Struct ConcatenationCombiner 

pub struct ConcatenationCombiner;

NIST SP 800-56C Rev. 2 Option 1: Concatenation KDF

This implements the concatenation KDF as specified in NIST SP 800-56C Rev. 2, Section 4.1. It concatenates the shared secrets and applies a KDF.

Implementations

impl ConcatenationCombiner

pub fn combine( classical_secret: &[u8], pqc_secret: &[u8], info: &[u8], ) -> PqcResult<SharedSecret>

Combine two shared secrets using concatenation and HKDF

Arguments

• classical_secret - The classical shared secret (e.g., from ECDH)
• pqc_secret - The post-quantum shared secret (e.g., from ML-KEM)
• info - Context-specific information for domain separation

Returns

A combined shared secret of 32 bytes

pub fn combine_with_salt( classical_secret: &[u8], pqc_secret: &[u8], salt: &[u8], info: &[u8], ) -> PqcResult<SharedSecret>

Combine with additional salt parameter

Arguments

• classical_secret - The classical shared secret
• pqc_secret - The post-quantum shared secret
• salt - Optional salt value for HKDF
• info - Context-specific information

Trait Implementations

impl HybridCombiner for ConcatenationCombiner

fn combine( &self, classical_secret: &[u8], pqc_secret: &[u8], info: &[u8], ) -> PqcResult<SharedSecret>

Combine classical and post-quantum shared secrets

fn algorithm_name(&self) -> &'static str

Get the name of the combiner algorithm