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Add new key and extract as zip
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@bkerler
bkerler committed Jan 24, 2021
1 parent d02128d commit 8cc89cd
Showing 1 changed file with 72 additions and 57 deletions.
129 changes: 72 additions & 57 deletions ozipdecrypt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,8 @@
import shutil
import binascii
from Crypto.Cipher import AES
from zipfile import ZipFile
import zipfile
from os.path import basename

def main(file_arg):
keys = [
Expand Down Expand Up @@ -52,6 +53,7 @@ def main(file_arg):
"D1DACF24351CE428A9CE32ED87323216", # Realme1(reserved)
"A1CC75115CAECB890E4A563CA1AC67C8", # A73(reserved)
"2132321EA2CA86621A11241ABA512722", # Realme3(reserved)
"22A21E821743E5EE33AE81B227B1462E"
#F3 Plus CPH1613 - MSM8976
]

Expand Down Expand Up @@ -114,7 +116,6 @@ def decryptfile(key, rfilename):
def decryptfile2(key, rfilename, wfilename):
with open(rfilename,'rb') as rr:
with open(wfilename, 'wb') as wf:
print("Decrypting " + rfilename)
ctx = AES.new(key, AES.MODE_ECB)
bstart = 0
goon = True
Expand All @@ -123,7 +124,7 @@ def decryptfile2(key, rfilename, wfilename):
header = rr.read(12)
if len(header) == 0:
break
if (header != b"OPPOENCRYPT!"):
if header != b"OPPOENCRYPT!":
return 1
rr.seek(0x10 + bstart)
bdsize = int(rr.read(0x10).replace(b"\x00", b"").decode('utf-8'), 10)
Expand Down Expand Up @@ -154,49 +155,62 @@ def mode2(filename):
with open(filename, 'rb') as fr:
magic = fr.read(12)
if magic[:2] == b"PK":
testkey = True
with ZipFile(file_arg, 'r') as zipObj:
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("Extracting " + file_arg)
zipObj.extractall(temp)
tmplen = len(temp)
for r, d, f in os.walk(temp):
for file in f:
rfilename = os.path.join(r, file)
relativefilename = rfilename[tmplen + 1 :]
wfilename = os.path.join(out, relativefilename)
wdirname = os.path.dirname(wfilename)
if not os.path.exists(wdirname):
os.makedirs(wdirname)
encrypted = False
with open(rfilename, 'rb') as rr:
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!"):
encrypted = True
if testkey == True:
with open(os.path.join(temp, "boot.img"), "rb") as rt:
rt.seek(0x50)
data = rt.read(16)
key = keytest(data)
if (key == -1):
print("Unknown AES key, reverse key from recovery first!")
return 1
testkey = False
if encrypted:
if decryptfile2(key, rfilename, wfilename) == 1:
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")
return 1
else:
shutil.move(rfilename, wfilename)

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... files decrypted to: " + out)
print("DONE... file decrypted to: "+outzip)
return 0

print("ozipdecrypt 1.2 (c) B.Kerler 2017-2020")
print("ozipdecrypt 1.3 (c) B.Kerler 2017-2021")
filename = file_arg
with open(filename, 'rb') as fr:
magic = fr.read(12)
Expand All @@ -220,7 +234,7 @@ def mode2(filename):
with open(filename, 'wb') as wf:
fr.seek(0x1050)
print("Decrypting...")
while (True):
while True:
data = fr.read(16)
if len(data) == 0:
break
Expand All @@ -234,11 +248,11 @@ def mode2(filename):
testkey = True
filename = os.path.abspath(file_arg)
path = os.path.abspath(os.path.dirname(filename))
outpath = os.path.join(path, "out")
outpath = os.path.join(path, "tmp")
if os.path.exists(outpath):
shutil.rmtree(outpath)
os.mkdir(outpath)
with ZipFile(filename, 'r') as zo:
with zipfile.ZipFile(filename, 'r') as zo:
clist = []
try:
if zo.extract('oppo_metadata', outpath):
Expand All @@ -248,12 +262,10 @@ def mode2(filename):
except:
print("Detected mode 2....")
return mode2(filename)

if testkey:
fname = ''
if "firmware-update/vbmeta.img" in clist:
fname = "firmware-update/vbmeta.img"
#fname = os.path.join('firmware-update', 'vbmeta.img')
elif "vbmeta.img" in clist:
fname = 'vbmeta.img'
if fname != '':
Expand All @@ -270,28 +282,31 @@ def mode2(filename):
print("Unknown image, please report an issue with image name!")
return 1

for info in zo.infolist():
print("Extracting " + info.filename)
outfile = os.path.join(outpath, info.filename)
if not os.path.exists(outfile):
zo.extract(info.filename, outpath)

if len(clist) > 0:
if info.filename in clist:
decryptfile(key, outfile)
else:
magic = b''
with open(outfile, 'rb') as rr:
magic = rr.read(12)
if (magic == b"OPPOENCRYPT!"):
decryptfile(key, outfile)
print("DONE... files decrypted to: " + outpath)
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

if __name__ == '__main__':
import sys, argparse

parser = argparse.ArgumentParser(description="ozipdecrypt 1.2 (c) B.Kerler 2017-2020", add_help=False)
parser = argparse.ArgumentParser(description="ozipdecrypt 1.3 (c) B.Kerler 2017-2021", add_help=False)
required = parser.add_argument_group('Required')
required.add_argument("filename", help="Path to ozip file")
optional = parser.add_argument_group('Optional')
Expand Down

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