Can we use less space for RSA onion keys on clients?

Our heap profiles say that we're using a HUGE amount of storage for RSA onion keys. That's pretty sad, considering that we only use them for legacy v2 hidden service stuff.

Maybe we can only parse them on-demand, when we need them?

Maybe (if the openssl format is much more expensive than the raw asn1) we can store them in asn1, and only convert them to EVP_PKEY objects when we need them?

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