michaelyali/cryptopeer-crypto

Introduction

cryptopeer-crypto is an ECMA2015 (ES6) crypto library for Node.js built on top of sodium and node-rsa

Install

$ npm install cryptopeer-crypto

Usage

const crypto = require('cryptopeer-crypto');

ECDH with new keys

let alice = new crypto.ECDH(),
    bob = new crypto.ECDH();

let aliceShared = alice.computeSecret(bob.publicKeyBuffer, 'base64'),
    bobShared = bob.computeSecret(alice.publicKeyBuffer, 'base64');

console.log(aliceShared === bobShared);

ECDH from existing privateKey

let alice = new crypto.ECDH(),
    mallory = crypto.ECDH.fromPrivateKey(alice.privateKey, 'base64');

console.log(alice.publicKey === mallory.publicKey);

RSA

let alice = new crypto.RSA(512),
    bob = new crypto.RSA(), // keyLength 512 is set to defalult
    message = 'Hello Bob!';

alice.setPublicKey(bob.publicKey);

let encrypted = alice.encrypt(message),
    decrypted = bob.decrypt(encrypted);

console.log(decrypted === message);

Method encrypt expects String, Number, Object, Array, null or can be empty.

ChaCha20

const ChaCha20 = crypto.ChaCha20;

let message = 'Super secret message',
    key = ChaCha20.getKey(),
    nonce = ChaCha20.getNonce();

let encrypted = ChaCha20.encrypt(message, nonce, key),
    decrypted = ChaCha20.decrypt(encrypted, nonce, key).toString('utf8');

console.log(decrypted === message);

ChaCha20 with ECDH

const ChaCha20 = crypto.ChaCha20,
      ECDH = crypto.ECDH;

let message = 'Hello Bob!';

let aliceSecret = alice.computeSecret(bob.publicKey),
    aliceKey = ChaCha20.getKey(aliceSecret),
    nonce = ChaCha20.getNonce();

let encrypted = ChaCha20.encrypt(message, nonce, aliceKey);

let bobSecret = bob.computeSecret(alice.publicKey),
    bobKey = ChaCha20.getKey(bobSecret);

let decrypted = ChaCha20.decrypt(encrypted, nonce, bobKey).toString('utf8');

console.log(decrypted === message);

Method encrypt expects Buffer, String. Method decrypt expects Buffer, encoded String.

With Promises

All methods has been promisified already. You can call them with *Async ending. e.g. alice.computeSecretAsync(), ChaCha20.encryptAsync() and so on.

TODO

• AES256 encrypt/decrypt

Test

npm test

Thanks

Thanks to ecdh-sodium for inspiration.

License

The MIT License (MIT)

Copyright (c) 2016 Michael Yali

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.