XOR Cipher for as Nuxt Plugin

XORVuePlugin.js

/* eslint-disable one-var */
/* eslint-disable camelcase */
/* eslint-disable unicorn/number-literal-case */
import Vue from 'vue'
import { map } from 'lodash'

// inspired from here: https://gist.github.com/sukima/5613286

const b64_table =
  'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='

const Encrypt = (key, data) => b64_encode(xor_encrypt(key, data))
const Decrypt = (key, data) => xor_decrypt(key, b64_decode(data))

function b64_encode(data) {
  let o1,
    o2,
    o3,
    h1,
    h2,
    h3,
    h4,
    bits,
    i = 0,
    enc = ''
  if (!data) {
    return data
  }
  do {
    o1 = data[i++]
    o2 = data[i++]
    o3 = data[i++]
    bits = (o1 << 16) | (o2 << 8) | o3
    h1 = (bits >> 18) & 0x3f
    h2 = (bits >> 12) & 0x3f
    h3 = (bits >> 6) & 0x3f
    h4 = bits & 0x3f
    enc +=
      b64_table.charAt(h1) +
      b64_table.charAt(h2) +
      b64_table.charAt(h3) +
      b64_table.charAt(h4)
  } while (i < data.length)
  const r = data.length % 3
  return (r ? enc.slice(0, r - 3) : enc) + '==='.slice(r || 3)
}

function b64_decode(data) {
  let o1,
    o2,
    o3,
    h1,
    h2,
    h3,
    h4,
    bits,
    i = 0
  const result = []
  if (!data) {
    return data
  }
  data += ''
  do {
    h1 = b64_table.indexOf(data.charAt(i++))
    h2 = b64_table.indexOf(data.charAt(i++))
    h3 = b64_table.indexOf(data.charAt(i++))
    h4 = b64_table.indexOf(data.charAt(i++))
    bits = (h1 << 18) | (h2 << 12) | (h3 << 6) | h4
    o1 = (bits >> 16) & 0xff
    o2 = (bits >> 8) & 0xff
    o3 = bits & 0xff
    result.push(o1)
    if (h3 !== 64) {
      result.push(o2)
      if (h4 !== 64) {
        result.push(o3)
      }
    }
  } while (i < data.length)
  return result
}

function keyCharAt(key, i) {
  return key.charCodeAt(Math.floor(i % key.length))
}

function xor_encrypt(key, data) {
  return map(data, function(c, i) {
    return c.charCodeAt(0) ^ keyCharAt(key, i)
  })
}

function xor_decrypt(key, data) {
  return map(data, function(c, i) {
    return String.fromCharCode(c ^ keyCharAt(key, i))
  }).join('')
}

Vue.filter('XOREncrypt', Encrypt)
Vue.filter('XORDecrypt', Decrypt)

// inject to context to be able to use across client-server
// see: https://nuxtjs.org/guide/plugins/#inject-into-context

export default ({ app }) => {
  app.$XOR = {
    Decrypt,
    Encrypt
  }
}