EMS_partA

ems_parta.js

// create new Kyber objects
const KYBOBJECT = await new KYBLIB.Kyber.empty()

// Take a 32 byte seed, s
const s = Crypto.randomBytes(32)

// Create a random 32 byte key, k
const k = Crypto.randomBytes(32)

var textBytes = aesjs.utils.utf8.toBytes(s)
var aesCtr = new aesjs.ModeOfOperation.ctr(k)
// AES256 encrypt s with k to create payload, p
var p = aesCtr.encrypt(textBytes)

const aespk = Buffer.from(k.toString('hex'))
// Kyber encode k to ke
KYBOBJECT.kem_encode(aespk)
const ke = KYBOBJECT.getCypherText()

// Generating ECIES key pair (we will retrieve them from the chain)
var privateKey = eccrypto.generatePrivate()
var publicKey = eccrypto.getPublic(privateKey)
// ECIES encrypt ke to kee
eccrypto.encrypt(publicKey, Buffer.from(ke)).then(function (kee) {
  spinner.succeed('DONE')
  // sending kee and p to Recipient
})