arnaucube/ark-ec-blind-signatures
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Update native lib over BasePrimeField

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arnaucube
2022-10-19 19:42:31 +02:00
parent 2b847bf891
commit c6af5a5e61
1 changed files with 20 additions and 15 deletions
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35
src/lib.rs
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@@ -30,6 +30,7 @@ use ark_ed_on_bn254::{
EdwardsAffine, EdwardsParameters, EdwardsProjective, FqParameters, Fr, FrParameters, EdwardsAffine, EdwardsParameters, EdwardsProjective, FqParameters, Fr, FrParameters,
}; };
type ConstraintF<C> = <<C as ProjectiveCurve>::BaseField as Field>::BasePrimeField;
pub type SecretKey<C> = <C as ProjectiveCurve>::ScalarField; pub type SecretKey<C> = <C as ProjectiveCurve>::ScalarField;
pub type PublicKey<C> = <C as ProjectiveCurve>::Affine; pub type PublicKey<C> = <C as ProjectiveCurve>::Affine;
pub type BlindedSignature<C> = <C as ProjectiveCurve>::ScalarField; pub type BlindedSignature<C> = <C as ProjectiveCurve>::ScalarField;
@@ -135,14 +136,11 @@ where
pub fn blind<R: Rng>( pub fn blind<R: Rng>(
parameters: &Parameters<C>, parameters: &Parameters<C>,
rng: &mut R, rng: &mut R,
poseidon_hash: &poseidon::Poseidon<C::ScalarField>, poseidon_hash: &poseidon::Poseidon<ConstraintF<C>>,
m: C::ScalarField, m: ConstraintF<C>,
signer_r: C::Affine, signer_r: C::Affine,
) -> Result<(C::ScalarField, UserSecretData<C>), ark_crypto_primitives::Error> ) -> Result<(C::ScalarField, UserSecretData<C>), ark_crypto_primitives::Error>
where where
<C as ProjectiveCurve>::ScalarField: Mul<Fp256<FrParameters>>,
<C as ProjectiveCurve>::ScalarField:
From<<<C as ProjectiveCurve>::ScalarField as Mul<Fp256<FrParameters>>>::Output>,
<C as ProjectiveCurve>::ScalarField: From<BigInteger256>, <C as ProjectiveCurve>::ScalarField: From<BigInteger256>,
{ {
let u = Self::new_blind_params(parameters, rng, signer_r); let u = Self::new_blind_params(parameters, rng, signer_r);
@@ -152,8 +150,11 @@ where
let x_fr = C::ScalarField::from(r.x.into_repr()); let x_fr = C::ScalarField::from(r.x.into_repr());
// m' = a^-1 rx h(m) // m' = a^-1 rx h(m)
let h_m = poseidon_hash.hash(&[m])?; // TODO hash(m) must be \in Fr
let m_blinded = C::ScalarField::from(u.a.inverse().unwrap() * x_fr) * h_m; let hm = poseidon_hash.hash(&[m])?;
// let hm_fr = C::ScalarField::from_repr(hm.into_repr()).unwrap();
let hm_fr = C::ScalarField::from_le_bytes_mod_order(&to_bytes!(hm)?); // WIP TMP
let m_blinded = C::ScalarField::from(u.a.inverse().unwrap() * x_fr) * hm_fr;
Ok((m_blinded, u)) Ok((m_blinded, u))
} }
@@ -166,8 +167,8 @@ where
pub fn verify( pub fn verify(
parameters: &Parameters<C>, parameters: &Parameters<C>,
poseidon_hash: &poseidon::Poseidon<C::ScalarField>, poseidon_hash: &poseidon::Poseidon<ConstraintF<C>>,
m: C::ScalarField, m: ConstraintF<C>,
s: Signature<C>, s: Signature<C>,
q: PublicKey<C>, q: PublicKey<C>,
) -> bool ) -> bool
@@ -176,7 +177,10 @@ where
{ {
let sG = parameters.generator.mul(s.s.into_repr()); let sG = parameters.generator.mul(s.s.into_repr());
let h_m = poseidon_hash.hash(&[m]).unwrap(); // TODO hash(m) must be \in Fr
let hm = poseidon_hash.hash(&[m]).unwrap();
// let hm_fr = C::ScalarField::from_repr(hm.into_repr()).unwrap();
let hm_fr = C::ScalarField::from_le_bytes_mod_order(&to_bytes!(hm).unwrap()); // WIP TMP
// check that s.R.x is in Fr // check that s.R.x is in Fr
let r = EdwardsAffine::from(s.r); // WIP let r = EdwardsAffine::from(s.r); // WIP
@@ -189,7 +193,7 @@ where
} }
// get s.R.x // get s.R.x
let x_fr = C::ScalarField::from(r.x.into_repr()); let x_fr = C::ScalarField::from(r.x.into_repr());
let right = s.r + q.mul((x_fr * h_m).into_repr()).into_affine(); let right = s.r + q.mul((x_fr * hm_fr).into_repr()).into_affine();
sG.into_affine() == right sG.into_affine() == right
} }
@@ -219,13 +223,14 @@ pub fn poseidon_setup_params<F: PrimeField>(
#[cfg(test)] #[cfg(test)]
mod tests { mod tests {
use super::*; use super::*;
pub type ConstraintF = ark_ed_on_bn254::Fr; // scalar field pub type Fq = ark_ed_on_bn254::Fq; // base field
// pub type Fr = ark_ed_on_bn254::Fr; // scalar field
#[test] #[test]
fn test_blind() { fn test_blind_signature_flow_native() {
type S = BlindSigScheme<EdwardsProjective>; type S = BlindSigScheme<EdwardsProjective>;
let poseidon_params = poseidon_setup_params::<ConstraintF>(Curve::Bn254, 5, 3); let poseidon_params = poseidon_setup_params::<Fq>(Curve::Bn254, 5, 3);
let poseidon_hash = poseidon::Poseidon::new(poseidon_params); let poseidon_hash = poseidon::Poseidon::new(poseidon_params);
let mut rng = ark_std::test_rng(); let mut rng = ark_std::test_rng();
@@ -234,7 +239,7 @@ mod tests {
let (pk, sk) = S::keygen(&params, &mut rng); let (pk, sk) = S::keygen(&params, &mut rng);
let (k, signer_r) = S::new_request_params(&params, &mut rng); let (k, signer_r) = S::new_request_params(&params, &mut rng);
let m = ConstraintF::from(1234); let m = Fq::from(1234);
let (m_blinded, u) = S::blind(&params, &mut rng, &poseidon_hash, m, signer_r).unwrap(); let (m_blinded, u) = S::blind(&params, &mut rng, &poseidon_hash, m, signer_r).unwrap();