absolutebi/serai
1
0
Fork 0
mirror of https://github.com/serai-dex/serai.git synced 2025-12-08 12:19:24 +00:00
Code Issues Packages Projects Releases Wiki Activity

Use HashMarker for Transcript and when generating scalars from digests

Browse Source
This commit is contained in:
Luke Parker
2022-09-29 05:33:46 -04:00
parent ca091a5f04
commit 8d9315b797
3 changed files with 10 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
crypto/transcript/src/lib.rs
View File

@@ -6,7 +6,7 @@ mod merlin;
#[cfg(feature = "merlin")]
pub use crate::merlin::MerlinTranscript;
use digest::{typenum::type_operators::IsGreaterOrEqual, consts::U256, Digest, Output};
use digest::{typenum::type_operators::IsGreaterOrEqual, consts::U256, Digest, Output, HashMarker};
pub trait Transcript {
type Challenge: Clone + Send + Sync + AsRef<[u8]>;
@@ -50,16 +50,16 @@ impl DigestTranscriptMember {
}
}
pub trait SecureDigest: Clone + Digest {}
impl<D: Clone + Digest> SecureDigest for D where D::OutputSize: IsGreaterOrEqual<U256> {}
/// A trait defining cryptographic Digests with at least a 256-byte output size, assuming at least
/// a 128-bit level of security accordingly.
pub trait SecureDigest: Digest + HashMarker {}
impl<D: Digest + HashMarker> SecureDigest for D where D::OutputSize: IsGreaterOrEqual<U256> {}
/// A simple transcript format constructed around the specified hash algorithm.
#[derive(Clone, Debug)]
pub struct DigestTranscript<D: SecureDigest>(D);
pub struct DigestTranscript<D: Clone + SecureDigest>(D);
impl<D: SecureDigest> DigestTranscript<D> {
impl<D: Clone + SecureDigest> DigestTranscript<D> {
fn append(&mut self, kind: DigestTranscriptMember, value: &[u8]) {
self.0.update([kind.as_u8()]);
// Assumes messages don't exceed 16 exabytes
@@ -68,7 +68,7 @@ impl<D: SecureDigest> DigestTranscript<D> {
}
}
impl<D: SecureDigest> Transcript for DigestTranscript<D> {
impl<D: Clone + SecureDigest> Transcript for DigestTranscript<D> {
type Challenge = Output<D>;
fn new(name: &'static [u8]) -> Self {