proxmark3/client/cmdlfsecurakey.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

149 lines
5.2 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 Securakey tag commands
// ASK/Manchester, RF/40, 96 bits long (unknown cs)
//-----------------------------------------------------------------------------
#include "cmdlfsecurakey.h"
#include <string.h>
#include <inttypes.h>
#include <math.h>
#include "comms.h"
#include "ui.h"
#include "util.h"
#include "graph.h"
#include "cmdparser.h"
#include "cmddata.h"
#include "cmdmain.h"
#include "cmdlf.h"
#include "protocols.h" // for T55xx config register definitions
#include "lfdemod.h" // preamble test
#include "parity.h" // for wiegand parity test
static int CmdHelp(const char *Cmd);
// by marshmellow
// find Securakey preamble in already demoded data
int SecurakeyFind(uint8_t *dest, size_t *size) {
if (*size < 96) return -1; //make sure buffer has data
size_t startIdx = 0;
uint8_t preamble[] = {0,1,1,1,1,1,1,1,1,1,0,0,1};
if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
return -2; //preamble not found
if (*size != 96) return -3; //wrong demoded size
//return start position
return (int)startIdx;
}
//see ASKDemod for what args are accepted
int CmdSecurakeyDemod(const char *Cmd) {
//ASK / Manchester
bool st = false;
if (!ASKDemod_ext("40 0 0", false, false, 1, &st)) {
if (g_debugMode) PrintAndLog("DEBUG: Error - Securakey: ASK/Manchester Demod failed");
return 0;
}
if (st) return 0;
size_t size = DemodBufferLen;
int ans = SecurakeyFind(DemodBuffer, &size);
if (ans < 0) {
if (g_debugMode) {
if (ans == -1)
PrintAndLog("DEBUG: Error - Securakey: too few bits found");
else if (ans == -2)
PrintAndLog("DEBUG: Error - Securakey: preamble not found");
else if (ans == -3)
PrintAndLog("DEBUG: Error - Securakey: Size not correct: %d", size);
else
PrintAndLog("DEBUG: Error - Securakey: 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);
// 26 bit format
// preamble ??bitlen reserved EPx xxxxxxxy yyyyyyyy yyyyyyyOP CS? CS2?
// 0111111111 0 01011010 0 00000000 0 00000010 0 00110110 0 00111110 0 01100010 0 00001111 0 01100000 0 00000000 0 0000
// 32 bit format
// preamble ??bitlen reserved EPxxxxxxx xxxxxxxy yyyyyyyy yyyyyyyOP CS? CS2?
// 0111111111 0 01100000 0 00000000 0 10000100 0 11001010 0 01011011 0 01010110 0 00010110 0 11100000 0 00000000 0 0000
// x = FC?
// y = card #
// standard wiegand parities.
// unknown checksum 11 bits? at the end
uint8_t bits_no_spacer[85];
memcpy(bits_no_spacer, DemodBuffer + 11, 85);
// remove marker bits (0's every 9th digit after preamble) (pType = 3 (always 0s))
size = removeParity(bits_no_spacer, 0, 9, 3, 85);
if ( size != 85-9 ) {
if (g_debugMode) PrintAndLog("DEBUG: Error removeParity: %d", size);
return 0;
}
uint8_t bitLen = (uint8_t)bytebits_to_byte(bits_no_spacer+2, 6);
uint32_t fc=0, lWiegand=0, rWiegand=0;
if (bitLen > 40) { //securakey's max bitlen is 40 bits...
if (g_debugMode) PrintAndLog("DEBUG: Error bitLen too long: %u", bitLen);
return 0;
}
// get left 1/2 wiegand & right 1/2 wiegand (for parity test and wiegand print)
lWiegand = bytebits_to_byte(bits_no_spacer + 48 - bitLen, bitLen/2);
rWiegand = bytebits_to_byte(bits_no_spacer + 48 - bitLen + bitLen/2, bitLen/2);
// get FC
fc = bytebits_to_byte(bits_no_spacer+49-bitLen, bitLen-2-16);
// test bitLen
if (bitLen != 26 && bitLen != 32)
PrintAndLog("***unknown securakey bitLen - share with forum***");
uint32_t cardid = bytebits_to_byte(bits_no_spacer+8+23, 16);
// test parities - evenparity32 looks to add an even parity returns 0 if already even...
bool parity = !evenparity32(lWiegand) && !oddparity32(rWiegand);
PrintAndLog("Securakey Tag Found--BitLen: %u, Card ID: %u, FC: 0x%X, Raw: %08X%08X%08X", bitLen, cardid, fc, raw1 ,raw2, raw3);
if (bitLen <= 32)
PrintAndLog("Wiegand: %08X, Parity: %s", (lWiegand<<(bitLen/2)) | rWiegand, parity ? "Passed" : "Failed");
PrintAndLog("\nHow the FC translates to printed FC is unknown");
PrintAndLog("How the checksum is calculated is unknown");
PrintAndLog("Help the community identify this format further\n by sharing your tag on the pm3 forum or with forum members");
return 1;
}
int CmdSecurakeyRead(const char *Cmd) {
lf_read(true, 8000);
return CmdSecurakeyDemod(Cmd);
}
static command_t CommandTable[] = {
{"help", CmdHelp, 1, "This help"},
{"demod", CmdSecurakeyDemod,1, "Attempt to read and extract tag data from the GraphBuffer"},
{"read", CmdSecurakeyRead, 0, "Attempt to read and extract tag data from the antenna"},
{NULL, NULL, 0, NULL}
};
int CmdLFSecurakey(const char *Cmd) {
clearCommandBuffer();
CmdsParse(CommandTable, Cmd);
return 0;
}
int CmdHelp(const char *Cmd) {
CmdsHelp(CommandTable);
return 0;
}