A Windows CLI program for decrypting, decompressing, re-encrypting and re-compressing DataTable JSON files used by Taiko no Tatsujin for the Nintendo Switch (and possibly others) intended for Game Modding.
DataTable .bin files (located under LayeredFS/romfs/datatable) are zlib Deflate compressed and (in later game versions) AES-128-CBC encrypted JSON files used for defining various game parameters. The exact encryption key used appears to change with every game update/region but can be easily extracted using a disassembler from the target executable.
Encryption keys for each region+version are defined inside TaikoSwitchDataTableEncrpytionKeys.ini and will have to be updated in the future to support newer (or older) versions.
Attempting to decrypt or re-encrypt a DataTable file from an undefined game version will fail.
TaikoSwitchDataTableDecryptor.exe "{input_datatable_file}.bin"
resulting in an output file {input_file_directory}/{input_datatable_file} {key_name}.json
where {input_datatable_file} is a file path to a DataTable file and {key_name} is the name of the automatically detected key used for decryption.
If the input file is not encrypted (as is the case for older game versions) then a key name will not be appended.
TaikoSwitchDataTableDecryptor.exe "{input_datatable_file} {key_name}.json
resulting in an output file {input_file_directory}/{input_datatable_file}.bin
where {key_name} is the same name of the key used for re-encrpytion.
If no matching key name is found for the input file name then the resulting JSON file will not be encrypted.
TaikoSwitchDataTableDecryptor.exe "musicinfo.bin"->musicinfo.jsonTaikoSwitchDataTableDecryptor.exe "musicinfo.json"->musicinfo.bin
TaikoSwitchDataTableDecryptor.exe "musicinfo.bin"->musicinfo jp_ver143.jsonTaikoSwitchDataTableDecryptor.exe "musicinfo jp_ver143.json"->musicinfo.bin
This interface design is intentionally simplistic to support Windows Explorer drag-and-drop style conversion without the need to manually enter commands into a command prompt.
This program is licensed under the MIT License and embeds a copy of the source code for the zlib library by Jean-loup Gailly and Mark Adler.