easyctf-2017/phunkypython1/grader.py

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2017-02-15 17:14:23 +00:00
from cStringIO import StringIO
def get_flag(random):
n = random.randint(10**16, 10**19)
return n
def generate_phunky(random):
n = get_flag(random)
digs = [n + ord(t) for t in 'easyctf']
prog = 'x = 0 # REDACTED\ndigs = {}\nout = ""\nfor letter in reversed(digs):\n out = chr(letter - x) + out\nprint out'.format(str(digs))
return StringIO(prog)
def generate(random):
return dict(files={
"phunky1.py": generate_phunky
})
def grade(random, key):
n = get_flag(random)
if key.find("%d" % n) >= 0:
return True, "Nice work!"
return False, "Nope."