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ivokub
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Jan 20, 2023
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Looks good. I think you should copy input scalars to JointScalarMultiplication. In usual ScalarMul, you get the scalars from GLV decomposition and they are safe to modify locally. For ECDSA it is safe as you create big.Int inputs freshly, but if anyone would use JointScalarMul separately, then it would mutate its inputs.
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To record conversation - maybe it is better to use fr.Element in Signature and PrivateKey types.
Also, it seems params type isn't strictly necessary - we have all the information in the curve template anyway. And add add signature/ecdsa package which calls the actual implementation depending on the curve.
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Adds ECDSA scheme using gnark-crypto primitives on all curves. This follows "crypto/ecdsa", FIPS 186-4 and SEC1 v2.
todos:
fr.Inverse()instead ofbigInt.ModInverse()(experimented speedup is just ~1-2% so need to dig more why)[a]P + [b]Qfor fast verification (might also look into JSF encoding of scalars if perf is critical)