DHT with sodium-native

index.js

const sodium = require('sodium-native')
const DHT = require('bittorrent-dht')
const dht = new DHT({
  verify: sodium.crypto_sign_verify_detached
})

const keys = keygen()

dht.put({
  v: Buffer.from('Hello world'),
  k: keys.pk,
  seq: 0,
  sign: (msg) => {
    const sig = Buffer.alloc(sodium.crypto_sign_BYTES)
    sodium.crypto_sign_detached(sig, msg, keys.sk)
    return sig
  }
}, function (err, prev) {
  // ...
})

// Optionally pass an exisiting secret key and rederive the public key
function keygen (sk) {
  const pk = Buffer.alloc(sodium.crypto_sign_PUBLICKEYBYTES)
  if (sk == null) {
    sk = sodium.sodium_malloc(sodium.crypto_sign_SECRETKEYBYTES)
    sodium.crypto_sign_keypair(pk, sk)
  } else {
    sodium.crypto_sign_ed25519_sk_to_pk(pk, sk)
  }

  return { pk, sk }
}