/*
OrpheusMS: MapleStory Private Server based on OdinMS
Copyright (C) 2012 Aaron Weiss <aaron@deviant-core.net>
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, either version 3 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 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 tools;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;
public class MapleAESOFB {
private byte iv[];
private Cipher cipher;
private short mapleVersion;
private static final byte[] funnyBytes = new byte[] {(byte) 0xEC, (byte) 0x3F, (byte) 0x77, (byte) 0xA4, (byte) 0x45, (byte) 0xD0, (byte) 0x71, (byte) 0xBF, (byte) 0xB7, (byte) 0x98, (byte) 0x20, (byte) 0xFC, (byte) 0x4B, (byte) 0xE9, (byte) 0xB3, (byte) 0xE1, (byte) 0x5C, (byte) 0x22, (byte) 0xF7, (byte) 0x0C, (byte) 0x44, (byte) 0x1B, (byte) 0x81, (byte) 0xBD, (byte) 0x63, (byte) 0x8D, (byte) 0xD4, (byte) 0xC3, (byte) 0xF2, (byte) 0x10, (byte) 0x19, (byte) 0xE0, (byte) 0xFB, (byte) 0xA1, (byte) 0x6E, (byte) 0x66, (byte) 0xEA, (byte) 0xAE, (byte) 0xD6, (byte) 0xCE, (byte) 0x06, (byte) 0x18, (byte) 0x4E, (byte) 0xEB, (byte) 0x78, (byte) 0x95, (byte) 0xDB, (byte) 0xBA, (byte) 0xB6, (byte) 0x42, (byte) 0x7A, (byte) 0x2A, (byte) 0x83, (byte) 0x0B, (byte) 0x54, (byte) 0x67, (byte) 0x6D, (byte) 0xE8, (byte) 0x65, (byte) 0xE7, (byte) 0x2F, (byte) 0x07, (byte) 0xF3, (byte) 0xAA, (byte) 0x27, (byte) 0x7B, (byte) 0x85, (byte) 0xB0, (byte) 0x26, (byte) 0xFD, (byte) 0x8B, (byte) 0xA9, (byte) 0xFA, (byte) 0xBE, (byte) 0xA8, (byte) 0xD7, (byte) 0xCB, (byte) 0xCC, (byte) 0x92, (byte) 0xDA, (byte) 0xF9, (byte) 0x93, (byte) 0x60, (byte) 0x2D, (byte) 0xDD, (byte) 0xD2, (byte) 0xA2, (byte) 0x9B, (byte) 0x39, (byte) 0x5F, (byte) 0x82, (byte) 0x21, (byte) 0x4C, (byte) 0x69, (byte) 0xF8, (byte) 0x31, (byte) 0x87, (byte) 0xEE, (byte) 0x8E, (byte) 0xAD, (byte) 0x8C, (byte) 0x6A, (byte) 0xBC, (byte) 0xB5, (byte) 0x6B, (byte) 0x59, (byte) 0x13, (byte) 0xF1, (byte) 0x04, (byte) 0x00, (byte) 0xF6, (byte) 0x5A, (byte) 0x35, (byte) 0x79, (byte) 0x48, (byte) 0x8F, (byte) 0x15, (byte) 0xCD, (byte) 0x97, (byte) 0x57, (byte) 0x12, (byte) 0x3E, (byte) 0x37, (byte) 0xFF, (byte) 0x9D, (byte) 0x4F, (byte) 0x51, (byte) 0xF5, (byte) 0xA3, (byte) 0x70, (byte) 0xBB, (byte) 0x14, (byte) 0x75, (byte) 0xC2, (byte) 0xB8, (byte) 0x72, (byte) 0xC0, (byte) 0xED, (byte) 0x7D, (byte) 0x68, (byte) 0xC9, (byte) 0x2E, (byte) 0x0D, (byte) 0x62, (byte) 0x46, (byte) 0x17, (byte) 0x11, (byte) 0x4D, (byte) 0x6C, (byte) 0xC4, (byte) 0x7E, (byte) 0x53, (byte) 0xC1, (byte) 0x25, (byte) 0xC7, (byte) 0x9A, (byte) 0x1C, (byte) 0x88, (byte) 0x58, (byte) 0x2C, (byte) 0x89, (byte) 0xDC, (byte) 0x02, (byte) 0x64, (byte) 0x40, (byte) 0x01, (byte) 0x5D, (byte) 0x38, (byte) 0xA5, (byte) 0xE2, (byte) 0xAF, (byte) 0x55, (byte) 0xD5, (byte) 0xEF, (byte) 0x1A, (byte) 0x7C, (byte) 0xA7, (byte) 0x5B, (byte) 0xA6, (byte) 0x6F, (byte) 0x86, (byte) 0x9F, (byte) 0x73, (byte) 0xE6, (byte) 0x0A, (byte) 0xDE, (byte) 0x2B, (byte) 0x99, (byte) 0x4A, (byte) 0x47, (byte) 0x9C, (byte) 0xDF, (byte) 0x09, (byte) 0x76, (byte) 0x9E, (byte) 0x30, (byte) 0x0E, (byte) 0xE4, (byte) 0xB2, (byte) 0x94, (byte) 0xA0, (byte) 0x3B, (byte) 0x34, (byte) 0x1D, (byte) 0x28, (byte) 0x0F, (byte) 0x36, (byte) 0xE3, (byte) 0x23, (byte) 0xB4, (byte) 0x03, (byte) 0xD8, (byte) 0x90, (byte) 0xC8, (byte) 0x3C, (byte) 0xFE, (byte) 0x5E, (byte) 0x32, (byte) 0x24, (byte) 0x50, (byte) 0x1F, (byte) 0x3A, (byte) 0x43, (byte) 0x8A, (byte) 0x96, (byte) 0x41, (byte) 0x74, (byte) 0xAC, (byte) 0x52, (byte) 0x33, (byte) 0xF0, (byte) 0xD9, (byte) 0x29, (byte) 0x80, (byte) 0xB1, (byte) 0x16, (byte) 0xD3, (byte) 0xAB, (byte) 0x91, (byte) 0xB9, (byte) 0x84, (byte) 0x7F, (byte) 0x61, (byte) 0x1E, (byte) 0xCF, (byte) 0xC5, (byte) 0xD1, (byte) 0x56, (byte) 0x3D, (byte) 0xCA, (byte) 0xF4, (byte) 0x05, (byte) 0xC6, (byte) 0xE5, (byte) 0x08, (byte) 0x49};
public MapleAESOFB(byte key[], byte iv[], short mapleVersion) {
SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
try {
cipher = Cipher.getInstance("AES");
} catch (NoSuchAlgorithmException e) {
Output.print("ERROR " + e);
} catch (NoSuchPaddingException e) {
Output.print("ERROR " + e);
}
try {
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
} catch (InvalidKeyException e) {
}
this.setIv(iv);
this.mapleVersion = (short) (((mapleVersion >> 8) & 0xFF) | ((mapleVersion << 8) & 0xFF00));
}
private void setIv(byte[] iv) {
this.iv = iv;
}
private static byte[] multiplyBytes(byte[] in, int count, int mul) {
byte[] ret = new byte[count * mul];
for (int x = 0; x < count * mul; x++) {
ret[x] = in[x % count];
}
return ret;
}
public synchronized byte[] crypt(byte[] data) {
int remaining = data.length;
int llength = 0x5B0;
int start = 0;
while (remaining > 0) {
byte[] myIv = multiplyBytes(this.iv, 4, 4);
if (remaining < llength) {
llength = remaining;
}
for (int x = start; x < (start + llength); x++) {
if ((x - start) % myIv.length == 0) {
try {
byte[] newIv = cipher.doFinal(myIv);
for (int j = 0; j < myIv.length; j++) {
myIv[j] = newIv[j];
}
} catch (IllegalBlockSizeException e) {
} catch (BadPaddingException e) {
}
}
data[x] ^= myIv[(x - start) % myIv.length];
}
start += llength;
remaining -= llength;
llength = 0x5B4;
}
updateIv();
return data;
}
private synchronized void updateIv() {
this.iv = getNewIv(this.iv);
}
public byte[] getPacketHeader(int length) {
int iiv = (iv[3]) & 0xFF;
iiv |= (iv[2] << 8) & 0xFF00;
iiv ^= mapleVersion;
int mlength = ((length << 8) & 0xFF00) | (length >>> 8);
int xoredIv = iiv ^ mlength;
byte[] ret = new byte[4];
ret[0] = (byte) ((iiv >>> 8) & 0xFF);
ret[1] = (byte) (iiv & 0xFF);
ret[2] = (byte) ((xoredIv >>> 8) & 0xFF);
ret[3] = (byte) (xoredIv & 0xFF);
return ret;
}
public static int getPacketLength(int packetHeader) {
int packetLength = ((packetHeader >>> 16) ^ (packetHeader & 0xFFFF));
packetLength = ((packetLength << 8) & 0xFF00) | ((packetLength >>> 8) & 0xFF);
return packetLength;
}
public boolean checkPacket(byte[] packet) {
return ((((packet[0] ^ iv[2]) & 0xFF) == ((mapleVersion >> 8) & 0xFF)) && (((packet[1] ^ iv[3]) & 0xFF) == (mapleVersion & 0xFF)));
}
public boolean checkPacket(int packetHeader) {
byte packetHeaderBuf[] = new byte[2];
packetHeaderBuf[0] = (byte) ((packetHeader >> 24) & 0xFF);
packetHeaderBuf[1] = (byte) ((packetHeader >> 16) & 0xFF);
return checkPacket(packetHeaderBuf);
}
public static byte[] getNewIv(byte oldIv[]) {
byte[] in = {(byte) 0xf2, 0x53, (byte) 0x50, (byte) 0xc6};
for (int x = 0; x < 4; x++) {
funnyShit(oldIv[x], in);
}
return in;
}
@Override
public String toString() {
return "IV: " + HexTool.toString(this.iv);
}
private static byte[] funnyShit(byte inputByte, byte[] in) {
byte elina = in[1];
byte anna = inputByte;
byte moritz = funnyBytes[(int) elina & 0xFF];
moritz -= inputByte;
in[0] += moritz;
moritz = in[2];
moritz ^= funnyBytes[(int) anna & 0xFF];
elina -= (int) moritz & 0xFF;
in[1] = elina;
elina = in[3];
moritz = elina;
elina -= (int) in[0] & 0xFF;
moritz = funnyBytes[(int) moritz & 0xFF];
moritz += inputByte;
moritz ^= in[2];
in[2] = moritz;
elina += (int) funnyBytes[(int) anna & 0xFF] & 0xFF;
in[3] = elina;
int merry = ((int) in[0]) & 0xFF;
merry |= (in[1] << 8) & 0xFF00;
merry |= (in[2] << 16) & 0xFF0000;
merry |= (in[3] << 24) & 0xFF000000;
int ret_value = merry;
ret_value = ret_value >>> 0x1d;
merry = merry << 3;
ret_value = ret_value | merry;
in[0] = (byte) (ret_value & 0xFF);
in[1] = (byte) ((ret_value >> 8) & 0xFF);
in[2] = (byte) ((ret_value >> 16) & 0xFF);
in[3] = (byte) ((ret_value >> 24) & 0xFF);
return in;
}
}