class Ecc25519Helper {

    public byte[] sign(byte[] message) {
        return signWithoutClamp(message, mKeyHolder.getPrivateKey(), mKeyHolder.getPublicKeySignature());
    }

    public  Ecc25519Helper();
    public  Ecc25519Helper(byte[] privateKey);
    public  Ecc25519Helper(KeyHolder keyHolder);

}