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Close chainKey.key

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This commit is contained in:
Matt Corallo 2014-06-09 20:14:52 -04:00
parent 53a58f5b39
commit ceca03c5d0
1 changed files with 12 additions and 12 deletions
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24
js/crypto.js
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@ -17,6 +17,8 @@
window.textsecure = window.textsecure || {};
window.textsecure.crypto = function() {
'use strict';
var self = {};
// functions exposed for replacement and direct calling in test code
var testing_only = {};
@ -28,16 +30,12 @@ window.textsecure.crypto = function() {
var MESSAGE_LOST_THRESHOLD_MS = 1000*60*60*24*7;
var getRandomBytes = function(size) {
//TODO: Better random (https://www.grc.com/r&d/js.htm?)
try {
var buffer = new ArrayBuffer(size);
var array = new Uint8Array(buffer);
window.crypto.getRandomValues(array);
return buffer;
} catch (err) {
//TODO: ummm...wat?
throw err;
}
// At some point we might consider XORing in hashes of random
// UI events to strengthen ourselves against RNG flaws in crypto.getRandomValues
// ie maybe take a look at how Gibson does it at https://www.grc.com/r&d/js.htm
var array = new Uint8Array(size);
window.crypto.getRandomValues(array);
return array.buffer;
}
self.getRandomBytes = getRandomBytes;
@ -392,7 +390,9 @@ window.textsecure.crypto = function() {
var closeSession = function(session) {
// Clear any data which would allow session continuation:
// Lock down current receive ratchet
// TODO: Some kind of delete chainKey['key']
for (key in session)
if (key.chainKey !== undefined && key.chainKey.key !== undefined)
delete key.chainKey.key;
// Delete current sending ratchet
delete session[getString(session.currentRatchet.ephemeralKeyPair.pubKey)];
// Delete current root key and our ephemeral key pair
@ -535,7 +535,7 @@ window.textsecure.crypto = function() {
var previousRatchet = session[getString(ratchet.lastRemoteEphemeralKey)];
if (previousRatchet !== undefined) {
return fillMessageKeys(previousRatchet, previousCounter).then(function() {
delete previousRatchet.chainKey['key'];
delete previousRatchet.chainKey.key;
if (!objectContainsKeys(previousRatchet.messageKeys))
delete session[getString(ratchet.lastRemoteEphemeralKey)];
else