session_hash.js File Reference

A cache for session and domain hashes, used for Farbling. More...

Variables
var	Hashes

Detailed Description

A cache for session and domain hashes, used for Farbling.

Author

Copyright (C) 2021 Matus Svancar

Copyright (C) 2021 Giorgio Maone

License:

SPDX-License-Identifier: GPL-3.0-or-later

Variable Documentation

Hashes

var Hashes

Initial value:

= {
  sessionHash : gen_random64().toString(),
  visitedDomains : {},
  getFor(url){
    let site = getSiteForURL(url);
    let domainHash = this.visitedDomains[site];
    if (!domainHash) {
      let hmac = sha256.hmac.create(this.sessionHash);
      hmac.update(site);
      domainHash = hmac.hex();
      this.visitedDomains[site] = domainHash;
    }
    return {
      domainHash
    };
  }
}

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