@openvtc/vti-rooms-wasm

A data room's member half for the browser, compiled from the vti-rooms-wasm crate: MLS group custody, record sealing, the epoch key chain, and room files (FileSealer / FileOpener), running the same code as the VTA, the CLI and the hosts' conformance tests.

Built with wasm-bindgen --target bundler, for a bundler that imports WebAssembly as ESM (Vite with vite-plugin-wasm, webpack 5 with asyncWebAssembly).

Room files and their keys

FileSealer.withKey and FileOpener.withKey take one file's key, released by the member's VTA (rooms/keys/file-key/0.1). Call them only in a context that is yours and not a web page's — a wallet extension's offscreen document or service worker. A file key never expires: a page that held one would hold that file's ciphertext open forever, and on a public store such as Walrus that ciphertext is public forever.

What FileOpener.push returns is provisional. Release plaintext (save it, render it, hand it on) only once finish() has returned and verified is true; on any error, discard what was written.

The design is docs/05-design-notes/data-rooms-files.md §3–4 in the repository.

Building

scripts/build-rooms-wasm-npm.sh in the repository builds this package. It needs the wasm-bindgen CLI at the version Cargo.lock pins.