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ozipdecrypt.py
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ozipdecrypt.py
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#!/usr/bin/env python3
# (c) B. Kerler 2017-2020, licensed under MIT license
"""
Usage:
ozipdecrypt.py --help
ozipdecrypt.py <filename>
Options:
Mode 1 for regular ozip, Mode 2 for CPH1803/CPH1909 [default: 1]
"""
import binascii
import os
import shutil
import stat
import zipfile
from Crypto.Cipher import AES
def main(file_arg):
keys = [
"D6EECF0AE5ACD4E0E9FE522DE7CE381E", # mnkey
"D6ECCF0AE5ACD4E0E92E522DE7C1381E", # mkey
"D6DCCF0AD5ACD4E0292E522DB7C1381E",
# realkey, R9s CPH1607 MSM8953, Plus, R11, RMX1921 Realme XT, RMX1851EX Realme Android 10, RMX1992EX_11_OTA_1050
"D7DCCE1AD4AFDCE2393E5161CBDC4321", # testkey
"D7DBCE2AD4ADDCE1393E5521CBDC4321", # utilkey
"D7DBCE1AD4AFDCE1393E5121CBDC4321", # R11s CPH1719 MSM8976, Plus
"D4D2CD61D4AFDCE13B5E01221BD14D20", # FindX CPH1871 SDM845
"261CC7131D7C1481294E532DB752381E", # FindX
"1CA21E12271335AE33AB81B2A7B14622", # Realme 2 pro SDM660/MSM8976
"D4D2CE11D4AFDCE13B3E0121CBD14D20", # K1 SDM660/MSM8976
"1C4C1EA3A12531AE491B21BB31613C11", # Realme 3 Pro SDM710, X, 5 Pro, Q, RMX1921 Realme XT
"1C4C1EA3A12531AE4A1B21BB31C13C21", # Reno 10x zoom PCCM00 SDM855, CPH1921EX Reno 5G
"1C4A11A3A12513AE441B23BB31513121", # Reno 2 PCKM00 SDM730G
"1C4A11A3A12589AE441A23BB31517733", # Realme X2 SDM730G
"1C4A11A3A22513AE541B53BB31513121", # Realme 5 SDM665
"2442CE821A4F352E33AE81B22BC1462E", # R17 Pro SDM710
"14C2CD6214CFDC2733AE81B22BC1462C", # CPH1803 OppoA3s SDM450/MSM8953
"1E38C1B72D522E29E0D4ACD50ACFDCD6",
"12341EAAC4C123CE193556A1BBCC232D",
"2143DCCB21513E39E1DCAFD41ACEDBD7",
"2D23CCBBA1563519CE23C1C4AA1E3412", # A77 CPH1715 MT6750T
"172B3E14E46F3CE13E2B5121CBDC4321", # Realme 1 MTK P60
"ACAA1E12A71431CE4A1B21BBA1C1C6A2", # Realme U1 RMX1831 MTK P70
"ACAC1E13A72531AE4A1B22BB31C1CC22", # Realme 3 RMX1825EX P70
"1C4411A3A12533AE441B21BB31613C11", # A1k CPH1923 MTK P22
"1C4416A8A42717AE441523B336513121", # Reno 3 PCRM00 MTK 1000L, CPH2059 OPPO A92, CPH2067 OPPO A72
"55EEAA33112133AE441B23BB31513121", # RenoAce SDM855Plus
"ACAC1E13A12531AE4A1B21BB31C13C21", # Reno, K3
"ACAC1E13A72431AE4A1B22BBA1C1C6A2", # A9
"12CAC11211AAC3AEA2658690122C1E81", # A1,A83t
"1CA21E12271435AE331B81BBA7C14612", # CPH1909 OppoA5s MT6765
"D1DACF24351CE428A9CE32ED87323216", # Realme1(reserved)
"A1CC75115CAECB890E4A563CA1AC67C8", # A73(reserved)
"2132321EA2CA86621A11241ABA512722", # Realme3(reserved)
"22A21E821743E5EE33AE81B227B1462E"
# F3 Plus CPH1613 - MSM8976
]
def keytest(data):
for key in keys:
ctx = AES.new(binascii.unhexlify(key), AES.MODE_ECB)
dat = ctx.decrypt(data)
if dat[0:4] == b'\x50\x4B\x03\x04':
print("Found correct AES key: " + key)
return binascii.unhexlify(key)
elif dat[0:4] == b'\x41\x56\x42\x30':
print("Found correct AES key: " + key)
return binascii.unhexlify(key)
elif dat[0:4] == b'\x41\x4E\x44\x52':
print("Found correct AES key: " + key)
return binascii.unhexlify(key)
return -1
def del_rw(action, name, exc):
os.chmod(name, stat.S_IWRITE)
os.remove(name)
def rmrf(path):
if os.path.exists(path):
if os.path.isfile(path):
del_rw("", path, "")
else:
shutil.rmtree(path, onerror=del_rw)
def decryptfile(key, rfilename):
with open(rfilename, 'rb') as rr:
with open(rfilename + ".tmp", 'wb') as wf:
rr.seek(0x10)
dsize = int(rr.read(0x10).replace(b"\x00", b"").decode('utf-8'), 10)
rr.seek(0x1050)
print("Decrypting " + rfilename)
flen = os.stat(rfilename).st_size - 0x1050
ctx = AES.new(key, AES.MODE_ECB)
while dsize > 0:
if flen > 0x4000:
size = 0x4000
else:
size = flen
data = rr.read(size)
if dsize < size:
size = dsize
if len(data) == 0:
break
dr = ctx.decrypt(data)
wf.write(dr[:size])
flen -= size
dsize -= size
os.remove(rfilename)
os.rename(rfilename + ".tmp", rfilename)
def decryptfile2(key, rfilename, wfilename):
with open(rfilename, 'rb') as rr:
with open(wfilename, 'wb') as wf:
ctx = AES.new(key, AES.MODE_ECB)
bstart = 0
goon = True
while goon:
rr.seek(bstart)
header = rr.read(12)
if len(header) == 0:
break
if header != b"OPPOENCRYPT!":
return 1
rr.seek(0x10 + bstart)
bdsize = int(rr.read(0x10).replace(b"\x00", b"").decode('utf-8'), 10)
if bdsize < 0x40000:
goon = False
rr.seek(0x50 + bstart)
while bdsize > 0:
data = rr.read(0x10)
if len(data) == 0:
break
size = 0x10
if bdsize < 0x10:
size = bdsize
dr = ctx.decrypt(data)
wf.write(dr[:size])
bdsize -= 0x10
data = rr.read(0x3FF0)
if len(data) == 0:
break
bdsize -= 0x3FF0
wf.write(data)
bstart = bstart + 0x40000 + 0x50
return 0
def mode2(filename):
temp = os.path.join(os.path.abspath(os.path.dirname(filename)), "temp")
out = os.path.join(os.path.abspath(os.path.dirname(filename)), "out")
with open(filename, 'rb') as fr:
magic = fr.read(12)
if magic[:2] == b"PK":
with zipfile.ZipFile(file_arg, 'r') as zipObj:
if os.path.exists(temp):
rmrf(temp)
os.mkdir(temp)
if os.path.exists(out):
rmrf(out)
os.mkdir(out)
print("Finding key... " + file_arg)
for zi in zipObj.infolist():
orgfilename = zi.filename
if "boot.img" in orgfilename:
zi.filename = "out"
zipObj.extract(zi, temp)
zi.filename = orgfilename
with open(os.path.join(temp, "out"), 'rb') as rr:
magic = rr.read(12)
if magic == b"OPPOENCRYPT!":
rr.seek(0x50)
data = rr.read(16)
key = keytest(data)
if key == -1:
print("Unknown AES key, reverse key from recovery first!")
return 1
else:
break
else:
print("Unknown mode2, boot.img wasn't encrypted")
break
print("Extracting... " + file_arg)
outzip = filename[:-4] + 'zip'
if os.path.exists(outzip):
os.remove(outzip)
with zipfile.ZipFile(outzip, 'w', zipfile.ZIP_DEFLATED) as WzipObj:
for zi in zipObj.infolist():
orgfilename = zi.filename
zi.filename = "out"
zipObj.extract(zi, temp)
zi.filename = orgfilename
with open(os.path.join(temp, "out"), 'rb') as rr:
magic = rr.read(12)
if magic == b"OPPOENCRYPT!":
print("Decrypting " + orgfilename)
if decryptfile2(key, os.path.join(temp, "out"),
os.path.join(temp, "out") + ".dec") == 1:
return 1
WzipObj.write(os.path.join(temp, "out") + ".dec", orgfilename)
os.remove(os.path.join(temp, "out"))
os.remove(os.path.join(temp, "out") + ".dec")
else:
WzipObj.write(os.path.join(temp, "out"), orgfilename)
os.remove(os.path.join(temp, "out"))
rmrf(temp)
print("DONE... file decrypted to: " + outzip)
return 0
print("ozipdecrypt 1.31 (c) B.Kerler 2017-2021")
filename = file_arg
with open(filename, 'rb') as fr:
magic = fr.read(12)
if magic == b"OPPOENCRYPT!":
pk = False
elif magic[:2] == b"PK":
pk = True
else:
print("ozip has unknown magic, OPPOENCRYPT! expected!")
return 1
if not pk:
fr.seek(0x1050)
data = fr.read(16)
key = keytest(data)
if key == -1:
print("Unknown AES key, reverse key from recovery first!")
return 1
ctx = AES.new(key, AES.MODE_ECB)
filename = file_arg[:-4] + "zip"
with open(filename, 'wb') as wf:
fr.seek(0x1050)
print("Decrypting...")
while True:
data = fr.read(16)
if len(data) == 0:
break
wf.write(ctx.decrypt(data))
data = fr.read(0x4000)
if len(data) == 0:
break
wf.write(data)
print("DONE!!")
else:
testkey = True
filename = os.path.abspath(file_arg)
path = os.path.abspath(os.path.dirname(filename))
outpath = os.path.join(path, "tmp")
if os.path.exists(outpath):
shutil.rmtree(outpath)
os.mkdir(outpath)
with zipfile.ZipFile(filename, 'r') as zo:
clist = []
try:
if zo.extract('oppo_metadata', outpath):
with open(os.path.join(outpath, 'oppo_metadata')) as rt:
for line in rt:
clist.append(line[:-1])
except Exception as e:
print(str(e))
print("Detected mode 2....")
return mode2(filename)
if testkey:
fname = ''
if "firmware-update/vbmeta.img" in clist:
fname = "firmware-update/vbmeta.img"
elif "vbmeta.img" in clist:
fname = 'vbmeta.img'
if fname != '':
if zo.extract(fname, outpath):
with open(os.path.join(outpath, fname.replace("/", os.sep)), "rb") as rt:
rt.seek(0x1050)
data = rt.read(16)
key = keytest(data)
if key == -1:
print("Unknown AES key, reverse key from recovery first!")
return 1
testkey = False
if testkey:
print("Unknown image, please report an issue with image name!")
return 1
outzip = filename[:-4] + 'zip'
with zipfile.ZipFile(outzip, 'w', zipfile.ZIP_DEFLATED) as WzipObj:
for info in zo.infolist():
print("Extracting " + info.filename)
orgfilename = info.filename
info.filename = "out"
zo.extract(info, outpath)
info.filename = orgfilename
if len(clist) > 0:
if info.filename in clist:
decryptfile(key, os.path.join(outpath, "out"))
WzipObj.write(os.path.join(outpath, "out"), orgfilename)
else:
with open(os.path.join(outpath, "out"), 'rb') as rr:
magic = rr.read(12)
if magic == b"OPPOENCRYPT!":
decryptfile(key, os.path.join(outpath, "out"))
WzipObj.write(os.path.join(outpath, "out"), orgfilename)
print("DONE... files decrypted to: " + outzip)
return 0