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# [RustCrypto]: Constant-Time Base16 (hexadecimal)
[![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]
Pure Rust implementation of Base16 ([RFC 4648]).
Implements lower and upper case Base16 variants without data-dependent branches
or lookup tables, thereby providing portable "best effort" constant-time
operation.
Supports `no_std` environments and avoids heap allocations in the core API
(but also provides optional `alloc` support for convenience).
[Documentation][docs-link]
## Minimum Supported Rust Version
This crate requires **Rust 1.56** at a minimum.
We may change the MSRV in the future, but it will be accompanied by 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/base16ct.svg
[crate-link]: https://crates.io/crates/base16ct
[docs-image]: https://docs.rs/base16ct/badge.svg
[docs-link]: https://docs.rs/base16ct/
[build-image]: https://github.com/RustCrypto/formats/actions/workflows/base16ct.yml/badge.svg
[build-link]: https://github.com/RustCrypto/formats/actions/workflows/base16ct.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/300570-formats
[//]: # (links)
[RustCrypto]: https://github.com/rustcrypto
[RFC 4648]: https://tools.ietf.org/html/rfc4648
[Util::Lookup]: https://arxiv.org/pdf/2108.04600.pdf
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