func ECDHSecret(our_priv ECDHPrivate, their_publ ECDHPublic) []byte {
toret := make([]byte, ECDHKeyLength)
C.crypto_scalarmult(
(*C.uchar)(&toret[0]),
(*C.uchar)(&our_priv[0]),
(*C.uchar)(&their_publ[0]))
return toret
}
func CryptoScalarMult(n []byte, p []byte) ([]byte, int) {
support.CheckSize(n, CryptoScalarmultScalarBytes(), "secret key")
support.CheckSize(p, CryptoScalarmultScalarBytes(), "public key")
q := make([]byte, CryptoScalarmultBytes())
var exit C.int
exit = C.crypto_scalarmult(
(*C.uchar)(&q[0]),
(*C.uchar)(&n[0]),
(*C.uchar)(&p[0]))
return q, int(exit)
}