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The source code is released under:
GNU General Public License
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/* * Copyright 2014 the original author or authors. *//from w w w . j ava 2s . com * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package de.schildbach.wallet.ui.send; import javax.annotation.Nonnull; import org.bitcoinj.crypto.KeyCrypter; import org.spongycastle.crypto.params.KeyParameter; import android.os.Handler; import android.os.Looper; /** * @author Andreas Schildbach */ public abstract class DeriveKeyTask { private final Handler backgroundHandler; private final Handler callbackHandler; public DeriveKeyTask(@Nonnull final Handler backgroundHandler) { this.backgroundHandler = backgroundHandler; this.callbackHandler = new Handler(Looper.myLooper()); } public final void deriveKey(@Nonnull final KeyCrypter keyCrypter, @Nonnull final String password) { backgroundHandler.post(new Runnable() { @Override public void run() { final KeyParameter encryptionKey = keyCrypter.deriveKey(password); // takes time callbackHandler.post(new Runnable() { @Override public void run() { onSuccess(encryptionKey); } }); } }); } protected abstract void onSuccess(@Nonnull KeyParameter encryptionKey); }