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371535d5 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 Presco tag commands
8//-----------------------------------------------------------------------------
9
10#include "cmdlfvisa2000.h"
11
0a7e86db 12#define BL0CK1 0x56495332
13
371535d5 14static int CmdHelp(const char *Cmd);
15
16int usage_lf_visa2k_clone(void){
17 PrintAndLog("clone a Visa2000 tag to a T55x7 tag.");
18 PrintAndLog("Usage: lf visa2k clone [h] <card ID> <Q5>");
19 PrintAndLog("Options:");
20 PrintAndLog(" h : This help");
21 PrintAndLog(" <card ID> : Visa2k card ID");
22 PrintAndLog(" <Q5> : specify write to Q5 (t5555 instead of t55x7)");
23 PrintAndLog("");
24 PrintAndLog("Sample: lf visa2k clone 112233");
25 return 0;
26}
27
28int usage_lf_visa2k_sim(void) {
29 PrintAndLog("Enables simulation of visa2k card with specified card number.");
30 PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
31 PrintAndLog("");
32 PrintAndLog("Usage: lf visa2k sim [h] <card ID>");
33 PrintAndLog("Options:");
34 PrintAndLog(" h : This help");
35 PrintAndLog(" <card ID> : Visa2k card ID");
36 PrintAndLog("");
37 PrintAndLog("Sample: lf visa2k sim 112233");
38 return 0;
39}
40
0a7e86db 41static uint8_t visa_chksum( uint32_t id ) {
42 uint8_t sum = 0;
43 for (uint8_t i = 0; i < 32; i += 4)
44 sum ^= (id >> i) & 0xF;
45 return sum & 0xF;
46}
47
fb26bb54 48static uint8_t visa_parity( uint32_t id) {
49 // 4bit parity LUT
50 uint8_t par_lut[] = {
51 0,1,1,0
52 ,1,0,0,1
53 ,1,0,0,1
54 ,0,1,1,0
55 };
56 uint8_t par = 0;
dc873169 57 par |= par_lut[ NIBBLE_HIGH( (id >> 24) & 0xFF) ] << 7;
58 par |= par_lut[ NIBBLE_LOW( (id >> 24) & 0xFF) ] << 6;
59 par |= par_lut[ NIBBLE_HIGH( (id >> 16) & 0xFF) ] << 5;
60 par |= par_lut[ NIBBLE_LOW( (id >> 16) & 0xFF) ] << 4;
fb26bb54 61 par |= par_lut[ NIBBLE_HIGH( (id >> 8) & 0xFF) ] << 3;
62 par |= par_lut[ NIBBLE_LOW( (id >> 8) & 0xFF) ] << 2;
63 par |= par_lut[ NIBBLE_HIGH( id & 0xFF ) ] << 1;
64 par |= par_lut[ NIBBLE_LOW( id & 0xFF) ];
65 return par;
66}
67
68
ff9c043d 69/**
70*
71* 56495332 00096ebd 00000077 —> tag id 618173
72* aaaaaaaa iiiiiiii -----..c
73*
74* a = fixed value ascii 'VIS2'
75* i = card id
76* c = checksum (xor of card id)
77* . = unknown
78*
79**/
371535d5 80//see ASKDemod for what args are accepted
81int CmdVisa2kDemod(const char *Cmd) {
82
92014925 83 // save GraphBuffer - to restore it later
84 save_restoreGB(1);
85
4eabb8ad 86 //sCmdAskEdgeDetect("");
92014925 87
371535d5 88 //ASK / Manchester
0a7e86db 89 bool st = TRUE;
371535d5 90 if (!ASKDemod_ext("64 0 0", FALSE, FALSE, 1, &st)) {
91 if (g_debugMode) PrintAndLog("DEBUG: Error - Visa2k: ASK/Manchester Demod failed");
92014925 92 save_restoreGB(0);
371535d5 93 return 0;
94 }
95 size_t size = DemodBufferLen;
96 int ans = Visa2kDemod_AM(DemodBuffer, &size);
97 if (ans < 0){
98 if (g_debugMode){
99 if (ans == -1)
100 PrintAndLog("DEBUG: Error - Visa2k: too few bits found");
101 else if (ans == -2)
102 PrintAndLog("DEBUG: Error - Visa2k: preamble not found");
103 else if (ans == -3)
104 PrintAndLog("DEBUG: Error - Visa2k: Size not correct: %d", size);
105 else
106 PrintAndLog("DEBUG: Error - Visa2k: ans: %d", ans);
107 }
92014925 108 save_restoreGB(0);
371535d5 109 return 0;
110 }
111 setDemodBuf(DemodBuffer, 96, ans);
4eabb8ad 112 setGrid_Clock(64);
113
371535d5 114 //got a good demod
115 uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
116 uint32_t raw2 = bytebits_to_byte(DemodBuffer+32, 32);
117 uint32_t raw3 = bytebits_to_byte(DemodBuffer+64, 32);
ff9c043d 118
0a7e86db 119 // chksum
120 uint8_t calc = visa_chksum(raw2);
121 uint8_t chk = raw3 & 0xF;
fb26bb54 122
0a7e86db 123 // test checksums
124 if ( chk != calc ) {
125 printf("DEBUG: error: Visa2000 checksum failed %x - %x\n", chk, calc);
92014925 126 save_restoreGB(0);
0a7e86db 127 return 0;
128 }
fb26bb54 129 // parity
130 uint8_t calc_par = visa_parity(raw2);
dc873169 131 uint8_t chk_par = (raw3 & 0xFF0) >> 4;
fb26bb54 132 if ( calc_par != chk_par) {
133 printf("DEBUG: error: Visa2000 parity failed %x - %x\n", chk_par, calc_par);
134 save_restoreGB(0);
135 return 0;
136 }
371535d5 137 PrintAndLog("Visa2000 Tag Found: Card ID %u, Raw: %08X%08X%08X", raw2, raw1 ,raw2, raw3);
92014925 138 save_restoreGB(0);
371535d5 139 return 1;
140}
141
672d72de 142// 64*96*2=12288 samples just in case we just missed the first preamble we can still catch 2 of them
371535d5 143int CmdVisa2kRead(const char *Cmd) {
144 CmdLFRead("s");
672d72de 145 getSamples("12500",TRUE);
371535d5 146 return CmdVisa2kDemod(Cmd);
147}
148
149int CmdVisa2kClone(const char *Cmd) {
150
151 uint64_t id = 0;
ff9c043d 152 uint32_t blocks[4] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_64 | T55x7_ST_TERMINATOR | 3 << T55x7_MAXBLOCK_SHIFT, BL0CK1, 0};
371535d5 153
371535d5 154 char cmdp = param_getchar(Cmd, 0);
155 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_clone();
156
157 id = param_get32ex(Cmd, 0, 0, 10);
158
159 //Q5
160 if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q') {
161 //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
ff9c043d 162 blocks[0] = T5555_MODULATION_MANCHESTER | ((64-2)>>1) << T5555_BITRATE_SHIFT | T5555_ST_TERMINATOR | 3 << T5555_MAXBLOCK_SHIFT;
371535d5 163 }
164
371535d5 165 //
371535d5 166 blocks[2] = id;
fb26bb54 167 blocks[3] = (visa_parity(id) << 4) | visa_chksum(id);
371535d5 168
169 PrintAndLog("Preparing to clone Visa2000 to T55x7 with CardId: %u", id);
170 PrintAndLog("Blk | Data ");
171 PrintAndLog("----+------------");
3375daee 172 for(int i = 0; i<4; ++i)
3acac886 173 PrintAndLog(" %02d | 0x%08x", i , blocks[i]);
371535d5 174
175 UsbCommand resp;
176 UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
177
178 for (int i = 3; i >= 0; --i) {
179 c.arg[0] = blocks[i];
180 c.arg[1] = i;
181 clearCommandBuffer();
182 SendCommand(&c);
42c235e7 183 if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)){
371535d5 184 PrintAndLog("Error occurred, device did not respond during write operation.");
185 return -1;
186 }
187 }
188 return 0;
189}
190
191int CmdVisa2kSim(const char *Cmd) {
192
193 uint32_t id = 0;
194 char cmdp = param_getchar(Cmd, 0);
195 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_sim();
196
197 id = param_get32ex(Cmd, 0, 0, 10);
198
199 uint8_t clk = 64, encoding = 1, separator = 1, invert = 0;
200 uint16_t arg1, arg2;
201 size_t size = 96;
202 arg1 = clk << 8 | encoding;
203 arg2 = invert << 8 | separator;
204
205 PrintAndLog("Simulating Visa2000 - CardId: %u", id);
206
207 UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
371535d5 208
fb26bb54 209 uint32_t blocks[3] = { BL0CK1, id, (visa_parity(id) << 4) | visa_chksum(id) };
0a7e86db 210
672d72de 211 for(int i = 0; i < 3; ++i)
371535d5 212 num_to_bytebits(blocks[i], 32, c.d.asBytes + i*32);
0a7e86db 213
371535d5 214 clearCommandBuffer();
215 SendCommand(&c);
216 return 0;
217}
218
219static command_t CommandTable[] = {
220 {"help", CmdHelp, 1, "This help"},
672d72de 221 {"demod", CmdVisa2kDemod, 1, "Attempt to demod from GraphBuffer"},
371535d5 222 {"read", CmdVisa2kRead, 0, "Attempt to read and extract tag data"},
223 {"clone", CmdVisa2kClone, 0, "clone Visa2000 tag"},
224 {"sim", CmdVisa2kSim, 0, "simulate Visa2000 tag"},
225 {NULL, NULL, 0, NULL}
226};
227
228int CmdLFVisa2k(const char *Cmd) {
229 clearCommandBuffer();
230 CmdsParse(CommandTable, Cmd);
231 return 0;
232}
233
234int CmdHelp(const char *Cmd) {
235 CmdsHelp(CommandTable);
236 return 0;
237}
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