Sodium_fmt.BoxBox defines formatters for types defined in Sodium.Box.
secret_key formats a secret_key in this fashion: (Box.secret_key AAAAAA==).
public_key formats a public_key in this fashion: (Box.public_key AAAAAA==).
channel_key formats a channel_key in this fashion: (Box.channel_key AAAAAA==).
nonce formats a nonce in this fashion: (Box.nonce AAAAAA==).
keypair formats a keypair in this fashion: ((Box.secret_key AAAAAA==) (Box.public_key AAAAAA==)).
module type S = sig ... endBytes offers versions of each of the above formatters, which get their value from a bytes value.