# RustCrypto: Digital Signature Algorithms
[![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]
This crate contains traits which provide generic, object-safe APIs for
generating and verifying [digital signatures][1].
Used by the [`ecdsa`][2] and [`ed25519`][3] crates, with forthcoming support
in the [`rsa`][4] crate.
See also the [Signatory][5] project for trait wrappers for using these traits
with many popular Rust cryptography crates, including `ed25519-dalek`, *ring*,
`secp256k1-rs`, and `sodiumoxide`.
[Documentation][docs-link]
## 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
- The off-by-default features `derive-preview` and `digest-preview` are
unstable "preview" features which are also considered exempt from SemVer.
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://img.shields.io/crates/v/signature.svg
[crate-link]: https://crates.io/crates/signature
[docs-image]: https://docs.rs/signature/badge.svg
[docs-link]: https://docs.rs/signature/
[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/260048-signatures
[build-image]: https://github.com/RustCrypto/traits/workflows/signature/badge.svg?branch=master&event=push
[build-link]: https://github.com/RustCrypto/traits/actions?query=workflow%3Asignature
[//]: # (general links)
[1]: https://en.wikipedia.org/wiki/Digital_signature
[2]: https://github.com/RustCrypto/signatures/tree/master/ecdsa
[3]: https://github.com/RustCrypto/signatures/tree/master/ed25519
[4]: https://github.com/RustCrypto/RSA
[5]: https://docs.rs/signatory