ecdh

type KeyExchange interface {
	// Curve returns the underlying crypto/ecdh curve implementation when
	// available. For custom curves without a crypto/ecdh counterpart this may
	// return nil.
	Curve() stdecdh.Curve
	// GenerateKey creates a new private key using crypto/rand.
	GenerateKey() (PrivateKey, error)
	// NewPrivateKey constructs a private key from scalar bytes.
	NewPrivateKey(d []byte) (PrivateKey, error)
	// NewPublicKey parses a peer public key in the format required by the curve.
	NewPublicKey(b []byte) (PublicKey, error)
	// SharedSecret performs the ECDH operation between private and peer.
	SharedSecret(p PrivateKey, peer PublicKey) ([]byte, error)
}

type PrivateKey interface {
	// Bytes returns the canonical encoding of the private key.
	Bytes() []byte
	// PublicKey returns the corresponding public key instance.
	PublicKey() PublicKey
	// ECDH computes the shared secret with the peer public key.
	ECDH(peer PublicKey) ([]byte, error)
	// Equal reports whether the provided key matches this private key.
	Equal(x crypto.PrivateKey) bool
}

type PublicKey interface {
	// Bytes returns the canonical encoding of the public key.
	Bytes() []byte
	// Equal reports whether the provided key matches this public key.
	Equal(x crypto.PublicKey) bool
}