/*******************************************************************************
* Copyright (C) 2013 JMaNGOS <http://jmangos.org/>
*
* 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 2 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.jmangos.realm.network.crypt;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import org.jmangos.commons.network.crypt.SARC4;
/**
* The Class Crypt.
*/
public class Crypt {
/** The Server encryption key. */
byte[] serverEncryptionKey = {
(byte) 0xCC, (byte) 0x98, (byte) 0xAE, 0x04, (byte) 0xE8, (byte) 0x97, (byte) 0xEA,
(byte) 0xCA, 0x12, (byte) 0xDD, (byte) 0xC0, (byte) 0x93, 0x42, (byte) 0x91, 0x53, 0x57 };
/** The Server decryption key. */
byte[] clientDecryptionKey = {
(byte) 0xC2, (byte) 0xB3, 0x72, 0x3C, (byte) 0xC6, (byte) 0xAE, (byte) 0xD9, (byte) 0xB5,
0x34, 0x3C, 0x53, (byte) 0xEE, 0x2F, 0x43, 0x67, (byte) 0xCE };
/** The is enabled. */
private boolean isEnabled = false;
/** The _client decrypt. */
private final SARC4 clientDecryptSARC4 = new SARC4();
/** The _server encrypt. */
private final SARC4 serverEncryptSARC4 = new SARC4();
/**
* Instantiates a new crypt.
*/
public Crypt() {
}
/**
* Decrypt.
*
* @param data
* the data
* @return the byte[]
*/
public byte[] decrypt(final byte[] data) {
if (!this.isEnabled) {
return data;
}
return this.clientDecryptSARC4.update(data);
}
/**
* Encrypt.
*
* @param data
* the data
* @return the byte[]
*/
public byte[] encrypt(final byte[] data) {
if (!this.isEnabled) {
return data;
}
return this.serverEncryptSARC4.update(data);
}
/**
* Init crypto-system.
*
* @param key
* is seed
*/
public void init(final byte[] key) {
final byte[] encryptHash = getKey(this.serverEncryptionKey, key);
this.clientDecryptSARC4.init(encryptHash);
final byte[] decryptHash = getKey(this.clientDecryptionKey, key);
this.serverEncryptSARC4.init(decryptHash);
final byte[] tar = new byte[1024];
for (int i = 0; i < tar.length; i++) {
tar[i] = 0;
}
this.serverEncryptSARC4.update(tar);
for (int i = 0; i < tar.length; i++) {
tar[i] = 0;
}
this.clientDecryptSARC4.update(tar);
this.isEnabled = true;
}
/**
* Gets the encryption key.
*
* @param EncryptionKey
* the encryption key
* @param key
* the key
* @return the key
*/
private byte[] getKey(final byte[] EncryptionKey, final byte[] key) {
final SecretKeySpec ds = new SecretKeySpec(EncryptionKey, "HmacSHA1");
Mac m;
try {
m = Mac.getInstance("HmacSHA1");
m.init(ds);
return m.doFinal(key);
} catch (final Exception e) {
e.printStackTrace();
}
return null;
}
}