git.rot13.org Git - goodfet/blob - client/GoodFETGlitch.py

   1 #!/usr/bin/env python
   2 # GoodFET Client Library
   3 #
   4 # (C) 2009 Travis Goodspeed <travis at radiantmachines.com>
   5 #
   6 # This code is being rewritten and refactored.  You've been warned!
   7
   8 import sys, time, string, cStringIO, struct, glob, serial, os, random;
   9 import sqlite3;
  10
  11 from GoodFET import *;
  12
  13 script_timevcc="""
  14 plot "< sqlite3 glitch.db 'select time,vcc,glitchcount from glitches where count=0;'" \
  15 with dots \
  16 title "Scanned", \
  17 "< sqlite3 glitch.db 'select time,vcc,count from glitches where count>0;'" \
  18 with dots \
  19 title "Success", \
  20 "< sqlite3 glitch.db 'select time,vcc,count from glitches where count>0 and lock>0;'" \
  21 with dots \
  22 title "Exploited"
  23 """;
  24
  25 class GoodFETGlitch(GoodFET):
  26
  27     def __init__(self, *args, **kargs):
  28         print "Initializing GoodFET Glitcher."
  29         #Database connection w/ 30 second timeout.
  30         self.db=sqlite3.connect("glitch.db",30000);
  31         self.db.execute("create table if not exists glitches(time,vcc,gnd,trials,glitchcount,count,lock)");
  32         self.client=0;
  33     def setup(self,arch="avr"):
  34         self.client=getClient(arch);
  35     def graphx11(self):
  36         try:
  37             import Gnuplot, Gnuplot.PlotItems, Gnuplot.funcutils
  38         except ImportError:
  39             print "gnuplot-py is missing.  Can't graph."
  40             return;
  41         g = Gnuplot.Gnuplot(debug=1);
  42         g.clear();
  43
  44         g.title('Glitch Training Set');
  45         g.xlabel('Time (16MHz)');
  46         g.ylabel('VCC (DAC12)');
  47
  48         g('set datafile separator "|"');
  49
  50         g(script_timevcc);
  51         while 1==1:
  52             time.sleep(30);
  53             g('replot');
  54
  55
  56     def graph(self):
  57         #try:
  58         import Gnuplot, Gnuplot.PlotItems, Gnuplot.funcutils
  59         #except ImportError:
  60         #    print "py-gnuplot or py-numpy is missing.  Can't graph."
  61         #    return;
  62         g = Gnuplot.Gnuplot(debug=1);
  63
  64         g('\nset term png');
  65         g.title('Glitch Training Set');
  66         g.xlabel('Time (16MHz)');
  67         g.ylabel('VCC (DAC12)');
  68
  69         g('set datafile separator "|"');
  70         g('set term png');
  71         g('set output "timevcc.png"');
  72         g(script_timevcc);
  73
  74     def learn(self):
  75         #Learning phase
  76         trials=1;
  77         lock=0;  #1 locks, 0 unlocked
  78         vstart=0;
  79         vstop=1024;  #Could be as high as 0xFFF
  80         vstep=1;
  81         tstart=0;
  82         tstop=-1; #<0 defaults to full range
  83         tstep=0x1; #Must be 1
  84         self.scan(lock,trials,vstart,vstop,tstart,tstop);
  85
  86     def scan(self,lock,trials=1,vstart=0,vstop=0xfff,tstart=0,tstop=-1):
  87         client=self.client;
  88         self.lock=lock;
  89         client.serInit();
  90         if tstop<0:
  91             tstop=client.glitchstarttime();  #Really long; only use for initial investigation.
  92             print "-- Start takes %04i cycles." % tstop;
  93         client.start();
  94         client.erase();
  95
  96         self.secret=0x69;
  97
  98         while(client.eeprompeek(0)!=self.secret):
  99             print "-- Setting secret";
 100             client.start();
 101
 102             #Flash the secret to the first two bytes of CODE memory.
 103             client.erase();
 104             client.eeprompoke(0,self.secret);
 105             client.eeprompoke(1,self.secret);
 106             sys.stdout.flush()
 107
 108         #Lock chip to unlock it later.
 109         if lock>0:
 110             client.lock();
 111         voltages=range(vstart,vstop,1);
 112         times=range(tstart,tstop,1);
 113
 114         gnd=0;     #TODO, glitch GND.
 115         vcc=0xfff;
 116         random.shuffle(voltages);
 117         #random.shuffle(times);
 118
 119         for vcc in voltages:
 120             if not self.vccexplored(vcc):
 121                 print "Exploring vcc=%i" % vcc;
 122                 sys.stdout.flush();
 123                 for time in times:
 124                     self.scanat(trials,vcc,gnd,time)
 125                     sys.stdout.flush()
 126                 self.db.commit();
 127             else:
 128                 print "Voltage %i already explored." % vcc;
 129                 sys.stdout.flush();
 130     def vccexplored(self,vcc):
 131         c=self.db.cursor();
 132         c.execute("select vcc from glitches where vcc=? limit 1;",[vcc]);
 133         rows=c.fetchall();
 134         try:
 135             c.next();
 136             #This voltage has been explored, because no complete exception has been thrown.
 137             return True;
 138         except: #Voltage hasn't been explored
 139             return False;
 140
 141     def scanat(self,trials,vcc,gnd,time):
 142         client=self.client;
 143         db=self.db;
 144         client.glitchRate(time);
 145         client.glitchVoltages(gnd, vcc);  #drop voltage target
 146         gcount=0;
 147         scount=0;
 148         #print "-- (%5i,%5i)" % (time,vcc);
 149         #sys.stdout.flush();
 150         for i in range(0,trials):
 151             client.glitchstart();
 152
 153             #Try to read *0, which is secret if read works.
 154             a=client.eeprompeek(0x0);
 155             if self.lock>0: #locked
 156                 if(a!=0 and a!=0xFF and a!=self.secret):
 157                     gcount+=1;
 158                 if(a==self.secret):
 159                     print "-- %04x: %02x HELL YEAH! " % (time, a);
 160                     scount+=1;
 161             else: #unlocked
 162                 if(a!=self.secret):
 163                     gcount+=1;
 164                 if(a==self.secret):
 165                     scount+=1;
 166         #print "values (%i,%i,%i,%i,%i);" % (
 167         #    time,vcc,gnd,gcount,scount);
 168         self.db.execute("insert into glitches(time,vcc,gnd,trials,glitchcount,count,lock)"
 169                    "values (%i,%i,%i,%i,%i,%i,%i);" % (
 170                 time,vcc,gnd,trials,gcount,scount,self.lock));