### Pubky Noise Quick Start Example Source: https://github.com/pubky/pubky-noise/blob/master/pubky-noise/README.md Demonstrates the quick start process for setting up and using Pubky Noise for encrypted messaging. This includes configuration, handshake, and message transport phases. ```rust use std::sync::Arc; use pubky::prelude::*; use pubky_noise::{PubkyNoiseConfig, PubkyNoiseEncryptor, HandshakeResult}; // 1. Create shared configuration // (requires an authenticated PubkySession and a Pubky HTTP client) let config = PubkyNoiseConfig::new( root_secret_key, // [u8; 32] - root Ed25519 secret key 0, // protocol version "XX", // Noise handshake pattern homeserver_session, // authenticated PubkySession "/pub/data".to_string(), // storage path prefix pubky_client, // Pubky HTTP client ).unwrap(); // 2. Create encryptors for each side let mut initiator = PubkyNoiseEncryptor::new( config.clone(), ephemeral_secret_key, // [u8; 32] - per-session key true, // initiator = true responder_public_key, // remote peer's PublicKey ).unwrap(); // 3. Run the handshake (polling-safe, call repeatedly) loop { match initiator.handle_handshake().await.unwrap() { HandshakeResult::Pending => { /* poll again later */ }, HandshakeResult::Terminal => break, } } // 4. Transition to transport phase let link_id = initiator.transition_transport().unwrap(); // 5. Send and receive encrypted messages initiator.send_message(b"Hello, peer!").await?; let messages = initiator.receive_message().await?; // 6. Clean up initiator.close(); ``` -------------------------------- ### Build Project with Cargo Source: https://github.com/pubky/pubky-noise/blob/master/README.md Standard command to build the Rust workspace. Ensure you have Rust and Cargo installed. ```sh cargo build ``` -------------------------------- ### Run Unit Tests with Cargo Source: https://github.com/pubky/pubky-noise/blob/master/README.md Execute unit tests for the 'pubky-noise' crate. This command focuses on path derivation and serialization tests. ```sh cargo nextest -p pubky-noise ``` -------------------------------- ### Serialize and Restore Pubky Noise Session State Source: https://github.com/pubky/pubky-noise/blob/master/pubky-noise/README.md Demonstrates taking a snapshot of the current session state, serializing it to bytes, and then restoring a session from these bytes after a failure. This is useful for recovering from crashes or write failures. ```rust let snapshot = encryptor.snapshot(); let bytes = snapshot.serialize(); // ... persist bytes to storage ... let state = PubkyNoiseSessionState::deserialize(&bytes).unwrap(); let mut restored = PubkyEncryptor::restore(config, state, endpoint_pubkey).await.unwrap(); // Continue from where you left off ``` -------------------------------- ### Add pubky-noise to Cargo.toml Source: https://github.com/pubky/pubky-noise/blob/master/pubky-noise/README.md Add the pubky-noise crate to your project's dependencies in Cargo.toml. ```toml # Cargo.toml [dependencies] pubky-noise = "0.1.0-rc5" ``` -------------------------------- ### Run End-to-End Tests with Cargo Source: https://github.com/pubky/pubky-noise/blob/master/README.md Execute end-to-end tests for the 'e2e' crate, which requires an embedded PostgreSQL database. These tests cover the full communication lifecycle. ```sh cargo nextest -p e2e ``` -------------------------------- ### Rust Crash Recovery for Pubky Noise Handshake Source: https://github.com/pubky/pubky-noise/blob/master/pubky-noise/README.md This Rust code demonstrates how to implement crash recovery for the Pubky Noise handshake. It persists the last good snapshot after each successful handshake and restores the encryptor from this snapshot if a HomeserverWriteError occurs, allowing the handshake to be retried. ```rust use pubky_noise::{PubkyNoiseEncryptor, PubkyNoiseConfig, PubkyNoiseError, HandshakeResult}; use pubky_noise::serializer::PubkyNoiseSessionState; // Persist the last good snapshot after every handshake call. // This is the safety net for crash recovery. async fn handshake_with_recovery( encryptor: &mut PubkyNoiseEncryptor, config: Arc, endpoint_pubkey: PublicKey, ) -> Result { match encryptor.handle_handshake().await { Ok(result) => { // Success -- persist the pre-mutation snapshot for future recovery. // (Each call overwrites the previous snapshot, so persist after every call.) if let Some(snapshot) = encryptor.last_good_snapshot() { let bytes = snapshot.serialize(); save_to_disk(&bytes); // your persistence logic } Ok(result) } Err(PubkyNoiseError::HomeserverWriteError) => { // The encryptor is now corrupted. Recover from the snapshot // that was captured at the START of this failed call. let snapshot = encryptor .last_good_snapshot() .expect("always Some after handle_handshake") .clone(); let bytes = snapshot.serialize(); let state = PubkyNoiseSessionState::deserialize(&bytes).unwrap(); // Restore rebuilds the Noise state by replaying handshake // messages that are actually on the homeservers. *encryptor = PubkyNoiseEncryptor::restore( config, state, endpoint_pubkey, ) .await?; // The restored encryptor is back to the pre-failure position. // The caller can retry handle_handshake() on the next poll. Ok(HandshakeResult::Pending) } Err(e) => Err(e), } } ``` -------------------------------- ### Derive Asymmetric Paths for Privacy Source: https://github.com/pubky/pubky-noise/blob/master/pubky-noise/README.md Use `derive_asymmetric_paths` to compute unique write and read paths from a Diffie-Hellman shared secret. This function requires your secret key, the peer's public key, a domain separation string, and a base path. The generated paths are guaranteed to be correctly mapped between peers due to DH commutativity. ```rust use pubky_noise::path_derivation::derive_asymmetric_paths; let (write_path, read_path) = derive_asymmetric_paths( &my_secret_key, &their_pubkey, b"paykit-path-v0", // domain separation "/pub/paykit.app/v0/private", // base path ); // write_path = "/pub/paykit.app/v0/private/a1b2c3d4...64 hex chars" // read_path = "/pub/paykit.app/v0/private/e5f6a7b8...64 hex chars" ``` -------------------------------- ### Noise Protocol Name Source: https://github.com/pubky/pubky-noise/blob/master/pubky-noise/README.md Specifies the Noise protocol name used, including the pattern, key exchange, stream cipher, and hash algorithm. ```text Noise_{pattern}_25519_ChaChaPoly_SHA256 ``` === COMPLETE CONTENT === This response contains all available snippets from this library. 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