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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.entities.DownloadableFile;
public class AbstractConnectionManager {
protected XmppConnectionService mXmppConnectionService;
public AbstractConnectionManager(XmppConnectionService service) {
this.mXmppConnectionService = service;
}
public XmppConnectionService getXmppConnectionService() {
return this.mXmppConnectionService;
}
public boolean hasStoragePermission() {
if (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<InputStream,Integer> 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<InputStream,Integer>(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<InputStream,Integer>(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;
}
}
public PowerManager.WakeLock createWakeLock(String name) {
PowerManager powerManager = (PowerManager) mXmppConnectionService.getSystemService(Context.POWER_SERVICE);
return powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,name);
}
}
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