[js: crypto] Node.js encryption library. #js

crypto.js

import {
  createCipheriv,
  createDecipheriv,
} from 'crypto'

const PASSWORD = 'xxxxxxxxx'
const SALT = 'xxxxxxxxx'
const CIPHER_KEY = crypto.scryptSync(PASSWORD, SALT, 32).toString('hex')
const CIPHER_IV = crypto.randomBytes(16).toString('hex')

// ↑ まで事前に作っておいて環境変数とかにつっこむ

const ALGO = 'aes-256-cbc'
const KEY = Buffer.from(process.env.CIPHER_KEY || '', 'hex')
const IV = Buffer.from(process.env.CIPHER_IV || '', 'hex')

export const encryptPassword = (password: string) => {
  let crypted
  
  // 都度生成が必要っぽい
  // https://stackoverflow.com/questions/51280576/trying-to-add-data-in-unsupported-state-at-cipher-update
  const cipher = createCipheriv(ALGO, KEY, IV)
  crypted = cipher.update(password, 'utf-8', 'hex')
  crypted += cipher.final('hex')

  return crypted
}

export const decryptPassword = (encrypted: string) => {
  let decrypted
  const decipher = createDecipheriv(ALGO, KEY, IV)
  decrypted = decipher.update(encrypted, 'hex', 'utf-8')
  decrypted += decipher.final('utf-8')

  return decrypted
}