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1 | //----------------------------------------------------------------------------- | |
2 | // Copyright (C) 2010 iZsh <izsh at fail0verflow.com> | |
3 | // | |
4 | // This code is licensed to you under the terms of the GNU GPL, version 2 or, | |
5 | // at your option, any later version. See the LICENSE.txt file for the text of | |
6 | // the license. | |
7 | //----------------------------------------------------------------------------- | |
8 | // High frequency ISO14443B commands | |
9 | //----------------------------------------------------------------------------- | |
10 | ||
11 | #include <stdio.h> | |
12 | #include <stdlib.h> | |
13 | #include <stdbool.h> | |
14 | #include <string.h> | |
15 | #include <stdint.h> | |
16 | #include "iso14443crc.h" | |
17 | //#include "proxusb.h" | |
18 | #include "proxmark3.h" | |
19 | #include "data.h" | |
20 | #include "graph.h" | |
21 | #include "ui.h" | |
22 | #include "cmdparser.h" | |
23 | #include "cmdhf14b.h" | |
24 | #include "cmdmain.h" | |
25 | ||
26 | static int CmdHelp(const char *Cmd); | |
27 | ||
28 | int CmdHF14BDemod(const char *Cmd) | |
29 | { | |
30 | int i, j, iold; | |
31 | int isum, qsum; | |
32 | int outOfWeakAt; | |
33 | bool negateI, negateQ; | |
34 | ||
35 | uint8_t data[256]; | |
36 | int dataLen = 0; | |
37 | ||
38 | // As received, the samples are pairs, correlations against I and Q | |
39 | // square waves. So estimate angle of initial carrier (or just | |
40 | // quadrant, actually), and then do the demod. | |
41 | ||
42 | // First, estimate where the tag starts modulating. | |
43 | for (i = 0; i < GraphTraceLen; i += 2) { | |
44 | if (abs(GraphBuffer[i]) + abs(GraphBuffer[i + 1]) > 40) { | |
45 | break; | |
46 | } | |
47 | } | |
48 | if (i >= GraphTraceLen) { | |
49 | PrintAndLog("too weak to sync"); | |
50 | return 0; | |
51 | } | |
52 | PrintAndLog("out of weak at %d", i); | |
53 | outOfWeakAt = i; | |
54 | ||
55 | // Now, estimate the phase in the initial modulation of the tag | |
56 | isum = 0; | |
57 | qsum = 0; | |
58 | for (; i < (outOfWeakAt + 16); i += 2) { | |
59 | isum += GraphBuffer[i + 0]; | |
60 | qsum += GraphBuffer[i + 1]; | |
61 | } | |
62 | negateI = (isum < 0); | |
63 | negateQ = (qsum < 0); | |
64 | ||
65 | // Turn the correlation pairs into soft decisions on the bit. | |
66 | j = 0; | |
67 | for (i = 0; i < GraphTraceLen / 2; i++) { | |
68 | int si = GraphBuffer[j]; | |
69 | int sq = GraphBuffer[j + 1]; | |
70 | if (negateI) si = -si; | |
71 | if (negateQ) sq = -sq; | |
72 | GraphBuffer[i] = si + sq; | |
73 | j += 2; | |
74 | } | |
75 | GraphTraceLen = i; | |
76 | ||
77 | i = outOfWeakAt / 2; | |
78 | while (GraphBuffer[i] > 0 && i < GraphTraceLen) | |
79 | i++; | |
80 | if (i >= GraphTraceLen) goto demodError; | |
81 | ||
82 | iold = i; | |
83 | while (GraphBuffer[i] < 0 && i < GraphTraceLen) | |
84 | i++; | |
85 | if (i >= GraphTraceLen) goto demodError; | |
86 | if ((i - iold) > 23) goto demodError; | |
87 | ||
88 | PrintAndLog("make it to demod loop"); | |
89 | ||
90 | for (;;) { | |
91 | iold = i; | |
92 | while (GraphBuffer[i] >= 0 && i < GraphTraceLen) | |
93 | i++; | |
94 | if (i >= GraphTraceLen) goto demodError; | |
95 | if ((i - iold) > 6) goto demodError; | |
96 | ||
97 | uint16_t shiftReg = 0; | |
98 | if (i + 20 >= GraphTraceLen) goto demodError; | |
99 | ||
100 | for (j = 0; j < 10; j++) { | |
101 | int soft = GraphBuffer[i] + GraphBuffer[i + 1]; | |
102 | ||
103 | if (abs(soft) < (abs(isum) + abs(qsum)) / 20) { | |
104 | PrintAndLog("weak bit"); | |
105 | } | |
106 | ||
107 | shiftReg >>= 1; | |
108 | if(GraphBuffer[i] + GraphBuffer[i+1] >= 0) { | |
109 | shiftReg |= 0x200; | |
110 | } | |
111 | ||
112 | i+= 2; | |
113 | } | |
114 | ||
115 | if ((shiftReg & 0x200) && !(shiftReg & 0x001)) | |
116 | { | |
117 | // valid data byte, start and stop bits okay | |
118 | PrintAndLog(" %02x", (shiftReg >> 1) & 0xff); | |
119 | data[dataLen++] = (shiftReg >> 1) & 0xff; | |
120 | if (dataLen >= sizeof(data)) { | |
121 | return 0; | |
122 | } | |
123 | } else if (shiftReg == 0x000) { | |
124 | // this is EOF | |
125 | break; | |
126 | } else { | |
127 | goto demodError; | |
128 | } | |
129 | } | |
130 | ||
131 | uint8_t first, second; | |
132 | ComputeCrc14443(CRC_14443_B, data, dataLen-2, &first, &second); | |
133 | PrintAndLog("CRC: %02x %02x (%s)\n", first, second, | |
134 | (first == data[dataLen-2] && second == data[dataLen-1]) ? | |
135 | "ok" : "****FAIL****"); | |
136 | ||
137 | RepaintGraphWindow(); | |
138 | return 0; | |
139 | ||
140 | demodError: | |
141 | PrintAndLog("demod error"); | |
142 | RepaintGraphWindow(); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | int CmdHF14BList(const char *Cmd) | |
147 | { | |
148 | uint8_t got[960]; | |
149 | GetFromBigBuf(got,sizeof(got),0); | |
150 | ||
151 | PrintAndLog("recorded activity:"); | |
152 | PrintAndLog(" time :rssi: who bytes"); | |
153 | PrintAndLog("---------+----+----+-----------"); | |
154 | ||
155 | int i = 0; | |
156 | int prev = -1; | |
157 | ||
158 | for(;;) { | |
159 | if(i >= 900) { | |
160 | break; | |
161 | } | |
162 | ||
163 | bool isResponse; | |
164 | int timestamp = *((uint32_t *)(got+i)); | |
165 | if(timestamp & 0x80000000) { | |
166 | timestamp &= 0x7fffffff; | |
167 | isResponse = 1; | |
168 | } else { | |
169 | isResponse = 0; | |
170 | } | |
171 | int metric = *((uint32_t *)(got+i+4)); | |
172 | ||
173 | int len = got[i+8]; | |
174 | ||
175 | if(len > 100) { | |
176 | break; | |
177 | } | |
178 | if(i + len >= 900) { | |
179 | break; | |
180 | } | |
181 | ||
182 | uint8_t *frame = (got+i+9); | |
183 | ||
184 | char line[1000] = ""; | |
185 | int j; | |
186 | for(j = 0; j < len; j++) { | |
187 | sprintf(line+(j*3), "%02x ", frame[j]); | |
188 | } | |
189 | ||
190 | char *crc; | |
191 | if(len > 2) { | |
192 | uint8_t b1, b2; | |
193 | ComputeCrc14443(CRC_14443_B, frame, len-2, &b1, &b2); | |
194 | if(b1 != frame[len-2] || b2 != frame[len-1]) { | |
195 | crc = "**FAIL CRC**"; | |
196 | } else { | |
197 | crc = ""; | |
198 | } | |
199 | } else { | |
200 | crc = "(SHORT)"; | |
201 | } | |
202 | ||
203 | char metricString[100]; | |
204 | if(isResponse) { | |
205 | sprintf(metricString, "%3d", metric); | |
206 | } else { | |
207 | strcpy(metricString, " "); | |
208 | } | |
209 | ||
210 | PrintAndLog(" +%7d: %s: %s %s %s", | |
211 | (prev < 0 ? 0 : timestamp - prev), | |
212 | metricString, | |
213 | (isResponse ? "TAG" : " "), line, crc); | |
214 | ||
215 | prev = timestamp; | |
216 | i += (len + 9); | |
217 | } | |
218 | return 0; | |
219 | } | |
220 | ||
221 | int CmdHF14BRead(const char *Cmd) | |
222 | { | |
223 | UsbCommand c = {CMD_ACQUIRE_RAW_ADC_SAMPLES_ISO_14443, {strtol(Cmd, NULL, 0), 0, 0}}; | |
224 | SendCommand(&c); | |
225 | return 0; | |
226 | } | |
227 | ||
228 | int CmdHF14Sim(const char *Cmd) | |
229 | { | |
230 | UsbCommand c={CMD_SIMULATE_TAG_ISO_14443}; | |
231 | SendCommand(&c); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | int CmdHFSimlisten(const char *Cmd) | |
236 | { | |
237 | UsbCommand c = {CMD_SIMULATE_TAG_HF_LISTEN}; | |
238 | SendCommand(&c); | |
239 | return 0; | |
240 | } | |
241 | ||
242 | int CmdHF14BSnoop(const char *Cmd) | |
243 | { | |
244 | UsbCommand c = {CMD_SNOOP_ISO_14443}; | |
245 | SendCommand(&c); | |
246 | return 0; | |
247 | } | |
248 | ||
249 | /* New command to read the contents of a SRI512 tag | |
250 | * SRI512 tags are ISO14443-B modulated memory tags, | |
251 | * this command just dumps the contents of the memory | |
252 | */ | |
253 | int CmdSri512Read(const char *Cmd) | |
254 | { | |
255 | UsbCommand c = {CMD_READ_SRI512_TAG, {strtol(Cmd, NULL, 0), 0, 0}}; | |
256 | SendCommand(&c); | |
257 | return 0; | |
258 | } | |
259 | ||
260 | /* New command to read the contents of a SRIX4K tag | |
261 | * SRIX4K tags are ISO14443-B modulated memory tags, | |
262 | * this command just dumps the contents of the memory/ | |
263 | */ | |
264 | int CmdSrix4kRead(const char *Cmd) | |
265 | { | |
266 | UsbCommand c = {CMD_READ_SRIX4K_TAG, {strtol(Cmd, NULL, 0), 0, 0}}; | |
267 | SendCommand(&c); | |
268 | return 0; | |
269 | } | |
270 | ||
271 | int CmdHF14BCmdRaw (const char *cmd) { | |
272 | UsbCommand resp; | |
273 | uint8_t *recv; | |
274 | UsbCommand c = {CMD_ISO_14443B_COMMAND, {0, 0, 0}}; // len,recv? | |
275 | uint8_t reply=1; | |
276 | uint8_t crc=0; | |
277 | uint8_t power=0; | |
278 | char buf[5]=""; | |
279 | int i=0; | |
280 | uint8_t data[100]; | |
281 | unsigned int datalen=0, temp; | |
282 | char *hexout; | |
283 | ||
284 | if (strlen(cmd)<3) { | |
285 | PrintAndLog("Usage: hf 14b raw [-r] [-c] [-p] <0A 0B 0C ... hex>"); | |
286 | PrintAndLog(" -r do not read response"); | |
287 | PrintAndLog(" -c calculate and append CRC"); | |
288 | PrintAndLog(" -p leave the field on after receive"); | |
289 | return 0; | |
290 | } | |
291 | ||
292 | // strip | |
293 | while (*cmd==' ' || *cmd=='\t') cmd++; | |
294 | ||
295 | while (cmd[i]!='\0') { | |
296 | if (cmd[i]==' ' || cmd[i]=='\t') { i++; continue; } | |
297 | if (cmd[i]=='-') { | |
298 | switch (cmd[i+1]) { | |
299 | case 'r': | |
300 | case 'R': | |
301 | reply=0; | |
302 | break; | |
303 | case 'c': | |
304 | case 'C': | |
305 | crc=1; | |
306 | break; | |
307 | case 'p': | |
308 | case 'P': | |
309 | power=1; | |
310 | break; | |
311 | default: | |
312 | PrintAndLog("Invalid option"); | |
313 | return 0; | |
314 | } | |
315 | i+=2; | |
316 | continue; | |
317 | } | |
318 | if ((cmd[i]>='0' && cmd[i]<='9') || | |
319 | (cmd[i]>='a' && cmd[i]<='f') || | |
320 | (cmd[i]>='A' && cmd[i]<='F') ) { | |
321 | buf[strlen(buf)+1]=0; | |
322 | buf[strlen(buf)]=cmd[i]; | |
323 | i++; | |
324 | ||
325 | if (strlen(buf)>=2) { | |
326 | sscanf(buf,"%x",&temp); | |
327 | data[datalen]=(uint8_t)(temp & 0xff); | |
328 | datalen++; | |
329 | *buf=0; | |
330 | } | |
331 | continue; | |
332 | } | |
333 | PrintAndLog("Invalid char on input"); | |
334 | return 0; | |
335 | } | |
336 | if(crc) | |
337 | { | |
338 | uint8_t first, second; | |
339 | ComputeCrc14443(CRC_14443_B, data, datalen, &first, &second); | |
340 | data[datalen++] = first; | |
341 | data[datalen++] = second; | |
342 | } | |
343 | ||
344 | c.arg[0] = datalen; | |
345 | c.arg[1] = reply; | |
346 | c.arg[2] = power; | |
347 | memcpy(c.d.asBytes,data,datalen); | |
348 | ||
349 | SendCommand(&c); | |
350 | ||
351 | if (reply) { | |
352 | if (WaitForResponseTimeout(CMD_ACK,&resp,1000)) { | |
353 | recv = resp.d.asBytes; | |
354 | PrintAndLog("received %i octets",resp.arg[0]); | |
355 | if(!resp.arg[0]) | |
356 | return 0; | |
357 | hexout = (char *)malloc(resp.arg[0] * 3 + 1); | |
358 | if (hexout != NULL) { | |
359 | uint8_t first, second; | |
360 | for (int i = 0; i < resp.arg[0]; i++) { // data in hex | |
361 | sprintf(&hexout[i * 3], "%02hX ", recv[i]); | |
362 | } | |
363 | PrintAndLog("%s", hexout); | |
364 | free(hexout); | |
365 | ComputeCrc14443(CRC_14443_B, recv, resp.arg[0]-2, &first, &second); | |
366 | if(recv[resp.arg[0]-2]==first && recv[resp.arg[0]-1]==second) { | |
367 | PrintAndLog("CRC OK"); | |
368 | } else { | |
369 | PrintAndLog("CRC failed"); | |
370 | } | |
371 | } else { | |
372 | PrintAndLog("malloc failed your client has low memory?"); | |
373 | } | |
374 | } else { | |
375 | PrintAndLog("timeout while waiting for reply."); | |
376 | } | |
377 | } // if reply | |
378 | return 0; | |
379 | } | |
380 | ||
381 | static command_t CommandTable[] = | |
382 | { | |
383 | {"help", CmdHelp, 1, "This help"}, | |
384 | {"demod", CmdHF14BDemod, 1, "Demodulate ISO14443 Type B from tag"}, | |
385 | {"list", CmdHF14BList, 0, "List ISO 14443 history"}, | |
386 | {"read", CmdHF14BRead, 0, "Read HF tag (ISO 14443)"}, | |
387 | {"sim", CmdHF14Sim, 0, "Fake ISO 14443 tag"}, | |
388 | {"simlisten", CmdHFSimlisten, 0, "Get HF samples as fake tag"}, | |
389 | {"snoop", CmdHF14BSnoop, 0, "Eavesdrop ISO 14443"}, | |
390 | {"sri512read", CmdSri512Read, 0, "Read contents of a SRI512 tag"}, | |
391 | {"srix4kread", CmdSrix4kRead, 0, "Read contents of a SRIX4K tag"}, | |
392 | {"raw", CmdHF14BCmdRaw, 0, "Send raw hex data to tag"}, | |
393 | {NULL, NULL, 0, NULL} | |
394 | }; | |
395 | ||
396 | int CmdHF14B(const char *Cmd) | |
397 | { | |
398 | CmdsParse(CommandTable, Cmd); | |
399 | return 0; | |
400 | } | |
401 | ||
402 | int CmdHelp(const char *Cmd) | |
403 | { | |
404 | CmdsHelp(CommandTable); | |
405 | return 0; | |
406 | } |