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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 jablotron tag commands
8 // Differential Biphase, RF/64, 64 bits long (complete)
9 //-----------------------------------------------------------------------------
10
11 #include "cmdlfjablotron.h"
12
13 #include <string.h>
14 #include <inttypes.h>
15 #include <stdbool.h>
16 #include "comms.h"
17 #include "ui.h"
18 #include "util.h"
19 #include "graph.h"
20 #include "cmdparser.h"
21 #include "cmddata.h"
22 #include "cmdmain.h"
23 #include "cmdlf.h"
24 #include "protocols.h" // for T55xx config register definitions
25 #include "lfdemod.h" // parityTest
26
27 static int CmdHelp(const char *Cmd);
28
29 int usage_lf_jablotron_clone(void) {
30 PrintAndLog("clone a Jablotron tag to a T55x7 tag.");
31 PrintAndLog("Usage: lf jablotron clone [h] <card ID> <Q5>");
32 PrintAndLog("Options:");
33 PrintAndLog(" h : This help");
34 PrintAndLog(" <card ID> : jablotron card ID");
35 PrintAndLog(" <Q5> : specify write to Q5 (t5555 instead of t55x7)");
36 PrintAndLog("");
37 PrintAndLog("Sample: lf jablotron clone 112233");
38 return 0;
39 }
40
41 int usage_lf_jablotron_sim(void) {
42 PrintAndLog("Enables simulation of jablotron card with specified card number.");
43 PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
44 PrintAndLog("");
45 PrintAndLog("Usage: lf jablotron sim [h] <card ID>");
46 PrintAndLog("Options:");
47 PrintAndLog(" h : This help");
48 PrintAndLog(" <card ID> : jablotron card ID");
49 PrintAndLog("");
50 PrintAndLog("Sample: lf jablotron sim 112233");
51 return 0;
52 }
53
54 static uint8_t jablontron_chksum(uint8_t *bits) {
55 uint8_t chksum = 0;
56 for (int i=16; i < 56; i += 8) {
57 chksum += bytebits_to_byte(bits+i,8);
58 }
59 chksum ^= 0x3A;
60 return chksum;
61 }
62
63 int getJablotronBits(uint64_t fullcode, uint8_t *bits) {
64 //preamp
65 num_to_bytebits(0xFFFF, 16, bits);
66
67 //fullcode
68 num_to_bytebits(fullcode, 40, bits+16);
69
70 //chksum byte
71 uint8_t chksum = jablontron_chksum(bits);
72 num_to_bytebits(chksum, 8, bits+56);
73 return 1;
74 }
75
76 // ASK/Diphase fc/64 (inverted Biphase)
77 // Note: this is not a demod, this is only a detection
78 // the parameter *bits needs to be demoded before call
79 // 0xFFFF preamble, 64bits
80 int JablotronDetect(uint8_t *bits, size_t *size) {
81 if (*size < 64*2) return -1; //make sure buffer has enough data
82 size_t startIdx = 0;
83 uint8_t preamble[] = {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0};
84 if (preambleSearch(bits, preamble, sizeof(preamble), size, &startIdx) == 0)
85 return -2; //preamble not found
86 if (*size != 64) return -3; // wrong demoded size
87
88 uint8_t checkchksum = jablontron_chksum(bits+startIdx);
89 uint8_t crc = bytebits_to_byte(bits+startIdx+56, 8);
90 if ( checkchksum != crc ) return -5;
91 return (int)startIdx;
92 }
93
94 //see ASKDemod for what args are accepted
95 int CmdJablotronDemod(const char *Cmd) {
96
97 //Differential Biphase / di-phase (inverted biphase)
98 //get binary from ask wave
99 if (!ASKbiphaseDemod("0 64 1 0", false)) {
100 if (g_debugMode) PrintAndLog("DEBUG: Error - Jablotron ASKbiphaseDemod failed");
101 return 0;
102 }
103 size_t size = DemodBufferLen;
104 int ans = JablotronDetect(DemodBuffer, &size);
105 if (ans < 0) {
106 if (g_debugMode) {
107 if (ans == -1)
108 PrintAndLog("DEBUG: Error - Jablotron too few bits found");
109 else if (ans == -2)
110 PrintAndLog("DEBUG: Error - Jablotron preamble not found");
111 else if (ans == -3)
112 PrintAndLog("DEBUG: Error - Jablotron size not correct: %d", size);
113 else if (ans == -5)
114 PrintAndLog("DEBUG: Error - Jablotron checksum failed");
115 else
116 PrintAndLog("DEBUG: Error - Jablotron ans: %d", ans);
117 }
118 return 0;
119 }
120
121 setDemodBuf(DemodBuffer, 64, ans);
122 setClockGrid(g_DemodClock, g_DemodStartIdx + (ans*g_DemodClock));
123
124 //got a good demod
125 uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
126 uint32_t raw2 = bytebits_to_byte(DemodBuffer+32, 32);
127
128 uint64_t id = (( (uint64_t)bytebits_to_byte(DemodBuffer+16, 8) )<< 32) | bytebits_to_byte(DemodBuffer+24,32);
129
130 PrintAndLog("Jablotron Tag Found: Card ID: %"PRIx64" :: Raw: %08X%08X", id, raw1, raw2);
131
132 uint8_t chksum = raw2 & 0xFF;
133 PrintAndLog("Checksum: %02X [OK]", chksum);
134
135 // Printed format: 1410-nn-nnnn-nnnn
136 PrintAndLog("Printed: 1410-%02X-%04X-%04X",
137 (uint8_t)(id >> 32) & 0xFF,
138 (uint16_t)(id >> 16) & 0xFFFF,
139 (uint16_t)id & 0xFFFF
140 );
141 return 1;
142 }
143
144 int CmdJablotronRead(const char *Cmd) {
145 lf_read(true, 10000);
146 return CmdJablotronDemod(Cmd);
147 }
148
149 int CmdJablotronClone(const char *Cmd) {
150
151 uint64_t fullcode = 0;
152 uint32_t blocks[3] = {T55x7_MODULATION_DIPHASE | T55x7_BITRATE_RF_64 | 2 << T55x7_MAXBLOCK_SHIFT, 0, 0};
153
154 uint8_t bits[64];
155 uint8_t *bs = bits;
156 memset(bs, 0, sizeof(bits));
157
158 char cmdp = param_getchar(Cmd, 0);
159 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_jablotron_clone();
160
161 fullcode = param_get64ex(Cmd, 0, 0, 16);
162
163 //Q5
164 if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q') {
165 //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
166 blocks[0] = T5555_MODULATION_BIPHASE | T5555_INVERT_OUTPUT | ((64-2)>>1) << T5555_BITRATE_SHIFT | 2 << T5555_MAXBLOCK_SHIFT;
167 }
168
169 // clearing the topbit needed for the preambl detection.
170 if ((fullcode & 0x7FFFFFFFFF) != fullcode) {
171 fullcode &= 0x7FFFFFFFFF;
172 PrintAndLog("Card Number Truncated to 39bits: %"PRIx64, fullcode);
173 }
174
175 if ( !getJablotronBits(fullcode, bs)) {
176 PrintAndLog("Error with tag bitstream generation.");
177 return 1;
178 }
179
180 blocks[1] = bytebits_to_byte(bs,32);
181 blocks[2] = bytebits_to_byte(bs+32,32);
182
183 PrintAndLog("Preparing to clone Jablotron to T55x7 with FullCode: %"PRIx64, fullcode);
184 PrintAndLog("Blk | Data ");
185 PrintAndLog("----+------------");
186 PrintAndLog(" 00 | 0x%08x", blocks[0]);
187 PrintAndLog(" 01 | 0x%08x", blocks[1]);
188 PrintAndLog(" 02 | 0x%08x", blocks[2]);
189
190 UsbCommand resp;
191 UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
192
193 for (int i = 2; i >= 0; --i) {
194 c.arg[0] = blocks[i];
195 c.arg[1] = i;
196 clearCommandBuffer();
197 SendCommand(&c);
198 if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)) {
199 PrintAndLog("Error occurred, device did not respond during write operation.");
200 return -1;
201 }
202 }
203 return 0;
204 }
205
206 int CmdJablotronSim(const char *Cmd) {
207 uint64_t fullcode = 0;
208
209 char cmdp = param_getchar(Cmd, 0);
210 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_jablotron_sim();
211
212 fullcode = param_get64ex(Cmd, 0, 0, 16);
213
214 // clearing the topbit needed for the preambl detection.
215 if ((fullcode & 0x7FFFFFFFFF) != fullcode) {
216 fullcode &= 0x7FFFFFFFFF;
217 PrintAndLog("Card Number Truncated to 39bits: %"PRIx64, fullcode);
218 }
219
220 uint8_t clk = 64, encoding = 2, separator = 0, invert = 1;
221 uint16_t arg1, arg2;
222 size_t size = 64;
223 arg1 = clk << 8 | encoding;
224 arg2 = invert << 8 | separator;
225
226 PrintAndLog("Simulating Jablotron - FullCode: %"PRIx64, fullcode);
227
228 UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
229 getJablotronBits(fullcode, c.d.asBytes);
230 clearCommandBuffer();
231 SendCommand(&c);
232 return 0;
233 }
234
235 static command_t CommandTable[] = {
236 {"help", CmdHelp, 1, "This help"},
237 {"demod", CmdJablotronDemod, 1, "Attempt to read and extract tag data from the GraphBuffer"},
238 {"read", CmdJablotronRead, 0, "Attempt to read and extract tag data from the antenna"},
239 {"clone", CmdJablotronClone, 0, "clone jablotron tag"},
240 {"sim", CmdJablotronSim, 0, "simulate jablotron tag"},
241 {NULL, NULL, 0, NULL}
242 };
243
244 int CmdLFJablotron(const char *Cmd) {
245 clearCommandBuffer();
246 CmdsParse(CommandTable, Cmd);
247 return 0;
248 }
249
250 int CmdHelp(const char *Cmd) {
251 CmdsHelp(CommandTable);
252 return 0;
253 }
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