Ancient Tome

A simple tool for storing secrets.

warning

This is under development and has not been audited yet. Currently uses the WebCrypto API, so it only works in modern browsers.

Crypto flow:

These are the cryptograph flows used by AncientTome:

init: salt + password --(bcrypt)--> hash --(AES-GCM)--> AES key
init: salt + password --(bcrypt)--> hash --(HMAC+SHA256)--> HMAC key
obfuscate keys: plainText --(HMAC+SHA256)--> cypherText
encrypt values: plainText --(AES-GCM)--> cypherText

The salt is randomly generated on first use and stored in plaintext. The password is provided by the user and stored in their head.

Usage:

localStorage

If you want to use localStorage a wrapper is provided for you. While localStorage is synchronous, encryption is asynchronous, so read methods require a callback. Write methods have an optional callback called on completion.

var AncientLocal = require('ancient-tome/local')
 
var secureLocalStorage = AncientLocal()
 
secureLocalStorage.open(password, function(error) {
 
  secureLocalStorage.setItem('journal', 'dear diary...', function(err){ ... })
  secureLocalStorage.getItem('bank info', function(err, plaintext){ ... })
 
})

Custom Storage

You can use whatever key-value storage mechanism you want. Reading non-existant keys should return a falsy value, not error. The first argument of callbacks should be the error or a falsy value. Here is a custom storage example:

var AncientTome = require('ancient-tome')
 
var myTome = AncientTome()
 
myTome._get = function(key, cb){ ... }
myTome._set = function(key, value, cb){ ... }
myTome._remove = function(key, cb){ ... }

Extras:

With obfuscated keys, its hard to keep track of what's been stored. Use the TomeIndexer to augment a tome with a simple index. Be sure to do this after if you are overriding get/set methods.

var AncientTome = require('ancient-tome')
var TomeIndexer = require('ancient-tome/indexer')
 
var myTome = AncientTome()
TomeIndexer(myTome)
 
myTome.open(password, function(){
  myTome.index() //=> ['journal', 'bank info']
})