[openssl-users] X25519 not listed in ecparam -list_curves

Blumenthal, Uri - 0553 - MITLL uri at ll.mit.edu
Mon Nov 14 20:07:38 UTC 2016

As "-list-curves" is not supposed to work here, what would be a good way to tell if a given installation supports X25519?

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  Original Message  
From: Dr. Stephen Henson
Sent: Monday, November 14, 2016 15:02
To: openssl-users at openssl.org
Reply To: openssl-users at openssl.org
Subject: Re: [openssl-users] X25519 not listed in ecparam -list_curves
On Fri, Nov 04, 2016, Viktor J?gersk?pper wrote:

> Hi,
> OpenSSL 1.1.0 implemented X25519. "openssl s_client -cipher kEECDH
> -curves X25519 -connect google.com:443" works as expected, and I get
> "Server Temp Key: X25519, 253 bits". But X25519 is not listed in the
> output of "openssl ecparam -list_curves" in version 1.1.0b (I use
> 1.1.0b-2 from Debian). Should it be listed there anyway?
The ecparam operation lists curves supported by the EC* API. The X25519 curve
(for various reasons defined in the standards) is treated as a distinct
algorithm so it is not listed by ecparam.

Dr Stephen N. Henson. OpenSSL project core developer.
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