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Add xtea utility, using bouncycastle xtea implementation

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Adam
2016-06-10 17:28:18 -04:00
parent 24754772f6
commit ca1433f6a5
2 changed files with 168 additions and 0 deletions
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107
cache/src/main/java/net/runelite/cache/fs/util/Xtea.java vendored Normal file
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/*
* Copyright (c) 2016, Adam <Adam@sigterm.info>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Adam <Adam@sigterm.info>
* 4. Neither the name of the Adam <Adam@sigterm.info> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Adam <Adam@sigterm.info> ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Adam <Adam@sigterm.info> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package net.runelite.cache.fs.util;
import java.nio.ByteBuffer;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.Arrays;
public class Xtea
{
static
{
Security.addProvider(new BouncyCastleProvider());
}
private final Cipher cipher;
private final int[] keys;
public Xtea(int[] keys) throws NoSuchAlgorithmException, NoSuchPaddingException
{
this.cipher = Cipher.getInstance("XTEA/ECB/NoPadding");
this.keys = keys;
}
private static byte[] packKey(int[] key)
{
ByteBuffer buffer = ByteBuffer.allocate(4 * key.length);
for (int i : key)
buffer.putInt(i);
return buffer.array();
}
public byte[] encrypt(byte[] data, int len) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException
{
cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(packKey(keys), cipher.getAlgorithm()));
byte[] out = cipher.update(data, 0, len - (len % cipher.getBlockSize()));
cipher.doFinal();
// add remaining data, which is not encrypted
if (out.length != len)
{
assert len > out.length;
byte[] padded = Arrays.copyOf(out, len);
System.arraycopy(data, out.length, padded, out.length, len - out.length);
out = padded;
}
return out;
}
public byte[] decrypt(byte[] data, int len) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException
{
cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(packKey(keys), cipher.getAlgorithm()));
byte[] out = cipher.update(data, 0, len - (len % cipher.getBlockSize()));
cipher.doFinal();
if (out.length != len)
{
assert len > out.length;
byte[] padded = Arrays.copyOf(out, len);
System.arraycopy(data, out.length, padded, out.length, len - out.length);
out = padded;
}
return out;
}
}

61
cache/src/test/java/net/runelite/cache/fs/util/XteaTest.java vendored Normal file
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/*
* Copyright (c) 2016, Adam <Adam@sigterm.info>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Adam <Adam@sigterm.info>
* 4. Neither the name of the Adam <Adam@sigterm.info> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Adam <Adam@sigterm.info> ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Adam <Adam@sigterm.info> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package net.runelite.cache.fs.util;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Random;
import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import org.junit.Assert;
import org.junit.Test;
public class XteaTest
{
private final Random random = new Random(42L);
@Test
public void test() throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException
{
byte[] data = new byte[1024];
random.nextBytes(data);
int[] key = new int[] { 4, 8, 15, 16 };
Xtea xtea = new Xtea(key);
byte[] encData = xtea.encrypt(data, data.length);
xtea = new Xtea(key);
byte[] decData = xtea.decrypt(encData, encData.length);
Assert.assertArrayEquals(data, decData);
}
}