from GoodFET import *;
-# YScale should be to "select max(vcc) from glitches where count=0;"
-
+# After four million points, this kills 32-bit gnuplot.
+# Dumping to a bitmap might be preferable.
script_timevcc="""
plot "< sqlite3 glitch.db 'select time,vcc,glitchcount from glitches where count=0;'" \
with dots \
with dots \
title "Exploited"
""";
-
script_timevccrange="""
plot "< sqlite3 glitch.db 'select time,vcc,glitchcount from glitches where count=0;'" \
with dots \
print "Initializing GoodFET Glitcher."
#Database connection w/ 30 second timeout.
self.db=sqlite3.connect("glitch.db",30000);
- self.db.execute("create table if not exists glitches(time,vcc,gnd,trials,glitchcount,count,lock)");
+
+ #Training
+ self.db.execute("create table if not exists glitches(time,vcc,gnd,trials,glitchcount,count,lock);");
self.db.execute("create index if not exists glitchvcc on glitches(vcc);");
self.db.execute("create index if not exists glitchtime on glitches(time);");
+
+ #Exploitation record, to be built from the training table.
+ self.db.execute("create table if not exists exploits(time,vcc,gnd,trials,count);");
+ self.db.execute("create index if not exists exploitvcc on exploits(vcc);");
+ self.db.execute("create index if not exists exploittime on exploits(time);");
+
self.client=0;
def setup(self,arch="avr"):
self.client=getClient(arch);
+ self.client.serInit();
+
+ def glitchvoltages(self,time):
+ """Returns list of voltages to train at."""
+ c=self.db.cursor();
+ c.execute("""select
+ (select min(vcc) from glitches where time=? and count=1),
+ (select max(vcc) from glitches where time=? and count=0);""",
+ [time, time]);
+ rows=c.fetchall();
+ for r in rows:
+ min=r[0];
+ max=r[1];
+ if(min==None or max==None): return [];
+
+ spread=max-min;
+ return range(min,max,1);
+ #If we get here, there are no points. Return empty set.
+ return [];
+
def graphx11(self):
try:
import Gnuplot, Gnuplot.PlotItems, Gnuplot.funcutils
print "^C to exit.";
while 1==1:
time.sleep(30);
- # g('replot');
def graph(self):
- #try:
import Gnuplot, Gnuplot.PlotItems, Gnuplot.funcutils
- #except ImportError:
- # print "py-gnuplot or py-numpy is missing. Can't graph."
- # return;
g = Gnuplot.Gnuplot(debug=1);
g('\nset term png');
g('set term png');
g('set output "timevcc.png"');
g(script_timevcc);
-
+ def explore(self,tstart=0,tstop=-1, trials=5):
+ """Exploration phase. Uses thresholds to find exploitable points."""
+ gnd=0;
+ self.scansetup(1); #Lock the chip, place key in eeprom.
+ if tstop<0:
+ tstop=self.client.glitchstarttime();
+ times=range(tstart,tstop);
+ random.shuffle(times);
+ for t in times:
+ voltages=self.glitchvoltages(t);
+ print "Exploring %04i points in t=%04i." % (len(voltages),t);
+ sys.stdout.flush();
+ for vcc in voltages:
+ self.scanat(1,trials,vcc,gnd,t);
def learn(self):
- #Learning phase
+ """Learning phase. Finds thresholds at which the chip screws up."""
trials=1;
lock=0; #1 locks, 0 unlocked
vstart=0;
- vstop=0xfff; #Could be as high as 0xFFF
+ vstop=1024; #Could be as high as 0xFFF, but upper range is useless
vstep=1;
tstart=0;
- tstop=-1; #<0 defaults to full range
+ tstop=self.client.glitchstarttime();
tstep=0x1; #Must be 1
- self.scan(lock,trials,vstart,vstop,tstart,tstop);
-
- def scan(self,lock,trials=1,vstart=0,vstop=0xfff,tstart=0,tstop=-1):
+ self.scan(lock,trials,range(vstart,vstop),range(tstart,tstop));
+ print "Learning phase complete, beginning to expore.";
+ self.explore();
+
+ def scansetup(self,lock):
client=self.client;
- self.lock=lock;
- client.serInit();
- if tstop<0:
- tstop=client.glitchstarttime(); #Really long; only use for initial investigation.
- print "-- Start takes %04i cycles." % tstop;
client.start();
client.erase();
self.secret=0x69;
-
+
while(client.eeprompeek(0)!=self.secret):
print "-- Setting secret";
client.start();
#Lock chip to unlock it later.
if lock>0:
client.lock();
- voltages=range(vstart,vstop,1);
- times=range(tstart,tstop,1);
- gnd=0; #TODO, glitch GND.
- vcc=0xfff;
+
+ def scan(self,lock,trials,voltages,times):
+ """Scan many voltages and times."""
+ client=self.client;
+ self.scansetup(lock);
+ gnd=0;
random.shuffle(voltages);
#random.shuffle(times);
for vcc in voltages:
- if not self.vccexplored(vcc):
+ if lock<0 and not self.vccexplored(vcc):
print "Exploring vcc=%i" % vcc;
sys.stdout.flush();
for time in times:
- self.scanat(trials,vcc,gnd,time)
+ self.scanat(lock,trials,vcc,gnd,time)
sys.stdout.flush()
self.db.commit();
else:
print "Voltage %i already explored." % vcc;
sys.stdout.flush();
+
+
def vccexplored(self,vcc):
c=self.db.cursor();
c.execute("select vcc from glitches where vcc=? limit 1;",[vcc]);
for a in rows:
return True;
return False;
- def scanat(self,trials,vcc,gnd,time):
+ def scanat(self,lock,trials,vcc,gnd,time):
client=self.client;
db=self.db;
client.glitchRate(time);
#Try to read *0, which is secret if read works.
a=client.eeprompeek(0x0);
- if self.lock>0: #locked
+ if lock>0: #locked
if(a!=0 and a!=0xFF and a!=self.secret):
gcount+=1;
if(a==self.secret):
- print "-- %04x: %02x HELL YEAH! " % (time, a);
+ print "-- %06i: %02x HELL YEAH! " % (time, a);
scount+=1;
else: #unlocked
if(a!=self.secret):
scount+=1;
#print "values (%i,%i,%i,%i,%i);" % (
# time,vcc,gnd,gcount,scount);
- self.db.execute("insert into glitches(time,vcc,gnd,trials,glitchcount,count,lock)"
+ if(lock>0):
+ self.db.execute("insert into glitches(time,vcc,gnd,trials,glitchcount,count,lock)"
"values (%i,%i,%i,%i,%i,%i,%i);" % (
- time,vcc,gnd,trials,gcount,scount,self.lock));
+ time,vcc,gnd,trials,gcount,scount,lock));
+ else:
+ self.db.execute("insert into exploits(time,vcc,gnd,trials,count)"
+ "values (%i,%i,%i,%i,%i);" % (
+ time,vcc,gnd,trials,scount));
projects / goodfet / commitdiff