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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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27
crypto/transcript/src/merlin.rs
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@@ -1,15 +1,22 @@
use core::{marker::PhantomData, fmt::{Debug, Formatter}};
use core::fmt::{Debug, Formatter};
use digest::Digest;
use crate::Transcript;
#[derive(Clone, PartialEq)]
#[derive(Clone)]
pub struct MerlinTranscript(pub merlin::Transcript);
// Merlin doesn't implement Debug so provide a stub which won't panic
impl Debug for MerlinTranscript {
fn fmt(&self, _: &mut Formatter<'_>) -> Result<(), std::fmt::Error> { Ok(()) }
fn fmt(&self, _: &mut Formatter<'_>) -> Result<(), core::fmt::Error> { Ok(()) }
}
impl Transcript for MerlinTranscript {
// Uses a challenge length of 64 bytes to support wide reduction on generated scalars
// From a security level standpoint, this should just be 32 bytes
// From a Merlin standpoint, this should be variable per call
// From a practical standpoint, this is a demo file not planned to be used and anything using
// this wrapper should be secure with this setting
type Challenge = [u8; 64];
fn domain_separate(&mut self, label: &'static [u8]) {
self.append_message(b"dom-sep", label);
}
@@ -18,21 +25,15 @@ impl Transcript for MerlinTranscript {
self.0.append_message(label, message);
}
fn challenge(&mut self, label: &'static [u8]) -> Vec<u8> {
let mut challenge = vec![];
// Uses a challenge length of 64 bytes to support wide reduction on generated scalars
// From a security level standpoint, this should just be 32 bytes
// From a Merlin standpoint, this should be variable per call
// From a practical standpoint, this is a demo file not planned to be used and anything using
// this wrapper is fine without any settings it uses
challenge.resize(64, 0);
fn challenge(&mut self, label: &'static [u8]) -> Self::Challenge {
let mut challenge = [0; 64];
self.0.challenge_bytes(label, &mut challenge);
challenge
}
fn rng_seed(&mut self, label: &'static [u8]) -> [u8; 32] {
let mut seed = [0; 32];
transcript.challenge_bytes(label, &mut seed);
seed.copy_from_slice(&self.challenge(label)[.. 32]);
seed
}
}