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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 | //----------------------------------------------------------------------------- |
946a84c3 |
7 | // Low frequency visa 2000 tag commands |
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8 | // by iceman |
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9 | // ASK/Manchester, RF/64, STT, 96 bits (complete) |
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10 | //----------------------------------------------------------------------------- |
11 | |
12 | #include "cmdlfvisa2000.h" |
06919754 |
13 | |
14 | #include <stdio.h> |
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15 | #include <string.h> |
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16 | #include "proxmark3.h" |
17 | #include "ui.h" |
18 | #include "util.h" |
19 | #include "graph.h" |
20 | #include "cmddata.h" // for ASKDemod_ext, g_debugMode, DemodBuffer ... |
21 | #include "cmdmain.h" // for clearCommandBuffer and WaitForResponseTimeout |
22 | #include "cmdlf.h" |
23 | #include "protocols.h" // for T55xx config register definitions |
24 | #include "lfdemod.h" // for Visa2kDemod_AM |
25 | |
26 | #define BL0CK1 0x56495332 |
27 | |
28 | static int CmdHelp(const char *Cmd); |
29 | |
30 | int usage_lf_visa2k_clone(void){ |
31 | PrintAndLog("clone a Visa2000 tag to a T55x7 tag."); |
32 | PrintAndLog("Usage: lf visa2k clone [h] <card ID> <Q5>"); |
33 | PrintAndLog("Options:"); |
34 | PrintAndLog(" h : This help"); |
35 | PrintAndLog(" <card ID> : Visa2k card ID"); |
36 | PrintAndLog(" <Q5> : specify write to Q5 (t5555 instead of t55x7)"); |
37 | PrintAndLog(""); |
38 | PrintAndLog("Sample: lf visa2k clone 112233"); |
39 | return 0; |
40 | } |
41 | |
42 | int usage_lf_visa2k_sim(void) { |
43 | PrintAndLog("Enables simulation of visa2k card with specified card number."); |
44 | PrintAndLog("Simulation runs until the button is pressed or another USB command is issued."); |
45 | PrintAndLog(""); |
46 | PrintAndLog("Usage: lf visa2k sim [h] <card ID>"); |
47 | PrintAndLog("Options:"); |
48 | PrintAndLog(" h : This help"); |
49 | PrintAndLog(" <card ID> : Visa2k card ID"); |
50 | PrintAndLog(""); |
51 | PrintAndLog("Sample: lf visa2k sim 112233"); |
52 | return 0; |
53 | } |
54 | |
55 | static uint8_t visa_chksum( uint32_t id ) { |
56 | uint8_t sum = 0; |
57 | for (uint8_t i = 0; i < 32; i += 4) |
58 | sum ^= (id >> i) & 0xF; |
59 | |
60 | return sum; |
61 | } |
62 | |
63 | static uint8_t visa_parity( uint32_t id) { |
64 | // 4bit parity LUT |
65 | uint8_t par_lut[] = { |
66 | 0,1,1,0 |
67 | ,1,0,0,1 |
68 | ,1,0,0,1 |
69 | ,0,1,1,0 |
70 | }; |
71 | uint8_t par = 0; |
72 | par |= par_lut[ (id >> 28) & 0xF ] << 7; |
73 | par |= par_lut[ (id >> 24) & 0xF ] << 6; |
74 | par |= par_lut[ (id >> 20) & 0xF ] << 5; |
75 | par |= par_lut[ (id >> 16) & 0xF ] << 4; |
76 | par |= par_lut[ (id >> 12) & 0xF ] << 3; |
77 | par |= par_lut[ (id >> 8) & 0xF ] << 2; |
78 | par |= par_lut[ (id >> 4) & 0xF ] << 1; |
79 | par |= par_lut[ (id & 0xF) ]; |
80 | return par; |
81 | } |
82 | |
83 | |
84 | /** |
85 | * |
86 | * 56495332 00096ebd 00000077 —> tag id 618173 |
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87 | * aaaaaaaa iiiiiiii -----ppc |
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88 | * |
89 | * a = fixed value ascii 'VIS2' |
90 | * i = card id |
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91 | * p = even parity bit for each nibble in card id. |
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92 | * c = checksum (xor of card id) |
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93 | * |
94 | **/ |
95 | //see ASKDemod for what args are accepted |
96 | int CmdVisa2kDemod(const char *Cmd) { |
97 | |
98 | //sCmdAskEdgeDetect(""); |
99 | |
100 | //ASK / Manchester |
101 | bool st = true; |
102 | if (!ASKDemod_ext("64 0 0", false, false, 1, &st)) { |
103 | if (g_debugMode) PrintAndLog("DEBUG: Error - Visa2k: ASK/Manchester Demod failed"); |
104 | return 0; |
105 | } |
106 | size_t size = DemodBufferLen; |
107 | int ans = Visa2kDemod_AM(DemodBuffer, &size); |
108 | if (ans < 0){ |
109 | if (g_debugMode){ |
110 | if (ans == -1) |
111 | PrintAndLog("DEBUG: Error - Visa2k: too few bits found"); |
112 | else if (ans == -2) |
113 | PrintAndLog("DEBUG: Error - Visa2k: preamble not found"); |
114 | else if (ans == -3) |
115 | PrintAndLog("DEBUG: Error - Visa2k: Size not correct: %d", size); |
116 | else |
117 | PrintAndLog("DEBUG: Error - Visa2k: ans: %d", ans); |
118 | } |
119 | return 0; |
120 | } |
121 | setDemodBuf(DemodBuffer, 96, ans); |
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122 | setClockGrid(g_DemodClock, g_DemodStartIdx + (ans*g_DemodClock)); |
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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 | uint32_t raw3 = bytebits_to_byte(DemodBuffer+64, 32); |
128 | |
129 | // chksum |
130 | uint8_t calc = visa_chksum(raw2); |
131 | uint8_t chk = raw3 & 0xF; |
132 | |
133 | // test checksums |
134 | if ( chk != calc ) { |
135 | printf("DEBUG: error: Visa2000 checksum failed %x - %x\n", chk, calc); |
136 | return 0; |
137 | } |
138 | // parity |
139 | uint8_t calc_par = visa_parity(raw2); |
140 | uint8_t chk_par = (raw3 & 0xFF0) >> 4; |
141 | if ( calc_par != chk_par) { |
142 | printf("DEBUG: error: Visa2000 parity failed %x - %x\n", chk_par, calc_par); |
143 | return 0; |
144 | } |
145 | PrintAndLog("Visa2000 Tag Found: Card ID %u, Raw: %08X%08X%08X", raw2, raw1 ,raw2, raw3); |
146 | return 1; |
147 | } |
148 | |
149 | int CmdVisa2kRead(const char *Cmd) { |
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150 | //64*96*2=12288 samples just in case we just missed the first preamble we can still catch 2 of them |
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151 | lf_read(true, 12500); |
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152 | return CmdVisa2kDemod(Cmd); |
153 | } |
154 | |
155 | int CmdVisa2kClone(const char *Cmd) { |
156 | |
157 | uint64_t id = 0; |
158 | uint32_t blocks[4] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_64 | T55x7_ST_TERMINATOR | 3 << T55x7_MAXBLOCK_SHIFT, BL0CK1, 0}; |
159 | |
160 | char cmdp = param_getchar(Cmd, 0); |
161 | if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_clone(); |
162 | |
163 | id = param_get32ex(Cmd, 0, 0, 10); |
164 | |
165 | //Q5 |
166 | if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q') { |
167 | //t5555 (Q5) BITRATE = (RF-2)/2 (iceman) |
168 | blocks[0] = T5555_MODULATION_MANCHESTER | ((64-2)>>1) << T5555_BITRATE_SHIFT | T5555_ST_TERMINATOR | 3 << T5555_MAXBLOCK_SHIFT; |
169 | } |
170 | |
171 | blocks[2] = id; |
172 | blocks[3] = (visa_parity(id) << 4) | visa_chksum(id); |
173 | |
174 | PrintAndLog("Preparing to clone Visa2000 to T55x7 with CardId: %u", id); |
175 | PrintAndLog("Blk | Data "); |
176 | PrintAndLog("----+------------"); |
177 | for(int i = 0; i<4; ++i) |
178 | PrintAndLog(" %02d | 0x%08x", i , blocks[i]); |
179 | |
180 | UsbCommand resp; |
181 | UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}}; |
182 | |
183 | for (int i = 3; i >= 0; --i) { |
184 | c.arg[0] = blocks[i]; |
185 | c.arg[1] = i; |
186 | clearCommandBuffer(); |
187 | SendCommand(&c); |
188 | if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)){ |
189 | PrintAndLog("Error occurred, device did not respond during write operation."); |
190 | return -1; |
191 | } |
192 | } |
193 | return 0; |
194 | } |
195 | |
196 | int CmdVisa2kSim(const char *Cmd) { |
197 | |
198 | uint32_t id = 0; |
199 | char cmdp = param_getchar(Cmd, 0); |
200 | if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_sim(); |
201 | |
202 | id = param_get32ex(Cmd, 0, 0, 10); |
203 | |
204 | uint8_t clk = 64, encoding = 1, separator = 1, invert = 0; |
205 | uint16_t arg1, arg2; |
206 | size_t size = 96; |
207 | arg1 = clk << 8 | encoding; |
208 | arg2 = invert << 8 | separator; |
209 | |
210 | PrintAndLog("Simulating Visa2000 - CardId: %u", id); |
211 | |
212 | UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}}; |
213 | |
214 | uint32_t blocks[3] = { BL0CK1, id, (visa_parity(id) << 4) | visa_chksum(id) }; |
215 | |
216 | for(int i=0; i<3; ++i) |
217 | num_to_bytebits(blocks[i], 32, c.d.asBytes + i*32); |
218 | |
219 | clearCommandBuffer(); |
220 | SendCommand(&c); |
221 | return 0; |
222 | } |
223 | |
224 | static command_t CommandTable[] = { |
225 | {"help", CmdHelp, 1, "This help"}, |
226 | {"demod", CmdVisa2kDemod, 1, "Attempt to demod from GraphBuffer"}, |
227 | {"read", CmdVisa2kRead, 0, "Attempt to read and extract tag data"}, |
228 | {"clone", CmdVisa2kClone, 0, "clone Visa2000 tag"}, |
229 | {"sim", CmdVisa2kSim, 0, "simulate Visa2000 tag"}, |
230 | {NULL, NULL, 0, NULL} |
231 | }; |
232 | |
233 | int CmdLFVisa2k(const char *Cmd) { |
234 | clearCommandBuffer(); |
235 | CmdsParse(CommandTable, Cmd); |
236 | return 0; |
237 | } |
238 | |
239 | int CmdHelp(const char *Cmd) { |
240 | CmdsHelp(CommandTable); |
241 | return 0; |
242 | } |