Speed up the checksum computation in the verification extension
- Back in 2015, DAVE used to rely on a native call (`nsICryptoHash`) which is not
available anymore to WebExtensions. It was so fast that we never felt
the need to measure how many seconds it took; probably less than 5.
- The WebExtension relies on the Forge library and takes 45
seconds on a Core i5 M520, around 10 times more.
Asking upstream a new API for checksum calculation sounds hard as it
would require lobbying both Mozilla and Chrome. An alternative could be
to rewrite the checksum calculation in
#2 Updated by intrigeri about 2 months ago
An alternative could be to rewrite the checksum calculation in [WebAssembly](https://developer.mozilla.org/en-US/docs/WebAssembly).
Note that WebAssembly is currently disabled in Tor Browser, until it has been properly audited: https://trac.torproject.org/projects/tor/ticket/19417.