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use crate::{
encryption::{GroupEncryption, GroupEncryptionParameters, GroupEncryptionPublicKey},
errors::SignatureError,
signature::{Schnorr, SchnorrParameters, SchnorrPublicKey, SchnorrSignature},
traits::{EncryptionScheme, SignatureScheme},
};
use snarkvm_curves::traits::{Group, ProjectiveCurve};
use snarkvm_fields::PrimeField;
use snarkvm_utilities::{serialize::*, to_bytes, FromBytes, ToBytes};
use digest::Digest;
use rand::Rng;
use std::{hash::Hash, marker::PhantomData};
fn into_signature_group<G: Group + ProjectiveCurve + CanonicalSerialize, SG: Group + CanonicalDeserialize>(
projective: G,
) -> SG {
let mut bytes = vec![];
CanonicalSerialize::serialize(&projective.into_affine(), &mut bytes).expect("failed to convert to bytes");
CanonicalDeserialize::deserialize(&mut &bytes[..]).expect("failed to convert to signature group")
}
impl<G: Group + ProjectiveCurve + CanonicalSerialize, SG: Group + CanonicalDeserialize, D: Digest>
From<GroupEncryptionParameters<G>> for Schnorr<SG, D>
{
fn from(parameters: GroupEncryptionParameters<G>) -> Self {
let generator_powers: Vec<SG> = parameters
.generator_powers
.iter()
.map(|p| into_signature_group(*p))
.collect();
let parameters = SchnorrParameters {
generator_powers,
salt: parameters.salt,
_hash: PhantomData,
};
Self { parameters }
}
}
impl<G: Group + ProjectiveCurve, SG: Group + CanonicalSerialize + CanonicalDeserialize>
From<GroupEncryptionPublicKey<G>> for SchnorrPublicKey<SG>
{
fn from(public_key: GroupEncryptionPublicKey<G>) -> Self {
Self(into_signature_group(public_key.0))
}
}
impl<G: Group + ProjectiveCurve, SG: Group + Hash + CanonicalSerialize + CanonicalDeserialize, D: Digest + Send + Sync>
SignatureScheme for GroupEncryption<G, SG, D>
where
<G as Group>::ScalarField: PrimeField,
{
type Parameters = GroupEncryptionParameters<G>;
type PrivateKey = <G as Group>::ScalarField;
type PublicKey = GroupEncryptionPublicKey<G>;
type Signature = SchnorrSignature<SG>;
fn setup<R: Rng>(rng: &mut R) -> Result<Self, SignatureError> {
Ok(<Self as EncryptionScheme>::setup(rng))
}
fn parameters(&self) -> &Self::Parameters {
&self.parameters
}
fn generate_private_key<R: Rng>(&self, rng: &mut R) -> Result<Self::PrivateKey, SignatureError> {
Ok(<Self as EncryptionScheme>::generate_private_key(self, rng))
}
fn generate_public_key(&self, private_key: &Self::PrivateKey) -> Result<Self::PublicKey, SignatureError> {
Ok(<Self as EncryptionScheme>::generate_public_key(self, private_key).unwrap())
}
fn sign<R: Rng>(
&self,
private_key: &Self::PrivateKey,
message: &[u8],
rng: &mut R,
) -> Result<Self::Signature, SignatureError> {
let schnorr_signature: Schnorr<SG, D> = self.parameters.clone().into();
let private_key = <SG as Group>::ScalarField::read(&to_bytes![private_key]?[..])?;
Ok(schnorr_signature.sign(&private_key, message, rng)?)
}
fn verify(
&self,
public_key: &Self::PublicKey,
message: &[u8],
signature: &Self::Signature,
) -> Result<bool, SignatureError> {
let schnorr_signature: Schnorr<SG, D> = self.parameters.clone().into();
let schnorr_public_key: SchnorrPublicKey<SG> = (*public_key).into();
Ok(schnorr_signature.verify(&schnorr_public_key, message, signature)?)
}
fn randomize_public_key(
&self,
_public_key: &Self::PublicKey,
_randomness: &[u8],
) -> Result<Self::PublicKey, SignatureError> {
unimplemented!()
}
fn randomize_signature(
&self,
_signature: &Self::Signature,
_randomness: &[u8],
) -> Result<Self::Signature, SignatureError> {
unimplemented!()
}
}