X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/300bb58ac13c6f52ad7070fe420305db80cbc30e..8b6abef506d69e3906c95a532e6ece5e71462e96:/client/cmdlfvisa2000.c?ds=sidebyside diff --git a/client/cmdlfvisa2000.c b/client/cmdlfvisa2000.c new file mode 100644 index 00000000..9ce35f98 --- /dev/null +++ b/client/cmdlfvisa2000.c @@ -0,0 +1,239 @@ +//----------------------------------------------------------------------------- +// +// This code is licensed to you under the terms of the GNU GPL, version 2 or, +// at your option, any later version. See the LICENSE.txt file for the text of +// the license. +//----------------------------------------------------------------------------- +// Low frequency visa 200 tag commands +// by iceman +//----------------------------------------------------------------------------- + +#include "cmdlfvisa2000.h" +#include "proxmark3.h" +#include "ui.h" +#include "util.h" +#include "graph.h" +#include "cmddata.h" // for ASKDemod_ext, g_debugMode, DemodBuffer ... +#include "cmdmain.h" // for clearCommandBuffer and WaitForResponseTimeout +#include "cmdlf.h" +#include "protocols.h" // for T55xx config register definitions +#include "lfdemod.h" // for Visa2kDemod_AM + +#define BL0CK1 0x56495332 + +static int CmdHelp(const char *Cmd); + +int usage_lf_visa2k_clone(void){ + PrintAndLog("clone a Visa2000 tag to a T55x7 tag."); + PrintAndLog("Usage: lf visa2k clone [h] "); + PrintAndLog("Options:"); + PrintAndLog(" h : This help"); + PrintAndLog(" : Visa2k card ID"); + PrintAndLog(" : specify write to Q5 (t5555 instead of t55x7)"); + PrintAndLog(""); + PrintAndLog("Sample: lf visa2k clone 112233"); + return 0; +} + +int usage_lf_visa2k_sim(void) { + PrintAndLog("Enables simulation of visa2k card with specified card number."); + PrintAndLog("Simulation runs until the button is pressed or another USB command is issued."); + PrintAndLog(""); + PrintAndLog("Usage: lf visa2k sim [h] "); + PrintAndLog("Options:"); + PrintAndLog(" h : This help"); + PrintAndLog(" : Visa2k card ID"); + PrintAndLog(""); + PrintAndLog("Sample: lf visa2k sim 112233"); + return 0; +} + +static uint8_t visa_chksum( uint32_t id ) { + uint8_t sum = 0; + for (uint8_t i = 0; i < 32; i += 4) + sum ^= (id >> i) & 0xF; + + return sum; +} + +static uint8_t visa_parity( uint32_t id) { + // 4bit parity LUT + uint8_t par_lut[] = { + 0,1,1,0 + ,1,0,0,1 + ,1,0,0,1 + ,0,1,1,0 + }; + uint8_t par = 0; + par |= par_lut[ (id >> 28) & 0xF ] << 7; + par |= par_lut[ (id >> 24) & 0xF ] << 6; + par |= par_lut[ (id >> 20) & 0xF ] << 5; + par |= par_lut[ (id >> 16) & 0xF ] << 4; + par |= par_lut[ (id >> 12) & 0xF ] << 3; + par |= par_lut[ (id >> 8) & 0xF ] << 2; + par |= par_lut[ (id >> 4) & 0xF ] << 1; + par |= par_lut[ (id & 0xF) ]; + return par; +} + + +/** +* +* 56495332 00096ebd 00000077 —> tag id 618173 +* aaaaaaaa iiiiiiii -----..c +* +* a = fixed value ascii 'VIS2' +* i = card id +* c = checksum (xor of card id) +* . = unknown +* +**/ +//see ASKDemod for what args are accepted +int CmdVisa2kDemod(const char *Cmd) { + + //sCmdAskEdgeDetect(""); + + //ASK / Manchester + bool st = true; + if (!ASKDemod_ext("64 0 0", false, false, 1, &st)) { + if (g_debugMode) PrintAndLog("DEBUG: Error - Visa2k: ASK/Manchester Demod failed"); + return 0; + } + size_t size = DemodBufferLen; + int ans = Visa2kDemod_AM(DemodBuffer, &size); + if (ans < 0){ + if (g_debugMode){ + if (ans == -1) + PrintAndLog("DEBUG: Error - Visa2k: too few bits found"); + else if (ans == -2) + PrintAndLog("DEBUG: Error - Visa2k: preamble not found"); + else if (ans == -3) + PrintAndLog("DEBUG: Error - Visa2k: Size not correct: %d", size); + else + PrintAndLog("DEBUG: Error - Visa2k: ans: %d", ans); + } + return 0; + } + setDemodBuf(DemodBuffer, 96, ans); + //setGrid_Clock(64); + + //got a good demod + uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32); + uint32_t raw2 = bytebits_to_byte(DemodBuffer+32, 32); + uint32_t raw3 = bytebits_to_byte(DemodBuffer+64, 32); + + // chksum + uint8_t calc = visa_chksum(raw2); + uint8_t chk = raw3 & 0xF; + + // test checksums + if ( chk != calc ) { + printf("DEBUG: error: Visa2000 checksum failed %x - %x\n", chk, calc); + return 0; + } + // parity + uint8_t calc_par = visa_parity(raw2); + uint8_t chk_par = (raw3 & 0xFF0) >> 4; + if ( calc_par != chk_par) { + printf("DEBUG: error: Visa2000 parity failed %x - %x\n", chk_par, calc_par); + return 0; + } + PrintAndLog("Visa2000 Tag Found: Card ID %u, Raw: %08X%08X%08X", raw2, raw1 ,raw2, raw3); + return 1; +} + +int CmdVisa2kRead(const char *Cmd) { + CmdLFRead("s"); + //64*96*2=12288 samples just in case we just missed the first preamble we can still catch 2 of them + getSamples("12500",true); + return CmdVisa2kDemod(Cmd); +} + +int CmdVisa2kClone(const char *Cmd) { + + uint64_t id = 0; + uint32_t blocks[4] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_64 | T55x7_ST_TERMINATOR | 3 << T55x7_MAXBLOCK_SHIFT, BL0CK1, 0}; + + char cmdp = param_getchar(Cmd, 0); + if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_clone(); + + id = param_get32ex(Cmd, 0, 0, 10); + + //Q5 + if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q') { + //t5555 (Q5) BITRATE = (RF-2)/2 (iceman) + blocks[0] = T5555_MODULATION_MANCHESTER | ((64-2)>>1) << T5555_BITRATE_SHIFT | T5555_ST_TERMINATOR | 3 << T5555_MAXBLOCK_SHIFT; + } + + blocks[2] = id; + blocks[3] = (visa_parity(id) << 4) | visa_chksum(id); + + PrintAndLog("Preparing to clone Visa2000 to T55x7 with CardId: %u", id); + PrintAndLog("Blk | Data "); + PrintAndLog("----+------------"); + for(int i = 0; i<4; ++i) + PrintAndLog(" %02d | 0x%08x", i , blocks[i]); + + UsbCommand resp; + UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}}; + + for (int i = 3; i >= 0; --i) { + c.arg[0] = blocks[i]; + c.arg[1] = i; + clearCommandBuffer(); + SendCommand(&c); + if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)){ + PrintAndLog("Error occurred, device did not respond during write operation."); + return -1; + } + } + return 0; +} + +int CmdVisa2kSim(const char *Cmd) { + + uint32_t id = 0; + char cmdp = param_getchar(Cmd, 0); + if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_sim(); + + id = param_get32ex(Cmd, 0, 0, 10); + + uint8_t clk = 64, encoding = 1, separator = 1, invert = 0; + uint16_t arg1, arg2; + size_t size = 96; + arg1 = clk << 8 | encoding; + arg2 = invert << 8 | separator; + + PrintAndLog("Simulating Visa2000 - CardId: %u", id); + + UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}}; + + uint32_t blocks[3] = { BL0CK1, id, (visa_parity(id) << 4) | visa_chksum(id) }; + + for(int i=0; i<3; ++i) + num_to_bytebits(blocks[i], 32, c.d.asBytes + i*32); + + clearCommandBuffer(); + SendCommand(&c); + return 0; +} + +static command_t CommandTable[] = { + {"help", CmdHelp, 1, "This help"}, + {"demod", CmdVisa2kDemod, 1, "Attempt to demod from GraphBuffer"}, + {"read", CmdVisa2kRead, 0, "Attempt to read and extract tag data"}, + {"clone", CmdVisa2kClone, 0, "clone Visa2000 tag"}, + {"sim", CmdVisa2kSim, 0, "simulate Visa2000 tag"}, + {NULL, NULL, 0, NULL} +}; + +int CmdLFVisa2k(const char *Cmd) { + clearCommandBuffer(); + CmdsParse(CommandTable, Cmd); + return 0; +} + +int CmdHelp(const char *Cmd) { + CmdsHelp(CommandTable); + return 0; +}