def main():
print("10 random ints seeded with 0")
print("----------------------------")
rand1 = MT19937(0)
for i in range(0, 10):
print(rand1.rand())
print("10 random ints seeded with system time")
print("----------------------------")
rand2 = MT19937(int(time()))
for i in range(0, 10):
print(rand2.rand())
def break_super_secure_random(simulate=False):
result = super_secure_random(simulate)
print("RNG output: %d" % result)
timestamp = simulated_time if simulate else int(time())
while timestamp != 0:
rng = MT19937(timestamp)
res = rng.rand()
if res == result:
return timestamp
timestamp -= 1
raise Exception("Your code is bad and you should feel bad")
def crack_pwreset_token(token):
'''
find seed for password reset token. throw exception if token wasn't
generated by a timestamp-seeded MT19937 PRNG
'''
timestamp = int(time())
# check if timestamp is +12 or -12 hours from current time
timerange = 12 * 60 * 60
for ts in range(timestamp-timerange, timestamp+timerange):
if MT19937(seed=ts).read(len(token)) == token:
return ts
else:
raise Exception("This pw token is probably not generated by a\
timestamp-seeded MT19937 PRNG")
def super_secure_random(simulate=False):
global simulated_time
print("sleeping for random delay")
if simulate:
ts = int(time()) + delay()
simulated_time = ts
else:
sleep(delay())
ts = int(time())
print("timestamp (secret seed): %d" % ts)
rng = MT19937(ts)
print("sleeping for random delay again")
if simulate:
simulated_time += delay()
else:
sleep(delay())
return rng.rand()
def main():
target_rng = MT19937(int(time()))
reverse_rng(target_rng)
reversed_rng = reverse_rng(target_rng)
print("Next value of target RNG: %d" % target_rng.rand())
print("Next value of reversed RNG: %d" % reversed_rng.rand())
def reverse_rng(rng):
untempered = [untemper(rng.rand()) for i in range(624)]
return MT19937(state=untempered)
def get_pwreset_token():
# generate a 16-byte password reset token seeded with current time
return MT19937(seed=int(time())).read(16)
def __init__(self, key):
self.rng = MT19937(seed=key)
def delay(minsec=40, maxsec=1000):
rng = MT19937(int(time()))
return rng.rand() % (maxsec - minsec) + minsec