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[SOLVED] OpenSSL Error: error:100AE081:elliptic curve routines:EC_GROUP_new_by_curve_name:unknown group

Posted: 2018/02/09 18:53:12
by delecolj
Hi,

I get this error. I have a fresh minimal install of Centos 7 with openssl.
kernel Linux 3.10.0-693.17.1

I have updated all the packages but I have this error coming when i am trying to test some encryption scripts:
OpenSSL Error: error:100AE081:elliptic curve routines:EC_GROUP_new_by_curve_name:unknown group

I have seen that there is quite a few people since Centos 6 with this issue but I have not since a solution for it.

Anyone is able to give some ideas?

Thanks in advance

Re: OpenSSL Error: error:100AE081:elliptic curve routines:EC_GROUP_new_by_curve_name:unknown group

Posted: 2018/02/09 20:06:15
by TrevorH
Redhat don't support all possible ciphers in openssl and disable some at build time due to licensing/patent concerns.

Re: OpenSSL Error: error:100AE081:elliptic curve routines:EC_GROUP_new_by_curve_name:unknown group

Posted: 2018/02/09 20:12:58
by delecolj
Thanks is there a list of such ciphers not supported?

Re: OpenSSL Error: error:100AE081:elliptic curve routines:EC_GROUP_new_by_curve_name:unknown group

Posted: 2018/02/09 20:27:22
by TrevorH
Don't know but it has a command to tell you the opposite: openssl list-cipher-algorithms

Re: OpenSSL Error: error:100AE081:elliptic curve routines:EC_GROUP_new_by_curve_name:unknown group

Posted: 2018/02/09 20:48:57
by delecolj
ok, thanks a lot.

Re: [SOLVED] OpenSSL Error: error:100AE081:elliptic curve routines:EC_GROUP_new_by_curve_name:unknown group

Posted: 2018/02/09 22:58:23
by avij
openssl ecparam -list_curves may also be informative.