vexahub/opaque-vx
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Reuse hashers by hasher.finalize_reset which is slightly faster than constructing the hasher object each time.

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This commit is contained in:
Kostas Chalkias
2021-02-04 17:00:17 -08:00
parent 099f887530
commit e32b240ce2
2 changed files with 12 additions and 15 deletions
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src/key_exchange/tripledh.rs
+10 -12
View File
@@ -129,19 +129,18 @@ impl<D: Hash, G: Group> KeyExchange<D, G> for TripleDH {
]
.concat();
let mut hasher2 = D::new();
hasher2.update(&transcript2);
let hashed_transcript_without_mac = hasher2.finalize();
let mut hasher = D::new();
hasher.update(&transcript2);
let hashed_transcript_without_mac = hasher.finalize_reset();
let mut mac_hasher =
Hmac::<D>::new_varkey(&km2).map_err(|_| InternalPakeError::HmacError)?;
mac_hasher.update(&hashed_transcript_without_mac);
let mac = mac_hasher.finalize().into_bytes();
let mut hasher3 = D::new();
hasher3.update(&transcript2);
hasher3.update(&mac);
let hashed_transcript = hasher3.finalize();
hasher.update(&transcript2);
hasher.update(&mac);
let hashed_transcript = hasher.finalize();
Ok((
ke1_message.info,
@@ -194,7 +193,7 @@ impl<D: Hash, G: Group> KeyExchange<D, G> for TripleDH {
let mut hasher = D::new();
hasher.update(&transcript);
let hashed_transcript_without_mac = hasher.finalize();
let hashed_transcript_without_mac = hasher.finalize_reset();
let mut server_mac =
Hmac::<D>::new_varkey(&km2).map_err(|_| InternalPakeError::HmacError)?;
@@ -206,10 +205,9 @@ impl<D: Hash, G: Group> KeyExchange<D, G> for TripleDH {
));
}
let mut hasher2 = D::new();
hasher2.update(transcript);
hasher2.update(ke2_message.mac.to_vec());
let hashed_transcript = hasher2.finalize();
hasher.update(transcript);
hasher.update(ke2_message.mac.to_vec());
let hashed_transcript = hasher.finalize();
let mut client_mac =
Hmac::<D>::new_varkey(&km3).map_err(|_| InternalPakeError::HmacError)?;
src/map_to_curve.rs
+2 -3
View File
@@ -84,17 +84,16 @@ pub(crate) fn expand_message_xmd<H: Hash>(
h.update(&b[0]);
h.update(&i2osp(1, 1));
h.update(&dst_prime);
b.push(h.finalize().to_vec()); // b[1]
b.push(h.finalize_reset().to_vec()); // b[1]
let mut uniform_bytes: Vec<u8> = Vec::new();
uniform_bytes.extend_from_slice(&b[1]);
for i in 2..(ell + 1) {
let mut h = H::new();
h.update(xor(&b[0], &b[i - 1])?);
h.update(&i2osp(i, 1));
h.update(&dst_prime);
b.push(h.finalize().to_vec()); // b[i]
b.push(h.finalize_reset().to_vec()); // b[i]
uniform_bytes.extend_from_slice(&b[i]);
}