109 lines
3.9 KiB
Java
109 lines
3.9 KiB
Java
/*
|
|
This file is part of the OdinMS Maple Story Server
|
|
Copyright (C) 2008 Patrick Huy <patrick.huy@frz.cc>
|
|
Matthias Butz <matze@odinms.de>
|
|
Jan Christian Meyer <vimes@odinms.de>
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Affero General Public License as
|
|
published by the Free Software Foundation version 3 as published by
|
|
the Free Software Foundation. You may not use, modify or distribute
|
|
this program under any other version of the GNU Affero General Public
|
|
License.
|
|
|
|
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 Affero General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Affero General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
package net.encryption;
|
|
|
|
public class MapleCustomEncryption {
|
|
private static byte rollLeft(byte in, int count) {
|
|
int tmp = (int) in & 0xFF;
|
|
tmp = tmp << (count % 8);
|
|
return (byte) ((tmp & 0xFF) | (tmp >> 8));
|
|
}
|
|
|
|
private static byte rollRight(byte in, int count) {
|
|
int tmp = (int) in & 0xFF;
|
|
tmp = (tmp << 8) >>> (count % 8);
|
|
|
|
return (byte) ((tmp & 0xFF) | (tmp >>> 8));
|
|
}
|
|
|
|
public static byte[] encryptData(byte[] data) {
|
|
for (int j = 0; j < 6; j++) {
|
|
byte remember = 0;
|
|
byte dataLength = (byte) (data.length & 0xFF);
|
|
if (j % 2 == 0) {
|
|
for (int i = 0; i < data.length; i++) {
|
|
byte cur = data[i];
|
|
cur = rollLeft(cur, 3);
|
|
cur += dataLength;
|
|
cur ^= remember;
|
|
remember = cur;
|
|
cur = rollRight(cur, (int) dataLength & 0xFF);
|
|
cur = ((byte) ((~cur) & 0xFF));
|
|
cur += 0x48;
|
|
dataLength--;
|
|
data[i] = cur;
|
|
}
|
|
} else {
|
|
for (int i = data.length - 1; i >= 0; i--) {
|
|
byte cur = data[i];
|
|
cur = rollLeft(cur, 4);
|
|
cur += dataLength;
|
|
cur ^= remember;
|
|
remember = cur;
|
|
cur ^= 0x13;
|
|
cur = rollRight(cur, 3);
|
|
dataLength--;
|
|
data[i] = cur;
|
|
}
|
|
}
|
|
}
|
|
return data;
|
|
}
|
|
|
|
public static byte[] decryptData(byte[] data) {
|
|
for (int j = 1; j <= 6; j++) {
|
|
byte remember = 0;
|
|
byte dataLength = (byte) (data.length & 0xFF);
|
|
byte nextRemember;
|
|
if (j % 2 == 0) {
|
|
for (int i = 0; i < data.length; i++) {
|
|
byte cur = data[i];
|
|
cur -= 0x48;
|
|
cur = ((byte) ((~cur) & 0xFF));
|
|
cur = rollLeft(cur, (int) dataLength & 0xFF);
|
|
nextRemember = cur;
|
|
cur ^= remember;
|
|
remember = nextRemember;
|
|
cur -= dataLength;
|
|
cur = rollRight(cur, 3);
|
|
data[i] = cur;
|
|
dataLength--;
|
|
}
|
|
} else {
|
|
for (int i = data.length - 1; i >= 0; i--) {
|
|
byte cur = data[i];
|
|
cur = rollLeft(cur, 3);
|
|
cur ^= 0x13;
|
|
nextRemember = cur;
|
|
cur ^= remember;
|
|
remember = nextRemember;
|
|
cur -= dataLength;
|
|
cur = rollRight(cur, 4);
|
|
data[i] = cur;
|
|
dataLength--;
|
|
}
|
|
}
|
|
}
|
|
return data;
|
|
}
|
|
}
|