# [RustCrypto]: X.509 Subject Public Key Info (SPKI)
[![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]
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[X.509] Subject Public Key Info types describing public keys as well as their
associated `AlgorithmIdentifier`s (i.e. OIDs).
Specified in [RFC 5280 § 4.1].
[Documentation][docs-link]
## Minimum Supported Rust Version (MSRV) Policy
MSRV increases are not considered breaking changes and can happen in patch
releases.
The crate MSRV accounts for all supported targets and crate feature
combinations, excluding explicitly unstable features.
## 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/spki
[crate-link]: https://crates.io/crates/spki
[docs-image]: https://docs.rs/spki/badge.svg
[docs-link]: https://docs.rs/spki/
[build-image]: https://github.com/RustCrypto/formats/actions/workflows/spki.yml/badge.svg
[build-link]: https://github.com/RustCrypto/formats/actions/workflows/spki.yml
[license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
[rustc-image]: https://img.shields.io/badge/rustc-1.85+-blue.svg
[chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
[chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/300570-formats
[//]: # (links)
[RustCrypto]: https://github.com/rustcrypto
[X.509]: https://en.wikipedia.org/wiki/X.509
[RFC 5280 § 4.1]: https://tools.ietf.org/html/rfc5280#section-4.1