mirror of
https://github.com/vanitasvitae/Smack.git
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219 lines
7.3 KiB
Java
219 lines
7.3 KiB
Java
/**
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*
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* Copyright 2017 Paul Schaub
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*
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* This file is part of smack-omemo-signal.
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*
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* smack-omemo-signal 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, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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package org.jivesoftware.smackx.omemo.signal;
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import java.io.IOException;
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import java.util.List;
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import java.util.TreeMap;
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import org.jivesoftware.smackx.omemo.element.OmemoBundleElement;
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import org.jivesoftware.smackx.omemo.exceptions.CorruptedOmemoKeyException;
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import org.jivesoftware.smackx.omemo.internal.OmemoDevice;
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import org.jivesoftware.smackx.omemo.trust.OmemoFingerprint;
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import org.jivesoftware.smackx.omemo.util.OmemoKeyUtil;
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import org.whispersystems.libsignal.IdentityKey;
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import org.whispersystems.libsignal.IdentityKeyPair;
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import org.whispersystems.libsignal.InvalidKeyException;
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import org.whispersystems.libsignal.ecc.Curve;
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import org.whispersystems.libsignal.ecc.ECPublicKey;
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import org.whispersystems.libsignal.state.PreKeyBundle;
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import org.whispersystems.libsignal.state.PreKeyRecord;
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import org.whispersystems.libsignal.state.SessionRecord;
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import org.whispersystems.libsignal.state.SignedPreKeyRecord;
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import org.whispersystems.libsignal.util.KeyHelper;
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/**
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* Concrete implementation of the KeyUtil for an implementation using the Signal library.
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*
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* @author Paul Schaub
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*/
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public class SignalOmemoKeyUtil extends OmemoKeyUtil<IdentityKeyPair, IdentityKey, PreKeyRecord, SignedPreKeyRecord,
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SessionRecord, ECPublicKey, PreKeyBundle> {
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@Override
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public IdentityKeyPair generateOmemoIdentityKeyPair() {
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return KeyHelper.generateIdentityKeyPair();
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}
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@Override
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public TreeMap<Integer, PreKeyRecord> generateOmemoPreKeys(int currentPreKeyId, int count) {
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List<PreKeyRecord> preKeyRecords = KeyHelper.generatePreKeys(currentPreKeyId, count);
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TreeMap<Integer, PreKeyRecord> map = new TreeMap<>();
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for (PreKeyRecord p : preKeyRecords) {
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map.put(p.getId(), p);
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}
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return map;
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}
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@Override
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public SignedPreKeyRecord generateOmemoSignedPreKey(IdentityKeyPair identityKeyPair, int currentPreKeyId)
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throws CorruptedOmemoKeyException {
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try {
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return KeyHelper.generateSignedPreKey(identityKeyPair, currentPreKeyId);
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} catch (InvalidKeyException e) {
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throw new CorruptedOmemoKeyException(e);
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}
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}
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@Override
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public SignedPreKeyRecord signedPreKeyFromBytes(byte[] data) throws IOException {
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if (data == null) return null;
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return new SignedPreKeyRecord(data);
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}
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@Override
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public byte[] signedPreKeyToBytes(SignedPreKeyRecord signedPreKeyRecord) {
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return signedPreKeyRecord.serialize();
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}
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@Override
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public SessionRecord rawSessionFromBytes(byte[] data) throws IOException {
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if (data == null) return null;
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return new SessionRecord(data);
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}
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@Override
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public byte[] rawSessionToBytes(SessionRecord session) {
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return session.serialize();
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}
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@Override
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public IdentityKeyPair identityKeyPairFromBytes(byte[] data) throws CorruptedOmemoKeyException {
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if (data == null) return null;
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try {
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return new IdentityKeyPair(data);
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} catch (InvalidKeyException e) {
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throw new CorruptedOmemoKeyException(e);
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}
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}
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@Override
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public IdentityKey identityKeyFromBytes(byte[] data) throws CorruptedOmemoKeyException {
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if (data == null) return null;
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try {
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return new IdentityKey(data, 0);
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} catch (InvalidKeyException e) {
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throw new CorruptedOmemoKeyException(e);
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}
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}
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@Override
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public ECPublicKey ellipticCurvePublicKeyFromBytes(byte[] data) throws CorruptedOmemoKeyException {
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if (data == null) return null;
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try {
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return Curve.decodePoint(data, 0);
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} catch (InvalidKeyException e) {
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throw new CorruptedOmemoKeyException(e);
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}
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}
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@Override
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public byte[] preKeyToBytes(PreKeyRecord preKeyRecord) {
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return preKeyRecord.serialize();
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}
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@Override
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public PreKeyRecord preKeyFromBytes(byte[] bytes) throws IOException {
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if (bytes == null) return null;
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return new PreKeyRecord(bytes);
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}
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@Override
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public PreKeyBundle bundleFromOmemoBundle(OmemoBundleElement bundle, OmemoDevice contact, int preKeyId)
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throws CorruptedOmemoKeyException {
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return new PreKeyBundle(0,
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contact.getDeviceId(),
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preKeyId,
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BUNDLE.preKeyPublic(bundle, preKeyId),
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BUNDLE.signedPreKeyId(bundle),
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BUNDLE.signedPreKeyPublic(bundle),
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BUNDLE.signedPreKeySignature(bundle),
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BUNDLE.identityKey(bundle));
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}
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@Override
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public byte[] signedPreKeySignatureFromKey(SignedPreKeyRecord signedPreKey) {
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return signedPreKey.getSignature();
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}
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@Override
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public int signedPreKeyIdFromKey(SignedPreKeyRecord signedPreKey) {
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return signedPreKey.getId();
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}
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@Override
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public byte[] identityKeyPairToBytes(IdentityKeyPair identityKeyPair) {
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return identityKeyPair.serialize();
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}
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@Override
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public IdentityKey identityKeyFromPair(IdentityKeyPair identityKeyPair) {
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return identityKeyPair.getPublicKey();
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}
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@Override
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public byte[] identityKeyForBundle(IdentityKey identityKey) {
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return identityKey.getPublicKey().serialize();
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}
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@Override
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public byte[] identityKeyToBytes(IdentityKey identityKey) {
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return identityKey.serialize();
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}
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@Override
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public byte[] preKeyPublicKeyForBundle(ECPublicKey preKey) {
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return preKey.serialize();
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}
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@Override
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public byte[] preKeyForBundle(PreKeyRecord preKeyRecord) {
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return preKeyRecord.getKeyPair().getPublicKey().serialize();
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}
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@Override
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public byte[] signedPreKeyPublicForBundle(SignedPreKeyRecord signedPreKey) {
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return signedPreKey.getKeyPair().getPublicKey().serialize();
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}
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@Override
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public OmemoFingerprint getFingerprintOfIdentityKey(IdentityKey identityKey) {
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if (identityKey == null) {
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return null;
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}
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String fp = identityKey.getFingerprint();
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// Cut "(byte)0x" prefixes, remove spaces and commas, cut first two digits.
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fp = fp.replace("(byte)0x", "").replace(",", "")
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.replace(" ", "").substring(2);
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return new OmemoFingerprint(fp);
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}
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@Override
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public OmemoFingerprint getFingerprintOfIdentityKeyPair(IdentityKeyPair identityKeyPair) {
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if (identityKeyPair == null) {
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return null;
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}
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return getFingerprintOfIdentityKey(identityKeyPair.getPublicKey());
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}
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}
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