@cbcheng/secure-ls

Secure sessionStorage or localStorage data with high level of encryption and data compression.

This package is adapted from softvar.

Features

• Secure data with various types of encryption including AES, DES, Rabbit and RC4. (defaults to Base64 encoding).
• Compress data before storing it to sessionStorage or localStorage to save extra bytes (defaults to true).
• Advanced API wrapper over sessionStorage or localStorage API, providing other basic utilities.
• Save data in multiple keys inside sessionStorage or localStorage , and secure-ls will always remember it's creation.

Quickstart

1. Install

$ npm install @cbcheng/secure-ls

2. Import

// ES6 module syntax
> import SecureLS from '@cbcheng/secure-ls';

// CommonJS syntax
> const SecureLS = require('@cbcheng/secure-ls');

Libraries used

• Encryption / Decryption using The Cipher Algorithms

  It requires secret-key for encrypting and decrypting data securely. If custom secret-key is provided as mentioned below in APIs, then the library will pick that otherwise it will generate yet another very secure unique password key using PBKDF2, which will be further used for future API requests.

  PBKDF2 is a password-based key derivation function. In many applications of cryptography, user security is ultimately dependent on a password, and because a password usually can't be used directly as a cryptographic key, some processing is required.

  A salt provides a large set of keys for any given password, and an iteration count increases the cost of producing keys from a password, thereby also increasing the difficulty of attack.

  Eg: 55e8f5585789191d350329b9ebcf2b11 and db51d35aad96610683d5a40a70b20c39.

  For the generation of such strings, secretPhrase is being used and can be found in code easily but that won't make it unsecure, PBKDF2's layer on top of that will handle security.

• Compresion / Decompression using lz-string

Usage

• Example 1: With default settings i.e. Base64 Encoding and Data Compression

> var ls = new SecureLS();
> ls.set('key1', {data: 'test'}); // set key1
> ls.get('key1'); // print data
  {data: 'test'}

• Example 2: With AES Encryption, sessionStorage and Data Compression

> var ls = new SecureLS({encodingType: 'aes'});
> ls.set('key1', {data: 'test'}); // set key1
> ls.get('key1'); // print data
  {data: 'test'}

> ls.set('key2', [1, 2, 3]); // set another key
> ls.getAllKeys(); // get all keys
  ["key1", "key2"]
> ls.removeAll(); // remove all keys

• Example 3: With RC4 Encryption but no Data Compression

> var ls = new SecureLS({encodingType: 'rc4', isCompression: false});
> ls.set('key1', {data: 'test'}); // set key1
> ls.get('key1'); // print data
  {data: 'test'}

> ls.set('key2', [1, 2, 3]); // set another key
> ls.getAllKeys(); // get all keys
  ["key1", "key2"]
> ls.removeAll(); // remove all keys

• Example 3: With DES Encryption, no Data Compression and custom secret key

> var ls = new SecureLS({encodingType: 'des', isCompression: false, encryptionSecret: 'my-secret-key'});
> ls.set('key1', {data: 'test'}); // set key1
> ls.get('key1'); // print data
  {data: 'test'}

> ls.set('key2', [1, 2, 3]); // set another key
> ls.getAllKeys(); // get all keys
  ["key1", "key2"]
> ls.removeAll(); // remove all keys

• Example 4: set storage with sessionStorage or localStorage.

> var ls = new SecureLS(); // default to use sessionStorage

> var ls = new SecureLS({storageType: 'sessionStorage'});  // use sessionStorage

> var ls = new SecureLS({storageType: 'localStorage'});  // use localStorage

API Documentation

Create an instance / reference before using.

var ls = new SecureLS();

Contructor accepts a configurable Object with all three keys being optional.

Config Keys	default	accepts
encodingType	Base64	base64/aes/des/rabbit/rc4/''
isCompression	true	true/false
encryptionSecret	PBKDF2 value	String
encryptionNamespace	null	String
storageType	sessionStorage	String sessionStorage/localStorage

Note: encryptionSecret will only be used for the Encryption and Decryption of data with AES, DES, RC4, RABBIT, and the library will discard it if no encoding / Base64 encoding method is choosen.

encryptionNamespace is used to make multiple instances with different encryptionSecret and/or different encryptionSecret possible.

var ls1 = new SecureLS({encodingType: 'des', encryptionSecret: 'my-secret-key-1'});
var ls2 = new SecureLS({encodingType: 'aes', encryptionSecret: 'my-secret-key-2'});

Examples:

• No config or empty Object i.e. Default Base64 Encoding and Data compression and sessionStorage

var ls = new SecureLS();
// or
var ls = new SecureLS({});

• No encoding No data compression i.e. Normal way of storing data

var ls = new SecureLS({encodingType: '', isCompression: false});

• Base64 encoding but no data compression

var ls = new SecureLS({isCompression: false});

• AES encryption and data compression

var ls = new SecureLS({encodingType: 'aes'});

• RC4 encryption and no data compression

var ls = new SecureLS({encodingType: 'rc4', isCompression: false});

• RABBIT encryption, no data compression and custom encryptionSecret

var ls = new SecureLS({encodingType: 'rc4', isCompression: false, encryptionSecret: 's3cr3tPa$$w0rd@123'});

Methods

• set

  Saves data in specifed key in localStorage. If the key is not provided, the library will warn. Following types of JavaScript objects are supported:

  • Array
  • ArrayBuffer
  • Blob
  • Float32Array
  • Float64Array
  • Int8Array
  • Int16Array
  • Int32Array
  • Number
  • Object
  • Uint8Array
  • Uint8ClampedArray
  • Uint16Array
  • Uint32Array
  • String

  Parameter	Description
  key	key to store data in
  data	data to be stored

    ls.set('key-name', {test: 'secure-ls'})
  

• get

  Gets data back from specified key from the localStorage library. If the key is not provided, the library will warn.

  Parameter	Description
  key	key in which data is stored

    ls.get('key-name')
  

• remove

  Removes the value of a key from the localStorage. If the meta key, which stores the list of keys, is tried to be removed even if there are other keys which were created by secure-ls library, the library will warn for the action.

  Parameter	Description
  key	remove key in which data is stored

    ls.remove('key-name')
  

• removeAll

  Removes all the keys that were created by the secure-ls library, even the meta key.

    ls.removeAll()
  

• clear

  Removes all the keys ever created for that particular domain. Remember localStorage works differently for http and https protocol;

    ls.clear()
  

• getAllKeys

  Gets the list of keys that were created using the secure-ls library. Helpful when data needs to be retrieved for all the keys or when keys name are not known(dynamically created keys).

  getAllKeys()

    ls.getAllKeys()
  

Contributing

1. Fork the repo on GitHub.
2. Clone the repo on machine.
3. Execute npm install and npm run dev.
4. Create a new branch <fix-typo> and do your work.
5. Run npm run build to build dist files and npm run test to ensure all test cases are passing.
6. Commit your changes to the branch.
7. Submit a Pull request.

Development Stack

• Webpack based src compilation & bundling and dist generation.
• ES6 as a source of writing code.
• Exports in a umd format so the library works everywhere.
• ES6 test setup with Mocha and Chai.
• Linting with ESLint.

Process

ES6 source files
       |
       |
    webpack
       |
       +--- babel, eslint
       |
  ready to use
     library
  in umd format

Credits

Many thanks to:

• @softvar for secure-ls.

• @brix for the awesome crypto-js library for encrypting and decrypting data securely.

• @pieroxy for the lz-string js library for data compression / decompression.

• @chinchang for the below open-source libraries which are used only for the Landing Page Development.

  • screenlog.js - Brings console.log on the page's screen.
  • superplaceholder.js - For super charging input placeholders.

Copyright and license

The MIT license (MIT)

Copyright (c) 2022 Zhang Bing Cheng