AlgorithmId is a pure data type including an OID and some optional parameter bytes. Putting an AlgorithmParameters object there means every time an AlgorithmId is parsed, the AlgorithmParameters::getInstance method is called even if most OIDs do not have accompanying AlgorithmParameters implementations. We can only store encodedParams and move any possible AlgorithmParameters initialization to the callers.

We can also try to find a better solution to the NULL params.