mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-11-11 01:55:38 +08:00
218 lines
8.3 KiB
C
218 lines
8.3 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 Securakey tag commands
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// ASK/Manchester, RF/40, 96 bits long (unknown cs)
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//-----------------------------------------------------------------------------
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#include "cmdlfsecurakey.h"
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#include <string.h> // memcpy
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#include <ctype.h> // tolower
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#include "commonutil.h" // ARRAYLEN
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#include "cmdparser.h" // command_t
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#include "comms.h"
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#include "ui.h"
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#include "cmddata.h"
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#include "cmdlf.h"
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#include "lfdemod.h" // preamble test
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#include "parity.h" // for wiegand parity test
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#include "protocols.h" // t55xx defines
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#include "cmdlft55xx.h" // clone..
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static int CmdHelp(const char *Cmd);
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static int usage_lf_securakey_clone(void) {
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PrintAndLogEx(NORMAL, "clone a Securakey tag to a T55x7 tag.");
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PrintAndLogEx(NORMAL, "");
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PrintAndLogEx(NORMAL, "Usage: lf securakey clone [h] [b <raw hex>]");
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PrintAndLogEx(NORMAL, "Options:");
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PrintAndLogEx(NORMAL, " h : this help");
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PrintAndLogEx(NORMAL, " b <raw hex> : raw hex data. 12 bytes max");
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PrintAndLogEx(NORMAL, "");
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PrintAndLogEx(NORMAL, "Examples:");
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PrintAndLogEx(NORMAL, " lf securakey clone 7FCB400001ADEA5344300000");
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return PM3_SUCCESS;
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}
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//see ASKDemod for what args are accepted
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static int CmdSecurakeyDemod(const char *Cmd) {
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(void)Cmd; // Cmd is not used so far
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//ASK / Manchester
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bool st = false;
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if (ASKDemod_ext("40 0 0", false, false, 1, &st) != PM3_SUCCESS) {
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PrintAndLogEx(DEBUG, "DEBUG: Error - Securakey: ASK/Manchester Demod failed");
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return PM3_ESOFT;
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}
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if (st)
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return PM3_ESOFT;
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size_t size = DemodBufferLen;
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int ans = detectSecurakey(DemodBuffer, &size);
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if (ans < 0) {
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if (ans == -1)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Securakey: too few bits found");
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else if (ans == -2)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Securakey: preamble not found");
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else if (ans == -3)
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PrintAndLogEx(DEBUG, "DEBUG: Error - Securakey: Size not correct: %zu", size);
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else
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PrintAndLogEx(DEBUG, "DEBUG: Error - Securakey: ans: %d", ans);
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return PM3_ESOFT;
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}
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setDemodBuff(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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// 26 bit format
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// preamble ??bitlen reserved EPx xxxxxxxy yyyyyyyy yyyyyyyOP CS? CS2?
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// 0111111111 0 01011010 0 00000000 0 00000010 0 00110110 0 00111110 0 01100010 0 00001111 0 01100000 0 00000000 0 0000
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// 32 bit format
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// preamble ??bitlen reserved EPxxxxxxx xxxxxxxy yyyyyyyy yyyyyyyOP CS? CS2?
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// 0111111111 0 01100000 0 00000000 0 10000100 0 11001010 0 01011011 0 01010110 0 00010110 0 11100000 0 00000000 0 0000
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// x = FC?
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// y = card #
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// standard wiegand parities.
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// unknown checksum 11 bits? at the end
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uint8_t bits_no_spacer[85];
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memcpy(bits_no_spacer, DemodBuffer + 11, 85);
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// remove marker bits (0's every 9th digit after preamble) (pType = 3 (always 0s))
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size = removeParity(bits_no_spacer, 0, 9, 3, 85);
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if (size != 85 - 9) {
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PrintAndLogEx(DEBUG, "DEBUG: Error removeParity: %zu", size);
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return 0;
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}
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uint8_t bitLen = (uint8_t)bytebits_to_byte(bits_no_spacer + 2, 6);
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uint32_t fc = 0, lWiegand = 0, rWiegand = 0;
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if (bitLen > 40) { //securakey's max bitlen is 40 bits...
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PrintAndLogEx(DEBUG, "DEBUG: Error bitLen too long: %u", bitLen);
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return PM3_ESOFT;
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}
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// get left 1/2 wiegand & right 1/2 wiegand (for parity test and wiegand print)
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lWiegand = bytebits_to_byte(bits_no_spacer + 48 - bitLen, bitLen / 2);
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rWiegand = bytebits_to_byte(bits_no_spacer + 48 - bitLen + bitLen / 2, bitLen / 2);
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// get FC
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fc = bytebits_to_byte(bits_no_spacer + 49 - bitLen, bitLen - 2 - 16);
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// test bitLen
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if (bitLen != 26 && bitLen != 32)
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PrintAndLogEx(NORMAL, "***unknown securakey bitLen - share with forum***");
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uint32_t cardid = bytebits_to_byte(bits_no_spacer + 8 + 23, 16);
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// test parities - evenparity32 looks to add an even parity returns 0 if already even...
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bool parity = !evenparity32(lWiegand) && !oddparity32(rWiegand);
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PrintAndLogEx(SUCCESS, "Securakey Tag Found--BitLen: %u, Card ID: %u, FC: 0x%X, Raw: %08X%08X%08X", bitLen, cardid, fc, raw1, raw2, raw3);
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if (bitLen <= 32)
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PrintAndLogEx(SUCCESS, "Wiegand: %08X, Parity: %s", (lWiegand << (bitLen / 2)) | rWiegand, parity ? "Passed" : "Failed");
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PrintAndLogEx(INFO, "\nHow the FC translates to printed FC is unknown");
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PrintAndLogEx(INFO, "How the checksum is calculated is unknown");
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PrintAndLogEx(INFO, "Help the community identify this format further\n by sharing your tag on the pm3 forum or with forum members");
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return PM3_SUCCESS;
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}
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static int CmdSecurakeyRead(const char *Cmd) {
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lf_read(false, 8000);
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return CmdSecurakeyDemod(Cmd);
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}
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static int CmdSecurakeyClone(const char *Cmd) {
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uint32_t blocks[4];
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bool errors = false;
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uint8_t cmdp = 0;
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int datalen = 0;
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while (param_getchar(Cmd, cmdp) != 0x00 && !errors) {
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switch (tolower(param_getchar(Cmd, cmdp))) {
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case 'h':
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return usage_lf_securakey_clone();
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case 'b': {
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// skip first block, 3*4 = 12 bytes left
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uint8_t rawhex[12] = {0};
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int res = param_gethex_to_eol(Cmd, cmdp + 1, rawhex, sizeof(rawhex), &datalen);
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if (res != 0)
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errors = true;
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for (uint8_t i = 1; i < ARRAYLEN(blocks); i++) {
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blocks[i] = bytes_to_num(rawhex + ((i - 1) * 4), sizeof(uint32_t));
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}
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cmdp += 2;
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break;
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}
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default:
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PrintAndLogEx(WARNING, "Unknown parameter '%c'", param_getchar(Cmd, cmdp));
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errors = true;
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break;
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}
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}
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if (errors || cmdp == 0) return usage_lf_securakey_clone();
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//Securakey - compat mode, ASK/Man, data rate 40, 3 data blocks
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blocks[0] = T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_40 | 3 << T55x7_MAXBLOCK_SHIFT;
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PrintAndLogEx(INFO, "Preparing to clone Securakey to T55x7 with raw hex");
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print_blocks(blocks, ARRAYLEN(blocks));
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int res = clone_t55xx_tag(blocks, ARRAYLEN(blocks));
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PrintAndLogEx(SUCCESS, "Done");
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PrintAndLogEx(HINT, "Hint: try " _YELLOW_("`lf securakey read`") "to verify");
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return res;
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}
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static int CmdSecurakeySim(const char *Cmd) {
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PrintAndLogEx(INFO, " To be implemented, feel free to contribute!");
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return PM3_SUCCESS;
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}
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static command_t CommandTable[] = {
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{"help", CmdHelp, AlwaysAvailable, "This help"},
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{"demod", CmdSecurakeyDemod, AlwaysAvailable, "Demodulate an Securakey tag from the GraphBuffer"},
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{"read", CmdSecurakeyRead, IfPm3Lf, "Attempt to read and extract tag data from the antenna"},
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{"clone", CmdSecurakeyClone, IfPm3Lf, "clone Securakey tag to T55x7"},
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{"sim", CmdSecurakeySim, IfPm3Lf, "simulate Securakey tag"},
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{NULL, NULL, NULL, NULL}
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};
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static int CmdHelp(const char *Cmd) {
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(void)Cmd; // Cmd is not used so far
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CmdsHelp(CommandTable);
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return PM3_SUCCESS;
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}
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int CmdLFSecurakey(const char *Cmd) {
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clearCommandBuffer();
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return CmdsParse(CommandTable, Cmd);
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}
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// by marshmellow
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// find Securakey preamble in already demoded data
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int detectSecurakey(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, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1};
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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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int demodSecurakey(void) {
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return CmdSecurakeyDemod("");
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}
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