dark crystal factotum feature

protocol spec

dark crystal specifies protocol buffers as a "standard encoding", but we already have bencoding standardized message encoding via bit torrent. which also has many implementations and is far more trivial to write enc/dec code for anyway.

primitives in tweetnacl

• 6.3 nonce||mac||box_key(msg) → crypto_box_curve25519xsalsa20poly1305, crypto_box_curve25519xsalsa20poly1305_open
• 6.4 crypto_sign_ed25519
• 6.5 HMAC_pk.sk(sender_pk||recipient_pk||context) → secret_box?
• 6.6 blake2b❌ sha512✔️
• 6.7 "key derivation [...] is regarded by many cryptographers as bad practice and is not recommended if it can be avoided."
• 8 choosing a threshold-based secret sharing algorithm