/// <summary>
/// Encrypt am outgoing message with this algorithm;
/// no writing can be done to the message after encryption,
/// or message will be corrupted.
/// </summary>
public override bool Encrypt(NetOutgoingMessage message)
{
if (message == null)
{
throw new ArgumentNullException(nameof(message));
}
int payloadBitLength = message.BitLength;
int numBytes = message.ByteLength;
int blockSize = BlockSize;
int numBlocks = (int)Math.Ceiling(numBytes / (double)blockSize);
int dstSize = numBlocks * blockSize;
message.EnsureBitCapacity((dstSize + 4) * 8); // add 4 bytes for payload length
message.BitPosition = 0;
Span <byte> buffer = _buffer.AsSpan();
Span <byte> messageBuffer = message.GetBuffer().AsSpan();
for (int i = 0; i < numBlocks; i++)
{
Span <byte> messageSlice = messageBuffer[(i * blockSize)..];