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hardnested: reduce disk space for tables (by > 700MBytes) and other minor changes
[proxmark3-svn] / client / cmdlfvisa2000.c
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 visa 2000 tag commands
8 // by iceman
9 // ASK/Manchester, RF/64, STT, 96 bits (complete)
10 //-----------------------------------------------------------------------------
11
12 #include "cmdlfvisa2000.h"
13
14 #include <stdio.h>
15 #include <string.h>
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
87 * aaaaaaaa iiiiiiii -----ppc
88 *
89 * a = fixed value ascii 'VIS2'
90 * i = card id
91 * p = even parity bit for each nibble in card id.
92 * c = checksum (xor of card id)
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);
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 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) {
150 //64*96*2=12288 samples just in case we just missed the first preamble we can still catch 2 of them
151 lf_read(true, 12500);
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 }
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