x25519-dalek 2.0.1

X25519 elliptic curve Diffie-Hellman key exchange in pure-Rust, using curve25519-dalek.
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# Changelog

Entries are listed in reverse chronological order.

# 2.x Series

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

## 2.0.1

* Fix nightly SIMD build

## 2.0.0-rc.3

* `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.


## 2.0.0-rc.2

* 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`.

## 2.0.0-pre.1

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

## 2.0.0-pre.0

* Update `rand_core` dependency to `0.6`.

# 1.x Series

## 1.2

* Add module documentation for using the bytes-oriented `x25519()` API.
* Add implementation of `zeroize::Zeroize` for `PublicKey`.
* Move unittests to a separate directory.
* Add cargo feature flags `"fiat_u32_backend"` and `"fiat_u64_backend"` for
  activating the Fiat crypto field element implementations.
* Fix issue with removed `feature(external_doc)` on nightly compilers.
* Pin `zeroize` to version 1.3 to support a wider range of MSRVs.
* Add CI via Github actions.
* Fix breakage in the serde unittests.
* MSRV is now 1.41 for production and 1.48 for development.
* Add an optional check to `SharedSecret` for contibutory behaviour.
* Add implementation of `ReusableSecret` keys which are non-ephemeral, but which
  cannot be serialised to discourage long-term use.

## 1.1.1

* Fix a typo in the README.

## 1.1.0

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

## 1.0.1

* Update underlying `curve25519_dalek` library to `3.0`.

## 1.0.0

* 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

## 0.6.0

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

## 0.5.2

* Implement `Clone` for `StaticSecret`.

## 0.5.1

* Implement `Copy, Clone, Debug` for `PublicKey`.
* Remove doctests.

## 0.5.0

* Adds support for static and ephemeral keys.

[curve25519-dalek backend]: https://github.com/dalek-cryptography/curve25519-dalek/#backends