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# [RustCrypto]: ECDSA
[![crate][crate-image]][crate-link]
[![Docs][docs-image]][docs-link]
[![Build Status][build-image]][build-link]
![Apache2/MIT licensed][license-image]
![MSRV][rustc-image]
[![Project Chat][chat-image]][chat-link]
[Elliptic Curve Digital Signature Algorithm (ECDSA)][1] as specified in
[FIPS 186-4][2] (Digital Signature Standard).
[Documentation][docs-link]
## About
This crate provides generic ECDSA support which can be used in the following
ways:
- Generic implementation of ECDSA usable with the following crates:
- [`k256`] (secp256k1)
- [`p256`] (NIST P-256)
- [`p384`] (NIST P-384)
- Other crates which provide their own complete implementations of ECDSA can
also leverage the types from this crate to export ECDSA functionality in a
generic, interoperable way by leveraging [`ecdsa::Signature`] with the
[`signature::Signer`] and [`signature::Verifier`] traits.
## ⚠️ Security Warning
The ECDSA implementation contained in this crate has never been independently
audited for security!
This crate contains a generic implementation of ECDSA which must be
instantiated using a separate crate providing a concrete implementation of
arithmetic for a particular curve. It's possible timing variability can exist
in concrete curve implementations, and thus this crate's security can only be
properly assessed for a specific elliptic curve.
USE AT YOUR OWN RISK!
## Minimum Supported Rust Version
This crate requires **Rust 1.65** at a minimum.
We may change the MSRV in the future, but it will be accompanied by a minor
version bump.
## License
All crates 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/ecdsa
[crate-link]: https://crates.io/crates/ecdsa
[docs-image]: https://docs.rs/ecdsa/badge.svg
[docs-link]: https://docs.rs/ecdsa/
[build-image]: https://github.com/RustCrypto/signatures/actions/workflows/ecdsa.yml/badge.svg
[build-link]: https://github.com/RustCrypto/signatures/actions/workflows/ecdsa.yml
[license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
[rustc-image]: https://img.shields.io/badge/rustc-1.65+-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
[//]: # (footnotes)
[1]: https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm
[2]: https://csrc.nist.gov/publications/detail/fips/186/4/final
[//]: # (docs.rs definitions)
[`ecdsa::Signature`]: https://docs.rs/ecdsa/latest/ecdsa/struct.Signature.html
[`k256`]: https://docs.rs/k256
[`p256`]: https://docs.rs/p256
[`p384`]: https://docs.rs/p384
[`signature::Signer`]: https://docs.rs/signature/latest/signature/trait.Signer.html
[`signature::Verifier`]: https://docs.rs/signature/latest/signature/trait.Verifier.html
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