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Enable no_std on transcript

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Removes the Vec challenge for an associated type.

Fixes the merlin feature which was horribly broken.

Also adds no_std to dalek-ff-group.
This commit is contained in:
Luke Parker
2022-06-28 04:02:56 -04:00
parent 3de7a76051
commit 1430b189bf
6 changed files with 40 additions and 29 deletions
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34
crypto/transcript/src/lib.rs
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@@ -1,16 +1,18 @@
use core::fmt::Debug;
#![no_std]
#[cfg(features = "merlin")]
#[cfg(feature = "merlin")]
mod merlin;
#[cfg(features = "merlin")]
pub use merlin::MerlinTranscript;
#[cfg(feature = "merlin")]
pub use crate::merlin::MerlinTranscript;
use digest::{typenum::type_operators::IsGreaterOrEqual, consts::U256, Digest};
use digest::{typenum::type_operators::IsGreaterOrEqual, consts::U256, Digest, Output};
pub trait Transcript {
type Challenge: Clone + Send + Sync + AsRef<[u8]>;
fn domain_separate(&mut self, label: &'static [u8]);
fn append_message(&mut self, label: &'static [u8], message: &[u8]);
fn challenge(&mut self, label: &'static [u8]) -> Vec<u8>;
fn challenge(&mut self, label: &'static [u8]) -> Self::Challenge;
fn rng_seed(&mut self, label: &'static [u8]) -> [u8; 32];
}
@@ -34,10 +36,13 @@ impl DigestTranscriptMember {
}
}
#[derive(Clone, Debug)]
pub struct DigestTranscript<D: Clone + Digest>(D) where D::OutputSize: IsGreaterOrEqual<U256>;
pub trait SecureDigest: Clone + Digest {}
impl<D: Clone + Digest> SecureDigest for D where D::OutputSize: IsGreaterOrEqual<U256> {}
impl<D: Clone + Digest> DigestTranscript<D> where D::OutputSize: IsGreaterOrEqual<U256> {
#[derive(Clone, Debug)]
pub struct DigestTranscript<D: SecureDigest>(D);
impl<D: SecureDigest> DigestTranscript<D> {
fn append(&mut self, kind: DigestTranscriptMember, value: &[u8]) {
self.0.update(&[kind.as_u8()]);
// Assumes messages don't exceed 16 exabytes
@@ -52,8 +57,9 @@ impl<D: Clone + Digest> DigestTranscript<D> where D::OutputSize: IsGreaterOrEqua
}
}
impl<D: Digest + Clone> Transcript for DigestTranscript<D>
where D::OutputSize: IsGreaterOrEqual<U256> {
impl<D: SecureDigest> Transcript for DigestTranscript<D> {
type Challenge = Output<D>;
fn domain_separate(&mut self, label: &[u8]) {
self.append(DigestTranscriptMember::Domain, label);
}
@@ -63,14 +69,14 @@ impl<D: Digest + Clone> Transcript for DigestTranscript<D>
self.append(DigestTranscriptMember::Value, message);
}
fn challenge(&mut self, label: &'static [u8]) -> Vec<u8> {
fn challenge(&mut self, label: &'static [u8]) -> Self::Challenge {
self.append(DigestTranscriptMember::Challenge, label);
self.0.clone().finalize().to_vec()
self.0.clone().finalize()
}
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.copy_from_slice(&self.challenge(label)[.. 32]);
seed
}
}