Secure PKS tokens stored on the Drupal site

Problem/motivation

I want secure tokens to be stored on the Drupal site so that I cannot see or fetch the keys manually, ensuring the security of sensitive information.

• The system should use key_value_expire to store keys from the response provided by PKS or environment variables as an encrypted hash. The goal is that when a database is moved from environment to environment, the keys are invalidated due to missing the JWT hash, used to encrypt the data.
• The key module must have methods that first attempt to fetch data from the cache when using the 'acquia' provider.
• If no values are found in the cache, the system must attempt to fetch the data from the key service.
• The stored tokens must be inaccessible to site administrators in plain text format.
• If no value is found in PKS, attempt to fetch the value(s) from the environment variable, based on the module’s machine name.