1package eu.siacs.conversations.services;
2
3import android.content.Context;
4import android.os.PowerManager;
5import android.util.Log;
6import android.util.Pair;
7
8import org.bouncycastle.crypto.engines.AESEngine;
9import org.bouncycastle.crypto.modes.AEADBlockCipher;
10import org.bouncycastle.crypto.modes.GCMBlockCipher;
11import org.bouncycastle.crypto.params.AEADParameters;
12import org.bouncycastle.crypto.params.KeyParameter;
13
14import java.io.FileInputStream;
15import java.io.FileNotFoundException;
16import java.io.FileOutputStream;
17import java.io.InputStream;
18import java.io.OutputStream;
19import java.security.InvalidAlgorithmParameterException;
20import java.security.InvalidKeyException;
21import java.security.NoSuchAlgorithmException;
22
23import javax.crypto.Cipher;
24import javax.crypto.CipherInputStream;
25import javax.crypto.CipherOutputStream;
26import javax.crypto.NoSuchPaddingException;
27import javax.crypto.spec.IvParameterSpec;
28import javax.crypto.spec.SecretKeySpec;
29
30import eu.siacs.conversations.Config;
31import eu.siacs.conversations.entities.DownloadableFile;
32
33public class AbstractConnectionManager {
34 protected XmppConnectionService mXmppConnectionService;
35
36 public AbstractConnectionManager(XmppConnectionService service) {
37 this.mXmppConnectionService = service;
38 }
39
40 public XmppConnectionService getXmppConnectionService() {
41 return this.mXmppConnectionService;
42 }
43
44 public long getAutoAcceptFileSize() {
45 String config = this.mXmppConnectionService.getPreferences().getString(
46 "auto_accept_file_size", "524288");
47 try {
48 return Long.parseLong(config);
49 } catch (NumberFormatException e) {
50 return 524288;
51 }
52 }
53
54 public static Pair<InputStream,Integer> createInputStream(DownloadableFile file, boolean gcm) throws FileNotFoundException {
55 FileInputStream is;
56 int size;
57 is = new FileInputStream(file);
58 size = (int) file.getSize();
59 if (file.getKey() == null) {
60 return new Pair<InputStream,Integer>(is,size);
61 }
62 try {
63 if (gcm) {
64 AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
65 cipher.init(true, new AEADParameters(new KeyParameter(file.getKey()), 128, file.getIv()));
66 InputStream cis = new org.bouncycastle.crypto.io.CipherInputStream(is, cipher);
67 return new Pair<>(cis, cipher.getOutputSize(size));
68 } else {
69 IvParameterSpec ips = new IvParameterSpec(file.getIv());
70 Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
71 cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(file.getKey(), "AES"), ips);
72 Log.d(Config.LOGTAG, "opening encrypted input stream");
73 final int s = Config.REPORT_WRONG_FILESIZE_IN_OTR_JINGLE ? size : (size / 16 + 1) * 16;
74 return new Pair<InputStream,Integer>(new CipherInputStream(is, cipher),s);
75 }
76 } catch (InvalidKeyException e) {
77 return null;
78 } catch (NoSuchAlgorithmException e) {
79 return null;
80 } catch (NoSuchPaddingException e) {
81 return null;
82 } catch (InvalidAlgorithmParameterException e) {
83 return null;
84 }
85 }
86
87 public static OutputStream createOutputStream(DownloadableFile file, boolean gcm) {
88 FileOutputStream os;
89 try {
90 os = new FileOutputStream(file);
91 if (file.getKey() == null) {
92 return os;
93 }
94 } catch (FileNotFoundException e) {
95 return null;
96 }
97 try {
98 if (gcm) {
99 AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
100 cipher.init(false, new AEADParameters(new KeyParameter(file.getKey()), 128, file.getIv()));
101 return new org.bouncycastle.crypto.io.CipherOutputStream(os, cipher);
102 } else {
103 IvParameterSpec ips = new IvParameterSpec(file.getIv());
104 Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
105 cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(file.getKey(), "AES"), ips);
106 Log.d(Config.LOGTAG, "opening encrypted output stream");
107 return new CipherOutputStream(os, cipher);
108 }
109 } catch (InvalidKeyException e) {
110 return null;
111 } catch (NoSuchAlgorithmException e) {
112 return null;
113 } catch (NoSuchPaddingException e) {
114 return null;
115 } catch (InvalidAlgorithmParameterException e) {
116 return null;
117 }
118 }
119
120 public PowerManager.WakeLock createWakeLock(String name) {
121 PowerManager powerManager = (PowerManager) mXmppConnectionService.getSystemService(Context.POWER_SERVICE);
122 return powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,name);
123 }
124}