otpus/testing/encryptMessage.js

General purpose cipher for Node & browser

// import {  encryptMessage, decryptMessage } from '../src/index.js'
import { encryptMessage, decryptMessage } from 'otpus'

const plainText = 'this is sercret message'
const keyStr = 'this is secret key'

const encPack = encryptMessage(plainText, keyStr)

prn('encMsg: A', encPack)

// encPack = messageModification( encPack )

const decMsg = decryptMessage(encPack, keyStr)

if (decMsg) { // success
  prn('decMsg:', decMsg)
} else { // return undefined  when fail.
  prn('data is corrupted.')
}

function messageModification (dataOrg) {
  const data = Buffer.from(dataOrg, 'base64')
  data[10] ^= 0x01 // modify one byte.
  return data.toString('base64')
}

// prn( 'encMsg', MBP.hex( encMsg ))

function prn (...args) {
  console.log(...args)
}