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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