v1.9.0 throws "unordered_map::at: key not found" error

[landabaso]

When executing version v1.9.0 of the library, an exception is thrown at this line: global.expo.modules.ExpoCrypto.getRandomValues(array).

Here's the full error log:

ERROR  Error: Exception in HostFunction: unordered_map::at: key not found, js engine: hermes

I am utilizing this package alongside randombytes.

The array variable, which originates from randombytes, is initialized at this location.

Additional context that might be helpful:

• I'm running the app on an iOS simulator using the command: npx expo start -c.

• Buffer support was added with: npm install buffer.

  And it's being shimmed in the following manner:

  import { Buffer } from "buffer";
  global.Buffer = Buffer;

For further clarity, I've tracked the function call in version v1.8.0, and it ultimately leads to global.ExpoModules.ExpoRandom.getRandomBase64String(byteLength);, which runs without any hitches.

For now, I've reverted to using v1.8.0. Appreciate the efforts behind this library, and I hope this information aids in resolving the issue.

[LinusU]

Thank you for taking the time to investigate and report!

Are you able to reproduce this if you just run the following lines, without this library at all?

const array = new Uint8Array(10)
global.expo.modules.ExpoCrypto.getRandomValues(array)

and do you get the same error if you import getRandomValues from expo-crypto and call that directly?

Also, which version of Expo are you using? and does the same error happen even if you remove your global Buffer polyfill?

[Mastaleru]

Example to reproduce this issue:
repo: https://github.com/Mastaleru/rn-learn/tree/625f9d2791442e622f85c4d46cb1e9317c2bbfee/first_project
package.json

  "dependencies": {
    "expo": "~49.0.13",
    "expo-status-bar": "~1.6.0",
    "react": "18.2.0",
    "react-native": "0.72.5",
    "react-native-get-random-values": "^1.9.0"
  },
  "devDependencies": {
    "@babel/core": "^7.20.0"
  },

More context:

• It works on Android, fails on iOS.
• I'm using in conjunction with a browserified lib that does not have support for crypto.getRandomValues

[CarlosVilasAlvarez]

Same behaviour, after v1.9.0 it crashes using expo v49 with realm-js (which needs this polyfill to run safely).

[gvanderclay]

This is still occurring on v1.11.0 with expo 51 and realm 12.