Supporting non x86_64

[kazu-yamamoto]

fusion can be used only on x86_64 (including amd64). It is necessary to fall back to cryptonite on other architectures as used to do (69e1dac63841caf06c28c979276ff3af08654260).

[kazu-yamamoto]

• [ ] Three buffers should be included in Context. This breaks the bracket pattern but is inevitable, sigh.
  • [ ] check the leak of three buffers.
• [ ] Define a type class which method is encrypt and decrypt:
  • [ ] encrypt :: a -> a -> PacketNumber -> a
  • [x] decrypt :: CipherText -> AssDat -> PacketNumber -> IO (Maybe PlainText)
  • [ ] Buffer: Server.Reader, genCoder and test/PacketSpec.hs.
  • [x] decodeFrames :: ByteString -> IO (Maybe [Frame])
• [ ] encodePacket should come back
• [x] Remove decrypt from dispatcher to fix the race.

Consider

• [ ] Protector
• [ ] Send :: b -> IO ()
  • [ ] Int -> IO ()
  • [ ] [ByteString] -> IO ()