咏月风雅对游戏内的live2d单独进行了加密

讨论
1

资源包内spine和NPC的live2d没有加密，给所有可抽取角色的assetbundle包进行了加密 :roll_eyes:

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QQ截图20240821135557802×422 177 KB

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QQ截图20240821135605786×556 250 KB

2

live2d_ym0055_005501.zip (1.8 MB)

3

又对比了一下一部分的spine也被加密了
开服的包没加密，夏活包改加密了 :cry:

4

单纯的xor加密，key是37, 12, 178, 118, 37, 12, 178, 118, 37, 12, 178, 118, 37, 12, 178, 118，对前0xe0字节xor。

5

不太懂这个啊大佬

7 
import sys

key = [37, 12, 178, 118, 37, 12, 178, 118, 37, 12, 178, 118, 37, 12, 178, 118]

if __name__ == '__main__':
    path = sys.argv[1]
    with open(path, 'rb') as f:
        data = f.read()
    data = bytearray(data)
    for i in range(0xe0):
        data[i] ^= key[i % len(key)]
    with open(f"{path}", 'wb') as f:
        f.write(data)
8

這個遊戲這邊今年6月解過，實際上他每個資料夾內都是不同的xor key。

當時的解密腳本
import os

def xor_decrypt(data, key):
decrypted_data = bytearray()
key_len = len(key)
for i, byte in enumerate(data):
decrypted_data.append(byte ^ key[i % key_len])
return decrypted_data

def process_folder(folder_path):
for root, dirs, files in os.walk(folder_path):
for file in files:
if file.lower().endswith(“.dat”):
file_path = os.path.join(root, file)
with open(file_path, ‘rb’) as file:
unity_data = bytearray(file.read())

            k1 = unity_data[:4]


            key = bytearray.fromhex("55 6E 69 74")
            k2 = xor_decrypt(k1, key)


            decrypted_unity_data = xor_decrypt(unity_data[:220], k2)
    
            new_decrypted_data = decrypted_unity_data + unity_data[220:]

            with open(file_path, 'wb') as file:
                file.write(new_decrypted_data)

            print(f"Decrypted and overwritten {file_path}")

if name == “main”:
folder_path = input("Enter the folder path to process: ")
process_folder(folder_path)

儘管如此，還是有無法加密回去的問題，除非另導出k1,k2與檔名之對應值(也就是密鑰)

更新:2024/11/20:

全部解密長度皆為220，GameList.dat與GameVersion.dat除外,GameList.dat與GameVersion.dat另有加密。

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9

感谢回复