EVP_PKEY_CTX* Best Practices

[Christian Mazakas]

I'm relatively new to the world of OpenSSL.

I'm trying to write a QUIC stream class and for that, I need to use the
EVP_PKEY_CTX and I'm not sure what's the optimal way of scoping instances
of this context.

For example, should I have a CTX per Quic connection? Or rather one that's
shared by many in a thread-safe manner? What's the cost of generating one
per connection? Are there docs where I can read about this kind of stuff?

- Chris
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