s390x_x448_mul
if (s390x_x448_mul(secret, peer->pubkey, priv->privkey) == 0) {
if (s390x_x448_mul(pubkey, generator, privkey) != 1)
&& s390x_x448_mul(key, pubkey, privkey) == 0))
int s390x_x448_mul(unsigned char u_dst[56],
if (s390x_x448_mul(pubkey, generator, privkey) != 1)