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package curve4q
import "github.com/cloudflare/circl/ecc/fourq"
// Size is the size in bytes of keys.
const Size = 32
// Key represents a public or private key of FourQ.
type Key [Size]byte
// KeyGen calculates a public key k from a secret key.
func KeyGen(public, secret *Key) {
var P fourq.Point
P.ScalarBaseMult((*[Size]byte)(secret))
P.Marshal((*[Size]byte)(public))
}
// Shared calculates a shared key k from Alice's secret and Bob's public key.
// Returns true on success.
func Shared(shared, secret, public *Key) bool {
var P, Q fourq.Point
ok := P.Unmarshal((*[Size]byte)(public))
if !ok {
return false
}
Q.ScalarMult((*[Size]byte)(secret), &P)
Q.Marshal((*[Size]byte)(shared))
return !Q.IsIdentity() && Q.IsOnCurve()
}
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