# [RustCrypto]: Digital Signature Algorithms

[![crate][crate-image]][crate-link]
[![Docs][docs-image]][docs-link]
[![Build Status][build-image]][build-link]
![Apache2/MIT licensed][license-image]
![Rust Version][rustc-image]
[![Project Chat][chat-image]][chat-link]

This crate contains traits which provide generic, object-safe APIs for
generating and verifying [digital signatures].

Used by the [`dsa`], [`ecdsa`], [`ed25519`], and [`rsa`] crates maintained by
the [RustCrypto] organization, as well as [`ed25519-dalek`].

[Documentation][docs-link]

## Minimum Supported Rust Version

Rust **1.56** 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
- The `derive` feature is stable and covered by SemVer
- The off-by-default features `digest` and `rand_core` are unstable features 
  which are also considered exempt from SemVer as they correspond to pre-1.0
  crates which are still subject to changes. Breaking changes to these features
  will, like MSRV, be done with a minor version bump.

## 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://buildstats.info/crate/signature
[crate-link]: https://crates.io/crates/signature
[docs-image]: https://docs.rs/signature/badge.svg
[docs-link]: https://docs.rs/signature/
[build-image]: https://github.com/RustCrypto/traits/actions/workflows/signature.yml/badge.svg
[build-link]: https://github.com/RustCrypto/traits/actions/workflows/signature.yml
[license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
[rustc-image]: https://img.shields.io/badge/rustc-1.56+-blue.svg
[chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
[chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/260048-signatures

[//]: # (links)

[RustCrypto]: https://github.com/RustCrypto/
[digital signatures]: https://en.wikipedia.org/wiki/Digital_signature
[`dsa`]: https://github.com/RustCrypto/signatures/tree/master/dsa
[`ecdsa`]: https://github.com/RustCrypto/signatures/tree/master/ecdsa
[`ed25519`]: https://github.com/RustCrypto/signatures/tree/master/ed25519
[`ed25519-dalek`]: https://github.com/dalek-cryptography/ed25519-dalek
[`rsa`]: https://github.com/RustCrypto/RSA