Remove useless Sha256 copies

[rust-lightning] / src / ln / peer_channel_encryptor.rs

diff --git a/src/ln/peer_channel_encryptor.rs b/src/ln/peer_channel_encryptor.rs
index 2de38e68f8a0dd7ff297cd2e63a23fc43dde559c..9c400ba2b7057986c8a44bced868378f3e3a3213 100644 (file)
--- a/src/ln/peer_channel_encryptor.rs
+++ b/src/ln/peer_channel_encryptor.rs
@@ -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..]);