mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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237 lines
6.5 KiB
C
237 lines
6.5 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// Graph utilities
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//-----------------------------------------------------------------------------
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#include "graph.h"
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int GraphBuffer[MAX_GRAPH_TRACE_LEN];
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int GraphTraceLen;
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int s_Buff[MAX_GRAPH_TRACE_LEN];
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/* write a manchester bit to the graph */
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void AppendGraph(int redraw, int clock, int bit) {
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int i;
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//set first half the clock bit (all 1's or 0's for a 0 or 1 bit)
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for (i = 0; i < (int)(clock / 2); ++i)
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GraphBuffer[GraphTraceLen++] = bit ;
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//set second half of the clock bit (all 0's or 1's for a 0 or 1 bit)
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for (i = (int)(clock / 2); i < clock; ++i)
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GraphBuffer[GraphTraceLen++] = bit ^ 1;
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if (redraw)
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RepaintGraphWindow();
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}
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// clear out our graph window
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int ClearGraph(int redraw) {
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int gtl = GraphTraceLen;
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memset(GraphBuffer, 0x00, GraphTraceLen);
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GraphTraceLen = 0;
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if (redraw)
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RepaintGraphWindow();
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return gtl;
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}
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// option '1' to save GraphBuffer any other to restore
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void save_restoreGB(uint8_t saveOpt) {
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static int SavedGB[MAX_GRAPH_TRACE_LEN];
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static int SavedGBlen = 0;
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static bool GB_Saved = false;
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static int SavedGridOffsetAdj = 0;
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if (saveOpt == GRAPH_SAVE) { //save
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memcpy(SavedGB, GraphBuffer, sizeof(GraphBuffer));
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SavedGBlen = GraphTraceLen;
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GB_Saved = true;
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SavedGridOffsetAdj = GridOffset;
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} else if (GB_Saved){ //restore
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memcpy(GraphBuffer, SavedGB, sizeof(GraphBuffer));
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GraphTraceLen = SavedGBlen;
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GridOffset = SavedGridOffsetAdj;
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RepaintGraphWindow();
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}
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return;
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}
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// DETECT CLOCK NOW IN LFDEMOD.C
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void setGraphBuf(uint8_t *buf, size_t size) {
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if ( buf == NULL ) return;
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ClearGraph(0);
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if ( size > MAX_GRAPH_TRACE_LEN )
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size = MAX_GRAPH_TRACE_LEN;
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for (uint16_t i = 0; i < size; ++i)
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GraphBuffer[i] = buf[i] - 128;
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GraphTraceLen = size;
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RepaintGraphWindow();
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return;
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}
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size_t getFromGraphBuf(uint8_t *buf) {
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if (buf == NULL ) return 0;
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uint32_t i;
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for (i=0; i < GraphTraceLen; ++i){
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//trim
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if (GraphBuffer[i] > 127) GraphBuffer[i] = 127;
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if (GraphBuffer[i] < -127) GraphBuffer[i] = -127;
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buf[i] = (uint8_t)(GraphBuffer[i] + 128);
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}
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return i;
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}
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// A simple test to see if there is any data inside Graphbuffer.
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bool HasGraphData(){
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if ( GraphTraceLen <= 0) {
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PrintAndLog("No data available, try reading something first");
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return false;
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}
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return true;
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}
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// Get or auto-detect ask clock rate
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int GetAskClock(const char *str, bool printAns) {
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int clock = param_get32ex(str, 0, 0, 10);
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if (clock > 0)
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return clock;
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// Auto-detect clock
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uint8_t grph[MAX_GRAPH_TRACE_LEN] = {0};
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size_t size = getFromGraphBuf(grph);
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if (size == 0) {
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if (g_debugMode)
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PrintAndLog("Failed to copy from graphbuffer");
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return -1;
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}
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//, size_t *ststart, size_t *stend
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size_t ststart = 0, stend = 0;
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bool st = DetectST(grph, &size, &clock, &ststart, &stend);
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int start = stend;
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if (st == false) {
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start = DetectASKClock(grph, size, &clock, 20);
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}
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setClockGrid(clock, start);
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// Only print this message if we're not looping something
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if (printAns || g_debugMode)
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PrintAndLog("Auto-detected clock rate: %d, Best Starting Position: %d", clock, start);
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return clock;
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}
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uint8_t GetPskCarrier(const char *str, bool printAns) {
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uint8_t carrier = 0;
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uint8_t grph[MAX_GRAPH_TRACE_LEN] = {0};
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size_t size = getFromGraphBuf(grph);
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if ( size == 0 ) {
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if (g_debugMode)
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PrintAndLog("Failed to copy from graphbuffer");
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return 0;
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}
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uint16_t fc = countFC(grph, size, 0);
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carrier = fc & 0xFF;
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if (carrier != 2 && carrier != 4 && carrier != 8) return 0;
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if (( fc >> 8) == 10 && carrier == 8) return 0;
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// Only print this message if we're not looping something
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if (printAns)
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PrintAndLog("Auto-detected PSK carrier rate: %d", carrier);
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return carrier;
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}
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int GetPskClock(const char* str, bool printAns) {
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int clock = param_get32ex(str, 0, 0, 10);
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if (clock != 0)
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return clock;
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// Auto-detect clock
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uint8_t grph[MAX_GRAPH_TRACE_LEN] = {0};
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size_t size = getFromGraphBuf(grph);
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if ( size == 0 ) {
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if (g_debugMode) PrintAndLog("Failed to copy from graphbuffer");
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return -1;
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}
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size_t firstPhaseShiftLoc = 0;
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uint8_t curPhase = 0, fc = 0;
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clock = DetectPSKClock(grph, size, 0, &firstPhaseShiftLoc, &curPhase, &fc);
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setClockGrid(clock, firstPhaseShiftLoc);
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// Only print this message if we're not looping something
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if (printAns)
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PrintAndLog("Auto-detected clock rate: %d", clock);
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return clock;
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}
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int GetNrzClock(const char* str, bool printAns) {
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int clock = param_get32ex(str, 0, 0, 10);
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if (clock != 0)
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return clock;
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// Auto-detect clock
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uint8_t grph[MAX_GRAPH_TRACE_LEN] = {0};
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size_t size = getFromGraphBuf(grph);
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if ( size == 0 ) {
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if (g_debugMode)
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PrintAndLog("Failed to copy from graphbuffer");
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return -1;
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}
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size_t clkStartIdx = 0;
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clock = DetectNRZClock(grph, size, 0, &clkStartIdx);
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setClockGrid(clock, clkStartIdx);
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// Only print this message if we're not looping something
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if (printAns)
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PrintAndLog("Auto-detected clock rate: %d", clock);
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return clock;
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}
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//by marshmellow
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//attempt to detect the field clock and bit clock for FSK
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int GetFskClock(const char* str, bool printAns) {
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int clock = param_get32ex(str, 0, 0, 10);
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if (clock != 0)
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return clock;
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uint8_t fc1 = 0, fc2 = 0, rf1 = 0;
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int firstClockEdge = 0;
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int ans = fskClocks(&fc1, &fc2, &rf1, &firstClockEdge);
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if (ans == 0)
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return 0;
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if ((fc1==10 && fc2==8) || (fc1==8 && fc2==5)){
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if (printAns) PrintAndLog("Detected Field Clocks: FC/%d, FC/%d - Bit Clock: RF/%d", fc1, fc2, rf1);
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setClockGrid(rf1, firstClockEdge);
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return rf1;
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}
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if (g_debugMode) {
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PrintAndLog("DEBUG: unknown fsk field clock detected");
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PrintAndLog("Detected Field Clocks: FC/%d, FC/%d - Bit Clock: RF/%d", fc1, fc2, rf1);
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}
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return 0;
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}
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int fskClocks(uint8_t *fc1, uint8_t *fc2, uint8_t *rf1, int *firstClockEdge) {
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uint8_t bits[MAX_GRAPH_TRACE_LEN] = {0};
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size_t size = getFromGraphBuf(bits);
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if (size == 0)
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return 0;
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uint16_t ans = countFC(bits, size, 1);
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if (ans == 0) {
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if (g_debugMode) PrintAndLog("DEBUG: No data found");
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return 0;
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}
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*fc1 = (ans >> 8) & 0xFF;
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*fc2 = ans & 0xFF;
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//int firstClockEdge = 0;
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*rf1 = detectFSKClk(bits, size, *fc1, *fc2, firstClockEdge);
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if (*rf1 == 0) {
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if (g_debugMode) PrintAndLog("DEBUG: Clock detect error");
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return 0;
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}
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return 1;
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}
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