How to access encryption keys for arithmetic?

[tremblerz]

Describe the feature
Essentially I am trying to perform addition on two secret keys and I want to use the resulting key as a secret key for another Pyfhel object that generates a public key based on this secret key.
So there are two requirements -

1. API to get poly coeff. for the keys (support for arithmetic would be helpful as well)
2. keyGen() with a support to use the existing secret key? (I am guessing it might be there already with the current keygen api if I load using from_bytes_secret_key)

Is this feature related to a project/objective? Please describe briefly
I am working on a project that requires Homomorphic secret sharing and the above requirement should be enough I believe for doing everything else to simulate HSS functionality.

Let me know what you think

[ibarrond]

Interesting feature! I see no problem to go through with it

[ibarrond]

@tremblerz I'm a bit busy these months. If you are interested in having this feature in Pyfhel, I can guide you towards implementing it.