X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/199c74a47f3d44b815650d7ce79023cdc75ca550..c3caf0409cbc89f3cdda533c0860bfc813f8817b:/client/cmdlfsecurakey.c?ds=sidebyside

diff --git a/client/cmdlfsecurakey.c b/client/cmdlfsecurakey.c
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+//-----------------------------------------------------------------------------
+//
+// 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;
+}