crypto = require('crypto')
key = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
iv = new Buffer(16)
iv.fill(0)

text = 'text'

cipher = crypto.createCipheriv('aes-256-cbc', key, iv)
output = cipher.update('text', 'utf8', 'base64')
output += cipher.final('base64')

console.log output # => QfpLKBn20BZI1NIhigOo6g==