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Update to FROST v10

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Further expands documentation to near-completion.
This commit is contained in:
Luke Parker
2022-09-29 07:08:20 -04:00
parent 7870084b9e
commit 2b7c9378c0
16 changed files with 95 additions and 65 deletions
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12
crypto/frost/src/sign.rs
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@@ -191,7 +191,10 @@ fn sign_with_share<Re: Read, C: Curve, A: Algorithm<C>>(
// Parse the commitments
for l in &params.view.included {
{
params.algorithm.transcript().append_message(b"participant", &l.to_be_bytes());
params
.algorithm
.transcript()
.append_message(b"participant", C::F::from(u64::from(*l)).to_repr().as_ref());
}
// While this doesn't note which nonce/basepoint this is for, those are expected to be
@@ -274,7 +277,7 @@ fn sign_with_share<Re: Read, C: Curve, A: Algorithm<C>>(
// Generate the per-signer binding factors
for (l, commitments) in B.iter_mut() {
let mut rho_transcript = rho_transcript.clone();
rho_transcript.append_message(b"participant", &l.to_be_bytes());
rho_transcript.append_message(b"participant", C::F::from(u64::from(*l)).to_repr().as_ref());
commitments.1 = C::hash_binding_factor(rho_transcript.challenge(b"rho").as_ref());
}
@@ -365,6 +368,7 @@ fn complete<Re: Read, C: Curve, A: Algorithm<C>>(
Err(FrostError::InternalError("everyone had a valid share yet the signature was still invalid"))
}
/// Trait for the initial state machine of a two-round signing protocol.
pub trait PreprocessMachine {
type Signature: Clone + PartialEq + fmt::Debug;
type SignMachine: SignMachine<Self::Signature>;
@@ -374,6 +378,7 @@ pub trait PreprocessMachine {
fn preprocess<R: RngCore + CryptoRng>(self, rng: &mut R) -> (Self::SignMachine, Vec<u8>);
}
/// Trait for the second machine of a two-round signing protocol.
pub trait SignMachine<S> {
type SignatureMachine: SignatureMachine<S>;
@@ -387,6 +392,7 @@ pub trait SignMachine<S> {
) -> Result<(Self::SignatureMachine, Vec<u8>), FrostError>;
}
/// Trait for the final machine of a two-round signing protocol.
pub trait SignatureMachine<S> {
/// Complete signing.
/// Takes in everyone elses' shares. Returns the signature.
@@ -398,11 +404,13 @@ pub struct AlgorithmMachine<C: Curve, A: Algorithm<C>> {
params: Params<C, A>,
}
/// Next step of the state machine for the signing process.
pub struct AlgorithmSignMachine<C: Curve, A: Algorithm<C>> {
params: Params<C, A>,
preprocess: PreprocessPackage<C>,
}
/// Final step of the state machine for the signing process.
pub struct AlgorithmSignatureMachine<C: Curve, A: Algorithm<C>> {
params: Params<C, A>,
sign: Package<C>,