public static bool TryParseEncrypted(MemoryCursor cursor, IAead aead, ulong sequenceNumber, out Record result)
{
var startOffsetOfMessage = cursor.AsOffset();
result = new Record();
if (!RecordType.TrySlice(cursor, RecordType.ApplicationData))
{
return(false);
}
var legacyVersion = ProtocolVersion.Parse(cursor);
if (legacyVersion != ProtocolVersion.Tls12)
{
throw new EncodingException();
}
var body = RecordLength.DecryptBytes(cursor, startOffsetOfMessage, aead, sequenceNumber);
using var bodyContext = body.SetCursor(cursor);
var startOffsetOfBody = cursor.AsOffset();
cursor.MoveEnd();
var actualType = RecordType.ParseReverse(cursor);
result = new Record(actualType, legacyVersion, new MemoryBuffer(startOffsetOfBody, cursor - startOffsetOfBody));
return(true);
}
public static RecordLength.WritingContext StartWriting(MemoryCursor cursor, RecordType type, ProtocolVersion protocolVersion)
{
type.WriteBytes(cursor);
protocolVersion.WriteBytes(cursor);
return(RecordLength.StartWriting(cursor));
}
public static RecordLength.EncryptedWritingContext StartEncryptedWriting(MemoryCursor cursor, RecordType type, IAead aead, ulong sequenceNumber)
{
var startLengthOfMessage = cursor.AsOffset();
RecordType.ApplicationData.WriteBytes(cursor);
ProtocolVersion.Tls12.WriteBytes(cursor);
return(RecordLength.StartEncryptedWriting(cursor, startLengthOfMessage, type, aead, sequenceNumber));
}
public static bool TryParse(MemoryCursor cursor, RecordType type, out Record result)
{
result = new Record();
if (!RecordType.TrySlice(cursor, type))
{
return(false);
}
var protocolVersion = ProtocolVersion.Parse(cursor);
var body = RecordLength.SliceBytes(cursor);
result = new Record(type, protocolVersion, body);
return(true);
}
public static void SliceUnknown(MemoryCursor cursor)
{
RecordType.Parse(cursor);
ProtocolVersion.Parse(cursor);
RecordLength.SliceBytes(cursor);
}
