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) {
55 FileInputStream is;
56 int size;
57 try {
58 is = new FileInputStream(file);
59 size = (int) file.getSize();
60 if (file.getKey() == null) {
61 return new Pair<InputStream,Integer>(is,size);
62 }
63 } catch (FileNotFoundException e) {
64 return null;
65 }
66 try {
67 if (gcm) {
68 AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
69 cipher.init(true, new AEADParameters(new KeyParameter(file.getKey()), 128, file.getIv()));
70 InputStream cis = new org.bouncycastle.crypto.io.CipherInputStream(is, cipher);
71 return new Pair<>(cis, cipher.getOutputSize(size));
72 } else {
73 IvParameterSpec ips = new IvParameterSpec(file.getIv());
74 Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
75 cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(file.getKey(), "AES"), ips);
76 Log.d(Config.LOGTAG, "opening encrypted input stream");
77 final int s = Config.REPORT_WRONG_FILESIZE_IN_OTR_JINGLE ? size : (size / 16 + 1) * 16;
78 return new Pair<InputStream,Integer>(new CipherInputStream(is, cipher),s);
79 }
80 } catch (InvalidKeyException e) {
81 return null;
82 } catch (NoSuchAlgorithmException e) {
83 return null;
84 } catch (NoSuchPaddingException e) {
85 return null;
86 } catch (InvalidAlgorithmParameterException e) {
87 return null;
88 }
89 }
90
91 public static OutputStream createOutputStream(DownloadableFile file, boolean gcm) {
92 FileOutputStream os;
93 try {
94 os = new FileOutputStream(file);
95 if (file.getKey() == null) {
96 return os;
97 }
98 } catch (FileNotFoundException e) {
99 return null;
100 }
101 try {
102 if (gcm) {
103 AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
104 cipher.init(false, new AEADParameters(new KeyParameter(file.getKey()), 128, file.getIv()));
105 return new org.bouncycastle.crypto.io.CipherOutputStream(os, cipher);
106 } else {
107 IvParameterSpec ips = new IvParameterSpec(file.getIv());
108 Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
109 cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(file.getKey(), "AES"), ips);
110 Log.d(Config.LOGTAG, "opening encrypted output stream");
111 return new CipherOutputStream(os, cipher);
112 }
113 } catch (InvalidKeyException e) {
114 return null;
115 } catch (NoSuchAlgorithmException e) {
116 return null;
117 } catch (NoSuchPaddingException e) {
118 return null;
119 } catch (InvalidAlgorithmParameterException e) {
120 return null;
121 }
122 }
123
124 public PowerManager.WakeLock createWakeLock(String name) {
125 PowerManager powerManager = (PowerManager) mXmppConnectionService.getSystemService(Context.POWER_SERVICE);
126 return powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,name);
127 }
128}