INNER CODE UNIT · Go
func
lightningnetwork/lightning-onion · crypto.go:59
func (p *PrivKeyECDH) PubKey() *btcec.PublicKey {
return p.PrivKey.PubKey()
}
// ECDH performs a scalar multiplication (ECDH-like operation) between the
// abstracted private key and a remote public key. The output returned will be
// the sha256 of the resulting shared point serialized in compressed format. If
// k is our private key, and P is the public key, we perform the following
// operation:
//
// sx := k*P
// s := sha256(sx.SerializeCompressed())
//
// NOTE: This is part of the SingleKeyECDH interface.
func (p *PrivKeyECDH) ECDH(pub *btcec.PublicKey) ([32]byte, error) {
var pubJ btcec.JacobianPoint
pub.AsJacobian(&pubJ)