public static RecordType ReadRecord(ref ReadableBuffer messageBuffer, State.IConnectionState state)
{
if (messageBuffer.Length < RecordHeaderLength)
{
Alerts.AlertException.ThrowAlert(Alerts.AlertLevel.Fatal, Alerts.AlertDescription.decode_error, "The message buffer length is smaller than the record header length");
}
var recordType = messageBuffer.ReadBigEndian <RecordType>();
var version = messageBuffer.Slice(sizeof(RecordType)).ReadBigEndian <ushort>();
var size = messageBuffer.Slice(sizeof(RecordType) + sizeof(ushort)).ReadBigEndian <ushort>();
if (state?.ReadKey == null)
{
messageBuffer = messageBuffer.Slice(RecordHeaderLength);
return(recordType);
}
if ((TlsVersion)state.TlsRecordVersion == TlsVersion.Tls12)
{
state.ReadKey.DecryptWithAuthData(ref messageBuffer);
return(recordType);
}
else
{
messageBuffer = messageBuffer.Slice(RecordHeaderLength);
state.ReadKey.Decrypt(ref messageBuffer);
RemovePadding(ref messageBuffer);
recordType = messageBuffer.Slice(messageBuffer.Length - sizeof(RecordType)).ReadBigEndian <RecordType>();
messageBuffer = messageBuffer.Slice(0, messageBuffer.Length - sizeof(RecordType));
return(recordType);
}
}
public static void WriteRecord(ref WritableBuffer buffer, RecordType recordType, ReadableBuffer plainText, State.IConnectionState state)
{
buffer.Ensure(RecordHeaderLength);
if (state.WriteKey == null)
{
buffer.WriteBigEndian(recordType);
buffer.WriteBigEndian(TlsRecordVersion);
buffer.WriteBigEndian((ushort)plainText.Length);
buffer.Append(plainText);
return;
}
buffer.WriteBigEndian(RecordType.Application);
buffer.WriteBigEndian(TlsRecordVersion);
var totalSize = plainText.Length + state.WriteKey.Overhead + sizeof(RecordType);
buffer.WriteBigEndian((ushort)totalSize);
state.WriteKey.Encrypt(ref buffer, plainText, recordType);
}
public static void WriteAlert(ref WritableBuffer output, AlertLevel level, AlertDescription description, State.IConnectionState connectionState)
{
connectionState.FrameWriter.StartFrame(RecordType.Alert, ref output);
output.WriteBigEndian(level);
output.WriteBigEndian(description);
connectionState.FrameWriter.FinishFrame(ref output);
}
public static void WriteAlert(ref WritableBuffer output, AlertLevel level, AlertDescription description, State.IConnectionState connectionState)
{
var buffer = new byte[sizeof(AlertLevel) + sizeof(AlertDescription)];
var span = new Span <byte>(buffer);
span.Write(level);
span = span.Slice(sizeof(AlertLevel));
span.Write(description);
RecordProcessor.WriteRecord(ref output, RecordType.Alert, buffer, connectionState);
}