org.whispersystems.libsignal.protocol.SignalMessage Maven / Gradle / Ivy

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

import org.signal.client.internal.Native;
import org.whispersystems.libsignal.IdentityKey;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.InvalidMessageException;
import org.whispersystems.libsignal.LegacyMessageException;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.util.ByteUtil;

import javax.crypto.spec.SecretKeySpec;

public class SignalMessage implements CiphertextMessage {
  private final long handle;

  @Override
  protected void finalize() {
     Native.SignalMessage_Destroy(this.handle);
  }

  public SignalMessage(byte[] serialized) throws InvalidMessageException, LegacyMessageException {
    handle = Native.SignalMessage_Deserialize(serialized);
  }

  public SignalMessage(long handle) {
    this.handle = handle;
  }

  public SignalMessage(int messageVersion, SecretKeySpec macKey, ECPublicKey senderRatchetKey,
                       int counter, int previousCounter, byte[] ciphertext,
                       IdentityKey senderIdentityKey,
                       IdentityKey receiverIdentityKey)
  {
    handle = Native.SignalMessage_New(messageVersion, macKey.getEncoded(), senderRatchetKey.nativeHandle(),
                 counter, previousCounter, ciphertext,
                 senderIdentityKey.getPublicKey().nativeHandle(),
                 receiverIdentityKey.getPublicKey().nativeHandle());
  }

  public ECPublicKey getSenderRatchetKey()  {
    return new ECPublicKey(Native.SignalMessage_GetSenderRatchetKey(this.handle));
  }

  public int getMessageVersion() {
    return Native.SignalMessage_GetMessageVersion(this.handle);
  }

  public int getCounter() {
    return Native.SignalMessage_GetCounter(this.handle);
  }

  public byte[] getBody() {
    return Native.SignalMessage_GetBody(this.handle);
  }

  public void verifyMac(IdentityKey senderIdentityKey, IdentityKey receiverIdentityKey, SecretKeySpec macKey)
      throws InvalidMessageException
  {
    if(!Native.SignalMessage_VerifyMac(this.handle,
                  senderIdentityKey.getPublicKey().nativeHandle(),
                  receiverIdentityKey.getPublicKey().nativeHandle(),
                  macKey.getEncoded())) {
      throw new InvalidMessageException("Bad Mac!");
    }
  }

  @Override
  public byte[] serialize() {
    return Native.SignalMessage_GetSerialized(this.handle);
  }

  @Override
  public int getType() {
    return CiphertextMessage.WHISPER_TYPE;
  }

  public long nativeHandle() {
    return this.handle;
  }

  public static boolean isLegacy(byte[] message) {
    return message != null && message.length >= 1 &&
        ByteUtil.highBitsToInt(message[0]) != CiphertextMessage.CURRENT_VERSION;
  }

}