Revise EstablishIntro messages so that they can generate and check their MAC and signature.
This branch is built on top of my more_hs_msgs
branch (!1038 (merged)); only the last few commits are new. You'll want to review that one first.
This branch is built on top of my more_hs_msgs
branch (!1038 (merged)); only the last few commits are new. You'll want to review that one first.