[Cryptography-dev] accessing elliptic curve domain parameters (a/b/p/etc)

[Paul Kehrer]

Hi Matt,

There are multiple issue/pull requests for this but unfortunately GitHub is down at the moment so I can't look them up... Once GitHub is back up and running take a look at https://github.com/pyca/cryptography/pull/2476 (that PR might have been split into other PRs that we've been discussing, but hopefully we've cross linked them)

Please weigh in on that as knowing all the potential consumers helps us decide whether the increase in API surface area is worthwhile.

-Paul Kehrer (reaperhulk)
On January 27, 2016 at 7:34:28 PM, Matt Bullock (matt.s.b.42 at gmail.com) wrote:

For a project I am working on, I have a need to encode/decode elliptic curve points using point compression[1].  As this is not yet supported natively by the cryptography library, I have started implementing it myself but have hit a snag.  Unlike the uncompressed point encoding, in order to decode a compressed curve point I need to be able to reference the curve parameters.  I have been searching through the cryptography documentation and code but cannot find any way of retrieving these values from the backend.

Is there a method for this that I am missing, or is this functionality not yet available?

thanks
   --Matt

[1] 2.3.3/2.3.4 http://www.secg.org/sec1-v2.pdf

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