+//-----------------------------------------------------------------------------
+//
+// 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 G Prox II tag commands
+//-----------------------------------------------------------------------------
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include "cmdlfgproxii.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"
+static int CmdHelp(const char *Cmd);
+
+//by marshmellow
+//attempts to demodulate and identify a G_Prox_II verex/chubb card
+//WARNING: if it fails during some points it will destroy the DemodBuffer data
+// but will leave the GraphBuffer intact.
+//if successful it will push askraw data back to demod buffer ready for emulation
+int CmdG_Prox_II_Demod(const char *Cmd)
+{
+ if (!ASKbiphaseDemod(Cmd, false)){
+ if (g_debugMode) PrintAndLog("Error gProxII: ASKbiphaseDemod failed 1st try");
+ return 0;
+ }
+ size_t size = DemodBufferLen;
+ //call lfdemod.c demod for gProxII
+ int ans = gProxII_Demod(DemodBuffer, &size);
+ if (ans < 0){
+ if (g_debugMode) PrintAndLog("Error gProxII_Demod");
+ return 0;
+ }
+ //got a good demod of 96 bits
+ uint8_t ByteStream[8] = {0x00};
+ uint8_t xorKey=0;
+ size_t startIdx = ans + 6; //start after 6 bit preamble
+
+ uint8_t bits_no_spacer[90];
+ //so as to not mess with raw DemodBuffer copy to a new sample array
+ memcpy(bits_no_spacer, DemodBuffer + startIdx, 90);
+ // remove the 18 (90/5=18) parity bits (down to 72 bits (96-6-18=72))
+ size_t bitLen = removeParity(bits_no_spacer, 0, 5, 3, 90); //source, startloc, paritylen, ptype, length_to_run
+ if (bitLen != 72) {
+ if (g_debugMode) PrintAndLog("Error gProxII: spacer removal did not produce 72 bits: %u, start: %u", bitLen, startIdx);
+ return 0;
+ }
+ // get key and then get all 8 bytes of payload decoded
+ xorKey = (uint8_t)bytebits_to_byteLSBF(bits_no_spacer, 8);
+ for (size_t idx = 0; idx < 8; idx++) {
+ ByteStream[idx] = ((uint8_t)bytebits_to_byteLSBF(bits_no_spacer+8 + (idx*8),8)) ^ xorKey;
+ if (g_debugMode) PrintAndLog("byte %u after xor: %02x", (unsigned int)idx, ByteStream[idx]);
+ }
+ //now ByteStream contains 8 Bytes (64 bits) of decrypted raw tag data
+ //
+ uint8_t fmtLen = ByteStream[0]>>2;
+ uint32_t FC = 0;
+ uint32_t Card = 0;
+ //get raw 96 bits to print
+ uint32_t raw1 = bytebits_to_byte(DemodBuffer+ans,32);
+ uint32_t raw2 = bytebits_to_byte(DemodBuffer+ans+32, 32);
+ uint32_t raw3 = bytebits_to_byte(DemodBuffer+ans+64, 32);
+
+ if (fmtLen==36){
+ FC = ((ByteStream[3] & 0x7F)<<7) | (ByteStream[4]>>1);
+ Card = ((ByteStream[4]&1)<<19) | (ByteStream[5]<<11) | (ByteStream[6]<<3) | (ByteStream[7]>>5);
+ PrintAndLog("G-Prox-II Found: FmtLen %d, FC %u, Card %u", (int)fmtLen, FC, Card);
+ } else if(fmtLen==26){
+ FC = ((ByteStream[3] & 0x7F)<<1) | (ByteStream[4]>>7);
+ Card = ((ByteStream[4]&0x7F)<<9) | (ByteStream[5]<<1) | (ByteStream[6]>>7);
+ PrintAndLog("G-Prox-II Found: FmtLen %d, FC %u, Card %u", (int)fmtLen, FC, Card);
+ } else {
+ PrintAndLog("Unknown G-Prox-II Fmt Found: FmtLen %d",(int)fmtLen);
+ PrintAndLog("Decoded Raw: %s", sprint_hex(ByteStream, 8));
+ }
+ PrintAndLog("Raw: %08x%08x%08x", raw1,raw2,raw3);
+ setDemodBuf(DemodBuffer+ans, 96, 0);
+ return 1;
+}
+//by marshmellow
+//see ASKDemod for what args are accepted
+int CmdG_Prox_II_Read(const char *Cmd) {
+ // read lf silently
+ CmdLFRead("s");
+ // get samples silently
+ getSamples("10000",false);
+ // demod and output viking ID
+ return CmdG_Prox_II_Demod(Cmd);
+}
+
+static command_t CommandTable[] = {
+ {"help", CmdHelp, 1, "This help"},
+ {"demod", CmdG_Prox_II_Demod, 1, "Demodulate a G Prox II tag from the GraphBuffer"},
+ {"read", CmdG_Prox_II_Read, 0, "Attempt to read and Extract tag data from the antenna"},
+ {NULL, NULL, 0, NULL}
+};
+
+int CmdLF_G_Prox_II(const char *Cmd) {
+ CmdsParse(CommandTable, Cmd);
+ return 0;
+}
+
+int CmdHelp(const char *Cmd) {
+ CmdsHelp(CommandTable);
+ return 0;
+}
projects / proxmark3-svn / commitdiff