gistfile1.txt

Assume our encryption key is a array of 9 bytes containing the ASCII values "NexonInc." (Default Dark Ages Encryption Key)

key = {4E 65 78 6F 6E 49 6E 63 2E}

/* This function encrypts or decrypts our packets. Sequence is the packet SEQUENCE number, array is the pointer to the packet DATA, start is WHERE in the array to start and count is HOW MANY bytes to encrypt or decrypt. */
int EncryptDecrypt(byte sequence, byte* array, int start, int count)
{
    for(int i = 0; i < count; i++)
    {
         // XOR by Key, Sequence, and Iteration
         array[start + i] = (byte)(array[start + i] ^ key[i % 9] ^ sequence ^ (i / 9));

         // Xor Cancel Check
         if((i / 9) == sequence)
         {
             array[start + i] = (byte)(array[start + i] ^ sequence);
         }
    }
    return count;
}