+//-----------------------------------------------------------------------------
+//
+// 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
+//-----------------------------------------------------------------------------
+#include "cmdlfsecurakey.h"
+#include <string.h>
+#include <inttypes.h>
+#include <math.h>
+#include "proxmark3.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 - Noralsy: 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);
+ //setGrid_Clock(40);
+
+ //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[86];
+ memcpy(bits_no_spacer, DemodBuffer + 10, 86);
+
+ // remove marker bits (0's every 9th digit after preamble) (pType = 3 (always 0s))
+ size = removeParity(bits_no_spacer, 0, 9, 3, 86);
+ if ( size != 86-10 ) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error removeParity: %d", size);
+ return 0;
+ }
+
+ uint8_t bitLen = (uint8_t)bytebits_to_byte(DemodBuffer+2, 6);
+ uint32_t fc=0, lWiegand=0, rWiegand=0;
+ // get FC
+ // get left 1/2 wiegand & right 1/2 wiegand (for parity test and wiegand print)
+ lWiegand = bytebits_to_byte(DemodBuffer + 48 - bitLen, bitLen/2);
+ rWiegand = bytebits_to_byte(DemodBuffer + 48 - bitLen + bitLen/2, bitLen/2);
+ fc = bytebits_to_byte(DemodBuffer+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(DemodBuffer+8+23, 16);
+ // test parities
+ bool parity = evenparity32(lWiegand) && oddparity32(rWiegand);
+
+ PrintAndLog("Securakey Tag Found--BitLen: %u, Card ID: %u, FC: %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) {
+ CmdLFRead("s");
+ getSamples("8000",true);
+ 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;
+}
projects / proxmark3-svn / commitdiff