Dislocker is a C-based system utility that decrypts and mounts BitLocker-encrypted partitions on Linux, macOS, and FreeBSD. It provides read/write access to BitLocker volumes (Vista/7/8/8.1/10) via FUSE (virtual NTFS mount) or flat-file decryption. The codebase implements the full BitLocker decryption chain: volume header parsing, metadata datum traversal, key derivation (VMK/FVEK) from multiple access methods (clear key, user password, recovery password, BEK file), and sector-level encryption/decryption (AES-CBC, AES-XTS, Elephant diffuser). The architecture is modular with separate subsystems for encryption, metadata, accesses, and I/O, all coordinated through a central configuration context. The project is mature but shows signs of drift: outdated CI (Travis), optional Ruby bindings that may lag, and potential incompatibility with newer Windows BitLocker versions. Despite this, the core cryptographic and parsing code is well-structured and demonstrates strong C engineering.