secret-manager 0.1.2

A distributed secret rotation and management library
Documentation

secret-manager

Crates.io docs.rs codecov

Distributed secret-key rotation and in-process caching for Rust services.

Overview

secret-manager manages a ring buffer of versioned encryption keys shared across a cluster. Keys are generated, encrypted, and persisted by a rotator; they are fetched, decrypted, and cached in memory by a syncer. The two roles are intentionally decoupled so you can deploy them in whatever topology fits your system.

Features

  • Key rotation — periodic key generation with optimistic-locking so multiple instances converge safely
  • In-process ring buffer — O(1) lookup by version, lock-free reads via atomics
  • Pluggable backends — bring your own storage; built-in PostgreSQL backends via Diesel or SQLx
  • Pluggable encryptors — NoOpEncryptor, LocalEncryptor (AES-256-GCM-SIV), or KmsEncryptor (AWS KMS)
  • Graceful shutdown — CancellationToken-based, with SecretManagerHandle::wait() to drain tasks cleanly

Usage

Add to Cargo.toml:

[dependencies]
secret-manager = { version = "0.1", features = ["pg-sqlx"] }

Available features:

Feature Description
pg-sqlx PostgreSQL backend using SQLx
pg-diesel-async PostgreSQL backend using Diesel (async)
aws-kms AWS KMS encryptor
arc-swap Use arc-swap::ArcSwap for the ring buffer — wait-free reads, best under read-heavy workloads
parking-lot Use parking_lot::RwLock instead of std::sync::RwLock — faster lock, no poison handling; ignored when arc-swap is also enabled

By default InMemorySecretGroup uses std::sync::RwLock. Enable arc-swap for the lowest read latency (reads never block), or parking-lot for a lighter-weight lock without the overhead of poison checking.

See the crate documentation for full usage examples covering SecretManager, KeyRotator, and SecretSyncer.

License

Licensed under MIT or Apache-2.0, at your option.