This is just like read_credential() but also looks into the encrypted credential directory, not just the regular one. Normally, we decrypt credentials at the moment we pass them to services. From service PoV all credentials are hence decrypted credentials. However, when we want to access credentials in a generator this logic does not apply: here we have the regular and the encrypted credentials directory. So far we didn't attempt to make use of credentials in generators hence. Let's address and add helper that looks into both directories, and talks to the TPM if necessary to decrypt the credentials.
System and Service Manager
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