OPPO Kernel Craftsman
Dec 16, 2022 · Information Security
Analysis of OP-TEE SFS Secure Storage Implementation (OPTEE 3.18)
The article examines OP‑TEE 3.18’s SFS secure storage, detailing its GP API, kernel file‑system module, REE daemon interactions, file format with header, hash‑tree nodes, key hierarchy (SSK, TSK, FEK), and encryption using AES‑GCM, and highlights the single‑point‑of‑failure risk of the dirf.db directory.
OP-TEESFSSecure Storage
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