@Override
    protected String engineToString() {
        return "Conscrypt OAEP AlgorithmParameters";
    }
Writes an ASN.1 AlgorithmIdentifier structure into container, which looks like
<pre>
SEQUENCE
  OBJECT IDENTIFIER
  PARAMS (based on the particular algorithm)
</pre>
This method returns a reference to the sequence such that the params may be added to it.
The reference needs to be freed with asn1_write_free once it's used.
common/src/main/java/org/conscrypt/OAEPParameters.java