[Cryptography-dev] Using EC Point arithemtic in cryptography

[Alex Gaynor]

Hi John,

We don't have an API for doing raw EC point arithmetic.
https://github.com/pyca/cryptography/pull/2919 is an issue proposing (and
implementing) it, but I've been very hesitant to expand the API like this.

Point multiplication can be accomplished with the ECDH API.

Alex

On Fri, Dec 1, 2017 at 2:47 PM, John Pacific <me at johnpacific.com> wrote:

> Hey, folks!
>
> I'm working on prototyping this cryptosystem using cryptography. I'm
> porting it from Charm-crypto in Python to this.
>
> Charm crypto overrides some operators to perform scalar multiplication and
> modular inverses -- ie: `*` and `~`. When these operators are used with an
> EC element, it performs the overriden operation.
>
> I am now in the need to perform some similar operations within the context
> of cryptography.io and I can't seem to find a great way to do this.
>
> I can access some OpenSSL functions like `EC_POINT_mul` and
> `BN_mod_inverse` via `default_backend()._lib.EC_POINT_mul`, etc but I
> can't find any documentation of how this is used within the context of
> cryptography.io.
>
> Do any of you wonderful folks have any pointers on this or maybe how to
> perform some point arithmetic with the cryptography objects?
>
>
> Thanks,
>
> tux
>
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