def url_is_time_seeded(url, when):
start = url.find('token=') + len('token=')
token_hex = url[start : start + 8] # 8 hex char = 32 bit
num = int(token_hex, base=16)
try:
s = myrand.find_time_seed(num, when)
except myrand.NoTimeSeed:
return False
else:
return s
def url_is_time_seeded(url, when):
start = url.find('token=') + len('token=')
token_hex = url[start:start + 8] # 8 hex char = 32 bit
num = int(token_hex, base=16)
try:
s = myrand.find_time_seed(num, when)
except myrand.NoTimeSeed:
return False
else:
return s
# chal22.py - MT19937 seed
#
# Copyright (C) 2015 Andrew J. Zimolzak <*****@*****.**>,
# and licensed under GNU GPL version 3. Full notice is found in
# the file 'LICENSE' in the same directory as this file.
from cryptopals import warn
from myrand import MTRNG, find_time_seed
import time
import random
#### Generate a number from RNG seeded with time
time.sleep(random.randint(7, 15)) # 40,1000 is more fun though
r = MTRNG(int(time.time()))
time.sleep(random.randint(7, 15))
target_num = r.extract_number()
#### Reverse engineer the seed
print "Received target of:", target_num
found_seed = find_time_seed(target_num, int(time.time()))
print "Seed used was:", found_seed
print "In other words,", time.ctime(found_seed)
#### tests, if any ####
assert (found_seed > 1441224144)
warn("Passed assertions:", __file__)
# chal22.py - MT19937 seed
#
# Copyright (C) 2015 Andrew J. Zimolzak <*****@*****.**>,
# and licensed under GNU GPL version 3. Full notice is found in
# the file 'LICENSE' in the same directory as this file.
from cryptopals import warn
from myrand import MTRNG, find_time_seed
import time
import random
#### Generate a number from RNG seeded with time
time.sleep(random.randint(7,15)) # 40,1000 is more fun though
r = MTRNG(int(time.time()))
time.sleep(random.randint(7,15))
target_num = r.extract_number()
#### Reverse engineer the seed
print "Received target of:", target_num
found_seed = find_time_seed(target_num, int(time.time()))
print "Seed used was:", found_seed
print "In other words,", time.ctime(found_seed)
#### tests, if any ####
assert(found_seed > 1441224144)
warn("Passed assertions:", __file__)
