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Signal Protocol cryptography library for Java

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/**
 * Copyright (C) 2013-2016 Open Whisper Systems
 *
 * Licensed according to the LICENSE file in this repository.
 */

package org.whispersystems.libsignal.ecc;

import org.signal.client.internal.Native;
import org.signal.client.internal.NativeHandleGuard;

public class ECPrivateKey implements NativeHandleGuard.Owner {
  private final long unsafeHandle;

  static ECPrivateKey generate() {
    return new ECPrivateKey(Native.ECPrivateKey_Generate());
  }

  ECPrivateKey(byte[] privateKey) {
    this.unsafeHandle = Native.ECPrivateKey_Deserialize(privateKey);
  }

  public ECPrivateKey(long nativeHandle) {
    if(nativeHandle == 0) {
      throw new NullPointerException();
    }
    this.unsafeHandle = nativeHandle;
  }

  @Override
  protected void finalize() {
     Native.ECPrivateKey_Destroy(this.unsafeHandle);
  }

  public byte[] serialize() {
    try (NativeHandleGuard guard = new NativeHandleGuard(this)) {
      return Native.ECPrivateKey_Serialize(guard.nativeHandle());
    }
  }

  public byte[] calculateSignature(byte[] message) {
    try (NativeHandleGuard guard = new NativeHandleGuard(this)) {
      return Native.ECPrivateKey_Sign(guard.nativeHandle(), message);
    }
  }

  public byte[] calculateAgreement(ECPublicKey other) {
    try (
      NativeHandleGuard privateKey = new NativeHandleGuard(this);
      NativeHandleGuard publicKey = new NativeHandleGuard(other);
    ) {
      return Native.ECPrivateKey_Agree(privateKey.nativeHandle(), publicKey.nativeHandle());
    }
  }

  public long unsafeNativeHandleWithoutGuard() {
    return this.unsafeHandle;
  }

  public ECPublicKey publicKey() {
    try (NativeHandleGuard guard = new NativeHandleGuard(this)) {
      return new ECPublicKey(Native.ECPrivateKey_GetPublicKey(guard.nativeHandle()));
    }
  }
}