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crypto.ml_kem: avoid redundant assignment & fix K-PKE.KeyGen

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FIPS-203 algorithm 13 for deterministic key generation uses
(𝜌, 𝜎) ← G(𝑑 ‖ 𝑘) , not (𝜌, 𝜎) ← G(k ‖ d)
This commit is contained in:
Frank Denis 2025-11-24 12:11:41 +01:00
parent b31173179b
commit 1f5baf3cd1
1 changed files with 1 additions and 2 deletions
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3
lib/std/crypto/ml_kem.zig
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@ -376,7 +376,6 @@ fn Kyber(comptime p: Params) type {
/// Except in tests, applications should generally call `generate()` instead of this function.
pub fn generateDeterministic(seed: [seed_length]u8) !KeyPair {
var ret: KeyPair = undefined;
ret.secret_key.z = seed[inner_seed_length..seed_length].*;
// Generate inner key
innerKeyFromSeed(
@ -507,8 +506,8 @@ fn Kyber(comptime p: Params) type {
fn innerKeyFromSeed(seed: [inner_seed_length]u8, pk: *InnerPk, sk: *InnerSk) void {
var expanded_seed: [64]u8 = undefined;
var h = sha3.Sha3_512.init(.{});
if (p.ml_kem) h.update(&[1]u8{p.k});
h.update(&seed);
if (p.ml_kem) h.update(&[1]u8{p.k});
h.final(&expanded_seed);
pk.rho = expanded_seed[0..32].*;
const sigma = expanded_seed[32..64];