Crypt

A very simple package for encrypting communications between server and client.

Description

The library has two modules - for the server and for the client, so that you can use secure encrypted data exchange not only between the API, but also with the frontend.

Usage on serverside

First of all install lib:

npm i @gratio/crypt

Usage example:

import Crypt from '@gratio/crypt';

const { encryptMsg, decryptMsg, generateCommonKey } = Crypt.serverCrypt;
const pass_in_base64 = 'U0VDUkVUX1BBU1M='; // Base64 encrypted pass
const generated_key = generateCommonKey(); // Or use generated key (random base64 string)

const cipher = encryptMsg({
  message: {}, // Any serializable type (not a function!) e.g. {} | 'string' | []
  pass: pass_in_base64
}); // Return { data, v } witch you can stringify and send as a body

// Any encrypted message must has an `data` and `v` fields with base64 encoded strings
// data is encrypted data, v is an init vector
const decryptedString = decryptMsg({
  message: { data: 'string', v: 'string' },
  pass: pass_in_base64
}); // Return correct JSON-string

const decryptedData = JSON.parse(decryptedString); // return Initial data

pass_in_base64 - preferably a valid base64 string (but not strictly necessarily).
You can generate your own pass like this:

import Crypt from '@gratio/crypt';
const { pack } = Crypt.serverCrypt;
const your_pass = 'SECRET_PASS';

console.log(pack(your_pass)); // 'U0VDUkVUX1BBU1M='