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"""
Author : Virink <virink@outlook.com>
Date : 2019/08/28, 18:00
"""
import os
import sys
import binascii
import zlib
OUTPUT = 'puzzle'
def bin2hex(data):
return binascii.b2a_hex(data)
def hex2bin(data):
return binascii.a2b_hex(data)
def dec2bin(data, l=1):
l = l / 2
if l == 4:
return hex2bin("%08x" % int(data))
else:
return hex2bin("%02x" % int(data))
def bin2dec(data):
return int(bin2hex(data), 16)
def crc32(chunkType, chunkData):
return dec2bin(binascii.crc32(chunkType + chunkData), 8)
def genIHDR(w, h):
width = dec2bin(w, 8)
height = dec2bin(h, 8)
bits = dec2bin(8)
color_type = dec2bin(2)
compr_method = filter_method = interlace_method = dec2bin(0)
chunkData = width+height+bits+color_type + \
compr_method+filter_method+interlace_method
res = dec2bin(len(chunkData), 8)+b'IHDR' + \
chunkData+crc32(b'IHDR', chunkData)
print([res])
return res
def genIDAT(data):
_c = zlib.crc32(b'IDAT'+data)
if _c < 0:
_c = ~_c ^ 0xffffffff
_crc = dec2bin(_c, 8)
return dec2bin(len(data), 8) + b'IDAT' + data + _crc
def merge_png(width, height, names, output="tmp.png"):
header = hex2bin("89504E470D0A1A0A")
ihdr = genIHDR(width, height)
idat = []
for name in names:
f=open("%s/%s" % (OUTPUT, name),'rb')
data = f.read()
idat.append(genIDAT(data))
f.close()
idat = b''.join(idat)
iend = hex2bin("00000000" + "49454E44" + "AE426082")
with open(output, 'wb') as f:
f.write(header+ihdr+idat+iend)
if __name__ == '__main__':
fs = ["blczioav.data", "ciaoxptf.data", "csizrgxn.data", "dwelszrk.data", "fhnkotmb.data", "fkjhepcs.data", "gpiuezjw.data", "hbctmwqj.data", "jlxphwfm.data", "jrbiznkl.data", "jtxsbevz.data", "kczwtlrd.data", "lstjobzi.data",
"mrxtfkzj.data", "oaeqnubi.data", "pyusgabf.data", "rnydeiho.data", "tihzkoyu.data", "uilqywot.data", "uozjmdnl.data", "wgkapjbh.data", "xufbyndk.data", "xufnmacj.data", "ycqzmbrw.data", "yscijlzx.data", "yvxmeawg.data"]
merge_png(400, 400, ['yvxmeawg.data',
'rnydeiho.data','uozjmdnl.data',
"fhnkotmb.data",'jlxphwfm.data',
'yscijlzx.data','ciaoxptf.data',
'blczioav.data','jtxsbevz.data',
'lstjobzi.data','pyusgabf.data',
'wgkapjbh.data','xufbyndk.data',
'csizrgxn.data','oaeqnubi.data',
'gpiuezjw.data','tihzkoyu.data',
'hbctmwqj.data','ycqzmbrw.data',
'fkjhepcs.data','kczwtlrd.data',
'dwelszrk.data','uilqywot.data',
'xufnmacj.data','jrbiznkl.data',
'mrxtfkzj.data'], "%s.png" % "flag")
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