toad.city
That fuck shit the fascists are using
1/**
2 * Copyright (C) 2011 Whisper Systems
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17package org.tm.archive.crypto;
18
19import android.os.Parcel;
20import android.os.Parcelable;
21
22import java.util.Arrays;
23
24import javax.crypto.spec.SecretKeySpec;
25
26/**
27 * When a user first initializes TextSecure, a few secrets
28 * are generated. These are:
29 *
30 * 1) A 128bit symmetric encryption key.
31 * 2) A 160bit symmetric MAC key.
32 * 3) An ECC keypair.
33 *
34 * The first two, along with the ECC keypair's private key, are
35 * then encrypted on disk using PBE.
36 *
37 * This class represents 1 and 2.
38 *
39 * @author Moxie Marlinspike
40 */
41
42public class MasterSecret implements Parcelable {
43
44 private final SecretKeySpec encryptionKey;
45 private final SecretKeySpec macKey;
46
47 public static final Parcelable.Creator<MasterSecret> CREATOR = new Parcelable.Creator<MasterSecret>() {
48 @Override
49 public MasterSecret createFromParcel(Parcel in) {
50 return new MasterSecret(in);
51 }
52
53 @Override
54 public MasterSecret[] newArray(int size) {
55 return new MasterSecret[size];
56 }
57 };
58
59 public MasterSecret(SecretKeySpec encryptionKey, SecretKeySpec macKey) {
60 this.encryptionKey = encryptionKey;
61 this.macKey = macKey;
62 }
63
64 private MasterSecret(Parcel in) {
65 byte[] encryptionKeyBytes = new byte[in.readInt()];
66 in.readByteArray(encryptionKeyBytes);
67
68 byte[] macKeyBytes = new byte[in.readInt()];
69 in.readByteArray(macKeyBytes);
70
71 this.encryptionKey = new SecretKeySpec(encryptionKeyBytes, "AES");
72 this.macKey = new SecretKeySpec(macKeyBytes, "HmacSHA1");
73
74 // SecretKeySpec does an internal copy in its constructor.
75 Arrays.fill(encryptionKeyBytes, (byte) 0x00);
76 Arrays.fill(macKeyBytes, (byte)0x00);
77 }
78
79
80 public SecretKeySpec getEncryptionKey() {
81 return this.encryptionKey;
82 }
83
84 public SecretKeySpec getMacKey() {
85 return this.macKey;
86 }
87
88 @Override
89 public void writeToParcel(Parcel out, int flags) {
90 out.writeInt(encryptionKey.getEncoded().length);
91 out.writeByteArray(encryptionKey.getEncoded());
92 out.writeInt(macKey.getEncoded().length);
93 out.writeByteArray(macKey.getEncoded());
94 }
95
96 @Override
97 public int describeContents() {
98 return 0;
99 }
100
101 public MasterSecret parcelClone() {
102 Parcel thisParcel = Parcel.obtain();
103 Parcel thatParcel = Parcel.obtain();
104 byte[] bytes = null;
105
106 thisParcel.writeValue(this);
107 bytes = thisParcel.marshall();
108
109 thatParcel.unmarshall(bytes, 0, bytes.length);
110 thatParcel.setDataPosition(0);
111
112 MasterSecret that = (MasterSecret)thatParcel.readValue(MasterSecret.class.getClassLoader());
113
114 thisParcel.recycle();
115 thatParcel.recycle();
116
117 return that;
118 }
119
120}