com.ursful.framework.mina.common.tools.AesOfb Maven / Gradle / Ivy
package com.ursful.framework.mina.common.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;
/**
* Provides a class for encrypting MapleStory packets with AES OFB encryption.
*
* @author Frz
* @version 1.0
* @since Revision 320
*/
public class AesOfb {
private byte iv[];
private Cipher cipher;
public Cipher getCipher(){
return cipher;
}
//private short version;
private static final byte[] funnyBytes = new byte[]{(byte) 0xEC, 0x3F, 0x77, (byte) 0xA4, 0x45, (byte) 0xD0,
0x71, (byte) 0xBF, (byte) 0xB7, (byte) 0x98, 0x20, (byte) 0xFC, 0x4B, (byte) 0xE9, (byte) 0xB3, (byte) 0xE1,
0x5C, 0x22, (byte) 0xF7, 0x0C, 0x44, 0x1B, (byte) 0x81, (byte) 0xBD, 0x63, (byte) 0x8D, (byte) 0xD4,
(byte) 0xC3, (byte) 0xF2, 0x10, 0x19, (byte) 0xE0, (byte) 0xFB, (byte) 0xA1, 0x6E, 0x66, (byte) 0xEA,
(byte) 0xAE, (byte) 0xD6, (byte) 0xCE, 0x06, 0x18, 0x4E, (byte) 0xEB, 0x78, (byte) 0x95, (byte) 0xDB,
(byte) 0xBA, (byte) 0xB6, 0x42, 0x7A, 0x2A, (byte) 0x83, 0x0B, 0x54, 0x67, 0x6D, (byte) 0xE8, 0x65,
(byte) 0xE7, 0x2F, 0x07, (byte) 0xF3, (byte) 0xAA, 0x27, 0x7B, (byte) 0x85, (byte) 0xB0, 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, 0x60, 0x2D, (byte) 0xDD, (byte) 0xD2, (byte) 0xA2,
(byte) 0x9B, 0x39, 0x5F, (byte) 0x82, 0x21, 0x4C, 0x69, (byte) 0xF8, 0x31, (byte) 0x87, (byte) 0xEE,
(byte) 0x8E, (byte) 0xAD, (byte) 0x8C, 0x6A, (byte) 0xBC, (byte) 0xB5, 0x6B, 0x59, 0x13, (byte) 0xF1, 0x04,
0x00, (byte) 0xF6, 0x5A, 0x35, 0x79, 0x48, (byte) 0x8F, 0x15, (byte) 0xCD, (byte) 0x97, 0x57, 0x12, 0x3E, 0x37,
(byte) 0xFF, (byte) 0x9D, 0x4F, 0x51, (byte) 0xF5, (byte) 0xA3, 0x70, (byte) 0xBB, 0x14, 0x75, (byte) 0xC2,
(byte) 0xB8, 0x72, (byte) 0xC0, (byte) 0xED, 0x7D, 0x68, (byte) 0xC9, 0x2E, 0x0D, 0x62, 0x46, 0x17, 0x11, 0x4D,
0x6C, (byte) 0xC4, 0x7E, 0x53, (byte) 0xC1, 0x25, (byte) 0xC7, (byte) 0x9A, 0x1C, (byte) 0x88, 0x58, 0x2C,
(byte) 0x89, (byte) 0xDC, 0x02, 0x64, 0x40, 0x01, 0x5D, 0x38, (byte) 0xA5, (byte) 0xE2, (byte) 0xAF, 0x55,
(byte) 0xD5, (byte) 0xEF, 0x1A, 0x7C, (byte) 0xA7, 0x5B, (byte) 0xA6, 0x6F, (byte) 0x86, (byte) 0x9F, 0x73,
(byte) 0xE6, 0x0A, (byte) 0xDE, 0x2B, (byte) 0x99, 0x4A, 0x47, (byte) 0x9C, (byte) 0xDF, 0x09, 0x76,
(byte) 0x9E, 0x30, 0x0E, (byte) 0xE4, (byte) 0xB2, (byte) 0x94, (byte) 0xA0, 0x3B, 0x34, 0x1D, 0x28, 0x0F,
0x36, (byte) 0xE3, 0x23, (byte) 0xB4, 0x03, (byte) 0xD8, (byte) 0x90, (byte) 0xC8, 0x3C, (byte) 0xFE, 0x5E,
0x32, 0x24, 0x50, 0x1F, 0x3A, 0x43, (byte) 0x8A, (byte) 0x96, 0x41, 0x74, (byte) 0xAC, 0x52, 0x33, (byte) 0xF0,
(byte) 0xD9, 0x29, (byte) 0x80, (byte) 0xB1, 0x16, (byte) 0xD3, (byte) 0xAB, (byte) 0x91, (byte) 0xB9,
(byte) 0x84, 0x7F, 0x61, 0x1E, (byte) 0xCF, (byte) 0xC5, (byte) 0xD1, 0x56, 0x3D, (byte) 0xCA, (byte) 0xF4,
0x05, (byte) 0xC6, (byte) 0xE5, 0x08, 0x49
};
public static final byte[] AES_KEY = {
0x00, 0x00, 0x00, 0x00,
0x06, 0x00, 0x00, 0x00,
/*0x00, 0x00, 0x00, 0x00,
0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x01, 0x00, 0x00, 0x00,*/
0x02, 0x00, 0x00, 0x00,
0x09, 0x00, 0x00, 0x00
};
public static void main(String[] args) throws Exception{
byte [] in = new byte[]{1,2,3,4};
in = "1234".getBytes();
AesOfb ao = new AesOfb(AES_KEY, in);
byte[] ret = new byte[4 * 4];
for (int x = 0; x < 4 * 4; x++) {
ret[x] = in[x % 4];
}
ret = "1234".getBytes();
for(byte b : AES_KEY){
System.out.print((Integer.toHexString(b&0x000000FF))+ " ");
}
System.out.println();
for(byte b : ret){
System.out.print((Integer.toHexString(b&0x000000FF))+ " ");
}
System.out.println();
byte[] newIv = ao.getCipher().doFinal(in);
System.out.println(newIv.length);
for(byte b : newIv){
System.out.print((Integer.toHexString(b&0x000000FF))+ " ");
}
//59 b0 27 85 f3 31 40 a7 ed b e5 a0 aa 26 1b ff 54 d9 d8 18 6a 99 a1 19 0 15 f5 10 8 35 da 7f
}
/**
* Class constructor - Creates an instance of the MapleStory encryption
* cipher.
* @param key The 256 bit AES key to use.
* @param iv The 4-byte IV to use.
*/
public AesOfb(byte key[], byte iv[]) {
// for(byte b : key){
// System.out.print((Integer.toHexString(b&0x000000FF))+ " ");
// }
SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
try {
cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
this.setIv(iv);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
/*byte [] newKey = new byte[key.length/2];
System.arraycopy(key, 0, newKey, 0, newKey.length);
skeySpec = new SecretKeySpec(newKey, "AES");
try{
cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
this.setIv(iv);
this.keyLength = newKey.length;
}catch (NoSuchAlgorithmException e1) {
e.printStackTrace();
} catch (NoSuchPaddingException e1) {
e.printStackTrace();
} catch (InvalidKeyException e1) {
e.printStackTrace();
}*/
}
//this.mapleVersion = (short) (((mapleVersion >> 8) & 0xFF) | ((mapleVersion << 8) & 0xFF00));
}
/**
* Sets the IV of this instance.
*
* @param iv The new IV.
*/
private void setIv(byte[] iv) {
this.iv = iv;
}
/**
* For debugging/testing purposes only.
*
* @return The IV.
*/
public byte[] getIv() {
return this.iv;
}
/**
* Encrypts data and generates a new IV.
*
* @param data The bytes to encrypt.
* @return The encrypted bytes.
*/
public synchronized byte[] crypt(byte[] data) {
synchronized (this) {
int remaining = data.length;
int llength = 0x5B0;//1456
int start = 0;
while (remaining > 0) {
byte[] myIv = BitTools.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) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
}
}
data[x] ^= myIv[(x - start) % myIv.length];
}
start += llength;
remaining -= llength;
llength = 0x5B4;//1460
}
updateIv();
}
return data;
}
/**
* Generates a new IV.
*/
private void updateIv() {
this.iv = getNewIv(this.iv);
}
/**
* Generates a packet header for a packet that is length long.
*
* @param length How long the packet that this header is for is.
* @return The header.
*/
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;
}
/**
* Gets the packet length from a header.
*
* @param packetHeader The header as an integer.
* @return The length of the packet.
*/
public static int getPacketLength(int packetHeader) {
int packetLength = ((packetHeader >>> 16) ^ (packetHeader & 0xFFFF));
packetLength = ((packetLength << 8) & 0xFF00) | ((packetLength >>> 8) & 0xFF); // fix endianness
return packetLength;
}
/**
* Gets the packet length from a header.
*
* @param packetHeader The header as a byte array.
* @return The length of the packet.
*/
public static int getPacketLength(byte[] packetHeader) {
if (packetHeader.length < 4) {
return -1;
}
return ((packetHeader[0] ^ packetHeader[2]) & 0xFF) | (((packetHeader[1] ^ packetHeader[3]) << 8) & 0xFF00);
}
/*
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);
}*/
/**
* Gets a new IV from oldIv
*
* @param oldIv The old IV to get a new IV from.
* @return The new IV.
*/
public static byte[] getNewIv(byte oldIv[]) {
byte[] in = {(byte) 0xf2, 0x53, (byte) 0x50, (byte) 0xc6}; // magic
for (int x = 0; x < 4; x++) {
funnyShit(oldIv[x], in);
}
return in;
}
/**
* Returns the IV of this instance as a string.
*/
@Override
public String toString() {
return "IV:" + Integer.toHexString(hashCode());
}
/**
* Does funny stuff. this.OldIV must not equal
* in Modifies in and returns it for
* convenience.
*
* @param inputByte The byte to apply the funny stuff to.
* @param in Something needed for all this to occur.
* @return The modified version of in .
*/
public 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;
//System.out.println("merry : " + merry);
int ret_value = merry;
ret_value = ret_value >>> 0x1d;
merry = merry << 3;
ret_value = ret_value | merry;
//System.out.println("ret_value : " + ret_value);
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;
}
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