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Curve25519 library for Java

There is a newer version: 0.5.0

/**
 * Copyright (C) 2015 Open Whisper Systems
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.whispersystems.curve25519;

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[] getRandom(int length);

  void setRandomProvider(SecureRandomProvider provider);

}