# RustCrypto: SHA-1
[![crate][crate-image]][crate-link]
[![Docs][docs-image]][docs-link]
![Apache2/MIT licensed][license-image]
![Rust Version][rustc-image]
[![Project Chat][chat-image]][chat-link]
[![Build Status][build-image]][build-link]
Pure Rust implementation of the [SHA-1 hash function][1].
[Documentation][docs-link]
## 🚨 Warning: Cryptographically Broken 🚨
The SHA-1 hash function should be considered cryptographically broken and
unsuitable for further use in any security critical capacity, as it is
[practically vulnerable to chosen-prefix collisions][2].
We provide this crate for legacy interoperability purposes only.
## Minimum Supported Rust Version
Rust **1.41** or higher.
Minimum supported Rust version can be changed in the future, but it will be
done with a minor version bump.
## SemVer Policy
- All on-by-default features of this library are covered by SemVer
- MSRV is considered exempt from SemVer as noted above
## License
Licensed under either of:
* [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
* [MIT license](http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.
[//]: # (badges)
[crate-image]: https://img.shields.io/crates/v/sha1.svg
[crate-link]: https://crates.io/crates/sha1
[docs-image]: https://docs.rs/sha1/badge.svg
[docs-link]: https://docs.rs/sha1/
[license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
[rustc-image]: https://img.shields.io/badge/rustc-1.41+-blue.svg
[chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
[chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/260041-hashes
[build-image]: https://github.com/RustCrypto/hashes/workflows/sha1/badge.svg?branch=master
[build-link]: https://github.com/RustCrypto/hashes/actions?query=workflow%3Asha1
[//]: # (general links)
[1]: https://en.wikipedia.org/wiki/SHA-1
[2]: https://sha-mbles.github.io/