On Fri, Sep 25, 2020 at 3:01 PM Anatol Pomozov <anatol.pomo...@gmail.com>
wrote:
> Or more precisely it calls this code
https://boringssl.googlesource.com/boringssl/+/master/crypto/fipsmodule/ec/felem.c#57
>
> But I want to avoid implementing parts of EC encryption myself and
looking for a standard Golang way to achieve my goal.
>
> Shouldn't this inversion operation be part of the standard library?
>
My understanding is that the Go standard library prefers that the entire
underlying logic of ECC should be hidden from the user, like in
"crypto/ed25519".
However, they can't get rid of elliptic.CryptoParams due to compatibility.
It's not a good idea in a general sense to use CryptoParams because it uses
big.Int which is not side-channel resistant. For these reasons I don't
think it's likely they'all add point inversion.
If you do want to go on... you can "invert" a point ("negate" would be a
better term...) by simply setting y = n - y, for example:
y := new(big.Int).Sub(curveParams.Params().N, y)
Best regards,
Conrado
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