package de.thedevstack.conversationsplus.services; import android.Manifest; import android.content.Context; import android.content.pm.PackageManager; import android.os.Build; import android.os.PowerManager; 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 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 de.thedevstack.conversationsplus.Config; import de.thedevstack.conversationsplus.ConversationsPlusApplication; import de.thedevstack.conversationsplus.entities.DownloadableFile; public class AbstractConnectionManager { public boolean hasStoragePermission() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { return ConversationsPlusApplication.getAppContext().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"); final int s = Config.REPORT_WRONG_FILESIZE_IN_OTR_JINGLE ? size : (size / 16 + 1) * 16; return new Pair(new CipherInputStream(is, cipher),s); } } 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; } } }