How to use the chloride.crypto_box_keypair function in chloride

var tape = require('tape')
var crypto = require('crypto')

var c = require('../')
var sodium = require('chloride')

var keypair = sodium.crypto_box_keypair

var alice = keypair()
var bob   = keypair()

function arrayOfSize (n) {
  return new Array(n+1).join('0').split('')
}

tape('simple', function (t) {

  var msg = new Buffer('hello there!')
  var ctxt = c.multibox(msg, [alice.publicKey, bob.publicKey])
  console.log(ctxt)

  ;[alice.secretKey, bob.secretKey].forEach(function (sk) {

var sodium = require('chloride')
var scalarmult = sodium.crypto_scalarmult
var box  = sodium.crypto_box_easy
var secretbox = sodium.crypto_secretbox_easy
var secretbox_open = sodium.crypto_secretbox_open_easy
var keypair = sodium.crypto_box_keypair
var concat = Buffer.concat

function randombytes(n) {
  var b = new Buffer(n)
  sodium.randombytes(b)
  return b
}

function setMax (m) {
  m = m || DEFAULT_MAX
  if (m < 1 || m > 255)
    throw new Error('max recipients must be between 0 and 255.')
  return m
}