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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| use crate::stealth_commitments::{AffineWrapper, RawFr, StealthAddressOnCurve}; | ||
| use ark_ff::PrimeField; | ||
| use ark_secp256k1::{Affine as G1Affine, Fq, Fr, Projective as G1Projective}; | ||
| use ark_secp256k1::{G_GENERATOR_X, G_GENERATOR_Y}; | ||
| use tiny_keccak::{Hasher, Keccak}; | ||
|
|
||
| #[allow(non_camel_case_types)] | ||
| pub struct Secp256k1_G1Affine(G1Affine); | ||
| impl AffineWrapper for Secp256k1_G1Affine { | ||
| type Fq = Fq; | ||
| fn new(x: Self::Fq, y: Self::Fq) -> Self { | ||
| Secp256k1_G1Affine(G1Affine::new(x, y)) | ||
| } | ||
| } | ||
|
|
||
| impl From<Secp256k1_G1Affine> for G1Projective { | ||
| fn from(value: Secp256k1_G1Affine) -> Self { | ||
| G1Projective::from(value.0) | ||
| } | ||
| } | ||
|
|
||
| impl RawFr for Fr { | ||
| type Fr = Fr; | ||
| fn as_u64(&self) -> u64 { | ||
| self.0 .0[0] | ||
| } | ||
| } | ||
|
|
||
| pub struct Secp256k1; | ||
|
|
||
| impl StealthAddressOnCurve for Secp256k1 { | ||
| type Projective = G1Projective; | ||
| type Affine = Secp256k1_G1Affine; | ||
| type Fr = Fr; | ||
|
|
||
| fn derive_public_key(private_key: &Self::Fr) -> Self::Projective { | ||
| let g1_generator_affine = Self::Affine::new(G_GENERATOR_X, G_GENERATOR_Y); | ||
| (Self::Projective::from(g1_generator_affine)) * *private_key | ||
| } | ||
|
|
||
| fn hash_to_fr(input: &[u8]) -> Self::Fr { | ||
| let mut hash = [0; 32]; | ||
| let mut hasher = Keccak::v256(); | ||
| hasher.update(input); | ||
| hasher.finalize(&mut hash); | ||
|
|
||
| // We export the hash as a field element | ||
| Self::Fr::from_le_bytes_mod_order(hash.as_slice()) | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
| use ark_ec::CurveGroup; | ||
|
|
||
| type Curve = Secp256k1; | ||
|
|
||
| #[test] | ||
| fn test_random_keypair() { | ||
| let (key, pub_key) = Curve::random_keypair(); | ||
| // Check the derived key matches the one generated from original key | ||
| assert_eq!(Curve::derive_public_key(&key), pub_key); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_hash_to_fr() { | ||
| // Test that hash_to_fr(input_1) != hash_to_fr(input_2) when input_1 != input_2 | ||
| let input_1 = b"input_1"; | ||
| let input_2 = b"input_2"; | ||
| assert_ne!(Curve::hash_to_fr(input_1), Curve::hash_to_fr(input_2)); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_compute_shared_point() { | ||
| // In a multiple participant scenario, any participant's public key | ||
| // combined with any other participant's private key should arrive at the same shared key | ||
| let (key1, pub_key1) = Curve::random_keypair(); | ||
| let (key2, pub_key2) = Curve::random_keypair(); | ||
|
|
||
| let shared1 = Curve::compute_shared_point(key1, pub_key2); | ||
| let shared2 = Curve::compute_shared_point(key2, pub_key1); | ||
|
|
||
| // Convert Projective to Affine for equality comparison | ||
| let shared1_affine = shared1.into_affine(); | ||
| let shared2_affine = shared2.into_affine(); | ||
|
|
||
| assert_eq!(shared1_affine.x, shared2_affine.x); | ||
| assert_eq!(shared1_affine.y, shared2_affine.y); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_stealth_commitment_generation() { | ||
| let (spending_key, spending_public_key) = Curve::random_keypair(); | ||
| let (viewing_key, viewing_public_key) = Curve::random_keypair(); | ||
|
|
||
| // generate ephemeral keypair | ||
| let (ephemeral_private_key, ephemeral_public_key) = Curve::random_keypair(); | ||
|
|
||
| let (stealth_commitment, view_tag) = Curve::generate_stealth_commitment( | ||
| viewing_public_key, | ||
| spending_public_key, | ||
| ephemeral_private_key, | ||
| ); | ||
|
|
||
| let stealth_private_key_opt = Curve::generate_stealth_private_key( | ||
| ephemeral_public_key, | ||
| viewing_key, | ||
| spending_key, | ||
| view_tag, | ||
| ); | ||
|
|
||
| if stealth_private_key_opt.is_none() { | ||
| panic!("View tags did not match"); | ||
| } | ||
|
|
||
| let derived_commitment = Curve::derive_public_key(&stealth_private_key_opt.unwrap()); | ||
| assert_eq!(derived_commitment, stealth_commitment); | ||
| } | ||
| } |