Encrypt Storage

The Encrypt Storage is a wrapper for native Storage of browser.

Using the crypto-js library as an encryption engine, it saves the encrypted data on the selected storage in the same way as the native Storage.

NOTE: Nothing on the front end is entirely secure. The library's proposal is to make it difficult for the user to see the data through the console, but as the secret key is on the front end, if the user searches hard enough, he will end up finding it. Just to make it clear that nothing is completely secure on the front end. Thank you for your attention.

Table of Contents

• Encrypt Storage
  • Table of Contents
  • Features
  • Installing
  • Examples
    • CommonJS
    • JS Import (es6)
    • Conventions
  • Parameters
    • secretKey
    • options
  • Usage
    • setItem
    • getItem
    • removeItem
    • removeItemFromPattern
    • clear
    • key
    • length
    • encryptString
    • decryptString
• License

Features

• Save encrypted data in localStorage and sessionStorage
• Recover encrypted data
• Use in the same way as native Storage
• Use with stateManagement persisters (vuex-persist and redux-persist)

Installing

To run this project in the development mode, you'll need to have a basic environment with NodeJs and Yarn installed.

Using npm:

$ npm install encrypt-storage

Or yarn:

$ yarn add encrypt-storage

Examples

CommonJS

const { EncryptStorage } = require('encrypt-storage');

const encryptStorage = EncryptStorage('secret_key', options);

module.exports = encryptStorage

JS Import (es6)

import { EncryptStorage } from 'encrypt-storage';

export const encryptStorage = EncryptStorage('secret_key', options);

Conventions

Create a file in your utils folder or a folder of your choice. But I advise you to use it as a singleton, so to speak, for better use.

📦 src
 ┣ 📂 utils
 ┃ ┗ 📜 index.ts
 ┗ 📜 index.ts

Directory Layout

// const { EncryptStorage } = require('encrypt-storage');

export const encryptStorage = EncryptStorage('secret_key', options)

Parameters

secretKey

The secretKey parameter is a string you encrypt your data. If you use a framework like ReactJS or VueJS prefer to store this data in your application's .env file:

// const { EncryptStorage } = require('encrypt-storage');

export const encryptStorage = EncryptStorage(process.env.SECRET_KEY, options)

options

The options object consists of the following properties:

key	type	default
prefix	string	null
storageType	localStorage or sessionStorage	localStorage
stateManagementUse	boolean	false

prefix: default null - is optional and is the prefix of all keys used in the selected storage as shown below:

//...
export const encryptStorage = EncryptStorage('secret_key', {
  ...,
  prefix: '@prefix'
});

in your storage:

stateManagementUse: default false - is a boolean value that, when true allows the use of it with vuex-persist and redux-persist:

redux-persist

...
const persistConfig = {
  key: 'root',
  storage: encryptStorage,
  whitelist: ['navigation'],
  ...
};

vuex-persist

...
const vuexLocal = new VuexPersistence({
  storage: encryptStorage
})

storageType: default localStorage - is the type of storage that will be used, at the moment only localStorage and sessionStorage are allowed:

//...
export const encryptStorage = EncryptStorage('secret_key', {
  ...,
  storageType: 'sessionStorage'
});

Usage

The usage follows the premise that encryptStorage has been "instantiated" in another file. In the example, the utils folder is used and JS imports.

setItem

...
import { encryptStorage } from './utils';

encryptStorage.setItem('user', { name: 'John', age: 36 });

getItem

the getItem function is slightly different from the native api because it does not need to have its data treated, when the data exists, by JSON.parse as follows:

...
encryptStorage.setItem('user', { name: 'John', age: 36 });
const decryptedData = encryptStorage.getItem('user');

// { name: 'John', age: 36 } (is an object Javascript, not a string)

removeItem

Remove an item from selectedStorage

...
encryptStorage.removeItem('user');

removeItemFromPattern

Remove an item from selectedStorage

...
encryptStorage.setItem('12345678:user', { id: 1234 });
encryptStorage.setItem('12345678:item', { id: 5678 });

encryptStorage.removeItemFromPattern('12345678');

// items '12345678:user' and '12345678:item' are removed from 'selectedStorage'

clear

Clear all data from selectedStorage

...
encryptStorage.clear();

key

Returns a key of index param or null if not exists

...
encryptStorage.key(0);

length

Returns a quantity of keys existents in selectedStorage

...
encryptStorage.length;

encryptString

Encrypt any string and rerturn encrypted value

...
import { encryptStorage } from './utils';

const encryptedValue = encryptStorage.encryptString('any_string');
// 'U2FsdGVkX1/jvF6fLkGI3aALI9ssWNAPAeZ5nxeskh8='

decryptString

Decrypt any string (encrypted with encryptString) and return decrypted value

...
import { encryptStorage } from './utils';

const decryptedValue = encryptStorage.decryptString('U2FsdGVkX1/jvF6fLkGI3aALI9ssWNAPAeZ5nxeskh8=');
// 'any_string'

License

MIT License