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feat(adkg/acss): distribute both feldman & pedersen shares - #255
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In the previous iteration of the HTADKG, I had mistakenly removed the Feldman verifiable secret share, replacing it entirely by Pedersen VSS shares.
This was a mistake as it rendered the ECDH coin toss impossible. We needed proper ECDH keys in the form$X = xG$ for the protocol to succeed, which was impossible to obtain using Pedersen's polynomial commitments.
This PR adds back a Feldman share to the ACSS. We now execute 1 Feldman VSS, and 1 Pedersen VSS in the case of the standard ADKG, and 1 Feldman + 2 Pedersens for the high-threshold variant, instead of using only Pedersen shares.
I hadn't noticed that earlier since the coin toss is only executed during disagreements on the set of shares to use, which was less likely to occur due to the ABA bug in #254.