bittorrent-dht-store-keypair

Setting up elliptic curve keys and signing properly for BEP44 can be tricky, especially since bittorrent uses the more obscure supercop/ref10 instead of sodium/nacl ed25519 key formatting.

example

quick example

var KP = require('bittorrent-dht-store-keypair')
var DHT = require('bittorrent-dht')

var dht = new DHT({ verify: KP.verify })
var kp = KP()

var value = 'beep boop'
dht.once('ready', function () {
  dht.put(kp.store(value), function (errors, hash) {
    if (errors.length) errors.forEach(console.log)
    else console.log(kp.id)
  })
})

save and load a key from a file

var KP = require('bittorrent-dht-store-keypair')
var kp = KP()
console.log(JSON.stringify({
  publicKey: kp.publicKey.toString('hex'),
  secretKey: kp.secretKey.toString('hex')
}))

$ node generate.js > keypair.json

var KP = require('bittorrent-dht-store-keypair')
var DHT = require('bittorrent-dht')
var path = require('path')
var concat = require('concat-stream')

var dht = new DHT({ verify: KP.verify })
var kp = KP(require(path.resolve(process.argv[2])))

dht.once('ready', function () {
  process.stdin.pipe(concat(function (value) {
    dht.put(kp.store(value), function (errors, hash) {
      if (errors.length) errors.forEach(console.log)
      else console.log(kp.id)
    })
  }))
})

$ echo wow cool | node put.js keypair.json

api

var KP = require('bittorrent-dht-store-keypair')

var kp = KP(opts)

• opts.publicKey - create kp with a buffer or hex string public key
• opts.secretKey - create kp with a buffer or hex string private key
• opts.seq - sequence to start at in kp.store()

var signature = kp.sign(value)

Sign a buffer or string value with the private key.

var putOpts = kp.store(value, opts)

Create the putOpts for a value to pass into bittorrent-dht's put() function.

kp.seq is incremented here unless opts.seq is provided.

kp.publicKey

public key (32 bytes)

kp.secretKey

private key (64 bytes)

kp.id

sha1 hash of the kp.publicKey

kp.seq

sequence number

KP.verify

The underlying ed25519-supercop verify function. This is handy to pass into the bittorrent-dht constructor as the verify parameter:

var DHT = require('bittorrent-dht')
var KP = require('bittorrent-dht-store-keypair')
var dht = new DHT({ verify: KP.verify })

install

npm install bittorrent-dht-store-keypair

license

MIT