# RustCrypto: Password Hashing Traits

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[![Docs][docs-image]][docs-link]
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![Apache2/MIT licensed][license-image]
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Traits which describe the functionality of [password hashing algorithms].

[Documentation][docs-link]

## About

Provides a `no_std`-friendly implementation of the
[Password Hashing Competition (PHC) string format specification][PHC]
(a well-defined subset of the [Modular Crypt Format a.k.a. MCF][MCF]) which
works in conjunction with the traits this crate defines.

## Supported Crates

See [RustCrypto/password-hashes] for algorithm implementations which use
this crate for interoperability:

- [`argon2`] - Argon2 memory hard key derivation function
- [`pbkdf2`] - Password-Based Key Derivation Function v2
- [`scrypt`] - scrypt key derivation function

## Minimum Supported Rust Version

Rust **1.60** or higher.

Minimum supported Rust version may be changed in the future, but it will be
accompanied by a minor version bump.

## SemVer Policy

- All on-by-default features of this library are covered by SemVer
- MSRV is considered exempt from SemVer as noted above

## License

Licensed under either of:

- [Apache License, Version 2.0](https://www.apache.org/licenses/LICENSE-2.0)
- [MIT license](https://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/password-hash
[crate-link]: https://crates.io/crates/password-hash
[docs-image]: https://docs.rs/password-hash/badge.svg
[docs-link]: https://docs.rs/password-hash/
[build-image]: https://github.com/RustCrypto/traits/workflows/password-hash/badge.svg?branch=master&event=push
[build-link]: https://github.com/RustCrypto/traits/actions?query=workflow:password-hash
[license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
[rustc-image]: https://img.shields.io/badge/rustc-1.60+-blue.svg
[chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
[chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/260046-password-hashes

[//]: # (general links)

[password hashing algorithms]: https://en.wikipedia.org/wiki/Cryptographic_hash_function#Password_verification
[PHC]: https://github.com/P-H-C/phc-string-format/blob/master/phc-sf-spec.md
[MCF]: https://passlib.readthedocs.io/en/stable/modular_crypt_format.html
[RustCrypto/password-hashes]: https://github.com/RustCrypto/password-hashes
[`argon2`]: https://docs.rs/argon2
[`pbkdf2`]: https://docs.rs/pbkdf2
[`scrypt`]: https://docs.rs/scrypt