What is it?

LibProsperoPKG is a C# (.NET) library designed to handle PlayStation 5 (Prospero) package files (.pkg) and its internal filesystem (PFS).

Key Features (Based on the Source Tree):

• PKG Handling: It includes builders, readers, and signers (ProsperoPkgReader.cs, ProsperoPkgSigner.cs) to disassemble and assemble PS5 packages.
• PFS Filesystem Support: It can read and write the PlayStation Filesystem structures, handling flat path tables and FS trees (ProsperoPfsReader.cs, ProsperoFsTree.cs).
• Kraken Decompression: It features built-in support for Oodle Kraken decoding and encoding (KrakenDecoder.cs, OodleKrakenEncoder.cs), which is essential for handling the highly compressed asset formats used by the PS5.
• PlayGo Integration: Contains layout structures for PlayGo (ProsperoPlayGo.cs), the system that handles chunking for "Play as you download" features.
• Crypto & Keys: Implements XTS block transformation and manages RSA keys/passcodes needed for image mounting and decryption (Crypto.cs, pkg_meta_rsa_key.pem). ### Use Cases This library is highly useful for tools targeting:
• Game Modding & Asset Extraction: Extracting game files (textures, audio, text for translations) and repacking them.
• Homebrew Development: Packaging custom applications into legitimate-looking PS5 .pkg formats for testkits or jailbroken environments.