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SaveTools.py
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SaveTools.py
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# -*- coding: utf-8 -*-
"""
Created on Sat Jul 10 04:11:51 2021
@author: AsteriskAmpersand
"""
import crccheck
import subprocess
import os
import sys
from pathlib import Path
from Cryptodome.Cipher import Blowfish
from Cryptodome.Hash import SHA1
from EncryptionKeys import keys
def nullOutput(*args,**kwargs):
return
def chunks(l, n):
"""Yield successive n-sized chunks from l."""
for i in range(0, len(l), n):
yield l[i:i + n]
def endianness_reversal(data):
return b''.join(map(lambda x: x[::-1],chunks(data, 4)))
def CapcomDecrypt(file, key ):
cipher = Blowfish.new(key, Blowfish.MODE_ECB)
return bytearray(endianness_reversal(cipher.decrypt(endianness_reversal(file))))
def CapcomEncrypt(file, key ):
cipher = Blowfish.new(key, Blowfish.MODE_ECB)
return endianness_reversal(cipher.encrypt(endianness_reversal(file)))
def replaceData(inFile, outFile, value):
w = inFile.open("rb").read()#CapcomDecrypt()
#w[10:14] = struct.pack("I",value)
with outFile.open("wb") as outf:
outf.write(w)#CapcomEncrypt()
return
def crc32(key):
return crccheck.crc.CrcJamcrc().calc(key).to_bytes(4,"little")
def sha1(data):
h = SHA1.new()
h.update(data)
return endianness_reversal(h.digest())
hexToBin = lambda keycandidate: bytes(map(lambda x: int(x,16),keycandidate.split(" ")))
decToBin = lambda keycandidate: bytes(map(lambda x: int(x,10),keycandidate.split(" ")))
HEADER = 0x30
SHASTART = 0x40
STEAMIDLOC = 8407304
def buildHeader(dBody,pckey):
preamble = hexToBin("01 00 00 00 00 00 00 00 18 00 00 00")
key = crc32(pckey)
mid = hexToBin("70 80 80 00")
epilogue = hexToBin("00 00 00 00 00 00 00 00")
sha = sha1(dBody[SHASTART:])
return preamble+sha+mid+key+epilogue
def replaceHeader(dBody,pckey):
return buildHeader(dBody,pckey)+dBody[HEADER:]
def getSteamKey(steamId64):
#exe = sys.executable
pq = subprocess.Popen(["AndoStories2Tool.exe",str(steamId64)],stdout=subprocess.PIPE,stderr=subprocess.DEVNULL, stdin=subprocess.DEVNULL)
result = pq.communicate()[0]
key,steam32id = result.split(b"\n")
return key[:-2],int(steam32id)
def insertID(dbody,steamId32):
return dbody[:STEAMIDLOC]+steamId32.to_bytes(4,"little")+dbody[STEAMIDLOC+4:]
def steamTransfer(dBody,pckey,steamid32):
dBody = insertID(dBody,steamid32)
dBody = replaceHeader(dBody,pckey)
return dBody
def dataSwitchToPC(switchdata,pckey,steamId32):
epilogue = hexToBin("00 00 00 00 00 00 00 00")
skeleton = switchdata[:0xC] + b"\x00"*HEADER + switchdata[0xC:] + epilogue
return steamTransfer(skeleton,pckey,steamId32)
def dataPCToSwitch(dPcdata):
insertID(dPcdata,0)
return dPcdata[:0xC]+dPcdata[0xC+HEADER:-8]
def fileSwitchToPC(switchfilepath,steamId64,pcfilepath):
with open(switchfilepath,"rb") as inf:
dSwitch = inf.read()
pckey,steamId32 = getSteamKey(steamId64)
dBody = dataSwitchToPC(dSwitch,pckey,steamId32)
eBody = CapcomEncrypt(dBody,pckey)
with open(pcfilepath,"wb") as outf:
outf.write(eBody)
def tryKeys(eBody):
teststr = eBody[-8:]
for key in keys:
test = CapcomDecrypt(teststr,key[:-1])
if sum(test) == 0:
return key[:-1]
else:
raise ValueError("Could not find encryption key")
def filePCtoPC(pcfilepath,steamId64,pcfilepathout):
with open(pcfilepath,"rb") as inf:
eBody = inf.read()
inkey = tryKeys(eBody)
pckey,steamId32 = getSteamKey(steamId64)
dBody = CapcomDecrypt(eBody,inkey)
dOut = steamTransfer(dBody,pckey,steamId32)
eOut = CapcomEncrypt(dOut,pckey)
with open(pcfilepathout,"wb") as outf:
outf.write(eOut)
def filePCtoSwitch(pcfilepath,switchfilepathout,output = nullOutput):
output("Converting")
output(" from PC Save File:%s"%(pcfilepath))
output(" to NSW Save File:%s"%(switchfilepathout))
with open(pcfilepath,"rb") as inf:
eBody = inf.read()
if len(eBody) != 8421552:
output("%s is not a PC Save File"%(pcfilepath))
return
raise ValueError("Not a PC MHS2 Save File")
inkey = tryKeys(eBody)
dBody = CapcomDecrypt(eBody,inkey)
dOut = dataPCToSwitch(dBody)
with open(switchfilepathout,"wb") as outf:
outf.write(dOut)
output("Completed Conversion")
def fileTransfer(filepath,steamId64,fileout,output = nullOutput):
fsize = os.stat(filepath).st_size
if fsize == 8421552:
output("Converting")
output(" from PC Save File:%s"%(filepath))
output(" to PC Save File:%s"%(fileout))
filePCtoPC(filepath,steamId64,fileout)
elif fsize == 8421496:
output("Converting")
output(" from NSW Save File:%s"%(filepath))
output(" to PC Save File:%s"%(fileout))
fileSwitchToPC(filepath,steamId64,fileout)
else:
raise ValueError("Not a MHS2 Save File")
output("Completed Conversion")
def decryptPC(pcfilepath,pcfilepathout,output = nullOutput):
with open(pcfilepath,"rb") as inf:
eBody = inf.read()
if len(eBody) != 8421552:
output("%s is not a PC Save File"%(pcfilepath))
return
raise ValueError("Not a PC MHS2 Save File")
pckey = tryKeys(eBody)
output("Decryption Key %s"%pckey)
dBody = CapcomDecrypt(eBody,pckey)
with open(pcfilepathout,"wb") as outf:
outf.write(dBody)
output("Completed Decryption")
def encryptPC(pcfilepath,steamId64,pcfilepathout,output = nullOutput):
with open(pcfilepath,"rb") as inf:
dBody = inf.read()
if len(dBody) != 8421552:
output("%s is not a PC Save File"%(pcfilepath))
return
raise ValueError("Not a PC MHS2 Save File")
pckey,steamId32 = getSteamKey(steamId64)
output("Decryption Key [%s]"%pckey.decode())
output("Partial ID %X"%steamId32)
dOut = steamTransfer(dBody,pckey,steamId32)
eBody = CapcomEncrypt(dOut,pckey)
with open(pcfilepathout,"wb") as outf:
outf.write(eBody)
output("Completed Encryption")
SKIN_TONE_PRESETS = [
[0x87, 0x5D, 0x46, 0x00], # Converts to [0x87, 0x41, 0x26, 0x00],
[0xB8, 0x86, 0x65, 0x00], # Converts to [0xB6, 0x6A, 0x37, 0x00],
[0xDE, 0xAB, 0x8E, 0x00], # Converts to [0xDE, 0x88, 0x4D, 0x00],
[0xEA, 0xC8, 0xA6, 0x00], # Converts to [0xEA, 0x9F, 0x5A, 0x00],
[0xF9, 0xE9, 0xD2, 0x00], # Converts to [0xF9, 0xB9, 0x72, 0x00],
[0xFF, 0xFF, 0xFF, 0x00], # Converts to [0xFF, 0xCB, 0x8B, 0x00],
]
SKIN_TONE_OFFSET = 0x2D2B08
SKIN_TONE_OFFSET_2 = 0x8000E8
# Fixes the "Corrupt Data" multiplayer issue caused by non-preset skin tones
def fixSave(pcfilepath, pcfilepathout, steamId64, skinChoice, output = nullOutput):
with open(pcfilepath,"rb") as inf:
eBody = inf.read()
if len(eBody) != 8421552:
output("%s is not a PC Save File"%(pcfilepath))
return
# Decrypt
pckey = tryKeys(eBody)
output("Decryption Key %s"%pckey)
dBody = CapcomDecrypt(eBody,pckey)
# Patch skin tone to chosen present.
choiceData = SKIN_TONE_PRESETS[skinChoice]
dBody[SKIN_TONE_OFFSET:SKIN_TONE_OFFSET+4] = choiceData
dBody[SKIN_TONE_OFFSET_2:SKIN_TONE_OFFSET_2+4] = choiceData
output("Updated skin tone to: %s"%''.join(['%X'%x for x in choiceData]))
# Encrypt
pckey,steamId32 = getSteamKey(steamId64)
output("Partial ID %X"%steamId32)
dOut = steamTransfer(dBody,pckey,steamId32)
eBody = CapcomEncrypt(dOut,pckey)
try:
with open(pcfilepathout,"wb") as outf:
outf.write(eBody)
output("Completed Encryption")
except:
output("Couldn't write to output file")
if __name__ in '__main__':
import struct
saveTarget = sys.argv[1]
with open(saveTarget,"rb") as inf:
magic = inf.read(4)
inf.seek(STEAMIDLOC)
steam32 = struct.unpack("i",inf.read(4))[0]
if magic == b'\x1C\xCC\xE3\x5F':
decryptPC(saveTarget,saveTarget)
else:
steamid = steam32+76561197960265728
encryptPC(saveTarget,steamid,saveTarget)