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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 }
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