Hi @CACUser!

Thank you for reporting, that looks interesting :)
I suspect some issues with data size / memory management in wasm wrapper. We will investigate.

Do you see this error every time on any data larger than 48000 bytes? Or does this data have some special symbols inside?

Runs perfectly well on Chrome on macOS.

even with data above 48000 bytes?

Apologies - I now think it does not have anything to do with size. It is occurring intermittently with smaller sizes too. There are no special symbols inside. I am adding a bunch of messages to an indexedDB, encrypting the DB, storing in localStorage, then later decrypting the DB (this is where the issue is occurring on Safari on macOS and iOS). It works without any issues with any data size on Chrome on macOS.

Thank you @CACUser! We will investigate this.

It will help a lot if you could send us a test project that reproduces the issue.

Also, we're in the middle of migrating to typescript for WASM themis #792, I'm wondering if this might help..

cc @ilammy

Also, we're in the middle of migrating to typescript for WASM themis #792, I'm wondering if this might help..

Probably it wont as I did not really discover any implementation bugs while converting to ts.

FWIW, I've been testing recently added WasmThemis example with recently released wasm-themis@0.13.10 with Safari 14.0.3 as well, and it works fine for me. So it does not seem to be failing in isolation.

i think this one is addressed by #928 and https://github.com/cossacklabs/themis/releases/tag/0.14.8

@CACUser, please take a look, if you are still interested. You may update wasm-themis to the latest at the moment 0.14.8.

I have checked twice with different browsers the issue with the code from https://github.com/radetsky/create-react-app-with-themis/tree/big_files_encryption_test

It works fine even with 20 MB of data.