117 lines
3.8 KiB
Java
117 lines
3.8 KiB
Java
/*
|
|
* The MIT License
|
|
*
|
|
* Copyright 2016 Ahseya.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
package libKonogonka.xtsaes;
|
|
|
|
import net.jcip.annotations.NotThreadSafe;
|
|
import org.bouncycastle.crypto.BlockCipher;
|
|
import org.bouncycastle.crypto.CipherParameters;
|
|
import org.bouncycastle.crypto.DataLengthException;
|
|
import org.bouncycastle.crypto.params.KeyParameter;
|
|
|
|
import java.util.Objects;
|
|
import java.util.function.LongFunction;
|
|
|
|
/**
|
|
* XTS-AES implemented as a BlockCipher.
|
|
*
|
|
* @author Ahseya
|
|
*/
|
|
@NotThreadSafe
|
|
public class XTSAESBlockCipher implements BlockCipher {
|
|
|
|
private final XTSCore core;
|
|
private final int blockSize;
|
|
private final int dataUnitSize;
|
|
private long dataUnit;
|
|
private int index;
|
|
|
|
XTSAESBlockCipher(
|
|
XTSCore core,
|
|
int blockSize,
|
|
int dataUnitSize,
|
|
long dataUnit,
|
|
int index) {
|
|
|
|
this.core = Objects.requireNonNull(core, "core");
|
|
this.blockSize = blockSize;
|
|
this.dataUnitSize = dataUnitSize;
|
|
this.dataUnit = dataUnit;
|
|
this.index = index;
|
|
}
|
|
|
|
XTSAESBlockCipher(XTSCore core, LongFunction<byte[]> tweakValueFunction, int dataUnitSize) {
|
|
this(new XTSCore(new XTSTweak(tweakValueFunction)), core.getBlockSize(), dataUnitSize, 0, 0);
|
|
}
|
|
|
|
public XTSAESBlockCipher(boolean isDefault, LongFunction<byte[]> tweakValueFunction, int dataUnitSize) {
|
|
this(new XTSCore(isDefault), tweakValueFunction, dataUnitSize);
|
|
}
|
|
|
|
public XTSAESBlockCipher(boolean isDefault, int dataUnitSize) {
|
|
this(new XTSCore(isDefault), isDefault?XTSTweak::defaultTweakFunction:XTSTweak::nintTweakFunction, dataUnitSize);
|
|
}
|
|
|
|
@Override
|
|
public void init(boolean forEncryption, CipherParameters params) throws IllegalArgumentException {
|
|
if (params instanceof KeyParameter) {
|
|
core.init(forEncryption, (KeyParameter) params);
|
|
return;
|
|
}
|
|
throw new IllegalArgumentException("invalid params: " + params.getClass().getName());
|
|
}
|
|
|
|
@Override
|
|
public String getAlgorithmName() {
|
|
return core.getAlgorithmName();
|
|
}
|
|
|
|
@Override
|
|
public int getBlockSize() {
|
|
return blockSize;
|
|
}
|
|
|
|
@Override
|
|
public int processBlock(byte[] in, int inOff, byte[] out, int outOff)
|
|
throws DataLengthException, IllegalStateException {
|
|
|
|
if (index == 0) {
|
|
core.reset(dataUnit);
|
|
}
|
|
|
|
if ((index += blockSize) == dataUnitSize) {
|
|
dataUnit++;
|
|
index = 0;
|
|
}
|
|
|
|
return core.processBlock(in, inOff, out, outOff);
|
|
}
|
|
|
|
@Override
|
|
public void reset() {
|
|
index = 0;
|
|
dataUnit = 0;
|
|
}
|
|
}
|
|
// TODO consider passing initial data unit sequence number in addition to key via CipherParameters subclass
|