/// <summary>
/// Decrypt a packet's data
/// </summary>
public static int DecryptPacketData(NetcodePacketHeader header, ulong protocolID, byte[] packetData, int packetDataLen, byte[] key, byte[] outBuffer)
{
byte[] additionalData = BufferPool.GetBuffer(Defines.NETCODE_VERSION_INFO_BYTES + 8 + 1);
using (var writer = ByteArrayReaderWriter.Get(additionalData))
{
writer.WriteASCII(Defines.NETCODE_VERSION_INFO_STR);
writer.Write(protocolID);
writer.Write(header.ReadSequenceByte);
}
byte[] nonce = BufferPool.GetBuffer(12);
using (var writer = ByteArrayReaderWriter.Get(nonce))
{
writer.Write((UInt32)0);
writer.Write(header.SequenceNumber);
}
int ret;
try
{
ret = CryptoUtils.Decrypt(packetData, 0, packetDataLen, additionalData, key, nonce, outBuffer);
}
catch (Exception e)
{
BufferPool.ReturnBuffer(additionalData);
BufferPool.ReturnBuffer(nonce);
throw e;
}
BufferPool.ReturnBuffer(additionalData);
BufferPool.ReturnBuffer(nonce);
return(ret);
}
/// <summary>
/// Read and decrypt packet data into an output buffer
/// </summary>
public static int ReadPacketData(NetcodePacketHeader header, ByteArrayReaderWriter stream, int length, ulong protocolID, byte[] key, byte[] outputBuffer)
{
byte[] encryptedBuffer = BufferPool.GetBuffer(2048);
stream.ReadBytesIntoBuffer(encryptedBuffer, length);
int decryptedBytes;
try
{
decryptedBytes = DecryptPacketData(header, protocolID, encryptedBuffer, length, key, outputBuffer);
}
catch (Exception e)
{
BufferPool.ReturnBuffer(encryptedBuffer);
throw e;
}
return(decryptedBytes);
}
