Show HN: Engye – transfer files between any two devices by scanning a QR code(engye.fuzzyworld.net)

8 pointsby psafronov9 hours ago1 comment

20after43 hours ago
This seems pretty useful. Just curious, why is it necessary to load entire files into memory (let alone twice?) - seems like not that much extra work (for claude) to stream the files to disk. Maybe I'm missing some limitation due to the underlying implementation. I agree that it's not necessarily a deal breaker for most common quick file transfers, however, it seems like unnecessarily limiting the scope of the tool if it wouldn't be too difficult to overcome.
- psafronov3 hours ago
  The need for loading the file into memory comes down to WebCrypto's AES-GCM being one-shot: crypto.subtle.encrypt calculates a single auth tag over the entire message and there's no incremental/update() API, so the whole file has to be one contiguous buffer.
  The fix is chunked AEAD (per-chunk IV+tag), encrypting/decrypting a chunk at a time. It's on the roadmap, just haven't gotten around to it yet: https://gitlab.com/PavelSafronov/engye#large-file-support-st...
  That feature is also a good opportunity to switch to FileSystemWritableFileStream/Blob for writes, which will reduce the memory requirements when writing files to disk.