See :issue:`84407`
All methods related to AJAX requests in :php:`\TYPO3\CMS\Rsaauth\RsaEncryptionEncoder` have been deprecated:
The rsa_publickey
AJAX route has been adapted to use the
:php:`\TYPO3\CMS\Rsaauth\Controller\RsaPublicKeyGenerationController` which was already used for
RSA key retrieval via eID in the frontend.
Calling the above method on an instance of :php:`RsaEncryptionEncoder` will throw a deprecation warning in v9 and a PHP fatal in v10.
All extensions that call the deprecated method are affected.
Extensions should use the AJAX route rsa_publickey instead of the deprecated method.
.. index:: Backend, Frontend, PHP-API, FullyScanned