authenzify/src/util/encryption.js

server to manage authentication authorization of users and more

import { promisify } from 'util'
import { randomBytes, scrypt } from 'crypto'
const scryptPromisify = promisify(scrypt)

const keyLength = 64
const baseFormat = 'hex'

export const getSalt = (length) => {
  return randomBytes(length)
}

export const getSaltHex = (length) => {
  return getSalt(length).toString(baseFormat)
}

const getEncryptedBuffer = async ({ expression, salt }) => {
  const encryptedExpression = await scryptPromisify(expression, salt, keyLength)

  return encryptedExpression
}

export const encrypt = async ({ expression, salt, passwordPrivateKey }) => {
  const encryptedExpression = await getEncryptedBuffer({
    expression,
    salt: `${salt}${passwordPrivateKey ? passwordPrivateKey : ''}`,
  })

  return encryptedExpression.toString(baseFormat)
}

export const doesPasswordMatch = async ({
  password,
  encryptedPassword,
  salt,
  passwordPrivateKey,
}) => {
  const encryptedCurrentPassword = await getEncryptedBuffer({
    expression: password,
    salt: `${salt}${passwordPrivateKey ? passwordPrivateKey : ''}`,
  })
  const isMatch = encryptedCurrentPassword.equals(
    Buffer.from(encryptedPassword, baseFormat),
  )
  return isMatch
}