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Remove rng_seed's additional entropy

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It was never used as we derive entropy via the other fields in the 
transcript, and explicitly add fields directly as needed for entropy.

Also drops an unused crate and corrects a bug in FROST's Schnorr 
implementation which used the Group's generator, instead of the Curve's.

Also updates the Monero crate's description.
This commit is contained in:
Luke Parker
2022-05-31 02:12:14 -04:00
parent e504266c80
commit 7b4c5dbe52
8 changed files with 11 additions and 21 deletions
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8
crypto/transcript/src/lib.rs
View File

@@ -11,7 +11,7 @@ pub trait Transcript {
fn domain_separate(&mut self, label: &[u8]);
fn append_message(&mut self, label: &'static [u8], message: &[u8]);
fn challenge(&mut self, label: &'static [u8]) -> Vec<u8>;
fn rng_seed(&mut self, label: &'static [u8], additional_entropy: Option<[u8; 32]>) -> [u8; 32];
fn rng_seed(&mut self, label: &'static [u8]) -> [u8; 32];
}
#[derive(Clone, Debug)]
@@ -49,11 +49,7 @@ impl<D: Digest> Transcript for DigestTranscript<D> {
D::new().chain_update(&self.0).finalize().to_vec()
}
fn rng_seed(&mut self, label: &'static [u8], additional_entropy: Option<[u8; 32]>) -> [u8; 32] {
if additional_entropy.is_some() {
self.append_message(b"additional_entropy", &additional_entropy.unwrap());
}
fn rng_seed(&mut self, label: &'static [u8]) -> [u8; 32] {
let mut seed = [0; 32];
seed.copy_from_slice(&self.challenge(label)[0 .. 32]);
seed

6
crypto/transcript/src/merlin.rs
View File

@@ -30,11 +30,7 @@ impl Transcript for MerlinTranscript {
challenge
}
fn rng_seed(&mut self, label: &'static [u8], additional_entropy: Option<[u8; 32]>) -> [u8; 32] {
if additional_entropy.is_some() {
transcript.append_message(b"additional_entropy", &additional_entropy.unwrap());
}
fn rng_seed(&mut self, label: &'static [u8]) -> [u8; 32] {
let mut seed = [0; 32];
transcript.challenge_bytes(label, &mut seed);
seed