Hacker News Reader

What about their signal integration? https://signal.org/blog/whatsapp-complete/

The open protocol variant of that is called OMEMO. Same double ratchet and implemented using Signal's library (the same as used by WhatsApp) in many XMPP clients

> the same as used by WhatsApp

source? wouldn't that be a license violation?

WhatsApp paid WhisperSystems (the previous Signal company) for a commercial license. Same as Google. Dual-licensing their encryption protocol library was their main source of income back then.

AFAIK, even today you can fetch the WhatsApp Android apk, extract the zip and do a `strings classes*.dex | grep signal` to find class and package names matching the sources in the signal-protocol-java repository in the Signal GitHub.

Reply on news.ycombinator.com