221 | Uart.len = 0; // number of decoded data bytes | |
6a1f2d82 | 222 | Uart.parityLen = 0; // number of decoded parity bytes |
7bc95e2e | 223 | Uart.shiftReg = 0; // shiftreg to hold decoded data bits |
6a1f2d82 | 224 | Uart.parityBits = 0; // holds 8 parity bits |
7bc95e2e | 225 | Uart.startTime = 0; |
226 | Uart.endTime = 0; | |
46c65fed | 227 | |
228 | Uart.byteCntMax = 0; | |
229 | Uart.posCnt = 0; | |
230 | Uart.syncBit = 9999; | |
7bc95e2e | 231 | } |
15c4dc5a | 232 | |
91c7a7cc | 233 | void UartInit(uint8_t *data, uint8_t *parity) { |
6a1f2d82 | 234 | Uart.output = data; |
235 | Uart.parity = parity; | |
0ec548dc | 236 | Uart.fourBits = 0x00000000; // clear the buffer for 4 Bits |
6a1f2d82 | 237 | UartReset(); |
238 | } | |
d714d3ef | 239 | |
7bc95e2e | 240 | // use parameter non_real_time to provide a timestamp. Set to 0 if the decoder should measure real time |
91c7a7cc | 241 | static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) { |
0ec548dc | 242 | Uart.fourBits = (Uart.fourBits << 8) | bit; |
7bc95e2e | 243 | |
0c8d25eb | 244 | if (Uart.state == STATE_UNSYNCD) { // not yet synced |
91c7a7cc | 245 | Uart.syncBit = 9999; // not set |
46c65fed | 246 | |
247 | // 00x11111 2|3 ticks pause followed by 6|5 ticks unmodulated Sequence Z (a "0" or "start of communication") | |
248 | // 11111111 8 ticks unmodulation Sequence Y (a "0" or "end of communication" or "no information") | |
249 | // 111100x1 4 ticks unmodulated followed by 2|3 ticks pause Sequence X (a "1") | |
250 | ||
0ec548dc | 251 | // The start bit is one ore more Sequence Y followed by a Sequence Z (... 11111111 00x11111). We need to distinguish from |
46c65fed | 252 | // Sequence X followed by Sequence Y followed by Sequence Z (111100x1 11111111 00x11111) |
253 | // we therefore look for a ...xx1111 11111111 00x11111xxxxxx... pattern | |
0ec548dc | 254 | // (12 '1's followed by 2 '0's, eventually followed by another '0', followed by 5 '1's) |
46c65fed | 255 | // |
256 | #define ISO14443A_STARTBIT_MASK 0x07FFEF80 // mask is 00001111 11111111 1110 1111 10000000 | |
257 | #define ISO14443A_STARTBIT_PATTERN 0x07FF8F80 // pattern is 00001111 11111111 1000 1111 10000000 | |
258 | ||
0ec548dc | 259 | if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 0)) == ISO14443A_STARTBIT_PATTERN >> 0) Uart.syncBit = 7; |
260 | else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 1)) == ISO14443A_STARTBIT_PATTERN >> 1) Uart.syncBit = 6; | |
261 | else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 2)) == ISO14443A_STARTBIT_PATTERN >> 2) Uart.syncBit = 5; | |
262 | else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 3)) == ISO14443A_STARTBIT_PATTERN >> 3) Uart.syncBit = 4; | |
263 | else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 4)) == ISO14443A_STARTBIT_PATTERN >> 4) Uart.syncBit = 3; | |
264 | else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 5)) == ISO14443A_STARTBIT_PATTERN >> 5) Uart.syncBit = 2; | |
265 | else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 6)) == ISO14443A_STARTBIT_PATTERN >> 6) Uart.syncBit = 1; | |
266 | else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 7)) == ISO14443A_STARTBIT_PATTERN >> 7) Uart.syncBit = 0; | |
267 | ||
268 | if (Uart.syncBit != 9999) { // found a sync bit | |
91c7a7cc | 269 | Uart.startTime = non_real_time ? non_real_time : (GetCountSspClk() & 0xfffffff8); |
270 | Uart.startTime -= Uart.syncBit; | |
271 | Uart.endTime = Uart.startTime; | |
272 | Uart.state = STATE_START_OF_COMMUNICATION; | |
273 | } | |
7bc95e2e | 274 | } else { |
15c4dc5a | 275 | |
0ec548dc | 276 | if (IsMillerModulationNibble1(Uart.fourBits >> Uart.syncBit)) { |
277 | if (IsMillerModulationNibble2(Uart.fourBits >> Uart.syncBit)) { // Modulation in both halves - error | |
d7aa3739 | 278 | UartReset(); |
d7aa3739 | 279 | } else { // Modulation in first half = Sequence Z = logic "0" |
7bc95e2e | 280 | if (Uart.state == STATE_MILLER_X) { // error - must not follow after X |
281 | UartReset(); | |
7bc95e2e | 282 | } else { |
283 | Uart.bitCount++; | |
284 | Uart.shiftReg = (Uart.shiftReg >> 1); // add a 0 to the shiftreg | |
285 | Uart.state = STATE_MILLER_Z; | |
286 | Uart.endTime = Uart.startTime + 8*(9*Uart.len + Uart.bitCount + 1) - 6; | |
287 | if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity) | |
288 | Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); | |
289 | Uart.parityBits <<= 1; // make room for the parity bit | |
290 | Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit | |
291 | Uart.bitCount = 0; | |
292 | Uart.shiftReg = 0; | |
6a1f2d82 | 293 | if((Uart.len&0x0007) == 0) { // every 8 data bytes |
294 | Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits | |
295 | Uart.parityBits = 0; | |
296 | } | |
15c4dc5a | 297 | } |
7bc95e2e | 298 | } |
d7aa3739 | 299 | } |
300 | } else { | |
0ec548dc | 301 | if (IsMillerModulationNibble2(Uart.fourBits >> Uart.syncBit)) { // Modulation second half = Sequence X = logic "1" |
7bc95e2e | 302 | Uart.bitCount++; |
303 | Uart.shiftReg = (Uart.shiftReg >> 1) | 0x100; // add a 1 to the shiftreg | |
304 | Uart.state = STATE_MILLER_X; | |
305 | Uart.endTime = Uart.startTime + 8*(9*Uart.len + Uart.bitCount + 1) - 2; | |
306 | if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity) | |
307 | Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); | |
308 | Uart.parityBits <<= 1; // make room for the new parity bit | |
309 | Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit | |
310 | Uart.bitCount = 0; | |
311 | Uart.shiftReg = 0; | |
6a1f2d82 | 312 | if ((Uart.len&0x0007) == 0) { // every 8 data bytes |
313 | Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits | |
314 | Uart.parityBits = 0; | |
315 | } | |
7bc95e2e | 316 | } |
d7aa3739 | 317 | } else { // no modulation in both halves - Sequence Y |
7bc95e2e | 318 | if (Uart.state == STATE_MILLER_Z || Uart.state == STATE_MILLER_Y) { // Y after logic "0" - End of Communication |
15c4dc5a | 319 | Uart.state = STATE_UNSYNCD; |
6a1f2d82 | 320 | Uart.bitCount--; // last "0" was part of EOC sequence |
321 | Uart.shiftReg <<= 1; // drop it | |
322 | if(Uart.bitCount > 0) { // if we decoded some bits | |
323 | Uart.shiftReg >>= (9 - Uart.bitCount); // right align them | |
324 | Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); // add last byte to the output | |
325 | Uart.parityBits <<= 1; // add a (void) parity bit | |
326 | Uart.parityBits <<= (8 - (Uart.len&0x0007)); // left align parity bits | |
327 | Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store it | |
328 | return TRUE; | |
329 | } else if (Uart.len & 0x0007) { // there are some parity bits to store | |
330 | Uart.parityBits <<= (8 - (Uart.len&0x0007)); // left align remaining parity bits | |
331 | Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store them | |
52bfb955 | 332 | } |
333 | if (Uart.len) { | |
6a1f2d82 | 334 | return TRUE; // we are finished with decoding the raw data sequence |
52bfb955 | 335 | } else { |
0c8d25eb | 336 | UartReset(); // Nothing received - start over |
7bc95e2e | 337 | } |
15c4dc5a | 338 | } |
7bc95e2e | 339 | if (Uart.state == STATE_START_OF_COMMUNICATION) { // error - must not follow directly after SOC |
340 | UartReset(); | |
7bc95e2e | 341 | } else { // a logic "0" |
342 | Uart.bitCount++; | |
343 | Uart.shiftReg = (Uart.shiftReg >> 1); // add a 0 to the shiftreg | |
344 | Uart.state = STATE_MILLER_Y; | |
345 | if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity) | |
346 | Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); | |
347 | Uart.parityBits <<= 1; // make room for the parity bit | |
348 | Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit | |
349 | Uart.bitCount = 0; | |
350 | Uart.shiftReg = 0; | |
6a1f2d82 | 351 | if ((Uart.len&0x0007) == 0) { // every 8 data bytes |
352 | Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits | |
353 | Uart.parityBits = 0; | |
354 | } | |
15c4dc5a | 355 | } |
356 | } | |
d7aa3739 | 357 | } |
15c4dc5a | 358 | } |
7bc95e2e | 359 | } |
7bc95e2e | 360 | return FALSE; // not finished yet, need more data |
15c4dc5a | 361 | } |
362 | ||
7bc95e2e | 363 | |
364 | ||
15c4dc5a | 365 | //============================================================================= |
e691fc45 | 366 | // ISO 14443 Type A - Manchester decoder |
15c4dc5a | 367 | //============================================================================= |
e691fc45 | 368 | // Basics: |
7bc95e2e | 369 | // This decoder is used when the PM3 acts as a reader. |
e691fc45 | 370 | // The tag will modulate the reader field by asserting different loads to it. As a consequence, the voltage |
371 | // at the reader antenna will be modulated as well. The FPGA detects the modulation for us and would deliver e.g. the following: | |
372 | // ........ 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 ....... | |
373 | // The Manchester decoder needs to identify the following sequences: | |
374 | // 4 ticks modulated followed by 4 ticks unmodulated: Sequence D = 1 (also used as "start of communication") | |
375 | // 4 ticks unmodulated followed by 4 ticks modulated: Sequence E = 0 | |
376 | // 8 ticks unmodulated: Sequence F = end of communication | |
377 | // 8 ticks modulated: A collision. Save the collision position and treat as Sequence D | |
7bc95e2e | 378 | // Note 1: the bitstream may start at any time. We therefore need to sync. |
e691fc45 | 379 | // Note 2: parameter offset is used to determine the position of the parity bits (required for the anticollision command only) |
b62a5a84 | 380 | static tDemod Demod; |
15c4dc5a | 381 | |
d7aa3739 | 382 | // Lookup-Table to decide if 4 raw bits are a modulation. |
d714d3ef | 383 | // We accept three or four "1" in any position |
7bc95e2e | 384 | const bool Mod_Manchester_LUT[] = { |
d7aa3739 | 385 | FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, TRUE, |
d714d3ef | 386 | FALSE, FALSE, FALSE, TRUE, FALSE, TRUE, TRUE, TRUE |
7bc95e2e | 387 | }; |
388 | ||
389 | #define IsManchesterModulationNibble1(b) (Mod_Manchester_LUT[(b & 0x00F0) >> 4]) | |
390 | #define IsManchesterModulationNibble2(b) (Mod_Manchester_LUT[(b & 0x000F)]) | |
15c4dc5a | 391 | |
91c7a7cc | 392 | void DemodReset() { |
7bc95e2e | 393 | Demod.state = DEMOD_UNSYNCD; |
394 | Demod.len = 0; // number of decoded data bytes | |
6a1f2d82 | 395 | Demod.parityLen = 0; |
7bc95e2e | 396 | Demod.shiftReg = 0; // shiftreg to hold decoded data bits |
397 | Demod.parityBits = 0; // | |
398 | Demod.collisionPos = 0; // Position of collision bit | |
399 | Demod.twoBits = 0xffff; // buffer for 2 Bits | |
400 | Demod.highCnt = 0; | |
401 | Demod.startTime = 0; | |
91c7a7cc | 402 | Demod.endTime = 0; |
46c65fed | 403 | Demod.bitCount = 0; |
404 | Demod.syncBit = 0xFFFF; | |
405 | Demod.samples = 0; | |
e691fc45 | 406 | } |
15c4dc5a | 407 | |
91c7a7cc | 408 | void DemodInit(uint8_t *data, uint8_t *parity) { |
6a1f2d82 | 409 | Demod.output = data; |
410 | Demod.parity = parity; | |
411 | DemodReset(); | |
412 | } | |
413 | ||
7bc95e2e | 414 | // use parameter non_real_time to provide a timestamp. Set to 0 if the decoder should measure real time |
91c7a7cc | 415 | static RAMFUNC int ManchesterDecoding(uint8_t bit, uint16_t offset, uint32_t non_real_time) { |
7bc95e2e | 416 | Demod.twoBits = (Demod.twoBits << 8) | bit; |
e691fc45 | 417 | |
7bc95e2e | 418 | if (Demod.state == DEMOD_UNSYNCD) { |
419 | ||
420 | if (Demod.highCnt < 2) { // wait for a stable unmodulated signal | |
421 | if (Demod.twoBits == 0x0000) { | |
422 | Demod.highCnt++; | |
423 | } else { | |
424 | Demod.highCnt = 0; | |
425 | } | |
426 | } else { | |
427 | Demod.syncBit = 0xFFFF; // not set | |
428 | if ((Demod.twoBits & 0x7700) == 0x7000) Demod.syncBit = 7; | |
429 | else if ((Demod.twoBits & 0x3B80) == 0x3800) Demod.syncBit = 6; | |
430 | else if ((Demod.twoBits & 0x1DC0) == 0x1C00) Demod.syncBit = 5; | |
431 | else if ((Demod.twoBits & 0x0EE0) == 0x0E00) Demod.syncBit = 4; | |
432 | else if ((Demod.twoBits & 0x0770) == 0x0700) Demod.syncBit = 3; | |
433 | else if ((Demod.twoBits & 0x03B8) == 0x0380) Demod.syncBit = 2; | |
434 | else if ((Demod.twoBits & 0x01DC) == 0x01C0) Demod.syncBit = 1; | |
435 | else if ((Demod.twoBits & 0x00EE) == 0x00E0) Demod.syncBit = 0; | |
d7aa3739 | 436 | if (Demod.syncBit != 0xFFFF) { |
7bc95e2e | 437 | Demod.startTime = non_real_time?non_real_time:(GetCountSspClk() & 0xfffffff8); |
438 | Demod.startTime -= Demod.syncBit; | |
439 | Demod.bitCount = offset; // number of decoded data bits | |
e691fc45 | 440 | Demod.state = DEMOD_MANCHESTER_DATA; |
2f2d9fc5 | 441 | } |
7bc95e2e | 442 | } |
7bc95e2e | 443 | } else { |
15c4dc5a | 444 | |
7bc95e2e | 445 | if (IsManchesterModulationNibble1(Demod.twoBits >> Demod.syncBit)) { // modulation in first half |
446 | if (IsManchesterModulationNibble2(Demod.twoBits >> Demod.syncBit)) { // ... and in second half = collision | |
e691fc45 | 447 | if (!Demod.collisionPos) { |
448 | Demod.collisionPos = (Demod.len << 3) + Demod.bitCount; | |
449 | } | |
450 | } // modulation in first half only - Sequence D = 1 | |
7bc95e2e | 451 | Demod.bitCount++; |
452 | Demod.shiftReg = (Demod.shiftReg >> 1) | 0x100; // in both cases, add a 1 to the shiftreg | |
453 | if(Demod.bitCount == 9) { // if we decoded a full byte (including parity) | |
e691fc45 | 454 | Demod.output[Demod.len++] = (Demod.shiftReg & 0xff); |
7bc95e2e | 455 | Demod.parityBits <<= 1; // make room for the parity bit |
e691fc45 | 456 | Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit |
457 | Demod.bitCount = 0; | |
458 | Demod.shiftReg = 0; | |
6a1f2d82 | 459 | if((Demod.len&0x0007) == 0) { // every 8 data bytes |
460 | Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits | |
461 | Demod.parityBits = 0; | |
462 | } | |
15c4dc5a | 463 | } |
7bc95e2e | 464 | Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1) - 4; |
465 | } else { // no modulation in first half | |
466 | if (IsManchesterModulationNibble2(Demod.twoBits >> Demod.syncBit)) { // and modulation in second half = Sequence E = 0 | |
e691fc45 | 467 | Demod.bitCount++; |
7bc95e2e | 468 | Demod.shiftReg = (Demod.shiftReg >> 1); // add a 0 to the shiftreg |
e691fc45 | 469 | if(Demod.bitCount >= 9) { // if we decoded a full byte (including parity) |
e691fc45 | 470 | Demod.output[Demod.len++] = (Demod.shiftReg & 0xff); |
7bc95e2e | 471 | Demod.parityBits <<= 1; // make room for the new parity bit |
e691fc45 | 472 | Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit |
473 | Demod.bitCount = 0; | |
474 | Demod.shiftReg = 0; | |
6a1f2d82 | 475 | if ((Demod.len&0x0007) == 0) { // every 8 data bytes |
476 | Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits1 | |
477 | Demod.parityBits = 0; | |
478 | } | |
15c4dc5a | 479 | } |
7bc95e2e | 480 | Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1); |
e691fc45 | 481 | } else { // no modulation in both halves - End of communication |
6a1f2d82 | 482 | if(Demod.bitCount > 0) { // there are some remaining data bits |
483 | Demod.shiftReg >>= (9 - Demod.bitCount); // right align the decoded bits | |
484 | Demod.output[Demod.len++] = Demod.shiftReg & 0xff; // and add them to the output | |
485 | Demod.parityBits <<= 1; // add a (void) parity bit | |
486 | Demod.parityBits <<= (8 - (Demod.len&0x0007)); // left align remaining parity bits | |
487 | Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them | |
488 | return TRUE; | |
489 | } else if (Demod.len & 0x0007) { // there are some parity bits to store | |
490 | Demod.parityBits <<= (8 - (Demod.len&0x0007)); // left align remaining parity bits | |
491 | Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them | |
52bfb955 | 492 | } |
493 | if (Demod.len) { | |
d7aa3739 | 494 | return TRUE; // we are finished with decoding the raw data sequence |
495 | } else { // nothing received. Start over | |
496 | DemodReset(); | |
e691fc45 | 497 | } |
15c4dc5a | 498 | } |
7bc95e2e | 499 | } |
e691fc45 | 500 | } |
e691fc45 | 501 | return FALSE; // not finished yet, need more data |
15c4dc5a | 502 | } |
503 | ||
504 | //============================================================================= | |
505 | // Finally, a `sniffer' for ISO 14443 Type A | |
506 | // Both sides of communication! | |
507 | //============================================================================= | |
508 | ||
509 | //----------------------------------------------------------------------------- | |
510 | // Record the sequence of commands sent by the reader to the tag, with | |
511 | // triggering so that we start recording at the point that the tag is moved | |
512 | // near the reader. | |
513 | //----------------------------------------------------------------------------- | |
d26849d4 | 514 | void RAMFUNC SniffIso14443a(uint8_t param) { |
5cd9ec01 M |
515 | // param: |
516 | // bit 0 - trigger from first card answer | |
517 | // bit 1 - trigger from first reader 7-bit request | |
5cd9ec01 | 518 | LEDsoff(); |
5cd9ec01 | 519 | |
99cf19d9 | 520 | iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER); |
7bc95e2e | 521 | |
f71f4deb | 522 | // Allocate memory from BigBuf for some buffers |
523 | // free all previous allocations first | |
aaa1a9a2 | 524 | BigBuf_free(); BigBuf_Clear_ext(false); |
7838f4be | 525 | clear_trace(); |
526 | set_tracing(TRUE); | |
527 | ||
5cd9ec01 | 528 | // The command (reader -> tag) that we're receiving. |
f71f4deb | 529 | uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE); |
530 | uint8_t *receivedCmdPar = BigBuf_malloc(MAX_PARITY_SIZE); | |
6a1f2d82 | 531 | |
5cd9ec01 | 532 | // The response (tag -> reader) that we're receiving. |
f71f4deb | 533 | uint8_t *receivedResponse = BigBuf_malloc(MAX_FRAME_SIZE); |
534 | uint8_t *receivedResponsePar = BigBuf_malloc(MAX_PARITY_SIZE); | |
5cd9ec01 M |
535 | |
536 | // The DMA buffer, used to stream samples from the FPGA | |
f71f4deb | 537 | uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE); |
538 | ||
7bc95e2e | 539 | uint8_t *data = dmaBuf; |
540 | uint8_t previous_data = 0; | |
5cd9ec01 M |
541 | int maxDataLen = 0; |
542 | int dataLen = 0; | |
7bc95e2e | 543 | bool TagIsActive = FALSE; |
544 | bool ReaderIsActive = FALSE; | |
545 | ||
5cd9ec01 | 546 | // Set up the demodulator for tag -> reader responses. |
6a1f2d82 | 547 | DemodInit(receivedResponse, receivedResponsePar); |
548 | ||
5cd9ec01 | 549 | // Set up the demodulator for the reader -> tag commands |
6a1f2d82 | 550 | UartInit(receivedCmd, receivedCmdPar); |
551 | ||
7bc95e2e | 552 | // Setup and start DMA. |
5cd9ec01 | 553 | FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); |
7bc95e2e | 554 | |
99cf19d9 | 555 | // We won't start recording the frames that we acquire until we trigger; |
556 | // a good trigger condition to get started is probably when we see a | |
557 | // response from the tag. | |
558 | // triggered == FALSE -- to wait first for card | |
559 | bool triggered = !(param & 0x03); | |
560 | ||
5cd9ec01 | 561 | // And now we loop, receiving samples. |
7bc95e2e | 562 | for(uint32_t rsamples = 0; TRUE; ) { |
563 | ||
5cd9ec01 M |
564 | if(BUTTON_PRESS()) { |
565 | DbpString("cancelled by button"); | |
7bc95e2e | 566 | break; |
5cd9ec01 | 567 | } |
15c4dc5a | 568 | |
5cd9ec01 M |
569 | LED_A_ON(); |
570 | WDT_HIT(); | |
15c4dc5a | 571 | |
5cd9ec01 M |
572 | int register readBufDataP = data - dmaBuf; |
573 | int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR; | |
574 | if (readBufDataP <= dmaBufDataP){ | |
575 | dataLen = dmaBufDataP - readBufDataP; | |
576 | } else { | |
7bc95e2e | 577 | dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP; |
5cd9ec01 M |
578 | } |
579 | // test for length of buffer | |
580 | if(dataLen > maxDataLen) { | |
581 | maxDataLen = dataLen; | |
f71f4deb | 582 | if(dataLen > (9 * DMA_BUFFER_SIZE / 10)) { |
7bc95e2e | 583 | Dbprintf("blew circular buffer! dataLen=%d", dataLen); |
584 | break; | |
5cd9ec01 M |
585 | } |
586 | } | |
587 | if(dataLen < 1) continue; | |
588 | ||
589 | // primary buffer was stopped( <-- we lost data! | |
590 | if (!AT91C_BASE_PDC_SSC->PDC_RCR) { | |
591 | AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf; | |
592 | AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE; | |
7bc95e2e | 593 | Dbprintf("RxEmpty ERROR!!! data length:%d", dataLen); // temporary |
5cd9ec01 M |
594 | } |
595 | // secondary buffer sets as primary, secondary buffer was stopped | |
596 | if (!AT91C_BASE_PDC_SSC->PDC_RNCR) { | |
597 | AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; | |
598 | AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE; | |
599 | } | |
600 | ||
601 | LED_A_OFF(); | |
7bc95e2e | 602 | |
603 | if (rsamples & 0x01) { // Need two samples to feed Miller and Manchester-Decoder | |
3be2a5ae | 604 | |
7bc95e2e | 605 | if(!TagIsActive) { // no need to try decoding reader data if the tag is sending |
606 | uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4); | |
607 | if (MillerDecoding(readerdata, (rsamples-1)*4)) { | |
608 | LED_C_ON(); | |
5cd9ec01 | 609 | |
7bc95e2e | 610 | // check - if there is a short 7bit request from reader |
611 | if ((!triggered) && (param & 0x02) && (Uart.len == 1) && (Uart.bitCount == 7)) triggered = TRUE; | |
5cd9ec01 | 612 | |
7bc95e2e | 613 | if(triggered) { |
6a1f2d82 | 614 | if (!LogTrace(receivedCmd, |
615 | Uart.len, | |
616 | Uart.startTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, | |
617 | Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, | |
618 | Uart.parity, | |
619 | TRUE)) break; | |
7bc95e2e | 620 | } |
621 | /* And ready to receive another command. */ | |
622 | UartReset(); | |
623 | /* And also reset the demod code, which might have been */ | |
624 | /* false-triggered by the commands from the reader. */ | |
625 | DemodReset(); | |
626 | LED_B_OFF(); | |
627 | } | |
628 | ReaderIsActive = (Uart.state != STATE_UNSYNCD); | |
5cd9ec01 | 629 | } |
3be2a5ae | 630 | |
7bc95e2e | 631 | if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time |
632 | uint8_t tagdata = (previous_data << 4) | (*data & 0x0F); | |
633 | if(ManchesterDecoding(tagdata, 0, (rsamples-1)*4)) { | |
634 | LED_B_ON(); | |
5cd9ec01 | 635 | |
6a1f2d82 | 636 | if (!LogTrace(receivedResponse, |
637 | Demod.len, | |
638 | Demod.startTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER, | |
639 | Demod.endTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER, | |
640 | Demod.parity, | |
641 | FALSE)) break; | |
5cd9ec01 | 642 | |
7bc95e2e | 643 | if ((!triggered) && (param & 0x01)) triggered = TRUE; |
5cd9ec01 | 644 | |
7bc95e2e | 645 | // And ready to receive another response. |
646 | DemodReset(); | |
0ec548dc | 647 | // And reset the Miller decoder including itS (now outdated) input buffer |
648 | UartInit(receivedCmd, receivedCmdPar); | |
7bc95e2e | 649 | LED_C_OFF(); |
650 | } | |
651 | TagIsActive = (Demod.state != DEMOD_UNSYNCD); | |
652 | } | |
5cd9ec01 M |
653 | } |
654 | ||
7bc95e2e | 655 | previous_data = *data; |
656 | rsamples++; | |
5cd9ec01 | 657 | data++; |
d714d3ef | 658 | if(data == dmaBuf + DMA_BUFFER_SIZE) { |
5cd9ec01 M |
659 | data = dmaBuf; |
660 | } | |
661 | } // main cycle | |
662 | ||
7bc95e2e | 663 | FpgaDisableSscDma(); |
7838f4be | 664 | LEDsoff(); |
665 | ||
7bc95e2e | 666 | Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len); |
3000dc4e | 667 | Dbprintf("traceLen=%d, Uart.output[0]=%08x", BigBuf_get_traceLen(), (uint32_t)Uart.output[0]); |
5ee53a0e | 668 | |
91c7a7cc | 669 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); |
5ee53a0e | 670 | set_tracing(FALSE); |
15c4dc5a | 671 | } |
672 | ||
15c4dc5a | 673 | //----------------------------------------------------------------------------- |
674 | // Prepare tag messages | |
675 | //----------------------------------------------------------------------------- | |
91c7a7cc | 676 | static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *parity) { |
8f51ddb0 | 677 | ToSendReset(); |
15c4dc5a | 678 | |
679 | // Correction bit, might be removed when not needed | |
680 | ToSendStuffBit(0); | |
681 | ToSendStuffBit(0); | |
682 | ToSendStuffBit(0); | |
683 | ToSendStuffBit(0); | |
684 | ToSendStuffBit(1); // 1 | |
685 | ToSendStuffBit(0); | |
686 | ToSendStuffBit(0); | |
687 | ToSendStuffBit(0); | |
8f51ddb0 | 688 | |
15c4dc5a | 689 | // Send startbit |
72934aa3 | 690 | ToSend[++ToSendMax] = SEC_D; |
7bc95e2e | 691 | LastProxToAirDuration = 8 * ToSendMax - 4; |
15c4dc5a | 692 | |
6a1f2d82 | 693 | for(uint16_t i = 0; i < len; i++) { |
8f51ddb0 | 694 | uint8_t b = cmd[i]; |
15c4dc5a | 695 | |
696 | // Data bits | |
6a1f2d82 | 697 | for(uint16_t j = 0; j < 8; j++) { |
15c4dc5a | 698 | if(b & 1) { |
72934aa3 | 699 | ToSend[++ToSendMax] = SEC_D; |
15c4dc5a | 700 | } else { |
72934aa3 | 701 | ToSend[++ToSendMax] = SEC_E; |
8f51ddb0 M |
702 | } |
703 | b >>= 1; | |
704 | } | |
15c4dc5a | 705 | |
0014cb46 | 706 | // Get the parity bit |
6a1f2d82 | 707 | if (parity[i>>3] & (0x80>>(i&0x0007))) { |
8f51ddb0 | 708 | ToSend[++ToSendMax] = SEC_D; |
7bc95e2e | 709 | LastProxToAirDuration = 8 * ToSendMax - 4; |
15c4dc5a | 710 | } else { |
72934aa3 | 711 | ToSend[++ToSendMax] = SEC_E; |
7bc95e2e | 712 | LastProxToAirDuration = 8 * ToSendMax; |
15c4dc5a | 713 | } |
8f51ddb0 | 714 | } |
15c4dc5a | 715 | |
8f51ddb0 M |
716 | // Send stopbit |
717 | ToSend[++ToSendMax] = SEC_F; | |
15c4dc5a | 718 | |
8f51ddb0 | 719 | // Convert from last byte pos to length |
6fc68747 | 720 | ++ToSendMax; |
8f51ddb0 M |
721 | } |
722 | ||
91c7a7cc | 723 | static void CodeIso14443aAsTag(const uint8_t *cmd, uint16_t len) { |
7504dc50 | 724 | uint8_t par[MAX_PARITY_SIZE] = {0}; |
6a1f2d82 | 725 | GetParity(cmd, len, par); |
726 | CodeIso14443aAsTagPar(cmd, len, par); | |
15c4dc5a | 727 | } |
728 | ||
91c7a7cc | 729 | static void Code4bitAnswerAsTag(uint8_t cmd) { |
8f51ddb0 | 730 | int i; |
91c7a7cc | 731 | uint8_t b = cmd; |
8f51ddb0 | 732 | |
5f6d6c90 | 733 | ToSendReset(); |
8f51ddb0 M |
734 | |
735 | // Correction bit, might be removed when not needed | |
736 | ToSendStuffBit(0); | |
737 | ToSendStuffBit(0); | |
738 | ToSendStuffBit(0); | |
739 | ToSendStuffBit(0); | |
740 | ToSendStuffBit(1); // 1 | |
741 | ToSendStuffBit(0); | |
742 | ToSendStuffBit(0); | |
743 | ToSendStuffBit(0); | |
744 | ||
745 | // Send startbit | |
746 | ToSend[++ToSendMax] = SEC_D; | |
747 | ||
8f51ddb0 M |
748 | for(i = 0; i < 4; i++) { |
749 | if(b & 1) { | |
750 | ToSend[++ToSendMax] = SEC_D; | |
7bc95e2e | 751 | LastProxToAirDuration = 8 * ToSendMax - 4; |
8f51ddb0 M |
752 | } else { |
753 | ToSend[++ToSendMax] = SEC_E; | |
7bc95e2e | 754 | LastProxToAirDuration = 8 * ToSendMax; |
8f51ddb0 M |
755 | } |
756 | b >>= 1; | |
757 | } | |
758 | ||
759 | // Send stopbit | |
760 | ToSend[++ToSendMax] = SEC_F; | |
761 | ||
5f6d6c90 | 762 | // Convert from last byte pos to length |
763 | ToSendMax++; | |
15c4dc5a | 764 | } |
765 | ||
766 | //----------------------------------------------------------------------------- | |
767 | // Wait for commands from reader | |
768 | // Stop when button is pressed | |
769 | // Or return TRUE when command is captured | |
770 | //----------------------------------------------------------------------------- | |
91c7a7cc | 771 | static int GetIso14443aCommandFromReader(uint8_t *received, uint8_t *parity, int *len) { |
15c4dc5a | 772 | // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen |
773 | // only, since we are receiving, not transmitting). | |
774 | // Signal field is off with the appropriate LED | |
775 | LED_D_OFF(); | |
776 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN); | |
777 | ||
ca5bad3d | 778 | // Now run a `software UART` on the stream of incoming samples. |
6a1f2d82 | 779 | UartInit(received, parity); |
7bc95e2e | 780 | |
781 | // clear RXRDY: | |
782 | uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; | |
15c4dc5a | 783 | |
784 | for(;;) { | |
785 | WDT_HIT(); | |
786 | ||
787 | if(BUTTON_PRESS()) return FALSE; | |
7bc95e2e | 788 | |
15c4dc5a | 789 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { |
7bc95e2e | 790 | b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; |
791 | if(MillerDecoding(b, 0)) { | |
792 | *len = Uart.len; | |
15c4dc5a | 793 | return TRUE; |
794 | } | |
7bc95e2e | 795 | } |
15c4dc5a | 796 | } |
797 | } | |
28afbd2b | 798 | |
6a1f2d82 | 799 | static int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNeeded); |
7bc95e2e | 800 | int EmSend4bitEx(uint8_t resp, bool correctionNeeded); |
28afbd2b | 801 | int EmSend4bit(uint8_t resp); |
6a1f2d82 | 802 | int EmSendCmdExPar(uint8_t *resp, uint16_t respLen, bool correctionNeeded, uint8_t *par); |
803 | int EmSendCmdEx(uint8_t *resp, uint16_t respLen, bool correctionNeeded); | |
804 | int EmSendCmd(uint8_t *resp, uint16_t respLen); | |
805 | int EmSendCmdPar(uint8_t *resp, uint16_t respLen, uint8_t *par); | |
806 | bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint8_t *reader_Parity, | |
807 | uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint8_t *tag_Parity); | |
15c4dc5a | 808 | |
117d9ec2 | 809 | static uint8_t* free_buffer_pointer; |
ce02f6f9 | 810 | |
811 | typedef struct { | |
ca5bad3d | 812 | uint8_t* response; |
813 | size_t response_n; | |
814 | uint8_t* modulation; | |
815 | size_t modulation_n; | |
816 | uint32_t ProxToAirDuration; | |
ce02f6f9 | 817 | } tag_response_info_t; |
818 | ||
ce02f6f9 | 819 | bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffer_size) { |
7bc95e2e | 820 | // Example response, answer to MIFARE Classic read block will be 16 bytes + 2 CRC = 18 bytes |
ce02f6f9 | 821 | // This will need the following byte array for a modulation sequence |
822 | // 144 data bits (18 * 8) | |
823 | // 18 parity bits | |
824 | // 2 Start and stop | |
825 | // 1 Correction bit (Answer in 1172 or 1236 periods, see FPGA) | |
826 | // 1 just for the case | |
827 | // ----------- + | |
828 | // 166 bytes, since every bit that needs to be send costs us a byte | |
829 | // | |
91c7a7cc | 830 | // Prepare the tag modulation bits from the message |
831 | CodeIso14443aAsTag(response_info->response,response_info->response_n); | |
832 | ||
833 | // Make sure we do not exceed the free buffer space | |
834 | if (ToSendMax > max_buffer_size) { | |
835 | Dbprintf("Out of memory, when modulating bits for tag answer:"); | |
836 | Dbhexdump(response_info->response_n,response_info->response,false); | |
837 | return FALSE; | |
838 | } | |
839 | ||
840 | // Copy the byte array, used for this modulation to the buffer position | |
841 | memcpy(response_info->modulation,ToSend,ToSendMax); | |
842 | ||
843 | // Store the number of bytes that were used for encoding/modulation and the time needed to transfer them | |
844 | response_info->modulation_n = ToSendMax; | |
845 | response_info->ProxToAirDuration = LastProxToAirDuration; | |
846 | return TRUE; | |
ce02f6f9 | 847 | } |
848 | ||
f71f4deb | 849 | |
850 | // "precompile" responses. There are 7 predefined responses with a total of 28 bytes data to transmit. | |
851 | // Coded responses need one byte per bit to transfer (data, parity, start, stop, correction) | |
852 | // 28 * 8 data bits, 28 * 1 parity bits, 7 start bits, 7 stop bits, 7 correction bits | |
853 | // -> need 273 bytes buffer | |
c9216a92 | 854 | // 44 * 8 data bits, 44 * 1 parity bits, 9 start bits, 9 stop bits, 9 correction bits --370 |
855 | // 47 * 8 data bits, 47 * 1 parity bits, 10 start bits, 10 stop bits, 10 correction bits | |
856 | #define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 453 | |
f71f4deb | 857 | |
ce02f6f9 | 858 | bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) { |
ca5bad3d | 859 | // Retrieve and store the current buffer index |
860 | response_info->modulation = free_buffer_pointer; | |
861 | ||
862 | // Determine the maximum size we can use from our buffer | |
863 | size_t max_buffer_size = ALLOCATED_TAG_MODULATION_BUFFER_SIZE; | |
864 | ||
865 | // Forward the prepare tag modulation function to the inner function | |
866 | if (prepare_tag_modulation(response_info, max_buffer_size)) { | |
867 | // Update the free buffer offset | |
868 | free_buffer_pointer += ToSendMax; | |
869 | return true; | |
870 | } else { | |
871 | return false; | |
872 | } | |
ce02f6f9 | 873 | } |
874 | ||
15c4dc5a | 875 | //----------------------------------------------------------------------------- |
876 | // Main loop of simulated tag: receive commands from reader, decide what | |
877 | // response to send, and send it. | |
878 | //----------------------------------------------------------------------------- | |
91c7a7cc | 879 | void SimulateIso14443aTag(int tagType, int flags, byte_t* data) { |
a126332a | 880 | uint32_t counters[] = {0,0,0}; |
d26849d4 | 881 | //Here, we collect UID,NT,AR,NR,UID2,NT2,AR2,NR2 |
882 | // This can be used in a reader-only attack. | |
883 | // (it can also be retrieved via 'hf 14a list', but hey... | |
884 | uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0,0,0}; | |
885 | uint8_t ar_nr_collected = 0; | |
886 | ||
81cd0474 | 887 | uint8_t sak; |
32719adf | 888 | |
889 | // PACK response to PWD AUTH for EV1/NTAG | |
e98572a1 | 890 | uint8_t response8[4] = {0,0,0,0}; |
32719adf | 891 | |
81cd0474 | 892 | // The first response contains the ATQA (note: bytes are transmitted in reverse order). |
e98572a1 | 893 | uint8_t response1[2] = {0,0}; |
81cd0474 | 894 | |
895 | switch (tagType) { | |
896 | case 1: { // MIFARE Classic | |
897 | // Says: I am Mifare 1k - original line | |
898 | response1[0] = 0x04; | |
899 | response1[1] = 0x00; | |
900 | sak = 0x08; | |
901 | } break; | |
902 | case 2: { // MIFARE Ultralight | |
903 | // Says: I am a stupid memory tag, no crypto | |
32719adf | 904 | response1[0] = 0x44; |
81cd0474 | 905 | response1[1] = 0x00; |
906 | sak = 0x00; | |
907 | } break; | |
908 | case 3: { // MIFARE DESFire | |
909 | // Says: I am a DESFire tag, ph33r me | |
910 | response1[0] = 0x04; | |
911 | response1[1] = 0x03; | |
912 | sak = 0x20; | |
913 | } break; | |
914 | case 4: { // ISO/IEC 14443-4 | |
915 | // Says: I am a javacard (JCOP) | |
916 | response1[0] = 0x04; | |
917 | response1[1] = 0x00; | |
918 | sak = 0x28; | |
919 | } break; | |
3fe4ff4f | 920 | case 5: { // MIFARE TNP3XXX |
921 | // Says: I am a toy | |
922 | response1[0] = 0x01; | |
923 | response1[1] = 0x0f; | |
924 | sak = 0x01; | |
d26849d4 | 925 | } break; |
926 | case 6: { // MIFARE Mini | |
927 | // Says: I am a Mifare Mini, 320b | |
928 | response1[0] = 0x44; | |
929 | response1[1] = 0x00; | |
930 | sak = 0x09; | |
931 | } break; | |
32719adf | 932 | case 7: { // NTAG? |
933 | // Says: I am a NTAG, | |
934 | response1[0] = 0x44; | |
935 | response1[1] = 0x00; | |
936 | sak = 0x00; | |
937 | // PACK | |
938 | response8[0] = 0x80; | |
939 | response8[1] = 0x80; | |
940 | ComputeCrc14443(CRC_14443_A, response8, 2, &response8[2], &response8[3]); | |
2b1f4228 | 941 | // uid not supplied then get from emulator memory |
942 | if (data[0]==0) { | |
943 | uint16_t start = 4 * (0+12); | |
944 | uint8_t emdata[8]; | |
945 | emlGetMemBt( emdata, start, sizeof(emdata)); | |
946 | memcpy(data, emdata, 3); //uid bytes 0-2 | |
947 | memcpy(data+3, emdata+4, 4); //uid bytes 3-7 | |
948 | flags |= FLAG_7B_UID_IN_DATA; | |
949 | } | |
32719adf | 950 | } break; |
81cd0474 | 951 | default: { |
952 | Dbprintf("Error: unkown tagtype (%d)",tagType); | |
953 | return; | |
954 | } break; | |
955 | } | |
956 | ||
957 | // The second response contains the (mandatory) first 24 bits of the UID | |
c8b6da22 | 958 | uint8_t response2[5] = {0x00}; |
81cd0474 | 959 | |
960 | // Check if the uid uses the (optional) part | |
c8b6da22 | 961 | uint8_t response2a[5] = {0x00}; |
962 | ||
d26849d4 | 963 | if (flags & FLAG_7B_UID_IN_DATA) { |
81cd0474 | 964 | response2[0] = 0x88; |
d26849d4 | 965 | response2[1] = data[0]; |
966 | response2[2] = data[1]; | |
967 | response2[3] = data[2]; | |
968 | ||
969 | response2a[0] = data[3]; | |
970 | response2a[1] = data[4]; | |
971 | response2a[2] = data[5]; | |
c3c241f3 | 972 | response2a[3] = data[6]; //?? |
81cd0474 | 973 | response2a[4] = response2a[0] ^ response2a[1] ^ response2a[2] ^ response2a[3]; |
974 | ||
975 | // Configure the ATQA and SAK accordingly | |
976 | response1[0] |= 0x40; | |
977 | sak |= 0x04; | |
978 | } else { | |
d26849d4 | 979 | memcpy(response2, data, 4); |
980 | //num_to_bytes(uid_1st,4,response2); | |
81cd0474 | 981 | // Configure the ATQA and SAK accordingly |
982 | response1[0] &= 0xBF; | |
983 | sak &= 0xFB; | |
984 | } | |
985 | ||
986 | // Calculate the BitCountCheck (BCC) for the first 4 bytes of the UID. | |
987 | response2[4] = response2[0] ^ response2[1] ^ response2[2] ^ response2[3]; | |
988 | ||
989 | // Prepare the mandatory SAK (for 4 and 7 byte UID) | |
c8b6da22 | 990 | uint8_t response3[3] = {0x00}; |
81cd0474 | 991 | response3[0] = sak; |
992 | ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]); | |
993 | ||
994 | // Prepare the optional second SAK (for 7 byte UID), drop the cascade bit | |
c8b6da22 | 995 | uint8_t response3a[3] = {0x00}; |
81cd0474 | 996 | response3a[0] = sak & 0xFB; |
997 | ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]); | |
998 | ||
0de8e387 | 999 | uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce |
6a1f2d82 | 1000 | uint8_t response6[] = { 0x04, 0x58, 0x80, 0x02, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS: |
1001 | // Format byte = 0x58: FSCI=0x08 (FSC=256), TA(1) and TC(1) present, | |
1002 | // TA(1) = 0x80: different divisors not supported, DR = 1, DS = 1 | |
1003 | // 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) | |
1004 | // TC(1) = 0x02: CID supported, NAD not supported | |
ce02f6f9 | 1005 | ComputeCrc14443(CRC_14443_A, response6, 4, &response6[4], &response6[5]); |
1006 | ||
2b1f4228 | 1007 | // Prepare GET_VERSION (different for UL EV-1 / NTAG) |
32719adf | 1008 | //uint8_t response7_EV1[] = {0x00, 0x04, 0x03, 0x01, 0x01, 0x00, 0x0b, 0x03, 0xfd, 0xf7}; //EV1 48bytes VERSION. |
2b1f4228 | 1009 | //uint8_t response7_NTAG[] = {0x00, 0x04, 0x04, 0x02, 0x01, 0x00, 0x11, 0x03, 0x01, 0x9e}; //NTAG 215 |
32719adf | 1010 | |
c9216a92 | 1011 | // Prepare CHK_TEARING |
2b1f4228 | 1012 | //uint8_t response9[] = {0xBD,0x90,0x3f}; |
c9216a92 | 1013 | |
1014 | #define TAG_RESPONSE_COUNT 10 | |
7bc95e2e | 1015 | tag_response_info_t responses[TAG_RESPONSE_COUNT] = { |
1016 | { .response = response1, .response_n = sizeof(response1) }, // Answer to request - respond with card type | |
1017 | { .response = response2, .response_n = sizeof(response2) }, // Anticollision cascade1 - respond with uid | |
1018 | { .response = response2a, .response_n = sizeof(response2a) }, // Anticollision cascade2 - respond with 2nd half of uid if asked | |
1019 | { .response = response3, .response_n = sizeof(response3) }, // Acknowledge select - cascade 1 | |
1020 | { .response = response3a, .response_n = sizeof(response3a) }, // Acknowledge select - cascade 2 | |
1021 | { .response = response5, .response_n = sizeof(response5) }, // Authentication answer (random nonce) | |
1022 | { .response = response6, .response_n = sizeof(response6) }, // dummy ATS (pseudo-ATR), answer to RATS | |
4c0cf2d2 | 1023 | |
495d7f13 | 1024 | { .response = response8, .response_n = sizeof(response8) } // EV1/NTAG PACK response |
4c0cf2d2 | 1025 | }; |
1026 | //{ .response = response7_NTAG, .response_n = sizeof(response7_NTAG)}, // EV1/NTAG GET_VERSION response | |
2b1f4228 | 1027 | //{ .response = response9, .response_n = sizeof(response9) } // EV1/NTAG CHK_TEAR response |
4c0cf2d2 | 1028 | |
7bc95e2e | 1029 | |
1030 | // Allocate 512 bytes for the dynamic modulation, created when the reader queries for it | |
1031 | // Such a response is less time critical, so we can prepare them on the fly | |
1032 | #define DYNAMIC_RESPONSE_BUFFER_SIZE 64 | |
1033 | #define DYNAMIC_MODULATION_BUFFER_SIZE 512 | |
1034 | uint8_t dynamic_response_buffer[DYNAMIC_RESPONSE_BUFFER_SIZE]; | |
1035 | uint8_t dynamic_modulation_buffer[DYNAMIC_MODULATION_BUFFER_SIZE]; | |
1036 | tag_response_info_t dynamic_response_info = { | |
1037 | .response = dynamic_response_buffer, | |
1038 | .response_n = 0, | |
1039 | .modulation = dynamic_modulation_buffer, | |
1040 | .modulation_n = 0 | |
1041 | }; | |
ce02f6f9 | 1042 | |
99cf19d9 | 1043 | // We need to listen to the high-frequency, peak-detected path. |
1044 | iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN); | |
1045 | ||
f71f4deb | 1046 | BigBuf_free_keep_EM(); |
1047 | ||
1048 | // allocate buffers: | |
1049 | uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE); | |
1050 | uint8_t *receivedCmdPar = BigBuf_malloc(MAX_PARITY_SIZE); | |
1051 | free_buffer_pointer = BigBuf_malloc(ALLOCATED_TAG_MODULATION_BUFFER_SIZE); | |
1052 | ||
1053 | // clear trace | |
3000dc4e MHS |
1054 | clear_trace(); |
1055 | set_tracing(TRUE); | |
f71f4deb | 1056 | |
7bc95e2e | 1057 | // Prepare the responses of the anticollision phase |
ce02f6f9 | 1058 | // there will be not enough time to do this at the moment the reader sends it REQA |
495d7f13 | 1059 | for (size_t i=0; i<TAG_RESPONSE_COUNT; i++) |
7bc95e2e | 1060 | prepare_allocated_tag_modulation(&responses[i]); |
15c4dc5a | 1061 | |
7bc95e2e | 1062 | int len = 0; |
15c4dc5a | 1063 | |
1064 | // To control where we are in the protocol | |
1065 | int order = 0; | |
1066 | int lastorder; | |
1067 | ||
1068 | // Just to allow some checks | |
1069 | int happened = 0; | |
1070 | int happened2 = 0; | |
81cd0474 | 1071 | int cmdsRecvd = 0; |
15c4dc5a | 1072 | |
254b70a4 | 1073 | cmdsRecvd = 0; |
7bc95e2e | 1074 | tag_response_info_t* p_response; |
15c4dc5a | 1075 | |
254b70a4 | 1076 | LED_A_ON(); |
1077 | for(;;) { | |
4c0cf2d2 | 1078 | |
1079 | WDT_HIT(); | |
1080 | ||
7bc95e2e | 1081 | // Clean receive command buffer |
6a1f2d82 | 1082 | if(!GetIso14443aCommandFromReader(receivedCmd, receivedCmdPar, &len)) { |
ce02f6f9 | 1083 | DbpString("Button press"); |
254b70a4 | 1084 | break; |
1085 | } | |
7bc95e2e | 1086 | |
1087 | p_response = NULL; | |
1088 | ||
254b70a4 | 1089 | // Okay, look at the command now. |
1090 | lastorder = order; | |
1091 | if(receivedCmd[0] == 0x26) { // Received a REQUEST | |
ce02f6f9 | 1092 | p_response = &responses[0]; order = 1; |
254b70a4 | 1093 | } else if(receivedCmd[0] == 0x52) { // Received a WAKEUP |
ce02f6f9 | 1094 | p_response = &responses[0]; order = 6; |
254b70a4 | 1095 | } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x93) { // Received request for UID (cascade 1) |
ce02f6f9 | 1096 | p_response = &responses[1]; order = 2; |
6a1f2d82 | 1097 | } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x95) { // Received request for UID (cascade 2) |
ce02f6f9 | 1098 | p_response = &responses[2]; order = 20; |
254b70a4 | 1099 | } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x93) { // Received a SELECT (cascade 1) |
ce02f6f9 | 1100 | p_response = &responses[3]; order = 3; |
254b70a4 | 1101 | } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x95) { // Received a SELECT (cascade 2) |
ce02f6f9 | 1102 | p_response = &responses[4]; order = 30; |
254b70a4 | 1103 | } else if(receivedCmd[0] == 0x30) { // Received a (plain) READ |
32719adf | 1104 | uint8_t block = receivedCmd[1]; |
2b1f4228 | 1105 | // if Ultralight or NTAG (4 byte blocks) |
1106 | if ( tagType == 7 || tagType == 2 ) { | |
1107 | //first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature] | |
1108 | uint16_t start = 4 * (block+12); | |
5e428463 | 1109 | uint8_t emdata[MAX_MIFARE_FRAME_SIZE]; |
1110 | emlGetMemBt( emdata, start, 16); | |
1111 | AppendCrc14443a(emdata, 16); | |
1112 | EmSendCmdEx(emdata, sizeof(emdata), false); | |
2b1f4228 | 1113 | // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below |
32719adf | 1114 | p_response = NULL; |
2b1f4228 | 1115 | } else { // all other tags (16 byte block tags) |
1116 | EmSendCmdEx(data+(4*receivedCmd[1]),16,false); | |
32719adf | 1117 | // Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]); |
1118 | // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below | |
1119 | p_response = NULL; | |
1120 | } | |
91c7a7cc | 1121 | } else if(receivedCmd[0] == 0x3A) { // Received a FAST READ (ranged read) |
1122 | uint8_t emdata[MAX_FRAME_SIZE]; | |
1123 | //first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature] | |
1124 | int start = (receivedCmd[1]+12) * 4; | |
1125 | int len = (receivedCmd[2] - receivedCmd[1] + 1) * 4; | |
1126 | emlGetMemBt( emdata, start, len); | |
1127 | AppendCrc14443a(emdata, len); | |
1128 | EmSendCmdEx(emdata, len+2, false); | |
1129 | p_response = NULL; | |
839a53ae | 1130 | } else if(receivedCmd[0] == 0x3C && tagType == 7) { // Received a READ SIGNATURE -- |
91c7a7cc | 1131 | //first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature] |
1132 | uint16_t start = 4 * 4; | |
1133 | uint8_t emdata[34]; | |
1134 | emlGetMemBt( emdata, start, 32); | |
1135 | AppendCrc14443a(emdata, 32); | |
1136 | EmSendCmdEx(emdata, sizeof(emdata), false); | |
1137 | p_response = NULL; | |
a126332a | 1138 | } else if (receivedCmd[0] == 0x39 && tagType == 7) { // Received a READ COUNTER -- |
e9a92fe2 | 1139 | uint8_t index = receivedCmd[1]; |
a126332a | 1140 | uint8_t data[] = {0x00,0x00,0x00,0x14,0xa5}; |
e9a92fe2 | 1141 | if ( counters[index] > 0) { |
1142 | num_to_bytes(counters[index], 3, data); | |
1143 | AppendCrc14443a(data, sizeof(data)-2); | |
1144 | } | |
a126332a | 1145 | EmSendCmdEx(data,sizeof(data),false); |
1146 | p_response = NULL; | |
1147 | } else if (receivedCmd[0] == 0xA5 && tagType == 7) { // Received a INC COUNTER -- | |
ce3d6bd2 | 1148 | // number of counter |
a126332a | 1149 | uint8_t counter = receivedCmd[1]; |
1150 | uint32_t val = bytes_to_num(receivedCmd+2,4); | |
1151 | counters[counter] = val; | |
1152 | ||
ce3d6bd2 | 1153 | // send ACK |
1154 | uint8_t ack[] = {0x0a}; | |
1155 | EmSendCmdEx(ack,sizeof(ack),false); | |
91c7a7cc | 1156 | p_response = NULL; |
c9216a92 | 1157 | } else if(receivedCmd[0] == 0x3E && tagType == 7) { // Received a CHECK_TEARING_EVENT -- |
2b1f4228 | 1158 | //first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature] |
1159 | uint8_t emdata[3]; | |
1160 | uint8_t counter=0; | |
1161 | if (receivedCmd[1]<3) counter = receivedCmd[1]; | |
1162 | emlGetMemBt( emdata, 10+counter, 1); | |
1163 | AppendCrc14443a(emdata, sizeof(emdata)-2); | |
1164 | EmSendCmdEx(emdata, sizeof(emdata), false); | |
b0300679 | 1165 | p_response = NULL; |
254b70a4 | 1166 | } else if(receivedCmd[0] == 0x50) { // Received a HALT |
810f5379 | 1167 | LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 1168 | p_response = NULL; |
254b70a4 | 1169 | } else if(receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61) { // Received an authentication request |
32719adf | 1170 | |
1171 | if ( tagType == 7 ) { // IF NTAG /EV1 0x60 == GET_VERSION, not a authentication request. | |
2b1f4228 | 1172 | uint8_t emdata[10]; |
1173 | emlGetMemBt( emdata, 0, 8 ); | |
1174 | AppendCrc14443a(emdata, sizeof(emdata)-2); | |
1175 | EmSendCmdEx(emdata, sizeof(emdata), false); | |
1176 | p_response = NULL; | |
32719adf | 1177 | } else { |
1178 | p_response = &responses[5]; order = 7; | |
1179 | } | |
254b70a4 | 1180 | } else if(receivedCmd[0] == 0xE0) { // Received a RATS request |
7bc95e2e | 1181 | if (tagType == 1 || tagType == 2) { // RATS not supported |
1182 | EmSend4bit(CARD_NACK_NA); | |
1183 | p_response = NULL; | |
1184 | } else { | |
1185 | p_response = &responses[6]; order = 70; | |
1186 | } | |
6a1f2d82 | 1187 | } else if (order == 7 && len == 8) { // Received {nr] and {ar} (part of authentication) |
810f5379 | 1188 | LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
d26849d4 | 1189 | uint32_t nonce = bytes_to_num(response5,4); |
7bc95e2e | 1190 | uint32_t nr = bytes_to_num(receivedCmd,4); |
1191 | uint32_t ar = bytes_to_num(receivedCmd+4,4); | |
d26849d4 | 1192 | |
91c7a7cc | 1193 | if(flags & FLAG_NR_AR_ATTACK ) { |
d26849d4 | 1194 | if(ar_nr_collected < 2){ |
1195 | // Avoid duplicates... probably not necessary, nr should vary. | |
1196 | //if(ar_nr_responses[3] != nr){ | |
1197 | ar_nr_responses[ar_nr_collected*5] = 0; | |
1198 | ar_nr_responses[ar_nr_collected*5+1] = 0; | |
1199 | ar_nr_responses[ar_nr_collected*5+2] = nonce; | |
1200 | ar_nr_responses[ar_nr_collected*5+3] = nr; | |
1201 | ar_nr_responses[ar_nr_collected*5+4] = ar; | |
1202 | ar_nr_collected++; | |
1203 | //} | |
1204 | } | |
1205 | ||
1206 | if(ar_nr_collected > 1 ) { | |
1207 | ||
1208 | if (MF_DBGLEVEL >= 2) { | |
1209 | Dbprintf("Collected two pairs of AR/NR which can be used to extract keys from reader:"); | |
1210 | Dbprintf("../tools/mfkey/mfkey32 %07x%08x %08x %08x %08x %08x %08x", | |
1211 | ar_nr_responses[0], // UID1 | |
1212 | ar_nr_responses[1], // UID2 | |
1213 | ar_nr_responses[2], // NT | |
1214 | ar_nr_responses[3], // AR1 | |
1215 | ar_nr_responses[4], // NR1 | |
1216 | ar_nr_responses[8], // AR2 | |
1217 | ar_nr_responses[9] // NR2 | |
1218 | ); | |
7838f4be | 1219 | Dbprintf("../tools/mfkey/mfkey32v2 %06x%08x %08x %08x %08x %08x %08x %08x", |
1220 | ar_nr_responses[0], // UID1 | |
1221 | ar_nr_responses[1], // UID2 | |
1222 | ar_nr_responses[2], // NT1 | |
1223 | ar_nr_responses[3], // AR1 | |
1224 | ar_nr_responses[4], // NR1 | |
1225 | ar_nr_responses[7], // NT2 | |
1226 | ar_nr_responses[8], // AR2 | |
1227 | ar_nr_responses[9] // NR2 | |
1228 | ); | |
d26849d4 | 1229 | } |
1230 | uint8_t len = ar_nr_collected*5*4; | |
1231 | cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,len,0,&ar_nr_responses,len); | |
1232 | ar_nr_collected = 0; | |
1233 | memset(ar_nr_responses, 0x00, len); | |
d26849d4 | 1234 | } |
1235 | } | |
91c7a7cc | 1236 | } else if (receivedCmd[0] == 0x1a ) { // ULC authentication |
32719adf | 1237 | } |
91c7a7cc | 1238 | else if (receivedCmd[0] == 0x1b) { // NTAG / EV-1 authentication |
32719adf | 1239 | if ( tagType == 7 ) { |
2b1f4228 | 1240 | uint16_t start = 13; //first 4 blocks of emu are [getversion answer - check tearing - pack - 0x00] |
1241 | uint8_t emdata[4]; | |
1242 | emlGetMemBt( emdata, start, 2); | |
1243 | AppendCrc14443a(emdata, 2); | |
1244 | EmSendCmdEx(emdata, sizeof(emdata), false); | |
1245 | p_response = NULL; | |
ce3d6bd2 | 1246 | uint32_t pwd = bytes_to_num(receivedCmd+1,4); |
e98572a1 | 1247 | |
91c7a7cc | 1248 | if ( MF_DBGLEVEL >= 3) Dbprintf("Auth attempt: %08x", pwd); |
32719adf | 1249 | } |
2b1f4228 | 1250 | } else { |
7bc95e2e | 1251 | // Check for ISO 14443A-4 compliant commands, look at left nibble |
1252 | switch (receivedCmd[0]) { | |
7838f4be | 1253 | case 0x02: |
1254 | case 0x03: { // IBlock (command no CID) | |
1255 | dynamic_response_info.response[0] = receivedCmd[0]; | |
1256 | dynamic_response_info.response[1] = 0x90; | |
1257 | dynamic_response_info.response[2] = 0x00; | |
1258 | dynamic_response_info.response_n = 3; | |
1259 | } break; | |
7bc95e2e | 1260 | case 0x0B: |
7838f4be | 1261 | case 0x0A: { // IBlock (command CID) |
7bc95e2e | 1262 | dynamic_response_info.response[0] = receivedCmd[0]; |
1263 | dynamic_response_info.response[1] = 0x00; | |
1264 | dynamic_response_info.response[2] = 0x90; | |
1265 | dynamic_response_info.response[3] = 0x00; | |
1266 | dynamic_response_info.response_n = 4; | |
1267 | } break; | |
1268 | ||
1269 | case 0x1A: | |
1270 | case 0x1B: { // Chaining command | |
1271 | dynamic_response_info.response[0] = 0xaa | ((receivedCmd[0]) & 1); | |
1272 | dynamic_response_info.response_n = 2; | |
1273 | } break; | |
1274 | ||
1275 | case 0xaa: | |
1276 | case 0xbb: { | |
1277 | dynamic_response_info.response[0] = receivedCmd[0] ^ 0x11; | |
1278 | dynamic_response_info.response_n = 2; | |
1279 | } break; | |
1280 | ||
7838f4be | 1281 | case 0xBA: { // ping / pong |
1282 | dynamic_response_info.response[0] = 0xAB; | |
1283 | dynamic_response_info.response[1] = 0x00; | |
1284 | dynamic_response_info.response_n = 2; | |
7bc95e2e | 1285 | } break; |
1286 | ||
1287 | case 0xCA: | |
1288 | case 0xC2: { // Readers sends deselect command | |
7838f4be | 1289 | dynamic_response_info.response[0] = 0xCA; |
1290 | dynamic_response_info.response[1] = 0x00; | |
1291 | dynamic_response_info.response_n = 2; | |
7bc95e2e | 1292 | } break; |
1293 | ||
1294 | default: { | |
1295 | // Never seen this command before | |
810f5379 | 1296 | LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 1297 | Dbprintf("Received unknown command (len=%d):",len); |
1298 | Dbhexdump(len,receivedCmd,false); | |
1299 | // Do not respond | |
1300 | dynamic_response_info.response_n = 0; | |
1301 | } break; | |
1302 | } | |
ce02f6f9 | 1303 | |
7bc95e2e | 1304 | if (dynamic_response_info.response_n > 0) { |
1305 | // Copy the CID from the reader query | |
1306 | dynamic_response_info.response[1] = receivedCmd[1]; | |
ce02f6f9 | 1307 | |
7bc95e2e | 1308 | // Add CRC bytes, always used in ISO 14443A-4 compliant cards |
1309 | AppendCrc14443a(dynamic_response_info.response,dynamic_response_info.response_n); | |
1310 | dynamic_response_info.response_n += 2; | |
ce02f6f9 | 1311 | |
7bc95e2e | 1312 | if (prepare_tag_modulation(&dynamic_response_info,DYNAMIC_MODULATION_BUFFER_SIZE) == false) { |
1313 | Dbprintf("Error preparing tag response"); | |
810f5379 | 1314 | LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 1315 | break; |
1316 | } | |
1317 | p_response = &dynamic_response_info; | |
1318 | } | |
81cd0474 | 1319 | } |
15c4dc5a | 1320 | |
1321 | // Count number of wakeups received after a halt | |
1322 | if(order == 6 && lastorder == 5) { happened++; } | |
1323 | ||
1324 | // Count number of other messages after a halt | |
1325 | if(order != 6 && lastorder == 5) { happened2++; } | |
1326 | ||
91c7a7cc | 1327 | // comment this limit if you want to simulation longer |
15c4dc5a | 1328 | if(cmdsRecvd > 999) { |
1329 | DbpString("1000 commands later..."); | |
254b70a4 | 1330 | break; |
15c4dc5a | 1331 | } |
ce02f6f9 | 1332 | cmdsRecvd++; |
1333 | ||
1334 | if (p_response != NULL) { | |
7bc95e2e | 1335 | EmSendCmd14443aRaw(p_response->modulation, p_response->modulation_n, receivedCmd[0] == 0x52); |
1336 | // do the tracing for the previous reader request and this tag answer: | |
810f5379 | 1337 | uint8_t par[MAX_PARITY_SIZE] = {0x00}; |
6a1f2d82 | 1338 | GetParity(p_response->response, p_response->response_n, par); |
3fe4ff4f | 1339 | |
7bc95e2e | 1340 | EmLogTrace(Uart.output, |
1341 | Uart.len, | |
1342 | Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, | |
1343 | Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, | |
6a1f2d82 | 1344 | Uart.parity, |
7bc95e2e | 1345 | p_response->response, |
1346 | p_response->response_n, | |
1347 | LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG, | |
1348 | (LastTimeProxToAirStart + p_response->ProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG, | |
6a1f2d82 | 1349 | par); |
7bc95e2e | 1350 | } |
91c7a7cc | 1351 | |
1352 | // comment this limit if you want to simulation longer | |
7bc95e2e | 1353 | if (!tracing) { |
1354 | Dbprintf("Trace Full. Simulation stopped."); | |
1355 | break; | |
1356 | } | |
1357 | } | |
15c4dc5a | 1358 | |
d26849d4 | 1359 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); |
5ee53a0e | 1360 | set_tracing(FALSE); |
f71f4deb | 1361 | BigBuf_free_keep_EM(); |
c9216a92 | 1362 | LED_A_OFF(); |
1363 | ||
0de8e387 | 1364 | if (MF_DBGLEVEL >= 4){ |
5ee53a0e | 1365 | Dbprintf("-[ Wake ups after halt [%d]", happened); |
1366 | Dbprintf("-[ Messages after halt [%d]", happened2); | |
1367 | Dbprintf("-[ Num of received cmd [%d]", cmdsRecvd); | |
0de8e387 | 1368 | } |
15c4dc5a | 1369 | } |
1370 | ||
9492e0b0 | 1371 | |
1372 | // prepare a delayed transfer. This simply shifts ToSend[] by a number | |
1373 | // of bits specified in the delay parameter. | |
1374 | void PrepareDelayedTransfer(uint16_t delay) | |
1375 | { | |
7504dc50 | 1376 | delay &= 0x07; |
1377 | if (!delay) return; | |
1378 | ||
9492e0b0 | 1379 | uint8_t bitmask = 0; |
1380 | uint8_t bits_to_shift = 0; | |
1381 | uint8_t bits_shifted = 0; | |
7504dc50 | 1382 | uint16_t i = 0; |
1383 | ||
1384 | for (i = 0; i < delay; ++i) | |
1385 | bitmask |= (0x01 << i); | |
2285d9dd | 1386 | |
6fc68747 | 1387 | ToSend[++ToSendMax] = 0x00; |
7504dc50 | 1388 | |
1389 | for (i = 0; i < ToSendMax; ++i) { | |
9492e0b0 | 1390 | bits_to_shift = ToSend[i] & bitmask; |
1391 | ToSend[i] = ToSend[i] >> delay; | |
1392 | ToSend[i] = ToSend[i] | (bits_shifted << (8 - delay)); | |
1393 | bits_shifted = bits_to_shift; | |
1394 | } | |
1395 | } | |
9492e0b0 | 1396 | |
7bc95e2e | 1397 | |
1398 | //------------------------------------------------------------------------------------- | |
15c4dc5a | 1399 | // Transmit the command (to the tag) that was placed in ToSend[]. |
9492e0b0 | 1400 | // Parameter timing: |
7bc95e2e | 1401 | // if NULL: transfer at next possible time, taking into account |
1402 | // request guard time and frame delay time | |
1403 | // if == 0: transfer immediately and return time of transfer | |
9492e0b0 | 1404 | // if != 0: delay transfer until time specified |
7bc95e2e | 1405 | //------------------------------------------------------------------------------------- |
6a1f2d82 | 1406 | static void TransmitFor14443a(const uint8_t *cmd, uint16_t len, uint32_t *timing) |
15c4dc5a | 1407 | { |
9492e0b0 | 1408 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); |
e30c654b | 1409 | |
7bc95e2e | 1410 | uint32_t ThisTransferTime = 0; |
e30c654b | 1411 | |
9492e0b0 | 1412 | if (timing) { |
ca5bad3d | 1413 | if(*timing == 0) { // Measure time |
7bc95e2e | 1414 | *timing = (GetCountSspClk() + 8) & 0xfffffff8; |
ca5bad3d | 1415 | } else { |
1416 | PrepareDelayedTransfer(*timing & 0x00000007); // Delay transfer (fine tuning - up to 7 MF clock ticks) | |
1417 | } | |
1418 | if(MF_DBGLEVEL >= 4 && GetCountSspClk() >= (*timing & 0xfffffff8)) Dbprintf("TransmitFor14443a: Missed timing"); | |
1419 | while(GetCountSspClk() < (*timing & 0xfffffff8)); // Delay transfer (multiple of 8 MF clock ticks) | |
7bc95e2e | 1420 | LastTimeProxToAirStart = *timing; |
1421 | } else { | |
1422 | ThisTransferTime = ((MAX(NextTransferTime, GetCountSspClk()) & 0xfffffff8) + 8); | |
7504dc50 | 1423 | |
7bc95e2e | 1424 | while(GetCountSspClk() < ThisTransferTime); |
7504dc50 | 1425 | |
7bc95e2e | 1426 | LastTimeProxToAirStart = ThisTransferTime; |
9492e0b0 | 1427 | } |
1428 | ||
7bc95e2e | 1429 | // clear TXRDY |
1430 | AT91C_BASE_SSC->SSC_THR = SEC_Y; | |
1431 | ||
7bc95e2e | 1432 | uint16_t c = 0; |
9492e0b0 | 1433 | for(;;) { |
1434 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { | |
1435 | AT91C_BASE_SSC->SSC_THR = cmd[c]; | |
4c0cf2d2 | 1436 | ++c; |
5ebcb867 | 1437 | if(c >= len) |
9492e0b0 | 1438 | break; |
9492e0b0 | 1439 | } |
1440 | } | |
7bc95e2e | 1441 | |
1442 | NextTransferTime = MAX(NextTransferTime, LastTimeProxToAirStart + REQUEST_GUARD_TIME); | |
15c4dc5a | 1443 | } |
1444 | ||
7bc95e2e | 1445 | |
15c4dc5a | 1446 | //----------------------------------------------------------------------------- |
195af472 | 1447 | // Prepare reader command (in bits, support short frames) to send to FPGA |
15c4dc5a | 1448 | //----------------------------------------------------------------------------- |
6a1f2d82 | 1449 | void CodeIso14443aBitsAsReaderPar(const uint8_t *cmd, uint16_t bits, const uint8_t *parity) |
15c4dc5a | 1450 | { |
7bc95e2e | 1451 | int i, j; |
5ebcb867 | 1452 | int last = 0; |
7bc95e2e | 1453 | uint8_t b; |
e30c654b | 1454 | |
7bc95e2e | 1455 | ToSendReset(); |
e30c654b | 1456 | |
7bc95e2e | 1457 | // Start of Communication (Seq. Z) |
1458 | ToSend[++ToSendMax] = SEC_Z; | |
1459 | LastProxToAirDuration = 8 * (ToSendMax+1) - 6; | |
7bc95e2e | 1460 | |
1461 | size_t bytecount = nbytes(bits); | |
1462 | // Generate send structure for the data bits | |
1463 | for (i = 0; i < bytecount; i++) { | |
1464 | // Get the current byte to send | |
1465 | b = cmd[i]; | |
1466 | size_t bitsleft = MIN((bits-(i*8)),8); | |
1467 | ||
1468 | for (j = 0; j < bitsleft; j++) { | |
1469 | if (b & 1) { | |
1470 | // Sequence X | |
1471 | ToSend[++ToSendMax] = SEC_X; | |
1472 | LastProxToAirDuration = 8 * (ToSendMax+1) - 2; | |
1473 | last = 1; | |
1474 | } else { | |
1475 | if (last == 0) { | |
1476 | // Sequence Z | |
1477 | ToSend[++ToSendMax] = SEC_Z; | |
1478 | LastProxToAirDuration = 8 * (ToSendMax+1) - 6; | |
1479 | } else { | |
1480 | // Sequence Y | |
1481 | ToSend[++ToSendMax] = SEC_Y; | |
1482 | last = 0; | |
1483 | } | |
1484 | } | |
1485 | b >>= 1; | |
1486 | } | |
1487 | ||
6a1f2d82 | 1488 | // Only transmit parity bit if we transmitted a complete byte |
0ec548dc | 1489 | if (j == 8 && parity != NULL) { |
7bc95e2e | 1490 | // Get the parity bit |
6a1f2d82 | 1491 | if (parity[i>>3] & (0x80 >> (i&0x0007))) { |
7bc95e2e | 1492 | // Sequence X |
1493 | ToSend[++ToSendMax] = SEC_X; | |
1494 | LastProxToAirDuration = 8 * (ToSendMax+1) - 2; | |
1495 | last = 1; | |
1496 | } else { | |
1497 | if (last == 0) { | |
1498 | // Sequence Z | |
1499 | ToSend[++ToSendMax] = SEC_Z; | |
1500 | LastProxToAirDuration = 8 * (ToSendMax+1) - 6; | |
1501 | } else { | |
1502 | // Sequence Y | |
1503 | ToSend[++ToSendMax] = SEC_Y; | |
1504 | last = 0; | |
1505 | } | |
1506 | } | |
1507 | } | |
1508 | } | |
e30c654b | 1509 | |
7bc95e2e | 1510 | // End of Communication: Logic 0 followed by Sequence Y |
1511 | if (last == 0) { | |
1512 | // Sequence Z | |
1513 | ToSend[++ToSendMax] = SEC_Z; | |
1514 | LastProxToAirDuration = 8 * (ToSendMax+1) - 6; | |
1515 | } else { | |
1516 | // Sequence Y | |
1517 | ToSend[++ToSendMax] = SEC_Y; | |
1518 | last = 0; | |
1519 | } | |
1520 | ToSend[++ToSendMax] = SEC_Y; | |
e30c654b | 1521 | |
7bc95e2e | 1522 | // Convert to length of command: |
4b78d6b3 | 1523 | ++ToSendMax; |
15c4dc5a | 1524 | } |
1525 | ||
195af472 | 1526 | //----------------------------------------------------------------------------- |
1527 | // Prepare reader command to send to FPGA | |
1528 | //----------------------------------------------------------------------------- | |
6a1f2d82 | 1529 | void CodeIso14443aAsReaderPar(const uint8_t *cmd, uint16_t len, const uint8_t *parity) |
195af472 | 1530 | { |
ca5bad3d | 1531 | CodeIso14443aBitsAsReaderPar(cmd, len*8, parity); |
195af472 | 1532 | } |
1533 | ||
0c8d25eb | 1534 | |
9ca155ba M |
1535 | //----------------------------------------------------------------------------- |
1536 | // Wait for commands from reader | |
1537 | // Stop when button is pressed (return 1) or field was gone (return 2) | |
1538 | // Or return 0 when command is captured | |
1539 | //----------------------------------------------------------------------------- | |
6a1f2d82 | 1540 | static int EmGetCmd(uint8_t *received, uint16_t *len, uint8_t *parity) |
9ca155ba M |
1541 | { |
1542 | *len = 0; | |
1543 | ||
1544 | uint32_t timer = 0, vtime = 0; | |
1545 | int analogCnt = 0; | |
1546 | int analogAVG = 0; | |
1547 | ||
1548 | // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen | |
1549 | // only, since we are receiving, not transmitting). | |
1550 | // Signal field is off with the appropriate LED | |
1551 | LED_D_OFF(); | |
1552 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN); | |
1553 | ||
1554 | // Set ADC to read field strength | |
1555 | AT91C_BASE_ADC->ADC_CR = AT91C_ADC_SWRST; | |
1556 | AT91C_BASE_ADC->ADC_MR = | |
0c8d25eb | 1557 | ADC_MODE_PRESCALE(63) | |
1558 | ADC_MODE_STARTUP_TIME(1) | | |
1559 | ADC_MODE_SAMPLE_HOLD_TIME(15); | |
9ca155ba M |
1560 | AT91C_BASE_ADC->ADC_CHER = ADC_CHANNEL(ADC_CHAN_HF); |
1561 | // start ADC | |
1562 | AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START; | |
1563 | ||
1564 | // Now run a 'software UART' on the stream of incoming samples. | |
6a1f2d82 | 1565 | UartInit(received, parity); |
7bc95e2e | 1566 | |
1567 | // Clear RXRDY: | |
1568 | uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; | |
0c8d25eb | 1569 | |
9ca155ba M |
1570 | for(;;) { |
1571 | WDT_HIT(); | |
1572 | ||
1573 | if (BUTTON_PRESS()) return 1; | |
1574 | ||
1575 | // test if the field exists | |
1576 | if (AT91C_BASE_ADC->ADC_SR & ADC_END_OF_CONVERSION(ADC_CHAN_HF)) { | |
1577 | analogCnt++; | |
1578 | analogAVG += AT91C_BASE_ADC->ADC_CDR[ADC_CHAN_HF]; | |
1579 | AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START; | |
1580 | if (analogCnt >= 32) { | |
0c8d25eb | 1581 | if ((MAX_ADC_HF_VOLTAGE * (analogAVG / analogCnt) >> 10) < MF_MINFIELDV) { |
9ca155ba M |
1582 | vtime = GetTickCount(); |
1583 | if (!timer) timer = vtime; | |
1584 | // 50ms no field --> card to idle state | |
1585 | if (vtime - timer > 50) return 2; | |
1586 | } else | |
1587 | if (timer) timer = 0; | |
1588 | analogCnt = 0; | |
1589 | analogAVG = 0; | |
1590 | } | |
1591 | } | |
7bc95e2e | 1592 | |
9ca155ba | 1593 | // receive and test the miller decoding |
7bc95e2e | 1594 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { |
1595 | b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; | |
1596 | if(MillerDecoding(b, 0)) { | |
1597 | *len = Uart.len; | |
9ca155ba M |
1598 | return 0; |
1599 | } | |
7bc95e2e | 1600 | } |
1601 | ||
9ca155ba M |
1602 | } |
1603 | } | |
1604 | ||
9ca155ba | 1605 | |
6a1f2d82 | 1606 | static int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNeeded) |
7bc95e2e | 1607 | { |
1608 | uint8_t b; | |
1609 | uint16_t i = 0; | |
1610 | uint32_t ThisTransferTime; | |
1611 | ||
9ca155ba M |
1612 | // Modulate Manchester |
1613 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD); | |
7bc95e2e | 1614 | |
1615 | // include correction bit if necessary | |
1616 | if (Uart.parityBits & 0x01) { | |
1617 | correctionNeeded = TRUE; | |
1618 | } | |
1619 | if(correctionNeeded) { | |
9ca155ba M |
1620 | // 1236, so correction bit needed |
1621 | i = 0; | |
7bc95e2e | 1622 | } else { |
1623 | i = 1; | |
9ca155ba | 1624 | } |
7bc95e2e | 1625 | |
d714d3ef | 1626 | // clear receiving shift register and holding register |
7bc95e2e | 1627 | while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)); |
1628 | b = AT91C_BASE_SSC->SSC_RHR; (void) b; | |
1629 | while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)); | |
1630 | b = AT91C_BASE_SSC->SSC_RHR; (void) b; | |
9ca155ba | 1631 | |
7bc95e2e | 1632 | // wait for the FPGA to signal fdt_indicator == 1 (the FPGA is ready to queue new data in its delay line) |
1633 | for (uint16_t j = 0; j < 5; j++) { // allow timeout - better late than never | |
1634 | while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)); | |
1635 | if (AT91C_BASE_SSC->SSC_RHR) break; | |
1636 | } | |
1637 | ||
1638 | while ((ThisTransferTime = GetCountSspClk()) & 0x00000007); | |
1639 | ||
1640 | // Clear TXRDY: | |
1641 | AT91C_BASE_SSC->SSC_THR = SEC_F; | |
1642 | ||
9ca155ba | 1643 | // send cycle |
bb42a03e | 1644 | for(; i < respLen; ) { |
9ca155ba | 1645 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { |
7bc95e2e | 1646 | AT91C_BASE_SSC->SSC_THR = resp[i++]; |
1647 | FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR; | |
9ca155ba | 1648 | } |
7bc95e2e | 1649 | |
17ad0e09 | 1650 | if(BUTTON_PRESS()) break; |
9ca155ba M |
1651 | } |
1652 | ||
7bc95e2e | 1653 | // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again: |
4b78d6b3 | 1654 | uint8_t fpga_queued_bits = FpgaSendQueueDelay >> 3; // twich /8 ?? >>3, |
0c8d25eb | 1655 | for (i = 0; i <= fpga_queued_bits/8 + 1; ) { |
7bc95e2e | 1656 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { |
1657 | AT91C_BASE_SSC->SSC_THR = SEC_F; | |
1658 | FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR; | |
1659 | i++; | |
1660 | } | |
1661 | } | |
0c8d25eb | 1662 | |
7bc95e2e | 1663 | LastTimeProxToAirStart = ThisTransferTime + (correctionNeeded?8:0); |
1664 | ||
9ca155ba M |
1665 | return 0; |
1666 | } | |
1667 | ||
7bc95e2e | 1668 | int EmSend4bitEx(uint8_t resp, bool correctionNeeded){ |
1669 | Code4bitAnswerAsTag(resp); | |
0a39986e | 1670 | int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded); |
7bc95e2e | 1671 | // do the tracing for the previous reader request and this tag answer: |
5ebcb867 | 1672 | uint8_t par[1] = {0x00}; |
6a1f2d82 | 1673 | GetParity(&resp, 1, par); |
7bc95e2e | 1674 | EmLogTrace(Uart.output, |
1675 | Uart.len, | |
1676 | Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, | |
1677 | Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, | |
6a1f2d82 | 1678 | Uart.parity, |
7bc95e2e | 1679 | &resp, |
1680 | 1, | |
1681 | LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG, | |
1682 | (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG, | |
6a1f2d82 | 1683 | par); |
0a39986e | 1684 | return res; |
9ca155ba M |
1685 | } |
1686 | ||
8f51ddb0 | 1687 | int EmSend4bit(uint8_t resp){ |
7bc95e2e | 1688 | return EmSend4bitEx(resp, false); |
8f51ddb0 M |
1689 | } |
1690 | ||
6a1f2d82 | 1691 | int EmSendCmdExPar(uint8_t *resp, uint16_t respLen, bool correctionNeeded, uint8_t *par){ |
7bc95e2e | 1692 | CodeIso14443aAsTagPar(resp, respLen, par); |
8f51ddb0 | 1693 | int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded); |
7bc95e2e | 1694 | // do the tracing for the previous reader request and this tag answer: |
1695 | EmLogTrace(Uart.output, | |
1696 | Uart.len, | |
1697 | Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, | |
1698 | Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, | |
6a1f2d82 | 1699 | Uart.parity, |
7bc95e2e | 1700 | resp, |
1701 | respLen, | |
1702 | LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG, | |
1703 | (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG, | |
6a1f2d82 | 1704 | par); |
8f51ddb0 M |
1705 | return res; |
1706 | } | |
1707 | ||
6a1f2d82 | 1708 | int EmSendCmdEx(uint8_t *resp, uint16_t respLen, bool correctionNeeded){ |
5ebcb867 | 1709 | uint8_t par[MAX_PARITY_SIZE] = {0x00}; |
6a1f2d82 | 1710 | GetParity(resp, respLen, par); |
1711 | return EmSendCmdExPar(resp, respLen, correctionNeeded, par); | |
8f51ddb0 M |
1712 | } |
1713 | ||
6a1f2d82 | 1714 | int EmSendCmd(uint8_t *resp, uint16_t respLen){ |
5ebcb867 | 1715 | uint8_t par[MAX_PARITY_SIZE] = {0x00}; |
6a1f2d82 | 1716 | GetParity(resp, respLen, par); |
1717 | return EmSendCmdExPar(resp, respLen, false, par); | |
8f51ddb0 M |
1718 | } |
1719 | ||
6a1f2d82 | 1720 | int EmSendCmdPar(uint8_t *resp, uint16_t respLen, uint8_t *par){ |
7bc95e2e | 1721 | return EmSendCmdExPar(resp, respLen, false, par); |
1722 | } | |
1723 | ||
6a1f2d82 | 1724 | bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint8_t *reader_Parity, |
1725 | uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint8_t *tag_Parity) | |
7bc95e2e | 1726 | { |
810f5379 | 1727 | // we cannot exactly measure the end and start of a received command from reader. However we know that the delay from |
1728 | // end of the received command to start of the tag's (simulated by us) answer is n*128+20 or n*128+84 resp. | |
1729 | // with n >= 9. The start of the tags answer can be measured and therefore the end of the received command be calculated: | |
1730 | uint16_t reader_modlen = reader_EndTime - reader_StartTime; | |
1731 | uint16_t approx_fdt = tag_StartTime - reader_EndTime; | |
1732 | uint16_t exact_fdt = (approx_fdt - 20 + 32)/64 * 64 + 20; | |
1733 | reader_EndTime = tag_StartTime - exact_fdt; | |
1734 | reader_StartTime = reader_EndTime - reader_modlen; | |
5ebcb867 | 1735 | |
810f5379 | 1736 | if (!LogTrace(reader_data, reader_len, reader_StartTime, reader_EndTime, reader_Parity, TRUE)) |
1737 | return FALSE; | |
1738 | else | |
1739 | return(!LogTrace(tag_data, tag_len, tag_StartTime, tag_EndTime, tag_Parity, FALSE)); | |
1740 | ||
9ca155ba M |
1741 | } |
1742 | ||
15c4dc5a | 1743 | //----------------------------------------------------------------------------- |
1744 | // Wait a certain time for tag response | |
1745 | // If a response is captured return TRUE | |
e691fc45 | 1746 | // If it takes too long return FALSE |
15c4dc5a | 1747 | //----------------------------------------------------------------------------- |
6a1f2d82 | 1748 | static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint8_t *receivedResponsePar, uint16_t offset) |
15c4dc5a | 1749 | { |
46c65fed | 1750 | uint32_t c = 0x00; |
e691fc45 | 1751 | |
15c4dc5a | 1752 | // Set FPGA mode to "reader listen mode", no modulation (listen |
534983d7 | 1753 | // only, since we are receiving, not transmitting). |
1754 | // Signal field is on with the appropriate LED | |
1755 | LED_D_ON(); | |
1756 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN); | |
1c611bbd | 1757 | |
534983d7 | 1758 | // Now get the answer from the card |
6a1f2d82 | 1759 | DemodInit(receivedResponse, receivedResponsePar); |
15c4dc5a | 1760 | |
7bc95e2e | 1761 | // clear RXRDY: |
1762 | uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; | |
0c8d25eb | 1763 | |
15c4dc5a | 1764 | for(;;) { |
534983d7 | 1765 | WDT_HIT(); |
15c4dc5a | 1766 | |
534983d7 | 1767 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { |
534983d7 | 1768 | b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; |
7bc95e2e | 1769 | if(ManchesterDecoding(b, offset, 0)) { |
1770 | NextTransferTime = MAX(NextTransferTime, Demod.endTime - (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/16 + FRAME_DELAY_TIME_PICC_TO_PCD); | |
15c4dc5a | 1771 | return TRUE; |
19a700a8 | 1772 | } else if (c++ > iso14a_timeout && Demod.state == DEMOD_UNSYNCD) { |
7bc95e2e | 1773 | return FALSE; |
15c4dc5a | 1774 | } |
534983d7 | 1775 | } |
1776 | } | |
15c4dc5a | 1777 | } |
1778 | ||
6a1f2d82 | 1779 | void ReaderTransmitBitsPar(uint8_t* frame, uint16_t bits, uint8_t *par, uint32_t *timing) |
15c4dc5a | 1780 | { |
6a1f2d82 | 1781 | CodeIso14443aBitsAsReaderPar(frame, bits, par); |
dfc3c505 | 1782 | |
7bc95e2e | 1783 | // Send command to tag |
1784 | TransmitFor14443a(ToSend, ToSendMax, timing); | |
1785 | if(trigger) | |
1786 | LED_A_ON(); | |
dfc3c505 | 1787 | |
7bc95e2e | 1788 | // Log reader command in trace buffer |
4b78d6b3 | 1789 | //LogTrace(frame, nbytes(bits), LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_READER, (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_READER, par, TRUE); |
1790 | LogTrace(frame, nbytes(bits), (LastTimeProxToAirStart<<4) + DELAY_ARM2AIR_AS_READER, ((LastTimeProxToAirStart + LastProxToAirDuration)<<4) + DELAY_ARM2AIR_AS_READER, par, TRUE); | |
15c4dc5a | 1791 | } |
1792 | ||
6a1f2d82 | 1793 | void ReaderTransmitPar(uint8_t* frame, uint16_t len, uint8_t *par, uint32_t *timing) |
dfc3c505 | 1794 | { |
ca5bad3d | 1795 | ReaderTransmitBitsPar(frame, len*8, par, timing); |
dfc3c505 | 1796 | } |
15c4dc5a | 1797 | |
6a1f2d82 | 1798 | void ReaderTransmitBits(uint8_t* frame, uint16_t len, uint32_t *timing) |
e691fc45 | 1799 | { |
1800 | // Generate parity and redirect | |
5ebcb867 | 1801 | uint8_t par[MAX_PARITY_SIZE] = {0x00}; |
ca5bad3d | 1802 | GetParity(frame, len/8, par); |
6a1f2d82 | 1803 | ReaderTransmitBitsPar(frame, len, par, timing); |
e691fc45 | 1804 | } |
1805 | ||
6a1f2d82 | 1806 | void ReaderTransmit(uint8_t* frame, uint16_t len, uint32_t *timing) |
15c4dc5a | 1807 | { |
1808 | // Generate parity and redirect | |
5ebcb867 | 1809 | uint8_t par[MAX_PARITY_SIZE] = {0x00}; |
6a1f2d82 | 1810 | GetParity(frame, len, par); |
ca5bad3d | 1811 | ReaderTransmitBitsPar(frame, len*8, par, timing); |
15c4dc5a | 1812 | } |
1813 | ||
6a1f2d82 | 1814 | int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t *parity) |
e691fc45 | 1815 | { |
ca5bad3d | 1816 | if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, offset)) return FALSE; |
1817 | //if (tracing) { | |
1818 | LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE); | |
1819 | //} | |
e691fc45 | 1820 | return Demod.len; |
1821 | } | |
1822 | ||
91c7a7cc | 1823 | int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity) { |
ca5bad3d | 1824 | if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, 0)) return FALSE; |
1825 | //if (tracing) { | |
91c7a7cc | 1826 | LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE); |
ca5bad3d | 1827 | //} |
e691fc45 | 1828 | return Demod.len; |
f89c7050 M |
1829 | } |
1830 | ||
c188b1b9 | 1831 | // performs iso14443a anticollision (optional) and card select procedure |
1832 | // fills the uid and cuid pointer unless NULL | |
1833 | // fills the card info record unless NULL | |
1834 | // if anticollision is false, then the UID must be provided in uid_ptr[] | |
1835 | // and num_cascades must be set (1: 4 Byte UID, 2: 7 Byte UID, 3: 10 Byte UID) | |
1836 | int iso14443a_select_card(byte_t *uid_ptr, iso14a_card_select_t *p_hi14a_card, uint32_t *cuid_ptr, bool anticollision, uint8_t num_cascades) { | |
6a1f2d82 | 1837 | uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP |
1838 | uint8_t sel_all[] = { 0x93,0x20 }; | |
1839 | uint8_t sel_uid[] = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00}; | |
1840 | uint8_t rats[] = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0 | |
4c0cf2d2 | 1841 | uint8_t resp[MAX_FRAME_SIZE] = {0}; // theoretically. A usual RATS will be much smaller |
1842 | uint8_t resp_par[MAX_PARITY_SIZE] = {0}; | |
1843 | byte_t uid_resp[4] = {0}; | |
1844 | size_t uid_resp_len = 0; | |
6a1f2d82 | 1845 | |
1846 | uint8_t sak = 0x04; // cascade uid | |
1847 | int cascade_level = 0; | |
1848 | int len; | |
1849 | ||
1850 | // Broadcast for a card, WUPA (0x52) will force response from all cards in the field | |
c188b1b9 | 1851 | ReaderTransmitBitsPar(wupa, 7, NULL, NULL); |
7bc95e2e | 1852 | |
6a1f2d82 | 1853 | // Receive the ATQA |
1854 | if(!ReaderReceive(resp, resp_par)) return 0; | |
6a1f2d82 | 1855 | |
1856 | if(p_hi14a_card) { | |
1857 | memcpy(p_hi14a_card->atqa, resp, 2); | |
1858 | p_hi14a_card->uidlen = 0; | |
1859 | memset(p_hi14a_card->uid,0,10); | |
1860 | } | |
5f6d6c90 | 1861 | |
c188b1b9 | 1862 | if (anticollision) { |
4c0cf2d2 | 1863 | // clear uid |
1864 | if (uid_ptr) | |
1865 | memset(uid_ptr,0,10); | |
c188b1b9 | 1866 | } |
79a73ab2 | 1867 | |
0ec548dc | 1868 | // check for proprietary anticollision: |
4c0cf2d2 | 1869 | if ((resp[0] & 0x1F) == 0) return 3; |
0ec548dc | 1870 | |
6a1f2d82 | 1871 | // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in |
1872 | // which case we need to make a cascade 2 request and select - this is a long UID | |
1873 | // While the UID is not complete, the 3nd bit (from the right) is set in the SAK. | |
1874 | for(; sak & 0x04; cascade_level++) { | |
1875 | // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97) | |
1876 | sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2; | |
1877 | ||
c188b1b9 | 1878 | if (anticollision) { |
6a1f2d82 | 1879 | // SELECT_ALL |
4c0cf2d2 | 1880 | ReaderTransmit(sel_all, sizeof(sel_all), NULL); |
1881 | if (!ReaderReceive(resp, resp_par)) return 0; | |
1882 | ||
1883 | if (Demod.collisionPos) { // we had a collision and need to construct the UID bit by bit | |
1884 | memset(uid_resp, 0, 4); | |
1885 | uint16_t uid_resp_bits = 0; | |
1886 | uint16_t collision_answer_offset = 0; | |
1887 | // anti-collision-loop: | |
1888 | while (Demod.collisionPos) { | |
1889 | Dbprintf("Multiple tags detected. Collision after Bit %d", Demod.collisionPos); | |
1890 | for (uint16_t i = collision_answer_offset; i < Demod.collisionPos; i++, uid_resp_bits++) { // add valid UID bits before collision point | |
1891 | uint16_t UIDbit = (resp[i/8] >> (i % 8)) & 0x01; | |
1892 | uid_resp[uid_resp_bits / 8] |= UIDbit << (uid_resp_bits % 8); | |
1893 | } | |
1894 | uid_resp[uid_resp_bits/8] |= 1 << (uid_resp_bits % 8); // next time select the card(s) with a 1 in the collision position | |
1895 | uid_resp_bits++; | |
1896 | // construct anticollosion command: | |
1897 | sel_uid[1] = ((2 + uid_resp_bits/8) << 4) | (uid_resp_bits & 0x07); // length of data in bytes and bits | |
1898 | for (uint16_t i = 0; i <= uid_resp_bits/8; i++) { | |
1899 | sel_uid[2+i] = uid_resp[i]; | |
1900 | } | |
1901 | collision_answer_offset = uid_resp_bits%8; | |
1902 | ReaderTransmitBits(sel_uid, 16 + uid_resp_bits, NULL); | |
1903 | if (!ReaderReceiveOffset(resp, collision_answer_offset, resp_par)) return 0; | |
6a1f2d82 | 1904 | } |
4c0cf2d2 | 1905 | // finally, add the last bits and BCC of the UID |
1906 | for (uint16_t i = collision_answer_offset; i < (Demod.len-1)*8; i++, uid_resp_bits++) { | |
1907 | uint16_t UIDbit = (resp[i/8] >> (i%8)) & 0x01; | |
1908 | uid_resp[uid_resp_bits/8] |= UIDbit << (uid_resp_bits % 8); | |
6a1f2d82 | 1909 | } |
e691fc45 | 1910 | |
4c0cf2d2 | 1911 | } else { // no collision, use the response to SELECT_ALL as current uid |
1912 | memcpy(uid_resp, resp, 4); | |
1913 | } | |
1914 | ||
c188b1b9 | 1915 | } else { |
1916 | if (cascade_level < num_cascades - 1) { | |
1917 | uid_resp[0] = 0x88; | |
1918 | memcpy(uid_resp+1, uid_ptr+cascade_level*3, 3); | |
1919 | } else { | |
1920 | memcpy(uid_resp, uid_ptr+cascade_level*3, 4); | |
1921 | } | |
1922 | } | |
6a1f2d82 | 1923 | uid_resp_len = 4; |
5f6d6c90 | 1924 | |
6a1f2d82 | 1925 | // calculate crypto UID. Always use last 4 Bytes. |
4c0cf2d2 | 1926 | if(cuid_ptr) |
6a1f2d82 | 1927 | *cuid_ptr = bytes_to_num(uid_resp, 4); |
e30c654b | 1928 | |
6a1f2d82 | 1929 | // Construct SELECT UID command |
1930 | sel_uid[1] = 0x70; // transmitting a full UID (1 Byte cmd, 1 Byte NVB, 4 Byte UID, 1 Byte BCC, 2 Bytes CRC) | |
c188b1b9 | 1931 | memcpy(sel_uid+2, uid_resp, 4); // the UID received during anticollision, or the provided UID |
6a1f2d82 | 1932 | sel_uid[6] = sel_uid[2] ^ sel_uid[3] ^ sel_uid[4] ^ sel_uid[5]; // calculate and add BCC |
1933 | AppendCrc14443a(sel_uid, 7); // calculate and add CRC | |
1934 | ReaderTransmit(sel_uid, sizeof(sel_uid), NULL); | |
1935 | ||
1936 | // Receive the SAK | |
1937 | if (!ReaderReceive(resp, resp_par)) return 0; | |
4c0cf2d2 | 1938 | |
6a1f2d82 | 1939 | sak = resp[0]; |
1940 | ||
810f5379 | 1941 | // Test if more parts of the uid are coming |
6a1f2d82 | 1942 | if ((sak & 0x04) /* && uid_resp[0] == 0x88 */) { |
1943 | // Remove first byte, 0x88 is not an UID byte, it CT, see page 3 of: | |
1944 | // http://www.nxp.com/documents/application_note/AN10927.pdf | |
6a1f2d82 | 1945 | uid_resp[0] = uid_resp[1]; |
1946 | uid_resp[1] = uid_resp[2]; | |
1947 | uid_resp[2] = uid_resp[3]; | |
6a1f2d82 | 1948 | uid_resp_len = 3; |
1949 | } | |
5f6d6c90 | 1950 | |
4c0cf2d2 | 1951 | if(uid_ptr && anticollision) |
6a1f2d82 | 1952 | memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len); |
5f6d6c90 | 1953 | |
6a1f2d82 | 1954 | if(p_hi14a_card) { |
1955 | memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len); | |
1956 | p_hi14a_card->uidlen += uid_resp_len; | |
1957 | } | |
1958 | } | |
79a73ab2 | 1959 | |
6a1f2d82 | 1960 | if(p_hi14a_card) { |
1961 | p_hi14a_card->sak = sak; | |
1962 | p_hi14a_card->ats_len = 0; | |
1963 | } | |
534983d7 | 1964 | |
3fe4ff4f | 1965 | // non iso14443a compliant tag |
1966 | if( (sak & 0x20) == 0) return 2; | |
534983d7 | 1967 | |
6a1f2d82 | 1968 | // Request for answer to select |
1969 | AppendCrc14443a(rats, 2); | |
1970 | ReaderTransmit(rats, sizeof(rats), NULL); | |
1c611bbd | 1971 | |
6a1f2d82 | 1972 | if (!(len = ReaderReceive(resp, resp_par))) return 0; |
3fe4ff4f | 1973 | |
6a1f2d82 | 1974 | if(p_hi14a_card) { |
1975 | memcpy(p_hi14a_card->ats, resp, sizeof(p_hi14a_card->ats)); | |
1976 | p_hi14a_card->ats_len = len; | |
1977 | } | |
5f6d6c90 | 1978 | |
6a1f2d82 | 1979 | // reset the PCB block number |
1980 | iso14_pcb_blocknum = 0; | |
19a700a8 | 1981 | |
1982 | // set default timeout based on ATS | |
1983 | iso14a_set_ATS_timeout(resp); | |
1984 | ||
6a1f2d82 | 1985 | return 1; |
7e758047 | 1986 | } |
15c4dc5a | 1987 | |
7bc95e2e | 1988 | void iso14443a_setup(uint8_t fpga_minor_mode) { |
7cc204bf | 1989 | FpgaDownloadAndGo(FPGA_BITSTREAM_HF); |
9492e0b0 | 1990 | // Set up the synchronous serial port |
1991 | FpgaSetupSsc(); | |
7bc95e2e | 1992 | // connect Demodulated Signal to ADC: |
7e758047 | 1993 | SetAdcMuxFor(GPIO_MUXSEL_HIPKD); |
91c7a7cc | 1994 | |
1995 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | fpga_minor_mode); | |
ca5bad3d | 1996 | |
1997 | LED_D_OFF(); | |
7e758047 | 1998 | // Signal field is on with the appropriate LED |
ca5bad3d | 1999 | if (fpga_minor_mode == FPGA_HF_ISO14443A_READER_MOD || |
2000 | fpga_minor_mode == FPGA_HF_ISO14443A_READER_LISTEN) | |
7bc95e2e | 2001 | LED_D_ON(); |
6fc68747 | 2002 | |
91c7a7cc | 2003 | // Prepare the demodulation functions |
7bc95e2e | 2004 | DemodReset(); |
2005 | UartReset(); | |
6fc68747 | 2006 | |
46c65fed | 2007 | iso14a_set_timeout(10*106); // 10ms default |
91c7a7cc | 2008 | |
2009 | //NextTransferTime = 2 * DELAY_ARM2AIR_AS_READER; | |
2010 | NextTransferTime = DELAY_ARM2AIR_AS_READER << 1; | |
6fc68747 | 2011 | |
2012 | // Start the timer | |
2013 | StartCountSspClk(); | |
7e758047 | 2014 | } |
15c4dc5a | 2015 | |
6a1f2d82 | 2016 | int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) { |
810f5379 | 2017 | uint8_t parity[MAX_PARITY_SIZE] = {0x00}; |
534983d7 | 2018 | uint8_t real_cmd[cmd_len+4]; |
2019 | real_cmd[0] = 0x0a; //I-Block | |
b0127e65 | 2020 | // put block number into the PCB |
2021 | real_cmd[0] |= iso14_pcb_blocknum; | |
534983d7 | 2022 | real_cmd[1] = 0x00; //CID: 0 //FIXME: allow multiple selected cards |
2023 | memcpy(real_cmd+2, cmd, cmd_len); | |
2024 | AppendCrc14443a(real_cmd,cmd_len+2); | |
2025 | ||
9492e0b0 | 2026 | ReaderTransmit(real_cmd, cmd_len+4, NULL); |
6a1f2d82 | 2027 | size_t len = ReaderReceive(data, parity); |
ca5bad3d | 2028 | //DATA LINK ERROR |
2029 | if (!len) return 0; | |
2030 | ||
6a1f2d82 | 2031 | uint8_t *data_bytes = (uint8_t *) data; |
ca5bad3d | 2032 | |
b0127e65 | 2033 | // if we received an I- or R(ACK)-Block with a block number equal to the |
2034 | // current block number, toggle the current block number | |
ca5bad3d | 2035 | if (len >= 4 // PCB+CID+CRC = 4 bytes |
b0127e65 | 2036 | && ((data_bytes[0] & 0xC0) == 0 // I-Block |
2037 | || (data_bytes[0] & 0xD0) == 0x80) // R-Block with ACK bit set to 0 | |
2038 | && (data_bytes[0] & 0x01) == iso14_pcb_blocknum) // equal block numbers | |
2039 | { | |
2040 | iso14_pcb_blocknum ^= 1; | |
2041 | } | |
2042 | ||
534983d7 | 2043 | return len; |
2044 | } | |
2045 | ||
7e758047 | 2046 | //----------------------------------------------------------------------------- |
2047 | // Read an ISO 14443a tag. Send out commands and store answers. | |
2048 | // | |
2049 | //----------------------------------------------------------------------------- | |
91c7a7cc | 2050 | void ReaderIso14443a(UsbCommand *c) { |
534983d7 | 2051 | iso14a_command_t param = c->arg[0]; |
04bc1c66 | 2052 | size_t len = c->arg[1] & 0xffff; |
2053 | size_t lenbits = c->arg[1] >> 16; | |
2054 | uint32_t timeout = c->arg[2]; | |
91c7a7cc | 2055 | uint8_t *cmd = c->d.asBytes; |
9492e0b0 | 2056 | uint32_t arg0 = 0; |
810f5379 | 2057 | byte_t buf[USB_CMD_DATA_SIZE] = {0x00}; |
2058 | uint8_t par[MAX_PARITY_SIZE] = {0x00}; | |
902cb3c0 | 2059 | |
810f5379 | 2060 | if (param & ISO14A_CONNECT) |
3000dc4e | 2061 | clear_trace(); |
e691fc45 | 2062 | |
3000dc4e | 2063 | set_tracing(TRUE); |
e30c654b | 2064 | |
810f5379 | 2065 | if (param & ISO14A_REQUEST_TRIGGER) |
7bc95e2e | 2066 | iso14a_set_trigger(TRUE); |
15c4dc5a | 2067 | |
810f5379 | 2068 | if (param & ISO14A_CONNECT) { |
7bc95e2e | 2069 | iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); |
5f6d6c90 | 2070 | if(!(param & ISO14A_NO_SELECT)) { |
2071 | iso14a_card_select_t *card = (iso14a_card_select_t*)buf; | |
c188b1b9 | 2072 | arg0 = iso14443a_select_card(NULL,card,NULL, true, 0); |
91c7a7cc | 2073 | cmd_send(CMD_ACK, arg0, card->uidlen, 0, buf, sizeof(iso14a_card_select_t)); |
6fc68747 | 2074 | // if it fails, the cmdhf14a.c client quites.. however this one still executes. |
2075 | if ( arg0 == 0 ) return; | |
5f6d6c90 | 2076 | } |
534983d7 | 2077 | } |
e30c654b | 2078 | |
810f5379 | 2079 | if (param & ISO14A_SET_TIMEOUT) |
04bc1c66 | 2080 | iso14a_set_timeout(timeout); |
e30c654b | 2081 | |
810f5379 | 2082 | if (param & ISO14A_APDU) { |
902cb3c0 | 2083 | arg0 = iso14_apdu(cmd, len, buf); |
79a73ab2 | 2084 | cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf)); |
534983d7 | 2085 | } |
e30c654b | 2086 | |
810f5379 | 2087 | if (param & ISO14A_RAW) { |
534983d7 | 2088 | if(param & ISO14A_APPEND_CRC) { |
0ec548dc | 2089 | if(param & ISO14A_TOPAZMODE) { |
2090 | AppendCrc14443b(cmd,len); | |
2091 | } else { | |
d26849d4 | 2092 | AppendCrc14443a(cmd,len); |
0ec548dc | 2093 | } |
534983d7 | 2094 | len += 2; |
c7324bef | 2095 | if (lenbits) lenbits += 16; |
15c4dc5a | 2096 | } |
0ec548dc | 2097 | if(lenbits>0) { // want to send a specific number of bits (e.g. short commands) |
2098 | if(param & ISO14A_TOPAZMODE) { | |
2099 | int bits_to_send = lenbits; | |
2100 | uint16_t i = 0; | |
2101 | ReaderTransmitBitsPar(&cmd[i++], MIN(bits_to_send, 7), NULL, NULL); // first byte is always short (7bits) and no parity | |
2102 | bits_to_send -= 7; | |
2103 | while (bits_to_send > 0) { | |
2104 | ReaderTransmitBitsPar(&cmd[i++], MIN(bits_to_send, 8), NULL, NULL); // following bytes are 8 bit and no parity | |
2105 | bits_to_send -= 8; | |
2106 | } | |
2107 | } else { | |
6a1f2d82 | 2108 | GetParity(cmd, lenbits/8, par); |
0ec548dc | 2109 | ReaderTransmitBitsPar(cmd, lenbits, par, NULL); // bytes are 8 bit with odd parity |
2110 | } | |
2111 | } else { // want to send complete bytes only | |
2112 | if(param & ISO14A_TOPAZMODE) { | |
2113 | uint16_t i = 0; | |
2114 | ReaderTransmitBitsPar(&cmd[i++], 7, NULL, NULL); // first byte: 7 bits, no paritiy | |
2115 | while (i < len) { | |
2116 | ReaderTransmitBitsPar(&cmd[i++], 8, NULL, NULL); // following bytes: 8 bits, no paritiy | |
2117 | } | |
5f6d6c90 | 2118 | } else { |
0ec548dc | 2119 | ReaderTransmit(cmd,len, NULL); // 8 bits, odd parity |
2120 | } | |
5f6d6c90 | 2121 | } |
6a1f2d82 | 2122 | arg0 = ReaderReceive(buf, par); |
9492e0b0 | 2123 | cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf)); |
534983d7 | 2124 | } |
15c4dc5a | 2125 | |
810f5379 | 2126 | if (param & ISO14A_REQUEST_TRIGGER) |
7bc95e2e | 2127 | iso14a_set_trigger(FALSE); |
15c4dc5a | 2128 | |
810f5379 | 2129 | if (param & ISO14A_NO_DISCONNECT) |
534983d7 | 2130 | return; |
15c4dc5a | 2131 | |
15c4dc5a | 2132 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); |
5ee53a0e | 2133 | set_tracing(FALSE); |
15c4dc5a | 2134 | LEDsoff(); |
15c4dc5a | 2135 | } |
b0127e65 | 2136 | |
1c611bbd | 2137 | |
1c611bbd | 2138 | // Determine the distance between two nonces. |
2139 | // Assume that the difference is small, but we don't know which is first. | |
2140 | // Therefore try in alternating directions. | |
2141 | int32_t dist_nt(uint32_t nt1, uint32_t nt2) { | |
2142 | ||
ca5bad3d | 2143 | if (nt1 == nt2) return 0; |
ca5bad3d | 2144 | |
91c7a7cc | 2145 | uint16_t i; |
2146 | uint32_t nttmp1 = nt1; | |
2147 | uint32_t nttmp2 = nt2; | |
2148 | ||
2149 | for (i = 1; i < 32768; ++i) { | |
ca5bad3d | 2150 | nttmp1 = prng_successor(nttmp1, 1); |
2151 | if (nttmp1 == nt2) return i; | |
2152 | nttmp2 = prng_successor(nttmp2, 1); | |
2153 | if (nttmp2 == nt1) return -i; | |
91c7a7cc | 2154 | } |
2155 | // either nt1 or nt2 are invalid nonces | |
2156 | return(-99999); | |
e772353f | 2157 | } |
2158 | ||
e772353f | 2159 | |
1c611bbd | 2160 | //----------------------------------------------------------------------------- |
2161 | // Recover several bits of the cypher stream. This implements (first stages of) | |
2162 | // the algorithm described in "The Dark Side of Security by Obscurity and | |
2163 | // Cloning MiFare Classic Rail and Building Passes, Anywhere, Anytime" | |
2164 | // (article by Nicolas T. Courtois, 2009) | |
2165 | //----------------------------------------------------------------------------- | |
91c7a7cc | 2166 | void ReaderMifare(bool first_try, uint8_t block ) { |
c830303d | 2167 | // Mifare AUTH |
810f5379 | 2168 | //uint8_t mf_auth[] = { 0x60,0x00,0xf5,0x7b }; |
2169 | //uint8_t mf_auth[] = { 0x60,0x05, 0x58, 0x2c }; | |
91c7a7cc | 2170 | uint8_t mf_auth[] = { MIFARE_AUTH_KEYA, block, 0x00, 0x00 }; |
b0300679 | 2171 | uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }; |
2172 | uint8_t uid[10] = {0,0,0,0,0,0,0,0,0,0}; | |
2173 | uint8_t par_list[8] = {0,0,0,0,0,0,0,0}; | |
2174 | uint8_t ks_list[8] = {0,0,0,0,0,0,0,0}; | |
495d7f13 | 2175 | uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE] = {0x00}; |
2176 | uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE] = {0x00}; | |
b0300679 | 2177 | uint8_t par[1] = {0}; // maximum 8 Bytes to be sent here, 1 byte parity is therefore enough |
1c611bbd | 2178 | byte_t nt_diff = 0; |
6a1f2d82 | 2179 | uint32_t nt = 0; |
b0300679 | 2180 | uint32_t previous_nt = 0; |
b0300679 | 2181 | uint32_t cuid = 0; |
2182 | ||
91c7a7cc | 2183 | int32_t catch_up_cycles = 0; |
2184 | int32_t last_catch_up = 0; | |
2185 | int32_t isOK = 0; | |
2186 | int32_t nt_distance = 0; | |
b0300679 | 2187 | |
4c0cf2d2 | 2188 | uint16_t elapsed_prng_sequences = 1; |
1c611bbd | 2189 | uint16_t consecutive_resyncs = 0; |
0de8e387 | 2190 | uint16_t unexpected_random = 0; |
2191 | uint16_t sync_tries = 0; | |
b0300679 | 2192 | |
91c7a7cc | 2193 | // static variables here, is re-used in the next call? |
b0300679 | 2194 | static uint32_t nt_attacked = 0; |
2195 | static uint32_t sync_time = 0; | |
91c7a7cc | 2196 | static uint32_t sync_cycles = 0; |
b0300679 | 2197 | static uint8_t par_low = 0; |
2198 | static uint8_t mf_nr_ar3 = 0; | |
91c7a7cc | 2199 | |
b0300679 | 2200 | #define PRNG_SEQUENCE_LENGTH (1 << 16) |
2201 | #define MAX_UNEXPECTED_RANDOM 4 // maximum number of unexpected (i.e. real) random numbers when trying to sync. Then give up. | |
2202 | #define MAX_SYNC_TRIES 32 | |
2203 | #define MAX_STRATEGY 3 | |
4c0cf2d2 | 2204 | |
91c7a7cc | 2205 | BigBuf_free(); BigBuf_Clear_ext(false); |
4b78d6b3 | 2206 | clear_trace(); |
91c7a7cc | 2207 | set_tracing(TRUE); |
2208 | iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD); | |
4c0cf2d2 | 2209 | |
91c7a7cc | 2210 | AppendCrc14443a(mf_auth, 2); |
2211 | ||
4c0cf2d2 | 2212 | if (first_try) { |
2213 | sync_time = GetCountSspClk() & 0xfffffff8; | |
91c7a7cc | 2214 | sync_cycles = PRNG_SEQUENCE_LENGTH + 1130; //65536; //0x10000 // Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces). |
4c0cf2d2 | 2215 | mf_nr_ar3 = 0; |
2216 | nt_attacked = 0; | |
91c7a7cc | 2217 | par_low = 0; |
b0300679 | 2218 | |
91c7a7cc | 2219 | Dbprintf("FIRST: sync_time - %08X", sync_time); |
4c0cf2d2 | 2220 | } else { |
b0300679 | 2221 | // we were unsuccessful on a previous call. |
2222 | // Try another READER nonce (first 3 parity bits remain the same) | |
2223 | ++mf_nr_ar3; | |
4c0cf2d2 | 2224 | mf_nr_ar[3] = mf_nr_ar3; |
2225 | par[0] = par_low; | |
2226 | } | |
91c7a7cc | 2227 | |
2228 | bool have_uid = FALSE; | |
2229 | uint8_t cascade_levels = 0; | |
2230 | ||
4c0cf2d2 | 2231 | LED_C_ON(); |
91c7a7cc | 2232 | uint16_t i; |
2233 | for(i = 0; TRUE; ++i) { | |
4c0cf2d2 | 2234 | |
1c611bbd | 2235 | WDT_HIT(); |
e30c654b | 2236 | |
1c611bbd | 2237 | // Test if the action was cancelled |
c830303d | 2238 | if(BUTTON_PRESS()) { |
2239 | isOK = -1; | |
1c611bbd | 2240 | break; |
2241 | } | |
2242 | ||
91c7a7cc | 2243 | // this part is from Piwi's faster nonce collecting part in Hardnested. |
2244 | if (!have_uid) { // need a full select cycle to get the uid first | |
2245 | iso14a_card_select_t card_info; | |
2246 | if(!iso14443a_select_card(uid, &card_info, &cuid, true, 0)) { | |
2247 | if (MF_DBGLEVEL >= 4) Dbprintf("Mifare: Can't select card (ALL)"); | |
2248 | break; | |
2249 | } | |
2250 | switch (card_info.uidlen) { | |
2251 | case 4 : cascade_levels = 1; break; | |
2252 | case 7 : cascade_levels = 2; break; | |
2253 | case 10: cascade_levels = 3; break; | |
2254 | default: break; | |
2255 | } | |
2256 | have_uid = TRUE; | |
2257 | } else { // no need for anticollision. We can directly select the card | |
2258 | if(!iso14443a_select_card(uid, NULL, &cuid, false, cascade_levels)) { | |
2259 | if (MF_DBGLEVEL >= 4) Dbprintf("Mifare: Can't select card (UID)"); | |
2260 | continue; | |
2261 | } | |
1c611bbd | 2262 | } |
4c0cf2d2 | 2263 | |
91c7a7cc | 2264 | // Sending timeslot of ISO14443a frame |
2265 | sync_time = (sync_time & 0xfffffff8 ) + sync_cycles + catch_up_cycles; | |
4b78d6b3 | 2266 | catch_up_cycles = 0; |
2267 | ||
2268 | // if we missed the sync time already, advance to the next nonce repeat | |
91c7a7cc | 2269 | while( GetCountSspClk() > sync_time) { |
4b78d6b3 | 2270 | ++elapsed_prng_sequences; |
91c7a7cc | 2271 | sync_time = (sync_time & 0xfffffff8 ) + sync_cycles; |
2272 | } | |
2273 | ||
2274 | // Transmit MIFARE_CLASSIC_AUTH at synctime. Should result in returning the same tag nonce (== nt_attacked) | |
2275 | ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time); | |
f89c7050 | 2276 | |
91c7a7cc | 2277 | // Receive the (4 Byte) "random" nonce from TAG |
4c0cf2d2 | 2278 | if (!ReaderReceive(receivedAnswer, receivedAnswerPar)) |
1c611bbd | 2279 | continue; |
1c611bbd | 2280 | |
4b78d6b3 | 2281 | previous_nt = nt; |
2282 | nt = bytes_to_num(receivedAnswer, 4); | |
2283 | ||
91c7a7cc | 2284 | // Transmit reader nonce with fake par |
2285 | ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par, NULL); | |
2286 | ||
2287 | WDT_HIT(); | |
2288 | LED_B_ON(); | |
1c611bbd | 2289 | if (first_try && previous_nt && !nt_attacked) { // we didn't calibrate our clock yet |
91c7a7cc | 2290 | |
2291 | nt_distance = dist_nt(previous_nt, nt); | |
2292 | ||
2293 | // if no distance between, then we are in sync. | |
1c611bbd | 2294 | if (nt_distance == 0) { |
2295 | nt_attacked = nt; | |
0de8e387 | 2296 | } else { |
c830303d | 2297 | if (nt_distance == -99999) { // invalid nonce received |
91c7a7cc | 2298 | ++unexpected_random; |
3bc7b13d | 2299 | if (unexpected_random > MAX_UNEXPECTED_RANDOM) { |
c830303d | 2300 | isOK = -3; // Card has an unpredictable PRNG. Give up |
2301 | break; | |
91c7a7cc | 2302 | } else { |
2303 | if (sync_cycles <= 0) sync_cycles += PRNG_SEQUENCE_LENGTH; | |
2304 | LED_B_OFF(); | |
c830303d | 2305 | continue; // continue trying... |
2306 | } | |
1c611bbd | 2307 | } |
4c0cf2d2 | 2308 | |
0de8e387 | 2309 | if (++sync_tries > MAX_SYNC_TRIES) { |
91c7a7cc | 2310 | isOK = -4; // Card's PRNG runs at an unexpected frequency or resets unexpectedly |
2311 | break; | |
0de8e387 | 2312 | } |
4c0cf2d2 | 2313 | |
4b78d6b3 | 2314 | sync_cycles = (sync_cycles - nt_distance)/elapsed_prng_sequences; |
91c7a7cc | 2315 | |
4c0cf2d2 | 2316 | if (sync_cycles <= 0) |
0de8e387 | 2317 | sync_cycles += PRNG_SEQUENCE_LENGTH; |
4c0cf2d2 | 2318 | |
91c7a7cc | 2319 | if (MF_DBGLEVEL >= 4) |
3bc7b13d | 2320 | Dbprintf("calibrating in cycle %d. nt_distance=%d, elapsed_prng_sequences=%d, new sync_cycles: %d\n", i, nt_distance, elapsed_prng_sequences, sync_cycles); |
4c0cf2d2 | 2321 | |
91c7a7cc | 2322 | LED_B_OFF(); |
1c611bbd | 2323 | continue; |
2324 | } | |
2325 | } | |
91c7a7cc | 2326 | LED_B_OFF(); |
1c611bbd | 2327 | |
2328 | if ((nt != nt_attacked) && nt_attacked) { // we somehow lost sync. Try to catch up again... | |
4c0cf2d2 | 2329 | |
91c7a7cc | 2330 | catch_up_cycles = ABS(dist_nt(nt_attacked, nt)); |
c830303d | 2331 | if (catch_up_cycles == 99999) { // invalid nonce received. Don't resync on that one. |
1c611bbd | 2332 | catch_up_cycles = 0; |
2333 | continue; | |
91c7a7cc | 2334 | } |
4c0cf2d2 | 2335 | // average? |
3bc7b13d | 2336 | catch_up_cycles /= elapsed_prng_sequences; |
4c0cf2d2 | 2337 | |
1c611bbd | 2338 | if (catch_up_cycles == last_catch_up) { |
4a71da5a | 2339 | ++consecutive_resyncs; |
4c0cf2d2 | 2340 | } else { |
1c611bbd | 2341 | last_catch_up = catch_up_cycles; |
2342 | consecutive_resyncs = 0; | |
4b78d6b3 | 2343 | } |
4c0cf2d2 | 2344 | |
1c611bbd | 2345 | if (consecutive_resyncs < 3) { |
91c7a7cc | 2346 | if (MF_DBGLEVEL >= 4) |
2347 | Dbprintf("Lost sync in cycle %d. nt_distance=%d. Consecutive Resyncs = %d. Trying one time catch up...\n", i, catch_up_cycles, consecutive_resyncs); | |
4c0cf2d2 | 2348 | } else { |
2349 | sync_cycles += catch_up_cycles; | |
2350 | ||
91c7a7cc | 2351 | if (MF_DBGLEVEL >= 4) |
2352 | 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); | |
4c0cf2d2 | 2353 | |
3bc7b13d | 2354 | last_catch_up = 0; |
2355 | catch_up_cycles = 0; | |
2356 | consecutive_resyncs = 0; | |
1c611bbd | 2357 | } |
2358 | continue; | |
2359 | } | |
2360 | ||
1c611bbd | 2361 | // Receive answer. This will be a 4 Bit NACK when the 8 parity bits are OK after decoding |
91c7a7cc | 2362 | if (ReaderReceive(receivedAnswer, receivedAnswerPar)) { |
9492e0b0 | 2363 | catch_up_cycles = 8; // the PRNG is delayed by 8 cycles due to the NAC (4Bits = 0x05 encrypted) transfer |
1c611bbd | 2364 | |
495d7f13 | 2365 | if (nt_diff == 0) |
6a1f2d82 | 2366 | 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 | 2367 | |
6a1f2d82 | 2368 | par_list[nt_diff] = SwapBits(par[0], 8); |
91c7a7cc | 2369 | ks_list[nt_diff] = receivedAnswer[0] ^ 0x05; // xor with NACK value to get keystream |
1c611bbd | 2370 | |
2371 | // Test if the information is complete | |
2372 | if (nt_diff == 0x07) { | |
2373 | isOK = 1; | |
2374 | break; | |
2375 | } | |
2376 | ||
2377 | nt_diff = (nt_diff + 1) & 0x07; | |
2378 | mf_nr_ar[3] = (mf_nr_ar[3] & 0x1F) | (nt_diff << 5); | |
6a1f2d82 | 2379 | par[0] = par_low; |
4b78d6b3 | 2380 | |
1c611bbd | 2381 | } else { |
b0300679 | 2382 | // No NACK. |
495d7f13 | 2383 | if (nt_diff == 0 && first_try) { |
6a1f2d82 | 2384 | par[0]++; |
5ebcb867 | 2385 | if (par[0] == 0x00) { // tried all 256 possible parities without success. Card doesn't send NACK. |
c830303d | 2386 | isOK = -2; |
2387 | break; | |
2388 | } | |
1c611bbd | 2389 | } else { |
b0300679 | 2390 | // Why this? |
6a1f2d82 | 2391 | par[0] = ((par[0] & 0x1F) + 1) | par_low; |
1c611bbd | 2392 | } |
2393 | } | |
4b78d6b3 | 2394 | |
91c7a7cc | 2395 | // reset the resyncs since we got a complete transaction on right time. |
4b78d6b3 | 2396 | consecutive_resyncs = 0; |
91c7a7cc | 2397 | } // end for loop |
1c611bbd | 2398 | |
1c611bbd | 2399 | mf_nr_ar[3] &= 0x1F; |
5ebcb867 | 2400 | |
91c7a7cc | 2401 | if (MF_DBGLEVEL >= 1) Dbprintf("\nNumber of sent auth requestes: %u", i); |
d26849d4 | 2402 | |
b0300679 | 2403 | uint8_t buf[28] = {0x00}; |
91c7a7cc | 2404 | memset(buf, 0x00, sizeof(buf)); |
b0300679 | 2405 | num_to_bytes(cuid, 4, buf); |
1c611bbd | 2406 | num_to_bytes(nt, 4, buf + 4); |
2407 | memcpy(buf + 8, par_list, 8); | |
2408 | memcpy(buf + 16, ks_list, 8); | |
2409 | memcpy(buf + 24, mf_nr_ar, 4); | |
2410 | ||
91c7a7cc | 2411 | cmd_send(CMD_ACK, isOK, 0, 0, buf, sizeof(buf) ); |
1c611bbd | 2412 | |
1c611bbd | 2413 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); |
2414 | LEDsoff(); | |
99cf19d9 | 2415 | set_tracing(FALSE); |
20f9a2a1 | 2416 | } |
1c611bbd | 2417 | |
0de8e387 | 2418 | /** |
d2f487af | 2419 | *MIFARE 1K simulate. |
2420 | * | |
2421 | *@param flags : | |
2422 | * FLAG_INTERACTIVE - In interactive mode, we are expected to finish the operation with an ACK | |
2423 | * 4B_FLAG_UID_IN_DATA - means that there is a 4-byte UID in the data-section, we're expected to use that | |
2424 | * 7B_FLAG_UID_IN_DATA - means that there is a 7-byte UID in the data-section, we're expected to use that | |
2425 | * FLAG_NR_AR_ATTACK - means we should collect NR_AR responses for bruteforcing later | |
2426 | *@param exitAfterNReads, exit simulation after n blocks have been read, 0 is inifite | |
2427 | */ | |
91c7a7cc | 2428 | void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *datain) { |
50193c1e | 2429 | int cardSTATE = MFEMUL_NOFIELD; |
8556b852 | 2430 | int _7BUID = 0; |
9ca155ba | 2431 | int vHf = 0; // in mV |
8f51ddb0 | 2432 | int res; |
0a39986e M |
2433 | uint32_t selTimer = 0; |
2434 | uint32_t authTimer = 0; | |
6a1f2d82 | 2435 | uint16_t len = 0; |
8f51ddb0 | 2436 | uint8_t cardWRBL = 0; |
9ca155ba M |
2437 | uint8_t cardAUTHSC = 0; |
2438 | uint8_t cardAUTHKEY = 0xff; // no authentication | |
c3c241f3 | 2439 | // uint32_t cardRr = 0; |
9ca155ba | 2440 | uint32_t cuid = 0; |
d2f487af | 2441 | //uint32_t rn_enc = 0; |
51969283 | 2442 | uint32_t ans = 0; |
0014cb46 M |
2443 | uint32_t cardINTREG = 0; |
2444 | uint8_t cardINTBLOCK = 0; | |
9ca155ba M |
2445 | struct Crypto1State mpcs = {0, 0}; |
2446 | struct Crypto1State *pcs; | |
2447 | pcs = &mpcs; | |
d2f487af | 2448 | uint32_t numReads = 0;//Counts numer of times reader read a block |
5ebcb867 | 2449 | uint8_t receivedCmd[MAX_MIFARE_FRAME_SIZE] = {0x00}; |
2450 | uint8_t receivedCmd_par[MAX_MIFARE_PARITY_SIZE] = {0x00}; | |
2451 | uint8_t response[MAX_MIFARE_FRAME_SIZE] = {0x00}; | |
2452 | uint8_t response_par[MAX_MIFARE_PARITY_SIZE] = {0x00}; | |
9ca155ba | 2453 | |
d2f487af | 2454 | uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID |
2455 | uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; | |
2456 | uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; // !!! | |
94422fa2 | 2457 | uint8_t rSAK[] = {0x08, 0xb6, 0xdd}; // Mifare Classic |
2458 | //uint8_t rSAK[] = {0x09, 0x3f, 0xcc }; // Mifare Mini | |
d2f487af | 2459 | uint8_t rSAK1[] = {0x04, 0xda, 0x17}; |
9ca155ba | 2460 | |
02a40596 | 2461 | //uint8_t rAUTH_NT[] = {0x01, 0x01, 0x01, 0x01}; |
2462 | uint8_t rAUTH_NT[] = {0x55, 0x41, 0x49, 0x92}; | |
d2f487af | 2463 | uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00}; |
7bc95e2e | 2464 | |
2b1f4228 | 2465 | //Here, we collect UID1,UID2,NT,AR,NR,0,0,NT2,AR2,NR2 |
d2f487af | 2466 | // This can be used in a reader-only attack. |
2467 | // (it can also be retrieved via 'hf 14a list', but hey... | |
c3c241f3 | 2468 | uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0,0,0}; |
d2f487af | 2469 | uint8_t ar_nr_collected = 0; |
0014cb46 | 2470 | |
7bc95e2e | 2471 | // Authenticate response - nonce |
51969283 | 2472 | uint32_t nonce = bytes_to_num(rAUTH_NT, 4); |
7bc95e2e | 2473 | |
d2f487af | 2474 | //-- Determine the UID |
2475 | // Can be set from emulator memory, incoming data | |
2476 | // and can be 7 or 4 bytes long | |
7bc95e2e | 2477 | if (flags & FLAG_4B_UID_IN_DATA) |
d2f487af | 2478 | { |
2479 | // 4B uid comes from data-portion of packet | |
2480 | memcpy(rUIDBCC1,datain,4); | |
8556b852 | 2481 | rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; |
8556b852 | 2482 | |
7bc95e2e | 2483 | } else if (flags & FLAG_7B_UID_IN_DATA) { |
d2f487af | 2484 | // 7B uid comes from data-portion of packet |
2485 | memcpy(&rUIDBCC1[1],datain,3); | |
2486 | memcpy(rUIDBCC2, datain+3, 4); | |
2487 | _7BUID = true; | |
7bc95e2e | 2488 | } else { |
d2f487af | 2489 | // get UID from emul memory |
2490 | emlGetMemBt(receivedCmd, 7, 1); | |
2491 | _7BUID = !(receivedCmd[0] == 0x00); | |
2492 | if (!_7BUID) { // ---------- 4BUID | |
2493 | emlGetMemBt(rUIDBCC1, 0, 4); | |
2494 | } else { // ---------- 7BUID | |
2495 | emlGetMemBt(&rUIDBCC1[1], 0, 3); | |
2496 | emlGetMemBt(rUIDBCC2, 3, 4); | |
2497 | } | |
2498 | } | |
7bc95e2e | 2499 | |
c3c241f3 | 2500 | // save uid. |
2501 | ar_nr_responses[0*5] = bytes_to_num(rUIDBCC1+1, 3); | |
2502 | if ( _7BUID ) | |
2503 | ar_nr_responses[0*5+1] = bytes_to_num(rUIDBCC2, 4); | |
2504 | ||
d2f487af | 2505 | /* |
2506 | * Regardless of what method was used to set the UID, set fifth byte and modify | |
2507 | * the ATQA for 4 or 7-byte UID | |
2508 | */ | |
d2f487af | 2509 | rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; |
7bc95e2e | 2510 | if (_7BUID) { |
d2f487af | 2511 | rATQA[0] = 0x44; |
8556b852 | 2512 | rUIDBCC1[0] = 0x88; |
d26849d4 | 2513 | rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; |
8556b852 M |
2514 | rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3]; |
2515 | } | |
2516 | ||
d2f487af | 2517 | if (MF_DBGLEVEL >= 1) { |
2518 | if (!_7BUID) { | |
b03c0f2d | 2519 | Dbprintf("4B UID: %02x%02x%02x%02x", |
2520 | rUIDBCC1[0], rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3]); | |
7bc95e2e | 2521 | } else { |
b03c0f2d | 2522 | Dbprintf("7B UID: (%02x)%02x%02x%02x%02x%02x%02x%02x", |
2523 | rUIDBCC1[0], rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3], | |
2524 | rUIDBCC2[0], rUIDBCC2[1] ,rUIDBCC2[2], rUIDBCC2[3]); | |
d2f487af | 2525 | } |
2526 | } | |
7bc95e2e | 2527 | |
99cf19d9 | 2528 | // We need to listen to the high-frequency, peak-detected path. |
2529 | iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN); | |
2530 | ||
2531 | // free eventually allocated BigBuf memory but keep Emulator Memory | |
2532 | BigBuf_free_keep_EM(); | |
2533 | ||
2534 | // clear trace | |
2535 | clear_trace(); | |
2536 | set_tracing(TRUE); | |
2537 | ||
2538 | ||
7bc95e2e | 2539 | bool finished = FALSE; |
2b1f4228 | 2540 | while (!BUTTON_PRESS() && !finished && !usb_poll_validate_length()) { |
9ca155ba | 2541 | WDT_HIT(); |
9ca155ba M |
2542 | |
2543 | // find reader field | |
9ca155ba | 2544 | if (cardSTATE == MFEMUL_NOFIELD) { |
0c8d25eb | 2545 | vHf = (MAX_ADC_HF_VOLTAGE * AvgAdc(ADC_CHAN_HF)) >> 10; |
9ca155ba | 2546 | if (vHf > MF_MINFIELDV) { |
0014cb46 | 2547 | cardSTATE_TO_IDLE(); |
9ca155ba M |
2548 | LED_A_ON(); |
2549 | } | |
2550 | } | |
d2f487af | 2551 | if(cardSTATE == MFEMUL_NOFIELD) continue; |
9ca155ba | 2552 | |
d2f487af | 2553 | //Now, get data |
6a1f2d82 | 2554 | res = EmGetCmd(receivedCmd, &len, receivedCmd_par); |
d2f487af | 2555 | if (res == 2) { //Field is off! |
2556 | cardSTATE = MFEMUL_NOFIELD; | |
2557 | LEDsoff(); | |
2558 | continue; | |
7bc95e2e | 2559 | } else if (res == 1) { |
2560 | break; //return value 1 means button press | |
2561 | } | |
2562 | ||
d2f487af | 2563 | // REQ or WUP request in ANY state and WUP in HALTED state |
2564 | if (len == 1 && ((receivedCmd[0] == 0x26 && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == 0x52)) { | |
2565 | selTimer = GetTickCount(); | |
2566 | EmSendCmdEx(rATQA, sizeof(rATQA), (receivedCmd[0] == 0x52)); | |
2567 | cardSTATE = MFEMUL_SELECT1; | |
2568 | ||
2569 | // init crypto block | |
2570 | LED_B_OFF(); | |
2571 | LED_C_OFF(); | |
2572 | crypto1_destroy(pcs); | |
2573 | cardAUTHKEY = 0xff; | |
2574 | continue; | |
0a39986e | 2575 | } |
7bc95e2e | 2576 | |
50193c1e | 2577 | switch (cardSTATE) { |
d2f487af | 2578 | case MFEMUL_NOFIELD: |
2579 | case MFEMUL_HALTED: | |
50193c1e | 2580 | case MFEMUL_IDLE:{ |
6a1f2d82 | 2581 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
50193c1e M |
2582 | break; |
2583 | } | |
2584 | case MFEMUL_SELECT1:{ | |
9ca155ba M |
2585 | // select all |
2586 | if (len == 2 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x20)) { | |
d2f487af | 2587 | if (MF_DBGLEVEL >= 4) Dbprintf("SELECT ALL received"); |
9ca155ba | 2588 | EmSendCmd(rUIDBCC1, sizeof(rUIDBCC1)); |
0014cb46 | 2589 | break; |
9ca155ba M |
2590 | } |
2591 | ||
d2f487af | 2592 | if (MF_DBGLEVEL >= 4 && len == 9 && receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 ) |
2593 | { | |
2594 | Dbprintf("SELECT %02x%02x%02x%02x received",receivedCmd[2],receivedCmd[3],receivedCmd[4],receivedCmd[5]); | |
2595 | } | |
9ca155ba | 2596 | // select card |
0a39986e M |
2597 | if (len == 9 && |
2598 | (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) { | |
bfb6a143 | 2599 | EmSendCmd(_7BUID?rSAK1:rSAK, _7BUID?sizeof(rSAK1):sizeof(rSAK)); |
9ca155ba | 2600 | cuid = bytes_to_num(rUIDBCC1, 4); |
8556b852 M |
2601 | if (!_7BUID) { |
2602 | cardSTATE = MFEMUL_WORK; | |
0014cb46 M |
2603 | LED_B_ON(); |
2604 | if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol1 time: %d", GetTickCount() - selTimer); | |
2605 | break; | |
8556b852 M |
2606 | } else { |
2607 | cardSTATE = MFEMUL_SELECT2; | |
8556b852 | 2608 | } |
9ca155ba | 2609 | } |
50193c1e M |
2610 | break; |
2611 | } | |
d2f487af | 2612 | case MFEMUL_AUTH1:{ |
495d7f13 | 2613 | if( len != 8) { |
d2f487af | 2614 | cardSTATE_TO_IDLE(); |
6a1f2d82 | 2615 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
d2f487af | 2616 | break; |
2617 | } | |
0c8d25eb | 2618 | |
d2f487af | 2619 | uint32_t ar = bytes_to_num(receivedCmd, 4); |
6a1f2d82 | 2620 | uint32_t nr = bytes_to_num(&receivedCmd[4], 4); |
d2f487af | 2621 | |
2622 | //Collect AR/NR | |
46cd801c | 2623 | //if(ar_nr_collected < 2 && cardAUTHSC == 2){ |
495d7f13 | 2624 | if(ar_nr_collected < 2) { |
2625 | if(ar_nr_responses[2] != ar) { | |
2626 | // Avoid duplicates... probably not necessary, ar should vary. | |
c3c241f3 | 2627 | //ar_nr_responses[ar_nr_collected*5] = 0; |
2628 | //ar_nr_responses[ar_nr_collected*5+1] = 0; | |
2629 | ar_nr_responses[ar_nr_collected*5+2] = nonce; | |
2630 | ar_nr_responses[ar_nr_collected*5+3] = nr; | |
2631 | ar_nr_responses[ar_nr_collected*5+4] = ar; | |
273b57a7 | 2632 | ar_nr_collected++; |
12d708fe | 2633 | } |
2634 | // Interactive mode flag, means we need to send ACK | |
2635 | if(flags & FLAG_INTERACTIVE && ar_nr_collected == 2) | |
12d708fe | 2636 | finished = true; |
d2f487af | 2637 | } |
2638 | ||
2639 | // --- crypto | |
c3c241f3 | 2640 | //crypto1_word(pcs, ar , 1); |
2641 | //cardRr = nr ^ crypto1_word(pcs, 0, 0); | |
2642 | ||
2643 | //test if auth OK | |
2644 | //if (cardRr != prng_successor(nonce, 64)){ | |
2645 | ||
2646 | //if (MF_DBGLEVEL >= 4) Dbprintf("AUTH FAILED for sector %d with key %c. cardRr=%08x, succ=%08x", | |
2647 | // cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B', | |
2648 | // cardRr, prng_successor(nonce, 64)); | |
7bc95e2e | 2649 | // Shouldn't we respond anything here? |
d2f487af | 2650 | // Right now, we don't nack or anything, which causes the |
2651 | // reader to do a WUPA after a while. /Martin | |
b03c0f2d | 2652 | // -- which is the correct response. /piwi |
c3c241f3 | 2653 | //cardSTATE_TO_IDLE(); |
2654 | //LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); | |
2655 | //break; | |
2656 | //} | |
d2f487af | 2657 | |
2658 | ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0); | |
2659 | ||
2660 | num_to_bytes(ans, 4, rAUTH_AT); | |
2661 | // --- crypto | |
2662 | EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); | |
2663 | LED_C_ON(); | |
2664 | cardSTATE = MFEMUL_WORK; | |
495d7f13 | 2665 | if (MF_DBGLEVEL >= 4) { |
2666 | Dbprintf("AUTH COMPLETED for sector %d with key %c. time=%d", | |
2667 | cardAUTHSC, | |
2668 | cardAUTHKEY == 0 ? 'A' : 'B', | |
2669 | GetTickCount() - authTimer | |
2670 | ); | |
2671 | } | |
d2f487af | 2672 | break; |
2673 | } | |
50193c1e | 2674 | case MFEMUL_SELECT2:{ |
7bc95e2e | 2675 | if (!len) { |
6a1f2d82 | 2676 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 2677 | break; |
2678 | } | |
8556b852 | 2679 | if (len == 2 && (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x20)) { |
9ca155ba | 2680 | EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2)); |
8556b852 M |
2681 | break; |
2682 | } | |
9ca155ba | 2683 | |
8556b852 M |
2684 | // select 2 card |
2685 | if (len == 9 && | |
495d7f13 | 2686 | (receivedCmd[0] == 0x95 && |
2687 | receivedCmd[1] == 0x70 && | |
2688 | memcmp(&receivedCmd[2], rUIDBCC2, 4) == 0) ) { | |
8556b852 | 2689 | EmSendCmd(rSAK, sizeof(rSAK)); |
8556b852 M |
2690 | cuid = bytes_to_num(rUIDBCC2, 4); |
2691 | cardSTATE = MFEMUL_WORK; | |
2692 | LED_B_ON(); | |
0014cb46 | 2693 | if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol2 time: %d", GetTickCount() - selTimer); |
8556b852 M |
2694 | break; |
2695 | } | |
0014cb46 M |
2696 | |
2697 | // i guess there is a command). go into the work state. | |
7bc95e2e | 2698 | if (len != 4) { |
6a1f2d82 | 2699 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 2700 | break; |
2701 | } | |
0014cb46 | 2702 | cardSTATE = MFEMUL_WORK; |
d2f487af | 2703 | //goto lbWORK; |
2704 | //intentional fall-through to the next case-stmt | |
50193c1e | 2705 | } |
51969283 | 2706 | |
7bc95e2e | 2707 | case MFEMUL_WORK:{ |
2708 | if (len == 0) { | |
6a1f2d82 | 2709 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 2710 | break; |
2711 | } | |
2712 | ||
d2f487af | 2713 | bool encrypted_data = (cardAUTHKEY != 0xFF) ; |
2714 | ||
495d7f13 | 2715 | // decrypt seqence |
2716 | if(encrypted_data) | |
51969283 | 2717 | mf_crypto1_decrypt(pcs, receivedCmd, len); |
7bc95e2e | 2718 | |
d2f487af | 2719 | if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) { |
2720 | authTimer = GetTickCount(); | |
2721 | cardAUTHSC = receivedCmd[1] / 4; // received block num | |
2722 | cardAUTHKEY = receivedCmd[0] - 0x60; | |
2723 | crypto1_destroy(pcs);//Added by martin | |
2724 | crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY)); | |
51969283 | 2725 | |
d2f487af | 2726 | if (!encrypted_data) { // first authentication |
b03c0f2d | 2727 | if (MF_DBGLEVEL >= 4) Dbprintf("Reader authenticating for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY ); |
51969283 | 2728 | |
d2f487af | 2729 | crypto1_word(pcs, cuid ^ nonce, 0);//Update crypto state |
2730 | num_to_bytes(nonce, 4, rAUTH_AT); // Send nonce | |
7bc95e2e | 2731 | } else { // nested authentication |
b03c0f2d | 2732 | if (MF_DBGLEVEL >= 4) Dbprintf("Reader doing nested authentication for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY ); |
7bc95e2e | 2733 | ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); |
d2f487af | 2734 | num_to_bytes(ans, 4, rAUTH_AT); |
2735 | } | |
0c8d25eb | 2736 | |
d2f487af | 2737 | EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); |
2738 | //Dbprintf("Sending rAUTH %02x%02x%02x%02x", rAUTH_AT[0],rAUTH_AT[1],rAUTH_AT[2],rAUTH_AT[3]); | |
2739 | cardSTATE = MFEMUL_AUTH1; | |
2740 | break; | |
51969283 | 2741 | } |
7bc95e2e | 2742 | |
8f51ddb0 M |
2743 | // rule 13 of 7.5.3. in ISO 14443-4. chaining shall be continued |
2744 | // BUT... ACK --> NACK | |
2745 | if (len == 1 && receivedCmd[0] == CARD_ACK) { | |
2746 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); | |
2747 | break; | |
2748 | } | |
2749 | ||
2750 | // rule 12 of 7.5.3. in ISO 14443-4. R(NAK) --> R(ACK) | |
2751 | if (len == 1 && receivedCmd[0] == CARD_NACK_NA) { | |
2752 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); | |
2753 | break; | |
0a39986e M |
2754 | } |
2755 | ||
7bc95e2e | 2756 | if(len != 4) { |
6a1f2d82 | 2757 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
7bc95e2e | 2758 | break; |
2759 | } | |
d2f487af | 2760 | |
2761 | if(receivedCmd[0] == 0x30 // read block | |
2762 | || receivedCmd[0] == 0xA0 // write block | |
b03c0f2d | 2763 | || receivedCmd[0] == 0xC0 // inc |
2764 | || receivedCmd[0] == 0xC1 // dec | |
2765 | || receivedCmd[0] == 0xC2 // restore | |
7bc95e2e | 2766 | || receivedCmd[0] == 0xB0) { // transfer |
2767 | if (receivedCmd[1] >= 16 * 4) { | |
d2f487af | 2768 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); |
c3c241f3 | 2769 | if (MF_DBGLEVEL >= 4) Dbprintf("Reader tried to operate (0x%02) on out of range block: %d (0x%02x), nacking",receivedCmd[0],receivedCmd[1],receivedCmd[1]); |
d2f487af | 2770 | break; |
2771 | } | |
2772 | ||
7bc95e2e | 2773 | if (receivedCmd[1] / 4 != cardAUTHSC) { |
8f51ddb0 | 2774 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); |
c3c241f3 | 2775 | if (MF_DBGLEVEL >= 4) Dbprintf("Reader tried to operate (0x%02) on block (0x%02x) not authenticated for (0x%02x), nacking",receivedCmd[0],receivedCmd[1],cardAUTHSC); |
8f51ddb0 M |
2776 | break; |
2777 | } | |
d2f487af | 2778 | } |
2779 | // read block | |
2780 | if (receivedCmd[0] == 0x30) { | |
495d7f13 | 2781 | if (MF_DBGLEVEL >= 4) Dbprintf("Reader reading block %d (0x%02x)",receivedCmd[1],receivedCmd[1]); |
2782 | ||
8f51ddb0 M |
2783 | emlGetMem(response, receivedCmd[1], 1); |
2784 | AppendCrc14443a(response, 16); | |
6a1f2d82 | 2785 | mf_crypto1_encrypt(pcs, response, 18, response_par); |
2786 | EmSendCmdPar(response, 18, response_par); | |
d2f487af | 2787 | numReads++; |
12d708fe | 2788 | if(exitAfterNReads > 0 && numReads >= exitAfterNReads) { |
d2f487af | 2789 | Dbprintf("%d reads done, exiting", numReads); |
2790 | finished = true; | |
2791 | } | |
0a39986e M |
2792 | break; |
2793 | } | |
0a39986e | 2794 | // write block |
d2f487af | 2795 | if (receivedCmd[0] == 0xA0) { |
b03c0f2d | 2796 | if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0xA0 write block %d (%02x)",receivedCmd[1],receivedCmd[1]); |
8f51ddb0 | 2797 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); |
8f51ddb0 M |
2798 | cardSTATE = MFEMUL_WRITEBL2; |
2799 | cardWRBL = receivedCmd[1]; | |
0a39986e | 2800 | break; |
7bc95e2e | 2801 | } |
0014cb46 | 2802 | // increment, decrement, restore |
d2f487af | 2803 | if (receivedCmd[0] == 0xC0 || receivedCmd[0] == 0xC1 || receivedCmd[0] == 0xC2) { |
b03c0f2d | 2804 | if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]); |
d2f487af | 2805 | if (emlCheckValBl(receivedCmd[1])) { |
c3c241f3 | 2806 | if (MF_DBGLEVEL >= 4) Dbprintf("Reader tried to operate on block, but emlCheckValBl failed, nacking"); |
0014cb46 M |
2807 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); |
2808 | break; | |
2809 | } | |
2810 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); | |
2811 | if (receivedCmd[0] == 0xC1) | |
2812 | cardSTATE = MFEMUL_INTREG_INC; | |
2813 | if (receivedCmd[0] == 0xC0) | |
2814 | cardSTATE = MFEMUL_INTREG_DEC; | |
2815 | if (receivedCmd[0] == 0xC2) | |
2816 | cardSTATE = MFEMUL_INTREG_REST; | |
2817 | cardWRBL = receivedCmd[1]; | |
0014cb46 M |
2818 | break; |
2819 | } | |
0014cb46 | 2820 | // transfer |
d2f487af | 2821 | if (receivedCmd[0] == 0xB0) { |
b03c0f2d | 2822 | if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x transfer block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]); |
0014cb46 M |
2823 | if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd[1])) |
2824 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); | |
2825 | else | |
2826 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); | |
0014cb46 M |
2827 | break; |
2828 | } | |
9ca155ba | 2829 | // halt |
d2f487af | 2830 | if (receivedCmd[0] == 0x50 && receivedCmd[1] == 0x00) { |
9ca155ba | 2831 | LED_B_OFF(); |
0a39986e | 2832 | LED_C_OFF(); |
0014cb46 M |
2833 | cardSTATE = MFEMUL_HALTED; |
2834 | if (MF_DBGLEVEL >= 4) Dbprintf("--> HALTED. Selected time: %d ms", GetTickCount() - selTimer); | |
6a1f2d82 | 2835 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
0a39986e | 2836 | break; |
9ca155ba | 2837 | } |
d2f487af | 2838 | // RATS |
2839 | if (receivedCmd[0] == 0xe0) {//RATS | |
8f51ddb0 M |
2840 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); |
2841 | break; | |
2842 | } | |
d2f487af | 2843 | // command not allowed |
2844 | if (MF_DBGLEVEL >= 4) Dbprintf("Received command not allowed, nacking"); | |
2845 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); | |
51969283 | 2846 | break; |
8f51ddb0 M |
2847 | } |
2848 | case MFEMUL_WRITEBL2:{ | |
495d7f13 | 2849 | if (len == 18) { |
8f51ddb0 M |
2850 | mf_crypto1_decrypt(pcs, receivedCmd, len); |
2851 | emlSetMem(receivedCmd, cardWRBL, 1); | |
2852 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); | |
2853 | cardSTATE = MFEMUL_WORK; | |
51969283 | 2854 | } else { |
0014cb46 | 2855 | cardSTATE_TO_IDLE(); |
6a1f2d82 | 2856 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
8f51ddb0 | 2857 | } |
8f51ddb0 | 2858 | break; |
50193c1e | 2859 | } |
0014cb46 M |
2860 | |
2861 | case MFEMUL_INTREG_INC:{ | |
2862 | mf_crypto1_decrypt(pcs, receivedCmd, len); | |
2863 | memcpy(&ans, receivedCmd, 4); | |
2864 | if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) { | |
2865 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); | |
2866 | cardSTATE_TO_IDLE(); | |
2867 | break; | |
7bc95e2e | 2868 | } |
6a1f2d82 | 2869 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
0014cb46 M |
2870 | cardINTREG = cardINTREG + ans; |
2871 | cardSTATE = MFEMUL_WORK; | |
2872 | break; | |
2873 | } | |
2874 | case MFEMUL_INTREG_DEC:{ | |
2875 | mf_crypto1_decrypt(pcs, receivedCmd, len); | |
2876 | memcpy(&ans, receivedCmd, 4); | |
2877 | if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) { | |
2878 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); | |
2879 | cardSTATE_TO_IDLE(); | |
2880 | break; | |
2881 | } | |
6a1f2d82 | 2882 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
0014cb46 M |
2883 | cardINTREG = cardINTREG - ans; |
2884 | cardSTATE = MFEMUL_WORK; | |
2885 | break; | |
2886 | } | |
2887 | case MFEMUL_INTREG_REST:{ | |
2888 | mf_crypto1_decrypt(pcs, receivedCmd, len); | |
2889 | memcpy(&ans, receivedCmd, 4); | |
2890 | if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) { | |
2891 | EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); | |
2892 | cardSTATE_TO_IDLE(); | |
2893 | break; | |
2894 | } | |
6a1f2d82 | 2895 | LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE); |
0014cb46 M |
2896 | cardSTATE = MFEMUL_WORK; |
2897 | break; | |
2898 | } | |
50193c1e | 2899 | } |
50193c1e M |
2900 | } |
2901 | ||
810f5379 | 2902 | // Interactive mode flag, means we need to send ACK |
2903 | if(flags & FLAG_INTERACTIVE) { | |
d2f487af | 2904 | //May just aswell send the collected ar_nr in the response aswell |
c3c241f3 | 2905 | uint8_t len = ar_nr_collected*5*4; |
2906 | cmd_send(CMD_ACK, CMD_SIMULATE_MIFARE_CARD, len, 0, &ar_nr_responses, len); | |
d2f487af | 2907 | } |
d714d3ef | 2908 | |
810f5379 | 2909 | if(flags & FLAG_NR_AR_ATTACK && MF_DBGLEVEL >= 1 ) { |
12d708fe | 2910 | if(ar_nr_collected > 1 ) { |
d2f487af | 2911 | Dbprintf("Collected two pairs of AR/NR which can be used to extract keys from reader:"); |
c3c241f3 | 2912 | Dbprintf("../tools/mfkey/mfkey32 %06x%08x %08x %08x %08x %08x %08x", |
2913 | ar_nr_responses[0], // UID1 | |
2914 | ar_nr_responses[1], // UID2 | |
2915 | ar_nr_responses[2], // NT | |
2916 | ar_nr_responses[3], // AR1 | |
2917 | ar_nr_responses[4], // NR1 | |
2918 | ar_nr_responses[8], // AR2 | |
2919 | ar_nr_responses[9] // NR2 | |
d2f487af | 2920 | ); |
7838f4be | 2921 | Dbprintf("../tools/mfkey/mfkey32v2 %06x%08x %08x %08x %08x %08x %08x %08x", |
2922 | ar_nr_responses[0], // UID1 | |
2923 | ar_nr_responses[1], // UID2 | |
2924 | ar_nr_responses[2], // NT1 | |
2925 | ar_nr_responses[3], // AR1 | |
2926 | ar_nr_responses[4], // NR1 | |
2927 | ar_nr_responses[7], // NT2 | |
2928 | ar_nr_responses[8], // AR2 | |
2929 | ar_nr_responses[9] // NR2 | |
2930 | ); | |
7bc95e2e | 2931 | } else { |
d2f487af | 2932 | Dbprintf("Failed to obtain two AR/NR pairs!"); |
12d708fe | 2933 | if(ar_nr_collected > 0 ) { |
2b1f4228 | 2934 | Dbprintf("Only got these: UID=%06x%08x, nonce=%08x, AR1=%08x, NR1=%08x", |
c3c241f3 | 2935 | ar_nr_responses[0], // UID1 |
2936 | ar_nr_responses[1], // UID2 | |
2937 | ar_nr_responses[2], // NT | |
2938 | ar_nr_responses[3], // AR1 | |
2939 | ar_nr_responses[4] // NR1 | |
d2f487af | 2940 | ); |
2941 | } | |
2942 | } | |
2943 | } | |
c3c241f3 | 2944 | if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, BigBuf_get_traceLen()); |
5ee53a0e | 2945 | |
91c7a7cc | 2946 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); |
2947 | LEDsoff(); | |
5ee53a0e | 2948 | set_tracing(FALSE); |
15c4dc5a | 2949 | } |
b62a5a84 | 2950 | |
d2f487af | 2951 | |
b62a5a84 M |
2952 | //----------------------------------------------------------------------------- |
2953 | // MIFARE sniffer. | |
2954 | // | |
2955 | //----------------------------------------------------------------------------- | |
5cd9ec01 M |
2956 | void RAMFUNC SniffMifare(uint8_t param) { |
2957 | // param: | |
2958 | // bit 0 - trigger from first card answer | |
2959 | // bit 1 - trigger from first reader 7-bit request | |
b62a5a84 | 2960 | LEDsoff(); |
810f5379 | 2961 | |
aaa1a9a2 | 2962 | // free eventually allocated BigBuf memory |
2963 | BigBuf_free(); BigBuf_Clear_ext(false); | |
3000dc4e MHS |
2964 | clear_trace(); |
2965 | set_tracing(TRUE); | |
b62a5a84 | 2966 | |
b62a5a84 | 2967 | // The command (reader -> tag) that we're receiving. |
810f5379 | 2968 | uint8_t receivedCmd[MAX_MIFARE_FRAME_SIZE] = {0x00}; |
495d7f13 | 2969 | uint8_t receivedCmdPar[MAX_MIFARE_PARITY_SIZE] = {0x00}; |
810f5379 | 2970 | |
b62a5a84 | 2971 | // The response (tag -> reader) that we're receiving. |
495d7f13 | 2972 | uint8_t receivedResponse[MAX_MIFARE_FRAME_SIZE] = {0x00}; |
2973 | uint8_t receivedResponsePar[MAX_MIFARE_PARITY_SIZE] = {0x00}; | |
b62a5a84 | 2974 | |
99cf19d9 | 2975 | iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER); |
2976 | ||
f71f4deb | 2977 | // allocate the DMA buffer, used to stream samples from the FPGA |
2978 | uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE); | |
7bc95e2e | 2979 | uint8_t *data = dmaBuf; |
2980 | uint8_t previous_data = 0; | |
5cd9ec01 M |
2981 | int maxDataLen = 0; |
2982 | int dataLen = 0; | |
7bc95e2e | 2983 | bool ReaderIsActive = FALSE; |
2984 | bool TagIsActive = FALSE; | |
2985 | ||
b62a5a84 | 2986 | // Set up the demodulator for tag -> reader responses. |
6a1f2d82 | 2987 | DemodInit(receivedResponse, receivedResponsePar); |
b62a5a84 M |
2988 | |
2989 | // Set up the demodulator for the reader -> tag commands | |
6a1f2d82 | 2990 | UartInit(receivedCmd, receivedCmdPar); |
b62a5a84 M |
2991 | |
2992 | // Setup for the DMA. | |
7bc95e2e | 2993 | FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); // set transfer address and number of bytes. Start transfer. |
b62a5a84 | 2994 | |
b62a5a84 | 2995 | LED_D_OFF(); |
39864b0b M |
2996 | |
2997 | // init sniffer | |
2998 | MfSniffInit(); | |
b62a5a84 | 2999 | |
b62a5a84 | 3000 | // And now we loop, receiving samples. |
7bc95e2e | 3001 | for(uint32_t sniffCounter = 0; TRUE; ) { |
91c7a7cc | 3002 | |
3003 | LED_A_ON(); | |
3004 | WDT_HIT(); | |
7bc95e2e | 3005 | |
5cd9ec01 M |
3006 | if(BUTTON_PRESS()) { |
3007 | DbpString("cancelled by button"); | |
7bc95e2e | 3008 | break; |
5cd9ec01 | 3009 | } |
91c7a7cc | 3010 | |
7bc95e2e | 3011 | if ((sniffCounter & 0x0000FFFF) == 0) { // from time to time |
3012 | // check if a transaction is completed (timeout after 2000ms). | |
3013 | // if yes, stop the DMA transfer and send what we have so far to the client | |
3014 | if (MfSniffSend(2000)) { | |
3015 | // Reset everything - we missed some sniffed data anyway while the DMA was stopped | |
3016 | sniffCounter = 0; | |
3017 | data = dmaBuf; | |
3018 | maxDataLen = 0; | |
3019 | ReaderIsActive = FALSE; | |
3020 | TagIsActive = FALSE; | |
3021 | FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); // set transfer address and number of bytes. Start transfer. | |
39864b0b | 3022 | } |
39864b0b | 3023 | } |
7bc95e2e | 3024 | |
3025 | int register readBufDataP = data - dmaBuf; // number of bytes we have processed so far | |
3026 | int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR; // number of bytes already transferred | |
495d7f13 | 3027 | |
3028 | if (readBufDataP <= dmaBufDataP) // we are processing the same block of data which is currently being transferred | |
7bc95e2e | 3029 | dataLen = dmaBufDataP - readBufDataP; // number of bytes still to be processed |
495d7f13 | 3030 | else |
7bc95e2e | 3031 | dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP; // number of bytes still to be processed |
495d7f13 | 3032 | |
5cd9ec01 | 3033 | // test for length of buffer |
7bc95e2e | 3034 | if(dataLen > maxDataLen) { // we are more behind than ever... |
3035 | maxDataLen = dataLen; | |
f71f4deb | 3036 | if(dataLen > (9 * DMA_BUFFER_SIZE / 10)) { |
5cd9ec01 | 3037 | Dbprintf("blew circular buffer! dataLen=0x%x", dataLen); |
7bc95e2e | 3038 | break; |
b62a5a84 M |
3039 | } |
3040 | } | |
5cd9ec01 | 3041 | if(dataLen < 1) continue; |
b62a5a84 | 3042 | |
7bc95e2e | 3043 | // primary buffer was stopped ( <-- we lost data! |
5cd9ec01 M |
3044 | if (!AT91C_BASE_PDC_SSC->PDC_RCR) { |
3045 | AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf; | |
3046 | AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE; | |
91c7a7cc | 3047 | Dbprintf("RxEmpty ERROR, data length:%d", dataLen); // temporary |
5cd9ec01 M |
3048 | } |
3049 | // secondary buffer sets as primary, secondary buffer was stopped | |
3050 | if (!AT91C_BASE_PDC_SSC->PDC_RNCR) { | |
3051 | AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; | |
b62a5a84 M |
3052 | AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE; |
3053 | } | |
5cd9ec01 M |
3054 | |
3055 | LED_A_OFF(); | |
b62a5a84 | 3056 | |
7bc95e2e | 3057 | if (sniffCounter & 0x01) { |
b62a5a84 | 3058 | |
495d7f13 | 3059 | // no need to try decoding tag data if the reader is sending |
3060 | if(!TagIsActive) { | |
7bc95e2e | 3061 | uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4); |
3062 | if(MillerDecoding(readerdata, (sniffCounter-1)*4)) { | |
3063 | LED_C_INV(); | |
495d7f13 | 3064 | |
6a1f2d82 | 3065 | if (MfSniffLogic(receivedCmd, Uart.len, Uart.parity, Uart.bitCount, TRUE)) break; |
b62a5a84 | 3066 | |
f8ada309 | 3067 | UartInit(receivedCmd, receivedCmdPar); |
7bc95e2e | 3068 | DemodReset(); |
3069 | } | |
3070 | ReaderIsActive = (Uart.state != STATE_UNSYNCD); | |
3071 | } | |
3072 | ||
495d7f13 | 3073 | // no need to try decoding tag data if the reader is sending |
3074 | if(!ReaderIsActive) { | |
7bc95e2e | 3075 | uint8_t tagdata = (previous_data << 4) | (*data & 0x0F); |
3076 | if(ManchesterDecoding(tagdata, 0, (sniffCounter-1)*4)) { | |
3077 | LED_C_INV(); | |
b62a5a84 | 3078 | |
6a1f2d82 | 3079 | if (MfSniffLogic(receivedResponse, Demod.len, Demod.parity, Demod.bitCount, FALSE)) break; |
39864b0b | 3080 | |
7bc95e2e | 3081 | DemodReset(); |
0ec548dc | 3082 | UartInit(receivedCmd, receivedCmdPar); |
7bc95e2e | 3083 | } |
3084 | TagIsActive = (Demod.state != DEMOD_UNSYNCD); | |
3085 | } | |
b62a5a84 M |
3086 | } |
3087 | ||
7bc95e2e | 3088 | previous_data = *data; |
3089 | sniffCounter++; | |
5cd9ec01 | 3090 | data++; |
495d7f13 | 3091 | |
3092 | if(data == dmaBuf + DMA_BUFFER_SIZE) | |
5cd9ec01 | 3093 | data = dmaBuf; |
7bc95e2e | 3094 | |
b62a5a84 M |
3095 | } // main cycle |
3096 | ||
55acbb2a | 3097 | FpgaDisableSscDma(); |
39864b0b | 3098 | MfSniffEnd(); |
7838f4be | 3099 | Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.len=%x", maxDataLen, Uart.state, Uart.len); |
91c7a7cc | 3100 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); |
3101 | LEDsoff(); | |
5ee53a0e | 3102 | set_tracing(FALSE); |
3803d529 | 3103 | } |