Скачать или смотреть Fixing the Firebase SMS Verification Error: SHA Key Issues Explained

Learn how to troubleshoot Firebase SMS verification errors in your Flutter app by understanding SHA key configurations and package names.
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Troubleshooting Firebase SMS Verification Errors in Flutter

If you're a Flutter developer working with Firebase for SMS verification, encountering an error message like "A safety_net_token was passed, but no matching SHA-256 was registered in the Firebase console" can be quite frustrating. This problem typically arises when your app's package name and SHA key configurations do not align with the information registered in the Firebase Console. In this guide, we'll explore this issue in detail and guide you through the solution step by step.

Understanding the Problem: What Causes the Error?

The error message indicates that Firebase is unable to authenticate your application due to mismatched security identifiers. When you set up Firebase for your Flutter app, you must register specific details to ensure proper functionality:

Package Name: This is a unique identifier for your application as defined in your pubspec.yaml file.

SHA-1 and SHA-256 Keys: These cryptographic keys ensure that requests to Firebase are coming from your application and not from an unauthorized source.

If either the package name or the SHA keys in the Firebase Console do not match those of your application, you will encounter the errors preventing SMS verification, even when other functionalities appear to work correctly.

Common Error Messages

"SMS verification code request failed: unknown status code: 17028"

"This app is not authorized to use Firebase Authentication."

Steps to Resolve the Issue

Now that we understand the cause of the error, let's dive into the solution. Here’s a step-by-step guide to resolving the SHA key mismatch and restoring SMS verification functionality in your Flutter app.

Step 1: Verify Your Package Name

First, check the package name of your Flutter application. This can be found in your app’s pubspec.yaml file:

[[See Video to Reveal this Text or Code Snippet]]

Make sure that this is the same as the package name registered in the Firebase Console.

Step 2: Add Correct SHA Keys

Next, you'll need to gather and add the correct SHA key(s) for your application. Here’s how to do it:

Retrieve SHA-1 and SHA-256 Keys:

For your app's debug version, you can obtain the SHA keys by running the following command in your terminal (replace <your-key> with your actual key name):

[[See Video to Reveal this Text or Code Snippet]]

For your release version, make sure you have the release SHA keys generated.

Add the Keys to Firebase Console:

Navigate to your Firebase project and select Project settings.

In the General tab, scroll down to the Your apps section.

Under your app, click on the Add Fingerprint button, and enter the SHA-1 and SHA-256 keys.

Step 3: Re-Authenticate Your App with Firebase

If you’ve changed the package name or made any changes to the SHA keys, you may need to uninstall the app from your device or emulator. This ensures that the new configurations take effect.

Uninstall Your App: Remove the app from the device or emulator.

Reinstall the App: Reinstall the app, making sure to fetch the latest configurations that correspond with Firebase.

Step 4: Test SMS Verification Again

Once you have updated the SHA keys and reinstalled the app, try to send an SMS verification code again. With the correct configurations in place, your app should successfully interact with Firebase for authentication purposes.

Conclusion

Firebase authentication integration can sometimes be tricky, specifically when it comes to aligning your package name and SHA keys. If you encounter the SMS verification error, follow these steps to verify your configuration. Oftentimes, a simple mismatch is the culprit, and correcting it can restore full functionality to your app's authentica