Viktor and Kurt,
Thanks for the help! Now it's working.
Qi
-----Original Message-----
From: openssl-users [mailto:
[hidden email]] On Behalf Of Kurt Roeckx
Sent: Wednesday, August 22, 2018 2:12 PM
To:
[hidden email]
Subject: Re: [openssl-users] using NULL ciphers
On Wed, Aug 22, 2018 at 02:08:42PM -0400, Viktor Dukhovni wrote:
>
>
> > On Aug 22, 2018, at 1:56 PM, Qi Zeng <
[hidden email]> wrote:
> >
> > I’m trying to use NULL cipher such as ECDHE-ECDSA-NULL-SHA for debugging purpose. With OpenSSL version 1.0.2p, I was able to make it work. However with version 1.1.0i or 1.1.1 prev 9, SSL_CTX_set_cipher_list(ctx, "ECDHE-ECDSA-NULL-SHA") succeeded but SSL_Connect () failed. Is there any way to enable NULL ciphers with version 1.1.0i or later?
>
> Yes, you need to use:
>
> "ECDHE-ECDSA-NULL-SHA:@SECLEVEL=0"
>
> at present there are no separate controls to distinguish between the
> authentication security level and the encryption security level, so
> this also removes floors on the keys used in the certificates, but
> for debugging that should not be an obstacle...
With 1.1.1 pre 9 you also might try to be using TLS 1.3, and that
does not support a NULL cipher.
Kurt
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