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.Pair; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.util.concurrent.atomic.AtomicLong; import javax.crypto.Cipher; import javax.crypto.CipherInputStream; import javax.crypto.CipherOutputStream; 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; import eu.siacs.conversations.utils.Compatibility; public class AbstractConnectionManager { private static final String KEYTYPE = "AES"; private static final String CIPHERMODE = "AES/GCM/NoPadding"; private static final String PROVIDER = "BC"; private static final int UI_REFRESH_THRESHOLD = 250; private static final AtomicLong LAST_UI_UPDATE_CALL = new AtomicLong(0); protected XmppConnectionService mXmppConnectionService; public AbstractConnectionManager(XmppConnectionService service) { this.mXmppConnectionService = service; } 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) { Cipher cipher = Compatibility.twentyTwo() ? Cipher.getInstance(CIPHERMODE) : Cipher.getInstance(CIPHERMODE, PROVIDER); SecretKeySpec keySpec = new SecretKeySpec(file.getKey(), KEYTYPE); IvParameterSpec ivSpec = new IvParameterSpec(file.getIv()); cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec); return new Pair<>(new CipherInputStream(is, cipher), 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(), KEYTYPE), ips); return new Pair<>(new CipherInputStream(is, cipher), (size / 16 + 1) * 16); } } catch (Exception e) { throw new AssertionError(e); } } 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) { Cipher cipher = Compatibility.twentyTwo() ? Cipher.getInstance(CIPHERMODE) : Cipher.getInstance(CIPHERMODE, PROVIDER); SecretKeySpec keySpec = new SecretKeySpec(file.getKey(), KEYTYPE); IvParameterSpec ivSpec = new IvParameterSpec(file.getIv()); cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec); return new 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(), KEYTYPE), ips); return new CipherOutputStream(os, cipher); } } catch (Exception e) { throw new AssertionError(e); } } 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() { return Compatibility.hasStoragePermission(mXmppConnectionService); } 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); } }