feat(crypto): CRP-2596 create VetKdProtocol trait #2569
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randombit
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Introduce a `VetKdProtocol` trait and implement it for `CryptoReturningOk`. The trait is designed so that underneath we can implement the cryptographic protocol specified in the π<sub>vetbls-agg2</sub> scheme specified in section 5.3 of the [vetKeys research paper](https://eprint.iacr.org/2023/616.pdf), in its _optimistic_ variant, where the meaning of optimistic is described in section 9 of the research paper. The π<sub>vetbls-agg2</sub> scheme is implemented in [ic-crypto-internal-bls12-381-vetkd](https://github.com/dfinity/ic/blob/master/rs/crypto/internal/crypto_lib/bls12_381/vetkd/src/lib.rs).
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Introduce a
VetKdProtocoltrait and implement it forCryptoReturningOk.The trait is designed so that underneath we can implement the cryptographic protocol specified in the πvetbls-agg2 scheme specified in section 5.3 of the vetKeys research paper, in its optimistic variant, where the meaning of optimistic is described in section 9 of the research paper. The πvetbls-agg2 scheme is implemented in ic-crypto-internal-bls12-381-vetkd.