fix(crypto) fix setAAD undefined checks

[cirospaciari]

What does this PR do?

Fix: #18700

• Documentation or TypeScript types (it's okay to leave the rest blank in this case)
• Code changes

How did you verify your code works?

Test

[robobun]

^{Updated 1:41 PM PT - Apr 9th, 2025}

✅ @cirospaciari, your commit 162abbce40499d5000b3bfc0f7a5107c036ad025 passed in Build #14730! 🎉

---

🧪   try this PR locally:

bunx bun-pr 18905

[dylan-conway]

We should change the plaintextLength check to:

JSValue plaintextLengthValue = optionsValue.get(globalObject, Identifier::fromString(vm, "plaintextLength"_s));
RETURN_IF_EXCEPTION(scope, JSValue::encode({}));

if (!plaintextLengthValue.isUndefinedOrNull()) {
    std::optional<int32_t> maybePlaintextLength = plaintextLengthValue.tryGetAsInt32();
    if (!maybePlaintextLength || *maybePlaintextLength < 0) {
        return ERR::INVALID_ARG_VALUE(scope, globalObject, "options.plaintextLength"_s, plaintextLengthValue);
    }

    plaintextLength = *maybePlaintextLength;
}

This is the same conversion in new Cipher() for options.authTagLength. It's closer to value >>> 0 !== value in js

[dylan-conway]

Could also add a getUIntOption function that wraps this logic

[cirospaciari]

tryGetAsInt32

I think any other function todo the same would be basically result in the same amount of LOC that using tryGetAsInt32 so I just update to tryGetAsInt32