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 WebAssembly.
- Related to #14544 (closed)