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Use dom-sep tags in the transcripts

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Also simplifies form in some places
This commit is contained in:
Luke Parker
2022-05-06 01:35:23 -04:00
parent 0f481773df
commit cc9c2e0d40
4 changed files with 31 additions and 19 deletions
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7
coins/monero/src/clsag/multisig.rs
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@@ -26,7 +26,9 @@ use crate::{
};
impl Input {
pub fn transcript<T: TranscriptTrait>(&self, transcript: &mut T) {
fn transcript<T: TranscriptTrait>(&self, transcript: &mut T) {
// Doesn't dom-sep as this is considered part of the larger input signing proof
// Ring index
transcript.append_message(b"ring_index", &[self.i]);
@@ -170,8 +172,9 @@ impl Algorithm<Ed25519> for Multisig {
}
fn transcript(&self) -> Option<Self::Transcript> {
let mut transcript = Self::Transcript::new(b"CLSAG");
let mut transcript = Self::Transcript::new(b"Monero Multisig");
self.input.transcript(&mut transcript);
transcript.append_message(b"dom-sep", b"CLSAG");
// Given the fact there's only ever one possible value for this, this may technically not need
// to be committed to. If signing a TX, it's be double committed to thanks to the message
// It doesn't hurt to have though and ensures security boundaries are well formed