Crypt-with-iv

crypt.js

const crypto = require('crypto')
const alg = 'aes-256-ctr'
const pwd = 'abcdabcdabcdabcdabcdabcdabcdabcd'

function crypt(text){
  const iv = crypto.randomBytes(16)
  const cipher = crypto.createCipheriv(alg, pwd, iv)
  const crypted = cipher.update(text, 'utf8', 'hex') + cipher.final('hex')
  return iv.toString('hex')+':'+crypted
}
function decrypt(text){
  const parts = text.split(':')
  const decipher = crypto.createDecipheriv(alg, pwd, new Buffer(parts[0], 'hex'))
  const plain = decipher.update(parts[1], 'hex', 'utf8') + decipher.final('utf8')
  return plain
}

const text = 'tulio faria devpleno'
const criptografado1 = crypt(text)
const criptografado2 = crypt(text)
const criptografado3 = crypt(text)

console.log(text, '<< criptografado >>', criptografado1)
console.log(text, '<< criptografado >>', criptografado2)
console.log(text, '<< criptografado >>', criptografado3)

console.log(criptografado1, '<< em texto >>', decrypt(criptografado1))
console.log(criptografado2, '<< em texto >>', decrypt(criptografado2))
console.log(criptografado3, '<< em texto >>', decrypt(criptografado3))