Android Open Source - conceal System Native Crypto Library

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License

The source code is released under:

BSD License For Conceal software Copyright (c) 2014, Facebook, Inc. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that...

Java Source Code

/*
 *  Copyright (c) 2014, Facebook, Inc./* www. ja  v  a  2 s . c  o  m*/
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 *
 */

package com.facebook.crypto.util;

import java.util.ArrayList;

import com.facebook.crypto.exception.CryptoInitializationException;

/**
 * An implementation of {@link NativeCryptoLibrary} that uses
 * {@link System#loadLibrary(String)} to load the crypto libraries.
 */
public class SystemNativeCryptoLibrary implements NativeCryptoLibrary {

  private static final ArrayList<String> LIBS = new ArrayList<String>() {{
    add("cryptox");
    add("conceal");
  }};

  private boolean mLoadLibraries;
  private boolean mLibrariesLoaded;
  private volatile UnsatisfiedLinkError mLinkError;

  public SystemNativeCryptoLibrary() {
    mLoadLibraries = true;
    mLibrariesLoaded = false;
    mLinkError = null;
  }

  @Override
  public synchronized void ensureCryptoLoaded() throws CryptoInitializationException {
    if (!loadLibraries()) {
      throw new CryptoInitializationException(mLinkError);
    }
  }

  private synchronized boolean loadLibraries() {
    if (!mLoadLibraries) {
      return mLibrariesLoaded;
    }
    try {
      for (String name : LIBS) {
        System.loadLibrary(name);
      }
      mLibrariesLoaded = true;
    } catch (UnsatisfiedLinkError error) {
      mLinkError = error;
      mLibrariesLoaded = false;
    }
    mLoadLibraries = false;
    return mLibrariesLoaded;
  }
}

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