Failed to lookup symbol 'RSABridgeCall': dlsym(RTLD_DEFAULT, RSABridgeCall): symbol not found

[215ly]

When I use the Flutter project to sign the plugin for example:

RSA.signPKCS1v15bytes (signData, fastRsa. Hash.SHA256, pemPrivate Key)

The following error message appears

Failed to lookup symbol 'RSABridgeCall': dlsym(RTLD_DEFAULT, RSABridgeCall): symbol not found

This error only occurs on the IOS platform and does not occur on the Android platform

• Xcode version：15.3
• IOS version: eighteen point three
• fluter version：3.19.6
• fast_rsa: ^3.6.6

I am wondering if the conflict occurred due to the introduction of other plugins?

If you have any response, I would greatly appreciate it

[dustinkerstein]

I'm seeing the same issue when building with FlutterFlow:

[ERROR:flutter/runtime/dart_vm_initializer.cc(40)] Unhandled Exception: Invalid argument(s): Failed to lookup symbol 'RSABridgeCall': dlsym(RTLD_DEFAULT, RSABridgeCall): symbol not found

[Arley011]

Same on 3.8.3. It looks like this happens only for iOS:

Invalid argument(s): Failed to lookup symbol 'RSABridgeCall': dlsym(RTLD_DEFAULT, RSABridgeCall): symbol not found
#0      DynamicLibrary.lookup (dart:ffi-patch/ffi_dynamic_library_patch.dart:33)
#1      Binding._library= (package:fast_rsa/bridge/binding.dart)
#2      new Binding._internal (package:fast_rsa/bridge/binding.dart:29)
#3      Binding._instance (package:fast_rsa/bridge/binding.dart:18)
#4      RSABridge.bindingEnabled (package:fast_rsa/fast_rsa_bridge.dart)
#5      RSABridge.call (package:fast_rsa/fast_rsa_bridge.dart)
#6      RSA.decryptPrivateKey (package:fast_rsa/fast_rsa.dart:160)

It was reproduced by one of our testers on his iOS device. However, I was not able to reproduce with the same private key and password on my device and on the Simulator.

This is not happening on version 3.6.3.

UPDATE: I was able to reproduce when building the app for iOS in release mode on 3.8.3. Version 3.8.2 doesn't have this problem

[iosephmagno]

Yes, we had to downgrade for this issue.

[trauma-and-drama]

Hi everyone,

so after some digging, it seems the code gets stripped away, as of missing a reference in code (it is only called via dlsym reflection).

There are thre options, two of them as workaround, from least favourable to desired:

1. Option: in Target 'Runner'/Build Settings/Linkage - General/Dead Code Stripping
   Change YES to NO
   Unfavourable

2. Option: Create an m.file with

//
//  keeprsa.m
//  Runner
//
//  Created by trauma-and-drama on 15.05.2025.
//
#import <RSABridge/librsa_bridge.h>

// Trick to prevent RSABridgeCall from being stripped in release mode
__attribute__((used)) static void _keep_RSABridgeCall() {
    RSABridgeCall(NULL, NULL, 0);
}

Mind the attribute __attribute__((used)) which prevents stripping. No further reference required, just put it in your Runner folder, where appDelegate.swift is located.

3. Option: and most favorable: RSABridgeCall the pod needs to be updated with that attribute to prevent stripping.

Hope that helped. It was the only solution that helped me regardless of version.

[jerson]

Hi @trauma-and-drama thanks for sharing this, I'm going to include it in the next version to prevent stripping

[trauma-and-drama]

Dear @jerson ,

I had no luck making my proposal work in Testflight, while it only worked in local release.

It seems like the Appstore processing strips away like a mofo. Even though having a mock call in swift in the AppDelegate _ = RSABridge.RSAEncodeText(nil, nil) did not help.

The only thing that helped was the first option.

Strip linked Product = NO
Strip Style NonGlobalSymbols
Dead Code Stripping = false

Not sure what is happening.

[yanmingLiu]

fast_rsa: ^3.6.6

When using flutter run --debug Everything is OK

When using flutter run --profile
catch： Invalid argument(s): Failed to lookup symbol 'RSABridgeCall': dlsym(RTLD_DEFAULT, RSABridgeCall): symbol not found.

[jerson]

I just released a new version fixing the Failed to lookup symbol 'RSABridgeCall' in profile mode
please take a look https://pub.dev/packages/fast_rsa/versions/3.8.4