# Changelog
All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## 1.9.0 (2026-06-12)
### Added
- `Zeroizing` is now `repr(transparent)` ([#1253])
- `optimization_barrier` function ([#1261])
- `Zeroizing` now supports `?Sized` ([#1318])
- `zeroize_stack` function ([#1331])

### Changed
- Edition changed to 2024 and MSRV bumped to 1.85 ([#1149])
- Replace `atomic_fence` with `optimization_barrier` ([#1252])
- Bump `zeroize_derive` to v1.5 ([#1492])
- Always enable AVX-512 support ([#1493])

[#1149]: https://github.com/RustCrypto/utils/pull/1149
[#1252]: https://github.com/RustCrypto/utils/pull/1252
[#1253]: https://github.com/RustCrypto/utils/pull/1253
[#1261]: https://github.com/RustCrypto/utils/pull/1261
[#1318]: https://github.com/RustCrypto/utils/pull/1318
[#1331]: https://github.com/RustCrypto/utils/pull/1331
[#1492]: https://github.com/RustCrypto/utils/pull/1492
[#1493]: https://github.com/RustCrypto/utils/pull/1493

## 1.8.2 (2025-09-29)
### Changed
- Switch from `doc_auto_cfg` to `doc_cfg` ([#1228])

[#1228]: https://github.com/RustCrypto/utils/pull/1228

## 1.8.1 (2024-05-25)
### Changed
- Feature-gate AVX-512 support under `simd`; restores MSRV 1.60 ([#1073])

[#1073]: https://github.com/RustCrypto/utils/pull/1073

## 1.8.0 (2024-04-24) [YANKED]

NOTE: yanked due concerns over the MSRV bump. See [#1067].

### Added
- Unsafe `zeroize_flat_type` function ([#1045])
- `Zeroize` impls for `__m512` types on `x86`/`x86_64` targets ([#1052])

### Changed
- Bump MSRV to 1.72 ([#1052])
- Always enable AArch64 support ([#1064])

### Fixed
- Nightly warnings ([#1055])

[#1045]: https://github.com/RustCrypto/utils/pull/1045
[#1052]: https://github.com/RustCrypto/utils/pull/1052
[#1055]: https://github.com/RustCrypto/utils/pull/1055
[#1064]: https://github.com/RustCrypto/utils/pull/1064
[#1067]: https://github.com/RustCrypto/utils/pull/1067

## 1.7.0 (2023-11-16)
### Changed
- Bump MSRV to 1.60 ([#900])

## 1.6.1 (2023-11-15) [YANKED]

NOTE: yanked because [#900] bumped MSRV to 1.60, which vioates our MSRV policy.

### Added
- Impl `Zeroize` for `MaybeUninit` ([#900])

### Removed
- Unnecessary `cfg`s on SIMD type impls ([#930])

[#900]: https://github.com/RustCrypto/utils/pull/900
[#930]: https://github.com/RustCrypto/utils/pull/930

## 1.6.0 (2023-03-26)
### Added
- Impl `Zeroize` for `core::num::Wrapping` ([#818])
- Impl `Zeroize` for `str` and `Box<str>` ([#842])

### Changed
- 2021 edition upgrade; MSRV 1.56 ([#869])

[#818]: https://github.com/RustCrypto/utils/pull/818
[#842]: https://github.com/RustCrypto/utils/pull/842
[#869]: https://github.com/RustCrypto/utils/pull/869

## 1.5.7 (2022-07-20)
### Added
- Optional `serde` support ([#780])

[#780]: https://github.com/RustCrypto/utils/pull/780

## 1.5.6 (2022-06-29)
### Added
- `#[inline(always)]` annotations ([#772])
- `#[ignore]` attribute on flaky CString test ([#776])

### Changed
- Factor integration tests into `tests/` ([#771])

[#771]: https://github.com/RustCrypto/utils/pull/771
[#772]: https://github.com/RustCrypto/utils/pull/772
[#776]: https://github.com/RustCrypto/utils/pull/776

## 1.5.5 (2022-04-30)
### Added
- Impl `Zeroize` for std::ffi::CString ([#759])
- `AsRef<T>` and `AsMut<T>` impls for `Zeroizing` ([#761])

[#759]: https://github.com/RustCrypto/utils/pull/759
[#761]: https://github.com/RustCrypto/utils/pull/761

## 1.5.4 (2022-03-16)
### Added
- Nightly-only support for zeroizing ARM64 SIMD registers ([#749])

[#749]: https://github.com/RustCrypto/utils/pull/749

## 1.5.3 (2022-02-25)
### Fixed
- Deriving `ZeroizeOnDrop` on `DerefMut` ([#739])

[#739]: https://github.com/RustCrypto/utils/pull/739

## 1.5.2 (2022-01-31) [YANKED]
### Fixed
- Ambiguous method for `AssertZeroizeOnDrop` ([#725])

[#725]: https://github.com/RustCrypto/utils/pull/725

## 1.5.1 (2022-01-27) [YANKED]
### Fixed
- Double `mut` on `AssertZeroizeOnDrop` ([#719])

[#719]: https://github.com/RustCrypto/utils/pull/719

## 1.5.0 (2022-01-14) [YANKED]
### Added
- `Zeroize` impls for `PhantomData`, `PhantomPinned`, and tuples with 0-10 elements ([#660])
- `#[zeroize(bound = "T: MyTrait")]` ([#663])
- `ZeroizeOnDrop` trait and custom derive ([#699], [#700], [#703])

[#660]: https://github.com/RustCrypto/utils/pull/660
[#663]: https://github.com/RustCrypto/utils/pull/663
[#699]: https://github.com/RustCrypto/utils/pull/699
[#700]: https://github.com/RustCrypto/utils/pull/700
[#703]: https://github.com/RustCrypto/utils/pull/703

## 1.4.3 (2021-11-04)
### Added
- Implement `Zeroize` for `NonZeroX`

### Changed
- Moved to `RustCrypto/utils` repository

## 1.4.2 (2021-09-21)
### Added
- Derive `Default` on `Zeroizing`

## 1.4.1 (2021-07-20)
### Added
- Implement Zeroize for `[MaybeUninit<Z>]`

## 1.4.0 (2021-07-18)
NOTE: This release includes an MSRV bump to Rust 1.51. Please use `zeroize = "1.3.0"`
if you would like to support older Rust versions.

### Added
- Use const generics to impl `Zeroize` for `[Z; N]`; MSRV 1.51
- `Zeroizing::clone_from` now zeroizes the destination before cloning

## 1.3.0 (2021-04-19)
### Added
- impl `Zeroize` for `Box<[Z]>`
- Clear residual space within `Option`

### Changed
- Ensure `Option` is `None` when zeroized
- Bump MSRV to 1.47

## 1.2.0 (2020-12-09)
### Added
- `Zeroize` support for x86(-64) SIMD registers

### Changed
- Simplify `String::zeroize`
- MSRV 1.44+

## 1.1.1 (2020-09-15)
- Add `doc_cfg`
- zeroize entire capacity of `String`
- zeroize entire capacity of `Vec`

## 1.1.0 (2019-12-02)
- Add `TryZeroize` trait
- Add `From<Z: Zeroize>` impl for `Zeroizing<Z>`
- Remove `bytes-preview` feature

## 1.0.0 (2019-10-13)
- Initial 1.0 release 🎉
- zeroize_derive: Remove legacy `no_drop` attribute support
- Rename `bytes` feature to `bytes-preview`
- Further relax `Zeroize` trait bounds for `Vec`
- Derive `Clone`, `Debug`, and `Eq` for `Zeroizing`

## 1.0.0-pre (2019-09-30)
- Loosen `Vec` trait bounds for `Zeroize`

## 0.10.1 (2019-09-03)
- (Optionally) Impl `Zeroize` for `Bytes` and `BytesMut`

## 0.10.0 (2019-08-19)
Barring unforeseen circumstances, this release aims to be the last `0.x`
release prior to a `zeroize` 1.0 release.

- Disable `zeroize_derive` Cargo feature by default
- Remove `std` feature in favor of `alloc`; MSRV 1.36+
- Deprecate `#[zeroize(no_drop)]` attribute
- Use 1.0 `proc-macro2`, `quote`, and `syn` crates

## 0.9.3 (2019-07-27)
- Improved attribute parser; fixes nightly build

## 0.9.2 (2019-06-28)
- README.md: add Gitter badges; update image links

## 0.9.1 (2019-06-04)
- Impl `Zeroize` for `Option<Z: Zeroize>`

## 0.9.0 (2019-06-04)
**NOTICE**: This release changes the default behavior of `derive(Zeroize)`
to no longer derive a `Drop` impl. If you wish to derive `Drop`, you must
now explicitly add a `#[zeroize(drop)]` attribute on the type for which you
are deriving `Zeroize`.

- Remove CPU fences
- Remove scary language about undefined behavior
- Bound blanket array impls on `Zeroize` instead of `DefaultIsZeroes`
- Require `zeroize(drop)` or `zeroize(no_drop)` attributes when deriving
  `Zeroize` .
- Support stabilized 'alloc' crate

## 0.8.0 (2019-05-20)
- Impl `Drop` by default when deriving `Zeroize`

## 0.7.0 (2019-05-19)
- Use synstructure for custom derive
- Add explicit array impls for `DefaultIsZeroes`
- Remove `nightly` feature
- Add `Zeroizing<Z>` to zeroize values on drop

## 0.6.0 (2019-03-23)
- Add ZeroizeOnDrop marker trait + custom derive
- Custom derive support for `Zeroize`
- Rename `ZeroizeWithDefault` to `DefaultIsZeroes`

## 0.5.2 (2018-12-25)
- Add `debug_assert!` to ensure string interiors are zeroized

## 0.5.1 (2018-12-24)
- Avoid re-exporting the whole prelude

## 0.5.0 (2018-12-24)
This release is a rewrite which replaces FFI bindings to OS-specific APIs with
a pure Rust solution.

- Use `core::sync::atomic` fences
- Test wasm target
- Rewrite using `core::ptr::write_volatile`

## 0.4.2 (2018-10-12)
- Fix ldd scraper for older glibc versions

## 0.4.1 (2018-10-12)
- Support musl-libc

## 0.4.0 (2018-10-12)
- Impl `Zeroize` trait on concrete types

## 0.3.0 (2018-10-11)
- Replace `secure_zero_memory` with `Zeroize`

## 0.2.0 (2018-10-11)
- Add `Zeroize` trait

## 0.1.2 (2018-10-03)
- README.md: Fix intrinsic links

## 0.1.1 (2018-10-03)
- Documentation improvements

## 0.1.0 (2018-10-03)
- Initial release
