result_file_path = "maze/maze/my.zip"

email_md5 = "bbb8b499a0eef99b52c7f13f4e78c24b"

# first_step(file_path)

second_step(email_md5, file_path, result_file_path)

get_bytes_md5(file.read())

def second_step(target, file_path, result_file_path):

file = open(file_path, "rb")

bs = file.read()

finished = False

for i in range(len(bs)):

for j in range(256):

bs_head = bs[: i]

bs_center = chr(j).encode("latin1")

bs_tail = bs[i + 1:]

new_bs = bs_head + bs_center + bs_tail

now = get_bytes_md5(new_bs)

if now == target:

result_file = open(result_file_path, "wb")

result_file.write(bs)

print("Done! result={}".format(result_file_path))

finished = True

break

if finished:

break

def get_bytes_md5(hex_string):

mymd5 = hashlib.md5()

mymd5.update(hex_string)

hexdigest = mymd5.hexdigest()

return hexdigest

result: http://www.pythonchallenge.com/pc/hex/speedboat.html

import hashlib

- we get mybroken.zip in level 24

- the decent means leopold mozart

- we have sent an email to leopold mozart in level 19

- fix the broken zip file to match the md5

# read_bin_file("lake/lake1.jpg")

read_bin_file("maze/maze/mybroken.zip")