+//-----------------------------------------------------------------------------
+//
+// 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 Stanley/PAC tag commands
+// NRZ, RF/32, 128 bits long (unknown cs)
+//-----------------------------------------------------------------------------
+#include "cmdlfpac.h"
+#include <string.h>
+#include <inttypes.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 "lfdemod.h" // preamble test
+
+static int CmdHelp(const char *Cmd);
+
+// by marshmellow
+// find PAC preamble in already demoded data
+int PacFind(uint8_t *dest, size_t *size) {
+ if (*size < 128) return -1; //make sure buffer has data
+ size_t startIdx = 0;
+ uint8_t preamble[] = {1,1,1,1,1,1,1,1,0,0,1,0,0,0,0,0,0,1,0};
+ if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
+ return -2; //preamble not found
+ if (*size != 128) return -3; //wrong demoded size
+ //return start position
+ return (int)startIdx;
+}
+
+//see NRZDemod for what args are accepted
+int CmdPacDemod(const char *Cmd) {
+
+ //NRZ
+ if (!NRZrawDemod(Cmd, false)) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error - PAC: NRZ Demod failed");
+ return 0;
+ }
+ size_t size = DemodBufferLen;
+ int ans = PacFind(DemodBuffer, &size);
+ if (ans < 0) {
+ if (g_debugMode) {
+ if (ans == -1)
+ PrintAndLog("DEBUG: Error - PAC: too few bits found");
+ else if (ans == -2)
+ PrintAndLog("DEBUG: Error - PAC: preamble not found");
+ else if (ans == -3)
+ PrintAndLog("DEBUG: Error - PAC: Size not correct: %d", size);
+ else
+ PrintAndLog("DEBUG: Error - PAC: ans: %d", ans);
+ }
+ return 0;
+ }
+ setDemodBuf(DemodBuffer, 128, ans);
+ setClockGrid(g_DemodClock, g_DemodStartIdx + (ans*g_DemodClock));
+
+ //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);
+ uint32_t raw4 = bytebits_to_byte(DemodBuffer+96, 32);
+
+ // preamble then appears to have marker bits of "10" CS?
+ // 11111111001000000 10 01001100 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 10001100 10 100000001
+ // unknown checksum 9 bits at the end
+
+ PrintAndLog("PAC/Stanley Tag Found -- Raw: %08X%08X%08X%08X", raw1 ,raw2, raw3, raw4);
+ PrintAndLog("\nHow the Raw ID is translated by the reader is unknown");
+ return 1;
+}
+
+int CmdPacRead(const char *Cmd) {
+ lf_read(true, 4096*2 + 20);
+ return CmdPacDemod(Cmd);
+}
+
+static command_t CommandTable[] = {
+ {"help", CmdHelp, 1, "This help"},
+ {"demod", CmdPacDemod,1, "Attempt to read and extract tag data from the GraphBuffer"},
+ {"read", CmdPacRead, 0, "Attempt to read and extract tag data from the antenna"},
+ {NULL, NULL, 0, NULL}
+};
+
+int CmdLFPac(const char *Cmd) {
+ clearCommandBuffer();
+ CmdsParse(CommandTable, Cmd);
+ return 0;
+}
+
+int CmdHelp(const char *Cmd) {
+ CmdsHelp(CommandTable);
+ return 0;
+}
projects / proxmark3-svn / commitdiff