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# [RustCrypto]: Cryptographic Big Integers
[![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 a big integer library which has been designed from
the ground-up for use in cryptographic applications.
Provides constant-time, `no_std`-friendly implementations of modern formulas
using const generics.
[Documentation][docs-link]
## Goals
- No heap allocations. `no_std`-friendly.
- Constant-time by default. Variable-time functions are explicitly marked as such.
- Leverage what is possible today with const generics on `stable` rust.
- Support `const fn` as much as possible, including decoding big integers from
bytes/hex and performing arithmetic operations on them, with the goal of
being able to compute values at compile-time.
## 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
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/crypto-bigint
[crate-link]: https://crates.io/crates/crypto-bigint
[docs-image]: https://docs.rs/crypto-bigint/badge.svg
[docs-link]: https://docs.rs/crypto-bigint/
[build-image]: https://github.com/RustCrypto/crypto-bigint/actions/workflows/crypto-bigint.yml/badge.svg
[build-link]: https://github.com/RustCrypto/crypto-bigint/actions/workflows/crypto-bigint.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/300602-crypto-bigint
[//]: # (links)
[RustCrypto]: https://github.com/rustcrypto
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