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Legic: rewrite reader to use xcorrelation and precise timing (#654)
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1//-----------------------------------------------------------------------------
2//
3// This code is licensed to you under the terms of the GNU GPL, version 2 or,
4// at your option, any later version. See the LICENSE.txt file for the text of
5// the license.
6//-----------------------------------------------------------------------------
7// Low frequency fdx-b tag commands
8// Differential Biphase, rf/32, 128 bits (known)
9//-----------------------------------------------------------------------------
10
11#include "cmdlffdx.h"
12
13#include <stdio.h>
14#include <inttypes.h>
15#include <string.h>
16#include "comms.h"
17#include "ui.h" // for PrintAndLog
18#include "util.h"
19#include "cmdparser.h"
20#include "cmddata.h"
21#include "cmdmain.h"
22#include "cmdlf.h"
23#include "crc16.h"
24#include "protocols.h"
25#include "lfdemod.h"
26
27/*
28 FDX-B ISO11784/85 demod (aka animal tag) BIPHASE, inverted, rf/32, with preamble of 00000000001 (128bits)
29 8 databits + 1 parity (1)
30 CIITT 16 checksum
31 NATIONAL CODE, ICAR database
32 COUNTRY CODE (ISO3166) or http://cms.abvma.ca/uploads/ManufacturersISOsandCountryCodes.pdf
33 FLAG (animal/non-animal)
34
35 38 IDbits
36 10 country code
37 1 extra app bit
38 14 reserved bits
39 1 animal bit
40 16 ccitt CRC chksum over 64bit ID CODE.
41 24 appli bits.
42
43 sample: 985121004515220 [ 37FF65B88EF94 ]
44*/
45
46static int CmdHelp(const char *Cmd);
47
48int usage_lf_fdx_clone(void){
49 PrintAndLog("Clone a FDX-B animal tag to a T55x7 tag.");
50 PrintAndLog("Usage: lf fdx clone [h] <country id> <animal id> <Q5>");
51 PrintAndLog("Options:");
52 PrintAndLog(" h : This help");
53 PrintAndLog(" <country id> : Country id");
54 PrintAndLog(" <animal id> : Animal id");
55 // has extended data?
56 //reserved/rfu
57 //is animal tag
58 // extended data
59 PrintAndLog(" <Q5> : Specify write to Q5 (t5555 instead of t55x7)");
60 PrintAndLog("");
61 PrintAndLog("Sample: lf fdx clone 999 112233");
62 return 0;
63}
64
65int usage_lf_fdx_sim(void) {
66 PrintAndLog("Enables simulation of FDX-B animal tag");
67 PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
68 PrintAndLog("");
69 PrintAndLog("Usage: lf fdx sim [h] <country id> <animal id>");
70 PrintAndLog("Options:");
71 PrintAndLog(" h : This help");
72 PrintAndLog(" <country id> : Country ID");
73 PrintAndLog(" <animal id> : Animal ID");
74 PrintAndLog("");
75 PrintAndLog("Sample: lf fdx sim 999 112233");
76 return 0;
77}
78// clearing the topbit needed for the preambl detection.
79static void verify_values(uint32_t countryid, uint64_t animalid){
80 if ((animalid & 0x3FFFFFFFFF) != animalid) {
81 animalid &= 0x3FFFFFFFFF;
82 PrintAndLog("Animal ID Truncated to 38bits: %"PRIx64, animalid);
83 }
84 if ( (countryid & 0x3ff) != countryid ) {
85 countryid &= 0x3ff;
86 PrintAndLog("Country ID Truncated to 10bits: %03d", countryid);
87 }
88}
89
90int getFDXBits(uint64_t national_id, uint16_t country, uint8_t isanimal, uint8_t isextended, uint32_t extended, uint8_t *bits) {
91
92 // 128bits
93 // every 9th bit is 0x01, but we can just fill the rest with 0x01 and overwrite
94 memset(bits, 0x01, 128);
95
96 // add preamble ten 0x00 and one 0x01
97 memset(bits, 0x00, 10);
98
99 // add reserved
100 num_to_bytebitsLSBF(0x00, 7, bits + 66);
101 num_to_bytebitsLSBF(0x00 >> 7, 7, bits + 74);
102
103 // add animal flag - OK
104 bits[65] = isanimal;
105
106 // add extended flag - OK
107 bits[81] = isextended;
108
109 // add national code 40bits - OK
110 num_to_bytebitsLSBF(national_id >> 0, 8, bits+11);
111 num_to_bytebitsLSBF(national_id >> 8, 8, bits+20);
112 num_to_bytebitsLSBF(national_id >> 16, 8, bits+29);
113 num_to_bytebitsLSBF(national_id >> 24, 8, bits+38);
114 num_to_bytebitsLSBF(national_id >> 32, 6, bits+47);
115
116 // add country code - OK
117 num_to_bytebitsLSBF(country >> 0, 2, bits+53);
118 num_to_bytebitsLSBF(country >> 2, 8, bits+56);
119
120 // add crc-16 - OK
121 uint8_t raw[8];
122 for (uint8_t i=0; i<8; ++i)
123 raw[i] = bytebits_to_byte(bits + 11 + i * 9, 8);
124
125 uint16_t crc = crc16_ccitt_kermit(raw, 8);
126 num_to_bytebitsLSBF(crc >> 0, 8, bits+83);
127 num_to_bytebitsLSBF(crc >> 8, 8, bits+92);
128
129 // extended data - OK
130 num_to_bytebitsLSBF( extended >> 0 , 8, bits+101);
131 num_to_bytebitsLSBF( extended >> 8 , 8, bits+110);
132 num_to_bytebitsLSBF( extended >> 16, 8, bits+119);
133 return 1;
134}
135
136int CmdFdxDemod(const char *Cmd){
137
138 //Differential Biphase / di-phase (inverted biphase)
139 //get binary from ask wave
140 if (!ASKbiphaseDemod("0 32 1 0", false)) {
141 if (g_debugMode) PrintAndLog("DEBUG: Error - FDX-B ASKbiphaseDemod failed");
142 return 0;
143 }
144 size_t size = DemodBufferLen;
145 int preambleIndex = FDXBdemodBI(DemodBuffer, &size);
146 if (preambleIndex < 0){
147 if (g_debugMode){
148 if (preambleIndex == -1)
149 PrintAndLog("DEBUG: Error - FDX-B too few bits found");
150 else if (preambleIndex == -2)
151 PrintAndLog("DEBUG: Error - FDX-B preamble not found");
152 else if (preambleIndex == -3)
153 PrintAndLog("DEBUG: Error - FDX-B Size not correct: %d", size);
154 else
155 PrintAndLog("DEBUG: Error - FDX-B ans: %d", preambleIndex);
156 }
157 return 0;
158 }
159
160 // set and leave DemodBuffer intact
161 setDemodBuf(DemodBuffer, 128, preambleIndex);
162 setClockGrid(g_DemodClock, g_DemodStartIdx + (preambleIndex*g_DemodClock));
163
164 uint8_t bits_no_spacer[117];
165 memcpy(bits_no_spacer, DemodBuffer + 11, 117);
166
167 // remove marker bits (1's every 9th digit after preamble) (pType = 2)
168 size = removeParity(bits_no_spacer, 0, 9, 2, 117);
169 if ( size != 104 ) {
170 if (g_debugMode) PrintAndLog("DEBUG: Error removeParity:: %d", size);
171 return 0;
172 }
173
174 //got a good demod
175 uint64_t NationalCode = ((uint64_t)(bytebits_to_byteLSBF(bits_no_spacer+32,6)) << 32) | bytebits_to_byteLSBF(bits_no_spacer,32);
176 uint32_t countryCode = bytebits_to_byteLSBF(bits_no_spacer+38,10);
177 uint8_t dataBlockBit = bits_no_spacer[48];
178 uint32_t reservedCode = bytebits_to_byteLSBF(bits_no_spacer+49,14);
179 uint8_t animalBit = bits_no_spacer[63];
180 uint32_t crc16 = bytebits_to_byteLSBF(bits_no_spacer+64,16);
181 uint32_t extended = bytebits_to_byteLSBF(bits_no_spacer+80,24);
182
183 uint64_t rawid = ((uint64_t)bytebits_to_byte(bits_no_spacer,32)<<32) | bytebits_to_byte(bits_no_spacer+32,32);
184 uint8_t raw[8];
185 num_to_bytes(rawid, 8, raw);
186
187 if (g_debugMode) {
188 PrintAndLog("DEBUG: bits_no_spacer:\n%s",sprint_bin_break(bits_no_spacer,size,16));
189 PrintAndLog("DEBUG: Start marker %d; Size %d", preambleIndex, size);
190 PrintAndLog("DEBUG: Raw ID Hex: %s", sprint_hex(raw,8));
191 }
192
193 uint16_t calcCrc = crc16_ccitt_kermit(raw, 8);
194 PrintAndLog("\nFDX-B / ISO 11784/5 Animal Tag ID Found:");
195 PrintAndLog("Animal ID: %04u-%012" PRIu64, countryCode, NationalCode);
196 PrintAndLog("National Code: %012" PRIu64, NationalCode);
197 PrintAndLog("CountryCode: %04u", countryCode);
198 PrintAndLog("Reserved Code: %u", reservedCode);
199 PrintAndLog("Animal Tag: %s", animalBit ? "True" : "False");
200 PrintAndLog("Has Extended: %s [0x%X]", dataBlockBit ? "True" : "False", extended);
201 PrintAndLog("CRC: 0x%04X - 0x%04X - [%s]\n", crc16, calcCrc, (calcCrc == crc16) ? "Passed" : "Failed");
202
203 // set block 0 for later
204 //g_DemodConfig = T55x7_MODULATION_DIPHASE | T55x7_BITRATE_RF_32 | 4 << T55x7_MAXBLOCK_SHIFT;
205 return 1;
206}
207
208int CmdFdxRead(const char *Cmd) {
209 lf_read(true, 10000);
210 return CmdFdxDemod(Cmd);
211}
212
213int CmdFdxClone(const char *Cmd) {
214
215 uint32_t countryid = 0;
216 uint64_t animalid = 0;
217 uint32_t blocks[5] = {T55x7_MODULATION_DIPHASE | T55x7_BITRATE_RF_32 | 4 << T55x7_MAXBLOCK_SHIFT, 0, 0, 0, 0};
218 uint8_t bits[128];
219 uint8_t *bs = bits;
220 memset(bs, 0, sizeof(bits));
221
222 char cmdp = param_getchar(Cmd, 0);
223 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_fdx_clone();
224
225 countryid = param_get32ex(Cmd, 0, 0, 10);
226 animalid = param_get64ex(Cmd, 1, 0, 10);
227
228 //Q5
229 if (param_getchar(Cmd, 2) == 'Q' || param_getchar(Cmd, 2) == 'q') {
230 //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
231 blocks[0] = T5555_MODULATION_BIPHASE | T5555_INVERT_OUTPUT | ((32-2)>>1) << T5555_BITRATE_SHIFT | 4 << T5555_MAXBLOCK_SHIFT;
232 }
233
234 verify_values(countryid, animalid);
235
236 // getFDXBits(uint64_t national_id, uint16_t country, uint8_t isanimal, uint8_t isextended, uint32_t extended, uint8_t *bits)
237 if ( !getFDXBits(animalid, countryid, 1, 0, 0, bs)) {
238 PrintAndLog("Error with tag bitstream generation.");
239 return 1;
240 }
241
242 // convert from bit stream to block data
243 blocks[1] = bytebits_to_byte(bs,32);
244 blocks[2] = bytebits_to_byte(bs+32,32);
245 blocks[3] = bytebits_to_byte(bs+64,32);
246 blocks[4] = bytebits_to_byte(bs+96,32);
247
248 PrintAndLog("Preparing to clone FDX-B to T55x7 with animal ID: %04u-%"PRIu64, countryid, animalid);
249 PrintAndLog("Blk | Data ");
250 PrintAndLog("----+------------");
251 PrintAndLog(" 00 | 0x%08x", blocks[0]);
252 PrintAndLog(" 01 | 0x%08x", blocks[1]);
253 PrintAndLog(" 02 | 0x%08x", blocks[2]);
254 PrintAndLog(" 03 | 0x%08x", blocks[3]);
255 PrintAndLog(" 04 | 0x%08x", blocks[4]);
256
257 UsbCommand resp;
258 UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
259
260 for (int i = 4; i >= 0; --i) {
261 c.arg[0] = blocks[i];
262 c.arg[1] = i;
263 clearCommandBuffer();
264 SendCommand(&c);
265 if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)){
266 PrintAndLog("Error occurred, device did not respond during write operation.");
267 return -1;
268 }
269 }
270 return 0;
271}
272
273int CmdFdxSim(const char *Cmd) {
274 uint32_t countryid = 0;
275 uint64_t animalid = 0;
276
277 char cmdp = param_getchar(Cmd, 0);
278 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_fdx_sim();
279
280 countryid = param_get32ex(Cmd, 0, 0, 10);
281 animalid = param_get64ex(Cmd, 1, 0, 10);
282
283 verify_values(countryid, animalid);
284
285 uint8_t clk = 32, encoding = 2, separator = 0, invert = 1;
286 uint16_t arg1, arg2;
287 size_t size = 128;
288 arg1 = clk << 8 | encoding;
289 arg2 = invert << 8 | separator;
290
291 PrintAndLog("Simulating FDX-B animal ID: %04u-%"PRIu64, countryid, animalid);
292
293 UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
294
295 //getFDXBits(uint64_t national_id, uint16_t country, uint8_t isanimal, uint8_t isextended, uint32_t extended, uint8_t *bits)
296 getFDXBits(animalid, countryid, 1, 0, 0, c.d.asBytes);
297 clearCommandBuffer();
298 SendCommand(&c);
299 return 0;
300}
301
302static command_t CommandTable[] = {
303 {"help", CmdHelp, 1, "This help"},
304 {"demod", CmdFdxDemod,1, "Attempt to extract FDX-B ISO11784/85 data from the GraphBuffer"},
305 {"read", CmdFdxRead, 0, "Attempt to read and extract FDX-B ISO11784/85 data"},
306 {"clone", CmdFdxClone,0, "Clone animal ID tag to T55x7 (or to q5/T5555)"},
307 {"sim", CmdFdxSim, 0, "Animal ID tag simulator"},
308 {NULL, NULL, 0, NULL}
309};
310
311int CmdLFFdx(const char *Cmd) {
312 clearCommandBuffer();
313 CmdsParse(CommandTable, Cmd);
314 return 0;
315}
316
317int CmdHelp(const char *Cmd) {
318 CmdsHelp(CommandTable);
319 return 0;
320}
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