Breaking Changes

• Update edition to 2024
• Update the MSRV from 1.60 to 1.85
• Remove Zeroize impl for x25519::{EphemeralSecret, ReusableSecret, SharedSecret, StaticSecret} to prevent misuse. These are now only zeroized on drop. (#782)
• Remove alloc feature flag, which was doing nothing (#857)
• Remove deprecated functions {Ephemeral,Reusable,Static}Secret::new() (#778)
• Upgrade rand_core dependency to v0.10.0

Other Changes

• Re-export rand_core (#908)

2.x Series

• Note: All x255919-dalek 2.x releases are in sync with the underlying curve25519-dalek 4.x releases.

• Fix nightly SIMD build

• StaticSecret serialization and to_bytes() no longer returns clamped integers. Clamping is still always done during scalar-point multiplication.
• Update underlying curve25519_dalek library to 4.0.0-rc.3. Notable changes:
  • [curve25519-dalek backend] now by default auto selects simd backend over serial where supported.

• Update MSRV to 1.60.
• Update edition to 2021
• Add .as_bytes() and AsRef<[u8]> for Shared/StaticSecret
• Add getrandom feature to provide random_from_rng constructors
• Make StaticSecrets optional via feature static_secrets
• Update underlying curve25519_dalek library to 4.0.0-rc.2. Notable changes:
  • [curve25519-dalek backend] additive features have been removed in favor of cfg based selection.
  • [curve25519-dalek backend] now by default auto selects the appropriate word size over the previous default 32.

• Loosen restriction on zeroize dependency version from =1.3 to 1.
• Update MSRV to 1.51.

• Update rand_core dependency to 0.6.

1.x Series

• Fix a typo in the README.

• Add impls of PartialEq, Eq, and Hash for PublicKey (by @jack-michaud)

• Update underlying curve25519_dalek library to 3.0.

• Widen generic bound on EphemeralSecret::new and StaticSecret::new to allow owned as well as borrowed RNGs.
• Add PublicKey::to_bytes and SharedSecret::to_bytes, returning owned byte arrays, complementing the existing as_bytes methods returning references.
• Remove mention of deprecated rand_os crate from examples.
• Clarify EphemeralSecret/StaticSecret distinction in documentation.

Pre-1.0.0

• Updates rand_core version to 0.5.
• Adds serde support.
• Replaces clear_on_drop with zeroize.
• Use Rust 2018.

• Implement Clone for StaticSecret.

• Implement Copy, Clone, Debug for PublicKey.
• Remove doctests.

• Adds support for static and ephemeral keys.