secp521r1 removed from 1.4.6

nginxu14 nginx-forum at
Fri Mar 14 22:23:05 UTC 2014

Maxim Dounin Wrote:
> Hello!
> On Thu, Mar 13, 2014 at 03:04:11PM -0400, nginxu14 wrote:
> > Sorry for wasting your time you are correct secp512r1 isnt there
> when I run
> > the command.
> > 
> > Im guessing that secp256r1 isnt in the list because its just the
> default
> > one. Just using the default settings and not setting a curve uses
> secp256r1
> > and secp384r1 works by setting it in ssl_ecdh_curve.
> Secp256r1 and prime256v1 are just different names of the same 
> curve.  (And yes, it's used by default.)
> > I like CentOS its the only OS I use for servers but this kind of
> thing
> > annoys me about CentOS because its waiting for Red Hat to enable
> secp521r1.
> > I dont have the need for it but it would be nice to have the option.
> 256 bit ECC is believed to be equivalent to 3096 bit RSA, and 521 
> bit ECC - to 16384 bit RSA.  So in case of https, unless you are 
> using 16384 bit RSA certificates, use of secp521r1 is mostly 
> pointless and just wastes CPU cycles.
> > Looking at this:
> it
> > is coming but not sure when.
> Note well that this link correctly points out that secp521r1 isn't 
> supported by IE (yet?), so it's use isn't a good idea from 
> compatibility point of view, too.
> -- 
> Maxim Dounin
> _______________________________________________
> nginx mailing list
> nginx at

For me its just about having the option. I know secp521r1 is coming from Red
Hat. In the same link a member of staff says they got the go ahead from
Legal. I read somewhere the problem is because its patented and Red Hat dont
want to risk it. Hopefully in the next few months its enabled/added.

Posted at Nginx Forum:,248325,248402#msg-248402

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