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Use algorithm for ECDH that is described in the specification #724

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Use algorithm for ECDH that is described in the specification #724

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9 changes: 7 additions & 2 deletions protocols/v2/noise-sv2/src/handshake.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -109,8 +109,13 @@ pub trait HandshakeOp<Cipher: AeadCipher>: CipherState<Cipher> {
fn ecdh(private: &[u8], public: &[u8]) -> [u8; 32] {
let private = SecretKey::from_slice(private).expect("Wrong key");
let x_public = XOnlyPublicKey::from_slice(public).expect("Wrong key");
let res = SharedSecret::new(&x_public.public_key(crate::PARITY), &private);
res.secret_bytes()
let ec_point_x_y = secp256k1::ecdh::shared_secret_point(
&x_public.public_key(secp256k1::Parity::Even),
&private,
);
let mut ec_point_x = [0; 32];
ec_point_x.copy_from_slice(&ec_point_x_y[0..32]);
ec_point_x
}

/// Prior to starting first round of NX-handshake, both initiator and responder initializes
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