Crate concat_kdf

An implementation of Concat KDF, the Concatenation Key Derivation Function.

This function is described in the section 5.8.1 of NIST SP 800-56A, Recommendation for Pair-Wise Key Establishment Schemes Using Discrete Logarithm Cryptography.

Usage

The most common way to use Concat KDF 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.

let mut key = [0u8; 32];
concat_kdf::derive_key_into::<sha2::Sha256>(b"shared-secret", b"other-info", &mut key).unwrap();

Enums

Error

Concat KDF errors.

Functions

derive_keystd

Derives and returns length bytes key from secret and other_info.

derive_key_into

Derives key in-place from secret and other_info.