🐛 Key with empty bytes vs importKey

[bjutkoski]

What's happening?

crypto.subtle.generateKey sometimes returns a key with empty bytes like:

Exported key:
[248, 21, 138, 140, 37, 183, 146, 130, 28, 75, 183, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

if I import the exported key it doesn't work when trying to decrypt:
[Error: error in DoCipher, status: 2]

The issue also happens if I create a key and import it:

(Run it in a loop and it will happen at some point)

const key = crypto.randomBytes(32);
const importedKey = await crypto.subtle.importKey('raw', random, 'AES-CBC', true, ['encrypt', 'decrypt']);
const exportedKey = await crypto.subtle.exportKey('raw', importedKey);

exportedKey !== key (where exportedKey has empty bytes)

Reproducible Code

const test = async () => {
  while (true) {
    try {
      const bytes = crypto.getRandomValues(new Uint8Array(16)).slice().buffer;
      const key = await crypto.subtle.generateKey({ name: 'AES-CBC', length: 256 }, true, ['encrypt', 'decrypt']);
      const exportedKey = await crypto.subtle.exportKey('raw', key);
      console.log('exportedKey', new Uint8Array(exportedKey));
      const iv = crypto.getRandomValues(new Uint8Array(16)).slice().buffer;
      const encryptedBytes = await crypto.subtle.encrypt({ name: 'AES-CBC', iv }, key, bytes);
      const importedBytes = await crypto.subtle.importKey('raw', exportedKey, 'AES-CBC', true, ['encrypt', 'decrypt']);
      const decryptedBytes = await crypto.subtle.decrypt({ name: 'AES-CBC', iv }, importedBytes, encryptedBytes);

      console.log('decrypted');
    } catch (error) {
      console.error('error', error);
    }
  }
};

test();

Relevant log output

(NOBRIDGE) LOG  exportedKey [139, 104, 250, 170, 146, 5, 138, 209, 222, 67, 13, 12, 38, 235, 208, 183, 121, 249, 135, 188, 235, 187, 98, 126, 229, 170, 0, 0, 0, 0, 0, 0]
 (NOBRIDGE) ERROR  error [Error: error in DoCipher, status: 2]

Device

iPhone 14 Pro (18.1)

QuickCrypto Version

0.7.12

Can you reproduce this issue in the QuickCrypto Example app?

I didn't try (⚠️ your issue might get ignored & closed if you don't try this)

Additional information

• I am using Expo
• I have read the Troubleshooting Guide
• I agree to follow this project's Code of Conduct
• I searched for similar issues in this repository and found none.