77 - ChatOS - Trying encryption libraries

Aug 4, 2023

100DaysOfCode ChatOS devlog

Livestream

Libraries

Themis https://www.cossacklabs.com/themis Github
- Bear app case study
TweetNaCl.js https://www.npmjs.com/package/tweetnacl
- https://tweetnacl.js.org/#/box

Resources

Keybase Book - Crypto Chat https://book.keybase.io/docs/chat/crypto
[Google Cloud - Security Key Management](https://cloud.google.com/security-key-management
Kerckhoffs’ Principle -

Key features to use on ChatOS:

Works on browser
User can choose any passphrase, long or short
End-to-end encryption (Firebase admin cannot decrypt the content)
Preferrably 1-key
Not too slow

Themis has wasm port - need to append ?url when imported. https://vitejs.dev/guide/features.html#webassembly

You can try at https://try-encryption-libs.vercel.app (Github: https://github.com/narze/try-encryption-libs)

Themis is very slow I dunno why…

Passphrase method use PBKDF2 with more than 100k iterations so it takes 2.5 seconds to encrypt, maybe I’ll find other libraries to convert passphrase to symmetric key separately.

Found out later that it’s 314110 rounds. 🫠