某手游lua文件解密脚本

happyelement_lua_decrypt.py

# -*- coding:utf-8 -*-
import io
import os
import base64
import pyDes
import binascii
import sys
import crypto
import json
import zlib
sys.modules['Crypto'] = crypto
from crypto.Cipher import AES

"""
解密lua脚本
"""

def decdata(c):
    key = '\xe9\x74\x7d\x92\xcc\x32\x2e\x7d\x11\x2e\x7c\x34\x51\xd7\xb3\x6a'
    iv = c[0:16]
    main_data = c[16:]
    print "取走iv值的文件长度",
    print len(main_data)    
    cryptor = AES.new(key, AES.MODE_CBC, iv)
    pad_compress_data = cryptor.decrypt(main_data)
    print "解密后未压缩的文件大小",
    print len(pad_compress_data)
    str_len = len(pad_compress_data)
    pad = ord(pad_compress_data[-1])
    print "pad值是：", pad

    compress_data = pad_compress_data[0:str_len-pad]
    print "compress_data结束位置：", str_len-pad
    plain_text = zlib.decompress(compress_data)
    # plain_text = zlib.compress(compress_data)
    return plain_text
if __name__ == '__main__':
    indir = '/Users/johnhao/Downloads/anti/com.happyelements.AndroidAnimal.qq_1.53_53/assets/src'   #输入文件夹
    outdir= '/Users/johnhao/Downloads/happyelement'   #输出文件夹
    exstr='.lua' #输入文件的扩展名 
    for path, subdirs, files in os.walk(indir):
        for filename in files:
            if filename.endswith(exstr):
                infilename = path + os.sep + filename
                size = os.path.getsize(infilename)

                with open(infilename, 'rb') as inFile:
                    data = inFile.read()
                    inFile.close()
                if True:
                    try:
                        print "加密的文件长度是",
                        print len(data)
                        result = decdata(data)
                        print "解密后文件的长度",
                        print len(result)
                    except:
                        print "FAILED!!!!",
                        print infilename
                        break
                outfilename = outdir + infilename.replace(indir, '', 1)
                print outfilename
                
                outPath, outFilename = os.path.split(outfilename)
                if not os.path.exists(outPath):
                    os.makedirs(outPath)
                with open(outfilename, 'wb') as outFile:
                    outFile.write(result)
                    outFile.close()