public override unsafe bool Decrypt(NetIncomingMessage message)
{
if (message == null)
{
throw new ArgumentNullException(nameof(message));
}
int unEncLenBits = (int)message.ReadUInt32();
int byteLen = NetBitWriter.BytesForBits(unEncLenBits);
var result = message.StoragePool.Rent(byteLen);
// TODO: create stream that takes Memory<byte> overload
fixed(byte *msgPtr = message.GetBuffer())
{
using var ms = new UnmanagedMemoryStream(msgPtr + 4, message.ByteLength - 4);
using var decryptor = Algorithm.CreateDecryptor();
using var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read);
cs.Read(result, 0, byteLen);
}
message.SetBuffer(result, true);
message.BitLength = unEncLenBits;
message.BitPosition = 0;
return(true);
}
internal void Encode(Span <byte> destination, ref int offset, int sequenceNumber)
{
// 8 bits - NetMessageType
// 1 bit - Fragment?
// 15 bits - Sequence number
// 16 bits - Payload length in bits
destination[offset++] = (byte)_messageType;
destination[offset++] = (byte)((_fragmentGroup == 0 ? 0 : 1) | (sequenceNumber << 1));
destination[offset++] = (byte)(sequenceNumber >> 7);
if (_fragmentGroup == 0)
{
destination[offset++] = (byte)BitLength;
destination[offset++] = (byte)(BitLength >> 8);
int byteLen = NetBitWriter.BytesForBits(BitLength);
GetBuffer().AsSpan(0, byteLen).CopyTo(destination[offset..]);
private void WriteLocalHail(NetOutgoingMessage om)
{
if (LocalHailMessage == null)
{
return;
}
int bitsToAppend = LocalHailMessage.BitLength - LocalHailMessage.BitPosition;
if (bitsToAppend > 0)
{
if (om.ByteLength + NetBitWriter.BytesForBits(bitsToAppend) > _peerConfiguration._maximumTransmissionUnit - 10)
{
Peer.ThrowOrLog(
"Hail message too large; can maximally be " +
(_peerConfiguration._maximumTransmissionUnit - 10 - om.ByteLength));
}
om.Write(LocalHailMessage);
}
}
private void WriteLocalHail(NetOutgoingMessage om)
{
if (LocalHailMessage == null)
{
return;
}
int bitsToAppend = LocalHailMessage.BitLength - LocalHailMessage.BitPosition;
if (bitsToAppend > 0)
{
int resultSize = om.ByteLength + NetBitWriter.BytesForBits(bitsToAppend);
int maxMtuSize = _peerConfiguration._maximumTransmissionUnit - 10;
if (resultSize > maxMtuSize)
{
int maxHailSize = maxMtuSize - om.ByteLength;
Peer.LogError(NetLogMessage.FromValues(NetLogCode.HailMessageTooLarge, value: resultSize, maxValue: maxHailSize));
}
om.Write(LocalHailMessage);
}
}
