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Cleanup which makes transcript optional, only required for multisig

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This commit is contained in:
Luke Parker
2022-05-03 08:49:46 -04:00
parent 56fc39fff5
commit 9a42391b75
12 changed files with 167 additions and 161 deletions
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25
crypto/transcript/src/lib.rs
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@@ -16,7 +16,11 @@ pub trait Transcript {
fn new(label: &'static [u8]) -> Self;
fn append_message(&mut self, label: &'static [u8], message: &[u8]);
fn challenge(&mut self, label: &'static [u8], len: usize) -> Vec<u8>;
fn seeded_rng(&self, label: &'static [u8], additional_entropy: Option<[u8; 32]>) -> Self::SeededRng;
fn seeded_rng(
&self,
label: &'static [u8],
additional_entropy: Option<[u8; 32]>
) -> Self::SeededRng;
}
#[derive(Clone, Debug)]
@@ -40,15 +44,28 @@ impl<D: Digest> Transcript for DigestTranscript<D> {
self.0.extend(label);
let mut challenge = Vec::with_capacity(len);
challenge.extend(&D::new().chain_update(&self.0).chain_update(&0u64.to_le_bytes()).finalize());
challenge.extend(
&D::new()
.chain_update(&self.0)
.chain_update(&0u64.to_le_bytes()).finalize()
);
for i in 0 .. (len / challenge.len()) {
challenge.extend(&D::new().chain_update(&self.0).chain_update(&u64::try_from(i).unwrap().to_le_bytes()).finalize());
challenge.extend(
&D::new()
.chain_update(&self.0)
.chain_update(&u64::try_from(i).unwrap().to_le_bytes())
.finalize()
);
}
challenge.truncate(len);
challenge
}
fn seeded_rng(&self, label: &'static [u8], additional_entropy: Option<[u8; 32]>) -> Self::SeededRng {
fn seeded_rng(
&self,
label: &'static [u8],
additional_entropy: Option<[u8; 32]>
) -> Self::SeededRng {
let mut transcript = DigestTranscript::<D>(self.0.clone(), PhantomData);
if additional_entropy.is_some() {
transcript.append_message(b"additional_entropy", &additional_entropy.unwrap());