Create a prototype script to create CRLite "list"/file for shavar to serve

[groovecoder]

CRLite is:

a system for proactively pushing all TLS certificate revocations to clients on a regular basis using efficient, compressed data structures

- CRLite Implementors Guide
(Full research paper)

As part of Firefox's implementation, we need:

Server-side code to scrape CT, CRLs and produce bloom filters
Create or update a service to distribute CRLite state to users
Get the bloom filter update service running automatically by infrastructure folks

- Firefox Product Requirements Document

Since shavar aligns closely with these requirements already ... we will create a prototype shavar-list-creation script to scrape CT, CRLs, and produce bloom filters. There are some pre-existing scripts for inspiration:

• certificate-revocation-analysis
• A simple filter cascade implementation in python (using the pybloom library)

Ideally, this script can run right alongside lists2safebrowsing.py as a Jenkins job that uploads the resulting file(s) to S3 for shavar to distribute.

I'm sure there will be some implementation changes & challenges, but we'll start with this first best effort.