[zk-token-sdk] add pubkey proof #28392
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* add pubkey proof * add pubkey sigma proof * add docs for the sigma proof functions * add pod public key sigma proof * add public-key validity proof instruction * add public-key validity proof instruction * add VerifyPubkeyValidity instruction * cargo fmt (cherry picked from commit bc92709)
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Oct 14, 2022
[zk-token-sdk] add pubkey proof (#28392) * add pubkey proof * add pubkey sigma proof * add docs for the sigma proof functions * add pod public key sigma proof * add public-key validity proof instruction * add public-key validity proof instruction * add VerifyPubkeyValidity instruction * cargo fmt (cherry picked from commit bc92709) Co-authored-by: samkim-crypto <skim13@cs.stanford.edu>
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Problem
Currently there is no mechanism for a user of confidential tokens to prove the validity of an ElGamal public key.
Summary of Changes
Add a proof-of-knowledge public key validity proof instruction for the twisted ElGamal public key.