getRandomValue in js

[jkb77]

I build this simple code:
https://github.com/jkb77/test_js

using emcc :
emcc test.cpp -I <path_to libsodium-js-sumo>/include -L /lib/ -lsodium

and I get 2 files:

• a.out.js
• a.out.wasm

when I try to:
node a.out.js

I get:
/home/jakub/test/a.out.js:146
throw ex;
^

TypeError: Module.getRandomValue is not a function
at 14508 (/home/jakub/test/a.out.js:1704:36)
at _emscripten_asm_const_int (/home/jakub/test/a.out.js:1843:31)
at wasm-function[52]:0x1fb9
at wasm-function[53]:0x1fdd
at wasm-function[13]:0xdc7
at wasm-function[51]:0x1f8f
at /home/jakub/test/a.out.js:1523:22
at callMain (/home/jakub/test/a.out.js:5124:15)
at doRun (/home/jakub/test/a.out.js:5181:23)
at run (/home/jakub/test/a.out.js:5196:5)

node version is v12.22.5

I built libsodium:
https://github.com/jedisct1/libsodium
git clone https://github.com/jedisct1/libsodium --branch stable
cd libsodium
cp dist-build/emscripten.sh ~/libsodium/
./emscripten.sh --sumo

[jedisct1]

Hi,

Can you clarify what you are trying to do? (not how, but the eventual goal)

In order to compile for the emscripten environment, after cloning the repository, you can do:

./dist-build/emscripten.sh --sumo

Then you get a WebAssembly module that can be called from Javascript, as done in libsodium.js.

I don't think you can just link emscripten generated modules like that, especially since instantiating the library requires waiting for a Javascript promise to complete.

If you want to throw code written in C/C++ and link everything as a standalone module for Node, a better way is probably to compile for WASI. You get a regular library that you can link C/C++/Zig/Rust/etc. code to in order to build an application. node may need the --experimental-wasi-unstable-preview1 to enable WASI, though.

[jkb77]

Hi,

I solved the problem. I added to the cpp code: sodium_init() .

Thanks and I am sorry for my mistake.