X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/488d309804afbf92e0e2ebba7e80612e84edca21..5bce72d5e3b5921ac7d8f08eeaa406fd2a53d4b0:/client/cmdlfnexwatch.c

diff --git a/client/cmdlfnexwatch.c b/client/cmdlfnexwatch.c
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+++ b/client/cmdlfnexwatch.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 Honeywell NexWatch tag commands
+// PSK1 RF/16, RF/2, 128 bits long
+//-----------------------------------------------------------------------------
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include "cmdlfnexwatch.h"
+#include "proxmark3.h"
+#include "ui.h"
+#include "util.h"
+#include "graph.h"
+#include "cmdparser.h"
+#include "cmddata.h"
+#include "cmdlf.h"
+#include "lfdemod.h"
+
+static int CmdHelp(const char *Cmd);
+
+int CmdPSKNexWatch(const char *Cmd)
+{
+	if (!PSKDemod("", false)) return 0;
+	uint8_t preamble[28] = {0,0,0,0,0,1,0,1,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+	size_t startIdx = 0, size = DemodBufferLen; 
+	bool invert = false;
+	if (!preambleSearch(DemodBuffer, preamble, sizeof(preamble), &size, &startIdx)){
+		// if didn't find preamble try again inverting
+		if (!PSKDemod("1", false)) return 0; 
+		size = DemodBufferLen;
+		if (!preambleSearch(DemodBuffer, preamble, sizeof(preamble), &size, &startIdx)) return 0;
+		invert = true;
+	}
+	if (size != 128) return 0;
+	setDemodBuf(DemodBuffer, size, startIdx+4);
+	startIdx = 8+32; //4 = extra i added, 8 = preamble, 32 = reserved bits (always 0)
+	//get ID
+	uint32_t ID = 0;
+	for (uint8_t wordIdx=0; wordIdx<4; wordIdx++){
+		for (uint8_t idx=0; idx<8; idx++){
+			ID = (ID << 1) | DemodBuffer[startIdx+wordIdx+(idx*4)];
+		}	
+	}
+	//parity check (TBD)
+
+	//checksum check (TBD)
+
+	//output
+	PrintAndLog("NexWatch ID: %d", ID);
+	if (invert){
+		PrintAndLog("Had to Invert - probably NexKey");
+		for (uint8_t idx=0; idx<size; idx++)
+			DemodBuffer[idx] ^= 1;
+	} 
+
+	CmdPrintDemodBuff("x");
+	return 1;
+}
+
+//by marshmellow
+//see ASKDemod for what args are accepted
+int CmdNexWatchRead(const char *Cmd) {
+	// read lf silently
+	CmdLFRead("s");
+	// get samples silently
+	getSamples("10000",false);
+	// demod and output viking ID	
+	return CmdPSKNexWatch(Cmd);
+}
+
+static command_t CommandTable[] = {
+	{"help",  CmdHelp,          1, "This help"},
+	{"demod", CmdPSKNexWatch,   1, "Demodulate a NexWatch tag (nexkey, quadrakey) from the GraphBuffer"},
+	{"read",  CmdNexWatchRead,  0, "Attempt to Read and Extract tag data from the antenna"},
+	{NULL, NULL, 0, NULL}
+};
+
+int CmdLFNexWatch(const char *Cmd) {
+	CmdsParse(CommandTable, Cmd);
+	return 0;
+}
+
+int CmdHelp(const char *Cmd) {
+	CmdsHelp(CommandTable);
+	return 0;
+}