RustCrypto: KBKDF

Pure Rust implementation of the Key Based Key Derivation Function (KBKDF). This function is described in section 4 of NIST SP 800-108r1, Recommendation for Key Derivation Using Pseudorandom Functions.

Usage

The most common way to use KBKDF is as follows: you generate a shared secret with other party (e.g. via Diffie-Hellman algorithm) and use key derivation function to derive a shared key.

use hex_literal::hex;
use hmac::Hmac;
use kbkdf::{Counter, Kbkdf, Params};
use sha2::Sha256;

type HmacSha256 = Hmac<Sha256>;
let counter = Counter::<HmacSha256, HmacSha256>::default();
let key = counter
    .derive(Params::builder(b"secret").with_label(b"label").build())
    .unwrap();
assert_eq!(
    key,
    hex!(
        "ff6a1e505e0f2546eae8f1e11ab95ff6"
        "47b78bb2182a835c7c1f8054ae7cfea5"
        "8182da6b978c411fa840326ebbe07bfc"
        "aaef01c090bb6f8e9c1da9dedf40bc3e"
    )
);

Minimum Supported Rust Version

Rust 1.81 or higher.

Minimum supported Rust version can be changed in the future, but it will be done with 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
• MIT license

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.