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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 Presco tag commands
8 //-----------------------------------------------------------------------------
9
10 #include "cmdlfvisa2000.h"
11
12 #define BL0CK1 0x56495332
13
14 static int CmdHelp(const char *Cmd);
15
16 int 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
28 int 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
41 static 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
48 //see ASKDemod for what args are accepted
49 int CmdVisa2kDemod(const char *Cmd) {
50
51 // save GraphBuffer - to restore it later
52 save_restoreGB(1);
53
54 CmdAskEdgeDetect("");
55
56 //ASK / Manchester
57 bool st = TRUE;
58 if (!ASKDemod_ext("64 0 0", FALSE, FALSE, 1, &st)) {
59 if (g_debugMode) PrintAndLog("DEBUG: Error - Visa2k: ASK/Manchester Demod failed");
60 save_restoreGB(0);
61 return 0;
62 }
63 size_t size = DemodBufferLen;
64 int ans = Visa2kDemod_AM(DemodBuffer, &size);
65 if (ans < 0){
66 if (g_debugMode){
67 if (ans == -1)
68 PrintAndLog("DEBUG: Error - Visa2k: too few bits found");
69 else if (ans == -2)
70 PrintAndLog("DEBUG: Error - Visa2k: preamble not found");
71 else if (ans == -3)
72 PrintAndLog("DEBUG: Error - Visa2k: Size not correct: %d", size);
73 else
74 PrintAndLog("DEBUG: Error - Visa2k: ans: %d", ans);
75 }
76 save_restoreGB(0);
77 return 0;
78 }
79 setDemodBuf(DemodBuffer, 96, ans);
80
81 //got a good demod
82 uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
83 uint32_t raw2 = bytebits_to_byte(DemodBuffer+32, 32);
84 uint32_t raw3 = bytebits_to_byte(DemodBuffer+64, 32);
85
86 // chksum
87 uint8_t calc = visa_chksum(raw2);
88 uint8_t chk = raw3 & 0xF;
89 // test checksums
90 if ( chk != calc ) {
91 printf("DEBUG: error: Visa2000 checksum failed %x - %x\n", chk, calc);
92 save_restoreGB(0);
93 return 0;
94 }
95 PrintAndLog("Visa2000 Tag Found: Card ID %u, Raw: %08X%08X%08X", raw2, raw1 ,raw2, raw3);
96 save_restoreGB(0);
97 return 1;
98 }
99
100 int CmdVisa2kRead(const char *Cmd) {
101 CmdLFRead("s");
102 getSamples("20000",TRUE);
103 return CmdVisa2kDemod(Cmd);
104 }
105
106 int CmdVisa2kClone(const char *Cmd) {
107
108 uint64_t id = 0;
109 uint32_t blocks[4] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_64 | T55x7_ST_TERMINATOR |3<<T55x7_MAXBLOCK_SHIFT, BL0CK1, 0};
110
111 char cmdp = param_getchar(Cmd, 0);
112 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_clone();
113
114 id = param_get32ex(Cmd, 0, 0, 10);
115
116 //Q5
117 if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q') {
118 //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
119 blocks[0] = T5555_MODULATION_MANCHESTER | 64<<T5555_BITRATE_SHIFT | T5555_ST_TERMINATOR | 3<<T5555_MAXBLOCK_SHIFT;
120 }
121
122 //
123 blocks[2] = id;
124 blocks[3] = visa_chksum( id);
125
126 PrintAndLog("Preparing to clone Visa2000 to T55x7 with CardId: %u", id);
127 PrintAndLog("Blk | Data ");
128 PrintAndLog("----+------------");
129 for(int i = 0; i<4; ++i)
130 PrintAndLog(" %02d | 0x%08x", i , blocks[i]);
131
132 UsbCommand resp;
133 UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
134
135 for (int i = 3; i >= 0; --i) {
136 c.arg[0] = blocks[i];
137 c.arg[1] = i;
138 clearCommandBuffer();
139 SendCommand(&c);
140 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){
141 PrintAndLog("Error occurred, device did not respond during write operation.");
142 return -1;
143 }
144 }
145 return 0;
146 }
147
148 int CmdVisa2kSim(const char *Cmd) {
149
150 uint32_t id = 0;
151 char cmdp = param_getchar(Cmd, 0);
152 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_sim();
153
154 id = param_get32ex(Cmd, 0, 0, 10);
155
156 uint8_t clk = 64, encoding = 1, separator = 1, invert = 0;
157 uint16_t arg1, arg2;
158 size_t size = 96;
159 arg1 = clk << 8 | encoding;
160 arg2 = invert << 8 | separator;
161
162 PrintAndLog("Simulating Visa2000 - CardId: %u", id);
163
164 UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
165
166 uint32_t blocks[3] = { BL0CK1, id, visa_chksum(id) };
167
168 for(int i=0; i<3; ++i)
169 num_to_bytebits(blocks[i], 32, c.d.asBytes + i*32);
170
171 clearCommandBuffer();
172 SendCommand(&c);
173 return 0;
174 }
175
176 static command_t CommandTable[] = {
177 {"help", CmdHelp, 1, "This help"},
178 {"read", CmdVisa2kRead, 0, "Attempt to read and extract tag data"},
179 {"clone", CmdVisa2kClone, 0, "clone Visa2000 tag"},
180 {"sim", CmdVisa2kSim, 0, "simulate Visa2000 tag"},
181 {NULL, NULL, 0, NULL}
182 };
183
184 int CmdLFVisa2k(const char *Cmd) {
185 clearCommandBuffer();
186 CmdsParse(CommandTable, Cmd);
187 return 0;
188 }
189
190 int CmdHelp(const char *Cmd) {
191 CmdsHelp(CommandTable);
192 return 0;
193 }
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