public override byte[] Decrypt(byte[] data)
{
lock (this)
{
using (ByteBuffer buffer = new ByteBuffer(data))
{
byte[] header = buffer.ReadBytes(4);
if (!this.Decryptograph.IsValidPacket(header))
{
throw new CryptographyException("Invalid header.");
}
byte[] content = buffer.GetContent();
int length = AesCryptograph.RetrieveLength(header);
if (content.Length == length)
{
this.Decryptograph.Crypt(content);
BlurCryptograph.Decrypt(content);
return(content);
}
else
{
throw new CryptographyException(string.Format("Packet length not matching ({0} != {1}).", content.Length, length));
}
}
}
}
public void UpdateIV()
{
byte[] newIV = new byte[4] {
0xF2, 0x53, 0x50, 0xC6
};
for (int i = 0; i < 4; i++)
{
AesCryptograph.Shuffle(this.IV[i], newIV);
}
this.IV = newIV;
}
public byte[] Initialize()
{
byte[] receiveIV = BitConverter.GetBytes(Application.Random.Next());
byte[] sendIV = BitConverter.GetBytes(Application.Random.Next());
this.Encryptograph = new AesCryptograph(sendIV, unchecked ((short)(0xFFFF - Application.MapleVersion)));
this.Decryptograph = new AesCryptograph(receiveIV, Application.MapleVersion);
using (ByteBuffer buffer = new ByteBuffer(16))
{
buffer.WriteShort(0x0E);
buffer.WriteShort(Application.MapleVersion);
buffer.WriteString(Application.PatchVersion);
buffer.WriteBytes(receiveIV);
buffer.WriteBytes(sendIV);
buffer.WriteByte(8);
return(buffer.Array);
}
}