1package eu.siacs.conversations.xmpp.jingle;
 2
 3import java.io.FileInputStream;
 4import java.io.FileNotFoundException;
 5import java.io.FileOutputStream;
 6import java.io.InputStream;
 7import java.io.OutputStream;
 8import java.security.InvalidAlgorithmParameterException;
 9import java.security.InvalidKeyException;
10import java.security.NoSuchAlgorithmException;
11
12import javax.crypto.Cipher;
13import javax.crypto.CipherOutputStream;
14import javax.crypto.CipherInputStream;
15import javax.crypto.NoSuchPaddingException;
16import javax.crypto.spec.IvParameterSpec;
17
18import eu.siacs.conversations.Config;
19
20import android.util.Log;
21
22public abstract class JingleTransport {
23	public abstract void connect(final OnTransportConnected callback);
24
25	public abstract void receive(final JingleFile file,
26			final OnFileTransmissionStatusChanged callback);
27
28	public abstract void send(final JingleFile file,
29			final OnFileTransmissionStatusChanged callback);
30
31	private byte[] iv = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
32			0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0xf };
33
34	protected InputStream getInputStream(JingleFile file)
35			throws FileNotFoundException {
36		if (file.getKey() == null) {
37			return new FileInputStream(file);
38		} else {
39			try {
40				IvParameterSpec ips = new IvParameterSpec(iv);
41				Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
42				cipher.init(Cipher.ENCRYPT_MODE, file.getKey(), ips);
43				Log.d(Config.LOGTAG, "opening encrypted input stream");
44				return new CipherInputStream(new FileInputStream(file), cipher);
45			} catch (NoSuchAlgorithmException e) {
46				Log.d(Config.LOGTAG, "no such algo: " + e.getMessage());
47				return null;
48			} catch (NoSuchPaddingException e) {
49				Log.d(Config.LOGTAG, "no such padding: " + e.getMessage());
50				return null;
51			} catch (InvalidKeyException e) {
52				Log.d(Config.LOGTAG, "invalid key: " + e.getMessage());
53				return null;
54			} catch (InvalidAlgorithmParameterException e) {
55				Log.d(Config.LOGTAG, "invavid iv:" + e.getMessage());
56				return null;
57			}
58		}
59	}
60
61	protected OutputStream getOutputStream(JingleFile file)
62			throws FileNotFoundException {
63		if (file.getKey() == null) {
64			return new FileOutputStream(file);
65		} else {
66			try {
67				IvParameterSpec ips = new IvParameterSpec(iv);
68				Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
69				cipher.init(Cipher.DECRYPT_MODE, file.getKey(), ips);
70				Log.d(Config.LOGTAG, "opening encrypted output stream");
71				return new CipherOutputStream(new FileOutputStream(file),
72						cipher);
73			} catch (NoSuchAlgorithmException e) {
74				Log.d(Config.LOGTAG, "no such algo: " + e.getMessage());
75				return null;
76			} catch (NoSuchPaddingException e) {
77				Log.d(Config.LOGTAG, "no such padding: " + e.getMessage());
78				return null;
79			} catch (InvalidKeyException e) {
80				Log.d(Config.LOGTAG, "invalid key: " + e.getMessage());
81				return null;
82			} catch (InvalidAlgorithmParameterException e) {
83				Log.d(Config.LOGTAG, "invavid iv:" + e.getMessage());
84				return null;
85			}
86		}
87	}
88}