Here's a link to the version 2.0 spec I've put together. It includes v2.0 start-up messages for dataEncoder negotiation (used by presentation layer) and corrections to MessageType assigned numbers for data headers, so impl and spec match. Unfortunately the impl still has a few v2.0 issues, but v1.0 and vintage are still working and will not change in the future, tough perhaps deprecated. I'd welcome any feedback on content or accuracy, if anyone had a few cycles to spare ;)
Thank you for your consideration, Robert
cryptography@lists.squeakfoundation.org