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Remove useless Sha256 copies

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This commit is contained in:
Matt Corallo 2018-03-21 18:48:41 -04:00
parent f47ba769f5
commit d14e31f512
2 changed files with 19 additions and 25 deletions
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19
src/ln/channel.rs
View file

@ -43,34 +43,33 @@ pub struct ChannelKeys {
impl ChannelKeys {
pub fn new_from_seed(seed: &[u8; 32]) -> Result<ChannelKeys, secp256k1::Error> {
let sha = Sha256::new();
let mut prk = [0; 32];
hkdf_extract(sha, b"rust-lightning key gen salt", seed, &mut prk);
hkdf_extract(Sha256::new(), b"rust-lightning key gen salt", seed, &mut prk);
let secp_ctx = Secp256k1::new();
let mut okm = [0; 32];
hkdf_expand(sha, &prk, b"rust-lightning funding key info", &mut okm);
hkdf_expand(Sha256::new(), &prk, b"rust-lightning funding key info", &mut okm);
let funding_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(sha, &prk, b"rust-lightning revocation base key info", &mut okm);
hkdf_expand(Sha256::new(), &prk, b"rust-lightning revocation base key info", &mut okm);
let revocation_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(sha, &prk, b"rust-lightning payment base key info", &mut okm);
hkdf_expand(Sha256::new(), &prk, b"rust-lightning payment base key info", &mut okm);
let payment_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(sha, &prk, b"rust-lightning delayed payment base key info", &mut okm);
hkdf_expand(Sha256::new(), &prk, b"rust-lightning delayed payment base key info", &mut okm);
let delayed_payment_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(sha, &prk, b"rust-lightning htlc base key info", &mut okm);
hkdf_expand(Sha256::new(), &prk, b"rust-lightning htlc base key info", &mut okm);
let htlc_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(sha, &prk, b"rust-lightning channel close key info", &mut okm);
hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel close key info", &mut okm);
let channel_close_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(sha, &prk, b"rust-lightning channel monitor claim key info", &mut okm);
hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel monitor claim key info", &mut okm);
let channel_monitor_claim_key = SecretKey::from_slice(&secp_ctx, &okm)?;
hkdf_expand(sha, &prk, b"rust-lightning local commitment seed info", &mut okm);
hkdf_expand(Sha256::new(), &prk, b"rust-lightning local commitment seed info", &mut okm);
Ok(ChannelKeys {
funding_key: funding_key,

25
src/ln/peer_channel_encryptor.rs
View file

@ -157,12 +157,11 @@ impl PeerChannelEncryptor {
#[inline]
fn hkdf(state: &mut BidirectionalNoiseState, ss: SharedSecret) -> [u8; 32] {
let sha = Sha256::new();
let mut hkdf = [0; 64];
{
let mut prk = [0; 32];
hkdf_extract(sha, &state.ck, &ss[..], &mut prk);
hkdf_expand(sha, &prk, &[0;0], &mut hkdf);
hkdf_extract(Sha256::new(), &state.ck, &ss[..], &mut prk);
hkdf_expand(Sha256::new(), &prk, &[0;0], &mut hkdf);
}
state.ck.copy_from_slice(&hkdf[0..32]);
let mut res = [0; 32];
@ -313,10 +312,9 @@ impl PeerChannelEncryptor {
PeerChannelEncryptor::encrypt_with_ad(&mut res[50..], 0, &temp_k, &bidirectional_state.h, &[0; 0]);
sha.reset();
let mut prk = [0; 32];
hkdf_extract(sha, &bidirectional_state.ck, &[0; 0], &mut prk);
hkdf_expand(sha, &prk, &[0;0], &mut final_hkdf);
hkdf_extract(Sha256::new(), &bidirectional_state.ck, &[0; 0], &mut prk);
hkdf_expand(Sha256::new(), &prk, &[0;0], &mut final_hkdf);
ck = bidirectional_state.ck.clone();
res
},
@ -375,10 +373,9 @@ impl PeerChannelEncryptor {
PeerChannelEncryptor::decrypt_with_ad(&mut [0; 0], 0, &temp_k, &bidirectional_state.h, &act_three[50..])?;
sha.reset();
let mut prk = [0; 32];
hkdf_extract(sha, &bidirectional_state.ck, &[0; 0], &mut prk);
hkdf_expand(sha, &prk, &[0;0], &mut final_hkdf);
hkdf_extract(Sha256::new(), &bidirectional_state.ck, &[0; 0], &mut prk);
hkdf_expand(Sha256::new(), &prk, &[0;0], &mut final_hkdf);
ck = bidirectional_state.ck.clone();
},
_ => panic!("Wrong direction for act"),
@ -416,11 +413,10 @@ impl PeerChannelEncryptor {
match self.noise_state {
NoiseState::Finished { ref mut sk, ref mut sn, ref mut sck, rk: _, rn: _, rck: _ } => {
if *sn >= 1000 {
let mut sha = Sha256::new();
let mut prk = [0; 32];
hkdf_extract(sha, sck, sk, &mut prk);
hkdf_extract(Sha256::new(), sck, sk, &mut prk);
let mut hkdf = [0; 64];
hkdf_expand(sha, &prk, &[0;0], &mut hkdf);
hkdf_expand(Sha256::new(), &prk, &[0;0], &mut hkdf);
sck[..].copy_from_slice(&hkdf[0..32]);
sk[..].copy_from_slice(&hkdf[32..]);
@ -447,11 +443,10 @@ impl PeerChannelEncryptor {
match self.noise_state {
NoiseState::Finished { sk: _, sn: _, sck: _, ref mut rk, ref mut rn, ref mut rck } => {
if *rn >= 1000 {
let mut sha = Sha256::new();
let mut prk = [0; 32];
hkdf_extract(sha, rck, rk, &mut prk);
hkdf_extract(Sha256::new(), rck, rk, &mut prk);
let mut hkdf = [0; 64];
hkdf_expand(sha, &prk, &[0;0], &mut hkdf);
hkdf_expand(Sha256::new(), &prk, &[0;0], &mut hkdf);
rck[..].copy_from_slice(&hkdf[0..32]);
rk[..].copy_from_slice(&hkdf[32..]);