sloth256-189 0.2.0

Encoder/decoder for the Subspace Network Blockchain based on the SLOTH permutation
Documentation 
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<div align="center">
  <h1><code>sloth256-189</code></h1>
  <strong>Encoder/decoder for the <a href="https://subspace.network/">Subspace Network Blockchain</a> based on the <a href="https://eprint.iacr.org/2015/366">SLOTH permutation</a></strong>
</div>

[![CI](https://github.com/subspace/sloth256-189/actions/workflows/ci.yaml/badge.svg)](https://github.com/subspace/sloth256-189/actions/workflows/ci.yaml)
[![Crates.io](https://img.shields.io/crates/v/sloth256-189)](https://crates.io/crates/sloth256-189)
[![Docs](https://img.shields.io/badge/docs-latest-blue.svg)](https://docs.rs/sloth256-189)

This is an adaptation of [SLOTH](https://eprint.iacr.org/2015/366) (slow-timed hash function) into a time-asymmetric
permutation using a standard CBC block cipher.

Implementation contains 3 flavors:
* optimized assembly-assisted implementation for x86-64 processors with ADX ISA extension (Linux, macOS and Windows)
* any 64-bt platform with support for `__int128` C type (modern GCC/Clang, but not MSVC)
* fallback for other platforms

### License

Licensed under either of

- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
  https://www.apache.org/licenses/LICENSE-2.0)
- MIT license ([LICENSE-MIT](LICENSE-MIT) or
  https://opensource.org/licenses/MIT)

at your option.

### Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in cc-rs by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.