How Can I Securely Store My Private Key for JWTs in Google App Engine?

Storing Private Key in Google App Engine

When utilizing JWTs on Google App Engine, accessing the private key becomes challenging due to the absence of filesystem access. This article explores two methods for storing the private key: static file storage within the application directory or leveraging the Datastore.

Static File Storage

If the private key does not require frequent updates, it can be stored as a static file within the app's root directory. This method allows for seamless integration with code that processes relative file paths.

To store the private key as a static file:

1. Place the key file in a folder within the app's root directory, e.g., "key/my_key.txt".
2. Configure app.yaml to map this file to a static URL pattern, e.g., "static_key /key/my_key.txt".

Datastore Storage

For keys that need to be updated dynamically, the Datastore provides a reliable storage mechanism.

To store the private key in the Datastore:

1. Create a new entity in the Datastore named "PrivateKey".
2. Set the "key" property to a unique identifier, e.g., "my_private_key".
3. Set the "value" property to the PEM-encoded private key.

Considerations

It is important to note that static files are not accessible to application code if they are not explicitly defined in app.yaml. Additionally, consider the security implications of storing sensitive keys in this manner.

By following these approaches, developers can effectively store their private keys in Google App Engine and utilize the benefits of JSON web tokens for authentication and authorization.

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