sshkey_ec_validate_public
if (sshkey_ec_validate_public(group, dh_pub) != 0) {
if (sshkey_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
int sshkey_ec_validate_public(const EC_GROUP *, const EC_POINT *);