package eu.siacs.conversations.services; import android.Manifest; import android.content.Context; import android.content.pm.PackageManager; import android.os.Build; import android.os.PowerManager; import android.os.SystemClock; import android.util.Log; import android.util.Pair; import org.bouncycastle.crypto.engines.AESEngine; import org.bouncycastle.crypto.modes.AEADBlockCipher; import org.bouncycastle.crypto.modes.GCMBlockCipher; import org.bouncycastle.crypto.params.AEADParameters; import org.bouncycastle.crypto.params.KeyParameter; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.security.InvalidAlgorithmParameterException; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.util.concurrent.atomic.AtomicLong; import javax.crypto.Cipher; import javax.crypto.CipherInputStream; import javax.crypto.CipherOutputStream; import javax.crypto.NoSuchPaddingException; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; import eu.siacs.conversations.Config; import eu.siacs.conversations.R; import eu.siacs.conversations.entities.DownloadableFile; public class AbstractConnectionManager { protected XmppConnectionService mXmppConnectionService; private static final int UI_REFRESH_THRESHOLD = 250; private static final AtomicLong LAST_UI_UPDATE_CALL = new AtomicLong(0); public AbstractConnectionManager(XmppConnectionService service) { this.mXmppConnectionService = service; } public XmppConnectionService getXmppConnectionService() { return this.mXmppConnectionService; } public long getAutoAcceptFileSize() { return this.mXmppConnectionService.getLongPreference("auto_accept_file_size",R.integer.auto_accept_filesize); } public boolean hasStoragePermission() { if (!Config.ONLY_INTERNAL_STORAGE && Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { return mXmppConnectionService.checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED; } else { return true; } } public static Pair createInputStream(DownloadableFile file, boolean gcm) throws FileNotFoundException { FileInputStream is; int size; is = new FileInputStream(file); size = (int) file.getSize(); if (file.getKey() == null) { return new Pair(is,size); } try { if (gcm) { AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine()); cipher.init(true, new AEADParameters(new KeyParameter(file.getKey()), 128, file.getIv())); InputStream cis = new org.bouncycastle.crypto.io.CipherInputStream(is, cipher); return new Pair<>(cis, cipher.getOutputSize(size)); } else { IvParameterSpec ips = new IvParameterSpec(file.getIv()); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(file.getKey(), "AES"), ips); Log.d(Config.LOGTAG, "opening encrypted input stream"); return new Pair(new CipherInputStream(is, cipher),(size / 16 + 1) * 16); } } catch (InvalidKeyException e) { return null; } catch (NoSuchAlgorithmException e) { return null; } catch (NoSuchPaddingException e) { return null; } catch (InvalidAlgorithmParameterException e) { return null; } } public static OutputStream createAppendedOutputStream(DownloadableFile file) { return createOutputStream(file, false, true); } public static OutputStream createOutputStream(DownloadableFile file, boolean gcm) { return createOutputStream(file, gcm, false); } private static OutputStream createOutputStream(DownloadableFile file, boolean gcm, boolean append) { FileOutputStream os; try { os = new FileOutputStream(file, append); if (file.getKey() == null) { return os; } } catch (FileNotFoundException e) { return null; } try { if (gcm) { AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine()); cipher.init(false, new AEADParameters(new KeyParameter(file.getKey()), 128, file.getIv())); return new org.bouncycastle.crypto.io.CipherOutputStream(os, cipher); } else { IvParameterSpec ips = new IvParameterSpec(file.getIv()); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(file.getKey(), "AES"), ips); Log.d(Config.LOGTAG, "opening encrypted output stream"); return new CipherOutputStream(os, cipher); } } catch (InvalidKeyException e) { return null; } catch (NoSuchAlgorithmException e) { return null; } catch (NoSuchPaddingException e) { return null; } catch (InvalidAlgorithmParameterException e) { return null; } } public void updateConversationUi(boolean force) { synchronized (LAST_UI_UPDATE_CALL) { if (force || SystemClock.elapsedRealtime() - LAST_UI_UPDATE_CALL.get() >= UI_REFRESH_THRESHOLD) { LAST_UI_UPDATE_CALL.set(SystemClock.elapsedRealtime()); mXmppConnectionService.updateConversationUi(); } } } public PowerManager.WakeLock createWakeLock(String name) { PowerManager powerManager = (PowerManager) mXmppConnectionService.getSystemService(Context.POWER_SERVICE); return powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,name); } }