protected void Decrypt(ref ReadableBuffer messageBuffer)
{
if (messageBuffer.IsSingleSpan)
{
_key.Finish(messageBuffer.First.Span);
IncrementSequence();
return;
}
var bytesRemaining = messageBuffer.Length;
foreach (var b in messageBuffer)
{
if (b.Length == 0)
{
continue;
}
bytesRemaining -= b.Length;
if (bytesRemaining == 0)
{
_key.Finish(b.Span);
break;
}
_key.Update(b.Span);
}
IncrementSequence();
}
public unsafe void EncryptSessionKey(ref WritableBuffer writer, Span <byte> ticketContent)
{
var tagLength = 16;
lock (_key)
{
var contentLength = ticketContent.Length + tagLength + sizeof(long) + sizeof(Guid);
var nonce = System.Threading.Interlocked.Increment(ref _nounceCounter);
writer.WriteBigEndian((ushort)contentLength);
writer.Ensure(contentLength);
_key.IV.Slice(4).Span.Write(nonce);
_key.Init(KeyMode.Encryption);
writer.WriteBigEndian(_keyGuid);
writer.WriteBigEndian(_nounceCounter);
var amountWritten = _key.Finish(ticketContent, writer.Buffer.Span);
writer.Advance(amountWritten);
_key.GetTag(writer.Buffer.Span.Slice(0, tagLength));
writer.Advance(tagLength);
}
}
