strappCrypto.js

   1 /**
   2  * @file      Management for bootstrapp cryptography
   3  * @desc      Makes keys, encrypts and decrypts messages
   4  *
   5  * @author    Jordan Lavatai and Ken Grimes
   6  * @version   0.0.1
   7  * @license   AGPL-3.0
   8  * @copyright Strapp.io
   9  */
  10
  11 /* TODO: Replace with filesystem operations */
  12 import {setItem, getItem} from "localForage"
  13
  14 /** @func Generates a CryptoKey and returns a SHA-256 client key
  15  *  @desc Utilizes Web Crypto to create a CryptoKey using RSA specification.
  16  *        Stores both public and private representation of the key and returns
  17  *        the public key
  18  *  @return {String} clientKey
  19  */
  20 function generateKey() {
  21   crypto.subtle.generateKey(
  22     { name:'RSA-OAEP',
  23       modulusLength: 2048,
  24       publicExponent: new Uint8Array([0x01, 0x00, 0x01]),
  25       hash: {name: "SHA-256"}
  26     },
  27     true,
  28     ['encrypt', 'decrypt']
  29   ).then((cryptoKey) => {
  30     /* TODO: Do we need to store the private key as well? */
  31     crypto.subtle.exportKey('jwk', cryptoKey)
  32       .then((exportedKey) => {
  33         setItem('publicKey', exportedKey.publicKey)
  34         setItem('privateKey', exportedKey.privateKey)
  35         console.log('public key is' + getItem('publicKey'))
  36         console.log('private key is' + getItem('privateKey'))
  37         return exportedKey.publicKey
  38       })
  39   })
  40 }
  41
  42 /** @func Encrypts data with a public key assuming RSA
  43  *  @desc https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/encrypt
  44  *  @arg {String} Public Key
  45  *  @return {Object} The encrypted data as a promise
  46  */
  47 function encryptData(publicKey, data) {
  48   return crypto.subtle.encrypt({"name": "RSA-OAEP"})
  49 }
  50 /** @func Decrypts data with a private key
  51  *  @desc https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/decrypt
  52  *  @arg {String} Private key to decrypt data
  53  *  @return {Object} The decrypted data as a promise
  54  */
  55 function decryptData(privateKey, cipherText) {
  56   /* TODO: Pass in private key or get it from localForage? */
  57   return crypto.subtle.decrypt({"name":"RSA-OAEP"}, privateKey, cipherText)
  58 }
  59
  60