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Update FROST signing to match the IETF draft

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Modernizes dependencies
This commit is contained in:
Luke Parker
2022-04-23 03:49:30 -04:00
parent 76a6ff46be
commit e22dcb1441
18 changed files with 226 additions and 724 deletions
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43
sign/frost/src/algorithm.rs
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@@ -1,13 +1,13 @@
use core::{marker::PhantomData, fmt::Debug};
use rand_core::{RngCore, CryptoRng};
use digest::Digest;
use group::Group;
use crate::{Curve, FrostError, sign};
pub trait Algorithm<C: Curve>: Clone + Debug {
/// Algorithm to use FROST with
pub trait Algorithm<C: Curve>: Clone {
/// The resulting type of the signatures this algorithm will produce
type Signature: Clone + Debug;
@@ -59,40 +59,24 @@ pub trait Algorithm<C: Curve>: Clone + Debug {
) -> bool;
}
pub trait Hram: PartialEq + Eq + Copy + Clone + Debug {
pub trait Hram<C: Curve>: Clone {
/// HRAM function to generate a challenge
/// H2 from the IETF draft despite having a different argument set (not pre-formatted)
#[allow(non_snake_case)]
fn hram<C: Curve>(R: &C::G, A: &C::G, m: &[u8]) -> C::F;
fn hram(R: &C::G, A: &C::G, m: &[u8]) -> C::F;
}
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
pub struct Blake2bHram {}
impl Hram for Blake2bHram {
#[allow(non_snake_case)]
fn hram<C: Curve>(R: &C::G, A: &C::G, m: &[u8]) -> C::F {
C::F_from_bytes_wide(
blake2::Blake2b::new()
.chain(C::G_to_bytes(R))
.chain(C::G_to_bytes(A))
.chain(m)
.finalize()
.as_slice()
.try_into()
.expect("couldn't convert a 64-byte hash to a 64-byte array")
)
}
}
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
pub struct Schnorr<C: Curve, H: Hram> {
#[derive(Clone)]
pub struct Schnorr<C: Curve, H: Hram<C>> {
c: Option<C::F>,
hram: PhantomData<H>,
_hram: PhantomData<H>,
}
impl<C: Curve, H: Hram> Schnorr<C, H> {
impl<C: Curve, H: Hram<C>> Schnorr<C, H> {
pub fn new() -> Schnorr<C, H> {
Schnorr {
c: None,
hram: PhantomData
_hram: PhantomData
}
}
}
@@ -104,7 +88,8 @@ pub struct SchnorrSignature<C: Curve> {
pub s: C::F,
}
impl<C: Curve, H: Hram> Algorithm<C> for Schnorr<C, H> {
/// Implementation of Schnorr signatures for use with FROST
impl<C: Curve, H: Hram<C>> Algorithm<C> for Schnorr<C, H> {
type Signature = SchnorrSignature<C>;
fn context(&self) -> Vec<u8> {
@@ -141,7 +126,7 @@ impl<C: Curve, H: Hram> Algorithm<C> for Schnorr<C, H> {
nonce: C::F,
msg: &[u8],
) -> C::F {
let c = H::hram::<C>(&nonce_sum, &params.group_key(), msg);
let c = H::hram(&nonce_sum, &params.group_key(), msg);
self.c = Some(c);
nonce + (params.secret_share() * c)