chaomengcfx/arkassetstool

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arkassetstool's Issues

Not sure how to use it on downloaded file.

I tried to use
import os
from Crypto.Cipher import AES

class ArkAssets:
CHAT_MASK = bytes.fromhex('554954704169383270484157776e7a7148524d4377506f6e4a4c49423357436c').decode()

@staticmethod
def text_asset_decrypt(stream, has_rsa: bool = True) -> bytes:
    aes_key = ArkAssets.CHAT_MASK[:16].encode()
    aes_iv  = bytearray(16)
    data = stream[128:] if has_rsa else stream
    buf = data[:16]
    mask = ArkAssets.CHAT_MASK[16:].encode()
    for i in range(len(buf)):
        aes_iv[i] = buf[i] ^ mask[i]
    aes_obj = AES.new(aes_key, AES.MODE_CBC, aes_iv)
    decrypt_buf = aes_obj.decrypt(data[16:])
    unpad = lambda s: s[0:(len(s) - s[-1])]
    return unpad(decrypt_buf)

Get the current folder path

folder_path = os.getcwd()

Get all files in the current folder

file_list = os.listdir(folder_path)

Decrypt each byte file in the folder

for file_name in file_list:
if os.path.isfile(file_name):
with open(file_name, 'rb') as file:
encrypted_data = file.read()
decrypted_data = ArkAssets.text_asset_decrypt(encrypted_data)
new_file_name = file_name + '.decrypted'
with open(new_file_name, 'wb') as decrypted_file:
decrypted_file.write(decrypted_data)
But it doesn't work, I am not familar with code - -. I am only trying to decrypt bytes files in assets/AB/Android/gamedata/excel folder and repack them.

[New feature idea] Repack AB files from extracted files

Hello,

Thank you for your tool that allows me to get the AB files already extracted!

Do you think in the future also do the opposite? I mean be able to recreate the AB file from the extracted file?

I have also already tried on my side starting from the skill_table.json file for example to obtain the skill_table.ab again, however I am a beginner in python and I do not know much about AES keys or Unity...

I was able to do this myself:

def text_asset_encrypt(stream, has_rsa: bool = True):
    aes_obj = AES.new(b'UITpAi82pHAWwnzq', AES.MODE_CBC, bytearray(b'{\r\n  "skcom_char'))
    data = stream[128:] if has_rsa else stream
    encrypt_buf = aes_obj.encrypt(pad(data[16:], 16))
    return encrypt_buf

With :
- b'UITpAi82pHAWwnzq' : aes_key (get in decryption function for skill file only)
- bytearray(b'{\r\n "skcom_char') : aes_iv (get in decryption function for skill file only)

However, the reconstructed AB file is not identical to the original AB file...

Here is the code allowing me to try to encrypt the files again:

def pack(file_path_ab: Path, file_path_json: Path):
    # with open(file_path_json, 'rb') as file:
    with open(file_path_json, 'r') as file:
        # Read file data
        data = file.read()
        dataUnserialized = json.dumps(data).encode('utf-8')
        de = text_asset_encrypt(bytes(dataUnserialized))
        # de = text_asset_encrypt(data)

        shutil.copyfile(file_path_ab, file_path_json + '.ab')

        env = UnityPy.load(str(file_path_json + '.ab'))
        for obj in env.objects:
            data = obj.read()
            name = obj.type.name
            if name == 'TextAsset':
                with open(file_path_json + '.abb', 'wb') as f:
                    data.script = de
                    data.save()
                    # print(data.save())
                    f.write(env.file.save())

As you can see I am also trying to use JSON functions however I clearly don't know if my problem comes from the misuse of JSON functions, AES key, pad for key, Unity or somewhere else ...

Thanks in advance for your help,
Best regards,
Nyantasan59