/*
* Syncany, www.syncany.org
* Copyright (C) 2011-2014 Philipp C. Heckel <philipp.heckel@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.syncany.crypto.specs;
import java.io.InputStream;
import java.io.OutputStream;
import org.bouncycastle.crypto.engines.TwofishEngine;
import org.bouncycastle.crypto.modes.AEADBlockCipher;
import org.bouncycastle.crypto.modes.GCMBlockCipher;
import org.bouncycastle.crypto.params.AEADParameters;
import org.bouncycastle.crypto.params.KeyParameter;
import org.syncany.crypto.CipherException;
import org.syncany.crypto.CipherSpec;
public abstract class TwofishGcmCipherSpec extends CipherSpec {
private static final int MAC_SIZE = 128;
public TwofishGcmCipherSpec(int id, String algorithm, int keySize, int ivSize, boolean needsUnlimitedStrength) {
super(id, algorithm, keySize, ivSize, needsUnlimitedStrength);
}
@Override
public OutputStream newCipherOutputStream(OutputStream underlyingOutputStream, byte[] secretKey, byte[] iv) throws CipherException {
AEADBlockCipher cipher = new GCMBlockCipher(new TwofishEngine());
cipher.init(true, new AEADParameters(new KeyParameter(secretKey), MAC_SIZE, iv));
return new org.bouncycastle.crypto.io.CipherOutputStream(underlyingOutputStream, cipher);
}
@Override
public InputStream newCipherInputStream(InputStream underlyingInputStream, byte[] secretKey, byte[] iv) throws CipherException {
AEADBlockCipher cipher = new GCMBlockCipher(new TwofishEngine());
cipher.init(false, new AEADParameters(new KeyParameter(secretKey), MAC_SIZE, iv));
return new org.bouncycastle.crypto.io.CipherInputStream(underlyingInputStream, cipher);
}
}