| 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 visa2000 clone [h] <card ID> <Q5>"); |
| 33 | PrintAndLog("Options:"); |
| 34 | PrintAndLog(" h : This help"); |
| 35 | PrintAndLog(" <card ID> : Visa2000 card ID"); |
| 36 | PrintAndLog(" <Q5> : specify write to Q5 (t5555 instead of t55x7)"); |
| 37 | PrintAndLog(""); |
| 38 | PrintAndLog("Sample: lf visa2000 clone 112233"); |
| 39 | return 0; |
| 40 | } |
| 41 | |
| 42 | int usage_lf_visa2k_sim(void) { |
| 43 | PrintAndLog("Enables simulation of visa2000 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 visa2000 sim [h] <card ID>"); |
| 47 | PrintAndLog("Options:"); |
| 48 | PrintAndLog(" h : This help"); |
| 49 | PrintAndLog(" <card ID> : Visa2000 card ID"); |
| 50 | PrintAndLog(""); |
| 51 | PrintAndLog("Sample: lf visa2000 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 - Visa2000: 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 - Visa2000: too few bits found"); |
| 112 | else if (ans == -2) |
| 113 | PrintAndLog("DEBUG: Error - Visa2000: preamble not found"); |
| 114 | else if (ans == -3) |
| 115 | PrintAndLog("DEBUG: Error - Visa2000: Size not correct: %d", size); |
| 116 | else |
| 117 | PrintAndLog("DEBUG: Error - Visa2000: 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 | } |