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Curve25519 library for Java

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/**
 * Copyright (C) 2014-2016 Open Whisper Systems
 * 
 * Licensed according to the LICENSE file in this repository.
 */

package org.whispersystems.curve25519;

public interface Curve25519Provider {

    static final int PRIVATE_KEY_LEN = 32;

    boolean isNative();

    byte[] calculateAgreement(byte[] ourPrivate, byte[] theirPublic);

    byte[] generatePublicKey(byte[] privateKey);

    byte[] generatePrivateKey();

    byte[] generatePrivateKey(byte[] random);

    byte[] calculateSignature(byte[] random, byte[] privateKey, byte[] message);

    boolean verifySignature(byte[] publicKey, byte[] message, byte[] signature);

    byte[] calculateVrfSignature(byte[] random, byte[] privateKey, byte[] message);

    byte[] verifyVrfSignature(byte[] publicKey, byte[] message, byte[] signature)
            throws VrfSignatureVerificationFailedException;

    byte[] getRandom(int length);

    void setRandomProvider(SecureRandomProvider provider);

}