blob: 1a3938cbe528a548609520156fcff36029bc49d5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
/** \file
* \brief A cache for session and domain hashes, used for Farbling
*
* \author Copyright (C) 2021 Matus Svancar
* \author Copyright (C) 2021 Giorgio Maone
*
* \license SPDX-License-Identifier: GPL-3.0-or-later
*/
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
/**
* Object for generating and caching domain/session hashes
* getFor method used to get domain hashes from given url
*
* \note cached visited domains with related keys are only deleted after end of the session
*/
// depends on /nscl/common/CachedStorage.js
var Hashes = {
async getFor(url){
let site = getSiteForURL(url);
let {sessionHash, visitedDomains} = await CachedStorage.init({
sessionHash: null,
visitedDomains: {}
}, "Hashes");
this.sessionHash = sessionHash ??= gen_random64().toString();
let siteHashes = visitedDomains[site];
if (!siteHashes) {
let hmac = sha256.hmac.create(this.sessionHash);
hmac.update(site);
const domainHash = hmac.hex();
const hash = sha256.create();
hash.update(JSON.stringify(domainHash));
// Redefine the domainHash for incognito context:
// Compute the SHA256 hash of the original hash so that the incognito hash is:
// * significantly different to the original domainHash,
// * computationally difficult to revert,
// * the same for all incognito windows (for the same domain).
const incognitoHash = hash.hex();
visitedDomains[site] = siteHashes = {domainHash, incognitoHash};
await CachedStorage.save(this);
}
return siteHashes;
}
};
|