/// <summary>
/// Applies Nexon's implementation of AES on the buffer
/// </summary>
/// <param name="buffer">The data to encrypt</param>
/// <param name="amount">The amount of bytes to encrypt in the buffer</param>
/// <param name="offset">The starting point in the buffer</param>
private void Transform(ref byte[] buffer, int amount, int offset)
{
int remaining = amount - offset,
length = 0x5B0,
start = 0,
index;
byte[] realIV = new byte[sizeof(int) * 4],
IVBytes = IV.Bytes;
while (remaining > 0)
{
for (index = 0; index < realIV.Length; ++index)
{
realIV[index] = IVBytes[index % 4];
}
if (remaining < length)
{
length = remaining;
}
for (index = start; index < (start + length); ++index)
{
if (((index - start) % realIV.Length) == 0)
{
AES.TransformBlock(ref realIV);
}
buffer[index + offset] ^= realIV[(index - start) % realIV.Length];
}
start += length;
remaining -= length;
length = 0x5B4;
}
IV.Shuffle();
}
