mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-09-21 07:46:12 +08:00
240 lines
7.2 KiB
C
240 lines
7.2 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 Farpoint / Pyramid tag commands
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//-----------------------------------------------------------------------------
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#include <string.h>
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#include <inttypes.h>
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#include "cmdlfguard.h"
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static int CmdHelp(const char *Cmd);
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int usage_lf_guard_clone(void){
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PrintAndLog("clone a Guardall tag to a T55x7 tag.");
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PrintAndLog("The facility-code is 8-bit and the card number is 16-bit. Larger values are truncated. ");
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PrintAndLog("Currently work only on 26bit");
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PrintAndLog("");
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PrintAndLog("Usage: lf guard clone <Facility-Code> <Card-Number>");
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PrintAndLog("Options :");
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PrintAndLog(" <Facility-Code> : 8-bit value facility code");
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PrintAndLog(" <Card Number> : 16-bit value card number");
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PrintAndLog("");
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PrintAndLog("Sample : lf guard clone 123 11223");
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return 0;
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}
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int usage_lf_guard_sim(void) {
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PrintAndLog("Enables simulation of Guardall card with specified card number.");
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PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
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PrintAndLog("The facility-code is 8-bit and the card number is 16-bit. Larger values are truncated.");
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PrintAndLog("Currently work only on 26bit");
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PrintAndLog("");
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PrintAndLog("Usage: lf guard sim <Card-Number>");
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PrintAndLog("Options :");
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PrintAndLog(" <Facility-Code> : 8-bit value facility code");
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PrintAndLog(" <Card Number> : 16-bit value card number");
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PrintAndLog("");
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PrintAndLog("Sample : lf guard sim 123 11223");
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return 0;
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}
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// Works for 26bits.
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int GetGuardBits(uint32_t fc, uint32_t cn, uint8_t *guardBits) {
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// Intializes random number generator
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time_t t;
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srand((unsigned) time(&t));
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//uint8_t xorKey = rand() % 0xFF;
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uint8_t xorKey = 0x66;
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uint8_t i;
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uint8_t pre[96];
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memset(pre, 0x00, sizeof(pre));
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// Get 26 wiegand from FacilityCode, CardNumber
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uint8_t wiegand[24];
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memset(wiegand, 0x00, sizeof(wiegand));
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num_to_bytebits(fc, 8, wiegand);
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num_to_bytebits(cn, 16, wiegand+8);
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// add wiegand parity bits (dest, source, len)
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wiegand_add_parity(pre, wiegand, 24);
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// lets start. 12bytes of data to be produced.
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uint8_t rawbytes[12];
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memset(rawbytes, 0x00, sizeof(rawbytes));
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// xor key
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rawbytes[0] = xorKey;
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// add format length (decimal)
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// len | hex | bin
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// 26 | 1A | 0001 1010
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rawbytes[1] = (26 << 2);
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// 36 | 24 | 0010 0100
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//rawbytes[1] = (36 << 2);
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// 40 | 28 | 0010 1000
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//rawbytes[1] = (40 << 2);
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// 2bit checksum, unknown today,
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// these two bits are the last ones of rawbyte[1], hence the LSHIFT above.
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rawbytes[2] = 1;
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rawbytes[3] = 0;
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// add wiegand to rawbytes
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for (i = 0; i < 4; ++i)
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rawbytes[i+4] = bytebits_to_byte( pre + (i*8), 8);
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if (g_debugMode) printf(" WIE | %s\n", sprint_hex(rawbytes, sizeof(rawbytes)));
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// XOR (only works on wiegand stuff)
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for (i = 1; i < 12; ++i)
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rawbytes[i] ^= xorKey ;
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if (g_debugMode) printf(" XOR | %s \n", sprint_hex(rawbytes, sizeof(rawbytes)));
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// convert rawbytes to bits in pre
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for (i = 0; i < 12; ++i)
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num_to_bytebitsLSBF( rawbytes[i], 8, pre + (i*8));
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if (g_debugMode) printf("\n Raw | %s \n", sprint_hex(rawbytes, sizeof(rawbytes)));
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if (g_debugMode) printf(" Raw | %s\n", sprint_bin(pre, 64) );
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// add spacer bit 0 every 4 bits, starting with index 0,
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// 12 bytes, 24 nibbles. 24+1 extra bites. 3bytes. ie 9bytes | 1byte xorkey, 8bytes rawdata (64bits, should be enough for a 40bit wiegand)
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addParity(pre, guardBits+6, 64, 5, 3);
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// preamble
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guardBits[0] = 1;
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guardBits[1] = 1;
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guardBits[2] = 1;
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guardBits[3] = 1;
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guardBits[4] = 1;
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guardBits[5] = 0;
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if (g_debugMode) printf(" FIN | %s\n", sprint_bin(guardBits, 96) );
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return 1;
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}
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int CmdGuardRead(const char *Cmd) {
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CmdLFRead("s");
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getSamples("30000",false);
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return CmdG_Prox_II_Demod("");
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}
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int CmdGuardClone(const char *Cmd) {
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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_guard_clone();
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uint32_t facilitycode=0, cardnumber=0, fc = 0, cn = 0;
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uint8_t i;
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uint8_t bs[96];
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memset(bs, 0x00, sizeof(bs));
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//GuardProxII - compat mode, ASK/Biphase, data rate 64, 3 data blocks
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uint32_t blocks[5] = {T55x7_MODULATION_BIPHASE | T55x7_BITRATE_RF_64 | 3<<T55x7_MAXBLOCK_SHIFT, 0, 0, 0, 0};
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// if (param_getchar(Cmd, 3) == 'Q' || param_getchar(Cmd, 3) == 'q')
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// blocks[0] = T5555_MODULATION_FSK2 | 50<<T5555_BITRATE_SHIFT | 4<<T5555_MAXBLOCK_SHIFT;
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if (sscanf(Cmd, "%u %u", &fc, &cn ) != 2) return usage_lf_guard_clone();
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facilitycode = (fc & 0x000000FF);
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cardnumber = (cn & 0x0000FFFF);
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if ( !GetGuardBits(facilitycode, cardnumber, bs)) {
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PrintAndLog("Error with tag bitstream generation.");
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return 1;
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}
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blocks[1] = bytebits_to_byte(bs,32);
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blocks[2] = bytebits_to_byte(bs+32,32);
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blocks[3] = bytebits_to_byte(bs+64,32);
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PrintAndLog("Preparing to clone Guardall to T55x7 with Facility Code: %u, Card Number: %u", facilitycode, cardnumber);
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PrintAndLog("Blk | Data ");
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PrintAndLog("----+------------");
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for ( i = 0; i<4; ++i )
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PrintAndLog(" %02d | %08x", i, blocks[i]);
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UsbCommand resp;
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UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
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for ( 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, 1000)){
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PrintAndLog("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 CmdGuardSim(const char *Cmd) {
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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_guard_sim();
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uint32_t facilitycode = 0, cardnumber = 0, fc = 0, cn = 0;
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uint8_t clock = 64, encoding = 2, separator = 0, invert = 0;
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uint8_t bs[96];
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memset(bs, 0x00, sizeof(bs));
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if (sscanf(Cmd, "%u %u", &fc, &cn ) != 2) return usage_lf_guard_sim();
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facilitycode = (fc & 0x000000FF);
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cardnumber = (cn & 0x0000FFFF);
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if ( !GetGuardBits(facilitycode, cardnumber, bs)) {
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PrintAndLog("Error with tag bitstream generation.");
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return 1;
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}
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PrintAndLog("Simulating Guardall - Facility Code: %u, CardNumber: %u", facilitycode, cardnumber );
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// Guard uses: clk: 64, invert: 0, encoding: 2 (ASK Biphase)
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uint64_t arg1, arg2;
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arg1 = (clock << 8) | encoding;
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arg2 = (invert << 8) | separator;
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uint8_t rawbytes[12];
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size_t size = sizeof(rawbytes);
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for (uint8_t i=0; i < size; ++i){
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rawbytes[i] = bytebits_to_byte( bs + (i*8), 8);
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}
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UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
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memcpy(c.d.asBytes, rawbytes, size );
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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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{"read", CmdGuardRead, 0, "Attempt to read and extract tag data"},
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{"clone", CmdGuardClone, 0, "<Facility-Code> <Card Number> clone Guardall tag"},
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{"sim", CmdGuardSim, 0, "<Facility-Code> <Card Number> simulate Guardall tag"},
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{NULL, NULL, 0, NULL}
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};
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int CmdLFGuard(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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