AES-256-GCM encryption/decryption shortcuts

A static class that simplifies encryption/decryption using the AES 256 GCM algorithm.

Just use a one-liner to encrypt or decrypt - the IV and tag are handled automatically.

Example

const Aes = require('aes-256-gcm');

// Must be 32 bytes.
const SHARED_SECRET = '12345678901234567890123456789012';

// Encrypt:
let { ciphertext, iv, tag } = Aes.encrypt('hi', SHARED_SECRET);

//   ciphertext: 'VOE='
//   iv: '0K6oPWsBAHLXYtLu5VAvsQ=='
//   tag: 'hCae3Lt5sAK3oNAnUh5emA==' 


// Decrypt:
let cleartext = Aes.decrypt(ciphertext, iv, tag, SHARED_SECRET;

// `cleartext` contains:
// 'hi'

Methods

static encrypt(text, secret)

Encrypts the text using the 256-bit shared key (secret) and returns an object containing three base64-encoded strings:

{ 
  "ciphertext": "(string)", 
  "iv": "(string)", 
  "tag": "(string)"
}

All of those strings must be passed to the end user to successfully decrypt the text.

static decrypt(ciphertext, iv, tag, secret)

Decrypts the ciphertext using the iv and authentication tag tag received from the encryption function, and using the 256-bit shared key (secret).

Returns the decoded string.