Created
May 18, 2017 12:59
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import zipfile | |
import xxtea | |
import re | |
import os | |
# setXXTEAKeyAndSign | |
apk = zipfile.ZipFile("xxxx.apk", "r") | |
probe_file = [] | |
for filename in apk.namelist(): | |
if filename.endswith(".luac"): | |
probe_file.append(apk.read(filename)) | |
print ('File:', filename) | |
if len(probe_file)==2: | |
break | |
sign = [] | |
for i in range(len(probe_file[0])): | |
if probe_file[0][i]!=probe_file[1][i]: | |
sign= probe_file[0][:i] | |
break | |
print('Sign:', sign, len(sign)) | |
key = [] | |
pattern = re.compile("(\w+)\0") | |
for filename in apk.namelist(): | |
if filename.endswith("libcocos2dlua.so"): | |
print ('File:', filename) | |
content = apk.read(filename) | |
pos = content.find(sign) | |
subcontent = content[pos-512:pos+512] | |
sign = sign.decode() | |
strlist = pattern.findall(subcontent.decode("ascii", "ignore")) | |
for index, found_str in enumerate(strlist): | |
if found_str==sign: | |
key = strlist[index-1].encode('ascii') | |
print('Key:', key) | |
for filename in apk.namelist(): | |
if filename.endswith(".luac"): | |
content = apk.read(filename) | |
data = b'' | |
data = xxtea.decrypt(content[len(sign):], key) | |
filename = os.path.splitext(filename)[0] + ".lua" | |
os.makedirs(os.path.dirname(filename), exist_ok=True) | |
print(filename) | |
with open(filename, 'wb') as decrypted_file: | |
decrypted_file.write(data) |
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