njit_challenge.py

#coding: utf-8

from md5 import md5


username = '3112005816'
password = '216315'
packet_id = '3'
name = '1'


def to_str(s):
    '''convert hex to str'''
    ret = []
    for i in range(0, 32, 2):
        ret.append(chr(int(s[i:i + 2], 16)))
    return ''.join(ret)


def to_hex(s):
    '''convert str to hex'''
    ret = []
    for i in s:
        ret.append(str(hex(ord(i)))[2:4])
    return ''.join(ret)


def challenge(value):
    s = '%s%s%s' % (packet_id, password, to_str(value))
    return md5(s).hexdigest()


def main():
    value = open('%s.in' % name, 'r').readlines()[0]
    return challenge(value)


if __name__ == '__main__':
    exit(main())