Android Open Source - PasswordDroid Derivation Runnable Factory

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License

The source code is released under:

GNU General Public License

Java Source Code

package de.wuthoehle.passworddroid.crypto;
//from   w w w.  jav a2s  . c  om
/* Copyright (c) 2015 Marco Huenseler <marcoh.huenseler+git@gmail.com>
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;

import com.lambdaworks.crypto.SCrypt;

import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.security.GeneralSecurityException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import de.wuthoehle.passworddroid.crypto.SCryptParameters.SCryptParameters;
import de.wuthoehle.passworddroid.service.model.entries.DerivatorEntry;
import de.wuthoehle.passworddroid.service.model.entries.GetBundleVisitor;
import de.wuthoehle.passworddroid.service.model.entries.SaltVisitor;

public class DerivationRunnableFactory {

    public static final int MESSAGE_TYPE_STATUS = 0;
    public static final int MESSAGE_TYPE_DONE = 1;

    private byte[] master_key, salts;
    private SCryptParameters sCryptParameters;
    private Handler handler;

    public DerivationRunnableFactory(String master_key, List<String> salts,
                                     SCryptParameters sCryptParameters,
                                     Handler handler) throws GeneralSecurityException {
        try {
            this.master_key = master_key.getBytes("UTF-8");
            this.salts = Util.byteListToArray(Util.stringListToUtf8ByteList(salts));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            // This should actually never happen on Android >= 4
            // As the passwords have to be generated the same way on every device, we MUST encode
            // them in UTF-8. Otherwise, we can't calculate a password.
            throw new GeneralSecurityException("PasswordDerivationTask: No UTF-8!");
        }
        this.sCryptParameters = sCryptParameters;
        this.handler = handler;
    }

    public Runnable getRunnable(final int id, final DerivatorEntry... jobs) {
        return new Runnable() {
            @Override
            public void run() {
                ArrayList<String> result = new ArrayList<>();
                Bundle msgStatusBundle;
                for (DerivatorEntry entry : jobs) {
                    // Generate final salt
                    try {
                        SaltVisitor visitor = new SaltVisitor();
                        entry.accept(visitor);
                        byte[] additional_salts = visitor.getSalts();
                        byte[] all_salts = ByteBuffer.allocate(salts.length + additional_salts.length)
                                .put(salts).put(additional_salts).array();
                        // TODO Use counter, username, ...

                        byte[] scrypt_seed = SCrypt.scrypt(master_key, all_salts,
                                sCryptParameters.getN(), sCryptParameters.getR(),
                                sCryptParameters.getP(), sCryptParameters.getLen());

                        AESprng prng = new AESprng(
                                Arrays.copyOfRange(scrypt_seed, 0, 32),
                                Arrays.copyOfRange(scrypt_seed, 32, 40)
                        );

                        GetBundleVisitor bundleVisitor = new GetBundleVisitor();
                        entry.accept(bundleVisitor);
                        Bundle passwordProps = bundleVisitor.getBundle();
                        String characters = passwordProps.getString(GetBundleVisitor.ID_PW_ALL_CHARACTERS);
                        String password = "";
                        int rand = 0;
                        for (int i = 0; i < passwordProps.getInt(GetBundleVisitor.ID_PW_LENGTH); i++) {
                            do {
                                rand = prng.getInteger(AESprng.bitsForRange(characters.length()));
                            } while (rand >= characters.length());
                            password += characters.substring(rand, rand + 1);
                        }

                        result.add(password);
                        msgStatusBundle = new Bundle();
                        msgStatusBundle.putInt("id", id);
                        msgStatusBundle.putInt("type", MESSAGE_TYPE_STATUS);
                        msgStatusBundle.putInt("done", result.size());
                        msgStatusBundle.putInt("total", jobs.length);
                        sendMessage(msgStatusBundle);
                    } catch (GeneralSecurityException e) {
                        e.printStackTrace();
                    } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                    }
                }
                // Send results to the calling thread
                msgStatusBundle = new Bundle();
                msgStatusBundle.putInt("id", id);
                msgStatusBundle.putInt("type", MESSAGE_TYPE_DONE);
                msgStatusBundle.putStringArrayList("passwordList", result);
                sendMessage(msgStatusBundle);
            }
        };
    }

    private void sendMessage(Bundle content) {
        Message msgPasswordStatus = handler.obtainMessage();
        msgPasswordStatus.setData(content);
        handler.sendMessage(msgPasswordStatus);
    }
}

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