proxmark3/client/cmdlfvisa2000.c
pwpiwi ad939de501
USB comms: part 4 towards @micolous PR #463
* make uart_communication(), storeCommand() and getCommand() static in comms.c
* move receiver thread creation and respective mutexes to comms.c
* add mutex and signal for tx buffer
* use comms.c for flasher as well
* remove comm functions from client/proxmark3.h
* this completes isolating all USB communication related functions in comms.c
* don't assume a port to be defined by a name. Change parameter in OpenProxmark() to void*
* comms.c: set sp and serial_port_name to NULL when offline
2018-06-03 14:25:20 +02:00

243 lines
6.9 KiB
C

//-----------------------------------------------------------------------------
//
// 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 2000 tag commands
// by iceman
// ASK/Manchester, RF/64, STT, 96 bits (complete)
//-----------------------------------------------------------------------------
#include "cmdlfvisa2000.h"
#include <stdio.h>
#include <string.h>
#include "comms.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 visa2000 clone [h] <card ID> <Q5>");
PrintAndLog("Options:");
PrintAndLog(" h : This help");
PrintAndLog(" <card ID> : Visa2000 card ID");
PrintAndLog(" <Q5> : specify write to Q5 (t5555 instead of t55x7)");
PrintAndLog("");
PrintAndLog("Sample: lf visa2000 clone 112233");
return 0;
}
int usage_lf_visa2k_sim(void) {
PrintAndLog("Enables simulation of visa2000 card with specified card number.");
PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
PrintAndLog("");
PrintAndLog("Usage: lf visa2000 sim [h] <card ID>");
PrintAndLog("Options:");
PrintAndLog(" h : This help");
PrintAndLog(" <card ID> : Visa2000 card ID");
PrintAndLog("");
PrintAndLog("Sample: lf visa2000 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 -----ppc
*
* a = fixed value ascii 'VIS2'
* i = card id
* p = even parity bit for each nibble in card id.
* c = checksum (xor of card id)
*
**/
//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 - Visa2000: 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 - Visa2000: too few bits found");
else if (ans == -2)
PrintAndLog("DEBUG: Error - Visa2000: preamble not found");
else if (ans == -3)
PrintAndLog("DEBUG: Error - Visa2000: Size not correct: %d", size);
else
PrintAndLog("DEBUG: Error - Visa2000: ans: %d", ans);
}
return 0;
}
setDemodBuf(DemodBuffer, 96, ans);
setClockGrid(g_DemodClock, g_DemodStartIdx + (ans*g_DemodClock));
//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) {
//64*96*2=12288 samples just in case we just missed the first preamble we can still catch 2 of them
lf_read(true, 12500);
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;
}