b8f663b69c
1) Move all the crypto classes from securesms.crypto. 2) Move all the crypto storage from securesms.database.keys 3) Replace the old imported BC code with spongycastle.
119 lines
3.3 KiB
Java
119 lines
3.3 KiB
Java
/**
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* Copyright (C) 2011 Whisper Systems
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.whispersystems.textsecure.crypto;
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import android.os.Parcel;
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import android.os.Parcelable;
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import javax.crypto.spec.SecretKeySpec;
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import java.util.Arrays;
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/**
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* When a user first initializes TextSecure, a few secrets
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* are generated. These are:
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*
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* 1) A 128bit symmetric encryption key.
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* 2) A 160bit symmetric MAC key.
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* 3) An ECC keypair.
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*
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* The first two, along with the ECC keypair's private key, are
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* then encrypted on disk using PBE.
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*
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* This class represents 1 and 2.
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*
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* @author Moxie Marlinspike
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*/
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public class MasterSecret implements Parcelable {
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private final SecretKeySpec encryptionKey;
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private final SecretKeySpec macKey;
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public static final Parcelable.Creator<MasterSecret> CREATOR = new Parcelable.Creator<MasterSecret>() {
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@Override
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public MasterSecret createFromParcel(Parcel in) {
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return new MasterSecret(in);
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}
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@Override
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public MasterSecret[] newArray(int size) {
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return new MasterSecret[size];
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}
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};
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public MasterSecret(SecretKeySpec encryptionKey, SecretKeySpec macKey) {
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this.encryptionKey = encryptionKey;
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this.macKey = macKey;
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}
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private MasterSecret(Parcel in) {
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byte[] encryptionKeyBytes = new byte[in.readInt()];
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in.readByteArray(encryptionKeyBytes);
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byte[] macKeyBytes = new byte[in.readInt()];
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in.readByteArray(macKeyBytes);
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this.encryptionKey = new SecretKeySpec(encryptionKeyBytes, "AES");
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this.macKey = new SecretKeySpec(macKeyBytes, "HmacSHA1");
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// SecretKeySpec does an internal copy in its constructor.
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Arrays.fill(encryptionKeyBytes, (byte) 0x00);
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Arrays.fill(macKeyBytes, (byte)0x00);
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}
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public SecretKeySpec getEncryptionKey() {
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return this.encryptionKey;
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}
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public SecretKeySpec getMacKey() {
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return this.macKey;
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}
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@Override
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public void writeToParcel(Parcel out, int flags) {
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out.writeInt(encryptionKey.getEncoded().length);
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out.writeByteArray(encryptionKey.getEncoded());
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out.writeInt(macKey.getEncoded().length);
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out.writeByteArray(macKey.getEncoded());
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}
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@Override
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public int describeContents() {
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return 0;
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}
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public MasterSecret parcelClone() {
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Parcel thisParcel = Parcel.obtain();
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Parcel thatParcel = Parcel.obtain();
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byte[] bytes = null;
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thisParcel.writeValue(this);
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bytes = thisParcel.marshall();
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thatParcel.unmarshall(bytes, 0, bytes.length);
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thatParcel.setDataPosition(0);
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MasterSecret that = (MasterSecret)thatParcel.readValue(MasterSecret.class.getClassLoader());
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thisParcel.recycle();
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thatParcel.recycle();
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return that;
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}
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}
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