// Copyright 2020-2021 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0

#![allow(clippy::upper_case_acronyms)]

//! This crate defines and implements the encrypted offline storage format used by
//! the Stronghold ecosystem.
//!
//! The format has a header with version and magic bytes to appease applications
//! wishing to provide file-type detection.
//!
//! The data stored within a snapshot is considered opaque and uses 256 bit keys.
//! It provides recommended ways to derive the snapshot encryption key from a user
//! provided password. The format also allows using an authenticated data
//! bytestring to further protect the offline snapshot files (one might consider
//! using a secondary user password strengthened by an HSM).
//!
//! The current version of the format is using X25519 together with an ephemeral
//! key to derive a shared key for the symmetric XChaCha20 cipher and uses the
//! Poly1305 message authentication algorithm.

//! Future versions, when the demands for larger snapshot sizes and/or random
//! access is desired, might consider encrypting smaller chunks (B-trees?) or
//! similar using per chunk derived ephemeral keys.

mod compression;
pub mod files;
pub mod kdf;

mod logic;
pub use compression::{compress, decompress};
pub use logic::*;