Function breez_sdk_liquid::bitcoin::util::key::secp256k1::ecdh::shared_secret_point
pub fn shared_secret_point(point: &PublicKey, scalar: &SecretKey) -> [u8; 64]
Expand description
Creates a shared point from public key and secret key.
Important: use of a strong cryptographic hash function may be critical to security! Do NOT use unless you understand cryptographical implications. If not, use SharedSecret instead.
Can be used like SharedSecret
but caller is responsible for then hashing the returned buffer.
This allows for the use of a custom hash function since SharedSecret
uses SHA256.
§Returns
64 bytes representing the (x,y) co-ordinates of a point on the curve (32 bytes each).
§Examples
let s = Secp256k1::new();
let (sk1, pk1) = s.generate_keypair(&mut thread_rng());
let (sk2, pk2) = s.generate_keypair(&mut thread_rng());
let point1 = ecdh::shared_secret_point(&pk2, &sk1);
let secret1 = sha512::Hash::hash(&point1);
let point2 = ecdh::shared_secret_point(&pk1, &sk2);
let secret2 = sha512::Hash::hash(&point2);
assert_eq!(secret1, secret2)