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Also delete chain key

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This commit is contained in:
Matt Corallo 2014-05-14 03:33:24 -04:00
parent 08093a206d
commit cdebc8afb4
1 changed files with 21 additions and 17 deletions
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38
js/crypto.js
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@ -251,7 +251,7 @@ window.crypto = (function() {
var preKeyPair = crypto_storage.getAndRemovePreKeyPair(message.preKeyId);
if (preKeyPair === undefined) {
if (crypto_storage.getSession(encodedNumber) !== undefined)
return new Promise(function(resolve) { resolve() });
return Promise.resolve();
else
throw new Error("Missing preKey for PreKeyWhisperMessage");
} else
@ -260,23 +260,26 @@ window.crypto = (function() {
var fillMessageKeys = function(chain, counter) {
if (chain.chainKey.counter + 1000 < counter) //TODO: maybe 1000 is too low/high in some cases?
return new Promise(function(resolve) { resolve() }); // Stalker, much?
return Promise.resolve(); // Stalker, much?
if (chain.chainKey.counter < counter) {
var key = toArrayBuffer(chain.chainKey.key);
var byteArray = new Uint8Array(1);
byteArray[0] = 1;
return HmacSHA256(key, byteArray.buffer).then(function(mac) {
byteArray[0] = 2;
return HmacSHA256(key, byteArray.buffer).then(function(key) {
chain.messageKeys[chain.chainKey.counter + 1] = mac;
chain.chainKey.key = key
chain.chainKey.counter += 1;
return fillMessageKeys(chain, counter);
});
if (chain.chainKey.counter >= counter)
return Promise.resolve(); // Already calculated
if (chain.chainKey.key === undefined)
throw new Error("Got invalid request to extend chain after it was already closed");
var key = toArrayBuffer(chain.chainKey.key);
var byteArray = new Uint8Array(1);
byteArray[0] = 1;
return HmacSHA256(key, byteArray.buffer).then(function(mac) {
byteArray[0] = 2;
return HmacSHA256(key, byteArray.buffer).then(function(key) {
chain.messageKeys[chain.chainKey.counter + 1] = mac;
chain.chainKey.key = key
chain.chainKey.counter += 1;
return fillMessageKeys(chain, counter);
});
} else
return new Promise(function(resolve) { resolve() });
});
}
var removeOldChains = function(session) {
@ -300,7 +303,7 @@ window.crypto = (function() {
var maybeStepRatchet = function(session, remoteKey, previousCounter) {
if (session[getString(remoteKey)] !== undefined)
return new Promise(function(resolve) { resolve() });
return Promise.resolve();
var ratchet = session.currentRatchet;
@ -328,6 +331,7 @@ window.crypto = (function() {
var previousRatchet = session[getString(ratchet.lastRemoteEphemeralKey)];
if (previousRatchet !== undefined) {
return fillMessageKeys(previousRatchet, previousCounter).then(function() {
delete previousRatchet.chainKey['key'];
if (!objectContainsKeys(previousRatchet.messageKeys))
delete session[getString(ratchet.lastRemoteEphemeralKey)];
else