stealth-address-kit

Uses the arkworks-rs suite of libraries.

Existing Implementations

1. ark_bn254
2. ark_bls_12_381
3. ark_bls_12_377
4. secp256k1
5. secp256r1
6. pallas
7. vesta
8. bw6_761
9. baby_jub_jub

Usage

use stealth_address_kit::StealthAddressOnCurve;
use ark_bn254::Bn254; // or ark_bls_12_381::Bls12_381 or ark_bls_12_377::Bls12_377, stealth_address_kit::Secp256k1, stealth_address_kit::Secp256r1, etc

fn main() {
    let (spending_key, spending_public_key) = Bn254::random_keypair();
    let (viewing_key, viewing_public_key) = Bn254::random_keypair();

    // generate ephemeral keypair
    let (ephemeral_private_key, ephemeral_public_key) = Bn254::random_keypair();

    let (stealth_address, view_tag) = Bn254::generate_stealth_address(viewing_public_key, spending_public_key, ephemeral_private_key);

    let stealth_private_key_opt = Bn254::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_stealth_address = Bn254::derive_public_key(&stealth_private_key_opt.unwrap());
    assert_eq!(derived_stealth_address, stealth_address);
}

Adding a new curve

1. Add the curve to the Cargo.toml file, as a feature
2. Create a new module in the src directory, with the curve name, suffixed by _impl.rs
3. Implement the StealthAddressOnCurve trait for the curve
4. Define the macro define_curve_ffi
5. Add the curve to the lib.rs file, in the mod declaration, as well as re-export if required
6. Add the curve to the README
7. Add the curve to the nightly release workflow

Building and Testing

1. Building cargo build --release --features <bn254/bls12_381/bls12_377/secp256k1/secp256r1/etc>

2. Testing cargo test --release --features <bn254/bls12_381/bls12_377/secp256k1/secp256r1/etc>

FFI Api

The exposed FFI API supports all curves, prefixed by the curve name. Ensure that the correct feature is enabled when building the library.

Precompiled Libraries

Check out the nightly releases.

Attribution

• Inspired by the erc-5564 eip and the poc by Nerolation.