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Have DigestTranscript update its digest instead of maintaining a Vec

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This commit is contained in:
Luke Parker 2022-06-24 18:43:32 -04:00
parent 7ee9581d67
commit eb94abb81a
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GPG key ID: F9F1386DB1E119B6
1 changed files with 8 additions and 14 deletions
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22
crypto/transcript/src/lib.rs
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@ -35,30 +35,24 @@ impl DigestTranscriptMember {
}
#[derive(Clone, Debug)]
pub struct DigestTranscript<D: Digest>(Vec<u8>, PhantomData<D>);
pub struct DigestTranscript<D: Clone + Digest>(D, PhantomData<D>);
impl<D: Digest> PartialEq for DigestTranscript<D> {
fn eq(&self, other: &DigestTranscript<D>) -> bool {
self.0 == other.0
}
}
impl<D: Digest> DigestTranscript<D> {
impl<D: Clone + Digest> DigestTranscript<D> {
fn append(&mut self, kind: DigestTranscriptMember, value: &[u8]) {
self.0.push(kind.as_u8());
self.0.update(&[kind.as_u8()]);
// Assumes messages don't exceed 16 exabytes
self.0.extend(u64::try_from(value.len()).unwrap().to_le_bytes());
self.0.extend(value);
self.0.update(u64::try_from(value.len()).unwrap().to_le_bytes());
self.0.update(value);
}
pub fn new(name: &'static [u8]) -> Self {
let mut res = DigestTranscript(vec![], PhantomData);
let mut res = DigestTranscript(D::new(), PhantomData);
res.append(DigestTranscriptMember::Name, name);
res
}
}
impl<D: Digest> Transcript for DigestTranscript<D> {
impl<D: Digest + Clone> Transcript for DigestTranscript<D> {
fn domain_separate(&mut self, label: &[u8]) {
self.append(DigestTranscriptMember::Domain, label);
}
@ -70,7 +64,7 @@ impl<D: Digest> Transcript for DigestTranscript<D> {
fn challenge(&mut self, label: &'static [u8]) -> Vec<u8> {
self.append(DigestTranscriptMember::Challenge, label);
D::new().chain_update(&self.0).finalize().to_vec()
self.0.clone().finalize().to_vec()
}
fn rng_seed(&mut self, label: &'static [u8]) -> [u8; 32] {