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feat: add prefix to the ML KEM kdf

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This commit is contained in:
agureev 2026-06-24 21:17:43 +04:00
parent a12545b332
commit 01accb788c
1 changed files with 5 additions and 3 deletions
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8
lee/state_machine/core/src/encryption/shared_key_derivation.rs
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@ -97,9 +97,11 @@ impl SharedSecretKey {
) -> (Self, EphemeralPublicKey) {
use risc0_zkvm::sha::{Impl, Sha256 as _};
let mut input = [0_u8; 32 + 4];
input[0..32].copy_from_slice(message_hash);
input[32..36].copy_from_slice(&output_index.to_le_bytes());
const PREFIX: &[u8; 21] = b"/LEE/v0.3/KDF-ML-KEM/";
let mut input = [0; 21 + 32 + 4];
input[0..21].copy_from_slice(PREFIX);
input[21..53].copy_from_slice(message_hash);
input[53..57].copy_from_slice(&output_index.to_le_bytes());
let hash = Impl::hash_bytes(&input);
let m: ml_kem::B32 =
ml_kem::array::Array::try_from(hash.as_bytes()).expect("SHA-256 output is 32 bytes");