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tss/rsa: Adding verification of signature shares #453

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@armfazh armfazh commented Jul 19, 2023

This enables verification of signature shares, provided safe primes are used in the RSA key.

Reference: Protocol 1 of https://www.iacr.org/archive/eurocrypt2000/1807/18070209-new.pdf

Stacked on top of #451

@armfazh armfazh added the enhancement Improvement over something already in the project label Jul 19, 2023
@armfazh armfazh requested review from bwesterb and cjpatton July 19, 2023 00:51
@armfazh armfazh self-assigned this Jul 19, 2023
// they are not verifiable.
// This field is present only if the RSA private key is
// composed of two safe primes.
vk *VerifyKeys
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This should be added to the MarshalBinary/UnmarshalBinary functions https://github.com/cloudflare/circl/blob/tssRSAverif/tss/rsa/keyshare.go#L51

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to ease review, I will propose changes to the serialization functions in a different PR.

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