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ofp_mtk_decrypt.py
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#!/usr/bin/env python3
# Oppo OFP MTK Decrypter (c) B. Kerler 2022
# Licensed under MIT License
import os
import sys
import hashlib
from Crypto.Cipher import AES
from struct import unpack
from binascii import unhexlify, hexlify
def swap(ch):
return ((ch & 0xF) << 4) + ((ch & 0xF0) >> 4)
def keyshuffle(key, hkey):
for i in range(0, 0x10, 4):
key[i] = swap((hkey[i] ^ key[i]))
key[i + 1] = swap(hkey[i + 1] ^ key[i + 1])
key[i + 2] = swap(hkey[i + 2] ^ key[i + 2])
key[i + 3] = swap(hkey[i + 3] ^ key[i + 3])
return key
def mtk_shuffle(key, keylength, input, inputlength):
for i in range(0, inputlength):
k = key[(i % keylength)]
h = ((((input[i]) & 0xF0) >> 4) | (16 * ((input[i]) & 0xF)))
input[i] = k ^ h
return input
def mtk_shuffle2(key, keylength, input, inputlength):
for i in range(0, inputlength):
tmp = key[i % keylength] ^ input[i]
input[i] = ((tmp & 0xF0) >> 4) | (16 * (tmp & 0xF))
return input
def aes_cfb(key, iv, data, decrypt=True, segment_size=128):
cipher = AES.new(key, AES.MODE_CFB, IV=iv, segment_size=segment_size)
if decrypt:
plaintext = cipher.decrypt(data)
return plaintext
else:
ciphertext = cipher.encrypt(data)
return ciphertext
keytables = [
["67657963787565E837D226B69A495D21", # A77 CPH1715EX_11_A.04_170426, F1S A1601_MT6750_EX_11_A.15_160913 FW
"F6C50203515A2CE7D8C3E1F938B7E94C",
"42F2D5399137E2B2813CD8ECDF2F4D72"],
["9E4F32639D21357D37D226B69A495D21", # A77 CPH1715EX_11_A.04_170426, F1S A1601_MT6750_EX_11_A.15_160913 CDT
"A3D8D358E42F5A9E931DD3917D9A3218",
"386935399137416B67416BECF22F519A"],
["892D57E92A4D8A975E3C216B7C9DE189",
"D26DF2D9913785B145D18C7219B89F26",
"516989E4A1BFC78B365C6BC57D944391"],
["27827963787265EF89D126B69A495A21",
"82C50203285A2CE7D8C3E198383CE94C",
"422DD5399181E223813CD8ECDF2E4D72"],
["3C4A618D9BF2E4279DC758CD535147C3",
"87B13D29709AC1BF2382276C4E8DF232",
"59B7A8E967265E9BCABE2469FE4A915E"],
["1C3288822BF824259DC852C1733127D3", # A83_CPH1827_11_A.21_2G_180923 FW, Realme 3 RMX1827EX_11_C.13_200624_1264686e
"E7918D22799181CF2312176C9E2DF298",
"3247F889A7B6DECBCA3E28693E4AAAFE"],
["1E4F32239D65A57D37D2266D9A775D43",
"A332D3C3E42F5A3E931DD991729A321D",
"3F2A35399A373377674155ECF28FD19A"],
["122D57E92A518AFF5E3C786B7C34E189",
"DD6DF2D9543785674522717219989FB0",
"12698965A132C76136CC88C5DD94EE91"],
[
"ab3f76d7989207f2", # AES KEY
"2bf515b3a9737835" # AES IV
]
]
def getkey(index):
kt = keytables[index]
if len(kt) == 3:
obskey = bytearray(unhexlify(kt[0]))
encaeskey = bytearray(unhexlify(kt[1]))
encaesiv = bytearray(unhexlify(kt[2]))
aeskey = hexlify(hashlib.md5(mtk_shuffle2(obskey, 16, encaeskey, 16)).digest())[:16]
aesiv = hexlify(hashlib.md5(mtk_shuffle2(obskey, 16, encaesiv, 16)).digest())[:16]
else:
aeskey = bytes(kt[0], 'utf-8')
aesiv = bytes(kt[1], 'utf-8')
print(aeskey, aesiv)
return aeskey, aesiv
def brutekey(rf):
rf.seek(0)
encdata = rf.read(16)
for keyid in range(0, len(keytables)):
aeskey, aesiv = getkey(keyid)
data = aes_cfb(aeskey, aesiv, encdata, True)
if data[:3] == b"MMM":
return aeskey, aesiv
print("Unknown key. Please ask the author for support :)")
exit(0)
def cleancstring(input):
return input.replace(b"\x00", b"").decode('utf-8')
def main(filename, outdir):
if not os.path.exists(outdir):
os.mkdir(outdir)
hdrkey = bytearray(b"geyixue")
filesize = os.stat(filename).st_size
hdrlength = 0x6C
with open(filename, 'rb') as rf:
aeskey, aesiv = brutekey(rf)
rf.seek(filesize - hdrlength)
hdr = mtk_shuffle(hdrkey, len(hdrkey), bytearray(rf.read(hdrlength)), hdrlength)
prjname, unknownval, reserved, cpu, flashtype, hdr2entries, prjinfo, crc = unpack("46s Q 4s 7s 5s H 32s H", hdr)
hdr2length = hdr2entries * 0x60
prjname = cleancstring(prjname)
prjinfo = cleancstring(prjinfo)
cpu = cleancstring(cpu)
flashtype = cleancstring(flashtype)
if prjname != "": print(f"Detected prjname:{prjname}")
if prjinfo != "": print(f"Detected prjinfo:{prjinfo}")
if cpu != "": print(f"Detected cpu:{cpu}")
if flashtype != "": print(f"Detected flash:{flashtype}")
rf.seek(filesize - hdr2length - hdrlength)
hdr2 = mtk_shuffle(hdrkey, len(hdrkey), bytearray(rf.read(hdr2length)), hdr2length)
for i in range(0, len(hdr2) // 0x60):
name, start, length, enclength, filename, crc = unpack("<32s Q Q Q 32s Q", hdr2[i * 0x60:(i * 0x60) + 0x60])
name = name.replace(b"\x00", b"").decode('utf-8')
filename = filename.replace(b"\x00", b"").decode('utf-8')
print(f"Writing \"{name}\" as \"{outdir}/{filename}\"...")
with open(os.path.join(outdir, filename), 'wb') as wb:
if enclength > 0:
rf.seek(start)
encdata = rf.read(enclength)
if enclength % 16 != 0:
encdata += b"\x00" * (16 - (enclength % 16))
data = aes_cfb(aeskey, aesiv, encdata, True)
wb.write(data[:enclength])
length -= enclength
while length > 0:
size = 0x200000
if length < size:
size = length
data = rf.read(size)
length -= size
wb.write(data)
print(f"Files successfully decrypted to subdirectory {outdir}")
if __name__ == '__main__':
if len(sys.argv) != 3:
print("Oppo MTK OFP decrypt tool 1.1 (c) B.Kerler 2020-2022\n")
print("Usage: %s <filename> <directory to extract>" % __file__)
sys.exit(1)
filename = sys.argv[1]
outdir = sys.argv[2]
main(filename, outdir)