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Make Schnorr modular to its transcript

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This commit is contained in:
Luke Parker
2023-03-07 05:30:21 -05:00
parent 6bff3866ea
commit 837c776297
6 changed files with 43 additions and 27 deletions
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36
crypto/frost/src/algorithm.rs
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@@ -127,28 +127,42 @@ pub trait Hram<C: Curve>: Send + Clone {
fn hram(R: &C::G, A: &C::G, m: &[u8]) -> C::F;
}
/// IETF-compliant Schnorr signature algorithm ((R, s) where s = r + cx).
/// Schnorr signature algorithm ((R, s) where s = r + cx).
#[derive(Clone)]
pub struct Schnorr<C: Curve, H: Hram<C>> {
transcript: IetfTranscript,
pub struct Schnorr<C: Curve, T: Clone + Debug + Transcript, H: Hram<C>> {
transcript: T,
c: Option<C::F>,
_hram: PhantomData<H>,
}
impl<C: Curve, H: Hram<C>> Default for Schnorr<C, H> {
fn default() -> Self {
Self::new()
/// IETF-compliant Schnorr signature algorithm.
///
/// This algorithm specifically uses the transcript format defined in the FROST IETF draft.
/// It's a naive transcript format not viable for usage in larger protocols, yet is presented here
/// in order to provide compatibility.
///
/// Usage of this with key offsets will break the intended compatibility as the IETF draft does not
/// specify a protocol for offsets.
pub type IetfSchnorr<C, H> = Schnorr<C, IetfTranscript, H>;
impl<C: Curve, T: Clone + Debug + Transcript, H: Hram<C>> Schnorr<C, T, H> {
/// Construct a Schnorr algorithm continuing the specified transcript.
pub fn new(transcript: T) -> Schnorr<C, T, H> {
Schnorr { transcript, c: None, _hram: PhantomData }
}
}
impl<C: Curve, H: Hram<C>> Schnorr<C, H> {
pub fn new() -> Schnorr<C, H> {
Schnorr { transcript: IetfTranscript(vec![]), c: None, _hram: PhantomData }
impl<C: Curve, H: Hram<C>> IetfSchnorr<C, H> {
/// Construct a IETF-compatible Schnorr algorithm.
///
/// Please see the IetfSchnorr documentation for the full details of this.
pub fn ietf() -> IetfSchnorr<C, H> {
Schnorr::new(IetfTranscript(vec![]))
}
}
impl<C: Curve, H: Hram<C>> Algorithm<C> for Schnorr<C, H> {
type Transcript = IetfTranscript;
impl<C: Curve, T: Clone + Debug + Transcript, H: Hram<C>> Algorithm<C> for Schnorr<C, T, H> {
type Transcript = T;
type Addendum = ();
type Signature = SchnorrSignature<C>;