// Extract the Curve public key from the Key record
func (k *RR_DNSKEY) pubKeyCurve() *ecdsa.PublicKey {
keybuf, err := packBase64([]byte(k.PublicKey))
if err != nil {
return nil
}
var c *elliptic.Curve
switch k.Algorithm {
case ECDSAP256SHA256:
c = elliptic.P256()
case ECDSAP384SHA384:
c = elliptic.P384()
}
x, y := c.Unmarshal(keybuf)
pubkey := new(ecdsa.PublicKey)
pubkey.X = x
pubkey.Y = y
pubkey.Curve = c
return pubkey
}