def generate_keystream(text, seed):
keystream = ''
rng = mersenne_rng(seed = seed)
while len(keystream)<len(text):
rn = rng.get_random_number()
next_char_bin = bin(rn)[-8:]
next_char = chr(int(next_char_bin,2))
keystream+=next_char
return keystream
def get_first_rn():
seed = random.randint(1000,500000)
rng = mersenne_twister.mersenne_rng(seed = seed)
return seed, rng.get_random_number()
def crack_seed(first_randint):
s0 = get_state_0(first_randint)
return s0
def test_first_shift():
for i in range(100):
x = random.randint(100,1000000)
y = x^(x>>11)
assert back_out_right_shift(y,11)==x
print 'test complete'
def test_second_shift():
for i in range(100):
x = random.randint(100,1000000)
y = x^((x<<7)&0x9D2C5680)
assert back_out_left_shift_and(y,7,0x9D2C5680)==x
print 'test complete'
if __name__ == "__main__":
seed, rn = get_first_rn()
for i in range(1000,500000):
m = mersenne_twister.mersenne_rng(seed = i)
if rn == m.get_random_number():
print "Seed guess: "+str(i)
print "Actual seed: "+str(seed)
break
def get_first_rn():
seed = random.randint(1000, 500000)
rng = mersenne_twister.mersenne_rng(seed=seed)
return seed, rng.get_random_number()
def crack_seed(first_randint):
s0 = get_state_0(first_randint)
return s0
def test_first_shift():
for i in range(100):
x = random.randint(100, 1000000)
y = x ^ (x >> 11)
assert back_out_right_shift(y, 11) == x
print 'test complete'
def test_second_shift():
for i in range(100):
x = random.randint(100, 1000000)
y = x ^ ((x << 7) & 0x9D2C5680)
assert back_out_left_shift_and(y, 7, 0x9D2C5680) == x
print 'test complete'
if __name__ == "__main__":
seed, rn = get_first_rn()
for i in range(1000, 500000):
m = mersenne_twister.mersenne_rng(seed=i)
if rn == m.get_random_number():
print "Seed guess: " + str(i)
print "Actual seed: " + str(seed)
break
def get_rng():
seed = 438276439281463287
return mersenne_rng(seed = int(seed))
def create_new_rng(original_state):
new_rng = mersenne_rng()
new_rng.state = original_state
new_rng.index = 624
return new_rng