UnityCN-Helper

A tool helps decrypt/encrypt assetbundle files for UnityCN.

Command Line Arguments

• -i, --infile Required. Input file to be processed.

• -o, --outfile Required. Output processed file.

• -u, --unitycn (Default: ) Backup unitycn info file.You can use original encrypted asset file instead when encrypting.

• -e, --encrypt (Default: false) Encrypt the asset file.

• -d, --decrypt (Default: false) Decrypt the asset file.

• -k, --key Required. UnityCN key for decryption.

• --help Display this help screen.

• --version Display version information.

Example

decrypt test.asset to test.asset.de with test.cn and 5265736F6E616E63655265626F726E52 key.

./UnityCN-Helper -i test.asset -o test.asset.de -u test.cn -k 5265736F6E616E63655265626F726E52 -d

after modify test.asset.de, encrypt it to test.asset with test.cn and 5265736F6E616E63655265626F726E52 key.

./UnityCN-Helper -i test.asset.de -o test.asset -u test.cn -k 5265736F6E616E63655265626F726E52 -e

If you don't want save UnityCN info file, you can use original encrypted asset file instead.

./UnityCN-Helper -i test.asset -o test.asset.de -k 5265736F6E616E63655265626F726E52 -d
./UnityCN-Helper -i test.asset.de -o test.asset -u test.asset -k 5265736F6E616E63655265626F726E52 -e

You need to know

In fact, after modifying the asset file, encrypting is not necessary.

For games I encountered, the game can load unencrypted asset files as well as encrypted asset files.

Special Thanks

• Perfare for creating and maintaining and every contributor of AssetStudio

• Razmoth for figuring out and sharing Unity CN's AssetBundle decryption (src).