Add BlindSignatureScheme trait abstraction

src/lib.rs

@@ -1,2 +1,58 @@
+use ark_std::rand::Rng;
+
 pub mod mala_nezhadansari;
 pub mod schnorr_blind;
+
+use ark_ff::PrimeField;
+use arkworks_native_gadgets::poseidon;
+
+pub trait BlindSignatureScheme {
+    type Parameters;
+    type Fq;
+    type Fr;
+    type ConstraintF: PrimeField;
+    type PointAffine;
+    type SecretKey;
+    type PublicKey;
+    type BlindedSignature;
+    type Signature;
+    type UserSecretData;
+
+    fn setup(hash: &poseidon::Poseidon<Self::ConstraintF>) -> Self::Parameters;
+
+    fn keygen<R: Rng>(
+        parameters: &Self::Parameters,
+        rng: &mut R,
+    ) -> (Self::PublicKey, Self::SecretKey);
+
+    fn new_request_params<R: Rng>(
+        parameters: &Self::Parameters,
+        rng: &mut R,
+    ) -> (Self::Fr, Self::PointAffine);
+
+    fn blind_sign(sk: Self::SecretKey, r: Self::Fr, m_blinded: Self::Fr) -> Self::BlindedSignature;
+
+    fn unblind(s_blinded: Self::Fr, u: &Self::UserSecretData) -> Self::Signature;
+
+    fn non_blind_sign<R: Rng>(
+        parameters: &Self::Parameters,
+        rng: &mut R,
+        sk: Self::SecretKey,
+        m: &[Self::ConstraintF],
+    ) -> Result<Self::Signature, ark_crypto_primitives::Error>;
+
+    fn blind<R: Rng>(
+        parameters: &Self::Parameters,
+        rng: &mut R,
+        m: &[Self::ConstraintF],
+        signer_pk: Self::PublicKey,
+        signer_r: Self::PointAffine,
+    ) -> Result<(Self::Fr, Self::UserSecretData), ark_crypto_primitives::Error>;
+
+    fn verify(
+        parameters: &Self::Parameters,
+        m: &[Self::ConstraintF],
+        s: Self::Signature,
+        q: Self::PublicKey,
+    ) -> bool;
+}