actual freya branch
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/*
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* This program is free software: you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.l2jserver.util.crypt;
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import java.io.IOException;
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import java.util.logging.Logger;
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/**
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* This class ...
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* @version $Revision: 1.3.4.1 $ $Date: 2005/03/27 15:30:09 $
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*/
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public class NewCrypt
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{
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protected static Logger _log = Logger.getLogger(NewCrypt.class.getName());
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BlowfishEngine _crypt;
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BlowfishEngine _decrypt;
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/**
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* @param blowfishKey
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*/
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public NewCrypt(byte[] blowfishKey)
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{
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_crypt = new BlowfishEngine();
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_crypt.init(true, blowfishKey);
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_decrypt = new BlowfishEngine();
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_decrypt.init(false, blowfishKey);
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}
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public NewCrypt(String key)
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{
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this(key.getBytes());
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}
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public static boolean verifyChecksum(byte[] raw)
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{
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return NewCrypt.verifyChecksum(raw, 0, raw.length);
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}
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public static boolean verifyChecksum(byte[] raw, final int offset, final int size)
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{
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// check if size is multiple of 4 and if there is more then only the checksum
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if (((size & 3) != 0) || (size <= 4))
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{
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return false;
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}
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long chksum = 0;
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int count = size - 4;
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long check = -1;
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int i;
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for (i = offset; i < count; i += 4)
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{
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check = raw[i] & 0xff;
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check |= (raw[i + 1] << 8) & 0xff00;
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check |= (raw[i + 2] << 0x10) & 0xff0000;
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check |= (raw[i + 3] << 0x18) & 0xff000000;
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chksum ^= check;
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}
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check = raw[i] & 0xff;
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check |= (raw[i + 1] << 8) & 0xff00;
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check |= (raw[i + 2] << 0x10) & 0xff0000;
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check |= (raw[i + 3] << 0x18) & 0xff000000;
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return check == chksum;
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}
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public static void appendChecksum(byte[] raw)
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{
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NewCrypt.appendChecksum(raw, 0, raw.length);
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}
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public static void appendChecksum(byte[] raw, final int offset, final int size)
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{
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long chksum = 0;
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int count = size - 4;
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long ecx;
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int i;
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for (i = offset; i < count; i += 4)
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{
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ecx = raw[i] & 0xff;
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ecx |= (raw[i + 1] << 8) & 0xff00;
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ecx |= (raw[i + 2] << 0x10) & 0xff0000;
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ecx |= (raw[i + 3] << 0x18) & 0xff000000;
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chksum ^= ecx;
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}
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ecx = raw[i] & 0xff;
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ecx |= (raw[i + 1] << 8) & 0xff00;
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ecx |= (raw[i + 2] << 0x10) & 0xff0000;
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ecx |= (raw[i + 3] << 0x18) & 0xff000000;
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raw[i] = (byte) (chksum & 0xff);
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raw[i + 1] = (byte) ((chksum >> 0x08) & 0xff);
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raw[i + 2] = (byte) ((chksum >> 0x10) & 0xff);
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raw[i + 3] = (byte) ((chksum >> 0x18) & 0xff);
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}
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/**
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* Packet is first XOR encoded with <code>key</code> Then, the last 4 bytes are overwritten with the the XOR "key". Thus this assume that there is enough room for the key to fit without overwriting data.
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* @param raw The raw bytes to be encrypted
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* @param key The 4 bytes (int) XOR key
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*/
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public static void encXORPass(byte[] raw, int key)
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{
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NewCrypt.encXORPass(raw, 0, raw.length, key);
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}
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/**
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* Packet is first XOR encoded with <code>key</code> Then, the last 4 bytes are overwritten with the the XOR "key". Thus this assume that there is enough room for the key to fit without overwriting data.
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* @param raw The raw bytes to be encrypted
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* @param offset The begining of the data to be encrypted
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* @param size Length of the data to be encrypted
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* @param key The 4 bytes (int) XOR key
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*/
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public static void encXORPass(byte[] raw, final int offset, final int size, int key)
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{
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int stop = size - 8;
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int pos = 4 + offset;
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int edx;
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int ecx = key; // Initial xor key
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while (pos < stop)
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{
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edx = (raw[pos] & 0xFF);
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edx |= (raw[pos + 1] & 0xFF) << 8;
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edx |= (raw[pos + 2] & 0xFF) << 16;
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edx |= (raw[pos + 3] & 0xFF) << 24;
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ecx += edx;
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edx ^= ecx;
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raw[pos++] = (byte) (edx & 0xFF);
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raw[pos++] = (byte) ((edx >> 8) & 0xFF);
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raw[pos++] = (byte) ((edx >> 16) & 0xFF);
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raw[pos++] = (byte) ((edx >> 24) & 0xFF);
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}
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raw[pos++] = (byte) (ecx & 0xFF);
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raw[pos++] = (byte) ((ecx >> 8) & 0xFF);
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raw[pos++] = (byte) ((ecx >> 16) & 0xFF);
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raw[pos++] = (byte) ((ecx >> 24) & 0xFF);
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}
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public byte[] decrypt(byte[] raw) throws IOException
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{
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byte[] result = new byte[raw.length];
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int count = raw.length / 8;
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for (int i = 0; i < count; i++)
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{
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_decrypt.processBlock(raw, i * 8, result, i * 8);
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}
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return result;
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}
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public void decrypt(byte[] raw, final int offset, final int size) throws IOException
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{
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byte[] result = new byte[size];
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int count = size / 8;
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for (int i = 0; i < count; i++)
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{
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_decrypt.processBlock(raw, offset + (i * 8), result, i * 8);
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}
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// TODO can the crypt and decrypt go direct to the array
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System.arraycopy(result, 0, raw, offset, size);
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}
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public byte[] crypt(byte[] raw) throws IOException
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{
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int count = raw.length / 8;
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byte[] result = new byte[raw.length];
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for (int i = 0; i < count; i++)
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{
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_crypt.processBlock(raw, i * 8, result, i * 8);
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}
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return result;
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}
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public void crypt(byte[] raw, final int offset, final int size) throws IOException
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{
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int count = size / 8;
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byte[] result = new byte[size];
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for (int i = 0; i < count; i++)
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{
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_crypt.processBlock(raw, offset + (i * 8), result, i * 8);
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}
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// TODO can the crypt and decrypt go direct to the array
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System.arraycopy(result, 0, raw, offset, size);
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}
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}
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