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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 #include <string.h>
13 #include <inttypes.h>
14 #include <stdbool.h>
15 #include "proxmark3.h"
16 #include "ui.h"
17 #include "util.h"
18 #include "graph.h"
19 #include "cmdparser.h"
20 #include "cmddata.h"
21 #include "cmdmain.h"
22 #include "cmdlf.h"
23 #include "protocols.h" // for T55xx config register definitions
24 #include "lfdemod.h" // parityTest
25
26 static int CmdHelp(const char *Cmd);
27
28 int usage_lf_jablotron_clone(void) {
29 PrintAndLog("clone a Jablotron tag to a T55x7 tag.");
30 PrintAndLog("Usage: lf jablotron clone [h] <card ID> <Q5>");
31 PrintAndLog("Options:");
32 PrintAndLog(" h : This help");
33 PrintAndLog(" <card ID> : jablotron card ID");
34 PrintAndLog(" <Q5> : specify write to Q5 (t5555 instead of t55x7)");
35 PrintAndLog("");
36 PrintAndLog("Sample: lf jablotron clone 112233");
37 return 0;
38 }
39
40 int usage_lf_jablotron_sim(void) {
41 PrintAndLog("Enables simulation of jablotron card with specified card number.");
42 PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
43 PrintAndLog("");
44 PrintAndLog("Usage: lf jablotron sim [h] <card ID>");
45 PrintAndLog("Options:");
46 PrintAndLog(" h : This help");
47 PrintAndLog(" <card ID> : jablotron card ID");
48 PrintAndLog("");
49 PrintAndLog("Sample: lf jablotron sim 112233");
50 return 0;
51 }
52
53 static uint8_t jablontron_chksum(uint8_t *bits) {
54 uint8_t chksum = 0;
55 for (int i=16; i < 56; i += 8) {
56 chksum += bytebits_to_byte(bits+i,8);
57 }
58 chksum ^= 0x3A;
59 return chksum;
60 }
61
62 int getJablotronBits(uint64_t fullcode, uint8_t *bits) {
63 //preamp
64 num_to_bytebits(0xFFFF, 16, bits);
65
66 //fullcode
67 num_to_bytebits(fullcode, 40, bits+16);
68
69 //chksum byte
70 uint8_t chksum = jablontron_chksum(bits);
71 num_to_bytebits(chksum, 8, bits+56);
72 return 1;
73 }
74
75 // ASK/Diphase fc/64 (inverted Biphase)
76 // Note: this is not a demod, this is only a detection
77 // the parameter *bits needs to be demoded before call
78 // 0xFFFF preamble, 64bits
79 int JablotronDetect(uint8_t *bits, size_t *size) {
80 if (*size < 64*2) return -1; //make sure buffer has enough data
81 size_t startIdx = 0;
82 uint8_t preamble[] = {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0};
83 if (preambleSearch(bits, preamble, sizeof(preamble), size, &startIdx) == 0)
84 return -2; //preamble not found
85 if (*size != 64) return -3; // wrong demoded size
86
87 uint8_t checkchksum = jablontron_chksum(bits+startIdx);
88 uint8_t crc = bytebits_to_byte(bits+startIdx+56, 8);
89 if ( checkchksum != crc ) return -5;
90 return (int)startIdx;
91 }
92
93 //see ASKDemod for what args are accepted
94 int CmdJablotronDemod(const char *Cmd) {
95
96 //Differential Biphase / di-phase (inverted biphase)
97 //get binary from ask wave
98 if (!ASKbiphaseDemod("0 64 1 0", false)) {
99 if (g_debugMode) PrintAndLog("DEBUG: Error - Jablotron ASKbiphaseDemod failed");
100 return 0;
101 }
102 size_t size = DemodBufferLen;
103 int ans = JablotronDetect(DemodBuffer, &size);
104 if (ans < 0) {
105 if (g_debugMode) {
106 if (ans == -1)
107 PrintAndLog("DEBUG: Error - Jablotron too few bits found");
108 else if (ans == -2)
109 PrintAndLog("DEBUG: Error - Jablotron preamble not found");
110 else if (ans == -3)
111 PrintAndLog("DEBUG: Error - Jablotron size not correct: %d", size);
112 else if (ans == -5)
113 PrintAndLog("DEBUG: Error - Jablotron checksum failed");
114 else
115 PrintAndLog("DEBUG: Error - Jablotron ans: %d", ans);
116 }
117 return 0;
118 }
119
120 setDemodBuf(DemodBuffer, 64, ans);
121 setClockGrid(g_DemodClock, g_DemodStartIdx + (ans*g_DemodClock));
122
123 //got a good demod
124 uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
125 uint32_t raw2 = bytebits_to_byte(DemodBuffer+32, 32);
126
127 uint64_t id = (( (uint64_t)bytebits_to_byte(DemodBuffer+16, 8) )<< 32) | bytebits_to_byte(DemodBuffer+24,32);
128
129 PrintAndLog("Jablotron Tag Found: Card ID: %"PRIx64" :: Raw: %08X%08X", id, raw1, raw2);
130
131 uint8_t chksum = raw2 & 0xFF;
132 PrintAndLog("Checksum: %02X [OK]", chksum);
133
134 // Printed format: 1410-nn-nnnn-nnnn
135 PrintAndLog("Printed: 1410-%02X-%04X-%04X",
136 (uint8_t)(id >> 32) & 0xFF,
137 (uint16_t)(id >> 16) & 0xFFFF,
138 (uint16_t)id & 0xFFFF
139 );
140 return 1;
141 }
142
143 int CmdJablotronRead(const char *Cmd) {
144 lf_read(true, 10000);
145 return CmdJablotronDemod(Cmd);
146 }
147
148 int CmdJablotronClone(const char *Cmd) {
149
150 uint64_t fullcode = 0;
151 uint32_t blocks[3] = {T55x7_MODULATION_DIPHASE | T55x7_BITRATE_RF_64 | 2 << T55x7_MAXBLOCK_SHIFT, 0, 0};
152
153 uint8_t bits[64];
154 uint8_t *bs = bits;
155 memset(bs, 0, sizeof(bits));
156
157 char cmdp = param_getchar(Cmd, 0);
158 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_jablotron_clone();
159
160 fullcode = param_get64ex(Cmd, 0, 0, 16);
161
162 //Q5
163 if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q') {
164 //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
165 blocks[0] = T5555_MODULATION_BIPHASE | T5555_INVERT_OUTPUT | ((64-2)>>1) << T5555_BITRATE_SHIFT | 2 << T5555_MAXBLOCK_SHIFT;
166 }
167
168 // clearing the topbit needed for the preambl detection.
169 if ((fullcode & 0x7FFFFFFFFF) != fullcode) {
170 fullcode &= 0x7FFFFFFFFF;
171 PrintAndLog("Card Number Truncated to 39bits: %"PRIx64, fullcode);
172 }
173
174 if ( !getJablotronBits(fullcode, bs)) {
175 PrintAndLog("Error with tag bitstream generation.");
176 return 1;
177 }
178
179 blocks[1] = bytebits_to_byte(bs,32);
180 blocks[2] = bytebits_to_byte(bs+32,32);
181
182 PrintAndLog("Preparing to clone Jablotron to T55x7 with FullCode: %"PRIx64, fullcode);
183 PrintAndLog("Blk | Data ");
184 PrintAndLog("----+------------");
185 PrintAndLog(" 00 | 0x%08x", blocks[0]);
186 PrintAndLog(" 01 | 0x%08x", blocks[1]);
187 PrintAndLog(" 02 | 0x%08x", blocks[2]);
188
189 UsbCommand resp;
190 UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
191
192 for (int i = 2; i >= 0; --i) {
193 c.arg[0] = blocks[i];
194 c.arg[1] = i;
195 clearCommandBuffer();
196 SendCommand(&c);
197 if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)) {
198 PrintAndLog("Error occurred, device did not respond during write operation.");
199 return -1;
200 }
201 }
202 return 0;
203 }
204
205 int CmdJablotronSim(const char *Cmd) {
206 uint64_t fullcode = 0;
207
208 char cmdp = param_getchar(Cmd, 0);
209 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_jablotron_sim();
210
211 fullcode = param_get64ex(Cmd, 0, 0, 16);
212
213 // clearing the topbit needed for the preambl detection.
214 if ((fullcode & 0x7FFFFFFFFF) != fullcode) {
215 fullcode &= 0x7FFFFFFFFF;
216 PrintAndLog("Card Number Truncated to 39bits: %"PRIx64, fullcode);
217 }
218
219 uint8_t clk = 64, encoding = 2, separator = 0, invert = 1;
220 uint16_t arg1, arg2;
221 size_t size = 64;
222 arg1 = clk << 8 | encoding;
223 arg2 = invert << 8 | separator;
224
225 PrintAndLog("Simulating Jablotron - FullCode: %"PRIx64, fullcode);
226
227 UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
228 getJablotronBits(fullcode, c.d.asBytes);
229 clearCommandBuffer();
230 SendCommand(&c);
231 return 0;
232 }
233
234 static command_t CommandTable[] = {
235 {"help", CmdHelp, 1, "This help"},
236 {"demod", CmdJablotronDemod, 1, "Attempt to read and extract tag data from the GraphBuffer"},
237 {"read", CmdJablotronRead, 0, "Attempt to read and extract tag data from the antenna"},
238 {"clone", CmdJablotronClone, 0, "clone jablotron tag"},
239 {"sim", CmdJablotronSim, 0, "simulate jablotron tag"},
240 {NULL, NULL, 0, NULL}
241 };
242
243 int CmdLFJablotron(const char *Cmd) {
244 clearCommandBuffer();
245 CmdsParse(CommandTable, Cmd);
246 return 0;
247 }
248
249 int CmdHelp(const char *Cmd) {
250 CmdsHelp(CommandTable);
251 return 0;
252 }
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