def mt19937_ctr(text, seedvalue=constants.seedvalue):
rng = mt19937.MT19937(seedvalue)
result = b''
for i in range(0, len(text), 4):
keybytes = rng.randint32().to_bytes(4, 'big')[:len(text[i:i + 4])]
result += set1.xor(text[i:i + 4], keybytes)
return result
def toy_routine():
randsleep()
seed = timestamp()
print('!', seed)
rng = mt19937.MT19937(seed)
randsleep()
return rng()
def challenge23(rndnums):
assert len(rndnums) >= 624
rndnums = rndnums[:624]
rng = mt19937.MT19937()
rng.mt = list(map(untemper, rndnums))
rng.mti = mt19937.N
return rng
def crack(rand):
t = int(time.time())
for i in range(2500, 0, -1):
gn = rng.MT19937(t - i)
if gn.extract_number() == rand:
print("Seed is: ", t - i)
print("Check: ", pg.check(t - i))
return t - i
print("Seek not found")
return 0
def rng_stream(seed):
rng = mt19937.MT19937(seed)
while True:
yield from rng().to_bytes(4, 'big')
import time, secrets
# we use ms instead of s to go faster
def randsleep():
time.sleep((40. + secrets.randbelow(1000)) / 1000.)
def timestamp():
return int(1000. * time.time())
def toy_routine():
randsleep()
seed = timestamp()
print('!', seed)
rng = mt19937.MT19937(seed)
randsleep()
return rng()
if __name__ == '__main__':
t0 = timestamp()
x = toy_routine()
t1 = timestamp()
for t in range(t0, t1):
rng = mt19937.MT19937(t)
if rng() == x:
print('?', t)
def __init__(self):
self.d = 40
self.h = 1000
self.__sleep(random.randint(self.d, self.h))
self.__seed = int(time.time())
self.__gn = rng.MT19937(self.__seed)
#!/usr/bin/env python3
import mt19937 # implem. in mt19937.py
# https://www.cplusplus.com/reference/random/mt19937/
# Values can be controlled by the following C++ code:
'''
#include <iostream>
#include <random>
using namespace std;
int main() {
int seed = 54321;
mt19937 mt(seed);
for (int i=0; i<1000; ++i) cout << mt() << endl;
}
'''
if __name__ == '__main__':
seed = 54321
rng = mt19937.MT19937(seed)
print('MT19937 check...', end=' ', flush=True)
for _ in range(10**5):
rng()
assert rng() == 1827882266
print('ok')
