mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-09-21 07:46:12 +08:00
244 lines
7.9 KiB
C
244 lines
7.9 KiB
C
//-----------------------------------------------------------------------------
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// Low frequency visa 2000 tag commands
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// by iceman
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// ASK/Manchester, RF/64, STT, 96 bits (complete)
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//-----------------------------------------------------------------------------
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#include "cmdlfvisa2000.h"
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#define BL0CK1 0x56495332
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static int CmdHelp(const char *Cmd);
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int usage_lf_visa2k_clone(void) {
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PrintAndLogEx(NORMAL, "clone a Visa2000 tag to a T55x7 tag.");
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PrintAndLogEx(NORMAL, "Usage: lf visa2000 clone [h] <card ID> <Q5>");
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PrintAndLogEx(NORMAL, "Options:");
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PrintAndLogEx(NORMAL, " h : This help");
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PrintAndLogEx(NORMAL, " <card ID> : Visa2k card ID");
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PrintAndLogEx(NORMAL, " <Q5> : specify write to Q5 (t5555 instead of t55x7)");
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PrintAndLogEx(NORMAL, "");
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PrintAndLogEx(NORMAL, "Examples:");
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PrintAndLogEx(NORMAL, " lf visa2000 clone 112233");
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return 0;
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}
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int usage_lf_visa2k_sim(void) {
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PrintAndLogEx(NORMAL, "Enables simulation of visa2k card with specified card number.");
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PrintAndLogEx(NORMAL, "Simulation runs until the button is pressed or another USB command is issued.");
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PrintAndLogEx(NORMAL, "");
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PrintAndLogEx(NORMAL, "Usage: lf visa2000 sim [h] <card ID>");
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PrintAndLogEx(NORMAL, "Options:");
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PrintAndLogEx(NORMAL, " h : This help");
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PrintAndLogEx(NORMAL, " <card ID> : Visa2k card ID");
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PrintAndLogEx(NORMAL, "");
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PrintAndLogEx(NORMAL, "Examples:");
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PrintAndLogEx(NORMAL, " lf visa2000 sim 112233");
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return 0;
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}
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static uint8_t visa_chksum(uint32_t id) {
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uint8_t sum = 0;
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for (uint8_t i = 0; i < 32; i += 4)
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sum ^= (id >> i) & 0xF;
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return sum & 0xF;
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}
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static uint8_t visa_parity(uint32_t id) {
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// 4bit parity LUT
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uint8_t par_lut[] = {
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0, 1, 1, 0
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, 1, 0, 0, 1
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, 1, 0, 0, 1
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, 0, 1, 1, 0
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};
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uint8_t par = 0;
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par |= par_lut[(id >> 28) & 0xF ] << 7;
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par |= par_lut[(id >> 24) & 0xF ] << 6;
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par |= par_lut[(id >> 20) & 0xF ] << 5;
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par |= par_lut[(id >> 16) & 0xF ] << 4;
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par |= par_lut[(id >> 12) & 0xF ] << 3;
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par |= par_lut[(id >> 8) & 0xF ] << 2;
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par |= par_lut[(id >> 4) & 0xF ] << 1;
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par |= par_lut[(id & 0xF) ];
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return par;
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}
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// by iceman
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// find Visa2000 preamble in already demoded data
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int detectVisa2k(uint8_t *dest, size_t *size) {
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if (*size < 96) return -1; //make sure buffer has data
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size_t startIdx = 0;
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uint8_t preamble[] = {0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0};
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if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
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return -2; //preamble not found
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if (*size != 96) return -3; //wrong demoded size
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//return start position
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return (int)startIdx;
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}
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/**
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*
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* 56495332 00096ebd 00000077 —> tag id 618173
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* aaaaaaaa iiiiiiii -----ppc
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*
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* a = fixed value ascii 'VIS2'
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* i = card id
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* p = even parity bit for each nibble in card id.
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* c = checksum (xor of card id)
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*
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**/
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//see ASKDemod for what args are accepted
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int CmdVisa2kDemod(const char *Cmd) {
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save_restoreGB(GRAPH_SAVE);
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//sCmdAskEdgeDetect("");
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//ASK / Manchester
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bool st = true;
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if (!ASKDemod_ext("64 0 0", false, false, 1, &st)) {
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PrintAndLogEx(DEBUG, "DEBUG: Error - Visa2k: ASK/Manchester Demod failed");
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save_restoreGB(GRAPH_RESTORE);
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return 0;
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}
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size_t size = DemodBufferLen;
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int ans = detectVisa2k(DemodBuffer, &size);
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if (ans < 0) {
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if (ans == -1)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Visa2k: too few bits found");
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else if (ans == -2)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Visa2k: preamble not found");
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else if (ans == -3)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Visa2k: Size not correct: %d", size);
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else
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PrintAndLogEx(DEBUG, "DEBUG: Error - Visa2k: ans: %d", ans);
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save_restoreGB(GRAPH_RESTORE);
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return 0;
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}
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setDemodBuf(DemodBuffer, 96, ans);
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setClockGrid(g_DemodClock, g_DemodStartIdx + (ans * g_DemodClock));
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//got a good demod
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uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
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uint32_t raw2 = bytebits_to_byte(DemodBuffer + 32, 32);
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uint32_t raw3 = bytebits_to_byte(DemodBuffer + 64, 32);
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// chksum
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uint8_t calc = visa_chksum(raw2);
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uint8_t chk = raw3 & 0xF;
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// test checksums
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if (chk != calc) {
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PrintAndLogEx(DEBUG, "DEBUG: error: Visa2000 checksum failed %x - %x\n", chk, calc);
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save_restoreGB(GRAPH_RESTORE);
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return 0;
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}
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// parity
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uint8_t calc_par = visa_parity(raw2);
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uint8_t chk_par = (raw3 & 0xFF0) >> 4;
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if (calc_par != chk_par) {
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PrintAndLogEx(DEBUG, "DEBUG: error: Visa2000 parity failed %x - %x\n", chk_par, calc_par);
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save_restoreGB(GRAPH_RESTORE);
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return 0;
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}
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PrintAndLogEx(SUCCESS, "Visa2000 Tag Found: Card ID %u, Raw: %08X%08X%08X", raw2, raw1, raw2, raw3);
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return 1;
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}
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// 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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int CmdVisa2kRead(const char *Cmd) {
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lf_read(true, 20000);
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return CmdVisa2kDemod(Cmd);
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}
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int CmdVisa2kClone(const char *Cmd) {
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uint64_t id = 0;
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uint32_t blocks[4] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_64 | T55x7_ST_TERMINATOR | 3 << T55x7_MAXBLOCK_SHIFT, BL0CK1, 0};
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char cmdp = tolower(param_getchar(Cmd, 0));
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if (strlen(Cmd) == 0 || cmdp == 'h') return usage_lf_visa2k_clone();
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id = param_get32ex(Cmd, 0, 0, 10);
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//Q5
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if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q')
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blocks[0] = T5555_MODULATION_MANCHESTER | T5555_SET_BITRATE(64) | T5555_ST_TERMINATOR | 3 << T5555_MAXBLOCK_SHIFT;
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blocks[2] = id;
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blocks[3] = (visa_parity(id) << 4) | visa_chksum(id);
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PrintAndLogEx(INFO, "Preparing to clone Visa2000 to T55x7 with CardId: %u", id);
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print_blocks(blocks, 4);
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UsbCommand resp;
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UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0, 0, 0}};
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for (uint8_t i = 0; i < 4; i++) {
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c.arg[0] = blocks[i];
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c.arg[1] = i;
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clearCommandBuffer();
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SendCommand(&c);
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if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)) {
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PrintAndLogEx(WARNING, "Error occurred, device did not respond during write operation.");
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return -1;
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}
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}
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return 0;
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}
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int CmdVisa2kSim(const char *Cmd) {
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uint32_t id = 0;
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char cmdp = param_getchar(Cmd, 0);
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if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_sim();
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id = param_get32ex(Cmd, 0, 0, 10);
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uint8_t clk = 64, encoding = 1, separator = 1, invert = 0;
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uint16_t arg1, arg2;
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size_t size = 96;
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arg1 = clk << 8 | encoding;
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arg2 = invert << 8 | separator;
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PrintAndLogEx(SUCCESS, "Simulating Visa2000 - CardId: %u", id);
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UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
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uint32_t blocks[3] = { BL0CK1, id, (visa_parity(id) << 4) | visa_chksum(id) };
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for (int i = 0; i < 3; ++i)
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num_to_bytebits(blocks[i], 32, c.d.asBytes + i * 32);
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clearCommandBuffer();
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SendCommand(&c);
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return 0;
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}
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static command_t CommandTable[] = {
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{"help", CmdHelp, 1, "This help"},
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{"demod", CmdVisa2kDemod, 1, "demodulate an VISA2000 tag from the GraphBuffer"},
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{"read", CmdVisa2kRead, 0, "attempt to read and extract tag data from the antenna"},
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{"clone", CmdVisa2kClone, 0, "clone Visa2000 to t55x7"},
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{"sim", CmdVisa2kSim, 0, "simulate Visa2000 tag"},
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{NULL, NULL, 0, NULL}
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};
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int CmdLFVisa2k(const char *Cmd) {
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clearCommandBuffer();
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CmdsParse(CommandTable, Cmd);
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return 0;
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}
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int CmdHelp(const char *Cmd) {
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CmdsHelp(CommandTable);
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return 0;
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}
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