[Cryptography-dev] ECPrivateKey form private_value

[Alex Gaynor]

Perhaps an EllipticCurvePrivateNumbers.from_private_number_and_curve()
would be appropriate to automatically compute the public key?

Alex

On Thu, May 14, 2015 at 12:11 PM, Paul Kehrer <paul.l.kehrer at gmail.com>
wrote:

> Hi Dario,
>
> The creation of an EllipticCurvePrivateNumbers object does require you to
> do d*G yourself at this time. There is some precedent for us adding
> functions to compute other elements (see:
> https://cryptography.io/en/latest/hazmat/primitives/asymmetric/rsa/#handling-partial-rsa-private-keys)
> so a function to do this makes sense to me.
>
> -Paul
>
> On May 14, 2015 at 3:21:29 AM, Dario Sneidermanis (dariosn at gmail.com)
> wrote:
>
>  Hi,
>
> I'm trying to compute an EllipticCurvePrivateKey from a private_value (d).
> It seems that the only way to achieve this is to create an
> EllipticCurvePrivateNumbers object, but the constructor takes both the
> private_value and the public_numbers.
>
> Why does it need the public_numbers, when it could compute them (knowing
> the curve), by doing d*G (G being the curve generator)?
>
> Is there any way to go from d to the ECPrivKey without doing d*G by myself?
>
> Thanks,
> Dario
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