2 # GoodFET Client Library
4 # (C) 2009 Travis Goodspeed <travis at radiantmachines.com>
6 # This code is being rewritten and refactored. You've been warned!
8 import sys, time, string, cStringIO, struct, glob, serial, os, random;
11 from GoodFET import *;
14 # After four million points, this kills 32-bit gnuplot.
15 # Dumping to a bitmap might be preferable.
17 plot "< sqlite3 glitch.db 'select time,vcc,glitchcount from glitches where count=0;'" \
20 "< sqlite3 glitch.db 'select time,vcc,count from glitches where count>0;'" \
23 "< sqlite3 glitch.db 'select time,vcc,count from glitches where count>0 and lock>0;'" \
27 script_timevccrange="""
28 plot "< sqlite3 glitch.db 'select time,vcc,glitchcount from glitches where count=0;'" \
31 "< sqlite3 glitch.db 'select time,vcc,count from glitches where count>0;'" \
34 "< sqlite3 glitch.db 'select time,max(vcc),count from glitches where count=0 group by time ;'" with lines title "Max", \
35 "< sqlite3 glitch.db 'select time,min(vcc),count from glitches where count>0 group by time ;'" with lines title "Min"
38 class GoodFETGlitch(GoodFET):
40 def __init__(self, *args, **kargs):
41 print "Initializing GoodFET Glitcher."
42 #Database connection w/ 30 second timeout.
43 self.db=sqlite3.connect("glitch.db",30000);
46 self.db.execute("create table if not exists glitches(time,vcc,gnd,trials,glitchcount,count,lock);");
47 self.db.execute("create index if not exists glitchvcc on glitches(vcc);");
48 self.db.execute("create index if not exists glitchtime on glitches(time);");
50 #Exploitation record, to be built from the training table.
51 self.db.execute("create table if not exists exploits(time,vcc,gnd,trials,count);");
52 self.db.execute("create index if not exists exploitvcc on exploits(vcc);");
53 self.db.execute("create index if not exists exploittime on exploits(time);");
56 def setup(self,arch="avr"):
57 self.client=getClient(arch);
58 self.client.serInit();
60 def glitchvoltages(self,time):
61 """Returns list of voltages to train at."""
64 # (select min(vcc) from glitches where time=? and count=1),
65 # (select max(vcc) from glitches where time=? and count=0);""",
67 c.execute("select min,max from glitchrange where time=? and max-min>0;",[time]);
72 if(min==None or max==None): return [];
75 return range(min,max,1);
76 #If we get here, there are no points. Return empty set.
79 """This builds tables for glitching voltage ranges from the training set."""
80 print "Precomputing glitching ranges. This might take a long while.";
83 self.db.execute("drop table if exists glitchrange;");
84 self.db.execute("create table glitchrange(time integer primary key asc,max,min);");
85 self.db.execute("insert into glitchrange(time,max,min) select distinct time, 0, 0 from glitches;");
89 self.db.execute("update glitchrange set max=(select max(vcc) from glitches where glitches.time=glitchrange.time and count=0);");
93 self.db.execute("update glitchrange set min=(select min(vcc) from glitches where glitches.time=glitchrange.time and count>0);");
95 print "Ranges calculated.";
98 import Gnuplot, Gnuplot.PlotItems, Gnuplot.funcutils
100 print "gnuplot-py is missing. Can't graph."
102 g = Gnuplot.Gnuplot(debug=1);
105 g.title('Glitch Training Set');
106 g.xlabel('Time (16MHz)');
107 g.ylabel('VCC (DAC12)');
109 g('set datafile separator "|"');
118 import Gnuplot, Gnuplot.PlotItems, Gnuplot.funcutils
119 g = Gnuplot.Gnuplot(debug=1);
122 g.title('Glitch Training Set');
123 g.xlabel('Time (16MHz)');
124 g.ylabel('VCC (DAC12)');
126 g('set datafile separator "|"');
128 g('set output "timevcc.png"');
130 def explore(self,tstart=0,tstop=-1, trials=5):
131 """Exploration phase. Uses thresholds to find exploitable points."""
133 self.scansetup(1); #Lock the chip, place key in eeprom.
135 tstop=self.client.glitchstarttime();
136 times=range(tstart,tstop);
137 random.shuffle(times);
140 total=1.0*len(times);
143 c.execute("select time,min,max from glitchrange where max-min>0;");
149 voltages=range(min,max,1);
151 print "%02.02f Exploring %04i points in t=%04i." % (count/total,len(voltages),t);
154 self.scanat(1,trials,vcc,gnd,t);
156 """Learning phase. Finds thresholds at which the chip screws up."""
158 lock=0; #1 locks, 0 unlocked
160 vstop=1024; #Could be as high as 0xFFF, but upper range is useless
163 tstop=self.client.glitchstarttime();
164 tstep=0x1; #Must be 1
165 self.scan(lock,trials,range(vstart,vstop),range(tstart,tstop));
166 print "Learning phase complete, beginning to expore.";
169 def scansetup(self,lock):
176 while(client.eeprompeek(0)!=self.secret):
177 print "-- Setting secret";
180 #Flash the secret to the first two bytes of CODE memory.
182 client.eeprompoke(0,self.secret);
183 client.eeprompoke(1,self.secret);
186 #Lock chip to unlock it later.
191 def scan(self,lock,trials,voltages,times):
192 """Scan many voltages and times."""
194 self.scansetup(lock);
196 random.shuffle(voltages);
197 #random.shuffle(times);
200 if lock<0 and not self.vccexplored(vcc):
201 print "Exploring vcc=%i" % vcc;
204 self.scanat(lock,trials,vcc,gnd,time)
208 print "Voltage %i already explored." % vcc;
212 def vccexplored(self,vcc):
214 c.execute("select vcc from glitches where vcc=? limit 1;",[vcc]);
219 def scanat(self,lock,trials,vcc,gnd,time):
222 client.glitchRate(time);
223 client.glitchVoltages(gnd, vcc); #drop voltage target
226 #print "-- (%5i,%5i)" % (time,vcc);
228 for i in range(0,trials):
229 client.glitchstart();
231 #Try to read *0, which is secret if read works.
232 a=client.eeprompeek(0x0);
234 if(a!=0 and a!=0xFF and a!=self.secret):
237 print "-- %06i: %02x HELL YEAH! " % (time, a);
244 #print "values (%i,%i,%i,%i,%i);" % (
245 # time,vcc,gnd,gcount,scount);
247 self.db.execute("insert into glitches(time,vcc,gnd,trials,glitchcount,count,lock)"
248 "values (%i,%i,%i,%i,%i,%i,%i);" % (
249 time,vcc,gnd,trials,gcount,scount,lock));
251 self.db.execute("insert into exploits(time,vcc,gnd,trials,count)"
252 "values (%i,%i,%i,%i,%i);" % (
253 time,vcc,gnd,trials,scount));