1package eu.siacs.conversations.utils;
 2
 3import java.io.DataInputStream;
 4import java.io.DataOutputStream;
 5import java.io.IOException;
 6import java.util.Arrays;
 7
 8import rocks.xmpp.addr.Jid;
 9
10public class BackupFileHeader {
11
12    private static final int VERSION = 1;
13
14    private String app;
15    private Jid jid;
16    private long timestamp;
17    private byte[] iv;
18    private byte[] salt;
19
20
21    @Override
22    public String toString() {
23        return "BackupFileHeader{" +
24                "app='" + app + '\'' +
25                ", jid=" + jid +
26                ", timestamp=" + timestamp +
27                ", iv=" + CryptoHelper.bytesToHex(iv) +
28                ", salt=" + CryptoHelper.bytesToHex(salt) +
29                '}';
30    }
31
32    public BackupFileHeader(String app, Jid jid, long timestamp, byte[] iv, byte[] salt) {
33        this.app = app;
34        this.jid = jid;
35        this.timestamp = timestamp;
36        this.iv = iv;
37        this.salt = salt;
38    }
39
40    public void write(DataOutputStream dataOutputStream) throws IOException {
41        dataOutputStream.writeInt(VERSION);
42        dataOutputStream.writeUTF(app);
43        dataOutputStream.writeUTF(jid.asBareJid().toEscapedString());
44        dataOutputStream.writeLong(timestamp);
45        dataOutputStream.write(iv);
46        dataOutputStream.write(salt);
47    }
48
49    public static BackupFileHeader read(DataInputStream inputStream) throws IOException {
50        final int version = inputStream.readInt();
51        if (version > VERSION) {
52            throw new IllegalArgumentException("Backup File version was " + version + " but app only supports up to version " + VERSION);
53        }
54        String app = inputStream.readUTF();
55        String jid = inputStream.readUTF();
56        long timestamp = inputStream.readLong();
57        byte[] iv = new byte[12];
58        inputStream.readFully(iv);
59        byte[] salt = new byte[16];
60        inputStream.readFully(salt);
61
62        return new BackupFileHeader(app, Jid.of(jid), timestamp, iv, salt);
63
64    }
65
66    public byte[] getSalt() {
67        return salt;
68    }
69
70    public byte[] getIv() {
71        return iv;
72    }
73
74    public Jid getJid() {
75        return jid;
76    }
77
78    public String getApp() {
79        return app;
80    }
81
82    public long getTimestamp() {
83        return timestamp;
84    }
85}