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Signal Protocol cryptography library for Java

There is a newer version: 2.8.1

/**
 * Copyright (C) 2014-2016 Open Whisper Systems
 *
 * Licensed according to the LICENSE file in this repository.
 */
package org.whispersystems.libsignal.protocol;

public interface CiphertextMessage {

  public static final int CURRENT_VERSION     = 3;

  public static final int WHISPER_TYPE                = 2;
  public static final int PREKEY_TYPE                 = 3;
  public static final int SENDERKEY_TYPE              = 4;
  public static final int SENDERKEY_DISTRIBUTION_TYPE = 5;

  // This should be the worst case (worse than V2).  So not always accurate, but good enough for padding.
  public static final int ENCRYPTED_MESSAGE_OVERHEAD = 53;

  public byte[] serialize();
  public int getType();

}